加热温度对X70钢原始奥氏体晶粒尺寸的影响

对X70管线钢的原始奥氏体晶粒尺寸随加热温度的变化情况进行了研究,结果表明,随着加热温度的升高,原始奥氏体晶粒尺寸逐渐增大,并在1 200℃附近出现粗大晶粒,而钢中的铌在1 150℃左右已基本固溶,由此对此种管线钢在控轧控冷工艺中加热温度的选择进行了探讨。     

连铸坯热送热装生产工艺的实践

叙述了低合金高强度钢在中国钢铁工业继续发展中的作用，介绍了国外低合金高强度钢在产品、合金化和工艺设计方面的发展。     

管件用管性能优化与改进

分析宝钢管件用管的原有实物质量和国外同类钢管的性能,通过降低成分设计中碳含量和硅含量提高钢管的塑性和韧性,适当提高锰含量以确保强度,提升钢管机械性能对后续加工的适应性。同时,通过改进张力减径机导向管固定方式、张减孔型合理配置和输送装置跟踪修磨等合适的表面质量控制措施,避免钢管在轧制中产生辊印和外表擦伤。生产证明,材质和生产工艺的改进使管件用管的实物质量得到改善,满足用户要求。     

高氮钢的基础研究及应用进展

介绍了高氮钢结构特点的最新研究,高氮钢平衡相图的进展及其在高氮钢成分设计方面的应用;概括了氮在钢液中的溶解度公式和高氮钢熔炼过程中的关键问题;分析了氮在奥氏体钢、铁素体钢和双相不锈钢中的作用,即氮在不牺牲强度的同时不仅提高了钢的韧性,且改善了钢的抗腐蚀性能;并列举了一些典型的高氮钢的用途。     

石油钻杆精整线物流跟踪控制系统设计

宝钢石油钻杆生产线是国内唯一的一条具有高技术水平和钻杆精整生产线。由于整个加工过程分成工具公接头加工和工具母接头加工两次循环。第一次循环后管子要落地成捆,实施调头后再次上料,故采用这囊加工方式很难实现对每根钢管的质量数据跟踪;此外,原有的控制系统功能单一,数据通讯能力差,无法实时采集超声探伤、硬度检验等质量数据。针对以上问题,设计了条形码阅读和打印系统,并将钢管精整线控制系统的模式与钻杆线的特点有机地结合起来,采用三电一体化的方式设计了相应的控制系统和控制流程。     

管线钢的研发过程及方向

介绍了管线钢的发展过程及研究方向，论述了管线钢的冶炼、轧制技术及质量控制和性能控制要点，提出了开发管线钢应该注意解决的问题。     

包钢齿轮钢20CrMnTiH热轧圆钢试制

文章介绍了包钢齿轮钢20CrMnTiH热轧圆钢的试制工艺.结果表明,采用现有工艺装备,通过合理的工艺参数控制,包钢可以生产出合格的保淬透性齿轮钢20CrMnTiH热轧圆钢.     

X60钢级海底无缝管线管的研发

总结了X60钢级海底无缝管线管的研发工作,阐述了微合金化钢种的设计方法。归纳了生产控制过程中的难点,介绍了生产工艺流程和热处理工艺的制定,提出了进一步改进的观点。     

高强吹灰枪管材用30Cr1MoV钢的研制

高强吹灰枪管材用３０Ｃｒ１ＭｏＶ钢由鞍钢第三炼钢厂围炉冶炼，经圩初轧开，大型厂这坯，最后由无缝厂轧制成成品管。经试生产表明：鞍钢现有的生产工艺完全可以满足生产３０Ｃｒ１ＭｏＶ钢的工艺要求，试制钢的质量和性能均达到了技术要求。     

Microstructure and Tensile Properties in Dual Phase and Trip Steels

Advanced high‐strength steels, like dual phase and TRIP steels, have gained much interest for automotive application. The complex microstructures in dual phase steels, and even more critical, the metastable microstructure in TRIP steels, do not follow the well‐established traditional microstructure‐property relationships for deep drawing steels. The volume fraction of the different phases, the phase distribution, and the stability of metastable phases influence significantly the forming potential. This paper discusses the correlation between different microstructural features and the mechanical properties. The tensile test properties of dual phase steels are governed by the martensite volume fraction, the martensite hardness and to a much smaller extent the martensite island diameter. Both in dual phase and more pronounced in TRIP steels the retained austenite content plays a vital role in determining the formability. The stability of the retained austenite can be described by different methods, it needs to be adjusted according to the forming temperature and the type and amount of strain. In general, multiphase steels require a very strict microstructure control in order to develop predictable forming behaviour.     

