Claims
- 1. A high strength low carbon steel wire rod having excellent cold drawing properties and having a composite structure containing an acicular low temperature transformation phase comprising a martensite structure, a bainite structure or a combination thereof and a finely dispersed ferrite phase, which consists essentially of:
- from 0.02-0.30% by weight carbon, less than 2.5% by weight silicon, less than 2.5% by weight manganese, with the balance being iron and inevitable impurities, said ferrite phase partially containing uniformly dispersed retained austenite therein in a volume ratio of from 10-70%, and the weight of (C+N) in solution in the ferrite phase being less than 40 ppm.
- 2. The wire rod of claim 1, wherein the structure comprises: less than 0.01% by weight aluminum, less than 0.01% by weight phosphorus, less than 0.005% by weight sulfur, less than 0.004% by weight nitrogen, said structure having a Si/Al ratio of less than 400 and a Si/Mn ratio of less than 0.7.
Priority Claims (4)
Number |
Date |
Country |
Kind |
60-191024 |
Aug 1985 |
JPX |
|
60-191026 |
Aug 1985 |
JPX |
|
60-249559 |
Nov 1985 |
JPX |
|
60-249560 |
Nov 1985 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/235,797, filed on Aug. 23, 1988, now abandoned, which is a continuation of Ser. No. 06/895,869, filed Aug. 12, 1986, which is now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (8)
Number |
Date |
Country |
0008201 |
Feb 1980 |
EPX |
0152160 |
Aug 1985 |
EPX |
2811038 |
Oct 1978 |
DEX |
2856325 |
Jul 1979 |
DEX |
55-46447 |
Nov 1980 |
JPX |
184664 |
Sep 1985 |
JPX |
153260 |
Jul 1986 |
JPX |
8402354 |
Jun 1984 |
WOX |
Non-Patent Literature Citations (3)
Entry |
Journal of the Iron & Steel Institute of Japan, (I) [vol. 68, No. 9, pp. 1147-1159] (II) [vol. 70 No. 2 pp. 246-253]. |
Kawasaki Steel Technical Report [vol. 11, No. 1, 1979], pp. 68-77. |
Metallurgical Transaction Aug. 1982, (I) [vol. 16A No. 5, pp. 831-840] (II) [vol. 13A No. 8 pp. 1379-1388]. |
Continuations (2)
|
Number |
Date |
Country |
Parent |
235797 |
Aug 1988 |
|
Parent |
895869 |
Aug 1986 |
|