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Nanban tetsu

Nanban tetsu (南蠻鉃)

Literally: Southern barbarian steel.
Damascus steel logo

Damascus steel

A rather broad term that is used to describe steel that exhibits a fancy pattern.
Twist-core logo

Twist-core steel

A type of pattern-welding using twisted rods of steel.
Huawengang logo

Huāwéngāng (花文鋼)

A type of pattern welding known in English as twist-core.