... #, Q345A/ B/ C/ D, 27SiMn, 40Cr, 40CrMn, 20CrMn, 30Mn Executive standard: GB8162 ( structural pipe ) , GB8163 ( fluid pipe ) ,GB3087-99 ( boiler pipe ... ) , GB9948-88 ( petroleum cracked pipe ) , DIN17175-95 ( German standard ) , ST45.8, ASTM 106B etc. foreign standard 2. straight weld tubing, galvanized pipeSize: dia ...