Vermicular cast iron alloy, internal combustion engine cylinder body and cylinder cover

The invention relates to a vermicular graphite cast iron alloy, an internal combustion engine cylinder body and a cylinder cover. The vermicular graphite cast iron alloy is especially designed for internal combustion engine cylinder bodies and cylinder covers with special requirements on mechanical strength and machinability; the vermicular graphite alloy has a microstructure that results in high mechanical properties such as a minimum strength limit of 500 MPa, a minimum yield limit of 350 MPa, and good machinability; in addition, the ferritization factor must be such that it is between 3.88 and 5.48. The set of performance makes it possible to design new engine cylinder blocks and cylinder covers with complex geometrical shapes and high mechanical properties without affecting machinability, so that the new engine cylinder blocks and cylinder covers are attractive in both technical and economic aspects. 本发明涉及一种蠕墨铸铁合金、内燃发动机缸体和缸盖。该蠕墨铸铁合金，特别为对机械强度和可机加工性有特别要求的内燃发动机缸体和缸盖设计；所述蠕墨合金具有导致高机械性能值例如500MPa的最小强度极限、350MPa的最