US3776784A - Method of processing stainless steel strips or sheets - Google Patents
Method of processing stainless steel strips or sheets Download PDFInfo
- Publication number
- US3776784A US3776784A US00271881A US3776784DA US3776784A US 3776784 A US3776784 A US 3776784A US 00271881 A US00271881 A US 00271881A US 3776784D A US3776784D A US 3776784DA US 3776784 A US3776784 A US 3776784A
- Authority
- US
- United States
- Prior art keywords
- stainless steel
- hot
- strip
- cold
- rolling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 21
- 229910001220 stainless steel Inorganic materials 0.000 title abstract description 30
- 239000010935 stainless steel Substances 0.000 title abstract description 24
- 238000012545 processing Methods 0.000 title description 10
- 238000000137 annealing Methods 0.000 claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 abstract description 23
- 239000010959 steel Substances 0.000 abstract description 23
- 238000005554 pickling Methods 0.000 abstract description 12
- 238000005097 cold rolling Methods 0.000 abstract description 10
- 238000005098 hot rolling Methods 0.000 abstract description 9
- 239000010960 cold rolled steel Substances 0.000 abstract description 3
- 229910052804 chromium Inorganic materials 0.000 description 5
- 239000011651 chromium Substances 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 2
- 239000003518 caustics Substances 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 241000252210 Cyprinidae Species 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 235000021110 pickles Nutrition 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 238000005303 weighing Methods 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
Definitions
- stainless steel sheet and strip is produced by first thoroughly surface conditioning a stainless slab and then heating the slab to a suitable hot rolling temperature usually about 2,000F, but may vary somewhat with different grades.
- the stainless slab is then hot rolled, usually to a conventional hot band gauge of about -inch, and sometimes annealed.
- the hot rolled and annealed steel Prior to cold rolling, the hot rolled and annealed steel must be thoroughly'descaled bya treatment which usually involves pickling the steel in either an acid or caustic solution and for some grades involves a scale-breaking procedure prior to the pickle such as shot blasting.
- Most typical pickling operations provide a continuous treatment first in hot hydrochloric or sulphuric acid and then in a hydrofluoric-nitric acid mixture.
- the steel may be annealed and pickled a second time, or'the defects removed in a continuous coil grinding operation.
- the stainless steel hot band is cold rolled to final gauge, typically about 0.050-inch, and then again continuous annealed, descaled and, if necessary, surface conditioned. Due to the low emissivity of conventional cold rolled stainless steel surface, the final anneal requires a relatively long holding time in order to completely recrystallize the sheet. Hence, slow line speeds are required when annealing cold rolled stainless steel.
- An object of this invention is to provide a new process for producing stainless steel sheet and strip which utilizes fewer processing steps and faster final anneal- I ing and pickling line speeds and therefore results in a cess for producing stainless steel sheet and strip which requires substantially less time on annealing and pickling facilities thereby making such facilities more readily available for processing additional steels.
- a further object of this invention is to provide a less costly process for producing stainless steel sheet and strip for industrial and automotive applications which will therefore reduce the price of such steels and enhance their utilization.
- the process of this invention is particularly applicable to the low chromium ferritic grades of stainless steel for applications not having critical surface finish requirements, specifically applications such as automobile mufflers,heat exchangers industrial piping and other such non-decorative uses.
- the inventive process will make available lower-cost ferritic stainless steels as are particularly desired by the automobile industry to manufacture low-cost engine mufflers suitable to meet future anti-pollution requirements.
- the process is not limited to ferritic stainless steels, it is for all practical purposes limited to production of stainless steels not having critical surface requirements. That is to say, the process can be used to produce austenitic or ferritic stainless steel grades with chromium contents up to about 19 percent with equal or comparable cost savings, but flawless, bright surface qualities cannot be ex pected for any grade.
- any ferritic or austenitic stainless steel containing not more than 19 percent chromium is completely processed to cold rolled sheet or strip substantially in accordance with the prior art practices, but with one notable exception, namely, the hot rolled steel is not descaled prior to cold rolling, but rather the hot band is cold rolled and subsequently annealed with the hot rolling mill scale still on the stainless steel surface. Accordingly, the inventive process first requires that a suitable stainlessslab be hot rolled to conventional hot band gauges, i.e. about 0.10-inch, cooled and then cold rolled to final gauge without descaling after hot rolling.
- Elimination of the descaling operation following hot rolling leads to the obvious advantages of reducing pro cessing time and costs naturally resulting from elimination of one processing step, and rendering the descaling equipment available for processing other materials.
