2、 Mn Si ≤ P ≤ S ≤ V Nb Ti AI ≥ Cr ≤ Ni ≤Q295 A B 0.16 q.16 0.80~1.50 0.80~1.50 O.55 0.550.0450.0400.0450.040 0.02~0.15 0.02~O.150.015~0.0600.015~0.060 0.02~0.20 0.02~0.20-- Q345 A B C D EO.20O.200.20O.18O181.OO~1.60 1.OO~1.60 1.00~I.60 1.OO~1.60 1.OO~1.60 O.55 O.55 O.55 0.55 0.
3、550.0450.0400.0350.0300.0250.0450.0400.0350.0300.0250.02~0.15 0.02~0.15 0.02~0.15 0.02~0.15 0.02~O.150.015~O.0600.015~0.06C0.015~0.0600.015~0.0600.015~0.060 0.02~0.20 O.02~O.20 0.02~0.20 0.02~0.20 0.02~0.20 O.015O.0150.015Q390 A B C D E O.20 O.20 O.20 O.20 O.20 1.OO~1.60 1.OO~1.601.