US3785878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of metal rod or wire
Assignee: Centre de Recherches Metallurgiques CRM ASBL
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Filing: 1970-08-18
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Granted: 1974-01-15
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Expires: 1990-08-18
Abstract
Abstract The process is particularly applicable to steel rod or wire. Metal rod or wire is cooled from a temperature at which the metal is in a first stable phase to a temperature at which the metal is in a second stable phase. Part of the cooling is by means of a liquid consisting of an aqueous fluid containing, in suspension and/or solution, one or more substances which modify the heat transfer conditions of the aqueous fluid. The liquid is at a temperature greater than 80* C and above 75 percent of its boiling temperature expressed in degrees centigrade. The heat transfer conditions of the liquid and the duration of cooling by means of the liquid are such that all, or the major part, of the optimum allotropic transformation of the metal takes place during cooling by means of the liquid.
Inventors
- 👤 M Economopoulos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:20
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D9/525; B; B21; B21B; B21B45/00; B21B45/02; B21B45/0203; B21B45/0209; B21B45/0215; B21B45/0224; B21C; B21C9/00; C21D1/00; C21D1/56; C21D1/60; C23; C23G; C23G1/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
14 words
A process as claimed in claim 1, wherein the solution or suspension is boiling.
Claim 2
Dependent Claim
27 words
A process as claimed in claim 1 further comprising in connection with said salt a non-ionic surface-active agent obtained by condensation of ethylene oxide with an alkylphenol.
Claim 3
Dependent Claim
26 words
A process as claimed in claim 1, wherein the water contains at least one substance facilitating heat transfer from the rod or wire through the water.
Claim 4
Dependent Claim
23 words
A process as claimed in claim 1, wherein the water contains at least one substance which causes de-scaling of the rod or wire.
Claim 5
Dependent Claim
23 words
A process as claimed in claim 1, wherein the water contains at least one substance which causes passivation of the rod or wire.
Claim 6
Dependent Claim
62 words
A process as claimed in claim 1, wherein the step of cooling the rod or wire by means of a solution or suspension comprises the steps in sequence of cooling the rod or wire by means of an aqueous solution of at least one salt, and cooling the rod or wire by an aqueous fluid containing at least one surface active agent.
Claim 7
Dependent Claim
65 words
A process as claimed in claim 1, wherein the rod or wire is steel rod leaving the last stand of a hot-rolling mill, the process further comprising, prior to cooling by mans of the solution or suspension, the steps of cooling the rod to a skin temperature of 500* to 900* C, and air cooling the rod, whereby the temperature of the rod is homogenized.
Claim 8
Dependent Claim
29 words
A process as claimed in claim 8, wherein the temperature of the rod immediately after cooling by means of the solution or suspension, is between 500* and 550* C.
Claim 9
Dependent Claim
30 words
A process as claimed in claim 1, wherein the step of cooling by means of the solution or suspension includes immersing the rod or wire in the solution or suspension.
Claim 10
Dependent Claim
31 words
A process as claimed in claim 10, including the step of setting up an electric field around the rod or wire to control the cooling capacity of the solution or suspension.
Claim 11
Dependent Claim
23 words
A process as claimed in claim 10, wherein the water contains at least one substance permitting electrolytic de-scaling of the rod or wire.
Claim 12
Dependent Claim
28 words
A process as claimed in claim 1, wherein the step of cooling by means of the solution or suspension includes spraying it on to the rod or wire.
Claim 13
Dependent Claim
18 words
A process as claimed in claim 1, further comprising treating the rod or wire to inhibit surface oxidation.
Claim 14
Dependent Claim
28 words
A process as claimed in claim 1, wherein the rod or wire is in loose turns throughout the step of cooling by means of the solution or suspension.
Claim 15
Dependent Claim
11 words
The process of claim 1 wherein the salt is calcium chloride.
Claim 16
Dependent Claim
31 words
The process of claim 16 wherein the solution or suspension contains 80 weight percent of calcium chloride and 20 weight percent of water at a temperature of 160* to 165* C.
Claim 17
Dependent Claim
31 words
The process of claim 8 wherein the solution or suspension contains 80 weight percent of calcium chloride and 20 weight percent of water at a temperature of 160* to 165* C.
Claim 18
Dependent Claim
28 words
A process as claimed in claim 1 wherein the solution or suspension is a saturated aqueous solution of NaC1 and KC1 at a temperature of about 112* C.
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 |