- the steel is subsequently cold rolled with mill scale on the surface thereof, the final surface quality of the steel is not sufficient to meet high standards where appearance is critical. Nevertheless, if the surface appearance is seriously defective and if desired, can usually be improved to more exacting standards by in-line polishing equipment. Of more significance however is the fact that cold rolling and subsequently annealing the steel without descaling the surface does not in any way adversely affect the steels physical or chemical properties.
- the stainless steel hotband without prior descaling leads to a surprising additional advantage, in that the anneal following cold rolling may be effected at line speeds 50 percent faster than possible by prior art processes.
- the steels cold reduced surface will consist of a dull, thin and surprisingly uniform oxide layer which will more readily and easily absorb heat during the final annealing operation. Because of this substantially increased emissivity, the cold rolled steel can be subsequently annealed with shorter holding times, i.e. up to 50 percent faster line speeds.
- Those skilled in the art will recognize that it is of course not possible to give actual line speed figures because the maximum line speed necessary to effect substantially complete recrystallization is dependent upon many variable factors.
- the maximum line speed is dependent not only upon furnace length, but furnace geometry and efficiency, and upon steel grade, sheet thickness and even sheet width in some cases. Therefore, the maximum line speed will vary with different grades of steel, different sheet dimensions and different annealing furnaces. Nevertheless, whatever the maximum line speed may be at given conditions with the prior art practice, that line speed can be increased up to 50 percent when practicing this invention under the same conditions. Accordingly, the inventive process not only provides for elimination of the descaling step prior to cold rolling and the economies resulting therefrom, but further substantially reduces the annealing time after cold rolling to allow up to 50 percent faster line speeds during the anneal and pickling operation.
- the cold rolled stainless steel is annealed with a complete recrystallization, it is then pickled in accordance with conventional procedures. This usually involves continuously passing the steel from the annealing furnace into an acid or caustic pickling solution.
- This slab was hot rolled to 0.085-inch at a starting temperature of 2,250F and coiling temperature of 1,250F. After cooling the hot rolled steel was cold rolled without descaling to 0.050-inch on a 4-high cold reduction mill.
- the cold rolled strip was then continuously annealed in a 90-foot long annealing furnace, at a temperature of 1,850F and at a line speed of feet per minute. The normal line speed for this product processed by prior art practices is 55 feet per minute. Thereafter the strip was passed through a pickling solution of sulfuric acid and then a mixture of nitric and hydrofluoric acid where the cold rolled scale was readily removed.
- the stainless strip exhibited the following properties:
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A process for producing stainless steel sheet and strip by hot rolling a stainless steel slab to conventional hot band gauge and then cold rolling the hot rolled steel without removing the mill scale formed during hot rolling and thereafter continuous annealing and pickling the cold rolled steel at an annealing temperature in excess of 1,700*F and at line speeds up to 50 percent faster than previously possible.
Description
owe 1 1 4, 1973 [54] METHOD 0F PROCESSING STAINLESS 3,684,589 8/1972 Brickner et a1. 148/12 STEEL STPS OR SHEETS 3,694,192 9/1972 Brickner et al. 148/ 12 [75] Inventor: Wilson S. Rowe, Valparaiso, Ind. OTHER PUBLICATIONS [73] Assignee; Unified Stabes Steel Carpa -align ASM Metals Handbook, 8th EdlKlOl'l, VOl. 4, 1969, pp.
Pittsburgh, Pa. 1
[ Flled July 197 Primary Examiner-W. W. Stallard [21] Appl. No.: 271,881 AttarneyForest C. Sexton [52] US. Cl. 1 18/12 [57] ABSTCT [51] Int. Cl C2101 9/46 A process for producing stainless steel sheet and strip [58] Field of Search 148/12 by hot rolling a Stainless steel slab to conventional hot band gauge and then cold rolling the hot rolled steel [56] References Cum without removing the mill scale formed during hot UNITED STATES PATENTS rolling and thereafter continuous annealing and pick- 2,772,992 12/1956 Kiefer'et a1. 148/12 ling the cold rolled steel at an annealing temperature 2,808,353 10/1957 Lelfingwell et 148/12 in excess 0f 1,700F and at line speeds up to 50 per- 2,85l,384 9/1958 Waxweiler 148/12 cent f t than previously possible 3,490,956 1/ 1970 Wilton 148/12 3,650,848 3/1972 Schneider et al. 148/12 2 Claims, N0 Drawings BACKGROUND OF THE INVENTION Although most commercial grades of stainless steel sheet and strip are rolled on the same equipment used for producing carbon steel sheet and strip, the procedures used are somewhat different because of the inherent characteristics of stainless steel. That is, the processing of stainless steel slabs to sheet and strip usually requires much closer control of hot rollingtemperatures, slower cold rolling strip speeds and more extensive surface conditioning. Processing of stainless steel sheet and strip therefore generally requires a more time consuming operation adding to the operational costs and tying-up annealing and pickling facilities. These factors alone add significantly to the cost of the stainless steel sheet and strip.
