20Cr13不锈钢25 t VOD-LF硅脱氧精炼工艺的生产试验

试验20Cr13不锈钢(/%:0. 20C,0. 37Si,0. 54Mn,0. 030P,0. 002S,12. 22Cr,0. 007Al)的生产流程为25tEAF-VOD-LF-模铸。分析了[Si]和炉渣碱度对渣中(Cr_2O_3)含量的影响和用硅脱氧工艺炉渣的脱硫效率。结果表明,20Cr13不锈钢VOD-LF硅脱氧精炼工艺铬的回收率为99. 27%;LF精炼开始的[S]为0. 014%,精炼结束[S]为0.007%,能满足实际生产需求;并可节约铝锭和高碳铬铁,降低20Cr13不锈钢生产成本。

轧机轴承用钢GCr15SiMn的开发

介绍了轧机轴承用钢GCr15SiMn的开发及关键工艺,采用真空脱气+连铸+连轧工艺,通过低有害元素控制、精炼高效脱氧、连铸轻压下、中间包感应加热和控轧控冷等技术,使轧机轴承用钢具备纯净度高、有害元素含量低和组织均匀性高的特性,能够满足用户要求,产品质量达到国际先进水平。

影响无氧铜生产质量的因素与控制措施

针对无氧铜生产的工艺特点 ,分析了原辅材料、熔铸工艺及检测方法等对无氧铜产品质量的影响 ,并结合国内无氧铜生产现状 ,提出了保证和稳定无氧铜产品质量的控制措施。

低氧高钛铁应用及研究进展

近年来随着特种不锈钢、管线钢、汽车用钢、海洋钢需求量急剧增加,高钛铁合金的市场需求也越来越大,对高钛铁中氧等杂质残留量也要求越来越苛刻。另外,随着喂丝精炼技术的普及,对低氧低残留高钛铁包芯线的需求量越来越大。我国成功开发出氟盐铝热法还原制备低氧低残留高钛铁超细粉体,制备出氧含量<2.0%,铝含量<4.0%及硅含量<0.5%,钒、锰、碳、硫、磷等杂质元素含量几乎为零的高钛铁超细粉体,并在筹建万吨级规模的生产线。同时我国还开发出分步深度还原制备低氧低残留高钛铁新工艺,制备出氧含量0.23%,铝含量1.5%优质高钛铁,并在进行放大试验。

Study on Laboratory Method for Refining of SR Diesel Fuel

The method for refining the straight-run diesel fuel was studied in laboratory scale in order to make the acid number of diesel fraction comply with the standard while removing the naphthenic acids contained in diesel without causing environmental pollution. After comparing the effect of refining using three solvents, the isopropyl alcohol-HOA was specified as the best solvent. Meanwhile, the relationship between the acid number of diesel fraction and the amount of solvent used and the relationship between the concentration of solvent and temperature and the stability of diesel in terms of its acid number were also investigated. Experimental results had shown that when the mass fraction of the HOA-IPA solvent was 20% at a dosage of 17 mL of the solvent and a temperature of 30℃, the acid number of the refined diesel fraction was 0.015 mg KOH/g with a good stability of acidity in the diesel fraction.