US 12,473,616 B2
Blank for a Damascus patterned article
Per Jarbelius, Gävle (SE)
Assigned to Damasteel AB, Söderfors (SE)
Appl. No. 17/059,433
Filed by Damasteel AB, Söderfors (SE)
PCT Filed May 17, 2019, PCT No. PCT/SE2019/050454
§ 371(c)(1), (2) Date Nov. 28, 2020,
PCT Pub. No. WO2019/231379, PCT Pub. Date Dec. 5, 2019.
Claims priority of application No. 1850646-9 (SE), filed on May 28, 2018.
Prior Publication US 2021/0207250 A1, Jul. 8, 2021
Int. Cl. C22C 38/24 (2006.01); B22F 3/15 (2006.01); B22F 3/17 (2006.01); B22F 5/00 (2006.01); C21D 8/02 (2006.01); C22C 33/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/22 (2006.01); B22F 1/05 (2022.01)
CPC C22C 33/0285 (2013.01) [B22F 3/15 (2013.01); B22F 3/17 (2013.01); B22F 5/006 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); B22F 1/05 (2022.01); B22F 2005/001 (2013.01); B22F 2301/35 (2013.01); B22F 2303/01 (2013.01); B22F 2303/40 (2013.01); B22F 2304/10 (2013.01); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01); C22C 2202/02 (2013.01)] 18 Claims
 
1. A stainless steel blank for making a Damascus patterned article, comprising:
a core comprising a nitrogen alloyed, martensitic stainless steel comprising chromium in an amount of 11 to 25 weight %, nitrogen in an amount of 0.60 to 5.0 weight %, vanadium in an amount of 0.90 to 5 weight %, and carbon in an amount of at least 0.2 weight %,
a first steel layer comprising a nitrogen alloyed, martensitic stainless steel comprising chromium in an amount of 11 to 25 weight %, nitrogen in an amount of 0.01 to 0.5 weight %, and carbon in an amount of at least 0.2 weight %,
wherein the core is made from a powder or a solid steel plate produced by powder metallurgy,
wherein the first steel layer is made from a powder,
wherein the core steel has a thickness of 10-50% of a total thickness of the stainless steel blank,
wherein the stainless steel blank comprises 5-100 steel layers on each side of the core,
wherein at least one steel layer of the stainless steel blank has a matrix with a PREN>25,
wherein the PREN=weight % Cr+3.3 weight % Mo+30 weight % N,
wherein a difference in the PREN between adjacent steel layers is >1,
wherein the Cr, Mo, and N are dissolved in the matrix, and
wherein a combined content of carbon and nitrogen in the core and in the first steel layer is at least 0.5 weight %.