高强度非调质冷镦钢研究和开发现状

Present Status of Research and Development of High Strength Non-Quenched and Tempered Cold Heading Steels

根据国内外高强度非调质冷镦钢的研究和开发现状,分析和讨论了800～1 200 MPa高强度非调质冷镦钢的化学成分、工艺特点、组织和力学性能。高强度非调质冷镦钢应具有高的强度和有良好的冷成形性,其热轧材的强度和硬度应控制在一个合适的范围内。采用低碳高锰及微合金化的成分系列,通过热机轧制工艺,该钢种能获得良好的组织和力学性能。

According to the present status of research and development of high strength non-quenched and tempered cold heading steel at home and abroad, the chemical composition, characteristics of process, structure and mechanical properties of 800 - 1 200 MPa high strength non-quenched and tempered cold heading steels are analyzed and discussed. The high strength non-quenched and tempered cold heading steel should has high strength and excellent cold-forming property, of which the strength and hardness of hot rolled products should be controlled in a suitable range. The steel grade can get better structure and mechanical properties by using low carbon high manganese and micro-alloying steel series with thermal-mechanical control rolling process.