The purpose of the present invention is to stably provide: a molten Al-Zn-plated steel sheet which exhibits excellent bending workability and corrosion resistance in a bent part; and a method for producing same. In order to achieve the foregoing, the present invention is a molten Al-Zn-plated steel sheet which comprises: a plating film having a composition which contains 45-65 mass% of Al and 1.0-3.0 mass% of Si, with the remainder comprising Zn, Fe and unavoidable impurities; and an interfacial alloy layer which is formed on the side of the plating film that serves as an interface with a base steel sheet and contains Fe, Al, Si, Zn and unavoidable impurities. The molten Al-Zn-plated steel sheet is characterized in that: the plating film has dendrites comprising mainly Al primary crystals and dendrite spaces containing Al-Zn eutectic crystals; the Al primary crystals contain an α-Al phase matrix and Zn precipitates; the Zn content in the matrix is 30 mass% or less; and the thickness of the interfacial alloy layer is 1 μm or less.
The purpose of the present invention is to provide a hot-dip Al-Zn-based plated steel sheet that stably has excellent bending processing ability and corrosion resistance at a bending processed part, and a method for manufacturing the hot-dip Al-Zn-based plated steel sheet. In order to achieve said purpose, the present invention is a hot-dip Al-Zn-based plated steel sheet provided with a plating film having a compositional makeup containing 45-65 mass% of Al and 1.0-3.0 mass% of Si, the remaining portion being Zn, Fe, and unavoidable impurities, and is characterized in that the plating film has dendrites formed mainly of primary Al crystals and dendrite gaps including Al-Zn eutectic crystals, the primary Al crystals each include an α-Al phase matrix and Zn precipitates, and the Zn content in the matrix is 30 mass% or less.
Provided is a molten Al-Zn-based plated steel sheet that has excellent post-aging yield elongation and formability, while maintaining high bending processability. In order to achieve the above purpose, the present invention provides a molten Al-Zn-based plated steel sheet in which a plating layer has a composition that contains 40 to 70 mass% of Al and 0.5 to 3.0 mass% of Si, the remainder being Zn and unavoidable impurities, the molten Al-Zn-based plated steel sheet is characterized in that, when a test piece is bent by 180° with an inner spacing nt (where t is the plate thickness of the plated steel sheet, and n is the number of the plated steel sheets) in a bending test in conformity with a plating adhesion test described in JIS G 3321 (2019), the bending processability indicated by a minimum nt at which no cracking is recognized when the outer surface of the bent portion is observed with a 10× magnification loupe is less than or equal to 6t, and the yield elongation (YEL) after an accelerated aging test is less than or equal to 10%.
Provided is a molten Al-Zn-based plated steel sheet that has excellent bending processability and non-aging property of yield elongation, and that also has good formability. In order to achieve the above purpose, the present invention provides a molten Al-Zn-based plated steel sheet in which a plating layer has a composition containing 40 to 70 mass% of Al and 0.5 to 3.0 mass% of Si, the balance being Zn and unavoidable impurities, characterized in that: when, in a bending test in conformity with the plating adhesion test described in JIS G 3321(2019), a test piece is bent by 180° with an inner spacing nt (where t is the plate thickness of the plated steel sheet, and n is the number of the plated steel sheets) after an accelerated aging test, and the outer surface of the bent portion is observed with a 10x magnifying glass, the bending processability indicated by a minimum nt at which no cracking is recognized is less than or equal to 6t, and the yield elongation (YEL) after the accelerated aging test is less than or equal to 10%.
Provided is a hot-dip Al-Zn plated steel sheet that has excellent corrosion resistance in a stable manner with certainty. The hot-dip Al-Zn plated steel sheet according to the present invention comprises a plating film and is characterized in that the plating film has a compositional makeup containing 45-65 mass% of Al and 1.0-4.0 mass% of Si, the remaining portion being Zn and unavoidable impurities, and the Ni content in the unavoidable impurities is 0.010 mass% or less with respect to the total mass of the plating film.
