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铁素体型的高铭不锈耐酸钢,在某些介质中有良好的耐腐蚀性,铁素体型高铬含硅的不起皮钢,在高温下有良好的耐氧化性。但是它们的主要缺点之一是,在室温和低温下较脆,因而给钢的冷加工(如冷拔、冷轧)带来了不少困难。许多文献曾总结了铁素体高铬钢脆性的因素:475—520℃的脆性;出现σ——相所引起的脆性;因晶粒长大而产生的脆性等。它们均可采用某些方法来加以避免或消除。如475℃脆性和由于σ——相析出而产生的脆性可采用加燃至810℃或850℃,然后快冷的方法加以消除;晶粒长大的脆性可用控制热加工温度的方法加以避免。然而铁素体高铬钢的“本质脆”(非由上述因素所造成
Ferrite-type high-Ming stainless steel, in some media have good corrosion resistance, ferritic high-chromium silicon can not afford leather, good oxidation resistance at high temperatures. However, one of their major disadvantages is the brittleness at room and low temperatures, which creates difficulties for cold working of steel, such as cold drawing and cold rolling. Many literatures have summarized the brittleness of ferritic high-chromium steel: brittleness of 475-520 ℃, brittleness of σ-phase, brittleness due to grain growth and so on. They all can be avoided or eliminated in some ways. For example, brittleness of 475 ° C and precipitation due to σ-phase can be eliminated by burning to 810 ° C or 850 ° C and then rapid cooling. The friability of grain growth can be avoided by controlling the hot working temperature. However, the “brittleness” of ferritic high-chromium steels (not caused by the above factors