... .Standard:ASTM,API,DIN,GOST 2.Grade:A53,A106,API 5L Gr.B 3.Size:1/2-20inch ASTM A53/A106 ... /API 5L Gr.b seamless steel pipe Product Introduction: 1. Kind: carbon ... 3. Steel Grade:A53 (A,B),A106(A,B),API 5L Gr.B,X42,X52,X60,st42,st37,st52,SS400,SS490 ... . Chemical composition: C: 0.17-0.24 Mn:0.35-0.65 P:≤0.035 S:≤0.035 9. Production Certificate:API 5L ,API 5CT,ISO 10 ...