Steel composition, method for making same and parts produced from said compositions, particularly valves
AssigneeSociete Industrielle de Metallurgie Avancee (S.I.M.A.)
InventorsJacques Montagnon, Frédéric Perdriset
Life of this patent
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Abstract
This invention relates to a steel composition comprising, expressed in percentages by weight: 0.25-0.35% C, 24-28% Cr, 10-15% Ni, 3-6% Mn, 1.75-2.50% Nb, 0.50-0.70% N, 0-0.30% Si, provided that C+N≧0.8%, the rest consisting mainly of iron and unavoidable impurities. The invention further relates to a method for making said compositions and valves produced from said compositions or using said method and exhibiting excellent mechanical strength and oxidation resistance at temperatures between 800 and 900° C.
Claims18
A steel composition comprising, expressed in percentages by weight:
- C 0.25-0.35% Cr 24-28% Ni 10-15% Mn 3-6% Nb 1.75-2.50% N 0.50-0.70% Si 0-0.30%
- whereby C+N≧0.8%, and the rest consists primarily of iron and the unavoidable impurities.
A method for the preparation of a steel having a composition of:
- C 0.25-0.35% Cr 24-28% Ni 10-15% Mn 3-6% Nb 1.75-2.50% N 0.50-0.70% Si 0-0.30%,
- comprising the steps of:
- preparing a consumable electrode of the said composition;
- and
- electroslag remelting the consumable electrode.
A part, comprising:
- a valve having a steel composition of:
- C 0.25-0.35% Cr 24-28% Ni 10-15% Mn 3-6% Nb 1.75-2.50% N 0.50-0.70% Si 0-0.30%,
- wherein the steel composition is prepared by:
- melting a consumable electrode of the said steel composition;
- and
- electroslag remelting the consumable electrode.
Dependencies are inferred from the claim text.