Influence of roasted siderite concentrate in the sintering batch on blast-furnace performance at OAO MMK

The chemical composition of the sinter obtained without Bakal siderite concentrate in the batch is calculated. The influence of Bakal siderite in the batch on the sinter composition is assessed. The sinter content in the blast-furnace batch, the MgO content in the slag, the slag yield, and the slag basicity are plotted against the content of siderite concentrate in the sintering batch.     

65Mn热轧窄带钢脱碳分析及控制

针对唐山建龙实业有限公司开发的热轧窄带65Mn钢出现淬火淬不上、淬火后硬度不均匀、淬火后板型发生飘曲等问题,进行了化学成分、金相组织、力学性能分析.对影响65Mn钢淬火后出现硬度不足、板形不良的问题进行了研究.根据试验结果,优化了化学成分、连铸配水、加热炉温度、加热炉炉气气氛等参数,解决了65Mn热轧窄带钢的脱碳超标问题,实现了批量生产.     

安钢500MPa级制管用钢性能不合格原因分析与改进

针对安钢500 MPa级制管用钢力学性能出现批量不合格的问题,通过对比轧制工艺和化学成分,分析出性能不合原因,指出冶炼成分中有效Ti含量偏低是造成本次性能不合的直接原因,并提出改进技术措施,同时进行小批量试验,效果良好,性能合格率达到100%,屈服和抗拉强度较改进前平均提高了40 MPa。     

微氮合金化HRB335螺纹钢生产实践

介绍了宣钢采用微氮合金技术生产HRB335螺纹钢的生产工艺,从批量试生产产品中抽取100组试样进行了化学成分和力学性能检测,检测结果均达到宣钢的目标值要求,降低了生产成本。针对力学性能波动较大的问题,下一步将进行深入研究。     

Quality of thick steel sheet for spiral-seam electrowelded pipe of strength class K60 (X70)

The mechanical properties, microstructure, fractures, and texture of a trial industrial batch of 07Г2MФБ steel sheet (thickness 21.7 mm) for the manufacture of spiral-seam gas-line pipe (diameter 1420 mm) of strength class X70 at OAO Volzhskii Trubnyi Zavod (VTZ) are investigated. It is shown that the selected chemical composition of the steel and thermomechanical rolling technology yield mechanical properties of the sheet and the basic pipe metal complying with VTZ specifications.     

Development of a Commercial Technology for Plasma Arc Remelting of a Nitrogen-Bearing 05Kh21AG15N8MF Steel

Steel 05Kh21AG15N8MF forgings 250 mm in diameter with a nitrogen content higher than 0.60%, which is necessary for a high-strength austenitic structure, are fabricated by plasma arc remelting. An experimental batch and strips are made of this steel. The chemical composition, the macrostructure, the mechanical properties, the intergranular corrosion resistance, and the hardness of the forgings are studied.     

X65QO φ457 mm x 25.4 mm大口径深海海底无缝钢管的开发和应用

设计研制了生产深水油气田大口径海底管线用无缝钢管的成分要求和工艺路线。小批量试制X65QO海底管线管,试制结果表明,通过微合金成分优化(/% ：0.15Mo,0.04Nb,0.09V,0.06Ti),皮尔格周轧管工艺,配合930 ℃淬火+670 ℃回火调质工艺,X65QO钢级深海海底管线管屈服强度为~500 MPa,抗拉强度为~580 MPa, -30℃低温冲击功＞300J,裂纹尖端开口位移(CTOD)以及焊接性能和氢致裂纹(HIC)性能较好,完全符合用户的要求。     

Introduction of manganese in pellet batch as a means of increasing the efficiency of blast-furnace smelting

Laboratory tests are conducted to determine how manganese-bearing additives affect the metallurgical properties of pellet and sinter batch based on titanium-magnetite concentrates from Kachkanar enrichment facility. The results show that such additives are more effective in pellet batch than in sinter batch. Moreover, the introduction of magnesium in pellet batch permits the formation of a fluxed product, without impairment of the metallurgical properties. This increases blast-furnace productivity by 1.0–1.5%, with analogous decrease in coke consumption.     

汽车用冷轧超低碳烘烤硬化钢板的组织性能与析出

实验研究了汽车用冷轧超低碳烘烤硬化钢板的成分、热轧冷轧及退火工艺对钢组织性能的影响规律,并分析了冷轧后连续退火和罩式退火不同条件下钢中析出第2相粒子形态和钢板的织构变化。     

HRB500E高强抗震盘螺的开发

承钢利用钒资源优势,采用钒微合金化方式,成功开发了HRB500E高强抗震盘螺,产品的化学成分和力学性能均达到GB1499.2-2007标准规定的抗震要求.目前,承钢开发的HRB500E盘螺已经实现批量生产,取得了良好的经济效益和社会效益.     

