Apr. 29, 2024
Construction & Real Estate
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Standards applied in different countries to set the requirements for galvanized steel coils specify steel grade and size ranges for these products. Galvanised steel coils are classified based on the following features:
Application of coated steel (profiling, cold forming, manufacture of steel structures)
Chemical composition of coating material (pure zinc, zinc-iron/zinc-aluminium/aluminium-zinc/zinc-magnesium alloys, etc)
Thickness/weight of protective coating
Galvanised steel coils as per the European EN 10346 and the similar Ukrainian DSTU EN 10346 standards can be coated with zinc, zinc-iron alloy, zinc-aluminium alloy, aluminium-zinc alloy or aluminium-silicon alloy:
Zinc coating (Z) is achieved by dipping the prepared strip into a bath with molten alloy, containing at least 99% zinc. This is the most common and traditional way of protecting rolled steel from corrosion.
Zinc-iron coating (ZF) is formed by dipping a strip into a bath of molten zinc (at least 99% zinc) with further annealing to form a zinc-iron coating with an Fe content of 8-12%. Such coating is stronger than the traditional zinc coating and has better adhesion with substrate steel due to mutual diffusion between the iron and zinc in the surface layers. That is why this coating is less exposed to lamination or pitting under impact, mechanical stresses or deformation of treated products.
Zinc-aluminium coating (ZA) is applied to rolled steel by dipping it into a bath of zinc and about 5% aluminium with a minor content of mishmetal (mix of metals). Rolled steel with such coating has better formability and corrosion protection properties compared with zinc-coated steel.
Aluminium-zinc coating (AZ) is applied by dipping steel into a bath of molten metal consisting of 55% aluminium and 1.6% silicon (with the remaining being taken up by zinc). The combined action of these metals ensures the best corrosion protection compared with other coatings.
Aluminium-silicon coating (AS) is created by dipping steel into a bath of molten metal containing aluminium and 8-11% silicon. Galvanized steel coil with such coating is highly resistant to oxidation at high temperature (up to 650°C) and highly resistant to chemical corrosion.
Galvanised steel coils manufactured according to the EN 10346 and DSTU EN 10346 standards can be made from the following steels:
Low-carbon steel for cold forming (DX51D – DX57D). These products are classified based on suitability for cold forming: DX51D – bending and profiling quality; DX52D – drawing quality; DX53D – deep-drawing quality; DX54D – special deep-drawing quality; DX55D – special deep-drawing quality (only +AS); DX56D – extra deep drawing quality; DX57D – super deep drawing quality.
Steel for construction and framing (S220GD – S550GD). Rolled products are arranged in increasing yield stress (Rp0.2), which is indicated in the marking. Rolled products of S220GD – S550GD steel are mainly used in the manufacture of formed sections (Z-, C-, sigma-, U-shaped profiles, etc) for light-gauge steel structures.
Steel with high yield strength for cold forming (HX160YD, HX180YD, HX180BD, HX220YD, HX300LAD, etc). Such rolled products are arranged in increasing yield stress (Rp0.2), which is indicated in the marking. The marking also contains the following information: H – high-strength flat rolled products for cold forming; Х – as-rolled condition (hot-rolled or cold-rolled) is not defined; D – designed for hot-dip coating; B – heat-treated steel; Y – steel with higher formability; LA – low-alloy / micro-alloy steel.
Cold-formable multi-phase steel (HDT450F, HCT490X, HDT590X, HCT780X, HCT980X, HCT780T, HDT580X, etc). Rolled products are arranged in increasing minimum tensile strength (Rm0.2), which is indicated in the marking. The marking also contains the following information: H – high-strength flat-rolled products for cold forming; С – cold-rolled products; D – hot-rolled products; Т (nnn) – the minimum tensile strength in MPa. The last symbol: F – ferrite-bainite, Х – dual-phase; Т – TRIP, С – complex-phase; М – martensite.
