Chief factor of influence nitriding is temperature, the grain size of material, the component of alloy, gas pressure and purity.
影响增氮的主要因素有：温度、物料的粒度、合金成分、气体压力和纯度。
2
Material purity is the most important factor.
材料的纯度最重要的因素。
3
The high purity of rose essential oil and natural moisturizing factor, combines with the activating essences-coenzyme Q10. Rich bubbles can mildly and thoroughly remove skin dirt.