	US 12,410,496 B2
	Superaustenitic material
Rainer Fluch, St. Lorenzen im Mürztal (AT); and Andreas Keplinger, Leoben (AT)
Assigned to voestalpine BOHLER Edelstahl GmbH & Co. KG, Kapfenberg (AT)
Appl. No. 17/414,008
Filed by voestalpine BÖHLER Edelstahl GmbH & Co KG, Kapfenberg (AT)
PCT Filed Dec. 19, 2019, PCT No. PCT/EP2019/086384 § 371(c)(1), (2) Date Nov. 18, 2021, PCT Pub. No. WO2020/127788, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 10 2018 133 255.6 (DE), filed on Dec. 20, 2018.
Prior Publication US 2023/0332282 A1, Oct. 19, 2023 Prior Publication US 2024/0052469 A2, Feb. 15, 2024
Int. Cl. C22C 38/54 (2006.01); C21D 7/02 (2006.01); C21D 7/13 (2006.01); C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/52 (2006.01); C22C 38/58 (2006.01)

CPC C22C 38/54 (2013.01) [C21D 7/02 (2013.01); C21D 7/13 (2013.01); C21D 8/0205 (2013.01); C21D 8/0273 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/52 (2013.01); C22C 38/58 (2013.01); C21D 2211/001 (2013.01)]

23 Claims

1. A precipitation-free superaustenitic material comprising an alloy with the following alloy elements in % by weight:


	Elements

	Carbon (C)	0.01-0.25
	Silicon (Si)	<0.5
	Manganese (Mn)	3.0-8.0
	Phosphorus (P)	<0.05
	Sulfur (S)	<0.005
	Iron (Fe)	residual
	Chromium (Cr)	23.0-30.0
	Molybdenum (Mo)	2.0-4.0
	Nickel (Ni)	10.0-16.0
	Vanadium (V)	<0.5
	Tungsten (W)	<0.5
	Copper (Cu)	<0.5
	Cobalt (Co)	<5.0
	Titanium (Ti)	<0.1
	Aluminum (Al)	<0.2
	Niobium (Nb)	<0.1
	Boron (B)	<0.01
	Nitrogen (N)	0.50-0.90

balance Iron (Fe) and inevitable impurities;

wherein the precipitation-free superaustenitic material is cold-formed with sufficient deformation to yield a tensile strength Rm of at least 1100 MPa, a notched-bar toughness KV of at least 80 J, and Rm multiplied by KV is greater than 100,000 MPa-J.