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发明公开
CN107460301A 一种减轻GCr15轴承钢脱碳层深度的加热方法 无效 - 驳回

一种减轻GCr15轴承钢脱碳层深度的加热方法
摘要：
本发明是一种减轻GCr15轴承钢脱碳层深度的加热方法，钢坯先在保温炉中保温，保温温度为500-600℃，保温时间为30min；然后送入步进梁式加热炉分4段加热，预热段为850-1020℃，加热一段温度为1100-1190℃，加热时间大于35min，加热二段温度为1180-1220℃，均热一段温度为1180-1220℃，均热二段温度为1170-1210℃，加热二段到均热二段的加热时间大于130min；加热过程通入氧气，预热段氧气流量80000-90000m3/h，氧气压力为8-9bar，均热段的氧气流量140000-150000m3/h，氧气压力为14-15bar。本发明的方法有效的缩短了加热时间，减轻了脱碳层深度。
摘要（英）：

The invention discloses a heating method capable of reducing depth of a decarburized layer of GCr15 bearing steel. The heating method comprises the following steps of: preserving the heat of steel billets for 30 minutes at a temperature of 500-600 DEG C in a heat preserving furnace; feeding the steel billets into a step beam type heating furnace to heat in four stages, wherein the temperature at a pre-heating stage is 850-1020 DEG C, a temperature at a heating stage I is 1100-1190 DEG C, heating time of the heating stage I is greater than 35 minutes, a temperature at a heating stage II is 1180-1220 DEG C, a temperature at a uniform-heating stage I is 1180-1220 DEG C, a temperature at a uniform-heating stage II is 1170-1210 DEG C, and heating time from the heating stage II to the uniform-heating stage II is greater than 130 minutes; introducing oxygen gas in a heating process, wherein oxygen gas flow at the pre-heating stage is 80000-90000 m<3>/h, oxygen gas pressure at the pre-heating stage is 8-9 bar, oxygen gas flow at the uniform-heating stage is 140000-150000 m<3>/h, and oxygen gas pressure at the uniform-heating stage is 14-15 bar. The method effectively shortens the heating time, and reduces the depth of the decarburized layer.

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