US3844848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of low alloy steel wire
Assignee: Bridon Ropes Ltd
•
Filing: 1973-11-15
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Granted: 1974-10-29
•
Expires: 1993-11-15
Abstract
Abstract Low alloy steel rod is given a pearlite structure and is then cold-drawn to initiate work hardening. The rod is then drawn through a die producing a reduction in area of between 10 and 40 percent. The wire leaving the die is heated to 300*-450*C and then forcibly cooled.
Inventors
- 👤 A Stacey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:14
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/50; C21; C21D; C21D8/00; C21D8/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
71 words
A METHOD OF PRODUCING LOW ALLOY STEEL WIRE FROM LOW ALLOY STEEL ROD, THE METHOD COMPRISING HEAT TREATING THE ROD TO PRODUCE A PEARLITE STRUCTURE, COLD DRAWING THE ROD TO INITIATE WORK HARDENING AND THEVEBY RAISE THE TENSILE STRENGTH; DRAWING THE PART-DRAWN ROD THROUGH A DRAWING DIE TO REDUCE THE CORSSSECTIONAL AREA BY BETWEEN 10 AND 40 PERCENT; HEATING THE WIRE LEAVING THE DIE TO 300*-450=C; AND FORCIBLY COOLING THE WIRE.
Claim 2
Independent Claim
71 words
A METHOD OF PRODUCING LOW ALLOY STEEL WIRE FROM LOW ALLOY STEEL ROD, THE METHOD COMPRISING HEAT TREATING THE ROD TO PRODUCE A PEARLITE STRUCTURE, COLD DRAWING THE ROD TO INITIATE WORK HARDENING AND THEVEBY RAISE THE TENSILE STRENGTH; DRAWING THE PART-DRAWN ROD THROUGH A DRAWING DIE TO REDUCE THE CORSSSECTIONAL AREA BY BETWEEN 10 AND 40 PERCENT; HEATING THE WIRE LEAVING THE DIE TO 300*-450=C; AND FORCIBLY COOLING THE WIRE.
Claim 3
Dependent Claim
39 words
A method as claimed in claim 1, in which the heat treatment to produce a pearlite structure comprises heating above the AC3 point, cooling to and holding at a temperature between 550* and 700*C, and then cooling in air.
Claim 4
Dependent Claim
18 words
A method as claimed in claim 2, in which the holding temperature between 500* and 700*C is 650*C.
Claim 5
Dependent Claim
26 words
A method as claimed in claim 1, in which the heat treatment to produce a pearlite structure is carried out on rod leaving a rolling mill.
Claim 6
Dependent Claim
72 words
A method as claimed in claim 1, in which the low alloy steel of which the rod is made contains, by weight: C 0.30-1.00 percent, and alloying elements selected from the following elements in the following ranges: Mn 0.20-1.50%, Si 0.10-4.00%, Cr 0.10-4.00%, S 0.050% maximum, P 0.050% maximum, Mo 0.10-2.00%, Cu 0.10-3.00%, Ni 0.10-5.00%, Ti 0.10-2.00, V 2.00% maximum, N 0.50% maximum, and Nb 0.10-3.00%, the balance being Fe and impurities.
References Cited (Backward Citations)
US2756169A
Cited
US3011928A
Cited
US3574000A
Cited
US3584494A
Cited
US3645805A
Cited
US3711338A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |