Field application and verification indicate that Ultrasonic Attenuation Method provides a easy,accurate and fast solution to the effective site identification of nodular cast iron and grey cast iron.

• 经过现场应用和验证,证明采用这种超声衰减法可以有效地解决上述球墨铸铁与灰口铸铁件的现场鉴别问题,且该方法简便、准确、快捷。