双相钢冷拔钢丝的自然时效

研究了09Mn2Si热轧态双相钢冷拔钢丝经6个月自然时效后的力学性能和显微组织的变化。结果发现,无论是冷拔态钢丝还是冷拔-回复态钢丝,均呈现明显的自然时效现象。冷拔态钢丝经6个月自然时效后,强度提高而塑性降低。但是,对于冷拔-回复态钢,不仅强度提高,而且塑性也有明显改善。用透射电镜对钢丝金属薄膜进行了组织观察,并对两种不同的自然时效特性进行了讨论。     

环保易切削黄铜的研究现状及发展前景

传统易切削黄铜多为含铅黄铜，如HPb59—1、HPb63—3等，广泛应用于机械制造业。含铅黄铜零部件报废后，将以各种途径污染环境。近年来，随着环保呼声的不断高涨，促进了无铅易切削黄铜的研制。本文详细叙述了国外对Bi黄铜的研究结果，即切削角度、切屑类型、接触长度同铋含量的关系，以及国内在Si黄铜方面的研究进展，并对无铅黄铜特别是Bi黄铜的开发应用前景进行了展望。     

低碳硅-铌双相钢丝及耐磨筛网

研究了不同化学成分和热处理工艺对筛网用低碳硅－铌双相钢显微组织，力学性能及冷拔性能的影响。结果表明临界区淬火时得到的含５％－８％边界马氏体的盘条与双重淬火时得到的含１４％－２０％纤维状马氏体的盘条具有相同的强度的塑性；     

钢/黄铜双金属管扩散复合的研究

采用扫描电镜组织观察、能谱分析和显微硬度测定等方法，对冷拔-热扩散后的钢／黄铜双金属复合管界面附近的组织、成分和硬度进行了分析，并测定了不同温度扩散退火后的界面结合强度。结果表明，钢／黄铜双金属管通过扩散复合可使界面实现良好的冶金结合。     

铌、钒微合金紧固件钢的研究

探讨了铌、钒复合与单独铌微合金钢用于制造８．８级非调质高强度紧固件的实用性，同时对两种不同微合金化系统在现行钢的生产工艺条件下的物理冶金和力学性能特点及产品制造工艺特点进行了较详细的试验研究。铌、钒微合金钢热轧态显微组织为铁素体一珠光体，而铌微合金钢则为铁素体一贝氏体。两者在热轧状态下有较高的强度（σ＿ｂ＝６６０～６７０ＭＰａ），较好的塑性（δ＿５＝２５％～２６％）。前者的析出强化作用大于后者。铌、钒复合和单独铌微合金钢的冷拔面缩率分别超过１５％和１８％时，即可达到８．８级紧固件强度水平。为达到产品塑性要求，两者均需进行时效处理，最佳时效温度均为４００℃。紧固件试制说明，用两种试验钢制造的螺栓产品均达到了产品质量要求。     

从黄铜熔渣中湿法回收有价金属

Ｓ．Ｍ．Ａｂｄｅｌ Ｂａｓｉｒ和 Ｍａｈａｍｏｕｄ Ａ．Ｒａｂａｈ利用湿法冶金技术研究了从黄铜熔渣中回收有价金属铜、锌、铅，考察了影响金属回收率的主要因素，如化学计量比、温度、时间和体系的ｐＨ值。试验所用黄铜熔渣由埃及开罗技术工业公司ＥＩ－Ｍａａｄｙ提供。黄铜熔渣中金属的总质量分数（按游离金属计）约３３％，金属主要以氧化物形式存在。试验前需对物料进行预处理，用机械振荡机筛分出各种粒级的物料（共１００ ｋｇ），等分试样用洗涤剂清洗油渍，以水漂洗后，自然干燥。浸出剂为化学纯无机酸，氢氧化铵和 ３０％的过…     

金属型铸造铜基石墨合金

石墨粒子用搅拌铸造的方法加入到三种铜基合金中代替管备件中的铅。在初步试验时，三种类型的石墨加入到硅黄铜（Ｃ８７５００）中研究其铸造性能，之后只用一种石墨加入到硅黄铜（Ｃ８７５００），硅青铜（Ｃ８７６００）和黄铜（Ｃ８５８００）中生产管备件。     

H65黄铜厚板旋转压力焊焊接接头的组织和性能分析

对H65 黄铜厚板材旋转压力焊过程中搅拌头旋转速度对焊接质量的影响进行了研究与分析，所选用的旋转速度分别为 600，800，1000 r/min。研究过程中通过光学显微镜（OM）、扫描电镜（SEM）对H65黄铜合金旋转压力接头区域的微观组织进行观察，并检测接头区域的力学性能。结果表明：旋转压力焊工艺能够有效连接H65黄铜大尺寸厚板材，接头区无明显裂纹，但其微观组织中存在少量气孔，且随旋转速度的增加逐渐减少；接头区域的H65黄铜晶粒明显细化，随旋转速度的增加β相占比减少，有效提升了接头区域的塑性；当搅拌头旋转速度为1000 r/min时， H65黄铜连接效果最好，接头的拉伸强度为348 MPa，延伸率为48.4%，断口呈韧性断裂。     

烧结双相不锈钢的相结构的强韧性

研究了粉末烧结双相不锈钢及其时效后的相结构和强韧性。结果表明，在３１６Ｌ粉末中添加４％（ｗｔ）Ｓｉ，用粉末烧结法可以获得奥氏体加１８％（ｖｏｌ）铁素体的双相不锈钢。该双相不锈钢在８００℃时效时，沿奥氏体和铁素体界面析出条状σ相，使双相不锈钢的硬度增加，塑性下降。     

替代HPb59-1的铋黄铜开发及性能

为顺应形势，我公司开发了可用于替代传统铅黄铜HPb59-1的无铅易切削铋黄铜，其w（Pb）〈0．01％，铅浸出量〈0．004mg/L，机械性能及切削性能不低于HPh59-1。加锰后，不但进一步强化了合金的机械性能，而且提高了耐脱锌性。在此基础上，开发了铋黄铜的加工工艺，试制出了热轧材、挤压材及拉拔线材。     

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.