用添加Ba、Mg的SiCaAlFe合金对不锈钢还原脱磷的研究

以316L不锈钢为还原脱磷对象,考察钙合金中加入钡、镁对还原脱磷、脱硫的影响.结果表明钙合金中添加钡、镁能提高了其还原脱磷和脱硫能力,但如果想得到较高的脱磷率,一方面合金中钙含量必须增加,从合金成本和实验结果分析,将合金中的钙的质量分数提高到15%～20%是可行的;另一方面增加还原脱磷剂的加入量.在还原脱磷过程中发现,SiAlBaCa未出现回磷现象,且其脱硫效果最好.     

含钡合金对冷镦钢脱氧的试验研究

在250kg感应炉上对冷镦钢进行了含钡合金脱氧的试验研究。试验中钡系合金主要选取SiAlBaCa和SiAlBaCaSr及用于钙处理的SiCa、SiCaBa包芯线。选用FeSiAl作为对比脱氧剂，考察了钡系合金脱氧的全氧含量，脱氧产物的分布、尺寸和形貌，探讨了钡系合金脱氧和对夹杂物的变质作用的机理。试验中发现，含钡合金用于钢液脱氧，可获得较低的氧含量，其脱氧产物易于上浮且速度很快，钢中的夹杂物形态发生改善呈球形，而且均匀分布于钢中。     

含钡合金在钢液中的脱氧行为研究

在MoSi2炉上采用MgO质坩蜗对钢管进行了含钡合金脱氧行为的研究。实验中钡系合金主要选取SiAUBa、SiCaBa、SiAlBaCa、SiAlBeCaSr及用于钙处理的SiCa包芯线，选用Al作为对比脱氧剂，考察了钡系合金脱氧的全氧含量，脱氧产物的分布、尺寸和形貌，探讨了钡系合金脱氧和对夹杂物变性作用的机理。     

不锈钢还原脱磷及其渣子的处理

1.前言磷会严重降低不锈钢的加工性、抗腐蚀性。在超纯不锈钢中,磷含量需要低于0.005%。一般不锈钢的磷含量≤0.035%(GB1220—75)。随着废钢的循环使用,钢中的磷因无法利用氧化法有效地脱除而愈聚愈多,从而造成市场上有些不锈钢返回料的磷含量高达0.047—0.087%。因此,深入研     

含钡合金对硬线钢的脱氧试验

用 2 5 0kg感应炉对 0 .81%～ 0 .84 %C硬线钢进行了脱氧试验。试验用含钡合金为SiAlBa和SiAlBaCaSr ,并与Al和FeSiAl脱氧效果进行对比。试验发现 ,SiAlBaCaSr合金对硬线钢的脱氧效果优于SiAlBa、Al和FeSiAl脱氧剂 ,氧含量可达 2 0× 10 - 6 ,脱氧产物易于上浮且速度快 ,钢中夹杂物基本呈球形且分布均匀。     

含钡硅系合金取代铝脱氧的几个理论问题

工业试验的和理论分析表明，含钡硅系合金具有很强的脱氧能力，其取代铝的系数在（１．１－１．５）：１之间。分析了其脱氧产物排除速度较快，从而夹杂物总量显著降低的原因。     

混合稀土金属在不锈钢还原脱磷中的应用研究

从理论上分析了稀土对钢液还原脱磷的可能性,并在5kg真空感应电炉内用La-Ce-Pr-Nd混合稀土金属对1Cr18Ni9Ti不锈钢进行了还原脱磷试验。研究表明,在较高的真空度6.6×10-3Pa及精炼温度1500℃～1550℃下,稀土具有较强的脱氧、脱硫及脱磷能力。加入0.32%的稀土,脱磷率可达到44%,钢液的含磷量可降至0.010%左右。     

锰硅合金还原脱磷实验研究

本文介绍了在铁水包里进行锰硅合金还原脱磷的实验。研究结果表明,使用 CaSi-CaF_2脱磷剂,采用喷吹法,平均脱磷率达34%以上,最高脱磷率达65%。     

Deoxidation Behavior of Alloys Bearing Barium in Molten Steel

Asdeoxidizers ,siliconandmanganesewereusedinearlysteelmaking ,andaluminiumwasalsoadoptedsevendecadesago .Recently ,variouscom plexdeoxidizershavebeendeveloped ,amongwhichthealloysbearingbariumattractmoreattention .In196 9,HiltyDCetal[1] usedalloysbearingbariumtotreatmoltensteelforthefirsttime .Inthe 1970s ,variousalloysbearingbariumwereusedtotreatmorethan 2 0steelgradesinAmerica ,JapanandformerSoviet ,andmeantimealargeamountofpa persandbookswerepublished[2 -6] .InChina ,alloybearingbariumwa…     

