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通过对4炉经过正火+回火热处理的HCM2S钢管进行拉伸试验,结合微观组织观察和能谱分析,研究了氮和氧含量对HCM2S钢组织和性能的影响.结果表明:当HCM2S钢中氮的质量分数大于71×10-6时会和硼元素反应生成BN夹杂物,从而使钢中“有效硼”量减少,降低钢的淬透性,最终影响组织和性能.氮含量不高于71×10-6时,氧的质量分数在14×10-6～49×10-6内变化不会对HCM2S钢组织和性能造成影响.通过在钢中加入少量Ti元素,即使氮含量较高,Ti也可以和氮发生反应生成氮化钛,从而获得全贝氏体组织和优异的力学性能.
The effect of nitrogen and oxygen content on the microstructure and properties of HCM2S steel was studied by tensile test on 4 normalized and tempered HCM2S steel tubes combined with microstructure observation and energy spectrum analysis.The results showed that when HCM2S steel When the mass fraction of nitrogen is more than 71 × 10-6, it will react with boron to form BN inclusions, so that the amount of “effective boron” in the steel is reduced, the hardenability of the steel is reduced, and finally the structure and properties are affected. Above 71 × 10-6, the mass fraction of oxygen in the range of 14 × 10-6 ~ 49 × 10-6 will not affect the microstructure and properties of HCM2S steel.With the addition of a small amount of Ti in the steel, even the nitrogen content Higher, Ti also reacts with nitrogen to form titanium nitride, resulting in full bainitic structure and excellent mechanical properties.