宝钢高速线材轧制节奏控制模型研究

介绍了高速线材的轧制节奏控制工艺,分析了高速线材现有轧制节奏控制方法以及存在的问题;在此基础上提出了轧制控制模型的改进方法;详细介绍了轧制速度计算模型的设计方法,并建立保温辊道闭环控制模型;对保温辊道减速控制过程进行了仿真分析,设计了速度与时间计算公式,修正了减速控制模型.新的控制模型在现场投入应用后,效果良好,提高了控制精度,减少了线材的出钢时间.     

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。     

高速线材力能参数预报系统开发

在深入研究各种数学模型的基础上,建立了适合线材轧制的模型,利用VC++和VB联合开发了高速线材力能预报系统。为了提高软件的预报精度,建立了适合高速线材轧制的短时和长时自适应优化模型。在孔型设计时,利用该软件可以提高各机架轧制力、轧制力矩以及轧制功率的预报精度,为校核孔型设计和选择电机提供了指导和参考。通过仿真和软件在现场试用表明,优化后的模型比原模型具有更高的精度,并且在变钢种变规格轧制时误差波动较小。     

棒线材节能减排低成本轧制技术的发展

在市场需求的强力拉动、棒线材研究成果的科技引领、产能过剩导致激烈竞争的形势下,中国棒材的生产技术向着节能减排、降低成本的方向快速发展,取得了显著的进步。典型的棒线材节能减排低成本轧制技术包括低成本高性能产品开发技术、免加热直接轧制技术、多线切分轧制技术、低温轧制技术、无孔型轧制技术、无头轧制技术等。对中国棒线材节能减排轧制技术今后发展提出了建议。     

Finite Element Modelling and Laboratory Simulation of High Speed Wire Rod Rolling in 3‐Roll Stands

Modern wire rod rolling is characterized by high finish rolling speed and requirements on close tolerances and well defined mechanical properties of the rolled product. In some senses the technological development has run in advance of the scientific knowledge of the phenomena involved in the process. Thus at present no laboratory mill is in operation for rolling speeds above 40 m/s. The modern technologies on thermomechanical rolling and sizing give certain phenomena difficult to handle for the mills, and especially finish rolling at low reductions and temperatures performed in three‐roll units sometimes give surprises on grain size distribution and allied properties of the wire rod. Traditional plastic analysis has proven not to be sufficient to analyse the processes involved in high speed rolling of close tolerance wire rod with well‐defined properties. Simulations by means of the Finite Element Method on the other hand have proven to be a powerful tool for this kind of analysis, even if the initial difficulties in creating a suitable model require certain care. Also the calculation capacity must be sufficient for making relevant three‐dimensional thermomechanically coupled studies. The high speed rolling of wire rod can be simulated under full‐scale conditions, and with correct boundary condition in the high‐speed laboratory wire rod mill at Örebro University. By utilizing both conventional two‐high stands and three‐roll units it has been possible to design a laboratory rolling mill for any rolling condition that can occur in wire rod mills. Rolling speeds up to 80 m/s can be combined with thermomechanical rolling in any interesting temperature range, and with total flexibility of reductions. Further, fundamental studies of high‐speed deformations can be performed in full‐scale and with correct frictional conditions and geometries. Thanks to the flexibility in layout and combinations with other equipment in the laboratory also other processes can be simulated.     

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...     

低温轧制技术在棒线材生产中的应用

介绍了棒线材低温轧制的发展情况。叙述了低温轧制的节能效果、低温轧制对成品质量的影响、低温轧制对轧机负荷的影响及低温轧制在生产中应注意的问题。为国内在棒线材生产中进一步应用低温轧制工艺提供了有益参考。     

天钢生产TS06拉丝专用钢盘条的实践

介绍了天钢利用顶底复吹转炉、LF精炼炉、方坯连铸、高速线材轧机工艺生产TS06拉丝专用钢盘条的实践。通过对转炉终点控制、LF钢包精炼工艺及控冷控轧工艺等方面的探索，顺利生产出了TS06低碳拉丝专用钢盘条，完全能够满足镀锌钢丝生产的需求。     

国产化设备在三钢集团公司高线生产线的使用

介绍了国产化设备线生产线的使用情况,此生产线由国内设计、制造和安装,设计年产量20万t,1998年高试,当年投产,6个月达主,投产少,见效快,现已达到年产40万t的生产能力,是国产化设备在高线生产线使用较成功的生产线之一。     

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。     

棒线材低温轧制技术发展

介绍了国内外棒线材低温轧制技术的发展情况.叙述了低温轧制的节能效果、低温轧制过程的温度控制、低温轧制对成品质量及轧机负荷的影响.为国内在棒线材生产中进一步应用低温轧制工艺提供了有益的参考.     

