rectangular pipe: 1.Grade:201,202,301,304,316L,etc 2.OD ... WELDED TYPE:TIG From the nature, To the excellence. Name rectangular pipe ItemsSquare tubes, round tubes, oval pipes, special shaped ... A554, A249, A269 and A270Material Grade201: Ni 0.8%~1%202: Ni 3.5%~4.5%304: Ni 8%, ... .15≤0.08≤0.035≤0.12Si≤1.00≤1.00≤1.00≤1.00≤1.00Mn5.5-7.57.5-10≤2 ... %≥35%≥35%Hardness (HV)<105<100<90<90Application rectangular pipe