一、20MnSi螺纹钢组织形态 20MnSi螺纹钢系热轧状态供货,热轧状态使用的建筑钢材。20MnSi螺纹钢的正常热轧组织为铁素体+珠光体(见图1)。众所周知,提高冷却速度与增加过冷奥氏体的上述异常组织,造成屈服点消失,甚至脆断。因此,为解决因组织不正常而引起机械性能恶化的问题,必须从冷却速度的大小和过冷奥氏体稳定性如何两方面去分析研究。我们用我厂5吨电炉冶炼的20MnSi(化学成分见表1)经表2的工艺热处理后,使钢的组织形态发生了不同程度的变化(图2)。研究结果表明,加热温度提高 First, the 20MnSi rebar organization 20MnSi rebar hot-rolled state of the supply, the use of hot-rolled construction steel. The normal hot-rolled microstructure of 20MnSi rebar is ferrite + pearlite (see Figure 1). It is well known that increasing the cooling rate and increasing the above abnormal structure of supercooled austenite cause the yield point to disappear or even brittle fracture. Therefore, in order to solve the problem of the deterioration of the mechanical properties caused by abnormal organization, it is necessary to analyze and study the magnitude of the cooling rate and the stability of the undercooled austenite. We use 5 tons of electric furnace smelting 20MnSi (chemical composition shown in Table 1) by Table 2 of the heat treatment process, the steel morphology changes occurred in varying degrees (Figure 2). The results show that the heating temperature increases