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象前几次美国金属学会(ASM)热处理年会一样,有关炉子气氛的专题吸引了来芝加哥赴会的大量听众。与往常相同,大量文章肯定了用氮基气氛代替发生炉气氛的优点。但是,这次会议出现了一种新的趋向——气体发生炉在成本和经改进的控制基础上正在作出回击。氮基气氛在70年代初,由于美国燃料价格的大幅度增长和天然气供应紧缺的威胁,人们对氮基气氛引起了兴趣,在寻找取代传统的发生炉气氛方面,有人估计美国16％以上的商业热处理者现在在采用氮基气氛系统进行渗碳和碳氮共渗。 20多年前由法国雷诺工厂首先提出的氮/甲醇,已成为需要碳势控制处理用的吸热性气氛代用品的标准氮基气氛,近来已被全世界400多家热处理厂广泛使用。在北美,供
Like the previous annual ASM Heat Treatment Conference, the topic of furnace atmosphere attracted a large audience of Chicago attendants. As usual, a large number of articles confirm the advantage of replacing the furnace atmosphere with a nitrogen-based atmosphere. However, there was a new trend at the conference - gas fired furnaces were making a comeback on the basis of cost and improved controls. NITROGEN BASIS In the early 1970s, interest in nitrogen-based atmospheres was a source of interest due to the substantial increase in fuel prices in the United States and the threat of a shortage of natural gas. Someone looking at replacing conventional furnace atmospheres has been estimated by more than 16% of commercial Heat Processors are now using carbonic acid and carbonitriding in a nitrogen-based atmosphere system. Nitrogen / methanol, first proposed by the Renault plant in France more than 20 years ago, has become the standard nitrogen-based atmosphere for surrogate endothermic atmospheres requiring carbon potential control treatment and has recently been widely used by more than 400 heat treatment plants worldwide. In North America, for