Galvanised coils as per the EN 10346 standard can be coated with zinc, zinc-iron alloy, zinc-aluminium alloy, aluminium-zinc alloy or aluminium-silicon alloy. The coating weight is expressed as grams per square metre and characterises the weight of the coating deposited on the both strip surfaces. The coating type (Z, ZF, ZA, AZ, AS) and nominal weight are indicated in the coating designation. Depending on the type of protective layer, the minimum weight of coating on both surfaces of a galvanized product can be 100-600 g/m2 (average value for three spots).
Coating designation
Minimum total coating weight for both surfaces, g/m2
Theoretical recommended values of the coating thickness per unit of surface for single-spot tests, microns
Density,
g/cm3
Three-spot
Single-spot
Reference value
Interval
Z100
100
85
7
5-12
7.1
Z140
140
120
10
7-15
Z200
200
170
14
10-20
Z225
225
195
16
11-22
Z275
275
235
20
15-27
Z350
350
300
25
19-33
Z450
450
385
32
24-42
Z600
600
510
42
32-55
Galvanised steel coils as per the EN 10346 and DSTU EN 10346 standards are also classified based on:
Types of surface quality:
А – surface quality right after coating application
В – surface quality improved by processing in a skin pass mill
С – highest surface quality also obtained by processing in a skin pass mill; the controlled surface should allow for the application of a homogeneous layer of decorative paint, while the other surface should have minimum quality B
Surface treatment:
Chemically passivated – С
Oiled – О
Passivated and oiled – СО
Phosphate treated – Р
Coated with organic insulation – S
Surface finishing:
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Standard spangle pattern (normal gloss) N is obtained by allowing zinc coating to harden naturally
Minimum spangle pattern (minimum gloss) M is obtained by adjusting molten zinc composition and special measures for hardening and/or subsequent surface finishing
Geometry and size tolerances for steel sheets and strip coated by hot dipping should meet the requirements of the European EN 10143 standard and its Ukrainian analogue DSTU EN 10143.
The main US standard followed for the production of hot-dip galvanized coils with metallic coating is ASTM A653/A653M.
Galvanised products can be produced from the following steels:
Commercial steel (CS, types А, В and С)
Formable steel (FS, types А and В)
Deep drawn steel (DDS)
Structural steel (SS)
High-strength low-alloy steel (HSLAS, types А and В)
Solution hardened steel (SHS)
Bake hardenable steel (BHS)
Depending on the class of selected zinc coating (G01-G360 for British Imperial system, or Z001-Z1100 for international system of units SI), the minimum weight of protective material can vary from 90 tо 1,100 g/m2 on both sides of the product.
Geometry and size tolerance for galvanised steel coils produced to ASTM A653/A653M should meet the requirements of ASTM A924/A924M.
The key standards defining technical specification for zinc-coated steel produced in the CIS include GOST 14918 and GOST R 52246.
GOST 14918 is applied to cold-rolled hot-dip galvanised steel sheets and coils produced by continuous galvanising lines and intended for cold profiling, colour coating, manufacture of formed goods, tableware, tare and other metal goods. According to this reference document, steel can be classified based on:
Application: cold stamping, cold profiling, colour coating (skin passed), general application
Drawing capability: normal drawn, deep drawn, extra deep drawn
Smoothness of zinc coating thickness: normal crown, lesser crown
Spangle pattern: with spangle pattern, without spangle pattern
Class of coating thickness: enhanced (570-855 g/m2 on both sides); 1 (258-570 g/m2); 2 (142.5-258 g/m2)
Galvanised steel produced to GOST 14918 has a thickness of 0.5-2.5 mm and a width of 710-1,800 mm. Dimensions, acceptable tolerances and other requirements for the product range should correspond to GOST 19904.
