... 4 inch SpecificationOD 33mm - 406mm(1”~16”) with thickness of 3~30mmStandardGB/T8162,GB/T8163 and DIN/JIS/ASTM ... S20C),45#(JIS S45C), 16mn(STS49,STPT49) etc.c. ASTM/AISI Standard10#(ASTM a106/53 Gr.B, ... 1,A315-B,AISI1020),45#(AISI1045), 16mn(ASTM A210-C) etc.Usage Appilcation boiler use,water transport, building, ... mark on the pipepayment termT/T or L/C at sight.Methodcold drawning, hot rolling or hot ...