碱性转炉铸铁

[机] basic bessemer cast iron, basic bessemer pig iron

jiǎn xìng zhuàn lú zhù tiě ㄐㄧㄢˇ ㄒㄧㄥˋ ㄓㄨㄢˋ ㄌㄨˊ ㄓㄨˋ ㄊㄧㄝˇ