Nb has little effect on matrix structure of gray cast iron.
铌对过冷灰铸铁的基体组织无明显影响。
Gray cast iron, ductile iron, carbon steel.
灰铸铁，球墨铸铁，碳钢。
Gray cast iron is a common material for the part of the agricultural machinery.
灰铁为农机零件常用材料，磨损是灰铁零件最常见的失效形式。
Gray cast iron is a common material for the part of the agricultural machinery.
灰铁为农机零件常用材料，磨损是灰铁零件最常见的失效形式。
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