Free-machining martensitic stainless steel
AssigneeCRS Holdings, Inc.
InventorTheodore Kosa
Life of this patent
Estimating the term…
Abstract
A corrosion resistant, martensitic stainless steel alloy is disclosed having the following composition in weight percent. ______________________________________ wt. % ______________________________________ Carbon 0.06-0.10 Manganese 0.50 max. Silicon 0.40 max. Phosphorus 0.060 max. Sulfur 0.15-0.55 Chromium 12.00-12.60 Nickel 0.25 max. Molybdenum 0.10 max. Copper 0.50 max. Nitrogen 0.04 max. ______________________________________ and the balance is essentially iron. This alloy provides a unique combination of form tool machinability, corrosion resistance, and hardenability, particularly in the annealed condition (100 HRB max.). The alloy is capable of being hardened to at least 35 HRC.
Claims9
A martensitic stainless steel alloy having a unique combination of form tool machinability, hardness capability, and corrosion resistance, said alloy consisting essentially of, in weight percent, about
- ______________________________________ wt. % ______________________________________ Carbon 0.06-0.10 Manganese 0.50 max. Silicon 0.40 max. Phosphorus 0.060 max. Sulfur 0.15-0.55 Chromium 12.00-12.60 Nickel 0.25 max. Molybdenum 0.10 max. Copper 0.50 max. Aluminum 0.02 max. Nitrogen 0.04 max. ______________________________________
- and the balance is essentially iron, wherein the elements are balanced such the % Chromium Equivalent is not greater than about 9.5%, where
- % Chrornium Equivalent=% Cr+% Si+1.5.times.% Mo+10.times.% Al-% Ni-% Cu-30(% C+% N).
A martensitic stainless steel alloy having a unique combination of form tool machinability, hardness capability, and corrosion resistance, said alloy consisting essentially of, in weight percent, about
- ______________________________________ wt. % ______________________________________ Carbon 0.06-0.10 Manganese 0.50 max. Silicon 0.35 max. Phosphorus 0.060 max. Sulfur 0.15-0.50 Chromium 12.00-12.50 Nickel 0.20 max. Molybdenum 0.10 max. Copper 0.50 max. Aluminum 0.02 max. Nitrogen 0.04 max. ______________________________________
- and the balance is essentially iron, wherein the elements are balanced such the % Chromium Equivalent is not greater than about 9.5%, where
- % Chromium Eciuivalent=% Cr+% Si+1.5.times.% Mo+10.times.% Al-% Ni-% Cu-30(% C+% N).
- 6.
Dependencies are inferred from the claim text.