US4891080A
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Workable boron-containing stainless steel alloy article, a mechanically worked article and process for making thereof
Assignee: CRS Holdings LLC
•
Filing: 1988-06-06
•
Granted: 1990-01-02
•
Expires: 2008-06-06
Abstract
Abstract A workable, boron-containing, stainless steel alloy and an article formed therefrom are disclosed together with a process for manufacturing same. The alloy consists essentially of, in weight percent, about ______________________________________ w/o ______________________________________ Carbon 0.10 max. Manganese 2.00 max. Silicon 1.00 max. Phosphorus 0.045 max. Sulfur 0.010 max. Chromium 16.00-22.00 Nickel 10.00-15.00 Molybdenum 0-3.0 Boron 0.2-2.0 Nitrogen 0.075 max. ______________________________________ and the balance consisting essentially of iron. The as-worked alloy in accordance with the invention is characterized by having a boride particle areal density per weight percent boron (A N ) defined by the relationship A.sub.N ≧58,080-18,130 (%B). The as-worked alloy of the invention is further characterized by having a Charpy V-notch impact strength (CVN) defined by the relationship CVN≧85.917 x e.sup.-1.20297(%B).
Inventors
- 👤 Gregory J. Del Corso
- 👤 James W. Martin
- 👤 David L. Strobel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:23
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/54; Y; Y10; Y10S; Y10S376/00; Y10S376/90
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
96 words
An article formed of an austenitic stainless steel alloy consisting essentially of, in weight percent, about ______________________________________
w/o
______________________________________
Carbon 0.10 max.
Manganese 2.00 max.
Silicon 1.00 max.
Phosphorus 0.045 max.
Sulfur 0.010 max.
Chromium 16.00-22.00
Nickel 10.00-15.00
Molybdenum 0-3.0
Boron 0.2-2.0
Nitrogen 0.075 max.
______________________________________ and the balance consisting essentially of iron, said article having a boride particle areal density per weight percent boron (A N ) defined by the relationship A.sub.N ≧58,080-18,130 (% B) and said article further having a Charpy V-notch impact strength (CVN) defined by the relationship CVN≧85.917 x e.sup.-1.20297 (% B).
Claim 2
Dependent Claim
96 words
An article formed of an austenitic stainless steel alloy consisting essentially of, in weight percent, about ______________________________________
w/o
______________________________________
Carbon 0.10 max.
Manganese 2.00 max.
Silicon 1.00 max.
Phosphorus 0.045 max.
Sulfur 0.010 max.
Chromium 16.00-22.00
Nickel 10.00-15.00
Molybdenum 0-3.0
Boron 0.2-2.0
Nitrogen 0.075 max.
______________________________________ and the balance consisting essentially of iron, said article having a boride particle areal density per weight percent boron (A N ) defined by the relationship A.sub.N ≧58,080-18,130 (% B) and said article further having a Charpy V-notch impact strength (CVN) defined by the relationship CVN≧85.917 x e.sup.-1.20297 (% B).
Claim 3
Dependent Claim
19 words
An article as set forth in claim 1 wherein the alloy contains not more than about 0.005% max. sulfur.
Claim 4
Dependent Claim
19 words
An article as set forth in claim 2 wherein the alloy contains not more than about 0.03% max. nitrogen.
Claim 5
Dependent Claim
18 words
An article as set forth in claim 3 wherein the alloy contains not more than about 1.8% boron.
Claim 6
Dependent Claim
17 words
An article as set forth in claim 1 wherein the alloy contains at least about 10.50% nickel.
Claim 7
Dependent Claim
15 words
An article as set forth in claim 5 wherein the alloy contains about 18.00-20.00% chromium.
Claim 8
Dependent Claim
24 words
An article as set forth in claim 1 having a Charpy V-notch impact strength (CVN) defined by the relationship CYN≧90.396 x e.sup.-1.16702 (% B).
Claim 9
Dependent Claim
24 words
An article as set forth in claim 3 having a Charpy V-notch impact strength (CVN) defined by the relationship CVN≧106.20 x e.sup.-0.90942 (% B).
Claim 10
Dependent Claim
99 words
A mechanically worked article formed of an austenitic stainless steel alloy consisting essentially of, in weight percent, about ______________________________________
w/o
______________________________________
Carbon 0.08 max.
Manganese 2.00 max.
Silicon 0.75 max.
Phosphorus 0.045 max.
Sulfur 0.005 max.
Chromium 16.00-22.00
Nickel 10.50-15.00
Molybdenum 2.5 max.
Boron 0.2-1.8
Nitrogen 0.03 max.