C23C 28/00 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and
7.
HOD DIPPED AL-ZN-SI-MG COATED STEEL SHEET AND METHOD FOR PRODUCING SAME, SURFACE-TREATED STEEL SHEET AND METHOD FOR PRODUCING SAME, AND COATED STEEL SHEET AND METHOD FOR PRODUCING SAME
The present invention provides a hot dipped Al-Zn-Si-Mg coated steel sheet which stably has excellent corrosion resistance. In order to achieve the above-described purpose, the present invention provides a hot dipped Al-Zn-Si-Mg coated steel sheet which has a coating film and is characterized in that: the coating film has a composition that contains 45 to 65% by mass of Al, 1.0 to 4.0% by mass of Si and 1.0 to 10.0% by mass of Mg, with the balance being made up of Zn and unavoidable impurities; and the Ni content in the unavoidable impurities is 0.010% by mass or less relative to the total mass of the coating film.
C22C 18/04 - Alloys based on zinc with aluminium as the next major constituent
C22C 21/10 - Alloys based on aluminium with zinc as the next major constituent
C22C 30/06 - Alloys containing less than 50% by weight of each constituent containing zinc
C23C 28/00 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and
B32B 15/08 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance of synthetic resin
B32B 15/092 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance of synthetic resin comprising epoxy resins
B32B 15/095 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance of synthetic resin comprising polyurethanes
C22C 18/04 - Alloys based on zinc with aluminium as the next major constituent
C22C 21/10 - Alloys based on aluminium with zinc as the next major constituent
C22C 30/06 - Alloys containing less than 50% by weight of each constituent containing zinc
C23C 2/06 - Zinc or cadmium or alloys based thereon
C23C 28/00 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and
9.
HOT DIPPED Al-Zn-Si-Mg-Sr COATED STEEL SHEET, SURFACE-TREATED STEEL SHEET, AND COATED STEEL SHEET
B32B 15/08 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance of synthetic resin
B32B 15/092 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance of synthetic resin comprising epoxy resins
B32B 15/095 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance of synthetic resin comprising polyurethanes
C22C 18/04 - Alloys based on zinc with aluminium as the next major constituent
C22C 21/10 - Alloys based on aluminium with zinc as the next major constituent
C22C 30/06 - Alloys containing less than 50% by weight of each constituent containing zinc
C23C 2/06 - Zinc or cadmium or alloys based thereon
C23C 22/44 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH < 6 containing molybdates, tungstates or vanadates containing also fluorides or complex fluorides
C23C 28/00 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and
B32B 15/08 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance of synthetic resin
B32B 15/092 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance of synthetic resin comprising epoxy resins
B32B 15/095 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance of synthetic resin comprising polyurethanes
C22C 18/04 - Alloys based on zinc with aluminium as the next major constituent
C22C 21/10 - Alloys based on aluminium with zinc as the next major constituent
C22C 30/06 - Alloys containing less than 50% by weight of each constituent containing zinc
C23C 2/06 - Zinc or cadmium or alloys based thereon
C23C 28/00 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and
11.
METHOD FOR PRODUCING MOLTEN AL-ZN-MG-SI-BASED PLATED STEEL SHEET AND METHOD FOR PRODUCING COATED STEEL SHEET
In order to provide a hot-dip Al−Zn−Mg−Si−Sr plated steel sheet having good surface appearance and having excellent corrosion resistance at a processed portion thereof, the present invention is characterized in that a plating layer has a composition containing 25-70 mass% of Al, 0.6-5 mass% of Si, 0.1-10 mass% of Mg, and 0.001-1.0 mass% of Sr, the balance being Zn and incidental impurities, the plating layer includes an interface alloy layer provided at an interface with an underlying steel sheet, and a main layer provided on the alloy layer, and an Al−Si−Sr alloy having an average major axis length of 1 μm or less is provided between the main layer and the interface alloy layer.
