niobium-bearing-hot metal
用铌中间合金处理铁水，对所浇注的试样作了耐磨性试验研究表明，当含铌量为0.15 ~ 0.4%时，铌铸铁较普通铸铁耐磨性提高5倍左右。
The wear resistance of niobium alloyed cast iron was studied. Result shows that the wea resistance of cast iron containing 0.15-0.4%nb is about 5 times higher than gray iron.
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