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在船用主机60/110,50/110-2的生产开发阶段,根据技术条件缸套(重2吨)应以石墨为90～360的珠光体灰铸铁铸造(冲天炉熔炼),其化学成分(％)为C3～3.2,Si0.8～1.1,Mn0.7～0.9,V0.2～0.25,Ti0.05～0.07,P0.1～0.2,S≤0.12。金相组织中不允许存在自由状态的铁素体与渗碳体。铸铁硬度控制在HB165～190。实际上要使化学成分与金相组织同时达到上述刻苛要求是困难的,按规定的化学成分生
In the production and development of marine mainframes 60 / 110,50 / 110-2, according to the technical conditions, the liner (weighing 2 tons) shall be made of pearlitic gray cast iron with graphite of 90-360 (cupola melting), and its chemical composition %) Is C3 ~ 3.2, Si0.8 ~ 1.1, Mn0.7 ~ 0.9, V0.2 ~ 0.25, Ti0.05 ~ 0.07, P0.1 ~ 0.2, S≤0.12. Metallography does not allow the existence of free ferrite and cementite. Cast iron hardness control in HB165 ~ 190. In fact, to make the chemical composition and microstructure meet the above mentioned harsh requirements is difficult, according to the provisions of the chemical composition