US2024229204A9PendingUtilityA9
Hot-stamp formed body
Est. expiryOct 27, 2041(~15.2 yrs left)· nominal 20-yr term from priority
C21D 8/02C21D 8/00B21D 22/022C21D 2211/008C22C 38/08C22C 38/16C22C 38/10C22C 38/12C22C 38/001C22C 38/24C22C 38/002C22C 38/30C22C 38/20C22C 38/22C22C 38/54C22C 38/50C22C 38/48C22C 38/38C22C 38/32C22C 38/28C22C 38/26C22C 38/06C22C 38/04C22C 38/02C22C 38/008C22C 38/005C21D 2211/001C21D 9/46C21D 8/0263C21D 8/0236C21D 8/0226C21D 6/008C21D 6/007C21D 6/005C21D 6/004C21D 6/002C21D 1/18C22C 38/46C22C 38/42C22C 38/52C22C 38/44C21D 9/0068C22C 38/34C22C 38/14C22C 38/60C21D 9/00C22C 38/00C22C 38/58C21D 8/0205
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Claims
Abstract
A hot-stamp formed body has a predetermined chemical composition and has a microstructure including, by area ratio, martensite: 90% to 100% and a remainder in the microstructure: 0% to 10%. The percentage of martensite having a GAIQ value of 40000 or less in all of the martensite is less than 5.0%, an average grain size of prior austenite grains is 6.0 μm or less, and a standard deviation of grain sizes of the prior austenite grains is 2.6 μm or less.
Claims
exact text as granted — not AI-modified1 . A hot-stamp formed body comprising, as a chemical composition, by mass %:
C: 0.42% to 0.70%; Si: 0.010% to 1.300%; Mn: 0.100 to 3.000%; P: 0.100% or less; S: 0.0100% or less; N: 0.0200% or less; O: 0.0200% or less; Al: 0.001% to 0.500%; Cr: 0.010% to 0.800%; Ti: 0.010% to 0.100%; Nb: 0.0010% to 0.1000%; B: 0.0005% to 0.0200%; Mo: 0% to 1.000%; Co: 0% to 4.00%; Ni: 0% to 3.00%; Cu: 0% to 3.00%; V: 0% to 1.00%; W: 0% to 1.00%; Ca: 0% to 1.0000%; Mg: 0% to 1.0000%; REM: 0% to 1.0000%; Sb: 0% to 1.00%; Zr: 0% to 1.00%; Sn: 0% to 1.00%; As: 0% to 1.0000%; and a remainder: Fe and impurities, wherein the hot-stamp formed body has a microstructure including, by area ratio, martensite: 90% to 100% and a remainder in the microstructure: 0% to 10%, a percentage of martensite having a GAIQ value of 40000 or less in all of the martensite is less than 5.0%, an average grain size of prior austenite grains is 6.0 μm or less, and a standard deviation of grain sizes of the prior austenite grains is 2.6 μm or less.
2 . The hot-stamp formed body according to claim 1 ,
wherein the chemical composition contains, by mass %, one or more of: Mo: 0.001% to 1.000%; Co: 0.01% to 4.00%; Ni: 0.01% to 3.00%; Cu: 0.01% to 3.00%; V: 0.01% to 1.00%; W: 0.01% to 1.00%; Ca: 0.0001% to 1.0000%; Mg: 0.0001% to 1.0000%; REM: 0.0001% to 1.0000%; Sb: 0.001% to 1.00%; Zr: 0.001% to 1.00%; Sn: 0.001% to 1.00%; and As: 0.0001% to 1.0000%.
3 . The hot-stamp formed body according to claim 1 ,
wherein the average grain size of the prior austenite grains is more than 3.0 μm.
4 . The hot-stamp formed body according to claim 2 ,
wherein the average grain size of the prior austenite grains is more than 3.0 μm.Join the waitlist — get patent alerts
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