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US 12,473,616 B2Granted
Blank for a Damascus patterned article
AssigneeDamasteel AB
InventorPer Jarbelius
Life of this patent
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Abstract
The invention relates to a stainless steel blank for making a Damascus patterned article, wherein the steel blank is made from at least two different nitrogen alloyed stainless steels having a chromium content of 11-25 weight %, of which at least one of the steels comprises nitrogen in an amount of 0.10-5.0 weight % and, optionally, at least one of the steels comprises nitrogen in an amount of 0.01-0.5 weight %.
Claims18
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 %.
8 more elements
Dependencies are inferred from the claim text.