______________________________________ and the balance consisting essentially of iron, said article having a boride particle areal density per weight percent boron (A N ) defined by the relationship A.sub.N ≧58,080-18,130 (% B); and said article further having a Charpy V-notch impact strength (CVN) defined by the relationship CVN≧90.396 x e.sup.-1.16702 (% B).
Claim 11
Dependent Claim
99 words
A mechanically worked article formed of an austenitic stainless steel alloy consisting essentially of, in weight percent, about ______________________________________
w/o
______________________________________
Carbon 0.08 max.
Manganese 2.00 max.
Silicon 0.75 max.
Phosphorus 0.045 max.
Sulfur 0.005 max.
Chromium 16.00-22.00
Nickel 10.50-15.00
Molybdenum 2.5 max.
Boron 0.2-1.8
Nitrogen 0.03 max.
______________________________________ and the balance consisting essentially of iron, said article having a boride particle areal density per weight percent boron (A N ) defined by the relationship A.sub.N ≧58,080-18,130 (% B); and said article further having a Charpy V-notch impact strength (CVN) defined by the relationship CVN≧90.396 x e.sup.-1.16702 (% B).
Claim 12
Dependent Claim
21 words
A mechanically worked article as set forth in claim 9 wherein the alloy contains not more than about 0.002% max. sulfur.
Claim 13
Dependent Claim
20 words
A mechanically worked article as set forth in claim 10 wherein the alloy contains not more than about 0.015% nitrogen.
Claim 14
Dependent Claim
20 words
A mechanically worked article as set forth in claim 11 wherein the alloy contains not more than about 1.6% boron.
Claim 15
Dependent Claim
19 words
A mechanically worked article as set forth in claim 9 wherein the alloy contains at least about 12.00% nickel.
Claim 16
Dependent Claim
17 words
A mechanically worked article as set forth in claim 13 wherein the alloy contains about 18.00-20.00% chromium.
Claim 17
Dependent Claim
26 words
A mechanically worked article as set forth in claim 9 having a Charpy V-notch impact strength (CVN) defined by the relationship CVN≧106.20 x e.sup.-0.90942 (% B.)
Claim 18
Dependent Claim
110 words
In a process for making a boron containing stainless steel article the steps of melting an alloy consisting essentially of in weight percent about ______________________________________
w/o
______________________________________
Carbon 0.10 max.
Manganese 2.00 max.
Silicon 1.00 max.
Phosphorus 0.045 max.
Sulfur 0.010 max.
Chromium 16.00-22.00
Nickel 10.00-15.00
Molybdenum 0-3.0
Boron 0.2-2.0
Nitrogen 0.075 max.
Iron Bal.;
______________________________________ consolidating said alloy at a temperature below the incipient melting temperature of said alloy such that the growth of boride particles in said alloy is limited, and mechanically working the consolidated alloy to provide a boride particle areal density per weight percent boron (A N ) defined by the relationship A.sub.N ≧58,080-18,130 (% B).
Claim 19
Dependent Claim
110 words
In a process for making a boron containing stainless steel article the steps of melting an alloy consisting essentially of in weight percent about ______________________________________
w/o
______________________________________
Carbon 0.10 max.
Manganese 2.00 max.
Silicon 1.00 max.
Phosphorus 0.045 max.
Sulfur 0.010 max.
Chromium 16.00-22.00
Nickel 10.00-15.00
Molybdenum 0-3.0
Boron 0.2-2.0
Nitrogen 0.075 max.
Iron Bal.;
______________________________________ consolidating said alloy at a temperature below the incipient melting temperature of said alloy such that the growth of boride particles in said alloy is limited, and mechanically working the consolidated alloy to provide a boride particle areal density per weight percent boron (A N ) defined by the relationship A.sub.N ≧58,080-18,130 (% B).
Claim 20
Dependent Claim
33 words
A process as set forth in claim 16 wherein the step of mechanically working the alloy comprises the step of reducing the cross-sectional area of the consolidated alloy by at least about 85%.
Claim 21
Dependent Claim
37 words
A process as set forth in claim 16 wherein the step of consolidating the alloy comprises the steps of atomizing the molten alloy to form an alloy powder, and compacting the alloy powder to substantially full density.
Claim 22
Dependent Claim
23 words
A process as set forth in claim 17 wherein the step of reducing the cross-sectional area is accomplished by flat rolling the alloy.
Claim 23
Dependent Claim
31 words
A process as set forth in claim 19 wherein the alloy is flat rolled to provide a Charpy V-notch impact strength (CVN) defined by the relationship CVN≧85.917 x e.sup.-1.20297 (% B).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-01 | 1993-07-03 | 1994-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-01 | 1997-07-03 | 1998-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-01 | 2001-07-03 | 2002-01-02 | $7700.00 | Window Closed / Lapsed |