大壁厚X70管件用管线钢关键技术开发及应用

通过采用低碳、低磷、超低硫及适当微合金化的化学成分设计,结合高洁净度钢冶炼、高质量铸坯生产以及优化后的TMCP过程控制工艺,成功开发出20～35 mm大壁厚X70管件用管线钢,其金相组织为针状铁素体+贝氏体,晶粒细小组织均匀,具有良好的力学性能。     

薄规格X70管件用管线钢冷却工艺对性能影响研究

通过热模拟试验获得X70的CCT曲线和不同冷却速度下的组织,从而确定现场采用3种冷却工艺试验方 案,其中方案2（中等速度冷却）能达到薄规格管件用钢板高强度、高韧性的要求,且钢板板形易于控制,能够实现低 难度的大批量生产。     

尼桑汽车冷镦用钢SCM435盘条的试制

介绍了杭钢试制日本尼桑汽车冷镦用钢SCM435盘条的情况。检测了试制盘条的化学成分、表面质量、金相组织和力学性能等，结果表明均达到了尼桑汽车公司提出的要求。     

高品质工程机械用钢生产工艺优化

工程机械用热轧钢板不仅对产品力学性能要求严格,而且对钢板表面质量要求极为苛刻。南钢从合金成分设计着手,通过控制钢水冶炼过程、降低奥氏体化温度和二次开轧温度,成功获得显微组织由铁素体和珠光体组成,拉伸性能稳定、低温冲击均值高达220 J、晶粒度10级以上无带状组织的高品质工程机械热轧钢板。研究表明：洁净钢冶炼技术提升、低温奥氏体化技术结合低温轧制冷却工艺,减少钢板表面铁橄榄石生成量,钢板表面可形成致密稳定不易破碎的5μm厚度的氧化铁皮,氧化铁皮的存在避免了钢板在运输储存过程中表面的二次破坏,保证了客户使用质量。在满足了工程机械用钢对产品表面及性能的高要求的同时,企业也获得了高品质工程机械用钢的工艺研究成果及成套工业化制造技术。     

饮用水管件用铜合金的研究

为了解决因铋的加入引起的铜合金脆化问题，研究结果表明，通过添加元素Sn、P完全解决了因铋引起的脆化问题，并提出了配方Cu-BilSn3Zn6P0.03。     

热处理制度对液压胀形钛合金管件性能的影响

采用三种不同的热处理制度对液压胀形Ti-Al-V-In新型钛合金薄壁管件进行了热处理,通过力学性能和耐腐蚀性能的测试与对比分析,发现:与常规退火相比,等温退火和超声振动等温退火均能提高管件的力学性能和耐腐蚀性能,尤其是超声振动等温退火的提高效果更为显著,其中抗拉强度增大22%、屈服强度增大32%、断后伸长率增大18%、腐蚀电位正移146 mV、腐蚀电流密度减小71%。该管件的热处理制度优选为超声振动等温退火。超声振动等温退火时,高温段温度、低温段温度和超声振动频率分别优选为:820℃、540℃、35 Hz。     

优化焊缝金相组织 充分发挥石油用 ERW管的技术经济优势

P2ERW管代替无缝管,用于石油开采所用油管和套管的关键,是确保焊缝的高质量。它不仅需要具备先进的技术装备和完善的检测手段,更需要发挥金相检验对优化各项工艺参数的指导作用,才能从根本上掌握生产优质ERW石油用管的规律。     

某厂球墨铸铁管连续退火炉炉用机械设计

本文对我国自行设计、建造的第一座处理ＤＮ１００－１０００ｍｍ球墨铸铁管退火炉炉用机械设计进行了总结。设计中提出了诸多新颖实用的技术手段，经受了投产以来的生产实践经验，取得了良好的效益。     

汽车半轴用钢力学性能不合格的分析与改进

采用电子显微分析、金相组织分析等方法,对汽车半轴用SZA702EC非调质钢力学性能不合格的原因进行了分析。结果表明,钢材下线冷却速度过快是造成力学性能不合的主要原因;有针对性地采取了补救措施后,避免了钢材批量报废。     

玛钢水暖件电镀锌

以CT-2为光亮剂的氯化钾电镀锌在玛钢水暖件上施镀时,其电流效率为95%,镀层光亮细致,其耐蚀性与低碳钢上的镀锌层相近,证明水暧件原材料的成分及其铸态表面缺陷对电镀锌的质量无显著影响,但电镀锌与热浸锌相比可大大降低锌和能量单耗,降低成本,可用电镀锌来代替现行的热浸锌。     

PCH法铜管接头成形技术

采用以PCH为代号的有机混合填料作传压介质,在自制的设备上用PCH法一次冷成形制成各种类型的铜管接头。该方法在很多方面优于国际上先进的液压胀形法及常用的橡胶凸形法。其主要特点是设备及控制系统简单,填料价廉且可反复回用,成本低,产品质量有确切保证。     

影响TC4合金大规格锻棒表面质量和力学性能因素分析及工艺改进

针对TC4合金大规格锻棒生产表面出现大量裂纹,且力学性能不能达到国标要求的问题,分析了影响锻棒表面质量和力学性能的主要因素,提出了通过制定合理的加热工艺并尽量采用电加热炉加热、控制合金的终锻温度≥780℃及控制合金初锻单边压下量≤25 mm来提高棒材的表面质量;通过控制合金的配料为Al 6.4％左右、V4.2％左右、00.1％左右,方坯加热温度在相变点以下10℃至相变点以上5℃,方坯到棒材的变形量在30％以上来改善锻棒的力学性能.采取这些措施后,生产出的大规格TC4合金锻棒表面质量得到了较大改善,且力学性能可达到国标要求.     

