懂中文 Dong Chinese

鍇

kǎi

high quality iron

Evolution

鍇 Seal script Shuowen (~100 AD)

Seal script

Shuowen (~100 AD)
鍇 Seal script Western Han dynasty (202 BC-9 AD)

Seal script

Western Han dynasty (202 BC-9 AD)
Definitions

锴 (鍇) 

kǎi

high quality iron