US3785787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stainless steel with high resistance against corrosion and welding cracks
Assignee: Nippon Yakin Kogyo Co Ltd
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Filing: 1972-10-06
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Granted: 1974-01-15
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Expires: 1992-10-06
Abstract
Abstract Stainless steel with high resistance against corrosion and welding cracks, consisting of carbon, silicon, manganese, nickel, chromium, copper and the remainder of iron with an inevitable amount of impurity. The contents of the aforesaid ingredient elements of the stainless steel are so related with each other that the value of the following austenite/ferrite ratio is kept equal to or less than 1.06. The stainless steel may contain a limited amount of molybdenum, niobium, titanium, and tantalum, with a modified austenite/ferrite ratio. The stainless steel is advantageously used to make heat exchangers in processes employing automatic tungsten inert gas arc welding techniques.
Inventors
- 👤 K Yokota
- 👤 Y Fukase
- 👤 K Osozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:28
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/42; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12639; Y10T428/12646; Y10T428/12653; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12972; Y10T428/12979
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
95 words
A heat exchanger according to claim 1 wherein the stainless steel of said portion consists essentially of 0.01 to 0.1 percent by weight carbon (C), 2 to 6 percent by weight silicon (Si), 0.01 to 3 percent by weight manganese (Mn), 7 to 20 percent by weight nickel (Ni), 13 to 25 percent by weight chromium (Cr), 0.5 to 5 percent by weight copper (Cu), up to 0.1 percent by weight molybdenum (Mo), and the remainder iron with an inevitable amount of impurity, the contents of the elements in the stainless steel satisfying the relationship
Claim 2
Dependent Claim
102 words
A heat exchanger according to claim 1 wherein the stainless steel of said portion consists essentially of in percent by weight, 0.01 to 0.1 percent carbon (C), 2 to 6 percent silicon (Si), 0.01 to 3 percent manganese (Mn), 7 to 20 percent nickel (Ni), 13 to 25 percent chromium (Cr), 0.5 to 5 percent copper (Cu), 0.03 to 2.00 percent of at least one element selected from the group consisting of niobium (Nb), tantalum (Ta), and titanium (Ti), and the remainder of iron with an inevitable amount of impurity, the contents of the elements in the stainless steel satisfying the relationship
Claim 3
Dependent Claim
108 words
A heat exchanger according to claim 1 wherein the stainless steel of said portion consists essentiaLly of in percent by weight, 0.01 to 0.1 percent carbon (C), 2 to 6 percent silicon (Si), 0.01 to 3 percent manganese (Mn), 7 to 20 percent nickel (Ni), 13 to 25 percent chromium (Cr), 0.5 to 5 percent copper (Cu), up to 0.1 percent molybdenum (Mo), 0.03 to 2.00 percent of at least one element selected from the group consisting of niobium (Nb), tantalum (Ta), and titanium (Ti), and the remainder of iron with an inevitable amount of impurity, said contents of the elements in the stainless steel satisfying the relationship
Claim 4
Dependent Claim
93 words
An article manufacture having a welded joint therein joining two edges of material together, said welding joint produced by subjecting said two edges of continuous inert gas arc welding with nonconsumable tungsten electrodes, said edges composed of a stainless steel each independently consisting essentially of by weight, 0.01 to 0.1 percent carbon, 2 to 6 percent silicon, 0.01 to 3 percent manganese, 7 to 20 percent nickel, 13 to 25 percent chromium, 0.5 to 5 percent copper and the remainder iron, the contents of the elements in the stainless steel satisfying the relationship
Claim 5
Dependent Claim
94 words
The article of manufacture of claim 5 wherein said stainless steel consists essentially of by weight 0.01 to 0.1 percent by weight carbon (C), 2 to 6 percent by weight silicon (Si), 0.01 to 3 percent by weight manganese (Mn), 7 to 20 percent by weight nickel (Ni), 13 to 25 percent by weight chromium (Cr), 0.5 to 5 percent by weight copper (Cu), up to 0.1 percent by weight molybdenum (Mo), and the remainder iron with an inevitable amount of impurity, the contents of the elements in the stainless steel satisfying the relationship
Claim 6
Dependent Claim
98 words
The article of manufacture of claim 5 wherein said stainless steel consists essentially in percent by weight 0.01 to 0.1 percent carbon (C), 2 to 6 percent silicon (Si), 0.01 to 3 percent manganese (Mn), 7 to 20 percent nickel (Ni), 13 to 25 percent chromium (Cr), 0.5 to 5 percent copper (Cu), 0.03 to 2.00 percent of at least one element selected from the group consisting of niobium (Nb), tantalum (Ta), and titanium (Ti), and the remainder of iron with an inevitable amount of impurity, the contents of the elements in the stainless steel satisfying the relationship
Claim 7
Dependent Claim
105 words
The article of manufacture of claim 5 wherein said stainless steel consists essentially in percent by weight 0.01 to 0.1 percent carbon (C), 2 to 6 percent of silicon (Si), 0.01 to 3 percent manganese (Mn), 7 to 20 percent nickel (Ni), 13 to 25 percent chromium (Cr), 0.5 to 5 percent copper (Cu), up to 0.1 percent molybdenum (Mo), 0.03 to 2.00 percent of at least one element selected from the group consisting of niobium (Nb), tantalum (Ta), and titanium (Ti), and the remainder of iron with an inevitable amount of impurity, said contents of the elements in the stainless steel satisfying the relationship
Claim 8
Dependent Claim
123 words
A process for forming a welded article having high resistance against (a) general corrosion, (b) stress corrosion cracks and (c) welding bead cracks comprising causing two edges of one or more pieces of stainless steel to come together in welding relationship and welding the edges together by continuous inert gas arc welding with nonconsumable tungsten electrodes, said process characterized in that said stainless steel consists essentially of 0.01 to 0.1 percent by weight carbon, 2 to 6 percent by weight silicon, 0.01 to 3 percent by weight manganese, 7 to 20 percent by weight nickel, 13 to 25 percent bY weight chromium, 0.5 to 5 percent copper and the remainder iron, the contents of the elements in the stainless steel satisfying the relationship
Claim 9
Dependent Claim
12 words
A process according to claim 9 wherein said inert gas is argon.
Claim 10
Dependent Claim
84 words
Stainless steel having high resistance against stress corrosion cracks and against welding cracks, essentially consisting of, in percent by weight, 0.01 to 0.1 percent of carbon 2 to 6 percent of silicon (Si), 0.01 to 3 percent of manganese (Mn), 7 to 20 percent of nickel (Ni), 13 to 25 percent of chromium (Cr), 0.5 to 5 percent copper (Cu), and the remainder of iron with an inevitable amount of impurity, said contents of the elements in the stainless steel satisfying the relation of
Claim 11
Dependent Claim
24 words
The stainless steel of claim 11 further comprising up to 0.1% molybdenum, the contents of the elements in said stainless steel satisfying the relationship
Claim 12
Dependent Claim
41 words
The stainless steel of claim 11 further comprising 0.03 to 2.00% of at least one element selected from the group consisting of niobium (Nb), tantalum (Ta), and titanium (Ti), the contents of the elements in said stainless steel satisfying the relationship
Claim 13
Dependent Claim
25 words
The stainless steel of claim 13 further comprising up to 0.1% molybdenum (Mo), the contents of the elements in said stainless steel satisfying the relationship
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |