It gives average levels and distributions of degree of normality RG, relative hardness RH and quality index Q_i for this materials and compares them with the advanced level of our country and overeas.

• 用现代统计方法,对所生产的船用高强度灰铸铁件的理化测试报告进行了综合统计分析,给出了其成熟度RG、相对硬度RH及品质系数Q_i等铸铁综合质量指标的平均水平及分布情况,并与国外先进水平进行了比较分析。