Patent US3953252A successfully refreshed from Google Patents.
US3953252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing metal articles having magnetic and non-magnetic areas
Assignee: Individual
•
Filing: 1974-10-17
•
Granted: 1976-04-27
•
Expires: 1994-10-17
Abstract
Abstract A method of manufacturing metal articles having magnetic and non-magnetic areas comprises the thermal treatment of an all-metal blank made of a metal capable of forming a non-magnetic structure as a result of ageing and of becoming magnetic after high-temperature hardening. The areas intended to form the non-magnetic structure are heated to a temperature ranging from 450° to 1000°C, soaked to form the non-magnetic structure and then cooled, while the areas intended to form the magnetic structure are heated to a temperature ranging from 1000°C to the melting temperature of the metal to preserve the uniformity of the blank, and then cooled at a rate preventing the formation of the non-magnetic structure.
Inventors
- 👤 Felix Lvovich Levin
- 👤 Sergei Alexandrovich Golovanenko
- 👤 Vladimir Alexandrovich Dmitriev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:32
CPC Classifications
H; H01; H01F; H01F3/00; H01F3/10; C; C21; C21D; C21D6/00; C21D6/002; H01F1/00; H01F1/01; H01F1/03; H01F1/0302; H01F1/0306; C21D2221/00; Y; Y10; Y10S; Y10S148/00; Y10S148/902
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
128 words
A method of manufacturing an integral steel article having magnetic and non-magnetic areas comprising the steps of: selecting a steel article comprising, by weight, not more than 0.1% carbon, 7-12% manganese, 11-30% chromium and the balance being iron; heating areas of the steel article intended to form a non-magnetic structure to a temperature of from 450°-1000° C; soaking the areas; and cooling the areas to form a non-magnetic structure in the areas; heating areas of the steel article intended to form a magnetic structure to a temperature of from 1000° C to the melting point of the steel; soaking the areas to form a magnetic structure in the areas; and cooling the areas having the magnetic structure at a rate to prevent the formation of the non-magnetic structure.
Claim 2
Independent Claim
128 words
A method of manufacturing an integral steel article having magnetic and non-magnetic areas comprising the steps of: selecting a steel article comprising, by weight, not more than 0.1% carbon, 7-12% manganese, 11-30% chromium and the balance being iron; heating areas of the steel article intended to form a non-magnetic structure to a temperature of from 450°-1000° C; soaking the areas; and cooling the areas to form a non-magnetic structure in the areas; heating areas of the steel article intended to form a magnetic structure to a temperature of from 1000° C to the melting point of the steel; soaking the areas to form a magnetic structure in the areas; and cooling the areas having the magnetic structure at a rate to prevent the formation of the non-magnetic structure.
Claim 3
Dependent Claim
47 words
The method as claimed in claim 1 further comprising the steps of: preheating the areas of the steel article intended to form the magnetic structure to a temperature of from 1050°-1350° C; soaking the areas until the temperature is equalized throughout the areas; and cooling the areas.
Claim 4
Dependent Claim
17 words
The method as claimed in claim 1 wherein the steel article further comprises 3-5 weight % nickel.
Claim 5
Dependent Claim
29 words
The method as claimed in claim 1 wherein the steel article further comprises 1-5 weight % of a metal selected from the group consisting of molybdenum, tungsten and niobium.
Claim 6
Dependent Claim
17 words
The method as claimed in claim 1 wherein the steel article further comprises 1 weight % titanium.
Claim 7
Dependent Claim
29 words
The method as claimed in claim 1 wherein the steel article consists essentially of, by weight, 0.05% carbon, 0.30% silicon, 11.04% manganese, 26.67% chromium and the balance being iron.
Claim 8
Dependent Claim
35 words
The method as claimed in claim 3 wherein the steel article consists essentially of, by weight, 0.07% carbon, 0.35% silicon, 10.5% silicon, 10.5% manganese, 18.91% chromium, 4.36% nickel, 2.10% vanadium and the balance being iron.
Claim 9
Dependent Claim
33 words
The method as claimed in claim 3 wherein the steel article consists essentially of, by weight, 0.05% carbon, 6.58% manganese, 0.45% silicon, 25.83% chromium, 4.30% nickel, 0.76% titanium and the balance being iron.
Claim 10
Dependent Claim
35 words
The method as claimed in claim 3 wherein the steel article consists essentially of, by weight, 0.035% carbon, 6.50% manganese, 0.47% silicon, 13.83% chromium, 4.30% nickel, 0.52% titanium, 3.87% niobium and the balance being iron.
Claim 11
Dependent Claim
35 words
The method as claimed in claim 3 wherein the steel article consists essentially of, by weight, 0.018% carbon, 6.35% manganese, 0.37% silicon, 13.56% chromium, 4.43% nickel, 0.82% titanium, 4.02% tungsten and the balance being iron.
Claim 12
Dependent Claim
31 words
The method as claimed in claim 3 wherein the steel article consists essentially of, by weight, 0.045% carbon, 0.35% silicon, 11.00% manganese, 19.29% chromium, 4.20% nickel and the balance being iron.
Claim 13
Dependent Claim
20 words
The method as claimed in claim 1 wherein the areas having the magnetic structure are cooled in a magnetic field.
References Cited (Backward Citations)
US2002689A
Cited
US2382651A
Cited
US2765161A
Cited
US3047382A
Cited
US3707001A
Cited
US3736131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |