共查询到19条相似文献,搜索用时 125 毫秒
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介绍了沙钢100 t EAF-LF-150 mm×150 mm CC-CR流程生产的免球化退火硼钢、省略球化退火和倜质处理工艺的冷作硬化非调质钢、在线软化冷镦钢和超高强度紧固件用钢等节能冷镦钢新产品的进展。文中对各钢种的组织、力学性能、淬透性、冷镦性能进行了分析,用户对节能冷镦钢的使用效果良好。 相似文献
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冷镦钢产品顶锻开裂的机理分析及应用 总被引:1,自引:0,他引:1
冷镦钢是用于制造螺栓、螺母、铆钉、插销等紧固件的一种重要功能材料,冷镦性能是材料性能的重要指标。冷镦钢在冷顶锻检验时,顶锻开裂的现象可以归纳为周面脆性开裂、塑性斜向开裂、断续纵向微裂、通长纵向开裂四类主要开裂现象。本文根据断裂力学理论,结合顶锻试样开裂的不同表现,对试样不同开裂情况进行了理论研究.分析了各种开裂现象的产生机理,并据此制定了生产过程中提高冷镦钢冷顶锻性能的相关措施。 相似文献
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冷镦钢的生产发展综述 总被引:1,自引:0,他引:1
本文介绍了近年来我国冷镦钢的开发和生产情况,钢水化学成分对冷镦性能的影响.各种牌号冷镦钢的化学成分;针对需要提供了生产ML35冷镦钢冶炼、连铸、轧制的详细数据.及质量热点问题。目的是提供冷镦钢有关的有用知识。 相似文献
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一、绪言低强度紧固件是冷镦成型,变形量较大,变形速度较高。因而要求钢材不但要有一定的使用强度,而且还要求较高的塑性指标。只有这样才能确保材料冷镦变形的需要。目前国内一般常用普通碳素铆螺钢和优质碳素冷镦钢两个钢种。二者相比后者性能优越,但一般氧气顶吹转炉不易冶炼。我厂借鉴首钢制定的质量介于冷镦钢与铆螺钢之间的低强度紧固件用钢的企 相似文献
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LI Zhuang 《钢铁研究学报(英文版)》2009,16(3):43-48
Thermomechanical controlled processing (TMCP) of low carbon cold heading steel in different austenite conditions were conducted by a laboratory hot rolling mill.Effect of various processing parameters on the mechanical properties of the steel was investigated.The results showed that the mechanical properties of the low carbon cold heading steel could be significantly improved by TMCP without heat treatment.The improvement of mechanical properties can be attributed mainly to the ferrite grain refinement due to low temperature rolling.In the experiments the better ultimate tensile strength and ductility are obtained by lowering finishing cooling temperature within the temperature range from 650 ℃ to 550 ℃ since the interlamellar space in pearlite colonies become smaller.Good mechanical properties can be obtained in a proper austenite condition and thermomechanical processing parameter.The ferrite morphology has a more pronounced effect on the mechanical behavior than refinement of the microstructure.It is possible to realize the replacement of medium-carbon by low-carbon for 490 Mpa grade cold heading steel with TMCP. 相似文献
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介绍宝钢分公司炼钢厂电炉分厂两条工艺路径的特点,一条是EAF LF CCM,主要满足钢水的脱氧和脱硫要求;另一条是EAF LF VD CCM,主要满足钢水的脱氧、脱硫、脱氢和脱氮要求.VD的功能主要是通过真空技术,去除钢水中的气体含量.通过两种精炼工艺的对比试验,分析了冷镦钢线材性能时效差异的原因,认为钢中含氢量是重要因素,但随着时间的延长不会对冷镦钢线材性能造成不良后果,并提出产线工艺路径优化的设想. 相似文献
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SAE1008冷镦钢要求具有很高的洁净度和良好的冷成型性,其屈强比在0.5-0.65之间,断面收缩率在50%以上。天铁炼钢厂通过对冷镦钢生产工艺过程和产品质量的跟踪分析,确定了关键工艺和相应参数。优化改进冷镦钢炼钢、连铸工艺参数后,使盘条质量得到大幅度提高,满足了用户的要求。 相似文献
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Effects of rolling and cooling conditions on microstructure and mechanical properties of low carbon cold heading steel were investigated on a laboratory hot rolling mill. The results have shown that the mechanical properties of low carbon steels exceed the standard requirements of ML30, ML35, ML40, and ML45 steel, respectively due to thermomechanical controlled processing (TMCP). This is attributed to a significant amount of pearlite and the ferrite-grain refinement. Under the condition of relatively low temperature rolling, the mechanical properties exceed standard requirements of ML45 and ML30 steel after water cooling and air cooling, respectively. Fast cooling which leads to more pearlite and finer ferrite grains is more critical than finish rolling temperatures for low carbon cold heading steel. The specimen at high finish rolling temperature exhibits very good mechanical properties due to fast cooling. This result has great significance not only for energy saving and emission reduction, but also for low-carbon economy, because the goals of the replacement of medium-carbon by low-carbon are achieved with TMCP. 相似文献
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利用转炉冶炼生产ML08Al冷镦钢,生产过程中通过冶炼工艺的优化,改善了钢中非金属夹杂物的形态和行为,提高了钢的质量。同时还特别对连铸坯进行了必要的检测分析,并对ML08Al冷镦钢连铸坯中非金属夹杂物的形态与行为做了深人的研究。提出了改善产品质量的措施和提高钢的纯净度的手段和方法。 相似文献
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