HRB335带肋钢筋屈服不明显分析与探讨

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。     

HRB400NbNⅢ级带肋钢筋屈服强度异常情况的探讨

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.     

HRB400NbNⅢ级带肋钢筋屈服强度异常情况的探讨

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。     

拉伸速率及时效对HRB400热轧带肋钢筋拉伸性能的影响

对不同规格HRB400热轧带肋钢筋在不同拉伸速率和同一规格不同时效处理条件下的拉伸性能变化规律进行了研究。结果表明:拉伸速率和时效对热轧带肋钢筋抗拉强度无明显影响,而对屈服强度会产生明显影响;综合考虑拉伸速率及时效的影响,为确保用户和监督部门的抽查合格,热轧带肋钢筋出厂检验时钢筋的屈服强度应具有30MPa以上的余量。     

HRB400细晶粒热轧带肋钢筋的时效性能分析

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.     

含铌HRB400E钢筋无屈服强度的原因分析及对策

针对八钢生产的HRB400E(Nb)热轧带肋钢筋的无屈服强度现象,从缺陷钢筋的金相组织、化学成分、力学性能等方面进行分析,并与力学性能正常的钢筋进行了比较。经过分析认为金相组织存在大量贝氏体是造成带肋钢筋性能无屈服强度的主要原因,并提出了改进措施,取得明显效果。     

20MnSi带肋钢筋焊接脆性断裂原因及预防措施

针对20MnSi热轧带肋钢筋焊接异常断裂现象，进行模拟焊接及拉伸试验，通过对钢筋的理化测试及试验结果统计分析发现碳当量偏高、金相组织异常是造成带肋钢筋焊接拉伸脆断的主要原因，并提出控制碳当量上限、控制终轧温度等措施。     

热轧带肋钢筋的矫直工艺研究

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。     

热轧带肋钢筋性能与工艺研究

根据对邯钢热轧带肋钢筋性能长期的统计分析,找出了屈服强度、晶粒度、碳当量等因素之间的定量关系。     

HRB335钢筋屈服现象不明显原因分析

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。     

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

正~~     

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     

Aluminium Production by Province or City in 2014

正~~     

Refined Copper Production by Province or City in 2014

正~~     

Aluminium Production by Province or City in 2014

正~~     

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     

Fabricated Copper Production by Province or City in 2014

正~~     

Refined Copper Production by Province or City in 2014

正~~     

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     

Contributions to Baosteel Technical Research wanted

正Baosteel Technical Research,a quarterly journal,which is issued domestically and abroad,is run and sponsored by Baosteel Group Corporation.Baosteel Technical Research mainly reports the achievements in technological innovation,academic research,new product development and industrial equipment improvement by Baosteel.It will continue to follow up on hot topics and serve the company’s technological development and progress.Its readers include experts in