According to present commercial practices, stainless steel sheet and strip is produced by first thoroughly surface conditioning a stainless slab and then heating the slab to a suitable hot rolling temperature usually about 2,000F, but may vary somewhat with different grades. The stainless slab is then hot rolled, usually to a conventional hot band gauge of about -inch, and sometimes annealed. Prior to cold rolling, the hot rolled and annealed steel must be thoroughly'descaled bya treatment which usually involves pickling the steel in either an acid or caustic solution and for some grades involves a scale-breaking procedure prior to the pickle such as shot blasting. Most typical pickling operations provide a continuous treatment first in hot hydrochloric or sulphuric acid and then in a hydrofluoric-nitric acid mixture. If, after the first annealing and pickling operation some of the surface defects produced by hot rolling are still present, the steel may be annealed and pickled a second time, or'the defects removed in a continuous coil grinding operation. After descaling, the stainless steel hot band is cold rolled to final gauge, typically about 0.050-inch, and then again continuous annealed, descaled and, if necessary, surface conditioned. Due to the low emissivity of conventional cold rolled stainless steel surface, the final anneal requires a relatively long holding time in order to completely recrystallize the sheet. Hence, slow line speeds are required when annealing cold rolled stainless steel.
Since the surface appearance after annealing and pickling is a dull finish, some stainless steels, depending upon end application, will need further processing to effect a bright shiny finish. This typically involves temper rolling the steel and may further include amechanical polishing.
SUMMARY OF THE INVENTION An object of this invention is to provide a new process for producing stainless steel sheet and strip which utilizes fewer processing steps and faster final anneal- I ing and pickling line speeds and therefore results in a cess for producing stainless steel sheet and strip which requires substantially less time on annealing and pickling facilities thereby making such facilities more readily available for processing additional steels.
A further object of this invention is to provide a less costly process for producing stainless steel sheet and strip for industrial and automotive applications which will therefore reduce the price of such steels and enhance their utilization.
DESCRIPTION OF THE PREFERRED EMBODIMENT As noted above, the process of this invention is particularly applicable to the low chromium ferritic grades of stainless steel for applications not having critical surface finish requirements, specifically applications such as automobile mufflers,heat exchangers industrial piping and other such non-decorative uses. Of particular significance is the fact thatthe inventive process will make available lower-cost ferritic stainless steels as are particularly desired by the automobile industry to manufacture low-cost engine mufflers suitable to meet future anti-pollution requirements. Although the process is not limited to ferritic stainless steels, it is for all practical purposes limited to production of stainless steels not having critical surface requirements. That is to say, the process can be used to produce austenitic or ferritic stainless steel grades with chromium contents up to about 19 percent with equal or comparable cost savings, but flawless, bright surface qualities cannot be ex pected for any grade.
According toone embodiment of this invention, any ferritic or austenitic stainless steel containing not more than 19 percent chromium, is completely processed to cold rolled sheet or strip substantially in accordance with the prior art practices, but with one notable exception, namely, the hot rolled steel is not descaled prior to cold rolling, but rather the hot band is cold rolled and subsequently annealed with the hot rolling mill scale still on the stainless steel surface. Accordingly, the inventive process first requires that a suitable stainlessslab be hot rolled to conventional hot band gauges, i.e. about 0.10-inch, cooled and then cold rolled to final gauge without descaling after hot rolling.
Elimination of the descaling operation following hot rolling leads to the obvious advantages of reducing pro cessing time and costs naturally resulting from elimination of one processing step, and rendering the descaling equipment available for processing other materials.
Since the steel is subsequently cold rolled with mill scale on the surface thereof, the final surface quality of the steel is not sufficient to meet high standards where appearance is critical. Nevertheless, if the surface appearance is seriously defective and if desired, can usually be improved to more exacting standards by in-line polishing equipment. Of more significance however is the fact that cold rolling and subsequently annealing the steel without descaling the surface does not in any way adversely affect the steels physical or chemical properties.
