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US 12,371,766 B2Granted
Martensitic stainless alloy
AssigneeAlleima StripTech AB
InventorsSara Wiklund, Jonas Nilsson, Sven-Inge Mattsson, Anders Hoel, Guocai Chai
Life of this patent
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Abstract
A martensitic stainless alloy comprising, in percent by weight (wt. %) C >0.50 to 0.60; Si 0.10 to 0.60, Mn 0.40 to 0.80; Cr 13.50 to 14.50; Ni 0 to 1.20; Mo 0.80 to 2.50; N 0.050 to 0.12; Cu 0.10 to 1.50; V max 0.10; S max 0.03; P max 0.03; the balance being Fe an unavoidable impurities.
Claims23
A martensitic stainless alloy comprising, in percent by weight (wt. %):
- C
- >0.50 to 0.60;
- Si
- 0.10 to 0.60,
- Mn
- 0.40 to 0.80;
- Cr
- 13.50 to 14.50;
- Ni
- 0 to 1.20;
- Mo
- 0.80 to 2.50;
- N
- 0.050 to 0.12;
- Cu
- more than 0.4 to 1.50;
- V
- max 0.10;
- S
- max 0.03;
- P
- max 0.03;
- the balance being Fe and unavoidable impurities,
- wherein a microstructure of the martensitic stainless alloy includes a plurality of particles selected from the group consisting of metal carbonitrides;
- M23C6 and M7C3 carbides;
- and carbides of other types, where M represents one or more metallic atoms, and
- wherein a particle density of the plurality of particles is 56-58 per 100 μm2, a particle area fraction is 4.1 to 5.0%, a max particle diameter is 1.07 μm, and a volume fraction of particles having a diameter above 0.70 μm is 6-15%.
24 more elements
A flapper valve for a compressor, comprising:
- a flapper valve body formed of a martensitic stainless alloy, the martensitic stainless alloy having a composition including, in percent by weight (wt. %):
- C >0.50 to 0.60;
- Si 0.10 to 0.60;
- Mn 0.40 to 0.80;
- Cr 13.50 to 14.50;
- Ni 0 to 1.20;
- Cu more than 0.4 to 1.50;
- V max 0.10;
- S max 0.03;
- P max 0.03;
- the balance being Fe and unavoidable impurities,
- wherein a microstructure of the martensitic stainless alloy includes a plurality of particles selected from the group consisting of metal carbonitrides;
- M23C6 and M7C3 carbides;
- and carbides of other types, where M represents one or more metallic atoms, and
- wherein a particle density of the plurality of particles is 56-58 per 100 μm2, a particle area fraction is 4.1 to 5.0%, a max particle diameter is 1.07 μm, and a volume fraction of particles having a diameter above 0.70 μm is 6-15%.
12 more elements
Dependencies are inferred from the claim text.