US4119765A
Expired / Lapsed
US
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Welded ferritic stainless steel articles
Assignee: Crucible Materials Corp
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Filing: 1977-08-04
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Granted: 1978-10-10
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Expires: 1997-08-04
Abstract
Abstract A stainless steel welded article with excellent corrosion resistance, formability and notch toughness, such as welded tubing and the like, made from a columbium and/or titanium stabilized substantially fully ferritic stainless steel consisting essentially of, in weight percent, below 0.04 carbon, below 0.04 nitrogen, the sum of the carbon and nitrogen contents being above 0.006 and below 0.07, up to 1.0 manganese, up to 1.0 silicon, 23.0 to less than 28.0 chromium, 2.00 to 4.75 nickel, 0.75 to 3.50 molybdenum, and the balance iron and incidental impurities. When carbon plus nitrogen is in the range of 0.006 to 0.04, columbium in the amount of 0.05 to 0.70 may be used alone, but the columbium content must be at lest equal to eight times the carbon plus nitrogen content. When carbon plus nitrogen is in the range of 0.02 to 0.07, titanium in the amount of 0.12 to 0.70 may be used alone, providing titanium is present in an amount at least equal to six times the carbon plus nitrogen content, or it may be used in combination with columbium with each being present in an amount up to 0.30 providing the titanium and columbium contents are at least equal to those satisfying the following equation: % Ti/6 + % Cb/8 = (% C + % N) when the molybdenum content is within the range of 2.50 or 3.00 to 3.50% nickel may be lowered to 1%.
Inventors
- 👤 Kenneth E. Pinnow
- 👤 Jerome P. Bressanelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:57
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/50; C22C38/48; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12958; Y10T428/12965
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
96 words
A substantially fully ferritic stainless steel welded article with excellent formability and notch toughness and high corrosion resistance, said welded article consisting essentially of, in weight percent, 0.003 to below 0.04 carbon, 0.003 to below 0.04 nitrogen, the sum of the carbon and nitrogen content being 0.006 to below 0.04, up to 1.0 manganese, up to 1.0 silicon, 23.0 to less than 28.0 chromium, 2.00 to 4.75 nickel, 0.75 to 3.50 molybdenum, 0.05 to 0.70 columbium, with columbium being at least equal to eight times the carbon plus nitrogen, and the balance iron and incidental impurities.
Claim 2
Dependent Claim
96 words
A substantially fully ferritic stainless steel welded article with excellent formability and notch toughness and high corrosion resistance, said welded article consisting essentially of, in weight percent, 0.003 to below 0.04 carbon, 0.003 to below 0.04 nitrogen, the sum of the carbon and nitrogen content being 0.006 to below 0.04, up to 1.0 manganese, up to 1.0 silicon, 23.0 to less than 28.0 chromium, 2.00 to 4.75 nickel, 0.75 to 3.50 molybdenum, 0.05 to 0.70 columbium, with columbium being at least equal to eight times the carbon plus nitrogen, and the balance iron and incidental impurities.
Claim 3
Dependent Claim
22 words
The substantially fully ferritic stainless welded article of claim 1 wherein the molybdenum content is within the range of 0.75 to 2.75%.
Claim 4
Dependent Claim
22 words
The substantially fully ferritic stainless welded article of claim 1 wherein the nickel content is within the range of 3.00 to 4.75%.
Claim 5
Dependent Claim
35 words
The substantially fully ferritic stainless steel welded article of claim 1 wherein the molybdenum content is within the range of 0.75 to 2.75% and the nickel content is within the range of 3.00 to 4.75%.
Claim 6
Dependent Claim
35 words
The substantially fully ferritic stainless steel welded article of claim 1 wherein the molybdenum content is within the range of 2.00 to 3.50% and the nickel content is within the range of 3.00 to 4.75%.
Claim 7
Dependent Claim
30 words
The substantially fully ferritic stainless steel welded article of claim 1 wherein said welded article has an aswelded Olsen cup height exceeding 0.250 in. at a thickness of 0.060 in.
Claim 8
Dependent Claim
94 words
A substantially fully ferritic stainless steel welded article with excellent formability, notch toughness and high corrosion resistance, said welded article consisting essentially of, in weight percent, up to 0.04 carbon, up to 0.04 nitrogen, the sum of the carbon plus nitrogen content being above 0.02 but below 0.07, up to 1.0 manganese, up to 1.0 silicon, 23.0 to less than 28.0 chromium, 2.00 to 4.75 nickel, 0.75 to 3.50 molybdenum, 0.12 to 0.70 titanium, with titanium being at least equal to six times the carbon plus nitrogen, and the balance iron and incidental impurities.
