US2025084518A1PendingUtilityA1
Hot stamped body
Est. expiryFeb 25, 2042(~15.6 yrs left)· nominal 20-yr term from priority
C21D 8/02C21D 8/00C23C 2/0224C23C 2/02C23C 2/40C23C 2/28C23C 2/12C23C 2/06C21D 9/48C22C 38/18C22C 38/001C21D 8/0278C21D 8/0263C21D 8/0236C21D 8/0226C22C 38/58C22C 38/48C22C 38/50C22C 38/54C22C 38/002C22C 38/008C22C 38/005C22C 38/24C22C 38/20C22C 38/30C22C 38/32C22C 38/22C22C 38/28C22C 38/26C22C 38/38C21D 6/008C21D 6/005C21D 1/18C21D 1/673C22C 38/06C22C 38/04C22C 38/02C21D 9/46C21D 8/021C21D 6/007C21D 6/004C21D 6/002B22D 11/001B21D 22/022C21D 2211/001C21D 2211/008C22C 38/60C22C 38/42C22C 38/44C22C 38/46C22C 38/52C21D 9/00C21D 8/0205
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Claims
Abstract
Provided is a hot stamped body having a predetermined chemical composition and a metallographic structure comprising, by volume ratio, martensite in 90% or more, wherein an average grain size of former austenite grains is 3.0 μm or less, a standard deviation in grain size distribution of former austenite grains is 1.5 μm or less, and a difference of a maximum value and a minimum value in a Vickers hardness distribution in a sheet thickness direction is 35% or less of an average value of the Vickers hardness distribution.
Claims
exact text as granted — not AI-modified1 . A hot stamped body having a chemical composition comprising, by mass %,
C: 0.40 to 0.70%, Si: 0.01 to 1.30%, Mn: 0.05 to 3.00%, P: 0.100% or less, S: 0.0100% or less, N: 0.0200% or less, O: 0.0200% or less, Al: 0.001 to 1.000%, Cr: 0.01 to 1.00%, Nb: 0 to 0.200%, Ti: 0 to 0.200%, Mo: 0 to 1.00%, B: 0 to 0.1000%, Co: 0 to 4.00%, Ni: 0 to 3.00%, Cu: 0 to 3.00%, V: 0 to 3.00%, W: 0 to 1.00%, Ca: 0 to 1.000%, Mg: 0 to 1.000%, REM: 0 to 1.000%, Sb: 0 to 1.000%, Zr: 0 to 1.000%, Sn: 0 to 1.000%, As: 0 to 0.100%, and balance: Fe and impurities, and a metallographic structure comprising, by volume ratio, martensite in 90% or more, wherein an average grain size of former austenite grains is 3.0 μm or less, a standard deviation in grain size distribution of former austenite grains is 1.5 μm or less, and a difference of a maximum value and a minimum value in a Vickers hardness distribution in a sheet thickness direction is 35% or less of an average value of the Vickers hardness distribution.
2 . The hot stamped body according to claim 1 , wherein the chemical composition contains, by mass %, one or more of
Nb: 0.001 to 0.200%, Ti: 0.001 to 0.200%, Mo: 0.001 to 1.00%, B: 0.0001 to 0.1000%, Co: 0.001 to 4.00%, Ni: 0.001 to 3.00%, Cu: 0.001 to 3.00%, V: 0.001 to 3.00%, W: 0.001 to 1.00%, Ca: 0.0001 to 1.000%, Mg: 0.0001 to 1.000%, REM: 0.0001 to 1.000%, Sb: 0.001 to 1.000%, Zr: 0.001 to 1.000%, Sn: 0.001 to 1.000%, and As: 0.001 to 0.100%.Join the waitlist — get patent alerts
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