共查询到18条相似文献,搜索用时 109 毫秒
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由于20MnVB钢的特殊性导致其综合机械性能不稳定,一次合格率较低。此试验应用正交试验设计,对化学成分固定的20MnVB钢的热处理工艺、组织、性能之间关系进行了分析,选择出最佳的热处理工艺,以指导生产检验,提高一次合格率和检验合格率,降低检验成本。 相似文献
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本主要介绍了连铸生产20MnVB的工艺和试制结果。20MnVB钢水易氧化,连铸坯裂纹敏感性强。采取相应的措施。开发取得了成功。 相似文献
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本文研究了钛和硼对转炉和平炉治炼20MnVB钢淬透性的影响。提出了有效硼和过剩钛决定20MnVB钢淬透性带宽度的参量,并确定了最佳值的范围,提出了获得20MnVB钢理想淬透性带的最佳含钛量和含硼量。 相似文献
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本文提出了ML15MnVB螺栓用钢的生产质量控制要点,分析了马钢在ML15MnVB钢生产中所采取的质量控制措施以及所取得的成效。 相似文献
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一、前言20MnVB 钢作为东风载重汽车后桥大模数齿轮材料,承受着较大的载荷。齿轮加工中需经过940~960℃渗碳淬火处理,这就要求材料在高温状态下具有晶粒不粗化倾向。第二汽车制造厂,根据齿轮生产和使用的需要,对20MnVB 钢的奥氏体晶粒度提出了严格的技术要求,即在960℃加热,保温 相似文献
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本文主要介绍了化学成份、残余元素含量和予热处理工艺对硼钢奥氏体晶粒度和淬透性的影响。通过20MnVB 钢的研究,指出影响硼钢奥氏体晶粒度和淬透性的主要元素以及它们的最佳含量范围;介绍了予热处理工艺改善硼钢奥氏体晶粒度的试验和生产应用情况,提出了效果较佳和实用的工艺制度。分析讨论了它们的机制,对指导硼钢的生产和机械零件的制造都有一定的实际意义。 相似文献
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高强度螺栓用钢的开发 总被引:2,自引:0,他引:2
为开发经济实用,适合我国国情的高强度螺全用钢,在ML15MnVB的基础上,设计ML20MnVB钢种,对碳、硼的含量进行控制,采用合适的热处理制度并通过一定的工艺控制,达到了预期的目的,新钢种具有良好的应用前景。 相似文献
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20Mn23AlV高锰无磁钢的高铝含量导致连铸过程中钢水与连铸保护渣的剧烈反应,连铸坯产生大量裂纹缺陷,影响其连铸正常生产。为提高铸坯质量,保证20Mn23AlV高锰钢连铸生产顺行,本研究对现场生产20Mn23AlV的连铸工艺和采用的连铸保护渣进行了系统的研究和分析。通过实验室的感应加热炉进行渣-金反应试验,并结合化学分析和扫描电镜等方法研究开发出20Mn23AlV低反应性连铸保护渣,并采用工业试验证明采用低反应性连铸保护渣可以消除连铸坯表面裂纹缺陷,20Mn23AlV高锰钢铸坯修磨量可由8%降低至1%。 相似文献
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介绍了20#管坯钢的生产试验工艺,采取了拉碳法脱碳、钢包底吹氩及喂丝、保护浇铸、合理控制拉速等有效措施,解决了生产中存在的质量问题,为下一步的生产提供了理论和实践依据。 相似文献
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根据市场上对单件20t以上大型铸钢件的需求,结合广钢电炉炼钢厂的场地和设备特点,通过采取各种措施并制定合适的浇铸工艺,成功地在电炉炼钢厂生产了单件最大40t的大型铸钢件,为在电炉炼钢厂生产大型铸钢件积累了一定的经验。 相似文献
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Columnar-grained QSn6. 5-0. 1 alloy slabs with a width of 70 mm and thickness of 10 mm were fabricated by heating-cooling combined mold( HCCM) horizontal continuous casting. The effects of process parameters on solidification microstructure,surface quality,composition segregation and mechanical properties were studied. The results showed that the slabs with good surface quality,excellent mechanical properties and no obvious segregation could be prepared at the melt casting temperature of 1 250 ℃,the heating-mold temperature of 1 150- 1 200℃,the cooling water flow rate of 600 L / h and the casting speed of 20- 80 mm / min. The slabs had the yield strength of 124- 155 MPa,the elongation rate of 46. 6%- 56. 3% and the surface roughness of 0. 22- 0. 55μm,which enabled them to be directly processed without subsequent milling surface. The ratio of Sn content in the surface to that in the core was 0. 83- 1. 10,with an average value close to 1. 0,and not obviously influenced by process parameters. When the casting speed increased from 20 to 80 mm / min,the grain size changed little if the other process parameters were the same. When the heating-mold temperature increased from 1 150 to 1 200℃,the grain size was obviously refined and became more uniform if the casting speed was the same. Within the range of the casting speed at which the columnar grain structure could be obtained,the columnar grain size was mainly influenced by the heating-mold temperature. 相似文献
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0Cr18Ni9奥氏体不锈钢的生产流程为铁水脱磷预处理-75 t转炉-VOD-LF-200 mm×1 200 mm坯连铸工艺。分析了连铸过程20 t中间包覆盖剂(/%:40.54CaO,28.89Al2O3,7.8SiO2,6.32MgO,1.84C,碱度5.2)组分变化,及钢中氧、夹杂物去除效果。结果表明,采用高碱度中间包覆盖剂时,多炉连浇后覆盖剂吸收钢中硅酸类夹杂物效果明显,0Cr18Ni9不锈钢中平均氧含量由LF钢水中的56.5×10-6,降低到中间包钢水中的37.5×10-6和铸坯的33.3×10-6,铸坯中夹杂物数量及大小较LF后有明显降低,高碱度中间包覆盖剂对去除20μm以上的大颗粒夹杂效果明显。 相似文献
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The influence of mold length and mold heat transfer on the conventional hot-top D.C. continuous casting process was studied through numerical simulations and experiments with horizontally cast 20 mm diameter lead and zinc rods. The minimum casting speed was found to be a nonlinear function of the mold length. For short molds, an inverse relationship between mold length and minimum casting speed was observed. However, the minimum casting speed for zinc cast from molds longer than 12 mm was constant at 2.5 mm/s. For lead cast in molds longer than 12 mm, the minimum observed casting speed was constant at 4.0 mm/s. The observed nonlinear relationship between minimum casting speed and mold length was predicted using a numerical model of the process. For this, an analytical expression for the mold boundary conditions was derived which included the influence of gas gap formation between the rod and the mold due to thermoelastic deformations of both the rod and the mold. Correlation between observed and predicted behavior was demonstrated for both the lead and zinc rods. Maximum casting speed was observed to increase with increased mold length; however, this speed was found to be critically dependent on process attributes such as mold and pinch wheel alignment and mold lubrication. 相似文献