GOST R 52246 is followed to produce galvanised steel coils with zinc and iron-zinc coating from low-carbon steel intended for the manufacture of goods by bending and interlocking joint as well as profiled, formed and welded metal ware. Galvanised rolled steel is classified based on:
Application:
01 – manufacture of flat and flat bent goods
02 – houseware, manufacture of goods by bending and interlocking joint
03 – formed extra deep drawn parts and complicated profiles
04 – formed complex drawn goods
05 – formed super complex drawn goods
06 – super deep drawn goods
220, 250, 280, 320, 350 – for profiled goods
Manufacturing accuracy:
Normal accuracy
Improved accuracy
High accuracy
Edge condition:
Mill edge
Trimmed edge
Weight of zinc coating – 60, 80, 100, 140, 180, 200, 225, 275, 350, 450, 600 classes
Zinc spangle pattern and surface finish:
Normal spangle
Normal spangle (skin-passed)
Minimum spangle
Minimum spangle skin-passed
Iron-zinc
Iron-zinc skin-passed
Surface preservation:
Oiled
Passivated and oiled
Galvanised steel produced to GOST 52246 has a thickness of 0.3-4.5 mm and a width of 700-1,800 mm when manufactured in sheets, or a width of 500-1,800 mm when manufactured in coils. Dimensions, acceptable tolerances and other requirements for the product range should correspond to GOST 19903 or GOST 19904.
Product Description
Galvanized steel is to prevent surface from corrosion and prolong the service life of the steel surfaces, coated with a layer of metal .zinc the king of zinc coated thin plate called galvanized sheet..
Hot-dip galvanized is hot - rolled steel coils, or cold-rolled steel as a substrate, after a continuous hot-dip galvanized process and then produced. The cross-section to a rectangular plate which for supply is hot dip galvanized sheet; by the take -up in order to supply hot roll galvanized volumes. Therefore, hot-dip galvanizing can be classified into hot-rolled coils galvanized coils and cold rolled coils, which are mainly used in construction, housed hold appliances, automobiles, container, transport and family business and other fields, in particular, steel construction, automobile manufacturing, steel silo manufacturing and other industries.
Detailed Photos
Product Parameters
Product Name Hot dipped cold rolled electro zinc coat galvanized steel coil MaterialQ235, Q345, Q195, Q215, St37, St42, St37-2, St35.4, St52.4, ST35
Thickness0.13mm TCT up to 4.0mm TCT.
Width50mm-2000mm or customized
Zinc CoatingZ40g-Z275g
Surface SurviceRegular spangle,Minimum spangle, Zero spangle, Big spangle
StandardJIS G 3302, ASTM A653, EN10346, AS1397, DIN, GB2518
Steel gradeSGCC, SGC340-490, SG220GD-SG350GD, DX51D+Z, DX52D+Z, G250-G450
Factory
Applications
Building & Construction:
Roofing; Terrace; Window Frame;
Door:
Rolling-up Door; Shutter; Mobile House;
Interior Decorations:
Wall; Door Frame; Steel Structure; Screen; Ceiling;Elevator;
Household Appliances:
Fridge; Washing Machine; Microwave Oven; Air-Conditioner; Duplicating Machine,etc;
Transportation:
Auto Panel; Interior Decorative Panel; Carriage Panel;
Certifications
Packaging & Shipping
FAQ
Type of Galvanized Spangle:
Galvanized with regular spangle, zinc-coated from 30g to 275g(g90). thickness from 0.15mm to 2.0mm. Regular spangle galvanized can be used in hot and wet outdoor places. For example fence, roofing, garage door, etc.
Galvanized with zero spangles, this kind of GI with brightly surface, zinc-coated from 30g to 2755g(g90). thickness from 0.12mm to 0.25mm. It could be used outdoor also. Currently mainly exported to Southeast Asia and Africa. It is cheaper than gi with regular spangle. This product can be processed later, for example, processed into stone coated tiles.
How long the service life of regular spangles and zero spangles galvanized?:
Service life depends on the Scope of application. Normally 5-10years without zinc dropping. If the incision is processed, then the useful life more than 10years.
Galvanized steel coil could be oiled?:
Yes, it could be oiled. 8-20g per square meters. Oiling can prevent the oxidation of galvanized sheets in a short time.
How long does it usually take to deliver the product?:
We will make the shipment to you immediately. It will take about 18 to 40 days arrive worldwide. It depends on the specific quantity.
For more prepainted steel coil for commercial appliancesinformation, please contact us. We will provide professional answers.
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