structural steel plate for bridge-k8凯发官网
structural steel plate for bridge
1 main use
it is mainly used for making bridge steel structures such as road bridges, railway bridges, sea bridges, overpasses, viaducts and large mechanical bridge cranes for riveting and bolt-welding structures. e-class bridge steel is suitable for bridge structures with low temperature and cold environment or with dynamic loads and very complicated structural members.
2 grades and standards or agreements
grade q345qc/d/e; standard: gb/t 714-2015
grade q370qc/d/e; standard: gb/t 714-2015
grade q420qc/d/e; standard: gb/t 714-2015
3 technical conditions of supply
3.1 product specifications
6～100×1800～4000×lmm
3.2 chemical composition
chemical composition %
牌号 | c≤ | si≤ | mn | p≤ | s≤ | als | cev≤ | 备注 |
q345qc | 0.20 | 0.55 | 0.90～1.70 | 0.030 | 0.025 | / | 0.42 | 添加适量微合金化元素 |
q345qd | 0.18 | 0.55 | 0.90～1.70 | 0.025 | 0.020 | ≥0.015 | ||
q345qe | 0.18 | 0.55 | 0.90～1.70 | 0.020 | 0.010 | ≥0.015 | ||
q370qc | 0.18 | 0.55 | 1.00～1.70 | 0.030 | 0.025 | / | 0.43 | |
q370qd | 0.18 | 0.55 | 1.00～1.70 | 0.025 | 0.020 | ≥0.015 | ||
q370qe | 0.18 | 0.55 | 1.00～1.70 | 0.020 | 0.010 | ≥0.015 | ||
q420qc | 0.18 | 0.55 | 1.00～1.70 | 0.030 | 0.025 | / | 0.44 | |
q420qd | 0.18 | 0.55 | 1.00～1.70 | 0.025 | 0.020 | ≥0.015 | ||
q420qe | 0.18 | 0.55 | 1.00～1.70 | 0.020 | 0.010 | ≥0.015 |
3.3 mechanical properties
牌号 | 屈服强度 rel,mpa, ≥ | 抗拉强度 rm,mpa,≥ | 伸长率， a,%≥ | 纵向冲击功（纵向）,≥ | 180°冷弯试验 | |||
≤50mm | ＞50mm | 温度℃ | j | ≤16 | ＞16 | |||
q345qc | 345 | 335 | 490 | 20 | 0 | 47 | d=2a | d=3a |
q345qd | 345 | 335 | 490 | 20 | -20 | 47 | d=2a | d=3a |
q345qe | 345 | 335 | 490 | 20 | -40 | 47 | d=2a | d=3a |
q370qc | 370 | 360 | 510 | 20 | 0 | 47 | d=2a | d=3a |
q370qd | 370 | 360 | 510 | 20 | -20 | 47 | d=2a | d=3a |
q370qe | 370 | 360 | 510 | 20 | -40 | 47 | d=2a | d=3a |
q420qc | 420 | 410 | 540 | 19 | 0 | 47 | d=2a | d=3a |
q420qd | 420 | 410 | 540 | 19 | -20 | 47 | d=2a | d=3a |
q420qe | 420 | 410 | 540 | 19 | -40 | 47 | d=2a | d=3a |