High-strength steel sheet and production method therefor and high-strength galvanized steel sheet and production method therefor (as amended)
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United States of America Patent
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Jan 8, 2019
Grant Date -
Jan 7, 2016
app pub date -
Feb 28, 2014
filing date -
Mar 4, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
Provided is a high-strength steel sheet that has good chemical convertibility and good corrosion resistance after electro deposition painting despite high Si and Mn contents. Also provided are a method for producing the high-strength steel sheet, a high-strength galvanized steel sheet formed by using the high-strength steel sheet, and a method for producing the high-strength galvanized steel sheet. A steel sheet containing, in terms of % by mass, C: 0.03 to 0.35%, Si: 0.01 to 0.50%, Mn: 3.6 to 8.0%, Al: 0.001 to 1.00%, P≤0.10%, S≤0.010%, and the balance being Fe and unavoidable impurities is annealed under condition under which a dew point of an atmosphere in a temperature zone of 550° C. or higher and A° C. or lower (A is a particular value that satisfies 600≤A≤750) inside an annealing furnace is controlled to −40° C. or lower.
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International Classification(s)
- C23C:COATING METALLIC MATERIAL; COATING MATERIAL WITH M....
- C21D:MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS....
- C23F:NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM S....
- C22C:ALLOYS
- B32B:LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA....
- C25F:PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIAL....
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