Q460钢级高强结构管产品开发

Development of Q460 Grade High Strength Structural Tube Products

根据标准采用碳锰钢加入微量细化晶粒元素,用淬火加回火热处理方式进行生产。批量化生产结果表明,力学性能可以满足要求,并且有很好的韧性表现。在淬火加回火热处理后钢管的屈服强度不小于500 MPa,抗拉强度不小于620 MPa,纵向伸长率不小于20%,-20℃下的平均纵向冲击值不小于180 J,性能满足客户要求;控制碳当量小于0.44,保证后续焊接性能。

The trace amount of refining grain elements are added into carbon manganese steel as well as the heat treatment method of quenching and tempering is applied in production based on the standard.The mass production results showed that the mechanical properties could meet requirements and toughness was good.After the heat treatment of quenching and tempering,the yield strength of steel tube is not less than 500 MPa,tensile strength is not less than 620 MPa,longitudinal elongation is not less than 20%,average longitudinal impact value at-20℃is not less than 180 J and the performances could meet customer's requirements;carbon equivalent is controlled below 0.44 to ensure the subsequent weldability.