06 - Common metals and ores; objects made of metal
Goods & Services
Galvanized steel sheets; plated steel sheets; color steel
sheets; iron and steel; iron, unwrought or semi-wrought;
steel, unwrought or semi-wrought; steel sheets; steel wires;
steel pipes; steel tubes; steel strips; building materials
of metal; framework of metal for building; building panels
of metal; building boards of metal; prefabricated metal
buildings; containers of metal for transport; industrial
packaging containers of metal [not including "metal
stoppers, lid and caps"]; liquid storage tanks or reservoirs
of metal; industrial water storage tanks of metal; loading
and unloading pallets of metal; turntables for load
handling; traversers for load handling.
15.
PAINT APPLICATION AND DRYING DEVICE AND PAINT APPLICATION AND DRYING METHOD
A paint application and drying device for paint application and drying treatment while continuously transporting a steel sheet is provided with a transport unit, a paint application unit, an oven, an exhaust unit, a concentration measurement unit, and a control unit. The control unit calculates a predicted delivery concentration on the basis of organic solvent concentration measured by the concentration measurement unit, and when the predicted delivery concentration is a prescribed threshold concentration or greater, control is carried out such that paint application is stopped by the paint application unit while transport by the transport unit continues.
B05C 9/14 - Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by groups , or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating
B05B 12/00 - Arrangements for controlling deliveryArrangements for controlling the spray area
B05B 15/00 - Details of spraying plant or spraying apparatus not otherwise provided forAccessories
B05C 11/00 - Component parts, details or accessories not specifically provided for in groups
B05C 11/10 - Storage, supply or control of liquid or other fluent materialRecovery of excess liquid or other fluent material
B05D 3/02 - Pretreatment of surfaces to which liquids or other fluent materials are to be appliedAfter-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
B05D 3/12 - Pretreatment of surfaces to which liquids or other fluent materials are to be appliedAfter-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
F26B 13/10 - Arrangements for feeding, heating or supporting materialsControlling movement, tension or position of materials
F26B 21/00 - Arrangements for supplying or controlling air or gases for drying solid materials or objects
Provided is a chromate-free coated galvanized steel sheet which exhibits excellent corrosion resistance, especially excellent corrosion resistance in a cut end surface or a processed portion such as a bent portion. A coated galvanized steel sheet according to the present invention is obtained by sequentially forming, on at least one surface of a galvanized steel sheet, a chemical conversion coating film that does not contain a chromate compound, a primer coating film that does not contain a chromate compound, and a top coating film. The chemical conversion coating film contains an anionic urethane resin (a) having an ester bond, an epoxy resin (b) having a bisphenol skeleton, a vanadium compound, a zirconium compound and a fluorine compound, respectively in predetermined amounts. The primer coating film is mainly composed of a polyester resin having a urethane bond, and contains a vanadium compound, a phosphoric acid compound and magnesium oxide. The primer coating film has an elongation at break at 25°C of 20% or more and a tensile strength at 25°C of 20 MPa or more.
