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叙述了石油油井用，枪管，４２ＣｒＭｏ的化学成分和技术条件，确定了“枪管”的挤压工艺制度，其性能和尺寸公差均可达到石油测井的需要。
Describes the chemical composition and technical conditions of 42CrMo for oil and gas well, barrel and 42CrMo, and determines the extrusion process system of “barrel”. Its performance and dimensional tolerance all meet the need of oil well logging.