... 3.material:carbon steel,stainless steel,alloy ProductCarbon steel seamless pipe,Erw steel pipeStandardASTM A53,ASTM A106,API 5L,ASME B36 ... ,ST35,ST37,ST42,ST45,STPG42Size1/2"-48"Wall ThicknessSCH20,STD,SCH40,SCH80,SCH160,XXSlength5-12mSurface treatmentblack rust-proof oil,transparent oil ... after conformed or according to customers requirement seamless carbon steel pipe