There are different working cases between two mated parts of jar.If the upper part has been indurated the life of jar would prolong.

• 针对缸套上、下两部分不同的工况条件，增加上部硬化轨迹的密度，使上、下两部分达到等同的耐磨性，大幅度提高了气缸套的耐磨性和使用寿命。