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In this paper, the German company's E911 Vallourec Mannesmann steel heat treatment is preferably carried out , that the best of the heat treatment process : 1040 ℃ 790 ℃ normalizing and tempering . On this basis , for the heat treatment process by the new and the old of heat treatment process of the mechanical properties of steel samples , serial impact , high-temperature creep strength , oxidation and other performance comparison test , using optical microscopy, transmission electron microscopy, scanning electron microscopy were microstructure and fracture was observed. The experimental data were in-depth analysis, test results showed that: the steel through new technology 650 ℃ 3000h its normal temperature after aging properties and high temperature performance than by the old process handling has improved significantly . If impact toughness increased by 1.5 times , FATT lower 20 ℃, 650 ℃ E911 steel pipe according to the level of oxidation level GB/T13303-91 , the completely oxidized. The article also on E911 steel timber at room temperature and high temperature aging stepmother and high-temperature creep strength of welded joints were studied . The results showed that , E911 steel can replace TP304H, TP321H and TP347H stainless steel , dissimilar steel welding solve problems , and reduce the manufacturing cost of the boiler .
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