一、前言放热式气氛具有成本低、操作方便、混合比调节较宽、应用范围广等特点。放热式气氛经分子筛加压吸附去除气氛中的CO_2和H_2O后,制得的氮基气氛,能满足碳钢、合金钢、不锈钢、高铬钢的光亮或光洁退火、正火、淬火和回火等工艺要求。目前国内制取放热式气氛的原料气大多采用液化石油气,目前,这种气源不仅供应 I. Introduction Exothermic atmosphere with low cost, easy operation, wide mixing ratio adjustment, wide range of applications and so on. Exothermic Atmosphere The nitrogen-based atmosphere obtained after pressure-activated adsorption of molecular sieve to remove CO 2 and H 2 O in the atmosphere can satisfy the requirements of bright or clean annealing of carbon steel, alloy steel, stainless steel and high-chromium steel, normalizing, quenching and returning Fire and other process requirements. At present, most of the raw materials used to produce the exothermic atmosphere are liquefied petroleum gas. At present, this gas source not only supplies