KR101758476B1 - Mathod for manufacturing high copper stainless steel with twin roll strip casting apparatus and high copper stainless steel manufactured thereby - Google Patents
Mathod for manufacturing high copper stainless steel with twin roll strip casting apparatus and high copper stainless steel manufactured thereby Download PDFInfo
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- KR101758476B1 KR101758476B1 KR1020150174869A KR20150174869A KR101758476B1 KR 101758476 B1 KR101758476 B1 KR 101758476B1 KR 1020150174869 A KR1020150174869 A KR 1020150174869A KR 20150174869 A KR20150174869 A KR 20150174869A KR 101758476 B1 KR101758476 B1 KR 101758476B1
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 44
- 238000005266 casting Methods 0.000 title claims abstract description 41
- 239000010935 stainless steel Substances 0.000 title claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 239000010949 copper Substances 0.000 title description 51
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title description 7
- 229910052802 copper Inorganic materials 0.000 title description 7
- 238000000034 method Methods 0.000 claims description 30
- 229910000831 Steel Inorganic materials 0.000 claims description 17
- 239000010959 steel Substances 0.000 claims description 17
- 229910001208 Crucible steel Inorganic materials 0.000 claims description 15
- 238000005097 cold rolling Methods 0.000 claims description 15
- 238000005098 hot rolling Methods 0.000 claims description 12
- 238000000137 annealing Methods 0.000 claims description 11
- 238000005554 pickling Methods 0.000 claims description 9
- 239000011651 chromium Substances 0.000 claims description 7
- 230000005499 meniscus Effects 0.000 claims description 6
- 230000003746 surface roughness Effects 0.000 claims description 5
- 238000005422 blasting Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 230000015271 coagulation Effects 0.000 claims description 2
- 238000005345 coagulation Methods 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims 6
- 229910052759 nickel Inorganic materials 0.000 claims 2
- 230000007547 defect Effects 0.000 description 8
- 238000007711 solidification Methods 0.000 description 7
- 230000008023 solidification Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/002—Stainless steels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/0648—Casting surfaces
- B22D11/0651—Casting wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Continuous Casting (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention relates to a method of manufacturing a high Cu stainless steel using a twin roll type thin plate casting machine, and more particularly, to a method of manufacturing a high Cu stainless steel having an excellent surface quality, And a high Cu stainless steel produced thereby.
Description
The present invention relates to a method of manufacturing a high Cu stainless steel using a twin roll type thin plate casting machine, and more particularly, to a method of manufacturing a high Cu stainless steel having an excellent surface quality, And a high Cu stainless steel produced thereby.
A method of manufacturing stainless steel using a twin roll type thin plate casting machine is a method of directly casting a cast steel having a thickness of 2-6 mm from a molten metal, and is a new process for omitting hot rolling in the slab playing method.
Therefore, there is an advantage that the manufacturing cost is reduced as compared with the slab method, the precipitation phase due to rapid solidification is suppressed, and the quality of the slab is also excellent due to refinement of inclusions.
On the other hand, copper (Cu) is added in order to reduce the yield strength of stainless steel and improve the formability. When the yield strength of stainless steel is reduced by Cu addition, springback phenomenon is reduced and workability such as bending is increased , Air conditioner piping, etc., can be substituted for use as a piping of Cu material.
Such Cu-added stainless steels were conventionally produced by continuous casting and slabs were hot-rolled into thin plates having a thickness of 2-6 mm.
However, in the case of producing stainless steel containing Cu by addition of 2.5 wt% or more of Cu by slab-making method, the coagulation and cooling rate are slow, so that a large amount of Cu precipitates are produced in the slab, There is a problem that the workability is deteriorated and an edge crack is generated, and as a result, there is a problem that the rate of realization is lowered. In addition, when Cu is added in an amount of 4% or more, there is a problem that the steel itself is ineffective.
Accordingly, in the production of high-Cu stainless steels containing a large amount of Cu, it is required to develop a manufacturing method capable of ensuring excellent surface quality without defects such as edge cracks.
One aspect of the present invention is a method for replacing a method of manufacturing a high Cu stainless steel by a conventional slab playing method, comprising the steps of: preparing a high Cu stainless steel using a twin roll thin plate casting machine; .
According to an aspect of the present invention, there is provided a casting method comprising casting a cast steel into a cast steel using a twin roll type casting machine; Hot rolling the cast steel to obtain a thin plate; Subjecting the thin plate to an annealing pickling treatment; And a step of cold-rolling the pickling-treated thin plate. The present invention also provides a method of manufacturing high-Cu stainless steel using the twin roll thin plate casting machine.
In another aspect of the present invention, there is provided a nickel-chromium alloy comprising, by weight%, at least 2.0% of copper, at most 0.02% of carbon (excluding 0%), at least one of chromium (Cr) : 7 to 9%, the balance Fe and other unavoidable impurities, and provides a high-Cu stainless steel having a yield strength of 200 MPa or less.
According to the present invention, even when a large amount of Cu is added, it is possible to provide a high-Cu stainless steel excellent in surface quality without defects such as edge cracks.
In addition, when the method provided by the present invention is used, there is an effect of reducing manufacturing cost by shortening the process.
1 is a detailed view of a twin roll type thin plate casting machine.
Fig. 2 is a graph showing the change in yield strength according to the reduction rate of cold rolling.
The inventors of the present invention have made intensive studies on a method for producing a stainless steel having a low yield strength without occurrence of defects such as an edge crack even when copper (Cu) is contained in an amount of 2.0 wt% or more. Cu stainless steel excellent in surface quality can be produced when a high-Cu stainless steel is produced by using a twin-roll type thin plate casting machine instead of the slab-casting method used in the past. The present invention has been completed based on this finding.
