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我厂生产中遇到长645、宽25、厚2毫米的T8钢带要求热处理,温度HRC31～37。开始未用任何涂料保护,吊挂在井式加热炉中加热(淬火温度820℃、保温10分钟)淬入40℃的10号机油中,结果具有工件两边白色区域硬度达HRC60～64,而中间存在大量的黑色区域,硬度仅为HRC31～37,硬度极不均匀。后来我们采用在钢带表面涂(或浸)上肥皂水,再撒上硼砂来保护,效果十分满意,淬火后大部分呈白色。硬度HRC62～65,仅有少数黑色斑点,其硬度也在HRCeO以上。经530℃回火60分钟,达到了要求的硬度。应注意,淬火加热前钢带若有氧化现象,应经喷砂处理。把硼砂加
I encountered in the production plant length 645, width 25, thickness 2 mm T8 steel requires heat treatment, the temperature HRC31 ~ 37. Initially without any paint protection, hanging in a pit furnace heating (quenching temperature 820 ℃, heat 10 minutes) quenched into 40 ° C No. 10 oil, the results with the white area on both sides of the workpiece hardness HRC60 ~ 64, while the middle There are a large number of black areas, the hardness is only HRC31 ~ 37, the hardness is very uneven. Later, we use the surface of the strip coated (or dip) on the soapy water, then sprinkle borax to protect the effect is very satisfied, most of the white after quenching. Hardness HRC62 ~ 65, only a few black spots, its hardness is above HRCeO. After 530 ℃ tempering 60 minutes, reached the required hardness. It should be noted that quenching and heating of the strip if the phenomenon of oxidation should be sandblasting. Add borax