铁

金戈铁马

jīn gē tiě mǎ

very powerful army

金银铜铁锡

jīn yín tóng tiě xī

the five metals: gold, silver, copper, iron, tin

钛铁矿

tài tiě kuàng

ilmenite FeTiO3

铜墙铁壁

tóng qiáng tiě bì

copper wall, iron bastion (idiom); impenetrable defense

铣铁

xiǎn tiě

cast iron

钢铁

gāng tiě

steel

钢铁侠

gāng tiě xiá

Iron Man, comic book superhero

钢铁学院

gāng tiě xué yuàn

Beijing Steel and Iron Institute (the former name of 北京科技大學|北京科技大学[Bei3 jing1 Ke1 ji4 Da4 xue2], University of Science and Technology Beijing)

钢铁工业

gāng tiě gōng yè

steel industry

钢铁厂

gāng tiě chǎng

iron and steel works

铮铮铁汉

zhēng zhēng tiě hàn

a strong and determined man (idiom)

铮铮铁骨

zhēng zhēng tiě gǔ

see 鐵骨錚錚|铁骨铮铮[tie3 gu3 zheng1 zheng1]