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本发明是改进的高温用低合金钢。很早以来,高温用钢,特别是锅炉用钢,要求具有良好的高温强度,焊接性能和均质性。一般说来,碳素钢经不起在450℃以上的高温下使用,因此在590℃左右的高温下往往使用1Cr-1/2Mo钢或1 1/4Cr-1/2Mo-3/4Si钢。本发明是具有如下特征的高温用低合金钢:合金元素含量比以前的高温用低合金钢少,因而价格低廉,而且比起以前的钢的蠕变区来温度要低,即大约在500℃以下强度比以前的
The present invention is an improved low alloy steel for high temperature. Very early, high temperature steel, especially boiler steel, requires good high temperature strength, weldability and homogeneity. In general, carbon steel can not withstand the use of high temperatures above 450 ℃, so the high temperature of about 590 ℃ often use 1Cr-1 / 2Mo steel or 1 1 / 4Cr-1 / 2Mo-3 / 4Si steel. The present invention is a low-alloy steel for high temperature use which contains less alloying elements than the conventional low-alloy steel for high temperature and hence is inexpensive and has a lower temperature than the creep region of the prior steel, i.e. about 500C The following intensity than the previous