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the features of our rectangular steel pipes are as follows: 1)size: 10*20mm-500*600mm (seamless & welded) 2)thickness:0.6mm-25mm 3)standard:astm a500,gb/t 3094,gb/t 6728,jg/t 178,gb/t 8162,gb/t 8163,din en 10210,din en 10219, jis g3466,etc 4)material:a500 gr.a b,q195,q235,q345,16mn,20#,st 37-...
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