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用密封箱式炉进行短时渗氮 ,只通入氨气和氮气 ,炉气中无任何含碳气体 ,可以彻底消除HCN对环境的污染。经 560℃× 3h短时渗氮后 ,在钢的表面形成大约 ( 1 2~ 2 5) μm的化合物层。 2 0Cr钢、2 0CrMnTi、45钢和SCM 41 5钢短时渗氮后的表面硬度及渗层硬度分布都和同一设备中气体氮碳共渗的结果相同 ,除了低碳钢之外 ,用短时渗氮替代氮碳共渗是值得推广的。
Short-time nitriding with a sealed box furnace only leads to ammonia and nitrogen without any carbon-containing gas in the furnace gas, which can completely eliminate the environmental pollution caused by HCN. After a short period of nitriding at 560 ° C for 3 hours, a compound layer of about (1 2 ~ 2 5) μm was formed on the surface of the steel. Surface hardness and layer hardness distribution of 20Cr steel, 20CrMnTi, 45 steel and SCM 41 5 steel after short-time nitriding are the same as those of the gas nitrocarburizing in the same equipment. In addition to mild steel, When nitriding nitrocarburizing alternative is worth promoting.