... 21.3-219.1mmTHK:2.41-25.40mmStandard:GB/T8162-1999, GB/T8163-1999, ASTM A53, ASTM A106, ... up to 12mStandard:GB/T 9711.1-1997, SY/T 5037-2000, CJ/T 3022-93, SY/T 5040-2000, ... 40mm standard: API SPEC 5L, ASTM, GB/T9711.1-1997, GB/T5037-2001, GB/T5040 material:16MN, Q2953. ERW Steel ... applicable under low, middle and high temperature conditions, including elbow, bend, tee, reducer, flange, support and hanger ...