US3839100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low nickel high-strength silicon steel
Assignee: Individual
•
Filing: 1973-04-16
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Granted: 1974-10-01
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Expires: 1993-04-16
Abstract
Abstract A low nickel high-strength silicon alloy steel age hardened for 8 hours at 750*F to a Vickers Brinell Hardness of 600, said alloy steel consisting essentially of C in an amount of not more than 0.03 percent, 4-6% Si, 1-5% Mn, 1.8-4.8% Ni, 6-18% Cr, 1-4% Cu, optionally one or more of Mo, V and B in an amount of not more than 2 percent each, and the residual essentially Fe, in which the weight ratio of the total amount of Ni, Mn and Cu to Si and the weight ratio of Cr to Si are varied about 2.5 and 3 respectively, wherein the Ac3 transformation point of said steel is less than 1,210*F.
Inventors
- 👤 K Ota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:38
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A LOW NICKEL HIGH-STRENGTH SILICON ALLOY STEEL AGEN HARDENED FOR 8 HOURS AT 750*F. TO A VICHERS BRINELL HARDNESS OF 600, SAID ALLOY STEEL CONSISTING ESSENTIALLY OF C IN AN AMOUNT OF NOT MORE THAN 0.03 PERCENT, 4-6%SI, 1-5% MN, 1.8-4.8% NI, 6-18%CR, 1-4% CU, OPTIONALLY ONE OR MORE OF MO, V AND B IN AN AMOUNT OF NOT MORE THAN 2 PERCENT EACH, AND THE RESIDUAL ESSENTIALLY FE, IN WHICH THE WEIGHT RATIO OF THE TOTAL AMLOUNT OF NI, MN AND CU TO SI AND THE WEIGHT RATIO OF CR TO SI ARE VARIED 2.5 AND 3 RESPECTIVELY, AND WHEREIN THE AC3 TRANSFORMATION POINT OF SAID STEEL IS LESS THAN 1,400*F.
Claim 2
Dependent Claim
112 words
A LOW NICKEL HIGH-STRENGTH SILICON ALLOY STEEL AGEN HARDENED FOR 8 HOURS AT 750*F. TO A VICHERS BRINELL HARDNESS OF 600, SAID ALLOY STEEL CONSISTING ESSENTIALLY OF C IN AN AMOUNT OF NOT MORE THAN 0.03 PERCENT, 4-6%SI, 1-5% MN, 1.8-4.8% NI, 6-18%CR, 1-4% CU, OPTIONALLY ONE OR MORE OF MO, V AND B IN AN AMOUNT OF NOT MORE THAN 2 PERCENT EACH, AND THE RESIDUAL ESSENTIALLY FE, IN WHICH THE WEIGHT RATIO OF THE TOTAL AMLOUNT OF NI, MN AND CU TO SI AND THE WEIGHT RATIO OF CR TO SI ARE VARIED 2.5 AND 3 RESPECTIVELY, AND WHEREIN THE AC3 TRANSFORMATION POINT OF SAID STEEL IS LESS THAN 1,400*F.
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |