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1.black steel pipe for general use: ASTM A 53 GR.B,
Steel Grade: SA53B and specication 1/2"-48", 21.3-965mm
2.black steel pipe for high temperature:ASTM A 106 GR.B,
Steel Grade: SA106B and specication 2"-48", 60.3-965mm
3.Pipeline: API SPEC 5L.
Steel Grade: B,X42,X46,X52 and specification 2"-48", 60.3-965mm
4.black steel pipe for low temperature of -40C-101C, ASTM A333,
Steel Grade: GR.A,GR.1,GR.7,GR.3 specication 2"-48", 60.3-965mm
5.black steel pipe DIN2448/1629,DIN17175-1979, German standard,
Steel Grade: st37,st42,st52,st35.8-st45.8/1, specication 2"-48", 60.3-965mm

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