Effects of Heat Treatment Process Parameters on Microstructure and Mechanical Properties of DP440Cold Rolled Strip

In order to optimize the production process, improve the production efficiency and accelerate the development and application of the domestic dual-phase steel, the effects of heat treatment process parameters on microstructure and mechanical properties of DP440 cold rolled strip were studied by the CAS-300 simulated continuous annealing equipment. When the heating rate increased from 5 to 100 ℃/s, both the tensile strength and yield strength increased because of the decreased grain size. When the intercritical annealing temperature increased from 780 to 850 ℃, the martensite content decreased so that the tensile strength decreased first, then increased, and the yield strength increased. When the rapid cooling rate increased from 25 to 100 ℃/s, because the martensite content increased, the tensile strength increased, while the yield strength decreased. When the overaging temperature increased from 260 to 400 ℃, the tensile strength decreased, while the yield strength increased. When the overaging time increased from 240 to 480 s, the tensile strength decreased a little, while the yield strength increased a little.     

冷轧SUS301和SUS304不锈钢表面硬度控制工艺优化研究

基于具体生产机组设备和工艺条件,对SUS301和SUS304硬态不锈钢的冷轧生产工艺规程和工艺参数进行了研究,分析确定了硬态不锈钢生产过程中表面硬度的相关工艺参数,提出了针对硬态不锈钢生产的冷轧工艺规程调整方法,并利用BP神经网络建立了压下率设定模型,建立了宝新公司自有的硬态不锈钢表面硬度的工艺控制技术。相关技术应用于实际生产后,SUS301和SUS304硬态不锈钢产品的表面硬度控制精度明显提高。     

精密不锈钢带冷轧生产工艺

介绍了精密不锈钢带的生产工艺,并对森吉米尔20辊轧机的某些先进技术作了详细的描述,指出精密不锈钢带冷轧生产工艺是目前较为先进的一项冷轧技术。     

双辊铸轧704不锈钢薄带的冷轧实验

对双辊铸轧704不锈钢薄带进行了冷轧处理,分析了冷轧前后薄带的表面质量及显微组织.结果表明:在冷轧过程中,因动态再结晶和动态回复,使薄带的晶粒进一步得到细化.变形量过大时,冷轧薄带内部出现微观晶界裂纹,并随着变形量的增加最终发展成宏观裂纹.笔者还应用金属学、结晶热力学对晶界裂纹的产生机理进行了分析,认为当冷轧变形量达到一定程度后必须对薄带进行固溶处理,以避免裂纹出现.另外,结合冷轧过程中薄带板形的变化,对704不锈钢铸轧薄带给出了合理的冷轧变形量.     

冷轧带钢边部横向划伤缺陷原因分析

冷轧带钢表面划伤问题是冷轧生产中经常遇到的技术性难题。介绍了攀钢冷连轧机生产过程中的带钢边部横向划伤现象,分析了横向划伤产生的原因,采取了相应的对策措施,成功解决了带钢边部横向划伤的难题。     

Cr Release from Stainless Steels

Cr release from stainless steels in different simulant fluids according to different test conditions is carried out with emphasis on ferritic stainless steels. Effects of Cr content and surface roughness on Cr release are discussed specially with a relation to corrosion resistant and passive film formation. Some primary results are attained： （1） higher Cr content means better corrosion resistance including higher potential and lower corrosion rate and less amount of Cr release from base metal; （2） decreasing surface roughness is in favor of the formation of passive film which can re- train Cr release from base metal effectively; （3） Cr content and surface roughness have synthetical effects on Cr release with a narrow innoxious field referring to surface roughness with decreasing Cr content in stainless steels.     

酒钢不锈钢冷轧连续退火炉技术

从不锈钢冷轧退火工艺开始,介绍了酒钢不锈钢冷轧连续退火炉设备特点和生产工艺。     

异步轧制对SUS430铁素体不锈钢织构和深冲性能的影响

利用X射线衍射技术和金相显微镜观察等手段,研究异步轧制工艺对SUS430铁素体不锈钢组织织构与深冲性能的影响。结果表明:异步轧制技术可以适当细化再结晶晶粒,但是晶粒大小、分布不均匀。织构分析表明,采用异步一次冷轧工艺沿着板厚方向可获得均匀、完整的γ纤维织构,但强度相对较弱,而应用异步二次冷轧,经过两次退火工艺,再结晶织构弱化,获得接近随机的取向织构。综合分析表明,异步一次轧制有利于提高材料的深冲性能。     

不锈钢超滤膜在处理太钢冷轧乳化液废水中的应用

就太钢冷轧含油废水采用最新的不锈钢超滤膜过滤技术处理乳化液废水的工艺设备情况进行了介绍。乳化液废水是冷轧废水中最难处理的废水,其含油量高,有机物含量高,对下游水体污染严重,是冶金工业废水环保外排中急需解决的难题。     

SUS430不锈钢外筒裂纹成因分析

通过对洗衣机外筒缺陷样品的化学成分、金相组织检测以及断口能谱分析，讨论了用SUS430铁素体不锈钢制作洗衣机外筒产生裂纹的原因；指出了外筒开裂为材料中氮质量分数较高而导致晶界存在较多第2相所致；并分析了氮质量分数较高的原因。     

SUS430不锈钢外筒裂纹成因分析

通过对洗衣机外筒缺陷样品的化学成分、金相组织检测以及断口能谱分析,讨论了用SUS430铁素体不锈钢制作洗衣机外筒产生裂纹的原因;指出了外筒开裂为材料中氮质量分数较高而导致晶界存在较多第2相所致;并分析了氮质量分数较高的原因。