SPFH780酸洗卷

Q/BQB 310－2018
4
表 2
牌号
化学成分 a（质量分数） ％
C Si Mn P S Alt
SAPH310 ≤0.10 ≤0.30 ≤0.80
≤0.025 ≤0.020
≥0.010
SAPH370 ≤0.21 ≤0.30 ≤1.00
SAPH400
≤0.21 ≤0.30
≤1.40
≤0.025 ≤0.020
SAPH440 ≤1.60
SPFH540 ≤0.15 ≤0.50 ≤1.80
SPFH590 ≤0.18 ≤0.60 ≤2.00 ≤0.025 ≤0.020
SPFH780 ≤0.20 ≤1.00 ≤2.10
B440QK ≤0.21 ≤0.35 ≤1.80 ≤0.025 ≤0.020
B330CL ≤0.10 ≤0.30 ≤0.80
B380CL ≤0.12 ≤0.30 ≤1.50 ≤0.025 ≤0.020
B420CL ≤0.12 ≤0.30 ≤1.50
B450CL ≤0.10 ≤0.30 ≤1.50 ≤0.025 ≤0.020
B500CL ≤0.12 ≤0.30 ≤1.60 ≤0.025 ≤0.020
B530CL ≤0.12 ≤0.30 ≤1.60 ≤0.025 ≤0.020
B550CL ≤0.12 ≤0.30 ≤2.00 ≤0.025 ≤0.020
B600CL ≤0.15 ≤0.30 ≤2.00 ≤0.025 ≤0.020
B650CL ≤0.15 ≤0.50 ≤2.00 ≤0.025 ≤0.020
B320L ≤0.10 ≤0.30 ≤0.80
≤0.025
≤0.020
B420L ≤0.12 ≤0.50 ≤1.50 ≤0.020
B510L ≤0.16 ≤0.50 ≤1.60 ≤0.020
B510DL ≤0.18 ≤0.30 ≤1.60 ≤0.025 ≤0.020
B550L ≤0.16 ≤0.50 ≤1.60 ≤0.025 ≤0.020
B440QZR ≤0.12 ≤0.50 ≤1.30
≤0.025
≤0.020 －
B480QZR ≤0.16 ≤0.50 ≤1.50 ≤0.020
a 为改善钢的性能，根据需要可添加其他合金元素，此时 Alt 的下限不要求。
表 3
牌号
化学成分 a（质量分数） ％
C Si Mn P S Alt 其他
QStE340TM
≤0.12 ≤0.50
≤1.30
≤0.025 ≤0.020 ≥0.015
Nb≤0.09
V≤0.20
Ti≤0.15
QStE380TM ≤1.40
QStE420TM ≤1.50
QStE460TM ≤1.60
QStE500TM ≤1.70
a 为改善钢的性能，根据需要可添加 Nb、V、Ti 中一种或几种合金元素，但 Nb+V+Ti≤0.22%