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一、概况 七十年代初期发生的国际能源危机,使得以天然气、丙烷为主要原料的控制气氛热处理受到威胁。而另一种以氮为基并佐以一定量的添加剂(二氧化碳、空气、烷类、醇类、烯类等)的控制气氛却应运而生。这种气氛用于热处理具有如下特点: 1. 资源丰富。氮气是空气中“取之不尽”的资源,随着炼钢技术的发展,用氧量不断增加,同时也生产了大量的氮气副产品,为氮基气氛的应用,提供了条件。 2.适应性广。几乎所有的钢铁热处理工艺,如退火、淬火、渗碳、碳氮共渗等都可
I. Overview The international energy crisis that took place in the early 1970s threatened the control atmosphere heat treatment with natural gas and propane as main raw materials. However, another controlled atmosphere based on nitrogen with a certain amount of additives (carbon dioxide, air, alkanes, alcohols, alkenes, etc.) came into being. This atmosphere for heat treatment has the following characteristics: 1. Rich in resources. Nitrogen is the “inexhaustible” resource in the air. With the development of steel making technology, the amount of oxygen used is constantly increasing and a large amount of nitrogen by-product is also produced, which provides the conditions for the application of nitrogen-based atmosphere. Wide adaptability Almost all of the steel heat treatment processes, such as annealing, quenching, carburizing, carbonitriding, etc. can be