Controlling Properties of HSLA Line Pipe Steels for Oil and Gas Applications

DANIELI has recently implemented its Coil Quality Estimator (DANIELI-CQETM) system to the Hot Strip Mill of United Metallurgical Company (OMK) at Vyksa,Russia.This system is developed for the purpose of real time assessment and control of mechanical properties for hot rolled coils.Mechanical properties such as strength,toughness,ductility and hardness are predicted over the entire length of a strip while it is processed.The property estimation is based on the final microstructure as predicted from a group of interconnected physically based metallurgical models,supplemented by Artificial Neural Network.The CQE system is used for prediction and control of properties of HSLA line pipe grades steel and other grades.The system performance,is judged by accuracy and reliability of prediction,has been compared with the physical material testing data from the plant.The results are found to be excellent.CQE is found useful for generation of test certificate of coil,quality assurance,process control,product development,and customer claim assessment.It is used for resource optimization for production,and other operational improvements such as reduction of downgrades.The present paper shares the results of CQE performance for prediction of HSLA line pipe grade steels.     

Investigation on Mechanical Property of Seamless Pipe

The mechanical properties of the steel pipe rolled with continuously casting round billet after determining the chemical composition in steel were studied. The results show that the total reduction ratio should be higher than 5.2 when the line pipes of grade B, grade 20 and other general seamless pipe were rolled with continuously casting round billet. And the total reduction ratio should be higher than 10.2 and the grain size should be controlled more than grade 7 for casing of oil countryside tubular goods (OCTG).     

Y2O3对金属基陶瓷内衬显微组织和力学性能的影响

研究了稀土钇对提高陶瓷复合钢管的表面质量和力学性能的影响。结果表明,加入0.5%(质量分数)的Y_2O_3和2%的SiO_2对改善陶瓷表面质量和提高其力学性能有较好效果。     

Improvement of Mechanical Properties of CrNiMoCuTi Stainless Steel With Addition of Vanadium

 The effect of vanadium (V) addition on the mechanical properties of a Cr Ni Mo Cu Ti stainless steel was studied and its influence on microstructural changes was also investigated. Results indicate that the structure of the solution treated specimens mainly comprises of austenite martensite, and adding V leads to the formation of a considerable amount of ferrite. Under this condition, austenite phase is not mechanically stable, and transforms to martensite by plastic deformation. The addition of 05% - 10% (in mass percent) of V increases the hardness and the strength of the 80% cold rolled and aged steel, without any effect on ductility. Improvement in mechanical properties is presumably attributed to the formation of a small amount of ferrite in the primary structure, and the formation of certain precipitates is accelerated by the addition of V during aging. By contrast, excessive V decreases the strength and ductility simultaneously. This is due to the strong effect of ferrite formation compared to the beneficial effect of precipitation. The loss of ductility caused by adding higher amount of V is due to the formation of ferrite phases which in turn are suitable nucleation sites for crack propagation.     

精轧机导卫装置的改进设计与应用

由于导卫装置采用传统连接方式与轧机紧固一体,因传动链长、固定支点多,在生产中经常出现松动、卡死等现象,诱发轧制事故.为此,采用以进口导卫中线为基准、用孔型找正、实现轧制线统一的改进思路,设计了与轧机本体分离的固定导卫装置.应用表明,改进的导卫装置承受约180万次的冲击无变形,且调整灵活,换槽时间仅为3min.     

热轧带肋钢筋强度特性沿径向的分布

从钢筋的机械连接出发,研究了轧后弱冷和强冷钢筋强度性能沿径向的分布,发现剥肋后承载力的变化和力学性能沿径向的分布都与轧后冷却方式密切相关,强冷者显著降低而弱冷者基本不变。由此说明,强冷和弱冷钢筋分别适用于不剥肋和剥肋的滚轧直螺纹连接技术。从冷却方式、组织分布特征上对其现象做了解释。     

热轧带肋钢筋强度特性沿径向的分布

从钢筋的机械连接出发,研究了轧后弱冷和强冷钢筋强度性能沿径向的分布,发现剥肋后承载力的变化和力学性能沿径向的分布都与轧后冷却方式密切相关,强冷者显著降低而弱冷者基本不变。由此说明,强冷和弱冷钢筋分别适用于不剥肋和剥肋的滚轧直螺纹连接技术。从冷却方式、组织分布特征上对其现象做了解释。