60kg级低屈强比耐火钢的实验研究

对一种低屈强比建筑用耐火钢进行实验研究，介绍了实验钢的化学成分、实验工艺、力学性能等，重点论述了合金元素、组织等对钢的屈强比、高温强度的影响。结果表明，该钢具有良好的综合机械性能．组织为铁素体基体加贝氏体第二相．因此获得低的屈强比。合金元素Cr、Mo、Nb等的加入有效地提高了钢的高温性能。     

60kg级低屈强比耐火钢的试验研究

对一种低屈强比建筑用耐火钢进行试验研究,介绍了试验钢的化学成分、试验工艺、力学性能等,重点论述了合金元素、组织等对钢的屈强比、高温强度的影响。结果表明,该钢具有良好的综合机械性能,组织为铁素体基体加贝氏体第二相,因此获得低的屈强比。合金元素Cr、Mo、Nb等的加入有效地提高了钢的高温性能。     

成分对经济型热轧双相钢性能的影响研究

在试验室研究了不添加贵重合金元素的经济型热轧铁素体-马氏体双相(DP)钢的成分对组织力学性能的影响.结果表明:添加微量的Nb和Ti元素可提高钢的抗拉强度,同时也可提高钢的屈服强度和屈强比;锰过高或过低都会阻碍组织中马氏体的形成;适当增加硅可以提高钢的抗拉强度并降低延伸率.通过成分控制和配合适当的控轧、控冷工艺可满足DP600和DP800热轧双相钢的性能要求.     

高层建筑用Q420GJC钢的研制及应用

利用Nb、Ti等元素微合金化,配合控轧控冷工艺,开发了低屈强比、高强度Q420GJC钢。对其工业性试制钢板进行了拉伸、冲击、组织结构检验及焊接性能试验,结果显示,研制的钢种组织为铁素体+珠光体且铁素体比例占50%以上,具有优良的综合性能,屈强比≤0.81,Rm≥560 MPa,满足高层建筑用钢技术要求,已成功实现工程应用。     

回火温度对Nb-Ti微合金化Mn系低碳贝氏体钢屈强比的影响

测试了Nb-Ti微合金化Mn系低碳贝氏体钢经不同温度回火后的拉伸性能,研究了回火温度对实验钢屈强比(Yield ratio)的影响,通过引入Swift公式分析了实验钢经不同温度回火后的应变硬化指数n和材料常数b的变化规律,建立了显微组织与屈强比之间的关系模型。结果表明:实验钢在280～600℃温度范围内回火2 h后,随着回火温度的升高,屈强比和材料常数b逐渐增加,应变硬化指数n呈现下降趋势,同时屈强比和ln(b/n~2)呈线性递增关系。显微分析表明,回火后屈强比的变化主要是由于回火过程中贝氏体板条的粗化造成的;同时结合透射电镜(TEM)观察讨论了回火过程中微合金化元素Nb, Ti的碳氮化物析出对贝氏体钢屈强比的影响。     

强化机制对高强度桥梁钢Q500qE屈强比的影响

通过化学成分设计以及TMCP过程控制研究了不同的强化机制对高强度桥梁钢Q500QE屈强比的影响。结果表明,通过增加固溶元素Mn、Cr的含量和降低析出强化元素Nb的含量,可有效降低屈强比。晶粒细化有利于强度和韧性的提高,但对屈强比不利。相比之下,相变强化是实现高强度和低屈强比的最佳途径。热轧后采用分段冷却工艺可获得铁素体+贝氏体的双相组织。通过调整铁素体和贝氏体相的比例和硬度,可有效控制屈强比。     

深冲用钢DC04热轧原料的开发与试制

为了适应市场汽车业及家电业对超低碳钢深冲性能的需求,拓展包钢产品的品种,提升包钢产品的质量,为后续投产的冷轧生产线开发试制超深冲用钢做技术储备,包钢稀土钢板材厂对深冲用钢DC04热轧原料进行开发与试制,该钢种通过加入合金元素Ti控制间隙原子含量,使钢质纯净,采用高温终轧与卷取的工艺,控制碳化物的析出与固溶,得到低屈服强度、低屈强比的深冲原料,满足下游工序要求。     

Mo对耐火钢组织性能的影响

对三种含Mo耐火钢组织和性能进行了实验分析,发现合金元素Mo在耐火钢中的主要作用是通过提高贝氏体淬透性来满足钢的高温性能.从组织学角度看,降低合金中的Mo含量而增加其它提高贝氏体淬透性的元素也能够满足耐火钢成分设计要求.探讨了设计低Mo或无Mo耐火钢的可能性.     

免涂装低屈强比耐候桥梁钢的开发应用

通过优化成分设计以及轧制、热处理工艺,成功开发出8 ～ 80 mm厚度的免涂装低屈强比耐候桥梁钢.针对免涂装低屈强比耐候桥梁钢的工艺、金相组织和焊接性进行分析研究,结果表明:耐候桥梁钢Q345qENH～ Q690qENH的屈强比可以通过适量铁素体+不同形态贝氏体组织配比进行调控,使低温冲击韧性、低屈强比和耐候性同时得到...     

低屈强比高强度结构钢的发展概况

从低屈强比的物理内涵、影响因素以及低屈强比结构钢在国内外工程上的应用等方面,总结了低屈强比高强度钢的发展现状,同时指出目前生产面临的问题,并对其未来的发展作出展望。     

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.