高线工艺优化提高硬线盘条质量

针对首钢水钢二轧钢车间高线在巾6．5mm70#硬线系列盘条生产过程中存在的质量问题,采取多项有效的技术改进措施,全面提高硬线钢盘条的综合质量,提高产品市场竞争力。     

Structure formation in wire

The microstructure formed in the surface layer of industrially produced steel 70 wire rod (diameter 5.5 mm), wire (diameter 4.2 mm), and thin brass-plated steel 70 wire (diameter 0.933–1.75 mm) is studied. Local surface sections with turbulent structure are identified by means of transmission and scanning electron microscopy and microhardness measurements. Those sections are associated with shear stress forming additional rotary deformation modes. With increase in the deformation, a gradient in the microhardness appears. The hardness is greatest at the surface in sections with anomalous structure. The dynamics of dislocational structure in metal with deformation is investigated. The formation of pearlite colonies in high-carbon steel is studied. The results may be used in determining the limiting deformability of wire rod and wire on drawing.     

线材减定径关键工艺装备技术的研究与开发

分析了高速线材及减定径技术现状,对减定径工艺装备相关的孔型设计、微张力控制、控制冷却模型、速比配置及换挡技术、模态分析等重要问题进行了研究。开发了先进的SRSCD线材减定径机组及水冷控温模型系统,可实现750 ℃低温轧制和40%～45%大压下,产品精度达到±0.1 mm,并在某不锈钢线材生产线上进行了定径机的高精度轧制验证,其产品精度达到研发目标,开发的SRSCD机组为线材生产技术升级提供了良好的手段。     

Ensuring high quality indices for the wire rod used to make metal cord

Mastering the production of high-carbon wire rod — especially cord-grade wire rod — on a mini-complex originally built at the Moldavian Metallurgical Plant to make ordinary wire rod was a daunting problem that has been solved by a collaboration with the Ukrainian Academy of Science’s Institute of Metallurgy. Researchers developed an integrated technology for making the steel, continuous-cast semifinished products, and wire rod needed to make metal cord of ordinary, high, and ultrahigh strength. The wire rod is characterized by a good-quality surface (defect depth no greater than 0.15 mm, with 95% being no deeper than 0.10 mm), good deformability, and the ease with which it can be converted into wire, strands, and cord structures.     

几种棒线材生产的新工艺

棒线材生产新工艺和新技术主要分两类：一是通过微合金化强化或工艺强化机理,提高棒线材强度或塑性,如碳纳米管技术、超细晶钢生产技术、超快冷工艺、线材在线盐浴处理工艺等;二是通过流程简化和局部工艺优化,提高生产节奏,降低生产成本,如连铸连轧工艺、热装热送工艺、无头轧制技术和超短流程工艺等。介绍了近几年来国内外棒线材生产最新的一些工艺及技术,包括纳米材料技术、超细晶钢生产技术、超快冷工艺和短流程生产工艺等。     

High-carbon wire rod made of steel microalloyed with vanadium

The Moldavian Metallurgical Combine has mastered the production of quality vanadium-bearing high-carbon wire rod 5.5–12.0 mm in diameter. Strengthening of the grain boundaries of the steel and its dispersion-hardening significantly increase the strength properties of wire rod made of steel that has been microalloyed with vanadium, while the ductility of the product also remains high. Tests in which vanadium-bearing high-carbon wire rod 5.5–12.0 mm in diameter was drawn into 3–7-mm-diam. wire were conducted at hardware plants and showed that the wire rod is well-suited for the production of wire used in the reinforcement of prestressed concrete structures.     

气保焊接用钢WER80S—G盘条的研制

采用先进的延迟冷却工艺在高速线材生产线上开发出550MPa级低硫、高韧性气保焊接用WER80S-G盘条,盘条ω（S）不高于0．005％。焊丝富Ar熔敷金属冲击功-30℃KV2平均达到170J以上,远高于设计要求。对比分析2种不同微量元素总量的盘条（焊丝）熔敷金属韧性以及2种不同保温罩状态设置轧制工艺时盘条金相组织的差异,据此优化WER80S-G盘条（焊丝）化学成分及轧制工艺条件,盘条具有F＋B组织,避免了淬硬组织,拉拔性能优良。     

汽车用弹簧钢线材夹杂物的控制

汽车轻量化发展伴随着汽车弹簧使用强度的提高,从而对钢中夹杂物的要求也越高。通过分析典型的汽车弹簧对线材中夹杂物的要求,介绍了国外弹簧钢线材先进生产企业的冶炼工艺,综述了目前国内外关于弹簧钢中夹杂物的研究报道,可为国内弹簧钢线材生产企业开发或改进汽车用弹簧钢线材提供参考。     

Thermomechanically treated high-carbon wire rod for high-tension wire

In twist tests of high-tension bronzed wire (diameter 1.55–1.83 mm) produced by direct drawing from thermomechanically treated wire rod (diameter 5.5 mm), lamination of the metal may be completely eliminated if the carbon and manganese content is reduced and chromium is added.     

High-carbon wire rod made of high-chromium steel

A comprehensive study of the quality of experimental wire rod made of steel C82D2 with 0.30% chromium has shown that this material can be used as a replacement for vanadium-bearing wire rod. In this case, it is necessary to subject the rod to two-stage cooling on a Stelmor line in a process that includes the following: • coil formation at t_co = 940–970°C; for 12.0-mm-diam. wire rod, t_co = 960–1000°C; • the operation of six jet-cooling blocks operating with a motor speed of 1480 min₋₁; • transport of the metal on a roller converyor moving at a speed of 0.5 m/sec. The presence of martensitic sections and a cementite (carbide) network in the structure of the metal is not grounds for rejection of the product. __________ Translated from Metallurg, No. 4, pp. 59–62, April, 2006.     

