Stainless steel with heat resistant properties

Heat-resisting performance heat-resistant performance refers to the high temperature stainless steel belt is still able to maintain its excellent physical and mechanical properties. Carbon: the influence of carbon in austenite stainless steel belt is formed strong and steady. Set the austenitic austenitic area and expand elements. Carbon formation of austenite is about 30 times that of the nickel, the ability of carbon is a kind of gap elements, through the solid solution strengthening can significantly increase the strength of the austenitic stainless steel belt. Carbon and austenitic stainless steel can be improved with high concentration chloride ( Such as 42% MgCl2 boiling solution) The performance of the resistance to stress corrosion. But, in austenitic stainless steel belt, the carbon is often seen as the harmful elements, this is mainly due to the corrosion of the stainless steel belt use some of the conditions ( Such as welding or the 450 ~ 850 ℃ heating) , carbon steel with chromium in the form of the high chromium Cr23C6 type carbon compounds which can lead to local chromium depletion, make steel corrosion resistance especially resistant to intergranular corrosion performance degradation. So. Since the 60 s the development of new cr-ni austenitic stainless steel belt are mostly carbon content less than 0. 03% or 0. 02% of the ultra-low carbon type, can know as the carbon content is reduced, the steel intergranular corrosion sensitivity is reduced, when the carbon content is less than 0. 02% is one of the most obvious effect, some experiments also pointed out that carbon will also increase the chromium austenitic stainless steel with corrosion tendency. Due to the harmful effect of carbon, not only in the process of smelting austenitic stainless steel belt should be controlled according to the requirement as far as possible low carbon content, and later in the hot, cold and heat treatment process and to prevent the stainless steel surface carburization, avoid chromium carbide precipitation.