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为改善舰船用907钢的塑性和韧性,本文研究了硅、锰含量对907钢综合性能的影响。结果表明,硅含量从0.95％降低到0.40～0.70％,锰含量从0.65％提高到1.30％,钢的强度性能指标满足σ≥390 MPa的设计要求,而塑性和韧性显著提高,冲击韧性—脆性转变温度降低约50℃,在低温下,能够表征材料抗脆断能力之一的裂纹扩展功显著提高。 通过降Si提Mn调整907钢的化学成分,明显提高了钢的综合性能,为提高我国舰船用907钢的质量提出了一个改进的方向。
In order to improve the plasticity and toughness of 907 steel for ships, this paper studied the effect of silicon and manganese content on the comprehensive properties of 907 steel. The results show that the content of silicon decreases from 0.95% to 0.40% to 0.70% and the content of manganese increases from 0.65% to 1.30%. The strength performance index of steel satisfies the design requirement of σ≥390 MPa, while the ductility and toughness increase remarkably. The transformation temperature is reduced by about 50 ℃. At low temperature, the crack growth work, which can characterize the brittle fracture resistance of the material, increases remarkably. By reducing the Si mention of Mn to adjust the chemical composition of 907 steel, significantly improve the overall performance of steel, to improve the quality of China’s ship 907 steel put forward an improved direction.