共查询到20条相似文献,搜索用时 78 毫秒
1.
采取转炉高拉碳出钢、双渣法冶炼、LF高碱度渣精炼、RH真空脱气、连铸加强保护浇铸及控制钢液过热度等措施,有效控制GCr15轴承钢中的氧、氮、硫、磷、钛等元素及夹杂物含量。试验表明:提高转炉出钢碳质量分数,有利于降低钢中的氧质量分数;随着炉渣碱度的升高,钢液中ω(O)大幅降低;GCr15轴承钢经过RH真空处理,钢液中的ω(TO)从0.002 8%下降到0.000 9%;双渣法冶炼可以提高转炉冶炼前期的脱磷率;LF精炼和连铸过程增氮,RH过程降氮;LF精炼过程是控制ω(Ti)的关键;夹杂物和碳化物都得到有效控制。 相似文献
2.
3.
4.
5.
1引言
关于钛稳定不锈钢不可避免地生成某种TiN,在连铸过程中,有意添加的钛会在接近钢水的液相线温度时与钢水中的残余氮反应。这种固体物质在连铸过程中的沉淀会引起水口堵塞、结晶器粘结和板坯表面缺陷,当氮化钛被结晶器保护渣吸收,它还会影响结晶器保护渣的润滑性能。但是,氮化钛在结晶器保护渣中的溶解度很小,按质量计算〈0.5%。因此,预计钛会按氮化物氧化(而生成二氧化钛和氮气),以氧化物的形式进入结晶器保护渣中;(而结晶器保护渣中的)二氧化硅很可能是一种氧化剂,它与溶解于钢水中的钛直接反应而形成钛氧化物。这些氧化物可能包括TiO2和一些如Ti3O5低价氧化物。 相似文献
6.
用扫描电镜(SEM/EDS)分析了高钛焊丝钢连铸水口结瘤物和钢液中夹杂物的形貌和组成,结果表明:结瘤物的主要组成是[TiOx]和凝钢;精炼结束后钢液中的夹杂物主要是[MnO-Al2O3-SiO2-TiOx]、[MgO-Al2O3-TiOx]和[TiOx]类夹杂物;钢液中大量的高熔点含钛夹杂物是导致水口结瘤的主要原因。对钢液中的Al-Ti-O平衡和钢渣间的平衡进行了热力学计算,结果表明:当[w([Al])/w([Ti])<0.15]时,氧优先与钛结合,反之优先与铝结合;当钢包渣中的[w((FeO))][<]0.05%、[w((SiO2))][<]15%时,可避免钛被炉渣氧化。通过对冶炼工艺参数和操作过程的优化,钢液中[TiOx]的质量分数从0.002 4%降低到0.001 0%以下,钢液的可浇性得到明显改善。 相似文献
7.
8.
采用Thermo-Calc软件、热模拟及扫描电镜研究高Ti-Q550钢中微合金的析出规律。采用Thermo-Calc软件计算不同温度下Nb、Ti的析出规律,钛含量对钢中Nb、Ti析出规律及A3的影响。采用热模拟和扫描电镜研究钢中铌相的析出温度。计算结果表明,钛相的析出温度为1498℃,铌相析出温度为1251℃;随着钢中钛含量的增加,(Nb,Ti)C相析出温度和A3温度升高,但铌在钢中的固溶量降低;当钛的质量分数小于0. 08%时,Ti(N,C)相析出温度随钛含量增加而升高,但当钛的质量分数大于0. 08%时,相析出温度基本不变,钛在钢中的固溶量随钛含量增加而增加。 相似文献
9.
在电炉冶炼中通过氧化去除钢水中的残余钛,使出钢终点w(Ti)≤0.001 0%,精炼过程中使用低钛合金、造渣料、辅助材料等使精炼渣碱度控制在4~6,精炼过程的钛增幅≤0.001 2%,钢中成品w(Ti)≤0.003 0%,可提高轴承的疲劳寿命。 相似文献
10.
11.
实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。 相似文献
12.
13.
14.
<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic 相似文献
15.
正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field, 相似文献
16.
《China Nonferrous Metals Monthly》2014,(10)
正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF 相似文献
17.
《China Nonferrous Metals Monthly》2014,(10)
正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure 相似文献
18.
《China Nonferrous Metals Monthly》2014,(10)
正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year, 相似文献
19.
《China Nonferrous Metals Monthly》2014,(12)
正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform. 相似文献
20.
正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness. 相似文献