攀钢家电用冷轧钢板的开发应用与展望

简要介绍了攀枝花钢铁（集团）公司家电用冷轧板的生产工艺，品种规格，以及发展前景，并介绍了攀钢将建成为我国多品种、高质量家电用冷轧板生产基地所拟建的技改和建设项目。     

冷轧汽车钢板发展动态

叙述近年来国外汽车用冷轧钢板的发展态势,着重介绍深冲级冷轧钢板,高强度钢板和涂镀层表面处理钢板生产工艺和性能改善方面的作用,以及汽车工业对这些钢板性能要求和应用的变化情况。     

两种类型冷轧钢板的耐蚀性比较

采用工业大气挂片法、电化学方法、俄歇电子能谱法、辉光放电光谱分析法等对两种不同类型冷轧钢板:超低碳非高强钢A与高强钢B表面耐蚀性能进行了对比研究,并对锈蚀机理进行了探讨。结果表明,在相同试验条件下超低碳非高强钢A的表面耐蚀性能优于高强钢B;高强钢B表面Mn元素的富集程度明显高于非高强钢A表面,其表面分布有许多小颗粒,以Mn的氧化物形式存在。     

冷轧钢板和热轧钢板防锈液的研制

利用正交试验和加速腐蚀实验成功研制出适合于冷轧钢板和热轧钢板的两种防锈液，经实验测试其性能优于现有的钢铁防锈液。     

冷轧航空管生产工艺浅析

简介了长城特殊钢公司第一钢厂20A、30CrMnSiA钢航空管生产工艺和要点,以及生产过程中主要工序易出现的质量问题。     

提高2Cr13Ni4Mn9冷轧钢板的可塑性

为保证2Cr13Ni4Mn9冷轧奥氏体不锈钢板冷变形工艺的顺利实现,本文研究了该状态钢板的可塑性(ψb)。结果表明,冷变形前通过250℃×6h退火处理,其可塑性可大幅度提高,从而为获得合格的冷变形加工制品提供了充分条件。     

高强低合金钢H420LA表面条斑缺陷成因分析

针对高强低合金钢H420LA退火带钢表面存在的暗色条斑缺陷,采用SEM、EDX等手段对带钢表面正常区及条斑区进行了微观结构对比分析,并追溯了热轧态及模拟酸洗后带钢表面不同区域的宏观及微观形貌差别。结果表明：H420LA热轧带钢表面红锈缺陷可遗传演变为退火成品的表面条斑。通过对红锈缺陷的微观结构及其成因分析,提出了提高出炉温度、增加粗轧除鳞道次的工艺措施,有效地减少了H420LA热轧卷表面的红锈缺陷,冷轧成品表面质量因此得到改善。     

Warm and hot punching of ultra high strength steel sheet

Warm and hot punching using resistance heating was developed to improve the quality of sheared edges of an ultra high strength steel sheet. As the heating temperature increased, the depth of the shiny burnished surface on the sheared edge increased and that of the rough fracture surface decreased. The rollover depth and burr height of the sheared edge became large above 800 °C. Although the roughness of the burnished surface was almost constant, the roughness of the fracture surface increased from 650 °C. The punching load was extremely reduced by the heating, i.e. 40% of the cold punching load at 650 °C and 15% at 1070 °C. The local resistance heating of the shearing region was efficient for the warm and hot shearing. It was found that the warm and hot shearing of ultra high strength steel sheets is effective for improving the quality of the sheared edge and in reducing the shearing load.     

工艺参数对板料成形性能的影响

传统上，人们对于工艺参数对板料成形性能的影响的认识只是定性的。利用板料成形的计算机数值模拟技术，可以定量地考察各种工艺参数对板料成形性能的影响。     

轧制42CrMo钢高强度螺栓的热处理

轧制42CrMo钢通常为制造要求强度高、塑性和韧性指标也较高的关键部位螺栓的首选材料之一。由于材料内部原始组织的不均匀性等特点,采用常规的调质工艺,在满足高强度的基础上,其塑性和韧性指标往往达不到技术要求。通过采用双液淬火的调质工艺,成功地生产了轧制42CrMo钢高强度螺栓。     

国内外酸洗热轧板的生产及发展

介绍国内外酸洗热轧板的生产及发展,并就我国当前酸洗热轧板的发展谈了几点认识。     

冷连轧高强钢工艺优化

针对轧制45钢、50钢等钢种过程中咬入困难、带钢发生跑偏、出现轧漏、不能提速而影响生产效率等问题,分析了其原因,通过轧制策略、张力偏差、板形预设定参数、轧机自学习功能的优化,实现了45钢、50钢的稳定轧制,减少了轧制过程中1#机架带钢跑偏的概率,轧制速度提高至500 m/min。     

Prediction of the yield strength of a secondary-hardening steel

Based on detailed three-dimensional (3-D) local-electrode atom-probe (LEAP) tomographic measurements of the properties of Cu and M₂C precipitates, the yield strength of a high-toughness secondary-hardening steel, BA160, as a function of aging time is predicted using a newly developed 3-D yield strength model. Contributions from each strengthening constituent are evaluated with the model, and superposition laws are applied to add each contribution. Prediction of the yield strength based entirely on 3-D microstructural information is thus achieved. The accuracy of the prediction depends on the superposition laws and the LEAP tomographic measurements, especially the mean radius and volume fraction of M₂C precipitates.     

轧制工艺对超高强钢组织与力学性能的影响

通过组织观察及性能测试研究了轧制工艺对超高强钢组织与力学性能的影响。结果表明,在再结晶区轧制后直接淬火和回火,组织中马氏体板条尺寸较大;再结晶区+未再结晶区轧制后直接淬火和回火后,组织细小、均匀,大角度晶界所占比例更高,马氏体板条束尺寸减小,钢的强韧性更好。     

Development of ultra high performance concrete dies for sheet metal hydroforming

The paper concentrates on investigation results dealing with ultra high performance concrete (UHPC) dies for the use in sheet metal hydroforming. A special mixture of UHPC for these tools with its mechanical properties and its manufacturing is presented. The developed UHPC features a compressive strength of approx. 250 MPa and a Young’s modulus of approx. 50 GPa. Applying internal pressure, the UHPC die (without confinement or reinforcement) failed between 80 and 96 MPa. The forming test proved a good shape accuracy of the sheet metal parts but revealed critical tribological conditions. Drawing foil and already formed sheet metal parts were tested successfully as interlayer and led to an appropriate material flow and surface quality of the sheet metal parts.