US3873374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and compositions for the prevention or reduction of speck rusting of cold rolled, annealed steel prior to temper rolling
Assignee: Armco Inc
•
Filing: 1973-06-20
•
Granted: 1975-03-25
•
Expires: 1993-06-20
Abstract
Abstract A method and composition for the prevention or reduction of speck rusting of cold rolled, annealed steel prior to temper rolling wherein phosphoric acid or the ammonium hydroxide neutralization products of phosphoric acid are added to the rolling emulsions used during the cold rolling step. The invention contemplates the use of conventional oil-water cold rolling emulsions to which the above noted additions are made in an amount of from about 200 to about 500 ppm as PO4.
Inventors
- 👤 Juri Kolts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:52
CPC Classifications
C; C10; C10M; C10M173/00; C10M2201/00; C10M2201/02; C10M2201/085; C10M2207/00; C10M2207/40; C10M2207/404; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/042; C10N; C10N2030/00; C10N2030/12; C10N2040/00; C10N2040/20; C10N2040/24; C10N2040/241; C10N2040/242; C10N2040/243; C10N2040/244; C10N2040/245; C10N2040/246; C10N2040/247; C10N2050/00; C10N2050/01
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
117 words
IN A PROCESS FOR MAKING COLD ROLLED STEEL COMPRISING THE STEPS OF HOT BAND, PICKING RINSING, COLD ROLLING TO FINAL GAUGE, AMEALING, AND TEMPER ROLLING, THE IMPROVEMENT COMPRISING THE STEPS OF PROVIDING A CONVENTIONAL OIL-WATER ROLLING EMULSION FOR SAID STEEL DURING SAID COLO ROLLING STEP, ADDING TO SAID EMULSION AT LEAST ONE MATERIAL CHOSEN FROM THE CLASS CONSISTING OF NH4H2PO4, (NH4)2 H PO4, (NH4)3 PO4 AND MIXTURES OF H3PO4 AND NH4OH TO SAID EMULSION IN AN AMOUNT OF FROM ABOUT 200 TO ABOUT 500 PPM AS PO4 AND MAINTAINING THE PH OF SAID EMULSION CONTAINING SAID ADDITION ABOVE ABOUT 4.5 WHEREBY TO PREVENT THE FORMATION OF SPECK RUST ON SAID STEEL PRIOR TO SAID TEMPER ROLLING STEP.
Claim 2
Dependent Claim
117 words
IN A PROCESS FOR MAKING COLD ROLLED STEEL COMPRISING THE STEPS OF HOT BAND, PICKING RINSING, COLD ROLLING TO FINAL GAUGE, AMEALING, AND TEMPER ROLLING, THE IMPROVEMENT COMPRISING THE STEPS OF PROVIDING A CONVENTIONAL OIL-WATER ROLLING EMULSION FOR SAID STEEL DURING SAID COLO ROLLING STEP, ADDING TO SAID EMULSION AT LEAST ONE MATERIAL CHOSEN FROM THE CLASS CONSISTING OF NH4H2PO4, (NH4)2 H PO4, (NH4)3 PO4 AND MIXTURES OF H3PO4 AND NH4OH TO SAID EMULSION IN AN AMOUNT OF FROM ABOUT 200 TO ABOUT 500 PPM AS PO4 AND MAINTAINING THE PH OF SAID EMULSION CONTAINING SAID ADDITION ABOVE ABOUT 4.5 WHEREBY TO PREVENT THE FORMATION OF SPECK RUST ON SAID STEEL PRIOR TO SAID TEMPER ROLLING STEP.
Claim 3
Dependent Claim
27 words
The process claimed in claim 1 wherein said pH of said emulsion containing said addition is maintained within the range of from about 5.5 to about 8.0.
Claim 4
Dependent Claim
28 words
The process claimed in claim 1 wherein said material aDded to said emulsion is added in an amount of from about 250 to about 450 ppm as PO4.
Claim 5
Dependent Claim
25 words
The process claimed in claim 1 wherein said material added to said emulsion is chosen from the class consisting of NH4H2PO4, (NH4)2HPO4 and mixtures thereof.
Claim 6
Dependent Claim
28 words
The process claimed in claim 4 wherein said material added to said emulsion is added in an amount of from about 250 to about 450 ppm as PO4.
Claim 7
Dependent Claim
54 words
A cold rolling emulsion for use in cold rolling steel comprising a conventional oil-water emulsion and from about 200 to about 500 ppm of at least one material chosen from the class consisting of NH4H2PO4, (NH4)2 HPO4, (NH4)3PO4 and mixtures of H3PO4 and NH4OH said cold rolling emulsion having a pH above about 4.5.
Claim 8
Dependent Claim
54 words
A cold rolling emulsion for use in cold rolling steel comprising a conventional oil-water emulsion and from about 200 to about 500 ppm of at least one material chosen from the class consisting of NH4H2PO4, (NH4)2 HPO4, (NH4)3PO4 and mixtures of H3PO4 and NH4OH said cold rolling emulsion having a pH above about 4.5.
Claim 9
Dependent Claim
20 words
The cold rolling emulsion of claim 6 having a pH within the range of from about 5.5 to about 8.0.
Claim 10
Dependent Claim
23 words
The cold rolling emulsion of claim 6 wherein said material is present in an amount of from about 250 to about 450 ppm.
Claim 11
Dependent Claim
22 words
The cold rolling emulsion of claim 6 wherein said material is chosen from the class consisting of NH4H2PO4, (NH4)2HPO4 and mixtures thereof.
Claim 12
Dependent Claim
23 words
The cold rolling emulsion of claim 9 wherein said material is present in an amount of from about 250 to about 450 ppm.
References Cited (Backward Citations)
US2430400A
Cited
US3203895A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |