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高铬铸钢由于其氧化不起皮特性和比高铬镍钢便宜的价格,被广泛用于工作温度为850～1000℃的窑炉,作耐热构件。该钢含Cr17～25％,组织为铁素体加富铬的碳化物。在推荐温度下使用,其抗氧化性良好,但韧性低,使其在铸造、清理、搬运及使用中容易脆裂,导致失效。一、高铬钢致脆的原因高铬钢铸态组织晶粒粗大,碳化物枝晶倾向严重,呈链网状分布,而单个碳化物为较大的块状与条状,随铬量提高,碳化物析出增多,沿晶界链网趋势加剧。
High-chromium cast steel is widely used in kilns operating at 850 to 1000 ° C for heat-resistant components due to its oxidation-resistant skin properties and its cheaper price than high-chromium-nickel-steel. The steel containing Cr17 ~ 25%, organized ferritic chromium-rich carbide. The use of the recommended temperature, good oxidation resistance, but low toughness, making it easy in casting, cleaning, handling and use of brittle fracture, resulting in failure. First, the causes of high chromium steel caused by brittle High-chromium steel as-cast coarse grains, carbide dendrites tend to be serious, showing a chain network distribution, and a single carbide larger block and strip, with the chromium increased , Carbide precipitation increased, the trend along the grain boundary chain network intensified.