加热温度及时间对20MnSi螺纹钢筋性能的影响

该研究试验表明，对一火成材的２０ＭｎＳｉⅡ级螺纹钢筋而言加热到１２５０℃奥氏体化５ｍｉｎ，可获得较佳的强度。经正火的２０ＭｎＳｉ螺纹钢筋仅存在冶炼因素对强度的影响。它对σｓ的影响占７０％，对σｂ的影响占８３％，轧制因素对σ２与σｂ的影响分别可达２７与２１ＭＰａ。     

粒状贝氏体组织对200MnSi带肋钢筋性能的影响

２０ＭｎＳｉ带肋钢筋进行拉伸和冷弯试验时,有σｓ有明显和脆断现象发生。金相显微组织检查发现,有粒状贝氏体存在,这是导致σｓ不明显和脆断的根源。而粒状贝氏体的形成主要取决于钢的化学成分,尤其与Ｍｎ含量偏高（〉１．６％）及残留元素Ｍｏ含量有着密切联系,也与轧制时的加热温度和冷却速度有关。因此,必须严格控制２０ＭｎＳｉ钢中的残留元素含量和Ｍｎ偏析,严格轧制工艺。     

20MnSiⅡ级钢筋屈服强度测定标准对比研究

本文简述了２０ＭｎＳｉⅡ级钢筋条件屈服强度σｔ０．４３的测量过程结果,通过对不同成分、不同规格的Ⅱ级钢筋进行测量,对同一支试样进行了σｔ０．４３和下屈服点σｓ１的测量,结果表明σｓ１≤σｔ０．４３中用σｓ１代替σｔ０．４３是完全可行的。     

生产20MnSi小方坯预防中间包水口堵塞的措施

石横特钢厂连钎生产２０ＭｎＳｉ小方坯时，钢中全Ａｌ量是中间包水口堵塞的主要原因。通过分析钢中Ａｌ的来源，采限了改变电炉冶炼工艺，控制「Ｏ」含量；合理使用铁合金；全程泡沫渣冶炼等措施，控制「Ａｌ」小于０．００６％，有效地防止了水口堵塞。     

特殊钢信息

Ｘ９９２０１２０ＭｎＳｉ螺纹钢筋脆断原因分析２０ＭｎＳｉ螺纹钢筋广泛用于工业及民用建筑,是新疆八一钢铁集团公司的主导产品,性能优良,质量稳定。影响２０ＭｎＳｉ螺纹钢筋脆断的主要原因：一是钢材成分严重不均匀;二是钢筋表面大量增碳。钢水成分是否均匀与钢包...     

热轧带肋钢筋钒钛微合金化生产试验

在１０ｔ电炉和１５ｔ转炉上进行钒微合金化冶炼及轧制钒钛钢筋的试验。按英标ＢＳ４４４９组织了大指一生产。按ＧＢ１４９９－９１ ＲＬ４００原Ⅲ级２０ＭｎＳｉＶ，２０ＭｎＳｉ进行了小批量试制；ＲＬ５４０原Ⅲ级２０ＭｎＳｉＶ，２０ＭｎＳｉ进行了小批量试制；ＲＬ５４０原Ⅳ级４０Ｓｉ２ＭｎＶ进行了多年的工业性试验生产；通过本文对比分析，以求达到国际ＧＢ１４９９－９８ ３个级别ＨＲＢ３３５、４００，５００的各项     

攀钢汽车用优质钢的开发

介绍了攀钢用１２０ｔ大型转炉生产２０ＣｒＭｎＴｉ,４０ＭｎＢ,６０Ｓｉ２Ｍｎ,５５ＳｉＭｎＶＢ钢的工艺及性能。通过采用出钢前向钢包内加入钙基预脱氧剂,喂铝线,喂复合包芯线处理钢液,以及对铬铁合金化工艺进行改进等技术措施,解决了钢的成分控制问题,保证了钢才的淬透性和清洁度,生产出的２０ＣｒＭｎＴｉ,４０ＭｎＢ,５５ＳｉｍＮＶＢ等钢种为汽车用优质钢。     

20MnSiⅡ级螺纹钢筋σt0.43与σSI对比的研究

简述了２０ＭｎＳｉⅡ级钢筋条件屈服σｔ０．４３的测量过程及测定结果，通过对不同万分，不同规格的Ⅱ级钢筋进行测量。对同一支试样进行了σｔ０．４３和下屈服点σＳＩ的测量，结果表明σＳＩ≤σｔ０．４３在生产检验中用σＳＩ代替σｔ０．４３是完全可行的。     

含钒钛铁水的质量,标准研究

论述了钒渣品痊，回收率与铁水中「Ｖ」、「Ｓｉ」加「Ｔｉ」的关系，铁水中「Ｓ」与「Ｓｉ」加「Ｔｉ」的关系，「Ｓ」含量对炼网指标的影响。     

锰矿造渣对钢水残锰的影响

总结了锰矿在造渣过程中对钢水残锰的影响。钢水中「Ｍｎ」含量很大程度取决于入炉铁水「Ｍｎ」含量，但终点钢水温度对它的影响也有重要作用；锰矿加入量愈大，（ＭｎＯ）量愈高，钢水「Ｍｎ」残量增加得愈多；另外，高碱度也不利于钢水「Ｍｎ」残的增加。     

Introducing Two Central Enterprises to Integrate Rare Earth Industry,Shandong Rare Earth Group Breaks Surface

正With the signing of"Letter of intention for Propelling Integration of Shandong Rare Earth Enterprises"between Shandong Province Commission Of Economy and Informatization,China IronSteel Research Institute Group("China Steel Institute"),and China Rare MetalsRare Earth Co.,Ltd("China Rare Earth"),the"Shandong Rare Earth Group"jointly set up by the 3 units thus broke surface.On August 9,reporters of the China Economic Herald learned from Shandong Province     

China is Planning to Raise rare Earth Resource Tax Again

正In the face of the current situation of the lost WTO dispute on rare earth,and cancellation of export tariff for partial rare earth products,efforts of regulation and integration on rare earth by the state government will again be tightened.Reporters of the Economic Information Daily recently learned from authoritative sources that relevant ministries are     

Refined Copper Production by Province or City in 2014

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Aluminium Production by Province or City in 2014

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Fabricated Copper Production by Province or City in 2014

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Refined Copper Production by Province or City in 2014

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Aluminium Production by Province or City in 2014

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Chinalco Signed Framework Agreement for Strategic Cooperation with Harbin Municipal Government

正Last month,Chinalco signed framework agreement for strategic cooperation with Harbin Municipal Government in Harbin Xiong Weiping,Chairman of Chinalco,said that based on the strategic deployment to build world top-class mining company with the highest growth potential,Chinalco was now concentrating all efforts on making strategic transition and structural adjustment,strategic cooperation with the local governments where     

Jiangxi Promotes Jiangxi Copper Corporation To Become The World's Most Competitive Mining Company

<正>According to the latest info from Jiangxi Province State-owned Assets Supervision and Administration Commission,Jiangxi Copper Corporation was approved to become the first pilot enterprise for deepening reform.Contents of the pilot work is"Three Self"(self expansion,self decision-making,self     

Journal of Rare Earths Contents List of Vol.32(2014)

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