试验温度对不同热处理状态核电站用P280GH钢弯头拉伸性能的影响

Effect of Test Temperature on Tensile Properties of P280GH Steel Elbows Used in Nuclear Power Plant with Different Heat Treatment Conditions

对性能热处理(HTMP)状态和性能热处理+模拟消除应力热处理(HTMP+SSRHT)状态核电站用P280GH钢弯头在不同温度(25,50,100,150,200,250,300,316℃)下进行了拉伸试验,研究了温度对不同状态P280GH钢弯头拉伸性能的影响。结果表明:P280GH钢在HTMP状态下的抗拉强度和屈服强度高于HTMP+SSRHT状态下的;P280GH钢弯头在两种状态下,在温度从室温升高到316℃的过程中,抗拉强度先降后增,屈服强度持续降低,在300℃时出现"蓝脆"现象。当服役温度在150~250℃时,材料应在服役温度下进行力学性能测试。

The tensile tests of P280GH steel elbows used in nuclear power plant were carried out at different temperatures(25,50,100,150,200,250,300,316 ℃)under heat treatment for mechanical properties(HTMP)condition,heat treatment for mechanical properties and simulated stress relieving heat treatment(HTMP+SSRHT)condition.The effects of temperatures on the tensile properties of P280GH steel elbows with different heat treatment conditions were studied.The results show that the tensile strength and yield strength of P280GH steel elbows in HTMP state were higher than those in HTMP+SSRHT state.In the two states,when the temperature rose from room temperature to 316℃,the tensile strength of P280GH steel first decreased and then increased,and the yield strength continued to decrease,and the "blue brittleness"phenomenon appeared at 300 ℃.When the service temperature was 150~250℃,the mechanical properties of the material should be tested under the service temperature.