US4042423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for providing strong wire and strip
Assignee: Union Carbide Industrial Gases Technology Corp
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Filing: 1975-12-03
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Granted: 1977-08-16
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Expires: 1995-12-03
Abstract
Abstract A method for improving the strength of wire or strip having a composition which consists essentially of an austenitic metal alloy selected from the group consisting of stainless steel alloys of the AISI 200 and 300 series and non-stainless steel alloys containing iron, manganese, chromium, and carbon, said alloy having an Md temperature of no higher than about 100 DEG C and an Ms temperature of no higher than about minus 100 DEG C comprising the following step:
Inventors
- 👤 Jaak Stefaan Van den Sype
- 👤 William Alphonse Kilinskas
- 👤 Richard Benedict Mazzarella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:05
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/02; C21D8/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
136 words
A process for improving the strength characteristics of wire or strip having a composition consisting essentially of an austenitic metal alloy selected from the group consisting of stainless steel alloys of the AISI 200 and 300 series and non-stainless steel alloys containing iron, manganese, chromium, and carbon, said alloy having an Md temperature of no higher than about 100° C and an Ms temperature of no higher than about minus 100° C comprising the following step: a. stretching the wire or strip uniaxially at a strain of at least about 10 percent and at a temperature no higher than about minus 75° C in such a manner that the wire or strip has a martensite phase of at least about 50 percent by volume and an austenite phase of at least about 10 percent by volume.
Claim 2
Dependent Claim
136 words
A process for improving the strength characteristics of wire or strip having a composition consisting essentially of an austenitic metal alloy selected from the group consisting of stainless steel alloys of the AISI 200 and 300 series and non-stainless steel alloys containing iron, manganese, chromium, and carbon, said alloy having an Md temperature of no higher than about 100° C and an Ms temperature of no higher than about minus 100° C comprising the following step: a. stretching the wire or strip uniaxially at a strain of at least about 10 percent and at a temperature no higher than about minus 75° C in such a manner that the wire or strip has a martensite phase of at least about 50 percent by volume and an austenite phase of at least about 10 percent by volume.
Claim 3
Dependent Claim
33 words
The process defined in claim 1 comprising the following additional step: b. ageing the material produced in step (a) at a temperature in the range of about 350° C to about 450° C.
Claim 4
Dependent Claim
60 words
The process defined in claim 2 wherein, in step (a), the strain is about 10 to about 60 percent and the temperature is less than about minus 100° C, and the product of said step (a) has a martensite phase of at least about 60 percent by volume and an austenite phase of at least about 10 percent by volume.
Claim 5
Dependent Claim
26 words
The process defined in claim 3 wherein step b. is carried out at a temperature in the range of about 375° C to about 425° C.
Claim 6
Dependent Claim
19 words
The process defined in claim 1 wherein the material is a stainless steel alloy of the AISI 300 series.
Claim 7
Dependent Claim
19 words
The process defined in claim 2 wherein the material is a stainless steel alloy of the AISI 300 series.
Claim 8
Dependent Claim
19 words
The process defined in claim 3 wherein the material is a stainless steel alloy of the AISI 300 series.
Claim 9
Dependent Claim
19 words
The process defined in claim 4 wherein the material is a stainless steel alloy of the AISI 300 series.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |