US3178318A - Process for producing nonageing super deep-drawing steel sheets - Google Patents
Process for producing nonageing super deep-drawing steel sheets Download PDFInfo
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- US3178318A US3178318A US232288A US23228862A US3178318A US 3178318 A US3178318 A US 3178318A US 232288 A US232288 A US 232288A US 23228862 A US23228862 A US 23228862A US 3178318 A US3178318 A US 3178318A
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- United States
- Prior art keywords
- steel
- nonageing
- producing
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- steel sheets
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- Expired - Lifetime
Links
- 229910000831 Steel Inorganic materials 0.000 title description 39
- 239000010959 steel Substances 0.000 title description 39
- 238000000034 method Methods 0.000 title description 10
- 229910052799 carbon Inorganic materials 0.000 description 11
- 229910000655 Killed steel Inorganic materials 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 229910001327 Rimmed steel Inorganic materials 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000000137 annealing Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 5
- 239000011572 manganese Substances 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 239000010960 cold rolled steel Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 238000009849 vacuum degassing Methods 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 150000002696 manganese Chemical class 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
- C21D3/04—Decarburising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
Definitions
- an aluminum killed steel For the above mentioned purpose, there has been mostly used an aluminum killed steel.
- aluminum killed steel When aluminum killed steel is hot-rolled and thereafter cooled down as quickly as possible, then cold-rolled and then annealed for recrystallization, aluminum nitride will thereby be precipitated from solution and in consequence a peculiar elongated crystal grain will be formed. This is generally recognized to the cause for the aluminum killed steel to have a higher deep-drawability than of a rimmed steel. Further, as the nitrogen contained in the steel is fixed as aluminum nitride as described above, the steel is nonageing.
- a nonageing steel sheet can be obtained by stabilizing the nitrogen in the steel by adding vanadium and/or boron.
- vanadium and boron have no strong deoxidating action
- the steel to which such elements have been added is a rimmed steel. Therefore, such steel sheet is superior to the aluminum killed steel in the surface properties but is substantially the same as or rather inferior to the latter in deep drawability.
- An object of the present invention is to provide at a low cost and a high yield a steel sheet which is nonageing and whose surface properties and deep drawability are higher than of a steel sheet made of a conventional aluminum killed steel.
- Such object of the present invention is attained by tapping a molten steel composed of less than about 0.10% C, about 0.20% to 0.80% Mn, less than about 0.03% P, less than about 0.03% S, less than about 0.20% Cu and the rest being Fe and unavoidable impurities in a steel making process, pouring into a mold the said molten steel after subjecting it to a vacuum degassing or casting it in a vacuum or an inert gas atmosphere so as to extremely reduce the oxygen content in the steel, making a cold-rolled steel sheet from the said steel by the conventional method and then annealing the said steel sheet "ice for the recrystallization while decarburizing and denitriding it in an atmosphere containing wet hydrogen so that the carbon content in the steel may be less than about 0.01% and the nitrogen content therein may be less than about 0.001%.
- the oxygen content is so low that impurities of oxides in the steel are very low.
- the carbon content is less than 0.01% and the nitrogen content is less than 0.001%.
- the steel sheet of the present invention is substantially nonageing and is so soft that its press-formability and surface properties are higher than those of the conventional aluminum killed steel. Moreover, its yield is also very high.
- the starting composition of the steel is substantially the same as that of an ordinary deep drawing rimmed steel but the steel is decarburized and denitrided so positively in the annealing process as to be remarkably softened. Consequently, the manganese content in the steel sheet of the present invention can be made higher than in the ordinary deep drawing steel and is allowed to be up to about 0.80%.
- this manganese can be utilized to reduce the oxygen content in the steel and to eliminate the bad influence of sulphur which is comparatively magnitudinous in the concentrated segregated part in the head part of the steel ingot.
- Grain size (A.S.T.M.)' No. 7.6.
- the C content was reduced from 0.07% to 0.003%.