高锰高氮不锈钢10Cr21Mn16NiN线材开发

介绍了 10Cr21Mn16NiN钢线材成分设计、增氮原理、冶炼工艺、轧制和固溶工艺、Cr2N相析出的生产工艺.采用30 tAOD精炼,吹氮气增氮,精炼后期加氮化锰.轧制时采用1240℃加热、控轧控冷,保证了盘条表面质量,避免了中心缩孔等问题;固溶温度应控制在1 100℃左右,且保温30 min后快冷,可防止Cr2N相...     

Behaviour of Surface Defects in Wire Rod Rolling

Defects are often present in rolled products, such as wire rod. The market demand for wire rod without any defects has increased. In the final wire rod products, defects originating from steel making, casting, pre‐rolling of billets and during wire rod rolling can appear. In this work, artificial V‐shaped longitudinal surface cracks have been analysed experimentally and by means of FEM. The results indicate that the experiments and FEM calculations show the same tendency except in two cases, where instability due to fairly “round” false round bars disturbed the experiment. FE studies in combination with practical experiments are necessary in order to understand the behaviour of the material flows in the groove and to explain whether the crack will open up as a V‐shape or if it will be closed as an I‐shape.     

碳含量和控冷工艺对盘条ER70S-6性能及组织的影响

对3炉不同碳含量的焊接用钢盘条ER70S-6控冷工艺进行了研究，发现提高吐丝温度虽可以降低盘条的强度，但盘条中易出现混晶组织，碳含量小于0.08%可以使盘条的强度控制在较低水平。盘条拉拨试验结果表明，马氏体组织是引起脆断的重要原因，对盘条化学成分和冷却速度的控制是生产具有优良加工性能焊接用钢盘条的必要措施。     

EH14焊接用盘条的研制

青钢应用“转炉-小方坯连铸机-高速线材轧机”工艺流程试制EH14焊接用钢盘条。冶炼过程采用拉碳法吹炼、脱氧合金化、钢包底吹氩、全过程保护浇铸等工艺;轧制工艺制订了合理的轧制温度．生产出各项技术指标均符合标准要求的EH14焊接用钢盘条。     

马氏体钢40Crl0Si2Mo线材表面裂纹原因分析和工艺改进

40Cr10Si2Mo钢Φ6.5mm线材产品经过调质处理和矫直研磨后,发现磨光棒表面存在表面裂纹。通过进行40Cr10Si2Mo钢淬火回火模拟试验,得出造成40Cr10Si2Mo钢线材表面出现裂纹的原因为线材热轧后冷却时间短,冷却速度快,热轧线材表面存在较大的残余应力,从而形成表面裂纹。通过对40Cr10Si2Mo钢的生产工艺进行了优化改进,包括延长斯太尔摩辊道缓冷时间,终轧温度和吐丝温度由原来的900～950℃和850～900℃均调整为800～850℃,线材轧制后24 h内退火,从而避免了40Cr10Si2Mo钢线材表面裂纹的产生。     

30MnSi的控温轧制和控制冷却

通过对改造前后的30MnSi热轧盘条的控温轧制和控制冷却工艺进行分析.改造后高线30MnSi生产达到了控制轧制和控制冷却的目的.     

国内镍合金线棒材轧制技术发展及工艺特点

本文主要介绍镍合金线棒材轧制技术的发展,对几种轧制技术特点进行了分析,重点介绍了横列式和半连续式两种实际采用的镍合金线棒材轧制典型生产线。     

Cracking Phenomenon Occurring in Bi-S–Based Free-Machining Steel Wire Rods During Hot Rolling

In this study, cracks or scabs formed during hot rolling of Bi-S–based free-machining steel wire rods were analyzed, and their formation mechanisms were clarified in relation with microstructure. Detailed microstructural analyses of large-diameter rods showed that the rod having low carbon content was cracked, whereas the rod having higher carbon content was not, because oxides formed during hot rolling were penetrated into the relatively soft surface, thereby leading to the surface cracking. While the crack-free, large-diameter rod containing high carbon content was subsequently rolled to make a small-diameter rod, a few scabs of 1 to 2 mm in size were formed on the surface as some protrusions were folded during hot rolling. Thus, in order to prevent the cracking or scab formation in wire rods, (1) the increase in hot-rolling temperature for homogeneous rolling of rods, (2) the minimization of temperature drop of rolled rods upon descaling treatment, and (3) the increase of rolling passes and the decrease of reduction ratio of each pass were suggested. Using these methods, crack- or scab-free wire rods could be successfully fabricated.     

65#优碳钢盘条的生产实践

介绍了65#优碳钢采用超高功率100t竖式电弧炉初炼和LF炉精炼、再用R8m连铸机生产150mm×150mm方坯、经高速线材轧机控轧控冷工艺生产Φ6.5mm盘条的生产过程.指出了冶炼、连铸、轧制生产工艺的特点及其对产品质量的影响.