C23C 22/60 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH > 8
B32B 15/08 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance of synthetic resin
C09D 5/00 - Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects producedFilling pastes
C23C 2/06 - Zinc or cadmium or alloys based thereon
C23C 28/00 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and
The purpose of the present invention is to provide a molten Al-Zn-Mg-Si-plated steel sheet having favorable corrosion resistance of the flat parts and edges and also having excellent machined part corrosion resistance. To achieve said purpose, the present invention is a molten Al-Zn-Mg-Si-plated steel sheet having a plated coating on the surface of a steel sheet and is characterized in that: the plated coating is obtained from an interfacial alloy layer present at the interface with the base steel sheet and a main layer present on said alloy layer; the coating contains 25-80 mass% of Al, greater than 0.6-15 mass% of Si, and greater than 0.1-25 mass% of Mg; and the content of Mg and Si in the plated coating satisfies formula (1). MMg/(MSi−0.6)>1.7 (1) MMg: Mg content (mass%), MSi: Si content (mass%)
The present invention provides: an induction heating device, a premelt pot, and molten metal plating equipment that have a long life span even with respect to a molten zinc-aluminium alloy bath. Provided is an induction heating device (1) disposed in a premelt pot or main pot of molten metal plating equipment comprising a main pot which accommodates a molten metal including at least zinc and a premelt pot which supplies the molten metal (M) to the main pot and being used for subjecting an object to be plated to metal plating by immersing the object to be plated in the molten metal in the main pot, said induction heating device (1) being provided with an iron core (14), a coil (15) which is wound around the iron core (14), a refractory material (17) which surrounds the coil (15) and in which an orbit path (16) for molten metal through which the molten metal (M) flows is formed, and a bushing (18) which is disposed between the coil (15) and the refractory material (17), being used to obtain a molten metal by subjecting a starting metal to induction heating, and being characterized in that a heat insulation material (20) is disposed between the refractory material (17) and the bushing (18).
C23C 2/00 - Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shapeApparatus therefor
C23C 2/06 - Zinc or cadmium or alloys based thereon
F27D 11/06 - Induction heating, i.e. in which the material being heated, or its container or elements embodied therein, form the secondary of a transformer
19.
HOT-DIP Al-Zn ALLOY COATED STEEL SHEET AND METHOD FOR PRODUCING SAME
The problem addressed by the present invention is to provide a method for producing, on a continuous hot-dip galvanizing line, a hot-dip Al-Zn alloy coated steel sheet having outstanding corrosion resistance in the flat part and excellent corrosion resistance in worked parts by virtue of good workability, and a hot-dip Al-Zn alloy coated steel sheet obtained using said method. In order to address the aforementioned problem, the present invention is characterized in that the steel sheet after hot-dip galvanization is maintained for 5-60 seconds at a temperature of 250-375°C in a continuous hot-dip galvanizing facility.
The objective is to produce a hot-dip Al-Zn alloy coated steel sheet having good corrosion resistance in flat parts, and being easy to work, thereby obtaining a hot-dip Al-Zn alloy coated steel sheet having excellent corrosion resistance also in machined parts. In an effort to achieve this objective, the present invention is characterized by the upper layer of the galvanizing film having a composition containing 20-95 mass% Al, 10% or less of the Al content in Si, and Ca and/or Mg, with the Ca and Mg content totaling 0.01-10 mass%, the remainder being made up of Zn and unavoidable impurities, and the Vickers hardness of the galvanizing film having an average of 50-100 Hv.
[Problem] To propose a wall structure which enables the efficient formation of a large-area finished surface with good smoothness, and a method for constructing the wall structure. [Solution] A wall structure disposed on the surfaces of the outer wall and inner wall of a building construction is configured by being provided with a plurality of magnet sheets (2) which are disposed at intervals and affixed on the surface of a base material (1), and a plurality of metallic plate materials which are detachably supported by the back surfaces thereof being attracted by the respective magnet sheets (2) and form a large-area finished surface by the flattened end surfaces thereof butting against each other. Raising materials (4) which have a thickness to fill a gap formed between the back surfaces of the metallic plate materials (3) and the base material (1) and smoothly hold the metallic plate materials (3) are each disposed between the magnet sheets (2).
E04F 13/24 - Hidden fastening means on the rear of the covering or lining elements
E04F 13/12 - Coverings or linings, e.g. for walls or ceilings composed of covering or lining elementsSub-structures thereforFastening means therefor composed of a plurality of similar covering or lining elements of metal
22.
