	US 11,873,542 B2
	High nickel alloy excellent in high welding temperature cracking resistance
Yukihiro Nishida, Tokyo (JP); Shinji Tsuge, Tokyo (JP); and Takahiro Osuki, Tokyo (JP)
Assigned to NIPPON STEEL STAINLESS STEEL CORPORATION, Tokyo (JP); and NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 18/036,699
Filed by NIPPON STEEL Stainless Steel Corporation, Tokyo (JP); and NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Apr. 12, 2022, PCT No. PCT/JP2022/017594 § 371(c)(1), (2) Date May 12, 2023, PCT Pub. No. WO2022/220242, PCT Pub. Date Oct. 20, 2022.
Claims priority of application No. 2021-068346 (JP), filed on Apr. 14, 2021; application No. 2021-068601 (JP), filed on Apr. 14, 2021; and application No. 2021-068602 (JP), filed on Apr. 14, 2021.
Prior Publication US 2023/0349027 A1, Nov. 2, 2023
Int. Cl. C22C 19/05 (2006.01); C22C 38/58 (2006.01)

CPC C22C 19/055 (2013.01) [C22C 38/58 (2013.01)]

12 Claims

1. A high-Ni alloy having an excellent weld hot cracking resistance, comprising: in mass %, C: 0.15% or less, Si: 0.05 to 2.0%, Mn: 0.05 to 2.0%, P: 0.035% or less, S: 0.0015% or less, Cr: 16 to 30%, Ni: 18 to 50%, Al: 0.01 to 1.0%, Ti: 0.01 to 1.5%, N: 0.35% or less, O: 0.003% or less, Mo: 8% or less, Cu: 4% or less, Co: 3% or less, Ca: 0.0003 to 0.0050%, Mg: 0.0060% or less, and a balance consisting of Fe and impurities, wherein

a relationship between a number density of TiC precipitates each having 1.0 μm or more of an equivalent circle diameter and a Mg content in steel satisfies a formula (1) below,

number density of TiC (number of pieces/mm²)≤463−9.5×Mg concentration in steel (mass ppm) (1).