In addition to the above advantages cold rolling the stainless steel hotband without prior descaling leads to a surprising additional advantage, in that the anneal following cold rolling may be effected at line speeds 50 percent faster than possible by prior art processes. Specifically, the steels cold reduced surface will consist of a dull, thin and surprisingly uniform oxide layer which will more readily and easily absorb heat during the final annealing operation. Because of this substantially increased emissivity, the cold rolled steel can be subsequently annealed with shorter holding times, i.e. up to 50 percent faster line speeds. Those skilled in the art will recognize that it is of course not possible to give actual line speed figures because the maximum line speed necessary to effect substantially complete recrystallization is dependent upon many variable factors. For example, the maximum line speed is dependent not only upon furnace length, but furnace geometry and efficiency, and upon steel grade, sheet thickness and even sheet width in some cases. Therefore, the maximum line speed will vary with different grades of steel, different sheet dimensions and different annealing furnaces. Nevertheless, whatever the maximum line speed may be at given conditions with the prior art practice, that line speed can be increased up to 50 percent when practicing this invention under the same conditions. Accordingly, the inventive process not only provides for elimination of the descaling step prior to cold rolling and the economies resulting therefrom, but further substantially reduces the annealing time after cold rolling to allow up to 50 percent faster line speeds during the anneal and pickling operation.
After the cold rolled stainless steel is annealed with a complete recrystallization, it is then pickled in accordance with conventional procedures. This usually involves continuously passing the steel from the annealing furnace into an acid or caustic pickling solution. In order to more effectively remove the scale, I prefer to anneal the sheet at temperatures between 1,800 and 1,850F. Such slightly higher annealing temperatures will help to loosen the scale and make it more readily removed during the subsequent pickling.
By using the above process, I have been able to shorten production time for stainless steel sheet coils as much as two weeks. This could help significantly in reducing the price of such steels and provide quicker delivery times to customers.
The following example will serve to illustrate in more detail the process of this invention.
EXAMPLE A Type 409 stainless steel slab weighing 20,520 pounds and measuring 7 inches thick and 49 inches wide was analyzed to consist of 11.24% Cr, 0.05% C, 0.64% Ti, 0.09% Al, and 0.26% Ni. This slab was hot rolled to 0.085-inch at a starting temperature of 2,250F and coiling temperature of 1,250F. After cooling the hot rolled steel was cold rolled without descaling to 0.050-inch on a 4-high cold reduction mill. The cold rolled strip was then continuously annealed in a 90-foot long annealing furnace, at a temperature of 1,850F and at a line speed of feet per minute. The normal line speed for this product processed by prior art practices is 55 feet per minute. Thereafter the strip was passed through a pickling solution of sulfuric acid and then a mixture of nitric and hydrofluoric acid where the cold rolled scale was readily removed. When finished, the stainless strip exhibited the following properties:
Rockwell Hardness B Scale: 73 at one end of the coil;
73 on the other.
Yield Strength (T): 43,275 psi at one end; 43,665 psi on the other.
Tensile Strength (T): 69,040 psi at one end; 69,200
psi on the other.
% Elongation in 2" (T): 31.5 at one end; 31.5 on the other end of the coil.
1 claim:
1. In the process for producing stainless steel sheet and strip containing not more than 19 percent chromium wherein the steel is hot rolled to hot band gauge of about 0.10-inch, cooled, descaled, then cold rolled to final gauge and continuous annealed at a temperature of from about 1,700 to about 1,850F at a line speed sufficient to effect substantially complete recrystallization and finally descaled; the improvement comprising eliminating the descaling step after hot rolling so that the steel is cold rolled and annealed with mill scale on the surface thereof thereby permitting a line speed up to 50 percent faster during said continuous anneal following the cold roll.
2. The process of claim 1 in which said annealing temperature is within the range 1,800 to 1,850F.
Claims (1)
- 2. The process of claim 1 in which said annealing temperature is within the range 1,800* to 1,850*F.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US27188172A | 1972-07-14 | 1972-07-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3776784A true US3776784A (en) | 1973-12-04 |
Family
ID=23037481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00271881A Expired - Lifetime US3776784A (en) | 1972-07-14 | 1972-07-14 | Method of processing stainless steel strips or sheets |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US3776784A (en) |
| JP (1) | JPS4956864A (en) |
| BE (1) | BE802045A (en) |
| CA (1) | CA1007966A (en) |
| DE (1) | DE2333193C2 (en) |
| FR (1) | FR2193087B1 (en) |
| IT (1) | IT991765B (en) |
| LU (1) | LU68003A1 (en) |
| NL (1) | NL7309746A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4421572A (en) * | 1982-03-18 | 1983-12-20 | The United States Of America As Represented By The United States Department Of Energy | Thermomechanical treatment of alloys |
| EP0509177A2 (en) * | 1991-04-18 | 1992-10-21 | T. Sendzimir, Inc. | Means and a method of improving the quality of cold rolled stainless steel strip |
| EP0874061A1 (en) * | 1997-04-22 | 1998-10-28 | Allegheny Ludlum Corporation | Method for batch annealing of austenitic stainless steels |
| US6709528B1 (en) * | 2000-08-07 | 2004-03-23 | Ati Properties, Inc. | Surface treatments to improve corrosion resistance of austenitic stainless steels |
| CN103215422A (en) * | 2013-04-06 | 2013-07-24 | 山东泰山钢铁集团有限公司 | Method for plastically producing thin stainless steel cold-rolled plates by utilizing hot-rolled steel bands |
| CN114058929A (en) * | 2021-11-17 | 2022-02-18 | 山东泰山钢铁集团有限公司 | Efficient rolling method of 400-series stainless steel |
| US20220177989A1 (en) * | 2019-01-28 | 2022-06-09 | Outokumpu Oyj | Method for manufacturing of stainless steel strips |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2370794A1 (en) * | 1976-11-15 | 1978-06-09 | Armco Steel Corp | Prodn. of coinage steel - using a ferritic stainless chromium steel or special surface hardness and smoothness |
| JPS6053726B2 (en) * | 1981-07-31 | 1985-11-27 | 新日本製鐵株式会社 | Method for manufacturing austenitic stainless steel sheets and steel strips |
| JPH0591868U (en) * | 1993-04-08 | 1993-12-14 | 株式会社コバックス | Handwritten numeric data entry form |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2772992A (en) * | 1953-07-13 | 1956-12-04 | Allegheny Ludlum Steel | Process of producing stainless steel |
| US2808353A (en) * | 1953-09-22 | 1957-10-01 | Sharon Steel Corp | Method of making deep drawing stainless steel |
| US2851384A (en) * | 1953-07-03 | 1958-09-09 | Armco Steel Corp | Process of diminishing of ridging in 17-chrome stainless steel |
| US3490956A (en) * | 1965-06-03 | 1970-01-20 | Allegheny Ludlum Steel | Method of producing ferritic stainless steel |
| US3650848A (en) * | 1969-06-18 | 1972-03-21 | Republic Steel Corp | Production of ferritic stainless steel with improved drawing properties |
| US3684589A (en) * | 1970-10-02 | 1972-08-15 | United States Steel Corp | Method for producing a minimum-ridging type 430 stainless steel |
| US3694192A (en) * | 1970-08-11 | 1972-09-26 | United States Steel Corp | Ferritic stainless steels with improved cold-heading characteristics |
-
1972
- 1972-07-14 US US00271881A patent/US3776784A/en not_active Expired - Lifetime
-
1973
- 1973-06-21 CA CA174,695A patent/CA1007966A/en not_active Expired
- 1973-06-29 DE DE2333193A patent/DE2333193C2/en not_active Expired
- 1973-07-06 BE BE133234A patent/BE802045A/en unknown
- 1973-07-12 LU LU68003A patent/LU68003A1/xx unknown
- 1973-07-12 NL NL7309746A patent/NL7309746A/xx not_active Application Discontinuation
- 1973-07-13 JP JP48079192A patent/JPS4956864A/ja active Pending
- 1973-07-13 FR FR7325896A patent/FR2193087B1/fr not_active Expired
- 1973-07-13 IT IT69115/73A patent/IT991765B/en active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2851384A (en) * | 1953-07-03 | 1958-09-09 | Armco Steel Corp | Process of diminishing of ridging in 17-chrome stainless steel |
| US2772992A (en) * | 1953-07-13 | 1956-12-04 | Allegheny Ludlum Steel | Process of producing stainless steel |
| US2808353A (en) * | 1953-09-22 | 1957-10-01 | Sharon Steel Corp | Method of making deep drawing stainless steel |
| US3490956A (en) * | 1965-06-03 | 1970-01-20 | Allegheny Ludlum Steel | Method of producing ferritic stainless steel |
| US3650848A (en) * | 1969-06-18 | 1972-03-21 | Republic Steel Corp | Production of ferritic stainless steel with improved drawing properties |
| US3694192A (en) * | 1970-08-11 | 1972-09-26 | United States Steel Corp | Ferritic stainless steels with improved cold-heading characteristics |
| US3684589A (en) * | 1970-10-02 | 1972-08-15 | United States Steel Corp | Method for producing a minimum-ridging type 430 stainless steel |
Non-Patent Citations (1)
| Title |
|---|
| ASM Metals Handbook, 8th Edition, Vol. 4, 1969, pp. 118. * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4421572A (en) * | 1982-03-18 | 1983-12-20 | The United States Of America As Represented By The United States Department Of Energy | Thermomechanical treatment of alloys |
| EP0509177A2 (en) * | 1991-04-18 | 1992-10-21 | T. Sendzimir, Inc. | Means and a method of improving the quality of cold rolled stainless steel strip |
| EP0509177A3 (en) * | 1991-04-18 | 1993-08-25 | T. Sendzimir, Inc. | Means and a method of improving the quality of cold rolled stainless steel strip |
| EP0874061A1 (en) * | 1997-04-22 | 1998-10-28 | Allegheny Ludlum Corporation | Method for batch annealing of austenitic stainless steels |
| US6709528B1 (en) * | 2000-08-07 | 2004-03-23 | Ati Properties, Inc. | Surface treatments to improve corrosion resistance of austenitic stainless steels |
| CN103215422A (en) * | 2013-04-06 | 2013-07-24 | 山东泰山钢铁集团有限公司 | Method for plastically producing thin stainless steel cold-rolled plates by utilizing hot-rolled steel bands |
| US20220177989A1 (en) * | 2019-01-28 | 2022-06-09 | Outokumpu Oyj | Method for manufacturing of stainless steel strips |
| CN114058929A (en) * | 2021-11-17 | 2022-02-18 | 山东泰山钢铁集团有限公司 | Efficient rolling method of 400-series stainless steel |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2193087B1 (en) | 1976-09-17 |
| CA1007966A (en) | 1977-04-05 |
| NL7309746A (en) | 1974-01-16 |
| FR2193087A1 (en) | 1974-02-15 |
| DE2333193A1 (en) | 1974-01-31 |
| IT991765B (en) | 1975-08-30 |
| LU68003A1 (en) | 1973-09-13 |
| JPS4956864A (en) | 1974-06-03 |
| DE2333193C2 (en) | 1981-12-24 |
| BE802045A (en) | 1974-01-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3776784A (en) | Method of processing stainless steel strips or sheets | |
| US2340461A (en) | Process of producing stainless steel sheet or strip stock | |
| US2808353A (en) | Method of making deep drawing stainless steel | |
| US3490956A (en) | Method of producing ferritic stainless steel | |
| US3067072A (en) | Method of annealing type 430 stainless steel | |
| JPH0730404B2 (en) | New production method of austenitic stainless steel sheet with excellent surface characteristics and materials | |
| US3287237A (en) | Surface treatment of bright annealed strip | |
| USRE28494E (en) | Method of processing stainless steel strips or sheets | |
| US2606848A (en) | Method of making sheet steel | |
| US3684589A (en) | Method for producing a minimum-ridging type 430 stainless steel | |
| US3513036A (en) | Process for producing coiled,hotrolled,pickled steel strip | |
| JPS6149706A (en) | Manufacture of thin austenite stainless-steel sheet | |
| US3591427A (en) | Method of processing steel sheet or strip | |
| CN111636031A (en) | Ultra-low carbon bake-hardening steel and production method thereof | |
| JPH06285508A (en) | Manufacture of stainless cold-rolled steel strip | |
| JPH0128813B2 (en) | ||
| US2781283A (en) | Method of processing stainless steels | |
| US1536663A (en) | Method of manufacturing steel sheets | |
| CN114309116B (en) | Preparation method of wide ultrathin titanium foil strip | |
| JPS6119688B2 (en) | ||
| US1842220A (en) | Sheet metal rolling process | |
| JPH0375317A (en) | Production of ba product of cr stainless steel sheet excellent in surface characteristic | |
| US2358788A (en) | Production of silicon steel of uniformly low core loss | |
| JP3059376B2 (en) | Austenitic stainless steel sheet excellent in gloss and corrosion resistance and method for producing the same | |
| CN116748293A (en) | Rolling method of 2507 duplex stainless steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: USX CORPORATION, A CORP. OF DE, STATELESS Free format text: MERGER;ASSIGNOR:UNITED STATES STEEL CORPORATION (MERGED INTO);REEL/FRAME:005060/0960 Effective date: 19880112 |