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Standard ASTMA139,ASTMA252, API 5L, DIN, EN10217/10219/10224,BS, JIS Grade ASTMA53 Gr.B;API5L Gr.B,X42~X70; ASTMA252 Gr.2,Gr.3; ST37, ST42,ST52;EN10025 S235JR,S275JR,S355JR etc. Usage: for construcito...