中厚板角轧宽展技术的研发与应用

分析了宝钢湛江中厚板厂产品结构;为提高产能和宽展工艺的生产效率,针对小展宽比轧制,提出一种新型中厚板柔性宽展轧制工艺—角轧宽展工艺。开发了角轧宽展工艺的计算模型和自动控制系统;为了验证角轧工艺的可行性和理论模型的设定精度,在宝钢湛江4 300 mm中厚板厂开展了角轧工艺工业生产试验研究,并对试验钢板几何尺寸和设备力能参数进行了实测和分析。生产表明,角轧宽展工艺能够提高宽展轧制的生产效率、降低宽展轧制的轧制力和扭矩,有利于延长设备寿命;角轧宽展控制系统具有较高的控制精度,宽展能力满足中厚板小宽展比的生产需求。     

IMS多功能测厚仪高压控制发生器故障分析及改进措施

针对宝钢湛江钢铁热轧厂IMS多功能测厚仪高压控制发生器灯丝电流多次异常持续升高的故障情况,检测灯丝电流控制板及灯丝高压变压器部分,对高压控制发生器内部工作情况进行解体检查。得知灯丝高压变压器部分磁芯松动是引起高压控制发生器灯丝电流故障的根本原因,提出防止磁芯发生松动等对策措施,取得了良好的效果,对于同类测厚仪的问题处理及高压控制发生器的控制机理分析具有参考意义。     

GD-OES study on oxidation behavior of FeMnAlC TWIP steel sheets during heating

The oxidation behavior of Fe-16%Mn-1.5%Al-0.6%C-0.11%Cr TWIP steel sheet during heating process was studied by simulation experiments. The effects of heating temperature and O2 content in heating atmosphere on the depth distribution of surface elements were analyzed by GD-OES. When TWIP steel sheet is heated to 550-700℃ in the atmosphere of N2-0.05 vol%O2, an oxide layer composed of Fe, Mn and O covers the surface, a Mn depleted zone, a decarburized zone and an internal oxidation zone will be formed in the subsurface layer. The thicknesses of the oxide layer and the subsurface zones increase with heating temperature increasing. When being heated in an oxidizing atmosphere, Al preferentially forms internal oxidation in the subsurface layer, and a small amount of Cr forms external oxidation at the oxide layer/matrix interface. The surface oxide layer basically contains no Al and Cr. When the heating temperature is 650℃, the change of O2 volume fraction in the atmosphere between 0.025%-0.20% has little effect on the thickness of the oxide layer, and the oxide layer with a thickness of 400-500nm can be obtained. In order to obtain the appropriate thickness of the pre oxide layer of TWIP steel and reduce the oxide at the interface between the pre oxide layer and matrix interface, the temperature control of the direct fire heating outlet is more important than the air-fuel ratio control.     

湛江钢铁项目建设及高炉关键装备技术开发应用

针对宝钢为什么要建设湛江钢铁项目、湛江钢铁基地怎么建，介绍了湛江钢铁建设的背景及前期策划工作。湛江钢铁以“建成现代化、生态化、高效益，体现循环经济和节约型社会理念，简单、高效、低成本，具有国际竞争力的绿色碳钢板材精品基地”为目标，致力于炼铁装备技术创新方面的探索和实践，对特大型高炉无料钟炉顶、TRT和鼓风机等关键设备开展国产化攻关和技术开发，取得了重大技术突破，实现了中国炼铁工业在关键装备和技术领域的新跨越。     

高等级海上风力发电机用钢的研发及力学性能

基于超快冷热机械控制工艺(TMCP),成分设计上遵循低碳含量、低碳当量、微合金化,焊接时采用大热输入的原则,成功研发出了屈服强度为460 MPa的高等级海上风力发电机用钢。阐述了开发的两种钢的化学成分设计及试制工艺流程,并对其综合力学性能进行分析。结果表明:开发的两种钢具有生产周期短、强度高、韧性好、抗层状撕裂性能好、耐疲劳性能好、止裂性能优异及可采用大热输入焊接等特点,符合海上风力发电机用钢的发展方向。     

