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首页> 外文会议>Iron Steel Supplement 2005 vol.40: The Joint International Conference of HSLA Steels 2005 and ISUGS 2005 >Effect of Heat Treatment on Microstructure and Mechanical Property of Brake Beam Steel
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Effect of Heat Treatment on Microstructure and Mechanical Property of Brake Beam Steel

机译：热处理对制动梁钢组织和力学性能的影响

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摘要

With the fifth entirely velocity lifting on the railway in China, there are more new requirements on steel used for railway, such as rail, wheel, axle, part and so on. The requirements include high strength, high ductility, high cleanliness and good welding performance. The truck is the key part to restrict the velocity lifting of locomotive. The Railway Ministry of China introduces the most advanced structure of overseas brake beam according to the advanced international standard AAR (the Association of American Railroads). The brake beam steel, a new microalloyed steel to meet the new requirements for lifting velocity of locomotive, has been successfully produced by Shougang and widely used for new composite brake beam for van. The process of manufacturing brake beam is converter-LF-continuous casting-blooming-shaped blank rolling-reheating-drawing- -tempering, and the final property will reach σ_s ≥ 460MPa and A_(kv) (-40°C) ≥ 27J. It is not suitable for the shaped blank to be produced by controlled rolling. To obtain better properties, appropriate chemical composition and heat treatment are needed. In this article, the effect of heat treatments on microstructure and mechanical property of brake beam steel has been studied carefully. The results show that the steel normalized at 930 °C to 1020°C and tempered at 550°C to 700 °C has better combination of strength and ductility and low temperature impact property. There are no quality problems after being used in locomotive for more than one year.
机译：随着中国铁路第五次全速提升，对铁路用钢的新要求也越来越高，例如铁路，车轮，车轴，零件等。要求包括高强度，高延展性，高清洁度和良好的焊接性能。卡车是限制机车速度提升的关键部分。中国铁道部根据先进的国际标准AAR（美国铁路协会）引进了最先进的海外制动梁结构。首钢成功生产了一种满足机车提升速度新要求的新型微合金钢，并广泛用于货车的新型复合制动梁。制动梁的制造过程为转炉-LF-连续浇铸-喷吹形毛坯轧制-加热-拉伸-回火，最终性能达到σ_s≥460MPa，A_（kv）（-40°C）≥27J。不适合通过控制轧制生产异型坯料。为了获得更好的性能，需要适当的化学成分和热处理。本文仔细研究了热处理对制动梁钢组织和力学性能的影响。结果表明，在930°C至1020°C时进行正火，在550°C至700°C的温度下回火的钢具有更好的强度和延展性以及低温冲击性能。机车使用一年以上无质量问题。

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