... Standard 10#(ST37-2,ST35-8),20#(ST42,ST45-4/8),45#(DIN CK45),16mn(ST52.4) etc.b. JIS Standard10#( ... STPG38,STS38,STB30,STB33,Stb35), 20#(STPG42,STB42,STS42,JIS ... Standard10#(ASTM a106/53 Gr.B,A192,A179-C),20#(ASTM A106/53 Gr.B, A178-C,A210-A ... Features Of Product OD +/-1%,Thickness +12.5% / -10%,length +/-2 cm 1.Steel wall without oxide layer 2. No cracks ...