高强度大桥缆索用盘条生产现状分析

最近5年,大桥缆索用镀锌钢丝抗拉强度有了大幅提高,从1 770 MPa级、1 860 MPa级、1 960 MPa级到目前的2 000 MPa及以上级别,扭转指标有了颠覆性的改变,从之前的几转到目前的十几转、二十几转。论述了国内外钢铁企业生产大桥缆索镀锌钢丝用盘条的不同现状。从成分设计、生产工艺流程、盘条韧化处理方式和组织特点等方面进行阐述,讨论了国内外不同生产工艺特点及发展趋势,为中国大桥缆索镀锌钢丝用盘条的生产提供理论支持。     

82B盘条质量分析与讨论

通过对82B盘条质量的分析与讨论,弄清了钢丝及钢绞线生产企业对盘条质量的要求,知晓了国内盘条存在的主要质量问题。为了满足用户使用要求,水钢研究开发了成分合理、钢质洁净、性能稳定的82B盘条。     

SWRH72A盘条拉拔断裂分析

用光学金相显微镜和扫描电子显微镜对SWRH72A盘条拉拔断裂试样进行一系列检验分析。结果表明:SWRH72A盘条组织中出现大量粗片状的珠光体是导致盘条拉拔断裂的直接原因。大量粗片状珠光体的形成与吐丝前后的冷却速度过慢等因素有关。严格控制吐丝前后的冷却速度,防止盘条堆积过密,可获得拉拔性能优越的索氏体组织。     

螺纹钢盘条负偏差轧制与组织性能研究

对螺纹钢盘条负偏差轧制技术及控轧控冷对组织性能的影响进行了研究。结果表明：生产的螺纹钢盘条屈服强度平均值为498 MPa,抗拉强度平均值为615 MPa,伸长率平均值为24.11%,轧后螺纹钢盘条边部组织为回火索氏体,晶粒度为13.5级,心部组织为铁素体加珠光体,晶粒度为12.0级,淬透层深度为0.50 mm,该产品的...     

低氧铜杆线铜粉剥离原因分析及其对策措施

表面铜粉剥离,导致铜杆线表面损伤,其对铜杆线拉伸过程具有较大影响。通过扫描电镜分析,剥离铜粉厚度可达25μm,经物相分析确定其主要成分为铜及铜的氧化物。通过对剥离物和杆线表面缺陷进行形貌分析,以铜杆线的生产、加工各环节作为研究对象,并确认了铜杆轧制工艺、无酸清洗工艺、线表擦伤、拉伸角度及拉丝模具等5方面影响因素,制定了相应的对策措施。研究表明,铜杆氧化物剥落和机械损伤是铜粉剥离的主要原因,在铜杆线生产、加工环节,防止氧化物带入铜基体和避免铜线表面损伤能有效减少铜杆线铜粉剥离。     

制定我国优势技术国际标准促进我国线材制品工业的发展盘条尺寸偏差与胎圈钢丝国际标准的制定

综述了ISO/TC17/SC17秘书处制定的我国优势技术国际标准的内容和特点,提出以我国优势技术国际标准促进我国线材制品工业的发展的思路。     

高碳钢盘条SWRH82BCr试制

为了满足出口用户的要求,进行了高碳钢盘条SWRH82BCr的生产试制。介绍了该盘条的试制过程,对采用200mm×200mm连铸坯直接轧制的盘条实物质量进行了检验,给出了试制结果。针对首次试制的盘条中心网状碳化物级别、中心马氏体级别偏高的问题,进行了斯太尔摩风机风量的调整,稳定了盘条的出厂性能。试制结果表明:该钢种试制工艺路线合理,优化后的高线斯太尔摩控冷工艺得到固化,盘条的中心网状碳化物、中心马氏体级别均不大于0.77级,索氏体体积分数不小于90%,断面收缩率不小于42.5%。     

High-deformability wire rod made of steel Sv-08G2S

Welding wire is made with the use of wire rod composed of steels Sv-08G2S, Sv-08G1S, and SG-1, 2, 3. A new technology that has been developed to obtain this product provides for mechanical scale removal, dry drawing of the wire rod to an intermediate diameter of 1.7–2.2 mm, then — without an intermediate heat treatment — wet drying combined with electrochemical copper-plating of the wire surface. The diameter of the wire is 1.6—0.8 (0.6) mm. The advantages of the new technology for making welding wire are obvious: a reduction in production cost due to the elimination of pickling and heat treatment for the rod; an improvement in the environmental situation at the manufacturing plant. __________ Translated from Metallurg, No. 2, pp. 64–70, February, 2007.     

预应力混凝土钢丝张拉断裂分析

针对高碳钢盘条加工的预应力混凝土钢丝在轨枕模型中张拉断裂问题,对张拉断裂、拉拔断裂及盘条试样进行检验分析,并结合工艺参数控制情况,分析断裂产生的原因,提出改进的措施。经生产应用,后续生产盘条加工的钢丝未出现张拉断裂现象。     

Structure and properties of nickel-molybdenum steel wire rod after thermomechanical treatment

The mechanical properties and structure of low-carbon nickel-molybdenum steel wire rod after softening thermomechanical treatment in a high-speed wire mill are studied. Dislocations may move through insular martensite and bainite sections of the structure under the action of deformation. Good plasticity of wire rod in deformational shaping may be ensured by the presence of a small proportion (up to 10%) of sections with bainite-martensite structure and the motion of dislocations through those sections.