... : GB/T3091 – 2001 ,BS1387 – 1985 , DIN EN10025 ,EN10219 , JIS G3444:2004 , ASTM A53Steel Grade: GB/T3091 – 2001: Q235 , Q345BS1387 – 1985 , DIN ... EN10025 ,EN10219 :S235JR ,S275JR,S355JR, S355J2HJIS G3444:2004:STK400 ,STK500ASTM A53: GR. A , GR. B, GR. C , GR ...