The application of vermicular iron in China is earlier than in Europe and American, however, lower limit of vermicularity specified in the present Chinese standard of vermicular iron is relatively lower.
The application of vermicular iron in China is earlier than in Europe and American, however, lower limit of vermicularity specified in the present Chinese standard of vermicular iron is relatively lower.
蠕铁在我国的应用早于欧、美，但我国目前的蠕铁标准对蠕化率的要求尚低于欧美。