Title of Invention

"A MARTENSITIC STAINLESS STEEL ALLOY AND THE METHOD THEREOF"

Abstract A method of making a martensitic stainless steel alloy having a unique combination of form tool machinability, hardness capabilities and corrosion resistance comprising the steps of melting an alloy consisting essentially of in weight percent Wt% Carbon 0.06-0.10 Manganese 0.50 max Silicon 0.40 max Phosphorous 0.60 max Sulfur 0.15-0.55 Chromium 12.00-12.60 Nickel 0.25 max. Molybdenum 0.10 max Aluminum 0.02 max. Copper 0.50 max. Nitrogen 0.04 max. and the balance being essentially iron. balancing the elements such that the %Chromium equivalent is not greater than 9.5% where % chromium equivalent = %Cr + %Si +1.5 x%Mo +10 x %A1 - %Ni - %Cu - 30(%C + %N); and then casting said alloy.
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We claim:
1. 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
Wt%
Carbon 0.06-0.10
Manganese 0.50 max
Silicon 0.40 max
Phosphorous 0.60 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 that the % Chromium equivalent is not greater than about 9.5% where
%Chromium equivalent = %Cr+%Si +%1.5x%Mo+10x%Al-%Ni-%Cu-30(%C+%N)
2. An alloy as claimed in claim 1 containing not more than about 0.35% silicon.
3. An alloy as claimed in claim 1 containing not more than about 0.20% nickel.
4. An alloy as claimed in claim 1 containing not more than about 12.50% chromium.
5. A martensitic stainless steel alloy as claimed in claim 1 containing in weight percent of 0.15-0.50 of Sulfur, 12.00 -12.5 of chromium, 0.20 max. of nickel and 0.35 max of silicon.
6. A method of making a martensitic stainless alloy having a unique combination of form tool machinability, hardness capabilities and corrosion resistance comprising the steps of melting an alloy consisting essentially of, in weight percent
Wt%
Carbon 0.06-0.10
Manganese 0.50 max
Silicon 0.40 max
Phosphorous 0.60 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 being essentially iron wherein the elements are balanced such that the % Chromium equivalent is not greater than about 9.5% where
%Chromium equivalent = %Cr+%Si +1.5x%Mo+10x%Al-%Ni-%Cu-30(%C+%N)
and then casting said alloy

Documents:

in-pct-2000-00081-del-abstract.pdf

in-pct-2000-00081-del-assignment.pdf

IN-PCT-2000-00081-DEL-Claims-(03-05-2010).pdf

in-pct-2000-00081-del-claims.pdf

in-pct-2000-00081-del-complete specification (as,files).pdf

in-pct-2000-00081-del-complete specification (granted).pdf

IN-PCT-2000-00081-DEL-Correspondence-Others-(03-05-2010).pdf

in-pct-2000-00081-del-correspondence-others.pdf

in-pct-2000-00081-del-correspondence-po.pdf

in-pct-2000-00081-del-description (complete).pdf

in-pct-2000-00081-del-form-1.pdf

in-pct-2000-00081-del-form-13.pdf

in-pct-2000-00081-del-form-19.pdf

in-pct-2000-00081-del-form-2.pdf

in-pct-2000-00081-del-form-3.pdf

in-pct-2000-00081-del-form-5.pdf

in-pct-2000-00081-del-pa.pdf

in-pct-2000-00081-del-pct-101.pdf

in-pct-2000-00081-del-pct-210.pdf

in-pct-2000-00081-del-pct-304.pdf

in-pct-2000-81-del-Correspondence Others-(30-03-2012).pdf

in-pct-2000-81-del-Petition-138-(30-03-2012).pdf


Patent Number 244580
Indian Patent Application Number IN/PCT/2000/00081/DEL
PG Journal Number 51/2010
Publication Date 17-Dec-2010
Grant Date 10-Dec-2010
Date of Filing 30-Jun-2000
Name of Patentee CRS HOLDINGS INC.
Applicant Address 209F BAYNARD BUILDING, 3411 SILVERSIDE ROAD, WILMINGTON, DELAWARE 19810, USA.
Inventors:
# Inventor's Name Inventor's Address
1 KOSA THEODORE 171 OAKMONT COURT READING, PA 19607, USA.
PCT International Classification Number C22C 38/18
PCT International Application Number PCT/US99/00611
PCT International Filing date 1999-01-12
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 09/008,264 1998-01-16 U.S.A.