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Hot-dip galvanizing involves three main steps:
Preparation: The galvanizing reaction will only occur on a chemically clean surface, so the first step of the process involves removing contamination. First, the metal is degreased using a caustic solution and then dipped in hydrochloric acid to remove rust, mill scale, welding slag, paint and grease. This followed by a rinse and a dip in a flux solution, which is usually about 30 percent zinc ammonium chloride.
Galvanizing: When the clean iron or steel component is dipped into the molten zinc (at 842°F (450°C)), zinc-iron alloy layers form as a result of a metallurgical reaction between the iron and zinc. When the material is pulled from the galvanizing bath, a layer of molten zinc is present on top of the alloy layer. When it cools, it has the bright, shiny appearance associated with galvanized products.
Inspection: After galvanizing, the coated materials are inspected for coating thickness and coating appearance. A variety of simple physical and laboratory tests may be performed to determine thickness, uniformity, adherence and appearance of the zinc coating.
Quite simply, galvanizing a metal gives it anti-corrosion properties. Without the protective zinc coating, the metal would remain exposed to the elements and potentially oxidize and corrode much faster. Galvanized Steel is a cost effective alternative to using materials such as austenitic stainless steel or aluminum in order to prevent corrosion.
Product Description
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Hot Dip Galvanized Steel Pipe
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Size
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OD
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21.3mm~1620mm(round)
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Thickness
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0.5mm-30mm
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Length
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1-12m or as per customer's requirement
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Surface
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Hot dipped galvanized, 20g-275g/m²
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Standard
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GB/T13793-1992,GB/T14291-2006, GB/T3091-1993,GB/T3092-1993,GB3640-88 BS1387/1985,ASTM A53/A36,EN39/EN10219,API 5L,GB/T9711.1-99 etc
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Material
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Q195-Grade B, SS330, SPC, S185 Q215-Grade C, CS Type B, SS330, SPHC Q235---Grade D, SS400, S235JR, S235JO, S235J2 Q345---SS500, ST52
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Application
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Widely used in structure, accessorize,construction, machinery parts,fluid transportation,the stress parts of the automobile tractor parts and so on.
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Package
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1) Big OD: in bulk;
2) Small OD: packed by steel strips; 3) Plastic bags; 4) According to customer's requirement. |
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Delivery time
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within 7 working days after receiving the deposit
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Advantage
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1) Reasonable price with excellent quality;
2) Abundant stock and prompt delivery; 3) Rich supply and export experience, sincere service; |
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Main Product:
Seamless Steel Pipe,
Welded Steel Pipe,
Galvanized Steel Pipe ,
Square Tube,
Steel Section,
Steel Plate
