一前言为了设计一种可焊接高强度钢,满足船舶、桥梁、水电站等各方面要求(σ_?_40公斤/毫米~2),并结合我国资源、经济、生产工艺简单,我们选择了在Mn钢基础上加少量钛的方法。许多研究表明,在低碳低合金钢中,加少量钛不仅能够提高钢的强度,而且还是很好的脱氧剂,能够改善钢的可焊性,使晶粒细化和降低时效敏感性。关于钛对脆性的影响,有人认为,钛会提高钢的冷脆性,也有人认为,钛能减少钢的冷脆倾向,其说法不一。近年来,苏联、匈牙利等国家研究成功的Mn-Al-Ti钢具有比较高的屈服强度,同时还有良好的低温韧性。试验钢种是在300吨碱性平炉中冶炼的,钢锭经开坯后轧成不同厚度钢板。检验了热轧状态的机械性能。钢板最后在辊底式炉中进行正火处理。热处理后的钢板做了抗 A preface In order to design a kind of weldable high-strength steel to meet the requirements of ships, bridges, hydropower stations and other aspects (σ_? _ 40 kg / mm ~ 2), combined with China’s resources, economy and production process is simple, Based on the method of adding a small amount of titanium. Many studies have shown that adding a small amount of titanium to low carbon and low alloy steels not only increases the strength of the steel, but also is a good deoxidizer that improves the weldability of the steel, refine the grains and reduce the susceptibility to aging. On the impact of titanium on the brittleness, some people think that titanium will increase the cold brittleness of steel, some people think that titanium can reduce the tendency of cold-brittle steel, its different opinions. In recent years, the successful research of Mn-Al-Ti steels in the Soviet Union, Hungary and other countries has relatively high yield strength and good low-temperature toughness. The test steel is smelted in a 300-ton alkaline open hearth furnace. The steel ingot is rolled into different thickness steel plates after being billet-rolled. The mechanical properties of the hot-rolled state were examined. The plate is finally normalized in a roller hearth furnace. After heat treatment of the steel made a resistance