发明名称 |
METHOD FOR THE MANUFACTURE OF ALLOY RAILWAY RAILS |
摘要 |
An improved method for the manufacture of hardened railroad rails comprises the steps of forming a railroad rail from an alloy steel of a preselected chemical composition, force cooling the rail from a preselected cooling start temperature above about the austenite-to-ferrite transformation temperature, terminating the force cooling when the temperature of rail reaches a preselected cooling stop temperature, and before a substantial volume fraction of the austenite in the rail head has transformed to pearlite, and holding the rail under substantially isothermal conditions until the austenite-to-pearlite transformation is complete. The chemical composition of the alloy steel is selected such that the austenite-to-pearlite reaction occurs earlier in time than the austenite-to-bainite reaction under the substantially isothermal conditions. The use of this method makes avoidance of bainite easier to achieve, so relatively simple and inexpensive process control equipment can be utilized. |
申请公布号 |
CA1308999(C) |
申请公布日期 |
1992.10.20 |
申请号 |
CA19890608244 |
申请日期 |
1989.08.14 |
申请人 |
ALGOMA STEEL CORPORATION, LIMITED (THE) |
发明人 |
ACKERT, ROBERT J.;NOTT, MURRAY A. |
分类号 |
C21D1/00;C21D1/20;C21D9/04;C22C38/18 |
主分类号 |
C21D1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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