回火工艺对1Cr17Ni2不锈钢锻后回火硬度的影响

采用正交试验等研究了回火温度、回火时间、回火次数及冷却方式对1Cr17Ni2不锈钢锻后回火硬度的影响。结果表明,本试验中在回火温度630~730 ℃,回火时间120~360 min,回火1~3次以及冷却方式分别为空冷、堆冷、砂冷的条件下,对1Cr17Ni2钢锻后回火硬度影响因素的主次排序为:回火次数＞回火温度＞回火时间＞冷却方式,其中随着回火次数增加,硬度逐步下降,其余参数在试验参数范围内与硬度无明显正相关关系。在保温时间为240 min时,将回火温度升高至720 ℃,或在680 ℃下,将保温时间延长至720 min,进行一次回火,回火后空冷,硬度均高于3.5 HBS。在加热温度为680 ℃、回火时间为180~210 min,回火后空冷,回火3次可将硬度降低至3.6 HBS以下。

Effect of tempering on hardness of forged 1Cr17Ni2 stainless steel

The effect of tempering temperature,tempering time,tempering times and cooling mode on the tempering hardness of forged 1Cr17Ni2 stainless steel was studied by orthogonal test. The results show that when the tempering temperature range is 630-730 ℃,the tempering time range is 120-360 min,the number of tempering times is 1-3,and the cooling methods are air cooling,stack cooling and sand cooling respectively,the influence order on the hardness of the steel is times of tempering > tempering temperature > tempering time > cooling mode,and the tempering hardness of the steel decreases gradually with the increase of tempering times,though other parameters have no positive correlation with the hardness. When tempered one time at 720 ℃ for 240 min,or at 680 ℃ for 720 min,followed by air cooling,the tempering hardness of the steel is always higher than 3. 5 HBS. When tempered for three times and all at 680 ℃ for 180-210 min then air cooled,the hardness of the steel can decrease to 3. 6 HBS or lower.