微合金非调质压力容器钢的研究进展

通过对国外压力容器用钢牌号及相关标准研究情况的分析,结合国内压力容器钢的研究、生产现状提出在节约能源和降低消耗基础上研制生产高强度级别压力容器钢的思路,充分发挥微合金化(Micro alloying)成分设计和利用热机械控制轧制(Thermo Mechanical Control Process简称TMCP)优势可生产出高强度压力容器用钢,实现降低能源消耗、减少污染和节约成本获得等同或高于调质处理的优质性能的钢材.     

宝钢开发微合金化非调质塑料模具钢的前景及设想

概述了国内主要家电制造厂的塑料模具用钢的情况，目前国内常用塑料模具钢一般分两类。一类为中碳钢，主要用于模架及对技术性能要求不高的型腔模具；另一类为国内信制Ｐ２０和德国，瑞典等产Ｐ２０和７１８等，应用于生产高表面光洁度塑料制品的型腔模具。中碳钢产品在正火态使用，其硬度在ＨＢ１８０－２２０，Ｐ２０产品以预硬态（空冷＋回火）供货，厂家将其调质到硬度ＨＢ２８０－３３０。还分析了国内外不同厂家生产的塑料模具     

日本住友金属小仓厂开发非调质软氮化曲轴用钢

近年来,由于地球环境保护的需要,不仅要求发动机主要部件曲轴进一步轻量化、高强度化以实现运转中CO2的减排,而且还要求简化曲轴制造工艺以实现制造过程中CO2的减排。为此,日本住友金属小仓厂开发了高疲劳强度、矫正加工性良好的非调质软氮化曲轴用钢。     

低成本高档非调质曲轴钢的生产实践

抚顺特殊钢股份有限公司采用EAF—LF—VD—CC—CR短流程工艺生产以S45CVS为代表的高档非调质曲轴用钢。通过控制电炉出钢氧含量、优化预脱氧工艺、改进调硫方法、控制终点铝含量、合理选择连铸参数、控温控轧等措施,稳定地控制钢液可浇性、连铸坯质量、钢材夹杂物级别、钢材表面质量、钢材氧含量及钢材晶粒度,实现了低成本生产高档非调质曲轴用钢。     

大规格连铸非调质曲轴用钢的开发和生产

随着人们对能源与环保问题的日益关注,发展节能、环保、低成本的非调质钢,替代能耗高、周期长的调质钢汽车零件成为发展汽车用钢的必然趋势。在试验研究的基础上,开发了覆盖130mm～220mm的锰-硫、锰-钒和锰-钒-硫系大规格连铸非调质曲轴用钢,产品广泛应用于国内外知名品牌重型卡车。满足终端用户的使用要求并形成规模生产,产生了巨大的经济效益。     

转炉冶炼65钢生产实践

介绍了安钢100t转炉生产65钢的工艺技术及冶炼效果,分析了转炉生产中、高碳钢的技术要点及影响因素。通过采取相应的技术措施确保了产品质量。     

48MnV-C非调质曲轴钢增氮工艺研究

采用"转炉→RH+LF→矩形坯连铸"工艺流程生产48MnV-C非调质曲轴钢,在LF精炼时添加氮化锰进行钢水增氮操作,钢中氮质量分数可稳定控制在(108～134)×10-6,平均值为120×10-6,并可预防轧材的"白点"缺陷。     

LF炉品种钢工艺实践及精炼效果分析

介绍川威集团公司LF炉设备概况及冶金工艺流程,根据精炼过程脱硫反应热力学计算分析了脱硫效果.对低硫管线钢X52的冶炼造渣工艺和实际生产情况进行阐述,讨论了进一步开发利用LF炉冶金功能问题.     

