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ASTM A53 A36 Q345b 1.0425 Seamless Carbon Steel Pipes Hollow Tubes Product Paramenters Material Grade Q235A,Q235B,0Cr13,1Cr17,00Cr19Ni11,1Cr18Ni9,0Cr18Ni11Nb,16Mn,20#,Q345,L245,L290,40#,60#,X42,X46...