High-manganese steel with superior weldability and method for manufacturing hot-dipped galvanized steel sheet from same
AssigneePosco
InventorsKwang-Geun Chin, Sun-Ho Jeon
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Abstract
The present invention relates to high-manganese steel with superior weldability and to a method for manufacturing hot-dipped galvanized steel sheets from same. The high-manganese steel according to one aspect of the present invention is characterized by comprising, by weight %: C: 0.3-1%; Mn: 8-25%; Al: 1-8%; Si: 0.1-3.0%; Ti: 0.01-0.2%; Sn: 0.06-0.2%; and B: 0.0005-0.01%, with the remainder being Fe and unavoidable impurities. The present invention may provide high-manganese hot-dipped galvanized steel sheets, having high strength and processability and superior surface quality, which can prevent plating failures caused by manganese.
Claims5
A high-manganese steel with superior coating adhesion comprising, by weight, C:
- 0.3-1%, Mn:
- 8-25%, Al:
- 1-8%, Si:
- 0.1-3.0%, Ti:
- 0.01-0.2%, Sn:
- 0.06-0.2%, B:
- 0.0005-0.01%, with the remainder being Fe and inevitable impurities.
A method for producing a hot-dip galvanized steel sheet, the method comprising:
- preparing a steel sheet comprising, by weight, C:
- 0.3-1%, Mn:
- 8-25%, Al:
- 1-8%, Si:
- 0.1-3.0%, Ti:
- 0.01-0.2%, Sn:
- 0.06-0.2%;
- B:
- 0.0005-0.01%, with the remainder being Fe and inevitable impurities;
- annealing the steel sheet under conditions having a dew point temperature of −30° C. to −60° C. and an annealing temperature of 750° C. to 850° C.;
- and
- dipping the annealed steel sheet in a hot-dipped galvanizing bath comprising, by weight, Al:
- 0.2-0.25% at a dipping temperature of 480° C. to 520° C.
Dependencies are inferred from the claim text.