MA Li-feng
,
HUANG Qing-xue
,
HUANG Zhi-quan
,
CHU Zhi-bing
,
TIAN Ya-qin
钢铁研究学报(英文版)
The purpose aims to improve the plate shearing section quality and metal yield by means of optimal blade clearance adjustment model of rolling-cut shear and accurate calculation of the maximum shearing force, as well as for the system optimization design, structure optimization design to provide important basis. A 3500 mm rolling shear of a large stainless steel factory was taken as the test object, and the blade clearance under different influence factors of the clearance value and the shearing section were tested. The optimized production accumulated data regression analysis and the rolling shear process of stainless steel shear test. The test results show that the optimal blade clearance adjustment module is a comprehensive function, which include steel plate thickness, material, temperature and shear plate volume. The shear stress at starting stage with the relative penetration depth increases affected by the above factors, and the fracture peak decreases rapidly after being cut into the roll phase constant.
关键词:
stainless steel
,
rolling-cut shear
,
blade clearance
,
shearing force
,
industrial test
WANG Kai
,
XU Tingdong
,
SHAO Chong
,
YANG Chun
钢铁研究学报(英文版)
The data obtained by bending tests for intergranular embrittlement after 45 h and 450 h exposure to Strauss solution have been reported for 304 stainless steel. The results show that an embrittlement peak appears at 650 ℃ for all samples quenched from 1260 ℃ and then sensitized for 150 h at 480, 565, 650, 730, 815 and 900 ℃ respectively. The temperature corresponding to the embrittlement peak is decreased to 565 ℃ when the sensitizing time is prolonged to 1500 h. In this paper, these data are analyzed with an isothermal kinetic model of nonequilibrium grain boundary segregation, indicating that the embrittlement peak is related to the critical time for nonequilibrium grain boundary segregation of sulfur.
关键词:
stainless steel
,
intergranular corrosion
,
nonequilibrium segregation
,
grain boundary
,
sulfur
梁军
,
张海兵
,
刘广义
,
闫永贵
材料开发与应用
采用失重分析和电偶腐蚀测试等方法研究了气田立管采用的316L/625复合管材料在海水中的腐蚀情况,结果表明,复合管316L不锈钢和625合金在10℃海水中浸泡3个月后,平均腐蚀速率均低于0.01 mm/a,而焊接接头处的腐蚀速率较大,为0.015 mm/a,电偶腐蚀对316L不锈钢的影响不大,电偶腐蚀系数不超过130％.
关键词:
不锈钢
,
复合管
,
海水
,
腐蚀
高亚男，谢红飙，肖宏，王健
钢铁
研究了不锈钢/碳钢包层钢筋轧制过程中，轧件尺寸变化情况以及金属的流动规律。应用MSC.Marc对不锈钢/碳钢包层钢筋轧制过程进行了有限元模拟。基于软件二次开发，判断两金属的结合状态。通过和均质碳钢钢筋轧制模拟结果进行对比，并经包层钢筋轧制试验验证，结果表明：轧制过程中，不锈钢包层钢筋芯部的轴向延伸阻力大于均质碳钢钢筋，造成包层钢筋的宽展大于均质碳钢钢筋，因此，不能应用轧制均质碳钢钢筋的孔型轧制包层钢筋。包层钢筋的模拟结果与试验比较吻合，证明孔设计合理且有限元模型可靠。
关键词:
不锈钢
,
cladding rod
,
rolling
,
groove
吴庭翱
,
查小琴
材料开发与应用
本文采用金相显微镜(OM)、扫描电镜(SEM)以及透射电镜(TEM)对不锈钢焊接件、不锈钢铸件晶间腐蚀试样弯曲裂纹进行分析,并与电化学动电位再活化法(EPR)试验结果进行对比,研究出晶间腐蚀所致弯曲裂纹不同于因机械破坏所致弯曲裂纹微观特征,进而总结出区分二者的方法,并结合GB 4334方法E《不锈钢硫酸-硫酸铜晶间腐蚀试验方法》,对完善不锈钢焊接件和不锈钢铸件的晶间腐蚀结果评定方法进行了改善.
关键词:
不锈钢
,
晶间腐蚀
,
结果评定
,
EPR法
米丰毅
,
龚雪辉
,
袁武华
,
梁剑雄
,
王长军
材料开发与应用
在Gleeble-3800热模拟试验机上对Nitronic60奥氏体不锈钢进行高温等温压缩实验,研究该材料在变形温度为950-1 200℃、应变速率为0.01-10 s-1、真应变量0.9等条件下的热变形行为,并观察了变形后的显微组织.研究结果表明:在热压缩过程中,流变应力随变形温度的升高而降低,随应变速率的升高而增加;当变形速率较低时,材料在变形温度范围内均发生了动态再结晶.采用双曲正弦模型建立了相应的热变形本构关系,其热变形激活能为425.542 kJ/mol,高温压缩变形时,Z参数和流变应力方程分别为Z=(ε)exp(425.542/RT)=3.495×1015[sinh(0.005 93σ-) 5.55,(ε)=3.495×1015[sinh(0.005 93σ)]5.55exp[-525.524/(RT)].
关键词:
奥氏体
,
不锈钢
,
热模拟
,
压缩变形
,
本构方程
艾立翔
,
，汪红兵，徐安军
,
，田乃媛
,
，贺东风
钢铁
以往的AOD炉高效化冶炼研究往往通过提高供氧强度，优化转炉的炉容比，提高终点命中率等技术缩短冶炼周期,需要充分利用现有的设备，优化炉料结构和供氧制度，对生产工艺参数进行优化，充分利用这些物理热和化学热，实现AOD炉的高效化冶炼。开发了AOD炉高效化冶炼模型，在AOD炉物料平衡和能量平衡的基础上，结合AOD炉冶炼的工艺特征，建立AOD炉耗氧量和冶炼周期模型，分析了AOD炉冶炼周期随着铁水比和废钢比的变化趋势，得出冶炼周期最短时的炉料结构。结果表明：电炉不锈钢母液加铁水冶炼时，冶炼周期随着铁水比的增加而增加。电炉不锈钢母液加废钢冶炼时，冶炼周期随着废钢比的增加而增加。铁水加废钢冶炼时，冶炼周期随着废钢比的增加而延长。以硅铁为发热剂比以碳粉为发热剂冶炼周期短。
关键词:
不锈钢
,
AOD
,
tap to tap time
