Alloying Design for High WearResistant Cast HotForging Die Steels

The alloying design of cast hotforging die steels was analyzed. The relationship of the life of cast hotforging dies with the failure patterns was studied. The thermal wear resistance was believed to be the key property for the alloying design of cast hotforging die steels. The alloying design parameters were selected and optimized for the cast hotforging die steel with high wear resistance. The wear resistance of the optimized cast die steel was evaluated in comparison with commercial H13 steels and 3Cr2W8V steel. In the new cast hotforging die steel, VC is predominant carbide with Cr and Mo as the main solution elements in αFe. It is found that the cast die steel has significantly lower wear rate than normal H13 steel and 3Cr2W8V steel, almost the same as that of high purity H13 steel. The high wear resistance of the new cast hotforging die steel can be attributed to its reasonable alloying design and nonsensibility to the detrimental function of S and P.     

Research on Optimum Operation and Structure of Tundish

10 0 %ＣＣｒａｔｉｏｗａｓｉｍｐｌｅｍｅｎｔｅｄａｔＸｉａｎｇｔａｎＩｒｏｎａｎｄＳｔｅｅｌＣｏＬｔｄｉｎＪｕｌｙ 1999,ｗｈｉｃｈｈａｓ 2ｂａ ｓｉｃｏｘｙｇｅｎｆｕｒｎａｃｅｓａｎｄ 3ｃｏｎｔｉｎｕｏｕｓｃａｓｔｉｎｇｍａ ｃｈｉｎｅｓ,ａｎｄｃａｎｐｒｏｄｕｃｅ 1 5ｍｉｌｌｉｏｎｔｏｎｏｆｓｔｅｅｌａｙｅａｒ.Ｓｉｎｃｅｔｈｅｎ ,ａｌｏｔｏｆｓｔｕｄｉｅｓｈａｖｅｂｅｅｎｃａｒｒｉｅｄｏｕｔｆｏｒｉｍｐｒｏｖｉｎｇ ｑｕａｌｉｔｙｏｆｓｔｅｅｌｓ ,ｉｎ ｐａｒｔｉｃｕｌａｒｇｒａｄｅ 2 0ｃａｒｂｏ…     

大型泵站管理的现状分析及改善对策

为提高大型泵站的管理效率,对大型泵站管理的现状及改善对策进行研究,实现大型泵站水资源价值的最大化。通过对大型泵站管理现状及存在的问题进行分析,认为目前大型泵站在管理中,存在着管理水平不高、市场管理体系不完善、政策和体制不完善等问题,提出要对泵站进行信息化改造、提高管理水平、建立科学合理的水价制度等应对措施。     

Mathematical Model of Combustion in Blunt Annular Ceramic Burner

Symbol L ist　　A—— oxidant flow;　　c1 ,c2 —— constant of the k- ε urbulent model;　　 cg1 ,cg2 —— constant of the turbulent combustion model;　　f—— mixture fraction;　　 f,- f—— value of mixture fraction;　　 fu— fuel;　　F—— fuel flow;　　g—— concentration fluctuation;　　 H—— enthalpy,J;　　k—— kinertic energy for turbulent,m2 / s2 ;　　ma—— mass fraction of material a;　　 ox—— oxidant;　　 r,θ,z—— coordinate axis for cylinder coordinatesystem;　　 s—— equ…     

正交各向异性矩形薄板弯曲问题解析解的一般格式

本文提出了正交各向异性矩形薄板弯曲问题解析解的一般格式。应用一般格式(即文中的(8),(9),(10)式),可求解各种边界条件下,承受横向分布力q(x,y)、集中力P、在板的周边上承受法向弯矩以及承受横向力和板边法向弯矩等组合荷载共同作用下的正交各向异性矩形薄板的弯曲问题。这就使正交各向异性矩形薄板弯曲问题解析解规律化。     

3D FE Analysis of Thermal Behavior of Billet in Rod and Wire Hot Continuous Rolling Process

 An FE model was developed to study thermal behavior during the rod and wire hot continuous rolling process. The FE code MSCMarc was used in the simulation using implicit static arithmetic. The whole rolling process of 30 passes was separated and simulated with several continuous 3D elastic plastic FE models. A rigid pushing body and a data transfer technique were introduced into this model. The on line experiments were conducted on 304 stainless steel and GCr15 steel hot continuous rolling process to prove the results of simulation by implicit static FEM. The results show that the temperature results of finite element simulations are in good agreement with experiments, which indicate that the FE model developed in this study is effective and efficient.