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1978年五月下旬日本越公司东京支店产业装置科科长柳本武治来京,就该公司专利Hibright炉进行了技术座谈。 Hibright炉的炉型与多用炉(又称密封箱式炉)相似。其主要特点是采用了纯氮作保护气氛。同时为了中和工件带入炉中的少量氧气,在氮气中加入微量的添加剂C_3H_8或C_3—H_7HO通常采用后者,加入量约10CC/小时～50CC/小时。这样添加剂在炉内裂解产生微量的CO和H_2,使炉内气氛成为具有微还原性的“中性气氛”。炉气的成分大致为CO:0.3％～0.7％;H_2:0.8％～1.5％;其余为N_2。这样的气氛就称为“Hibright”气氛,含碳量不同的钢材均可在这样的气氛中实现不增碳,不脱碳、不氧化的光亮热处理。
In late May 1978, the chief engineer of the Industrial Devices Division of the Tokyo Branch of Japan’s Yuexiu Branch Co., Ltd., Ryoo Nam-wu, came to Beijing to hold a technical discussion on the company’s patented Hibright furnace. Hibright furnace furnace and multi-purpose furnace (also known as sealed box furnace) similar. Its main feature is the use of pure nitrogen for the protection of the atmosphere. At the same time in order to neutralize the small amount of oxygen brought into the furnace by the workpiece, the latter is usually added by adding a small amount of additive C_3H_8 or C_3-H_7HO to the nitrogen at a dosage of about 10 cc / hour to 50 cc / hour. In this way, the additive is cracked in the furnace to generate a trace amount of CO and H 2, making the atmosphere in the furnace a “neutral atmosphere” with a micro-reducibility. The composition of the furnace gas is roughly CO: 0.3% ~ 0.7%; H_2: 0.8% ~ 1.5%; the rest is N_2. This atmosphere is called “Hibright” atmosphere, with different carbon content of steel can be achieved in such an atmosphere without carbon, not decarburization, no oxidation of the bright heat treatment.