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本针对HRB335带肋钢筋的屈服不明显的现象,从金属的微观组织、人工时效、自然时效、测试方法等方面着手,寻求各因素对钢筋力学性能的影响,并阐述了该异常组织的形成机理及相关因素,指出魏氏体、马氏体、粒状贝氏体的存在是造成HRB335带肋钢筋性能异常的主要原因,同时对部分屈服不明显的带肋钢筋判定提供较为科学的依据。 相似文献
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本文针对HRB400NbNⅢ级带肋钢筋屈服强度不明显的现象,从金属的微观组织方面入手,寻找其异常组织结构对屈服强度的影响,并阐述了该异常的组织的形成机理及相关因素,指出贝氏体的存在是造成HRB400NbNⅢ级带肋钢筋屈服强度异常的主要原因及相应改进措施. 相似文献
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本文针对HRB400NbNⅢ级带肋钢筋屈服强度不明显的现象,从金属的微观组织方面入手,寻找其异常组织结构对屈服强度的影响,并阐述了该异常组织的形成机理及相关因素,指出贝氏体的存在造成HRB400NbNⅢ级带肋钢筋屈服强度异常的主要原因及相应改进措施。 相似文献
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通过对昆钢试验生产的HRB400细晶粒热轧带肋钢筋的自然时效和人工时效性能试验分析,得出昆钢生产的HRB400细晶粒钢筋时效后力学性能呈一定的规律性变化,主要表现为钢筋时效后屈服强度有一定下降,抗拉强度的变化不明显,伸长率平均升高了3个百分点,时效不影响钢筋的使用,并且自然时效后,钢筋的综合性能得到了提高. 相似文献
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热轧带肋钢筋的矫直工艺研究 总被引:1,自引:1,他引:0
提出了一种新的热轧带肋钢筋的矫直方式,使得矫直后的钢筋表面无划伤,强度与塑性均有提高,消除了矫直后的钢筋屈服点不明显现象。并对经过不同矫直工艺后的热轧带肋钢筋的金相组织分布、力学性能进行了研究。 相似文献
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用化学分析、力学性能测试、热处理、金相检验等手段探讨了直径为Ф10mm、牌号为HRB335的钢筋混凝土用热轧带肋钢筋屈服现象不明显的原因。 相似文献
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<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 相似文献
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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, 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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, 相似文献
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《China Nonferrous Metals Monthly》2014,(12)
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. 相似文献
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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. 相似文献
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正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully. 相似文献