QStE340TM QStE380TM QStE420TM QStE460TM QStE500TM 牌号 化 学 成 分 % C Si Mn P S Ti Nb Alt SAPH310 ≤0.10 ≤0.30 ≤0.50 ≤0.035 ≤0.035 - - ≥0.010 SAPH370 ≤0.21 ≤0.30 ≤0.75 SAPH400 ≤0.21 ≤0.30 ≤1.20 ≤0.030 ≤0.025 SAPH440 ≤1.50 B440QK (BQK440) ≤0.21 ≤0.35 ≤1.80 ≤0.030 ≤0.025 - - ≥0.010 QStE340TMa ≤1.30 QStE380TMa ≤1.40 QStE420TMa ≤0.12 ≤0.50 ≤1.50 ≤0.030 ≤0.025 ≤0.22 ≤0.09 ≥0.015 QStE460TMa ≤1.60 QStE500TMa ≤1.70 B330CL ≤0.10 ≤0.05 ≤0.50 ≤0.030 ≤0.025 - - ≥0.020 B380CL ≤0.12 ≤0.05 0.50~1.20 ≤0.030 ≤0.025 - - ≥0.020 B420CL ≤0.12 ≤0.30 0.80~1.20 ≤0.030 ≤0.025 - - ≥0.020 B320L ≤0.10 ≤0.05 ≤0.50 ≤0.030 ≤0.035 - - - B420L ≤0.12 ≤0.50 ≤1.20 ≤0.030 ≤0.025 - ≤0.04 - B510L ≤0.16 ≤0.50 ≤1.60 ≤0.030 ≤0.025 - ≤0.06 - B510DL ≤0.18 ≤0.30 ≤1.60 ≤0.025 ≤0.020 - - ≥0.010 B550L ≤0.16 ≤0.50 ≤1.60 ≤0.030 ≤0.025 - - - B440QZR ≤0.12 ≤0.50 ≤1.30 ≤0.030 ≤0.025 - ≤0.04 - B480QZR ≤0.16 ≤0.50 ≤1.50 ≤0.030 ≤0.035 - - a由供方选定含Nb和/或Ti,此外还可以加V,但这三种元素含量之和不得**过0.22%。