用钡合金对齿轮钢脱氧的工艺研究

为提高钢的洁净度,在50t EAF-60 t LF流程中采用钡合金对齿轮钢进行脱氧试验,通过控制电炉出钢碳含量、充分地铝预脱氧并用钡合金进行终脱氧和夹杂物变性,可使铬铝系SCM822H齿轮钢的氧含量降至0．0015％以下。     

Investigation on Dephosphorization of Stainless Steel

In the scale of ironmaking and steelmaking, the dephosphorization can be divided into four classes. The first level which is known very well by metallurgists is the dephosphorization for carbon steels and low alloy steels. The second level is that included in the pretreatment process of hot metal. It differs from the first level as it must consider how to treat the selective oxidation of ［P］ and ［C］. Furthermore, The contradictory of dephosphorization and desulphurization has to be harmonized. The third level is that for high alloy steels and the fourth is that for ferroalloys. In these cases, two technical ways either oxidizing dephosphorization or reducing dephosphorization can be selected. Whether which one is chosen, the key problem is to lower down phosphorous content efficiently meanwhile to keep the concentration of Cr and/or Mn almost lossless. 　　The cheapest raw materials for the production of high alloy steel are the returning scrap of that steel. Raising the proportion of the returning scraps in the total amount of raw materials is a very important measure to decrease the production cost. In order to avoid an obvious oxidation of Cr, Mn and so on during that melting process it is impossible to adopt the oxidational dephosphorization procedures which is generally carried out in the production of low alloy steel. In this case, after returning several times the phosphorous content in the scraps is accumulated. And then it gradually approaches to the level specified in the standard of the steel. Finally, it will become a waste. It was estimated that the market demand on high alloy steels as stainless steels would rapidly grow. So the scraps containing low phosphorous is urgently needed in a great deal. 　　On the other hand, the standards of some high alloy steels, which are designated for extremely severe environment only, allow a very low phosphorous content. For example, it is claimed that W［P］<0.015 %—0.020 % if the stainless steel products will contact with urea or nitric acid. If the resistance to corrosive fatigue and welding crack is highlighted the phosphorous content should be decreased to less than (100—50)×10－4 %. And Koros P J et al estimated that dephosphorous to 14×10－4 % will be wanted［1］. 　　So far no technology for dephosphorization of stainless steels can be widely adopted in industrial scale. This will be one of the major research projects in the coming century. This paper devotes to a discussion on the strategy of oxidational dephosphorization and the improvement of the reductional dephosphorization.     

低成本冶炼高质量轴承钢工艺探讨

分析了影响GCr15轴承钢质量的主要因素及各冶炼工序对轴承钢质量的影响 ,提出了非真空钢包精炼及钡合金处理轴承钢工艺 ,采用该工艺可使轴承钢w (O)降到 10× 10 -6以下 ,钡合金处理钢的疲劳寿命比真空铝处理钢高 6 3.5 5 % ,而每吨钢成本比真空处理钢降低 10 0元。同时 ,对转炉冶炼轴承钢工艺进行了探讨。     

不锈钢氧化脱磷过程的热力学分析

结合有关的热力学数据，从碳、铬、磷选择性氧化的角度，研究了各参数对不锈钢脱磷热力学条件及工艺的影响。热力学计算结果表明，BaO-CaO系渣更适合不锈钢脱磷，应适当提高初始碳含量并降低渣中P2O5含量以利脱磷保铬。这对不锈钢脱磷工艺的制定具有指导意义。     

钛稳定超纯铁素体不锈钢硅铝复合脱氧的试验研究

 为改进超纯铁素体不锈钢的脱氧工艺,提高夹杂物控制水平,在硅钼高温电阻炉内对钛稳定超纯铁素体不锈钢的精炼过程进行了试验研究。结合热力学计算,研究了不同Si、Al含量(质量分数,下同)比值的硅铝合金的脱氧效果,以及脱氧、钛合金化和钙处理后钢中典型夹杂物的组成和形貌及粒度分布。结果表明：钢中初始氧含量相近的条件下,硅铝合金复合脱氧的钢中酸溶铝、全氧量与纯铝脱氧结果相近。硅铝复合脱氧后钢中夹杂物主要为(MgO-)Al2O3-SiO2复合脱氧产物。钛合金化后夹杂物的类型主要为Al2O3-MgO-(SiO2)-TiOx复合夹杂物和TiN。钙处理后的夹杂物主要为球形的MgO-Al2O3-CaO-SiO2-TiOx类复合氧化物。采用硅铝合金复合脱氧比纯铝脱氧钢的夹杂物的总数量、总面积和平均粒径均要小。