公开(公告)号：US20070181231A1

公开(公告)日：2007-08-09

申请号：US10590846

申请日：2005-03-09

申请人： Masaharu Ueda ,  Kazuo Pujita ,  Koichiro Matsushita ,  Takeshi Yamamoto ,  Takuya Satoh

发明人： Masaharu Ueda ,  Kazuo Pujita ,  Koichiro Matsushita ,  Takeshi Yamamoto ,  Takuya Satoh

IPC分类号： C21D9/04

CPC分类号： C21D9/04 ,  B21B1/085 ,  C21D2211/009 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18 ,  C22C38/24

摘要： Disclosed are methods of producing steel rails having a high carbon content and being excellent in wear resistance and ductility from the slabs for rails. One method involves producing a steel rail having a high content of carbon, comprising finish rolling the rail in two consecutive passes, with a reduction rate per pass of a cross-section of the rail of 2-30%, wherein the conditions of the finish rolling satisfy the following relationship: S≦800/(C×T), wherein S is the maximum rolling interval time (seconds), C is the carbon content of the steel, wherein the carbon content is 0.85-1.40 mass %, and T is the maximum surface temperature (° C.) of the rail head. Another method involves producing a steel rail with a high content of carbon, comprising: finish rolling the rail in three or more passes, with a reduction rate per pass of a cross-section of the rail of 2-30%, wherein the conditions of the finish rolling satisfy the following relationship: S≦2400/(C×T×P), wherein S is the maximum rolling interval time (seconds), C is the carbon content of the steel rail, wherein the carbon content is 0.85˜1.40 mass %, T is the maximum surface temperature (° C.) of a rail head, and P is the number of passes, which is 3 or more. In addition to above, controlled additional amounts of V, Nb, N may be added to the steel rail and/or controlled rapid cooling of the rail after rolling may be accomplished to provide further improvements.

摘要翻译： 公开了一种生产具有高碳含量并且具有优异的耐磨性和延展性的钢轨的方法。 一种方法包括生产具有高碳含量的钢轨，其中包括以两次连续的道次精轧轧制轨道，轨道横截面的每次通过的减速率为2-30％，其中完成的条件 轧制满足以下关系：S <= 800 /（C×T），其中S是最大轧制间隔时间（秒），C是钢的碳含量，其中碳含量为0.85-1.40质量％，T为 轨头的最大表面温度（°C）。 另一种方法包括生产具有高碳含量的钢轨，其特征在于：以三次或更多道次精轧轧制轨道，轨道横截面的每次通过的减速率为2-30％，其中条件 精轧满足以下关系：S <= 2400 /（CxTxP）其中S是最大轧制间隔时间（秒），C是钢轨的碳含量，其中碳含量为0.85〜1.40质量％ T是轨头的最大表面温度（℃），P是3次以上的通过次数。 除了上述之外，可以在钢轨上加入控制的附加量的V，Nb，N，和/或可以在轧制之后控制轨道的快速冷却，以提供进一步的改进。