Claim 9
Dependent Claim
94 words
A substantially fully ferritic stainless steel welded article with excellent formability, notch toughness and high corrosion resistance, said welded article consisting essentially of, in weight percent, up to 0.04 carbon, up to 0.04 nitrogen, the sum of the carbon plus nitrogen content being above 0.02 but below 0.07, up to 1.0 manganese, up to 1.0 silicon, 23.0 to less than 28.0 chromium, 2.00 to 4.75 nickel, 0.75 to 3.50 molybdenum, 0.12 to 0.70 titanium, with titanium being at least equal to six times the carbon plus nitrogen, and the balance iron and incidental impurities.
Claim 10
Dependent Claim
23 words
The substantially fully ferritic stainless steel welded article of claim 7 wherein the molybdenum content is within the range of 0.75 to 2.75%.
Claim 11
Dependent Claim
23 words
The substantially fully ferritic stainless steel welded article of claim 7 wherein the nickel content is within the range of 3.00 to 4.75.
Claim 12
Dependent Claim
35 words
The substantially fully ferritic stainless steel welded article of claim 7 wherein the molybdenum content is within the range of 0.75 to 2.75% and the nickel content is within the range of 3.00 to 4.75%.
Claim 13
Dependent Claim
35 words
The substantially fully ferritic stainless steel welded article of claim 7 wherein the molybdenum content is within the range of 2.00 to 3.50% and the nickel content is within the range of 3.00 to 4.75%.
Claim 14
Dependent Claim
30 words
The substantially fully ferritic stainless steel welded article of claim 7 wherein said welded article has an aswelded Olsen cup height exceeding 0.250 in. at a thickness of 0.060 in.
Claim 15
Dependent Claim
110 words
A substantially fully ferritic stainless steel welded article with excellent formability, notch toughness and high corrosion resistance, said welded article consisting essentially of, in weight percent, up to 0.04 carbon, up to 0.04 nitrogen, with the carbon plus nitrogen content being above 0.02 but below 0.07, up to 1.0 manganese, up to 1.0 silicon, 23.0 to less than 28.0 chromium, 2.00 to 4.75 nickel, 0.75 to 3.50 molybdenum, up to 0.30 titanium, up to 0.30 columbium, with the columbium and titanium contents being at least equal to the amounts given by the following equation: % Ti/6 + % Cb/8 = (%C + %N) and the balance iron and incidental impurities.
Claim 16
Dependent Claim
110 words
A substantially fully ferritic stainless steel welded article with excellent formability, notch toughness and high corrosion resistance, said welded article consisting essentially of, in weight percent, up to 0.04 carbon, up to 0.04 nitrogen, with the carbon plus nitrogen content being above 0.02 but below 0.07, up to 1.0 manganese, up to 1.0 silicon, 23.0 to less than 28.0 chromium, 2.00 to 4.75 nickel, 0.75 to 3.50 molybdenum, up to 0.30 titanium, up to 0.30 columbium, with the columbium and titanium contents being at least equal to the amounts given by the following equation: % Ti/6 + % Cb/8 = (%C + %N) and the balance iron and incidental impurities.
Claim 17
Dependent Claim
20 words
The fully ferritic stainless welded article of claim 13 wherein molybdenum content is within the range of 0.75 to 2.75%.
Claim 18
Dependent Claim
23 words
The substantially fully ferritic stainless steel welded article of claim 13 wherein the nickel content is within the range of 3.00 to 4.75%.
Claim 19
Dependent Claim
35 words
The substantially fully ferritic stainless steel welded article of claim 13 wherein the molybdenum content is within the range of 0.75 to 2.75% and the nickel content is within the range of 3.00 to 4.75%.
Claim 20
Dependent Claim
35 words
The substantially fully ferritic stainless steel welded article of claim 13 wherein the molybdenum content is within the range of 2.00 to 3.50% and the nickel content is within the range of 3.00 to 4.75%.
Claim 21
Dependent Claim
30 words
The substantially fully ferritic stainless steel welded article of claim 13 wherein said welded article has an aswelded Olsen cup height exceeding 0.250 in. at a thickness of 0.060 in.
Claim 22
Dependent Claim
90 words
A substantially fully ferritic stainless steel welded article with high corrosion resistance, said welded article consisting essentially of, in weight percent, 0.003 to below 0.04 carbon, 0.003 to below 0.04 nitrogen, the sum of the carbon and nitrogen content being 0.006 to below 0.04, up to 1.0 manganese, up to 1.0 silicon, 23.0 to less than 28.0 chromium, 1.00 to 4.75 nickel, 2.50 to 3.50 molybdenum, 0.05 to 0.70 columbium, with columbium being at least equal to eight times the carbon plus nitrogen, and the balance iron and incidental impurities.
Claim 23
Dependent Claim
90 words
A substantially fully ferritic stainless steel welded article with high corrosion resistance, said welded article consisting essentially of, in weight percent, 0.003 to below 0.04 carbon, 0.003 to below 0.04 nitrogen, the sum of the carbon and nitrogen content being 0.006 to below 0.04, up to 1.0 manganese, up to 1.0 silicon, 23.0 to less than 28.0 chromium, 1.00 to 4.75 nickel, 2.50 to 3.50 molybdenum, 0.05 to 0.70 columbium, with columbium being at least equal to eight times the carbon plus nitrogen, and the balance iron and incidental impurities.
