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连铸小方坯生产高质量特殊钢线材 总被引:5,自引:0,他引:5
综合论述了国际上用连铸小方坯生产高碳钢(包括轮胎钢)、弹簧钢、冷镦钢等特殊钢线材的工艺路线,比较了大、小方坯连铸的区别及用小方坯连铸生产这些钢种所采取的质量和工艺措施。 相似文献
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简要介绍了国际上用连铸小方坯生产高碳钢(包括轮胎钢)、弹簧钢、冷镦钢等情况,比较了大、小方坯连铸的区别用小方坯连铸生产这些钢种采取的质量措施。 相似文献
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介绍了宣钢二钢轧厂小方坯连铸机振动装置的设备组成、性能以及存在的问题。分析了振幅、振动频率、负滑脱时间等振动参数对铸坯表面质量的影响。结合宣钢小方坯生产实践,从振幅选择、振频与拉速匹配关系方面,优化了小方坯的振动工艺参数设置,对同行业小方坯振动优化具有借鉴意义。同时指出,机械振动已经不能满足钢种多样化的需求,新的振动技术必将得到更快速的发展。 相似文献
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汽车用合金冷镦钢在初轧从钢锭到小方坯的开坯后,高温的小方坯经过U-V齿型的冷床进行冷却.在实际生产过程中,无论是冬季还是夏季,以Cr-Mo系列合金冷镦钢为主的钢种在生产过程中经常发生"镰刀弯"的情况.从金相组织机理研究着手,发现钢坯弯曲主要是不同的金相组织的线性膨胀系数存在差异所造成的.通过采取控制冷却速度和最终金相组织的方法控制了钢坯的弯曲. 相似文献
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介绍了用顶底复吹转炉-LF精炼-8机8流连铸小方坯生产20Cr Mn Ti钢种过程钛控制的冶炼工艺。通过控制转炉物料加入顺序、加入量和过程铝含量,确保了钢中钛的稳定性。 相似文献
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低碳低硅钢(EGSI)小方坯连铸的生产实践 总被引:2,自引:0,他引:2
总结了鄂钢二炼钢低碳低硅钢小方坯连铸的生产情况,并就其连铸生产难点进行了研究分析,初步认为钢中含氧量是造成小方坯产生皮下气泡的主要原因,在实际生产过程中,通过采用合适的脱氧制度及严格控制转炉终点成份和出钢温度等措施,可防止该钢种连铸坯所产生的皮下气泡。 相似文献
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ANS—OB100t钢水精炼设备配小方坯连铸的冶金效果 总被引:1,自引:0,他引:1
鞍钢第二炼钢厂采用ANS-OB铝热升温的钢水,供小方坯连铸定径水口敝流浇注,解决了水口结瘤问题。铸坯各项技术指标达到较好水平。在稳定连铸生产,调整钢水成分和温度,以及不增加或少增加夹杂物等方面,均取得了明显效果。为提高小方坯连铸装备水平和技术措施开辟了新途径。 相似文献
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The production of continuously cast products that display very low centre segregation and thus more homogeneous properties is an important objective, particularly for high‐speed continuous casting of billets, in meeting increasingly stringent quality requirements. In addition to the well known methods of reducing macro‐segregation in continuous casting, inline deformation of the partially solidified strand, already used successfully in slab and bloom casting, offers an alternative for producing material with low segregation level. The present report considers the feasibility and effectiveness of mechanical soft reduction for the continuous casting of billets. The structural design of the soft reduction unit as a stand or segmental construction was investigated, as well as the influence of varying roll diameters. A strand of the existing billet caster S4 was modified for this purpose and soft reduction tests were conducted on spring steel grade 54SiCr6 at casting speeds between 3.30 and 3.60 m/min. The conclusions drawn from the test results as regards roll diameter, required reduction rate and necessary reduction force formed the basis for designing the soft reduction unit of the new billet caster SO that went in operation in March 2004. 相似文献
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针对宝铜电炉圆方坯连铸机末端电磁搅拌设备的投入使用,结合钢水浇铸的过热度、拉速以及二冷工艺,对比验证不同末端电磁搅拌工艺对连铸坯内部质量以及轧制钢管后对成品钢管成分均匀性、组织以及性能的影响,结果表明,经过组合电磁搅拌的钢管成分均匀性明显优于未使用末端电磁搅拌的工艺,冶金效果较理想,对钢管微观组织性能改善起到良好作用. 相似文献
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连铸混浇坯的过度时间及影响因素 总被引:1,自引:0,他引:1
为提高连铸比实现全连铸,鞍钢二炼钢在小方坯连浇不同钢种过渡段铸坯成分差异上做了试验研究,并指出小方坯连铸机增设钢水快速分析和快速节装置的必要性。 相似文献
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对中冶连铸公司(CCTEC)总承包的1台4流合金钢圆坯连铸机作了简要介绍,并着重介绍了圆坯连铸机的设计特点及在生产实践中得到的一些体会。生产20号钢,断面为Ф210mm,拉速控制在1.5~1.8m/min,中包钢水过热度控制在20~30℃,二冷比水量为0.4~0.5L/kg,生产的铸坯满足国标要求,可推广应用于相类似圆坯连铸机的设计。 相似文献
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Chao XIAO Jiong-ming ZHANG Yan-zhao LUO Xiao-dong WEI Lian WU Shun-xi WANG 《钢铁研究学报(英文版)》2013,20(11):13-20
Solidification behavior of continuously cast high carbon steel billets was investigated with an objective of producing high quality billets by determining the optimum final electromagnetic stirring (F-EMS) parameters. Characteristics of centerline segregation were analyzed for lots of billet samples collected from the plant through obtaining the carbon concentrations of drill chips, which were correlated with the operating parameters of the caster and stirrers, but a problem occurred that segregation control results of trial billets with the same casting and stirring parameters often have drastic fluctuations. An attempt was made to find out the induced reasons of this problem by measuring the electromagnetic torque, analyzing the secondary dendrite arm spacing (SDAS) and the corresponding cooling rate of the typical specimens, and observing the longitudinal profile of etched billet samples. Then a simple dynamic secondary cooling model was developed based on the solidified shell thickness control mode, by which the maximum carbon segregation index was reduced effectively, and thus the segregation fluctuation problem was basically solved. Finally, the most favourable stirring parameters were determined as the casting speed of 1.65 m/min, the liquid core thickness of 40 mm, stirring current of 360 A and frequency of 12 Hz. 相似文献
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埃及苏伊士钢铁公司的新建紧凑型钢厂 总被引:2,自引:0,他引:2
M.Hiebler E.Pollak 《钢铁》2002,37(3):17-20
一个采用现代化炼钢和连铸设备,年产60万t方坯的紧凑型钢厂,于2000年3月由奥钢联在埃及Adabia为苏伊士钢铁公司建成。钢厂应用新技术,面向国内和国际市场提供优质产品。电弧炉和连铸机的性能考核指标超过了合同保证值。在64h内共浇铸了5600t方坯,拉速高于4.3m/min. 相似文献