... pipes for pipeline transportation systems. API 5L GR B seamless steel pipe is still in ... in worldwide engineering industry. 1. API 5L GR.B STEEL PIPESPSL1Chemical Composition Steel grade Mass fraction, ... ,281,20–0,0300,030c,dc,dd2. API 5L GR.B STEEL PIPES PSL1Carbon Pipe Mechanical Properties ... (60 200)c415 (60 200)3. API 5L GR.B STEEL PIPES PSL2 Chemical Composition Steel grade ( ...