球墨铸铁与铸铁和铸钢的比较 How Ductile Iron Compares to Cast Iron and Cast Steel 美国尼伯科有限公司 最小机械性能 Minimum Mechanical Properties 化学分析 Chemical Analysis 铸铁 ASTM A 126 级别 B* Cast Iron ASTM A 126 Class B* 球墨铸铁 ASTM A 395 Ductile Iron ASTM A 395 铸钢 ASTM A 216 WCB Cast Steel ASTM A 216 WCB 铁和其它元素 % Iron and Residuals% 94.0 94.5 98.1 碳% Carbon% 3.3 3.0 0.3 硅% Silicon% 2.0 2.5 0.6 锰% Manganese% 0.7 1.0 *