Claims
- 1. A process for producing deep-drawing cold rolled steel strips, comprising:
- hot rolling a steel consisting essentially of 0.0014-0.0031% carbon, 0.010-0.100% aluminum and titanium in amounts not less than 4 times the carbon content, but within a range of from 0.019-0.052%, 0.0019-0.0038% nitrogen with the balance being iron and unavoidable impurities;
- coiling the hot rolled strip thus obtained at a temperature not lower than 700.degree. C.; and
- subjecting the coiled strip to cold rolling and then continuous annealing including a soaking step in a temperature range of from 700.degree. to 900.degree. C. for 20 seconds to 2 minutes.
- 2. A process according to claim 1 in which the cold rolling is done with a reduction ranging from 70 to 85%.
- 3. A process according to claim 1 in which the coiling of the hot rolled steel strip is done at an ordinary temperature and the strip thus coiled is reheated to a temperature not lower than 700.degree. C. in a separate line.
- 4. A process according to claim 1 wherein the titanium is not less than 6.3 times the carbon content.
- 5. A process according to claim 4 wherein the titanium is 6.3 to 37.1 times the carbon content.
Priority Claims (1)
Number |
Date |
Country |
Kind |
56-147592 |
Sep 1981 |
JPX |
|
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of our copending application Ser. No. 418,544 filed Sept. 15, 1982, now abandoned.
US Referenced Citations (3)
Foreign Referenced Citations (9)
Number |
Date |
Country |
2603097 |
Jul 1976 |
DEX |
2480311 |
Oct 1981 |
FRX |
137021 |
Nov 1978 |
JPX |
104417 |
Aug 1979 |
JPX |
24952 |
Feb 1980 |
JPX |
107732 |
Aug 1980 |
JPX |
3656 |
Jan 1981 |
JPX |
62926 |
May 1981 |
JPX |
69358 |
Jun 1981 |
JPX |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
418544 |
Sep 1982 |
|