The noun 钢铁 (gāngtiě) means "steel" or "iron and steel." It combines 钢 (steel) and 铁 (iron) to refer broadly to steel products or the steel industry. It can also be used figuratively to describe something strong and unyielding.
这座城市的钢铁产量位居全国第一。
Zhè zuò chéngshì de gāngtiě chǎnliàng wèijū quánguó dì yī.
This city's steel production ranks first in the country.
他有着钢铁一般的意志。
Tā yǒuzhe gāngtiě yībān de yìzhì.
He has a will as strong as steel.
钢铁行业今年面临很大的挑战。
Gāngtiě hángyè jīnnián miànlín hěn dà de tiǎozhàn.
The steel industry faces great challenges this year.