批發(fā)國標Q390低合金高強度結(jié)構(gòu)鋼管,Q240鋼帶等
簡介
化學(xué)成分
等級 | C | Mn | Si | P | S | V | Nb | Ti | Al | Cr | Ni |
A | ≤0.20 | 1.00~1.60 | ≤0.55 | ≤0.045 | ≤0.045 | 0.02~0.20 | 0.015~0.060 | 0.02~0.20 | - | ≤0.30 | ≤0.70 |
B | ≤0.20 | 1.00~1.60 | ≤0.55 | ≤0.040 | ≤0.040 | 0.02~0.20 | 0.015~0.060 | 0.02~0.20 | - | ≤0.30 | ≤0.70 |
C | ≤0.20 | 1.00~1.60 | ≤0.55 | ≤0.035 | ≤0.035 | 0.02~0.20 | 0.015~0.060 | 0.02~0.20 | ≥0.015 | ≤0.30 | ≤0.70 |
D | ≤0.20 | 1.00~1.60 | ≤0.55 | ≤0.030 | ≤0.030 | 0.02~0.20 | 0.015~0.060 | 0.02~0.20 | ≥0.015 | ≤0.30 | ≤0.70 |
E | ≤0.20 | 1.00~1.60 | ≤0.55 | ≤0.025 | ≤0.025 | 0.02~0.20 | 0.015~0.060 | 0.02~0.20 | ≥0.015 | ≤0.30 | ≤0.70 |
力學(xué)性能
等級 | δ5/% |
A | ≥19 |
B | ≥19 |
C | ≥20 |
D | ≥20 |
E | ≥20 |
厚度(直徑、邊長)/mm | ≤16 | >16~35 | >35~50 | >50~100 |
σs/MPa | ≥390 | ≥370 | ≥350 | ≥330 |
等級¦溫度 | +20℃ | 0℃ | -20℃ | -40℃ |
A | ||||
B | ≥34 | |||
C | ≥34 | |||
D | ≥34 | |||
E | ≥27 |
主要特性