US 12,428,698 B2
Abrasion-resistant steel plate and method of producing abrasion-resistant steel plate
Shigeki Kitsuya, Tokyo (JP); Hitoshi Sueyoshi, Tokyo (JP); and Tomoyuki Yokota, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/999,047
Filed by JFE STEEL CORPORATION, Tokyo (JP)
PCT Filed May 25, 2021, PCT No. PCT/JP2021/019888
§ 371(c)(1), (2) Date Nov. 17, 2022,
PCT Pub. No. WO2021/241604, PCT Pub. Date Dec. 2, 2021.
Claims priority of application No. 2020-093665 (JP), filed on May 28, 2020.
Prior Publication US 2023/0175091 A1, Jun. 8, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C21D 9/46 (2006.01); C21D 1/18 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/38 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/52 (2006.01); C22C 38/54 (2006.01); C22C 38/58 (2006.01)
CPC C21D 9/46 (2013.01) [C21D 1/18 (2013.01); C21D 6/002 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/007 (2013.01); C21D 6/008 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0263 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/38 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/52 (2013.01); C22C 38/54 (2013.01); C22C 38/58 (2013.01); C21D 2211/008 (2013.01)] 10 Claims
 
1. An abrasion-resistant steel plate comprising
a chemical composition containing, in mass %,
C: 0.20% to 0.45%,
Si: 0.10% to 1.00%,
Mn: 0.50% to 2.0%,
P: 0.020% or less,
S: 0.010% or less,
Cr: 0.01% to 2.0%,
Ti: 0.10% to 1.00%,
B: 0.0003% to 0.0100%,
Al: 0.01% to 0.06%, and
N: 0.0100% or less,
with a balance consisting of Fe and inevitable impurities,
wherein a volume fraction of martensite at a depth of 1 mm from a surface of the abrasion-resistant steel plate is 90% or more,
a number density of TiC precipitates of 0.5 μm or more in equivalent circular diameter at a depth of 1 mm from the surface is 400/mm2 or more,
hardness at a depth of 1 mm from the surface is 360 HBW 10/3000 or more in Brinell hardness, and
a transverse direction hardness difference is 30Hv10 or less in Vickers hardness, the transverse direction hardness difference being defined as a difference in the hardness at a depth of 1 mm from the surface between two points adjacent at intervals of 10 mm in a transverse direction of the abrasion-resistant steel plate.