MOLTEN ZN-AL ALLOY-PLATED STEEL SHEET AND MANUFACTURING METHOD THEREOF
A molten Zn-Al alloy-plated steel sheet with excellent blackening resistance and corrosion resistance, and a manufacturing method thereof are provided. On at least one surface of the steel sheet, a molten Zn-Al alloy plating layer is formed having a composition comprising, in mass%, Al: 3.0-6.0%, Mg: 0.2-1.0% and Ni: 0.01-0.10%, the remainder consisting of Zn and unavoidable impurities, and further, a chemical conversion film containing molybdates is formed as the upper layer of said molten Zn-Al alloy plating layer. By this means, the surface of the plating layer has a structure containing, by surface area ratio, 1-50% of a Zn-Al-Mg ternary eutectic, and, by means of the material / structure of the plating layer and also the chemical conversion film containing molybdates formed on the upper layer of said plating layer, this molten Zn-Al alloy plated steel sheet has excellent blackening resistance and corrosion resistance.
C23C 2/06 - Zinc or cadmium or alloys based thereon
C23C 18/04 - Pretreatment of the material to be coated
C23C 22/40 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH < 6 containing molybdates, tungstates or vanadates
C23C 28/00 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and
23.
MOLTEN ZN-AL-BASED ALLOY-PLATED STEEL SHEET HAVING EXCELLENT CORROSION RESISTANCE AND WORKABILITY, AND METHOD FOR PRODUCING SAME
A molten Zn-Al-based alloy plating layer is formed on the surface of a steel sheet by dipping a steel sheet in a molten Zn-Al-based alloy plating bath, which contains, in terms of mass %, 3 to 6% of Al, 0.2 to 1.0% of Mg and 0.01 to 0.10% of Ni and in which the content of Fe is adjusted to 0.10% or less, and then withdrawing and cooling the steel sheet. Here, by adjusting so that the bath temperature of the plating bath is 420 to 520°C and the temperature of the steel sheet dipped into the plating bath is 420 to 600°C and not lower than the bath temperature of the plating bath, a molten Zn-Al-based alloy-plated steel sheet is formed which has excellent workability and corrosion resistance, which has an Fe content in the plating layer of 2.0 g/m2 or lower and which has a Ni-enriched layer having a thickness of 0.05 to 1.0 μm at the interface of the steel sheet and the plating layer.
06 - Common metals and ores; objects made of metal
Goods & Services
Plating steel plates and sheets; color steel plates and
sheets; wall linings of metal; gratings of metal; shutters
of metal; steel frames for building; building boards of
metal; ceiling boards of metal; doors of metal; pillars of
metal; wainscottings of metal; floor pavings of metal; floor
boards of metal; louver doors of metal; cable racks of
metal; deckplates of metal; metal clasps for building; stair
treads of metal; building frame materials of metal for vinyl
green houses; iron and steel; metal materials for building
or construction.
25.
METHOD FOR REPAIRING WELDED PORTION OF HOT DIPPED ZINC-ALUMINUM ALLOY COATED STEEL MATERIAL, AND WELDED STRUCTURE
A method for repairing a welded portion, which provides excellent adhesion of a repairing material and excellent corrosion resistance of a bonded portion and surrounding portions thereof is proposed, and a welded structure subjected to the repair is provided. Specifically provided is a method for repairing a welded portion of a hot dipped zinc-aluminum alloy coated steel material, which is characterized in that: a first spray layer is formed by spraying an Al-Si alloy on the upper layer of a welded portion of a hot dipped zinc-aluminum alloy coated steel material; a second spray layer is formed by spraying a Zn-Al alloy on the first spray layer; and the spray layers and portions surrounding the spray layers are preferably coated with an inorganic and/or organic antirust treatment layer.
