low carbon bainite high strength structural steel plate (70-九游会亚洲
low carbon bainite high strength structural steel plate (70-80kg grade)
1 main use
this product is a low carbon bainitic steel with yield strength of 500, 550, 620 and 690 mpa. it has high strength, high toughness and excellent welding performance. it is suitable for all kinds of construction machinery, large electric shovel, bulldozer, dump truck, oil and gas pipeline. , drilling platforms, drilling rigs and coal mining machinery (hydraulic supports, scraper conveyors).
2 grades and standards
q500c/d/e gb/t1591-2008 "low alloy high strength structural steel"
q550c/d/e gb/t1591-2008 "low alloy high strength structural steel"
q620 c/d/e gb/t16270-2009 "high-strength structural quenched and tempered steel plate"
q690c/d/e gb/t16270-2009 "quenched and tempered steel plate for high strength structure"
jg670db protocol: jgx359-2009 "jg670db high strength steel plate technology agreement"
jg785db protocol: jgx410-2009 "jg785db high strength steel plate technology agreement"
3 technical conditions of supply
3.1 product specifications
6～200×2000～3800×6000～12000mm
3.2 chemical composition
化学成分 %
牌号 | c | si | mn | p | s | 其它微合金等 | cev | pcm |
q500c/d/e | ≤0.18 | ≤0.60 | ≤1.80 | ≤0.025 | ≤0.020 | 适量 | ≤0.47 | / |
jg670db | ≤0.21 | ≤0.55 | ≤1.80 | ≤0.025 | ≤0.020 | 适量 | / | / |
q550c/d/e | ≤0.18 | ≤0.60 | ≤2.00 | ≤0.025 | ≤0.020 | 适量 | ≤0.47 | / |
q620c/d/e | ≤0.18 | ≤0.60 | ≤2.00 | ≤0.025 | ≤0.020 | 适量 | ≤0.48 | / |
jg785db | ≤0.21 | ≤0.55 | ≤1.80 | ≤0.025 | ≤0.020 | 适量 | / | / |
q690c/d/e | ≤0.18 | ≤0.60 | ≤2.00 | ≤0.025 | ≤0.020 | 适量 | ≤0.49 | / |
3.3 力学性能
牌号 | 规格 mm | rp0.2，mpa | rm，mpa | a，% | 180°弯曲试验，弯心半径d | 夏比冲击试验，纵向 | |
试验温度 ℃ | kv2 ，j | ||||||
q500c/d/e | ≤16 | ≥500 | 610～770 | ≥17 | / | （c ）0 （d ）-20 （e ）-40 | ≥55 ≥47 ≥31 |
＞16～40 | ≥480 | ||||||
＞40～63 | ≥470 | 600～760 | |||||
＞63～80 | ≥450 | 590～750 | |||||
jg670db | 8～16 | ≥550 | 670～830 | ≥14 | d=3a | 0 | ≥34 |
＞16～80 | ≥530 | ||||||
q550c/d/e | ≤16 | ≥550 | 670～830 | ≥16 | / | （c ）0 （d ）-20 （e ）-40 | ≥55 ≥47 ≥31 |
＞16～40 | ≥530 | ||||||
＞40～63 | ≥520 | 620～810 | |||||
＞63～80 | ≥500 | 600～790 | |||||
q620c/d/e | ≤16 | ≥620 | 710～880 | ≥15 | / | （c ）0 （d ）-20 （e ）-40 | ≥55 ≥47 ≥31 |
＞16～40 | ≥600 | ||||||
＞40～63 | ≥590 | 690～880 | |||||
＞63～80 | ≥570 | 670～860 | |||||
jg785db | ≤50 | ≥690 | 770～940 | a50≥14 | d=3a | 0 | ≥40 |
＞50～80 | ≥670 | ||||||