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为了提高A333Gr.3低温用无缝钢管的冲击韧性,对三种低温用无缝钢管进行了化学成分、有害元素、气体含量、轧态力学性能、热处理后的金相组织和力学性能分析对比.碳含量对钢管低温冲击韧性有明显的影响,碳含量越低,冲击韧性越高.钢中磷含量可显著提高钢的脆性转变温度,应进一步降低钢中磷含量,同时控制钢管轧制温度,降低钢管终轧温度,提高钢管冷却速度,细化晶粒度,这些措施都有助于提高无缝钢管低温冲击韧性.
In order to improve the impact toughness of A333Gr.3 low temperature seamless steel pipe, chemical composition, harmful elements, gas content, rolling mechanical properties, microstructure and mechanical properties after heat treatment of three kinds of low temperature seamless steel tubes were analyzed. Carbon content has a significant impact on the low temperature impact toughness of steel pipe, the lower the carbon content, the higher the impact toughness.The phosphorus content in steel can significantly increase the brittle transition temperature of steel, should further reduce the phosphorus content in steel while controlling the rolling temperature, Reducing the finishing temperature of the steel pipe, increasing the cooling speed of the steel pipe and refining the grain size can all help to improve the low temperature impact toughness of the seamless steel pipe.