The Effect of Residual Elements on the Structure and Hardness of 20CrMoA
This article compares and analyzes the relationship between the chemical composition,smelting process,rolling process,and finished product structure and properties of 20CrMoA.It is found that the excessive hardness of 20CrMoA is related to the residual B and N content in the chemical composition.When the residual B content exceeds 2 × 10-6 and N below at 50 × 10-6,a large amount of Bainite structure will appear in the 20CrMoA finished product,causing the hardness to exceed the standard.At this time,the residual B content will also have a certain impact on the hardenability of the steel.The smelting process controls the residual B content in the added alloy to in the finished product within 2 × 10-6,when the content of B in steel water is greater than 2 × 10-6,control the N content to through the RH blowing N process 50 × 10-6,the content of Bainite in the finished metallographic structure is less,the hardness can be controlled between 160-190 HBW,and the hardenability stability of the steel is improved.
万方数据
维普
