最新高强度冷轧钢板

最新高强度冷轧钢板［日］濑户一洋等１前言７０年代的石油危机，迫使人们在减少ＣＯ２的排放量、降低燃料费用、减轻汽车车体重量方面作了很多努力。这一时期，高强度钢板取得了长足的进步，如加Ｐ的固溶强化钢、利用Ｔｉ、Ｎｂ等的析出强化钢、大幅度改善延展性的复合组...     

钛对高强度Nb+Ti-IF冷轧罩式炉退火钢板性能的影响

研究了钛（铌固定）对高强度Ｎｂ＋Ｔｉ－ＩＦ冷轧罩式炉退火钢板性能的影响。结果表明，当Ｔｉ／Ｎ≈１（原子比）时伸长率和ｒｍ值最高，随着钛含量的进一步增加，钢中过剩的钛将和磷形成ＦｅＴｉＰ析出相，延迟了再结晶，使伸长率和ｒｍ值降低。     

表面处理对钢板与环氧树脂粘结性能的影响

通过机械划痕、酸洗和磷化三种表面处理的方法对钢板进行物理和化学处理,研究了不同处理方法对钢板与环氧树脂粘结强度的影响。利用表面粗糙度轮廓仪、光学显微镜和SEM扫描电镜对钢板表面形貌和环氧树脂的涂覆效果进行研究。结果表明:钢板表面腐蚀坑的形状、分布、粗糙度是影响其与环氧树脂粘结强度的主要因素。通过比较,酸洗处理25 min的试样粘结强度提高最大,较未处理的样品提高了169%。     

而高温高强度热镀锌钢板

由于火焰温度降低钢材强度，由钢框架结构构成的防火屋顶必须具备防火屏蔽涂层，然而，从生产技术、制造时间及喷镀和涂抹抹屏蔽的工作环境上考虑，竭力要求省去涂抹防火屏蔽。保持高温钢板的性能并优于用于层顶的传统钢板的而高温高强度热镀锌钢板的开发使生产无须增加防火屏蔽处理防火屋顶成为可能。     

成分对超低碳高强度烘烤硬化钢板性能的影响

研究了Ｐ、Ｔｉ，Ｃ，Ｎ等元素对超低碳高强度烘烤硬化（ＢＨ）钢板的强度、塑性和烘烤硬化值的影响，结果可见，Ｃ０．００４％，Ｎ０．００４７％，Ｐ０．０９４％，Ｔｉ０．０１７％的钢板具有较好的综合性能。     

冷轧钢板的表面形貌及评价方法

本文综述、讨论了塑性成形过程中冷轧钢板表面形貌与摩擦及损伤的关系。理论分析表明:摩擦系数的大小与板面凹坑深度的平方成比例;凹坑分布的不均匀将造成摩擦力分布的不均;板面上的硬质点,尖峰和脆性氧化物等会造成表面划伤,从而影响成形件的表面质量。文中还结合冷轧钢板的实际情况介绍了几个定量描述表面形貌的粗糙度指标。     

Textures and Properties of Hot Rolled High Strength Ti-IF Steels

The texture evolution in a high strength Ti-IF steel during the processing of hot rolling, cold rolling, and annealing is studied. For comparison, both ferrite rolling and austenite rolling are employed. It is found that the texture type is the. same after ferrite rolling and austenite rolling, but the texture intensity is much higher in the ferrite rolled sample. Furthermore, texture characteristics at the surface are absolutely different from those at the mid sec tion in both ferrite rolled and austenite rolled samples, as well as under the cold rolled and annealed conditions. The shear texture { 110 } 〈001 〉 disappears and orientation rotates along { 110 } 〈001 〉→ { 554 } 〈 225 〉→ { 111 } 〈 112 〉→{111}〈110〉→{223}〈110〉 during cold rolling. Compared to the austenite rolled sample, the properties of the cold rolled and annealed sheet which is subjected to ferrite rolling are higher.     

Advanced Cold Rolled Steels for Automotive Applications

Advanced high‐strength steels offer a great potential for the further development of automobile bodies‐in‐white due to their combined mechanical properties of high formability and strength. They represent the first choice in material selection for strength and crash‐relevant parts with challenging geometries. The intensive development of multiphase steels by ThyssenKrupp Steel has led to hot dip galvanizing concepts with an outstanding forming potential. Hot rolled, hot dip galvanized complex‐phase steels are currently produced in addition to cold rolled dual phase (DP) and retained austenite (RA) or transformation induced plasticity (TRIP) steels. New continuously annealed grades of steel are being developed with tensile strength levels of up to 1000 MPa in combination with sufficient ductility for the high demands of structural automobile components. These steels make use of the classic advantages of microalloying as well as the principles of DP steels and RA / TRIP steels. Further improvement of properties will be reached by the new class of high manganese alloyed steels.     

高屈服点高强度10MnTiNb冷轧板性能研究

阐述了合金元素在10MnTiNb微合金化高屈服点高强度冷轧板中的作用.通过成分设计,热轧、冷轧工艺控制,对该钢的组织性能进行了研究.     