- N contentit was reduced to 0.0004% as the result of denitrification 'by wet hydrogen, which means a. very low N content, because even a rimmed steel containing less than 0.10% C produced in an ordinary pure oxygen top blowing converter contains N normally still in the order of 0.0017%. That is, the N content was also reduced to less than a quarter by denitrification'inthe process of annealing. Thus, nonageingsufiici'ent for practical use was obtained.
- What we clairnisr A process for producing .a non-ageingdeep-drawable steel sheet which comprisesvacuum-degassing a molten rimmed steel'consisting essentially of about 0.04 to 0.10% C, about 0.20 to'0.80% Mn, about 0.04 to 0.10% O and Fe whereby the oxygen content of the steel is reduced, casting, slabbing-and cold-rolling said vacuum-degassed As regards the 3, rimmed steel, and then decarburizing annealing said coldrolled steel thereby producing a steel containing less than 0.01% C, less than 0.01% O, and less than 0.001% N.
Description
United States Patent 3,178,318 PRGCESS FOR PRUDUCING NONAGEING SUPER DEEP-DRAWING STEEL SHEETS Mineo Shimizu and Kameo Matsukura, Yawata, Fukuoka, Japan, assignors to Yawata Iron 8: Steel (10., Ltd., Tokyo, Japan, a corporation of Japan No Drawing. Filed Oct. 22, 1962, Ser. No. 232,288 Claims priority, application Japan, Nov. 25, 1961, 36/ 42,894 1 Claim. (Cl. 148-2) This invention relates to processes for producing nonageing super deep-drawing steel sheets to be cold-pressshaped.
For the above mentioned purpose, there has been mostly used an aluminum killed steel. When aluminum killed steel is hot-rolled and thereafter cooled down as quickly as possible, then cold-rolled and then annealed for recrystallization, aluminum nitride will thereby be precipitated from solution and in consequence a peculiar elongated crystal grain will be formed. This is generally recognized to the cause for the aluminum killed steel to have a higher deep-drawability than of a rimmed steel. Further, as the nitrogen contained in the steel is fixed as aluminum nitride as described above, the steel is nonageing.
However, as there is no rimming action in casting the aluminum killed steel, it is necessary to extend the refining time, in order to reduce the carbon content to be as low as in the rimmed deep drawing steel sheet. Moreover, due to the shrinkage pipe produced at the upper portion of the ingot, the yield of such aluminum killed steel is low and its cost is higher than of the rimmed steel.
Further, there is a defect that the surface properties of the killed steel are inferior to those of the rimmed steel, because comparatively many nonmetallic inclusions reside in the surface layer of the former.
On the other hand, a nonageing steel sheet can be obtained by stabilizing the nitrogen in the steel by adding vanadium and/or boron. However, as vanadium and boron have no strong deoxidating action, the steel to which such elements have been added is a rimmed steel. Therefore, such steel sheet is superior to the aluminum killed steel in the surface properties but is substantially the same as or rather inferior to the latter in deep drawability.
Generally, in order to improve the press-formability of a steel sheet, it is desirable to reduce the carbon content in the steel as low as possible. Usually it is made less than 0.08%. The other accompanying elements are also kept as low as possible. However, if the carbon content in the steel is made low in the refining process, the oxygen content will increase with it, the cleanliness of the steel will be reduced and the workability of the steel sheet will be thereby rather reduced. Therefore, it is not practical in general to reduce the carbon content to less than about 0.03% in the melting and casting process.
An object of the present invention is to provide at a low cost and a high yield a steel sheet which is nonageing and whose surface properties and deep drawability are higher than of a steel sheet made of a conventional aluminum killed steel.
Such object of the present invention is attained by tapping a molten steel composed of less than about 0.10% C, about 0.20% to 0.80% Mn, less than about 0.03% P, less than about 0.03% S, less than about 0.20% Cu and the rest being Fe and unavoidable impurities in a steel making process, pouring into a mold the said molten steel after subjecting it to a vacuum degassing or casting it in a vacuum or an inert gas atmosphere so as to extremely reduce the oxygen content in the steel, making a cold-rolled steel sheet from the said steel by the conventional method and then annealing the said steel sheet "ice for the recrystallization while decarburizing and denitriding it in an atmosphere containing wet hydrogen so that the carbon content in the steel may be less than about 0.01% and the nitrogen content therein may be less than about 0.001%.
In the thus obtained steel sheet, the oxygen content is so low that impurities of oxides in the steel are very low. The carbon content is less than 0.01% and the nitrogen content is less than 0.001%. Thus, the steel sheet of the present invention is substantially nonageing and is so soft that its press-formability and surface properties are higher than those of the conventional aluminum killed steel. Moreover, its yield is also very high.
In the process of the present invention, the starting composition of the steel is substantially the same as that of an ordinary deep drawing rimmed steel but the steel is decarburized and denitrided so positively in the annealing process as to be remarkably softened. Consequently, the manganese content in the steel sheet of the present invention can be made higher than in the ordinary deep drawing steel and is allowed to be up to about 0.80%.
This is the more advantageous, because this manganese can be utilized to reduce the oxygen content in the steel and to eliminate the bad influence of sulphur which is comparatively magnitudinous in the concentrated segregated part in the head part of the steel ingot.
The present invention shall be explained with reference to an example.
Example 0.003% C, 0.008% Si, 0.32% Mn, 0.014% P, 0.015% S,
0.073% C11, 0.030% Ni, 0.016% Cr, 0.020% As,
0.002% Mo, 0.002% Ti,
0.005% 0 0.002% soluble Al,
0.001% insoluble Al,
0.0004% total N After the skin pass of a reduction ratio of 0.5%, the mechanical properties of the product were as follows:
0.005% W, 0.000% Co, 0.010% Sn,
Thickness 1.0 mm.
Yield strength 11.5 kg./mm.
Tensile strength 28.1 kg./mm.
Total elongation 53.6% in mm. gage length. Erichsen value 12.2 mm.
Conical cup value 44.12 mm.
Hardness HRB 34.5 Rockwell B scale.
Grain size (A.S.T.M.)' No. 7.6.
In the ordinary refining process, when the C content was as little as this, the 0 content was inevitably more than 0.1%. Even when the steel was tapped with the composition of an ordinary rimmed low carbon steel, about 0.05% 0 was contained therein. But the 0 content was reduced to 0.005% by the vacuum-degassing treatment. According to the A.S.T.M. pointing counting method, the nonmetallic inclusions in the steel sheet produced by the present invention were shown as d=0.05 to 0.10% as compared with an ordinary cold-rolled steel sheet, the nonmetallic inclusions of which are normally shown as d=0.2 to 0.41%, that is, being reduced down to only a quarter of those in an ordinary steel sheet.
12 Moreover, the size of inclusion became very small and distribution was uniformly dispersed.
Due to the clecarburization annealing, the C content was reduced from 0.07% to 0.003%. N contentit was reduced to 0.0004% as the result of denitrification 'by wet hydrogen, which means a. very low N content, because even a rimmed steel containing less than 0.10% C produced in an ordinary pure oxygen top blowing converter contains N normally still in the order of 0.0017%. That is, the N content was also reduced to less than a quarter by denitrification'inthe process of annealing. Thus, nonageingsufiici'ent for practical use was obtained.
What we clairnisr A process for producing .a non-ageingdeep-drawable steel sheet which comprisesvacuum-degassing a molten rimmed steel'consisting essentially of about 0.04 to 0.10% C, about 0.20 to'0.80% Mn, about 0.04 to 0.10% O and Fe whereby the oxygen content of the steel is reduced, casting, slabbing-and cold-rolling said vacuum-degassed As regards the 3, rimmed steel, and then decarburizing annealing said coldrolled steel thereby producinga steel containing less than 0.01% C, less than 0.01% O, and less than 0.001% N.
