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零件名称:190下曲轴材料:QT60—2老工艺:正火,(硬度 HB250～300)寿命1000～1500小时。新工艺:正火+软氮化(通氨滴醇+空气,化合层深30～35μ,渗表层深0.25～0.35
Part Name: 190 under the crankshaft Material: QT60-2 old technology: normalizing, (hardness HB250 ~ 300) life of 1000 to 1500 hours. New technology: normalizing + nitriding (ammonia ammonia + air, compound layer deep 30 ~ 35μ, seepage surface layer 0.25 ~ 0.35