酸溶铝 酸不溶铝的分析

分析钢中微量元素Al和Als对于仪器分析比较困难，ARL利用PIM法(Peak Integral Method)测定钢中Al、Als，不同状态铝的铝燃烧曲线形状不一样，在不含酸不溶铝的燃烧曲线图中，曲线前期没有高于稳定强度的峰值存在，在含有酸不溶铝的样品的燃烧曲线前期存在一个高于稳定强度峰值，这个峰值的大小与酸不溶铝的含量成正比关系，PIM法利用这一现象，测定峰值强度和稳定状态强度，可得到Al和Als的含量。     

薄板坯连铸连轧低碳铝镇静钢中酸溶铝的作用研究

对薄板坯连铸连轧低碳铝镇静钢中酸溶铝的作用进行了研究.研究结果显示,对于薄板坯连铸连轧流程生产的低碳铝镇静钢,当钢中酸溶铝的质量分数在0.005%～0.043%时,酸溶铝对热轧板材的晶粒度及力学性能没有明显影响,但是对热轧板材再加热时的晶粒长大却有明显影响,随钢中酸溶铝含量的增加,钢的晶粒粗化温度不断提高.因此对于那些不需要强调焊接性能的普通热轧钢板,w(Als)可以控制在0.01%左右;对于那些需要强调焊接性能和某些特殊性能的钢板将w(Als)控制在0.02%～0.04%比较合适.     

无取向电工钢中酸溶铝含量对夹杂物的影响

 为提高无取向电工钢成品性能及优化生产,采用SEM-EDS等分析方法分别对比分析了无取向电工钢生产时,不同酸溶铝含量的生产工艺对钢中夹杂物的影响。研究表明,当钢中酸溶铝含量w(Als)为0.2%～0.4%时,精炼过程所生成的夹杂物为高熔点的Al2O3和球状的MgO-Al2O3类夹杂物;当钢中w(Als)小于0.005%时,精炼过程所生成的夹杂物主要为塑性硅铝锰酸盐类夹杂;各工位夹杂物平均数量呈递减的趋势,且w(Als)为02%～0.4%的高碱度渣系控制生成的夹杂物总量低于后者。     

LF炉无铝脱氧的工艺实践

介绍了承钢120t系统对钢中酸溶铝没有要求钢种的LF炉无铝脱氧实践。精炼过程中采用硅钙钡、硅钙粉、电石、碳化硅等对钢水进行无铝脱氧工艺,减少了钢水中的Als和Al2O3,精炼过程中加入Al2O3含量较低的精炼渣系,提高炉渣碱度,降低SiO2的活度,大幅提高硅的脱氧能力;优化钙处理工艺,对钢水进行深脱氧,通过夹杂物变性控制夹杂物的形态和尺寸。实践证明,对钢中酸溶铝没有要求的钢种采用无铝脱氧工艺后,没有降低钢水质量,提高了钢水可浇性,吨钢精炼费用降低2．96元／t。     

帘线钢中酸溶铝含量的变化及其对夹杂物的影响

 研究了采用LD－RH－LF－CC工艺流程生产帘线钢时,钢中酸溶铝含量的变化情况。研究发现,精炼过程中酸溶铝含量略有下降,但连铸过程中酸溶铝含量急剧下降。夹杂物中Al2O3含量随着酸溶铝含量的上升而逐渐增大。SiO2含量降低时夹杂物熔点提高。采用低碱度、低Al2O3含量的顶渣精炼工艺,严格控制钢中w(［Als］)在0.0005%～0.001%范围内,促进夹杂物上浮,有利于钢中氧化物夹杂的数量减少、尺寸细小和塑性化。     

影响弹簧钢质量的要素分析

对影响弹簧钢质量的诸要素,如钢中酸溶铝（Als）、脱氧工艺、钢中夹杂物和热处理脱碳层的形成及控制要素等进行了分析,得出以下结论：钢中酸溶铝量值是控制钢水质量的基础数据;从钢水精炼前到铸坯,夹杂物中Al2O3的质量分数减少70%左右,微观夹杂物的数量减少43%;弹簧钢设计中加入Cr、Mo、V等合金元素,可与C形成稳定的碳...     

08Al钢氮Als及夹杂物的变化规律

1 前言 08Al钢是我国应用较多的一种深冲用钢。多年来,我国冶金工作者为提高该钢的质量做了不少工作,并取得了一些成就。然而,与国外同级钢种相比,08Al钢在性能方面还显不足,其主要原因就是钢中的气体和夹杂控制不够稳定,Als的波动范围较大。本文系直接从现场取样分析的数据,探讨了08Al钢中的氮、Als及夹杂物在出钢至连铸过程中的变化规律,并用比较方法分析了不同加铝方式对钢中氮、Als及夹杂物的影响。     

涟钢CSP钢水酸溶铝的控制

涟钢CSP生产线自投产以来,钢中酸溶铝的控制不稳定,酸溶铝命中率较低。钢中酸溶铝控制过高,会造成铝的浪费;过低,则延长了LF精炼炉调铝的时间。在生产中可以通过调整钢中酸溶铝来控制钢中的夹杂物、组织性能,但不同钢种对酸溶铝的控制要求并不相同。通过现场试验研究,对不同钢种、不同终点氧含量采取不同的调铝工艺,有效提高了酸溶铝的命中率。     

150 tRH精炼终点钢水酸溶铝含量的控制

在参考80炉次SPHD、SPHE和IF钢生产数据的基础上,采用多元线性回归分析建立了用Al脱氧的RH精炼终点钢水酸溶铝含量-[Als]的计算模型,分析了RH脱碳结束时钢水氧活度、脱氧加铝量和钢水净循环时间对终点钢水酸溶铝含量的影响。结果表明,RH脱碳结束钢水氧活度、脱氧加铝量是影响终点钢水酸溶铝含量的重要因素;当RH脱碳后钢水温度、氧活度、炉渣中FeO+MnO含量-(FeO+MnO)以及钢水的净循环时间分别在1 600℃、2×10^-4、15%和8 min时,要控制终点钢水酸溶铝为0.02%~0.05%须在RH脱氧过程中控制加铝量0.86~1.53 kg/t。     

酸溶铝在ML08A1钢中行为的研究

对ML08AI钢中酸溶铝的行为进行了分析，探讨了酸溶铝对夹杂物和钢材性能的影响，认为在生产此钢种时，应有效提高钢的纯净度，控制钢中全铝含量在0．03％～0．06％，酸溶铝与总铝的比值不小于95％。     

熔炼次数对M17返回料合金成分、组织和性能的影响

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。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<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     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

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,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

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     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

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     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

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,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

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.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

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.