Claim 24
Dependent Claim
30 words
The substantially fully ferritic stainless steel welded article of claim 19 wherein said welded article has an aswelded Olsen cup height exceeding 0.250 in. at a thickness of 0.060 in.
Claim 25
Dependent Claim
20 words
The substantially fully ferritic stainless steel welded article of claim 20 having molybdenum within the range of 3.00 to 3.50%.
Claim 26
Dependent Claim
20 words
The substantially fully ferritic stainless steel welded article of claim 20 having nickel within the range of 1.00 to 2.00%.
Claim 27
Dependent Claim
20 words
The substantially fully ferritic stainless steel welded article of claim 22 having molybdenum within the range of 3.00 to 3.50%.
Claim 28
Dependent Claim
89 words
A substantially fully ferritic stainless steel welded article with high corrosion resistance, said welded article consisting essentially of, in weight percent, up to 0.04 carbon, up to 0.04 nitrogen, the sum of the carbon plus nitrogen content being above 0.02 but below 0.07, up to 1.0 manganese, up to 1.0 silicon, 23.0 to less than 28.0 chromium, 1.00 to 4.75 nickel, 2.50 to 3.50 molybdenum, 0.12 to 0.70 titanium, with titanium being at least equal to six times the carbon plus nitrogen, and the balance iron and incidental impurities.
Claim 29
Dependent Claim
89 words
A substantially fully ferritic stainless steel welded article with high corrosion resistance, said welded article consisting essentially of, in weight percent, up to 0.04 carbon, up to 0.04 nitrogen, the sum of the carbon plus nitrogen content being above 0.02 but below 0.07, up to 1.0 manganese, up to 1.0 silicon, 23.0 to less than 28.0 chromium, 1.00 to 4.75 nickel, 2.50 to 3.50 molybdenum, 0.12 to 0.70 titanium, with titanium being at least equal to six times the carbon plus nitrogen, and the balance iron and incidental impurities.
Claim 30
Dependent Claim
30 words
The substantially fully ferritic stainless steel welded article of claim 24 wherein said welded article has an aswelded Olsen cup height exceeding 0.250 in. at a thickness of 0.060 in.
Claim 31
Dependent Claim
20 words
The substantially fully ferritic stainless steel welded article of claim 25 having molybdenum within the range of 3.00 to 3.50%.
Claim 32
Dependent Claim
20 words
The substantially fully ferritic stainless steel welded article of claim 25 having nickel within the range of 1.00 to 2.00%.
Claim 33
Dependent Claim
20 words
The substantially fully ferritic stainless steel welded article of claim 27 having molybdenum within the range of 3.00 to 3.50%.
Claim 34
Dependent Claim
105 words
A substantially fully ferritic stainless steel welded article with high corrosion resistance, said welded article consisting essentially of, in weight percent, up to 0.04 carbon, up to 0.04 nitrogen, with the carbon plus nitrogen content being above 0.02 but below 0.07, up to 1.0 manganese, up to 1.0 silicon, 23.0 to less than 28.0 chromium, 1.00 to 4.75 nickel, 2.50 to 3.50 molybdenum, up to 0.30 titanium, up to 0.30 columbium, with the columbium and titanium contents being at least equal to the amounts given by the following equation: % Ti/6 + % Cb/8 = (%C + %N) and the balance iron and incidental impurities.
Claim 35
Dependent Claim
105 words
A substantially fully ferritic stainless steel welded article with high corrosion resistance, said welded article consisting essentially of, in weight percent, up to 0.04 carbon, up to 0.04 nitrogen, with the carbon plus nitrogen content being above 0.02 but below 0.07, up to 1.0 manganese, up to 1.0 silicon, 23.0 to less than 28.0 chromium, 1.00 to 4.75 nickel, 2.50 to 3.50 molybdenum, up to 0.30 titanium, up to 0.30 columbium, with the columbium and titanium contents being at least equal to the amounts given by the following equation: % Ti/6 + % Cb/8 = (%C + %N) and the balance iron and incidental impurities.
Claim 36
Dependent Claim
30 words
The substantially fully ferritic stainless steel welded article of claim 29 wherein said welded article has an aswelded Olsen cup height exceeding 0.250 in. at a thickness of 0.060 in.
Claim 37
Dependent Claim
19 words
The fully ferritic stainless steel welded article of claim 30 having molybdenum within the range of 3.00 to 3.50%.
Claim 38
Dependent Claim
20 words
The substantially fully ferritic stainless steel welded article of claim 30 having nickel within the range of 1.00 to 2.00%.
Claim 39
Dependent Claim
20 words
The substantially fully ferritic stainless steel welded article of claim 32 having molybdenum within the range of 3.00 to 3.50%.
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) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |