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Hot Dip Galvanized Pipe | GI Pipe

Application: Used for transporting low pressure liquid, gas and heating. 

Specification: OD: 21.3mm ~ 406.4mm

                          WT: 0.5mm ~ 20mm

                          LENGTH: 0.3mtr ~ 18mtr, Ramdon Length, Fixed Length, SRL, DRL

Standard and Grade: GB/T 3091 Q195/Q215/Q235/Q345, ASTM A53, BS 1387, JIS G3444 STK400/STK500, EN 39, EN 1139 S235JR/S275JR, EN 10025, EN 10219

Pipe Type: Seamless & Welded Steel Pipe (Round/Square/Rectangular)

End: Square Cut/Threaded, Burr Removed

Zinc Coating: 120~500 g/m2 (30um~70um)

Packing: Steel Strips bundled, Plastic Caps plugged, Waterproof Paper wrapped etc.

               

Hot Dip Galvanizing Process


Material Inspection (Steel Pipe) --- Hanging --- De-greasing --- Rinsing --- Pickling --- Washing --- Dipping Fluxing --- Hot Air Drying --- Inside and Outside Hot-dipped Galvanizing Blow
--- Cooling --- Passivation and Rising --- Unloading --- Inspection and Trimming --- Type Identification --- Packaging and Storing and Transportation


 

Product Advantages


- Extraordinary Anti-corrosion Characteristic
- Strong Adhesive Zinc Coating on the steel pipe
- Evenly Covered Zinc Coating on the internal and external pipe surface
- Measureable Zinc Coating Thickness
- Long Application Life for the steel pipe

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Commitment to Our Clients


- We Make it Right. Right Products=Customized Products, Right Price=Competitive Market Price, Right Packing=Safe Packing
- On Time Delivery. 48 Hours Domestic Delivery by Truck. 10~45 Days International Shipping by Cargo.
- Extraordinary Customer Services. One-stop Procurement for Steel Pipes and Fittings, Flexible Payment Terms, Professional After-sales Services Team

Project Application


   


A53 Pipe Materials & Manufacture

Steel materials used to create seamless pipe and welded pipe must be produced via open hearth, electric furnace, basic oxygen, or any combination of these processes. All weld seams in electric-resistance welded A53 Grade B pipe must be heat treated after welding to a minimum of 1,000°F (540°C) to eliminate untempered martensite.

 

Chemical Requirements 

Carbon Manganese Phosphorus Sulfur Copper Nickel Chromium Molybdenum Vanadium
Composition, max. %
Type S (seamless pipe) & Type E (electric-resistance-welded)
Grade A 0.25 0.95 0.05 0.045 0.4 0.4 0.4 0.15 0.08
Grade B 0.3 1.2 0.05 0.045 0.4 0.4 0.4 0.15 0.08
Type F (furnace-welded pipe)
Grade A 0.3 1.2 0.05 0.045 0.4 0.4 0.4 0.15 0.08

Galvanized A53 Pipe
If ordered galvanized, A53 seamless pipe must be coated inside and out via the hot-dip process. Zinc used for galvanized coatings must conform to Specification B6. The weight of this coating must not be less than 1.8 oz./ft2 (0.55 kg/m2). Test specimens for coating weight testing will be cut in approximately 4” lengths.
Permissible Variation in Wall Thickness
The minimum wall thickness at any point in a length of A53 steel pipe must not be more than 12.5% less than the specified wall thickness.
Permissible Variations in Outside Diameter
For ASTM A53 steel pipe NPS 1-1/2 and smaller, outside diameter must not exceed 1/64” over and 1/32” under specified diameter. For A53 pipe NPS2 and larger, outside diameter must not exceed 1% over and 1% under specified diameter.
Hydrostatic Testing of ASTM A53 Pipe 
Separate hydrostatic inspection test pressures are specified for plain end, threaded, and coupled A53 steel pipe. Minimum hydrostatic test pressure for NPS 3 and under is 2,500 psi; minimum test pressure for sizes over NPS  3 is 2,800 psi. Pressure must be maintained for a minimum of 5 seconds, for all sizes.
Mechanical Testing of ASTM A53 Pipe
Electric-resistance welded ASTM A53 steel pipe of NPS 8 and larger must be transverse tested. Sending test (cold) is required for STD and XS-NPS 2 and under, and for XXS-NPS 1-1/4 and under. Flatten testing is required for NPS 2 and larger STD and XS A 53 pipe; flatten testing is not required for XXS pipe.