武钢冷轧电工钢牌号探讨

通过对电工钢牌号的历史演变和现在国家标准、武钢企业标准、技术协议中采用的电工钢牌号的探讨,认为,钢的牌号(钢号)应依照GB/T 2 2 1 -2 0 0 0“钢铁产品牌号表示方法”规定的原则确定,牌号要简单明了,物理意义明确,这样,才能促进经济技术的发展、货物的流通和贸易。     

冷轧镀锌板表面线状缺陷分析

采用光学显微镜、扫描电镜、能谱仪等对冷轧钢板表面和镀锌钢板表面的线状缺陷进行了研究分析.认为连铸坯中的气泡、夹杂和轧制过程中氧化铁皮的压人是形成冷轧板表面线状缺陷的主要原因,并分别指出了由上述原因引起的缺陷各自的主要形貌特征.     

高强深冲冷轧170P1板的试验研究

以高强IF钢(170P1)为研究对象,采用2种不同热轧工艺(常规热轧工艺、铁素体区热轧工艺)及随后相同的冷轧工艺、罩式炉退火及平整工艺进行了工业试制,试制结果表明:采用铁素体区热轧工艺,热轧板预退火及冷轧后,利用罩式炉退火就可保证高强IF钢的r值达2.1,采用这一工艺生产的高强IF钢板在汽车厂生产翼子板等难冲件时合格率可达100%.     

Effects of Coiling Temperature on Strength,Yield Ratio and Precipitation Behaviors of Hot Rolled High Strength Microalloyed Steel for Cold Forming

Various hot rolling schedules were applied to a Nb,V,Ti contained HSLA steel.Coiling temperature had crucial effects on not only yield strength,but also yield ratio and precipitation behavior.600Mpa yield strength is achieved when coiled at 450℃,which is 100Mpa higher than those coiled at 570℃.However,the low coiling temperature had adverse effect to increase yield ratio,which increased from 0.78 to 0.88 as coiling temperature dropped from 570℃ to 450℃.High resolution SEM analysis shows that sizes of Nb,V,Ti precipitates are affected by coiling temperature.Coarse (Nb,Ti)(C,N) precipitates up to 5μm are observed at higher coiling temperature and to decrease tensile strength,where high coiling temperature corresponds to low cooling rate.With strong cooling and coiling capacity of Shasteel’s 1450mm width hot rolling mill,these results indicate that strength and formability of the steel can be balanced when coiling temperature has been optimized.Alloying and microalloying costs can be reduced by efficiently utilizing the capacity of rolling mill.Alumina inclusions are found to act as nucleus for Nb,V,Ti precipitates,contributing to coarsening of precipitates.     

Heredity Characteristic From Hot Rolled Microstructure to Annealed Microstructure in High Strength TRIP Steels

 The influence of hot-rolled process on microstructure in TRIP steel and the heredity characteristic from the hot-rolled microstructure to annealed microstructure are investigated. The results show there are two kind of hot-rolled microstructures under different coiling temperatures. One is composed of coarse grains of ferrite, pearlite and bainite, and the other is composed of small grains of ferrite, bainite and austenite. After annealing, the first kind of hot-rolled microstructure is greatly refined, and volume fraction, carbon content of austenite increase significantly. However, it have little changes in grain size, volume fraction and carbon content of austenite after the second kind of hot-rolled sheet is annealed. There are also differences in distribution of retained austenite between the two annealed microstructures observed by EBSD and TEM technology. Retained austenite in the first annealed microstructure distributes mainly inside of the polygonal ferrite in the form of spot, only little retained austenite on bainte ferrite boundary, however retained austenite in the second annealing microstructure allocates several places, such as inside of polygonal ferrite, on polygonal ferrite boundary, on bainte ferrite boundary.     

高表面质量带钢轧辊磨削工艺研究

轧辊磨削是影响带钢表面质量的关键工艺过程,磨削工艺优化需考虑磨削程序架构和关键参数两个方面与磨削效果之间的关系.文章结合高表面质量带钢对轧辊磨削过程的要求,从实际生产出发明确了磨削工艺的调整原则.分析了磨削程序、参数设置对轧辊表面质量的影响特点,发现程序架构是影响轧辊磨削质量的主要原因.研究结果对冷轧带钢轧辊磨削具有指导意义.     

Effects of Process Parameters prior to Annealing on the Formability of Two Cold Rolled Dual Phase Steels

This study concerns the effects of coiling temperature after hot rolling and the degree of reduction during cold rolling on formability‐related properties of high strength cold rolled dual phase (DP) steels. The effect of coiling temperature on the final structure and properties of two cold rolled and annealed DP‐steels is investigated. Further, the effect of cold rolling reduction and its impact on the final properties of the material is studied. Aspects of the impact of the different process parameters on the ferrite to austenite and austenite to martensite transformation are discussed based on results from production scale experiments, tensile testing and metallographic examinations of the materials.