Standard: GB, ASTM, API Outer Diameter: 18 - 460 mm Thickness: 3 - 60 mm Product ... ,ST45-4/8),45#(DIN CK45),16mn(ST52.4) etc.b. JIS Standard10#(STPG38,STS38,STB30,STB33,Stb35), 20#(STPG42,STB42 ... ,A179-C),20#(ASTM A106/53 Gr.B, A178-C,A210-A-1,A315-B,AISI1020),45#(AISI1045), 16mn(ASTM A210-C ... do not hesitate to let us know, thanks ASTM A106 Grade B carbon seamless steel pipe