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The 550 MPa grade hot rolled axle housing test steel is rolled in laboratory with the design of medium carbon content+micro alloy Nb and Ti as well as controlled rolling and controlled cooling process. The results showed that the effects of adding moderate rare earth Ce into test steel on its microstructure and strength were not obvious, rare earth Ce reduced the grade of inclusion (class B) in test steel, low temperature impact energy of test steel with rare earth was obviously better than that of test steel without rare earth and fatigue property of axle housing test steel was improved by rare earth Ce.

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采用中碳含量+微合金Nb、Ti设计以及控轧控冷工艺在实验室轧制出屈服强度550 MPa级热轧桥壳试验钢。研究结果表明,试验钢中加入适量稀土Ce元素,对钢的组织及强度影响不明显,稀土Ce降低了试验钢B类夹杂物的评级,加稀土试验钢低温冲击功明显优于不加稀土试验钢的冲击功,稀土Ce改善了桥壳试验钢的疲劳性能。

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郭冬青(1988-),女,内蒙古乌兰察布市人,硕士,高级工程师,现从事板带材新产品研发工作。

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郭冬青(1988-),女,内蒙古乌兰察布市人,硕士,高级工程师,现从事板带材新产品研发工作。

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牌号	C	Si	Mn	P	S	Al	Nb	Ti	Ce
550QK	0.18~0.20	≤0.030	1.40~1.50	≤0.018	≤0.006	0.020~0.050	0.045~0.055	0.015~0.025
550QK-RE	0.18~0.20	≤0.030	1.40~1.50	≤0.018	≤0.006	0.020~0.050	0.045~0.055	0.015~0.025	0.002 0

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550QK、550QK-RE试验钢化学成分(质量分数)%

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牌号	C	Si	Mn	P	S	Al	Nb	Ti	Ce
550QK	0.18~0.20	≤0.030	1.40~1.50	≤0.018	≤0.006	0.020~0.050	0.045~0.055	0.015~0.025
550QK-RE	0.18~0.20	≤0.030	1.40~1.50	≤0.018	≤0.006	0.020~0.050	0.045~0.055	0.015~0.025	0.002 0

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板坯厚度 /mm	加热温度 /℃	加热时间 /h	轧制道次	辊道速度 /(m·s-1)	冷却水开启 组数	终轧温度 /℃	终冷温度 /℃
110	1 200~1 220	4	11	0.55	4	820	450~480

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主要加热轧制冷却工艺

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板坯厚度 /mm	加热温度 /℃	加热时间 /h	轧制道次	辊道速度 /(m·s-1)	冷却水开启 组数	终轧温度 /℃	终冷温度 /℃
110	1 200~1 220	4	11	0.55	4	820	450~480

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牌号	Rel/MPa	Rm/MPa	A/%	180°冷弯(d=1.5a)
550QK	565~577	677~695	20.0~22.5	合格
550QK-RE	550~583	680~706	19.0~21.0	合格
设计要求	≥550	≥600	≥15	合格

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550QK、550QK-RE试验钢力学性能

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牌号	Rel/MPa	Rm/MPa	A/%	180°冷弯(d=1.5a)
550QK	565~577	677~695	20.0~22.5	合格
550QK-RE	550~583	680~706	19.0~21.0	合格
设计要求	≥550	≥600	≥15	合格

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牌号	A	B	C	D	Ds
550QK	0	2.5	0.5	1.0	1.0
550QK-RE	0	1.0	0.5	1.0	1.5

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550QK、550QK-RE试验钢夹杂物级

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牌号	A	B	C	D	Ds
550QK	0	2.5	0.5	1.0	1.0
550QK-RE	0	1.0	0.5	1.0	1.5

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牌号	20 ℃	0 ℃	-20 ℃	-40 ℃	-60 ℃
550QK	194	186	183	150	104
550QK-RE	198	187	192	170	143

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550QK、550QK-RE试验钢系列温度冲击功J

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牌号	20 ℃	0 ℃	-20 ℃	-40 ℃	-60 ℃
550QK	194	186	183	150	104
550QK-RE	198	187	192	170	143

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