PID控制在转炉生产过程中的应用

介绍PID控制系统的原理,STEP7编程软件的特点,WinCC操作员监控系统及SIMATIC的全集成自动化方案,并结合本厂转炉生产过程中的具体应用及其效果来说明转炉生产过程中的PID控制。     

Production of 48MnV-C non-heat treatment crankshaft steel by means of converter plus continuous casting and hot-rolling process

48MnV-C non-heat treatment crankshaft steel is specially used for making crankshafts of Cummings C engines.It mainly adopts the technology of V—N micro-alloying,at present,it has been successfully used in making crankshaft of heavy duty truck engines.BX STEEL made trial production by means of converter→secondary metallurgy(RH + LF)→rectangular slab caster→hot rolling process,and studied the T[O],T[N],[H]and non-metal inclusion in 48MnV - C steel under continuous casting process condition,the actual grain size and the slab quality.All the chemical compositions and test results met the needs of Cummings Crankshaft Steel Standard.In order to ensure the mechanical properties of the non-heat treatment steel,a certain amount of nitrogen is added to it,also a small amount of sulfur is added to improve the cutting property of the steel.This process route can make full use of the de-hydrogen function of RH,and during RH treatment,rough adjustment of alloy elements may be made while the adjustment of Nitride Manganese nitrogen pick up and adjusting Mn,as well as Ca treatment and S content adjustment may be done during LF treatment so as to ensure the requirement of high nitrogen,low hydrogen,low oxygen content in 48MnV-C steel.Magnetic marks are defects shown in magnetic powder testing after the steel was used to make finished crankshafts.The 48MnV - C non-heat treatment crankshaft steel produced by means of the above-mentioned process route has not only relatively high robust performance which meets the needs of truck crankshaft safety,but also high qualification rate and basically no magnetic marks are found after being made into finished crankshafts,which meets the crankshaft standard.Therefore,this steel has been widely used in domestic crankshaft industry.     

渣钢在转炉炼钢中的应用分析

渣钢是钢渣处理后的主要产品之一,过去由于研究不够尚未得到应用.济钢第二炼钢厂在转炉内直接加入渣钢代替废钢进行了生产性试验,分析了渣钢对转炉冶炼和经济效益的影响,对废物的再利用和发展循环经济能起到一定的积极作用.     

低碳低硅SPHC钢优化精炼工艺的生产实践

结合某钢厂低碳低硅SPHC钢种生产基本情况,分析了SPHC钢生产工艺流程的特点以及过程中存在的主要问题.通过对其现有生产工艺的优化,脱硫率从35.7％提高到45.5％,且铸坯中夹杂物小于1.0级的比例达80％,在保证转炉冶炼SPHC钢质量的同时,冶炼成本可降低约3.14元/t.     

不锈钢除尘灰的再利用研究与实践

为回收利用不锈钢除尘灰中的铬、镍、铁氧化物,山西太钢不锈钢股份有限公司自主开发了一种不锈钢除尘灰的处理应用技术,在除尘灰中配加还原剂和结合剂压制成球,压球在回转窑中经高温烧结,可方便地作为电炉原料使用;除尘灰压球在电炉冶炼不锈钢中使用,配合炉门氧枪吹氧操作,可形成稳定的泡沫渣,炉壁挂渣良好,对电炉炉龄提高有明显效果。     

Study of refining performance in BOS converter

Abstract

A unique in blow sampling system has been applied to a blowing converter to retrieve simultaneously representative bulk metal bath and slag/metal emulsion samples from seven specified positions and every 2 min from start of blow. Full sample datasets from 20 heats have been grouped according to differences in the bulk bath phosphorus removal profiles and analysed with respect to relative refining ability of the slag/metal emulsion and the bulk metal bath. The complexity of the thermokinetic relationships behind the removal of carbon and the transfer of silicon, phosphorus, manganese and sulphur between the metal and slag is highlighted and the metal circulation rate in the emulsion is derived.     

萃取法精炼黄金的研究和工业实践

主要研究了用萃取法进行矿产金的精炼。用某溶剂作为金萃取剂,用某复合反萃还原剂在常温条件下进行一步还原;将箱式混合澄清槽经改进后作为萃取器。该工艺已成功用于工业化生产,年精炼能力30t以上,并可实现工艺流程的自动化控制。经专家鉴定,该项萃取精炼技术已达到国际先进水平。