长流程钢铁企业检化验设施的现代化设计

检化验系统对钢铁企业的进厂原料检验、中间产品检测、出厂产品质量判定等有着重要意义。对钢铁企业检化验系统的设置原则、组成和发展趋势进行了介绍,集中化、智能化和信息化是现代化钢铁企业检化验系统的特点。重点论述了原料取制样系统、原料分析中心、冶炼分析中心和轧钢检测中心的建设设计理念。随着中国智能制造发展,全自动智能检测系统、信息流过程自动化及实验室管理自动化已成为当今钢铁企业检化验系统设计不可避免的趋势。     

15CrMoR钢的显微组织与时效冲击性能

 为探索原始组织形态对15CrMoR钢时效过程低温冲击性能的影响,明确15CrMoR钢具有高时效冲击性能稳定性的原始组织形态,通过控制奥氏体化后的冷却方式获得了15CrMoR钢的3种原始组织,使用OM、SEM、EPMA和EBSD等材料结构表征方法和低温冲击测试研究了15CrMoR钢的显微组织和时效态低温冲击性能。结果表明,15CrMoR钢奥氏体化后分别以炉冷、空冷和风冷的方式冷却至室温,分别获得了粗大铁素体+片状珠光体组织、铁素体+退化珠光体组织和粒状贝氏体组织。片状珠光体组织中碳化物主要呈层片状,退化珠光体中的碳化物主要呈断续短杆状和颗粒状,粒状贝氏体中的富碳M-A岛主要沿晶界分布。3种原始组织形态的15CrMoR钢在循环时效过程中均发生了晶界碳化物析出和长大,导致低温冲击性能不断恶化。当晶界碳化物呈链状分布时,15CrMoR钢的低温冲击性能较差。粗大的铁素体+片状珠光体组织晶界面积较少,导致晶界碳化物容易呈链状分布;粒状贝氏体中主要沿晶界分布的富碳M-A岛也容易导致晶界碳化物呈链状分布。因此,原始组织为铁素体+退化珠光体的15CrMoR钢在循环时效过程中具有较好的冲击性能稳定性,经历6次循环时效后,-10 ℃平均冲击吸收功仍高达196 J;而原始组织为铁素体+片状珠光体和原始组织为粒状珠光体的15CrMoR钢,经历4次循环时效后,晶界处已形成呈链状分布的碳化物,-10 ℃平均冲击吸收功均仅为18 J。     

关于直接还原铁工艺及还原气制备的若干思考

优化改良氢基直接还原铁制备工艺是中国发展实施碳减排的有效途径之一,随着碳减排和碳中和的积极推进,氢基直接还原铁工艺必将有较大的发展.从含铁原料、还原气制备参数选择和能源保障等三方面讨论分析了有关氢基气体直接还原铁工艺中存在的难点问题,尤其针对还原气制备参数的选择问题,创新性地提出了确定制备氢基还原气体工艺参数的图解法....     

Improvement of sintering performance of sinter mixtures containing high ratio of specularite fines

Although specularite fines possess high iron grade and low impurities, their granulation performance was poor so that the ratio of specularite fines is kept below 20% in sinter ore blends because of low permeability and productivity and weak strength. In order to increase its ratio in sintering, binders were used to improve the granulation performance of sinter blends containing high ratio of specularite fines in sintering pot test. Results show that cold permeability of the sintering bed increases by 19. 05% by adding 0. 65mass% bentonite or by 27. 98% by 0. 55mass% BF composite binder respectively when 36 mass% specularite fines are proportioned in sinter blends. In addition, the hot permeability is also improved by adding bentonite or BF composite binder, respectively, resulting in an increase in the productivity of 11. 67% and 7. 50% as well as an decrease in solid fuel consumption of 2. 82kg/t and 4. 01kg/t, respectively, while the tumble index, chemical composition and metallurgical performance meet the requirement of blast furnace. So using suitable binders is one of effective ways to improve the granulation and sintering performance of sinter ore blends comprising high ratio of specularite fines.