25-01-2018 дата публикации
Номер: US20180023171A1
Принадлежит:
Provided is a warm-pressed member comprising, by weight %, C: 0.01% to 0.5%, Si: 3.0% or less (excluding 0%), Mn: 3% to 15%, P: 0.0001% to 0.1%, S: 0.0001% to 0.03%, Al: 3.0% or less (excluding 0%), N: 0.03% or less (excluding 0%), and the balance of Fe and inevitable impurities. After a warm press forming process and a cooling process, the warm-pressed member has a microstructure comprising: 5 volume % to 50 volume % of retained austenite; and at least one of ferrite, martensite, tempered martensite, and bainite as a remainder. 1. A warm-pressed member comprising , by weight % , C: 0.01% to 0.5% , Si: 3.0% or less (excluding 0%) , Mn: 3% to 15% , P: 0.0001% to 0.1% , S: 0.0001% to 0.03% , Al: 3.0% or less (excluding 0%) , N: 0.03% or less (excluding 0%) , and the balance of Fe and inevitable impurities ,wherein after a warm press forming process and a cooling process, the warm-pressed member has a microstructure comprising: 5 volume % to 50 volume % of retained austenite; and at least one of ferrite, martensite, tempered martensite, and bainite as a remainder.2. The warm-pressed member of claim 1 , wherein the warm-pressed member has a tensile strength of 1000 MPa or greater and an elongation of 10% or greater.3. The warm-pressed member of claim 1 , further comprising 0.001% to 0.4% of at least one selected from the group consisting of Ti claim 1 , Nb claim 1 , Zr claim 1 , and V.4. The warm-pressed member of claim 1 , further comprising 0.005% to 2.0% of at least one of Cu and Ni.5. The warm-pressed member of claim 1 , further comprising 0.0001% to 1.0% of at least one of Sb and Sn.6. The warm-pressed member of claim 1 , further comprising 0.0001% to 0.01% of B. The present disclosure relates to a steel sheet for automobile structural members or reinforcement members, and more particularly, to a steel sheet that may be increased in strength, elongation, shock-absorbing ability, and plating corrosion resistance after a warm press forming process. In addition, the ...
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