low alloy high strength structural steel plate (q420b/c/d)-九游会亚洲
low alloy high strength structural steel plate (q420b/c/d)
1 main use
these products are suitable for welding structural parts of rolling stock, mining equipment, mining machinery, electric motors, boilers, petroleum, chemical, shipbuilding, bridges and other industries and other low-temperature areas.
2 grades and standards
grade q420b/c/d; standard: gb/t 1591-2008 (equivalent to american standard astm a572 gr60, jis g 3106 sm520, etc.)
3 technical conditions of supply
3.1 product specifications
6～200×1800～4000×lmm
3.2 chemical composition
chemical composition %
牌号 | c | mn | si | p | s | nb |
q420b | ≤0.20 | 1.00～1.70 | ≤0.50 | ≤0.035 | ≤0.035 | 0.015～0.060 |
q420c | ≤0.20 | 1.00～1.70 | ≤0.50 | ≤0.030 | ≤0.030 | 0.015～0.060 |
q420d | ≤0.20 | 1.00～1.70 | ≤0.50 | ≤0.030 | ≤0.030 | 0.015～0.060 |
3.3 力学性能
牌号 | 屈服强度 mpa,≥ | 抗拉强度mpa,≥ | 延伸率 a，%,≥ | 冲击功，akv，j纵向 | 180°冷弯 试验 | ||||||||
规格，mm | |||||||||||||
≤16 | ＞16～40 | ＞40～63 | ＞63～80 | 温度 | ≥ | ≤16 | ＞16 | ||||||
≤40 | ＞40-63 | ＞63-80 | |||||||||||
q420b | 420 | 400 | 380 | 360 | 520-680 | 19 | 18 | 18 | 20℃ | 34 | d=2a | d=3a | |
q420c | 420 | 400 | 380 | 360 | 0℃ | 34 | |||||||
q420d | 420 | 400 | 380 | 360 | -20℃ | 34 | |||||||