预硬型塑料模具钢调质工艺研究

通过端淬试验及调质处理试验室模拟试验对P20和718预硬型塑料模具钢的淬透性及调质工艺了研究和探讨。     

探析P20塑料模具钢生产工艺

文章对传统P20塑料模具钢生产工艺进行改进,通过采用小试样试验对控轧控冷加低温回火工艺进行试验研究,发现采用控轧控冷加低温回火工艺能够提高P20钢的淬透性及硬度,使硬度分布更加均匀。     

塑料模具钢P120预硬处理工艺研究

塑料模具钢P120在模具加工后热处理容易产生变形及开裂,采用新的,合理的淬,回火工艺,可以减少工序,缩短交货期.本文对淬,回火工艺进行了研究与探讨,确定了淬火温度在840℃～860℃时,晶相组织及淬透性最佳;回火温度确定在590℃～610℃时,可保证P120钢硬度在HRC30～60范围内.     

718塑料模具钢锻造模块冶炼工艺研究

718模块试制采用EBT+LF+VD+模铸19、36吨大钢锭+红送锻造中心锻造+退火+探伤+调质+探伤检验+入库生产工艺。大钢锭锻造模块718钢冶炼工艺的研究结果表明:控制好化学成分、气体[H]、[O]及非金属夹杂物含量,可使大钢锭的冶金质量达到较高水平。统计数据表明,试制生产的厚度300/600mm塑料模具钢718模块完全可满足用户要求。     

非调质塑料模具钢热加工的模拟研究

采用Gleeble 3800热模拟试验机研究了非调质塑料模具钢(SWFT钢)的热变形工艺,试验结果表明,SWFT钢分别在1000、1050、1100和1150 ℃单道次变形50%后以0.083 ℃/s的速度冷却时,随热变形温度的升高,先共析铁素体组织减少直至消失,但晶粒较粗大.多道次热变形后在相同冷却速度时确保先共析铁素体组织不出现,同时细化因单道次变形温度较高出现的粗大晶粒,为SWFT钢应用于一定截面尺寸的非调质塑料模具钢模块提供了制订锻造工艺的依据.     

塑料模具钢P120预硬处理工艺研究

塑料模具钢P120在模具加工后热处理容易产生变形及开裂，采用新的合理的淬、回火工艺，可以减少工序，缩短交货期。本文对淬，回火工艺进行了研究与探讨，确定了淬火温度在840℃-860℃时，晶组织及淬透性最佳；回火温度确定在590℃-610℃，可保证P120钢硬度在HRC30－60范围内。     

硼含量及奥氏体化温度对P20B钢淬透性的影响

 为提高P20B钢的淬透性,通过端淬试验研究了硼含量及奥氏体化温度对P20B钢淬透性的影响。结果表明,当硼含量在0000 9%~0002 3%范围时,P20B钢的淬透性得到提高;当硼含量超过0004 0%时,P20B钢的淬透性反而下降。奥氏体化温度在820~920 ℃范围时,随温度升高,P20B钢的淬透性显著提高。     

含钒非调质预硬型塑料模具钢48MnV的开发

通过实验室50 kg中频感应炉冶炼试验研究了（/%）:0.36~0.45C,0.42~0.46Si,1.41~1.49Mn,0.11~0.15V非调质预硬型塑料模具钢C、V含量对该钢硬度的影响。并根据回归分析开发含钒非调质预硬型模具钢48MnV（/%:0.45~0.50C,0.30~0.60Si,1.20~1.40Mn,≤0.020P,≤0.020S,0.15~0.20V）以取代调质P20塑料模具钢（/%:0.35~0.40C,0.40~0.60Si,0.80~1.00Mn,≤0.015P,≤0.015S,1.50~1.80Cr,0.30~0.50Mo）。经110炉120t转炉-360 mm×450 mm连铸坯-≤85 mm扁钢轧制-控制冷却速度0.6~1.0℃/s的在线预硬化处理的生产结果表明,非调质48MnV扁钢HRC硬度值为29.5~33.5,满足相关技术条件要求。     

改良型塑料模具钢切削性能分析

通过对改良型NC718塑料模具钢切削性能的对比分析，阐述了热处理工艺、显微组织、夹杂物等因素对NC718钢切削性能的影响。     

900 MPa级薄规格调质高强钢生产技术研究

基于低锰及Cr-Mo-Ni-B成分体系设计,采取热连轧、横切、离线调质的工艺路线,实现了900 MPa级薄规格调质高强钢的稳定生产.通过光学显微镜、拉伸试验机和冲击试验机对试验钢在不同卷曲温度和热轧、淬火、调质后的组织及性能进行检测,结果显示:试验钢在550℃温度卷曲后调质处理获得的强度比680℃温度卷曲后调质处理获得...     

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.