US5292383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steel sheets for procelain enameling and method of producing the same
Assignee: JFE Steel Corp
•
Filing: 1991-12-17
•
Granted: 1994-03-08
•
Expires: 2011-12-17
Abstract
Abstract A steel sheet for porcelain enameling having improved press formability and enameling properties comprises particular amounts of C, Mn, B, Cu, Al, O, N, and P or further Ti and Nb and the balance being Fe and inevitable impurities and is produced by hot rolling a slab of steel having a chemical composition as mentioned above as a starting material, cold rolling the resulting hot rolled sheet at a reduction of not less than 70%, and then subjecting the resulting cold rolled sheet to a continuous annealing at a heating temperature of not lower than 800° C. but not higher than A c3 transformation point.
Inventors
- 👤 Kazunori Osawa
- 👤 Susumu Satoh
- 👤 Toshiyuki Kato
- 👤 Hideo Abe
- 👤 Keiji Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:27
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
68 words
A steel sheet for porcelain enameling having improved fishscale resistance and press formability, consisting essentially of not more than 0.0025 wt% of C, not more than 0.50 wt% of Mn, 0.007-0.020 wt% of B, 0.01-0.07 wt% of Cu, not more than 0.010 wt% of Al, 0.008-0.020 wt% of O, 0.005-0.020 wt% of N, not more than 0.020 wt% of P, and the balance being Fe and inevitable impurities.
Claim 2
Dependent Claim
68 words
A steel sheet for porcelain enameling having improved fishscale resistance and press formability, consisting essentially of not more than 0.0025 wt% of C, not more than 0.50 wt% of Mn, 0.007-0.020 wt% of B, 0.01-0.07 wt% of Cu, not more than 0.010 wt% of Al, 0.008-0.020 wt% of O, 0.005-0.020 wt% of N, not more than 0.020 wt% of P, and the balance being Fe and inevitable impurities.
Claim 3
Dependent Claim
98 words
A steel sheet for porcelain enameling having improved fishscale resistance and pressformability, consisting essentially of not more than 0.0050 wt% of C, not more than 0.50 wt% of Mn, 0.007-0.020 wt% of B, 0.01-0.07 wt% of Cu, not more than 0.010 wt% of Al, 0.008-0.020 wt% of O, 0.005-0.020 wt% of N, not more than 0.020 wt% of P, at least one of not more than 0.050 wt% of Ti and not more than 0.050 wt% of Nb provided that a total amount of Ti and Nb is 0.001-0.050 wt%, and the balance being Fe and inevitable impurities.
Claim 4
Dependent Claim
98 words
A steel sheet for porcelain enameling having improved fishscale resistance and pressformability, consisting essentially of not more than 0.0050 wt% of C, not more than 0.50 wt% of Mn, 0.007-0.020 wt% of B, 0.01-0.07 wt% of Cu, not more than 0.010 wt% of Al, 0.008-0.020 wt% of O, 0.005-0.020 wt% of N, not more than 0.020 wt% of P, at least one of not more than 0.050 wt% of Ti and not more than 0.050 wt% of Nb provided that a total amount of Ti and Nb is 0.001-0.050 wt%, and the balance being Fe and inevitable impurities.
Claim 5
Dependent Claim
16 words
The steel sheet according to claim 1, wherein said steel further contains 0.0001-0.100 wt% of Se.
Claim 6
Dependent Claim
16 words
The steel sheet according to claim 2, wherein said steel further contains 0.0001-0.100 wt% of Se.
Claim 7
Dependent Claim
24 words
The steel sheet defined in claim 4 wherein said steel sheet contains at least 0.001 wt% and not more than 0.010 wt% of Al.
Claim 8
Dependent Claim
24 words
The steel sheet defined in claim 1 wherein said steel sheet contains at least 0.001 wt% and not more than 0.010 wt% of Al.
Claim 9
Dependent Claim
24 words
The steel sheet defined in claim 2 wherein said steel sheet contains at least 0.001 wt% and not more than 0.010 wt% of Al.
References Cited (Backward Citations)
JPS59229463A
Cited
JPS61276958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-03-07 | 1997-09-06 | 1998-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-07 | 2001-09-06 | 2002-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-07 | 2005-09-06 | 2006-03-08 | $7700.00 | Window Closed / Lapsed |