Galvanized Steel Coils Supplier From Vietnam – GTS Steel

HDG coils according to European standards

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:

Galvanised steel coils as per the 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:

  • 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.

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GI GL PPGI PPGL manufacturer, supplier from Vietnam.

HDG coils according to US standards

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.

Production of galvanised steel coils

There are two widely used methods for applying zinc coating on steel coils:

• Hot-dip galvanising (HDG) technology is used to create a protective layer by immersing a steel strip into a bath of molten zinc. Hot-dip galvanised steel coils can be produced by continuous galvanising lines with non-oxidising annealing furnaces (the Sendzimir method and its variations) or by applying wet or dry flux (the Cook-Norteman method and its modifications). Hot- or cold-rolled non-annealed (full-hard) steel coils are used as feedstock for continuous hot-dip galvanising lines with non-oxidising annealing furnaces.

• The production process involves electrochemically cleaning, drying and annealing the strip to obtain the required mechanical properties, followed by immersing the material into a bath of molten zinc and controlling zinc thickness. The strip then undergoes forced cooling and finishing (passivation, oiling, levelling, drying and coiling the galvanized coil). When using lines that apply wet or dry flux, feedstock (before it is galvanized) should have the required set of mechanical properties since such lines do not have annealing furnaces.

• The strip is first degreased with an alkali solution and pickled in acid, following which a smooth layer of flux composed of a combination of zinc chloride, ammonia chloride and various additives is applied to the strip. The strip is then put into a strand furnace with a protective atmosphere, where the flux is dried, and is immersed into a bath of molten zinc. The flux completely removes residual pickling substances and moisture from the metal surface, and the thin film reduces the surface tension of zinc and ensures the best moistening of the metal surface. Hot-dip galvanising technology is fairly universal and is widely used in construction, machine building and other industries. It is used by both large steel mills and re-rollers/coaters.

• Electrolytic galvanising is an electro-chemical process in which a layer of zinc is applied in a bath of acid or alkali electrolytes. The main idea of this technology is to use oxidising and reducing reactions, during which electrons move through the electron transport chain, while zinc ions in the electrolyte flow from anode to cathode.

• This type of coating is usually used for thin-gauge material; the coating thickness is normally 5-12 μm and it accurately follows the shape of the product. The absence of intermediate brittle layers makes electrolytic zinc coating more plastic compared with coating applied via hot-dip galvanizing. Major application areas for such products include automotive, transport and machine building, among others.

Buy galvanized teel coils from the manufacturer in Vietnam:

VSS Steel offers galvanised steel coils with a thickness of 0.4-2.0 mm and a width of up to 1,250 mm for construction and machine building applications, roofing.

Our galvanized steel coils products are supplied in accordance with the requirements of key international standards (EN 10346, ASTM A653/A653M, GOST 14918, GOST R 52246).