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what's the normal standard of the hot rolled steel square tube?
The normal standard are GB/T6728:2002 , ASTM A500 , JIS G3466 , EN10210 ,EN10219, ASTM A500 Gr. A.B.C.
Steel Grade: Q195-Q235 , Q345 , S235, S355, S235JR, S355JR.STK400/500