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35号、40号、45号、50号等牌号的中碳钢,要求R_c40~45的回火处理,按理论要在350~400℃回火较长的时间。为了提高生产效率,满足大量生产的要求,我们采用了一种快速回火法。这种方法就是将淬火后的工件表面涂一层豆油(其他燃点比较高的油也行),放入600~700℃的箱式电炉中,不久油就燃烧起来;当它烧完,不见火焰,而且在整个工件表面上看不见油的湿润状,不冒烟子,呈一种干黑色时,就可以把
35, 40, 45, 50 and other brands of medium carbon steel, requiring R_c40 ~ 45 tempering, according to the theory to be tempered at 350 ~ 400 ℃ longer time. In order to improve production efficiency, to meet the requirements of mass production, we adopted a rapid tempering method. This method is to quench the workpiece surface coated with a layer of soybean oil (other higher ignition oil is also OK), placed 600 ~ 700 ℃ in a box-type electric furnace, and soon the oil will burn up; when it burns out, no flame , But also in the entire surface of the workpiece can not see the wet oil, do not smoke, was a dry black, you can put