Detailed Product Description Features:1) Steel grade: ST37-2, S235JR, Q235A/B, Q345B, Q390B, SS4002) Size: 30 x 30mm-400 x 400mm; ... x 500mm3) Standard: GB/T13793-1992; ASTM A53, JISG, DIN1626/2-24584) Supply ability: 20,000MT/month5) Marking: as per customers ...