B23K 31/00 - Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups
B32B 15/01 - Layered products essentially comprising metal all layers being exclusively metallic
C23F 11/00 - Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
Provided is a piece of fitting type folded plate roofing wherein there are formed a plurality of crest sections that include crest sections not having seam joint fitting sections; wherein furthermore, mutual connecting strength due to inside seam joints and outside seam joints is improved; wherein thereby there is excellence in wind pressure withstanding strength with respect to wind blow-up pressure; wherein moreover, neither loosening nor disconnection occurs in seam joint fitting sections due to pressing force caused by a worker's treading-down or the like; and wherein thus high seam joint effect is achieved. Said fitting type folded plate roofing is such that seam-joined crest sections and one or more non- seam-joined crest sections are continuously provided, with bottom sections therebetween; that furthermore, either an inside seam joint fitting section or an outside seam joint fitting section is provided on top of each seam-joined crest section; that adjacent rectangular metal plates are connected to each other, with the inside and outside seam joint fitting sections therebetween; that the outside seam joint fitting section has an approximately mushroom-shaped cross section; and that the inside seam joint fitting section has an approximately umbrella-shaped cross section.
Provided is a roofing material such that during construction, the back surface of the roofing material is not susceptible to damage and heat insulation material does not peel away from the back surface. The fitted roofing material is obtained by bending a scooping-side fitting element and a capping side fitting element along both edges of a rectangular main plate section of the roofing material in the widthwise direction. Therein, the capping-side fitting element is configured by interconnecting a capping-side upward-sloping section, which is formed at a position extending from the main plate section, a substantially horizontal capping-side central recessed section, which is formed at a position extending from the capping-side upward-sloping section, and a capping-side first protruding section and a capping-side second protruding section, which are positioned on both sides of the capping-side central recessed section so as to sandwich the capping-side central recessed section therebetween. The first protruding section comprises a capping-side first fitting-cog section, which is formed at a position extending from the capping-side upward-sloping section, a capping-side first top part, which extends substantially horizontally at a position extending from the capping-side first fitting-cog section, a capping-side first downward-sloping part, which is bent from the end of the capping-side first top part, and a capping-side first inclined part, which is formed at the edge of the capping-side first downward-sloping part. The capping-side first downward-sloping part of the first protruding section is inclined slightly from the vertical so as to slope downwards towards the central recessed section.
E04D 3/362 - ConnectingFastening by specially-profiled marginal portions of the slabs or sheets by locking the edge of one slab or sheet within the profiled marginal portion of the adjacent slab or sheet, e.g. using separate connecting elements
E04D 3/363 - ConnectingFastening by specially-profiled marginal portions of the slabs or sheets with snap action
E04D 3/365 - ConnectingFastening by simple overlapping of the marginal portions with use of separate connecting elements, e.g. hooks or bolts for corrugated sheets
28.
PRECOATED STEEL SHEET AND PROCESS FOR PRODUCING SAME
A precoated steel sheet including a photocatalyst layer (coating film) as the outermost layer is provided in which a decrease in aesthetic appearance caused by processing unevenness or interference color streaks is prevented by forming the photocatalyst layer as a discontinuous (network) layer. The precoated steel sheet has performances required of precoated steel sheets, such as appearance evenness and processability, and further has various excellent properties such as a high degree of weatherability, durability of the aesthetic appearance, and resistance to decomposition with the photocatalyst. Also provided is a process for producing the precoated steel sheet. The precoated steel sheet comprises a steel sheet base, a clear coating layer (A) formed over at least one surface of the base, the layer (A) comprising a silicon compound as a main component and containing water-repellent fine particles dispersed therein, and a clear coating layer (B) superposed on the clear coating layer (A), the layer (B) containing, as a main component, fine titanium oxide particles which show photocatalytic activity.
