5CrNiMo或5CrMnMo热锻模具,在淬火加热时产生的脱碳层厚度,可在回火后于检查硬度时一并进行检查。检查硬度时,应首先磨去脱碳层,即用手提式电动砂轮机(一般转速2800转/分,砂轮厚度20毫米),在40×25毫米左右范围内均匀磨削。由于该类钢的含碳量是0.50～0.60％,按钢的火花鉴别法,火花爆裂应为较多量的 5CrNiMo or 5CrMnMo hot forging die, the thickness of the decarburized layer produced during quenching can be checked together with the hardness after tempering. Check the hardness, you should first remove the decarburization layer, that is portable electric grinder (general speed 2800 r / min, grinding wheel thickness 20 mm), uniform grinding in the range of 40 × 25 mm. Due to the carbon content of this type of steel is 0.50 ~ 0.60%, according to the steel spark identification method, the spark burst should be a larger amount