微合金化在海底管线管生产中的应用

介绍了微合金化X56海底管线管的研制，结果表明产品满足API5L.Spee和DNV标准技术要求，产品具有稳定的机械性能和良好的焊接性能，其焊缝低温夏比冲击功高于39焦耳。     

锆处理低碳低合金高强度钢的杂质控制

针对传统工艺技术生产的高强度低合金钢(HSLA)中杂质较高、性能不稳定等缺陷,改进了冶炼及连铸过程中一些工艺,形成了一套自主操作技术.生产的锆处理HSLA钢杂质含量显著降低,加入合金元素锆经改进工艺生产的钢板中夹杂物的大小、形态及分布均得到了明显改善,形成颗粒细小、圆形或近圆形、呈弥散分布的夹杂物.经电子探针和能谱分析表明,夹杂物一般是由Ti2O3、Al2O3、ZrO2及MnS组成的复合夹杂物,Ti2O3、Al2O3、ZrO2位于复合夹杂物的中心部位,MnS位于外层.锆处理和新工艺联合应用有效地改善了钢中夹杂物的特性,生产的HSLA钢板质量大幅度提高,具有良好的力学性能.     

高韧性B级管线用钢的开发

针对国内外长输管线的发展需要,梅钢对高韧性管线用钢的成分及工艺进行了优化调整。结果表明：实物质量达到国际同类产品的一流水平,解决了高韧性B级管线用钢长期依赖进口的难题,实现了管线钢产品的更新换代,对推进国产化生产具有现实意义。     

PCS7在包钢轨梁厂大H型钢热轧线的应用

文章主要叙述了包钢轨梁厂大H型钢生产线一级自动化控制系统,全线采用西门子PCS7软件进行编程,结合西门子6ES7 416-3DP控制器,实现热轧区域自动化控制,同时实现Profibus网络和Ethernet网络之间的信号交换,以及在PCS7软件系统平台下通过HMI实现对整个生产线的监控、操作以及信息记录等功能。     

Analysis of Microstructure and Mechanical Properties of Different Hot Stamped B‐bearing Steels

Hot stamping is a technique to produce ultra high strength automobile components. The common material used in hot stamping process is coated and/or uncoated 22MnB5 boron alloyed steel. Ferritic‐pearlitic microstructure in as‐delivered sheets is transformed to fully lath martensitic after hot stamping. In the present research, hot stamping under water or nitrogen cooling media was investigated using different boron alloyed steel grades. Microstructural analyses, linear and surface hardness profiling as well as tensile tests of hot stamped samples were performed. Various microstructures of fully bainitic and/or fully martensitic were produced. The resulting microstructures provided yield strengths of 650–1370 MPa and tensile strengths of 850–2000 MPa. There is an optimum carbon equivalent content for which the highest formability index value, UTS × A₂₅, is achieved. Using a nitrogen cooled punch resulted in higher yield strength without significant changes in ultimate tensile strength. It is concluded that a wide range of B‐bearing steels having an extended carbon equivalent range with an acceptable formability index value can be used by increasing the cooling rate in the die assembly.     

Properties and Metallurgical Aspects of Heavy Wall Q&T Line Pipe Steels

The production of Q&T line pipe steels for heavy wall pipe requires several properties to be fully matched.Among them is the yield strength for strain based criteria pipelines for subsea application.Yield strength must match the required minimum under elevated temperature conditions [60 & 160 ℃] and at the same time do not exceed the surface hardness that will make the welding inadequate.Maximum of 220 vickers hardness has been set for some of the subsea projects.Production in a busy Q&T line requires simple tools to predict the time and temperatures to achieve the desired properties.The classical strength and logarithm of time,after Bhadeshia [1],has been used with excellent results in these line pipe steels of different wall thickness.     

单系统高炉煤气管网调控装置的应用和创新

阐述了迁钢公司一期工程高炉煤气管网调控装置的应用和创新情况,改造后不仅弥补了设计缺陷,消除了重大安全隐患,提供了可靠保障,而且取得了相当可观的经济效益。