B32B 15/08 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance of synthetic resin
B05D 7/14 - Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
C09D 5/00 - Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects producedFilling pastes
C09D 127/12 - Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogenCoating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
C09D 127/16 - Homopolymers or copolymers of vinylidene fluoride
C09D 133/00 - Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereofCoating compositions based on derivatives of such polymers
C09D 183/00 - Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon onlyCoating compositions based on derivatives of such polymers
Provided is a fitting-type folded-plate roofing material which enhances mutual supporting force by the inner-seam-side fitting part and the outer-seam-side fitting part, and ensures high seam fastening so that the seam fastening joint does not loosen nor come off even if the seam fastening joint is pressed. A fitting-type folded-plate roofing material consists of a base in the lateral center of a rectangular metal plate, inclining side plates which are raised respectively from the opposite lateral ends of the base, horizontal parts stretching in the horizontal direction respectively from the upper ends of the inclining side plates, and an inner-seam-side fitting part and an outer-seam-side fitting part standing respectively from the idle ends of the horizontal parts, wherein the outer-seam-side fitting part has a substantially mushroom-shaped cross section consisting of a base-side leg rising from the edge of the horizontal part, a dome-shaped head provided continuously to the upper end of the base-side leg, and a side-end-side leg formed at a position extended from the dome-shaped head, and the inner-seam-side fitting part has a substantially umbrella-shaped cross section consisting of a leg rising from the edge of the horizontal part, and a mountain-shaped head provided continuously to the upper end of the leg.
A hot-dip Zn—Al alloy coated steel sheet exhibiting a beautiful coating appearance with metallic luster, in which no spangle or very fine spangles are formed, and having excellent blackening resistance and a method for manufacturing the hot-dip Zn—Al alloy coated steel sheet are provided. The hot-dip Zn—Al alloy coated steel sheet includes a hot-dip Zn—Al alloy coating layer containing 1.0 to 10 percent by mass of Al, 0.2 to 1.0 percent by mass of Mg, 0.005 to 0.1 percent by mass of Ni, and the balance being Zn and incidental impurities on at least one surface of a steel sheet. The manufacturing method includes the steps of dipping the steel sheet into a hot-dip Zn—Al alloy coating bath and pulling up and cooling the steel sheet, wherein the steel sheet pulled up from the coating bath is cooled to 250° C. at a cooling rate of 1° C. to 15° C./sec.
The invention provides a chromium-free surface treated, hot-dip Zn-Al alloy coated steel sheet which has excellent corrosion resistance and blackening resistance and is excellent in the surface appearance of plating. According to the invention, a steel sheet which has on the surface a hot-dip Zn-Al alloy plating layer containing Al: 1.0 to 10%, Mg: 0.2 to 1.0% and Ni: 0.005 to 0.1% is surface-treated with a surface treatment composition containing a specific titanium-containing aqueous solution, a nickel compound and/or a cobalt compound, and a fluorine -containing compound at a specific ratio to form a surface treatment film on the surface. Excellent blackening resistance is attained by virtue of the Ni and/or Co component contained in the surface treatment film and the optimized plating composition. Further, the surface treatment composition exhibits enhanced reactivity by virtue of the fluorine -containing compound to form a dense reaction layer on the surface of the plating and the fluorine-containing compound imparts higher barrier properties to the surface treatment film itself, which makes it possible to attain excellent corrosion resistance.
C23C 28/00 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and
C23C 2/06 - Zinc or cadmium or alloys based thereon
C23C 22/34 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH < 6 containing fluorides or complex fluorides
C23C 22/44 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH < 6 containing molybdates, tungstates or vanadates containing also fluorides or complex fluorides
32.
HOT-DIP Zn-Al ALLOY COATED STEEL SHEET AND PROCESS FOR THE PRODUCTION THEREOF
The invention provides a steel sheet coated with a Zn-Al alloy by hot dipping which has a beautiful metallic-luster coating appearance either free from spangles or with extremely fine spangles and is excellent in blackening resistance; and a process for the production of the sheet. The steel sheet has on at least one side a hot-dip coating layer made of a Zn-Al alloy which contains Al: 1.0 to 10% by mass, Mg: 0.2 to 1.0% by mass, and Ni: 0.005 to 0.1% by mass with the balance being Zn and unavoidable impurities. The process is one which comprises dipping a steel sheet into a Zn-Al alloy hot-dip plating bath and drawing up the sheet from the bath to cool it wherein the temperature fall rate of the sheet drawn up from the bath until 250°C is 1 to 15°C/s.