Effects of adding low-alkali red mud to the sintering batch at OAO Ural’skaya Stal’

The influence of low-alkali red mud on the mineral composition and physicomechanical properties of the sinter produced from OAO Ural’skaya Stal’ iron-quartzite ore is established. At the granulation stage, adding finely disperse low-alkali red mud increases the proportion of large fractions in the batch. The replacement of silicate binder by ferrite binder increases the strength of the sinter and reduces its abrasion.     

按BS4449:1998生产460MPa级钢筋问题探讨

详细研究了按英标BS4449:1998组织生产460MPa级钢筋的化学成分、生产工艺及力学性能之间的关系,为生产厂按BS4449:1998生产460MPa级钢筋奠定了基础。     

C600BL汽车边梁用热轧卷板的开发

承钢公司在自身钒钛优势的基础上,采用以低成本的钛＋余钒强化为主的成分设计,通过制定合理的冶炼、连铸、轧制工艺参数,在1780生产线研制成功汽车边梁用C600BL钢.该产品的综合性能完全满足客户的使用要求,冷成型性能良好,目前已经实现了批量生产.     

Laboratory Investigations on Copper‐alloyed Interstitial Free Steel – Part I: Effect of Annealing

Effect of 1.18 wt.% copper on the annealing behaviour and the resulting mechanical properties in conventional mild interstitial free steel has been investigated. It is revealed that copper forms complex precipitates during batch annealing and modifies the batch annealing characteristics as compared with the base steel. Accordingly, strength‐formability parameters are influenced as well. In case of continuous annealing, solute copper controls the mechanical properties.     

Chloridization beneficiation of ilmenite

Chloridization is a potential method of beneficiating ilmenite. Studies on beneficiation of ilmenite were carried out by using titanium chloride as the chloridizing agent in a laboratory scale fluidized bed reactor. Experiments were conducted on 1, 10, and 36 grams per batch scale, and the effect of the various rate determining steps on conversion was studied. Treated particles of ilmenite were examined for chemical composition, surface properties, and structural changes. The paper presents the experimental results on the chloridization treatment of natural and oxidized ilmenite.     

Optimizing the composition of coking batch

The optimization of coking batch at OAO Nizhnetagil’skii Metallurgicheskii Kombinat (NTMK) is considered theoretically and on the basis of practical experience. An integral characteristic of the batch is proposed: the optimality coefficient K _opt. On that basis, the optimal batch composition may be assessed and the mechanical strength of the coke may be predicted.     

Reducing the environmental impact of blast furnaces by means of red mud from alumina production

A serious environmental impact of Russian blast furnaces is the generation of copious dust on account of the low strength of the sinter and pellets employed. Their strength may be increased if red mud from alumina production is introduced in the initial batch. A problem here is that the red mud lowers the iron content in the blast-furnace batch. However, this effect may be compensated by reducing the content of fines in the batch, according to research on the chemical composition of Russian blast-furnace batch. The minimum iron content in the red mud at which such compensation is feasible is established.     

CSP 冷轧DQ级钢工艺优化

 通过炼钢 CSP 冷轧DQ级钢小批量的工业试验,研究了各工序工艺参数对DQ级钢力学性能的影响。研究结果表明,CSP 冷轧DQ级钢生产可采用与常规热轧相似的化学成分;CSP采用“二高一低”工艺能有效减少氮化铝的析出;增加冷轧压下率、降低退火加热速度、减少平整伸长率,DQ级钢力学性能显著提高。研究成果运用于实际生产中,涟钢DQ级产品广泛进入了车辆冲压板市场。     

建筑装饰用铸轧3004H24铝合金带材工艺研究

试验采用铸轧3004坯料生产建筑装饰用铝带材。通过对材料化学成分、组织、性能等试验指标分析,确定成品退火制度,实现批量工业化生产,并生产出表面质量好、性能稳定的建筑装饰用铸轧3004H24铝合金带材,满足了用户的使用要求。     

本钢X70管线钢的组织与性能

介绍了本钢开发研制的X70管线钢化学成分和生产工艺特点,并对其组织性能进行了分析.结果表明,本钢X70管线钢具有高强度、高抗动态撕裂能力、高低温冲击韧性以及低韧脆转变温度.其优良的性能得益于内部具有与细小析出相交互作用的高密度位错的超低碳针状铁素体组织.目前已形成批量生产能力.