References Cited by the Examiner UNITED STATES PATENTS OTHER REFERENCES Open'Coil Process, by J. Arnold, Iron and Steel Engineer, 1960, pages 91-111.
DAVID L. RECK, Primary Examiner.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3178318A true US3178318A (en) | 1965-04-13 |
Family
ID=3433363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US232288A Expired - Lifetime US3178318A (en) | 1962-10-22 | Process for producing nonageing super deep-drawing steel sheets |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3178318A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3320099A (en) * | 1964-08-12 | 1967-05-16 | United States Steel Corp | Method of processing steel |
| US3459537A (en) * | 1966-08-25 | 1969-08-05 | United States Steel Corp | Continuously cast steel slabs and method of making same |
| US3853636A (en) * | 1968-11-14 | 1974-12-10 | Nippon Kokan Kk | Method for manufacturing cold rolled steel excellent in press-formability |
| US3865637A (en) * | 1970-02-02 | 1975-02-11 | Nippon Kokan Kk | Process of making cold reduced steel |
| US3935038A (en) * | 1971-10-28 | 1976-01-27 | Nippon Steel Corporation | Method for manufacturing non-oriented electrical steel sheet and strip having no ridging |
| US3951696A (en) * | 1973-08-11 | 1976-04-20 | Nippon Steel Corporation | Method for producing a high-strength cold rolled steel sheet having excellent press-formability |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2095580A (en) * | 1934-06-01 | 1937-10-12 | American Sheet & Tin Plate | Steel strip and its production |
| US2271242A (en) * | 1940-05-23 | 1942-01-27 | Great Lakes Steel Corp | Method of making nonaging steel |
| US2360868A (en) * | 1943-01-02 | 1944-10-24 | Carnegie Illinois Steel Corp | Manufacture of nonaging steel |
| US2444788A (en) * | 1945-02-21 | 1948-07-06 | Carnegie Illinois Steel Corp | Steel strip tempering |
| US2597979A (en) * | 1949-12-21 | 1952-05-27 | United States Steel Corp | Recrystallizing deep-drawing steel |
| US2776204A (en) * | 1952-01-22 | 1957-01-01 | Nat Res Corp | Production of metals |
-
1962
- 1962-10-22 US US232288A patent/US3178318A/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2095580A (en) * | 1934-06-01 | 1937-10-12 | American Sheet & Tin Plate | Steel strip and its production |
| US2271242A (en) * | 1940-05-23 | 1942-01-27 | Great Lakes Steel Corp | Method of making nonaging steel |
| US2360868A (en) * | 1943-01-02 | 1944-10-24 | Carnegie Illinois Steel Corp | Manufacture of nonaging steel |
| US2444788A (en) * | 1945-02-21 | 1948-07-06 | Carnegie Illinois Steel Corp | Steel strip tempering |
| US2597979A (en) * | 1949-12-21 | 1952-05-27 | United States Steel Corp | Recrystallizing deep-drawing steel |
| US2776204A (en) * | 1952-01-22 | 1957-01-01 | Nat Res Corp | Production of metals |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3320099A (en) * | 1964-08-12 | 1967-05-16 | United States Steel Corp | Method of processing steel |
| US3459537A (en) * | 1966-08-25 | 1969-08-05 | United States Steel Corp | Continuously cast steel slabs and method of making same |
| US3853636A (en) * | 1968-11-14 | 1974-12-10 | Nippon Kokan Kk | Method for manufacturing cold rolled steel excellent in press-formability |
| US3865637A (en) * | 1970-02-02 | 1975-02-11 | Nippon Kokan Kk | Process of making cold reduced steel |
| US3935038A (en) * | 1971-10-28 | 1976-01-27 | Nippon Steel Corporation | Method for manufacturing non-oriented electrical steel sheet and strip having no ridging |
| US3951696A (en) * | 1973-08-11 | 1976-04-20 | Nippon Steel Corporation | Method for producing a high-strength cold rolled steel sheet having excellent press-formability |
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