二次调质后，堆芯段筒体锻件产生了椭圆变形，为了不影响锻件已有性能，采用冷校形加去应力回火方法进行校正。
In order to keep the property of forging pieces which they already have, calibrating in the way of cold correcting the shape with stress release and tempering could get a better result.
研究了淬火、回火工艺对低碳马氏体型高强度高韧性非调质钢的组织和性能的影响。
The effect of hardening and tempering process on the organization and performance of high-strength and high-toughness non-hardened-and tempered steel of low carbon martensite is researched.
热处理1949年前，北京已采用电炉、盐溶炉、热电偶等手段进行零件退火、回火、淬火、正火、调质、渗碳等热处理。
Before 1949, Beijing has heat treatment furnace, salt dissolved by thermocouples means furnace, quenching and tempering, parts of annealing, normalizing, quenching and tempering, carburizing and etc.
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