Correct

钢印

/ gāng yìn / 
Strokes

Example

As a Noun

steel/embossing seal

1
Zài
在
zhèngshū
证书
shàng
上
jiāgài
加盖
gāngyìn
钢印

stamp a certificate with the steel seal

2
Gěi
给
zìxíngchē
自行车
dá
打
gāngyìn
钢印

stamp the cycle registration number on a bicycle

3
Gài
盖
gāng
钢
yìn
印

affix/impress/set a steel seal (to)

As a Noun

embossed seal/stamp