NR快速炼钢法
NR high speed steelmaking process
炼钢和连铸
Steelmaking and continuous casting
炼钢工人用带玻璃罩的帽子
hat with glass shield for steel-smelting worker
炼钢干法除尘灰
the steelmaking dry dust removal ash
炼钢粉尘酸浸液
acidic leaching solution of steelmaking flue dust
炼钢钒渣
vanadium slag from steel making