Particularly, in the present invention, in producing a high Cu stainless steel by using a twin roll type thin plate casting machine, the yield strength is lowered to improve the workability. Therefore, there is a technical significance in controlling the reduction rate in cold rolling after annealing.
Hereinafter, the present invention will be described in detail.
According to an aspect of the present invention, there is provided a method of producing high Cu stainless steel, comprising: casting a cast steel using a twin roll type thin plate casting machine, the cast steel containing molybdenum (Cu) in an amount of 2.0% or more by weight; Hot rolling the cast steel to obtain a thin plate; Subjecting the thin plate to an annealing pickling treatment; And cold rolling the pickling treated thin plate.
First, in the casting of molten steel containing 2.0% or more by weight of copper (Cu) into a cast steel using a twin roll type casting machine, in order to produce a good cast without cracks, And it is preferable to use a meniscus shield 5 capable of supplying gas.
At this time, the atmospheric gas supplied through the meniscus shield 5 is important to prevent the oxidation of the molten metal and to change the interface energy between the molten steel meniscus and the
On the other hand, molten steel is supplied between the
When the molten steel is supplied into the casting rolls having the unevenness (roughness) formed on the surface by the shot blasting process, the molten steel is first brought into contact with the molten acid first, so that the rough acid becomes the nucleation site of the molten steel solidification. Accordingly, by forming the roughenic acid to have a surface roughness (Ra) of 10 탆 or more, homogeneous nucleation sites are obtained at the time of solidification of molten steel, and homogeneous solidification is caused, thereby making it possible to manufacture a cast steel without defects.
It is preferable that the solidification rate by the above-mentioned casting roll is 100 ° C / s or more. By applying such a rapid cooling rate, segregation can be reduced and generation of Cu precipitates can be suppressed. Even if Cu content in molten steel is increased, It is possible to manufacture such a good cast steel.
The cast steel (8) cast according to the above can be manufactured as a thin plate by the hot rolling mill (12). At this time, the hot rolling is preferably performed at a reduction rate of 10 to 50%.
If the reduction rate is less than 10% in the hot rolling, the core pores formed in the casting structure are not completely removed and cause defects in the final product. On the other hand, if the reduction ratio exceeds 50%, surface defects due to hot rolling may occur It is not preferable.
The thin plate produced according to the above is preferably a black coil product having a scale on the surface thereof, and it is preferable that the thin coil is manufactured as a white coil product by removing the scale by heat treatment in an annealing pickling process.
Thereafter, the thin sheet from which the scale has been removed by the annealing pickling treatment is preferably subjected to a cold rolling and annealing heat treatment process to produce a final cold rolled product.
At this time, the cold rolling is preferably performed at a reduction ratio of 40% or less, which is intended to lower the yield strength.
More specifically, when the reduction rate is set to 40% or less at the time of cold rolling, the crystal grains are deformed at a certain grain size, and crystal grains adjacent to the deformed grains have a large energy difference, resulting in abnormal grain growth. As the grain size becomes coarse, the yield strength of the steel decreases.
If the reduction rate exceeds 40%, the grains to be deformed are increased, and the grain growth normally occurs. In this case, the graining of the grains does not easily occur and the yield strength reduction effect is reduced.
Accordingly, in the present invention, it is preferable to control the reduction rate in cold rolling to 40% or less, more preferably 30% or less, and more preferably 20% or less in order to maximize the yield strength reduction effect . However, in order to secure a minimum cold workability, it is preferable that the rolling rate is 10% or more.
As described above, the high-Cu stainless steel of the present invention produced by controlling the reduction rate in the cold rolling performed after the annealing pickling treatment is advantageously applicable as an application requiring a low yield strength. Particularly, There is an effect that the range of application to the region where the non-ferrous material is used can be widened.
On the other hand, the annealing heat treatment step after the cold rolling is preferably carried out under the process conditions for producing ordinary stainless steel. For example, heat treatment is preferably performed at 1100 to 1200 ° C.
Hereinafter, the high Cu stainless steel according to the present invention will be described in detail.
The high-Cu stainless steel of the present invention contains, by weight%, 2.0% or more of copper (Cu), 0.02% or less (excluding 0%) of carbon (C), 16 to 19% : 7 to 9%, the balance Fe and other unavoidable impurities.
More preferably, the high-Cu stainless steel of the present invention may contain up to 6.0% of the Cu. In the case of using the manufacturing method of the present invention described above, even if a large amount of Cu is contained, there is no defect such as an edge crack Stainless steel can be provided.
In addition, the high-Cu stainless steel of the present invention has a yield strength of 200 MPa or less. Thus, by lowering the yield strength, it is possible to secure a high quality stainless steel having high-quality formation.
Hereinafter, the present invention will be described more specifically by way of examples. It should be noted, however, that the following examples are intended to illustrate the invention in more detail and not to limit the scope of the invention. Since the scope of the present invention is determined by the matters described in the claims and the matters reasonably deduced therefrom
( Example One)
Cu-added stainless steels having the compositions shown in Table 1 below were melted and continuously cast into thin plates using a twin roll type thin plate casting machine. At this time, the solidification rate was set to 100 ° C / s or more, and the casting roll had a surface roughness of 10 μm or more by shot blasting. In addition, nitrogen was supplied through a meniscus shield.
Then, the produced cast steel was hot-rolled at a reduction ratio of 30% in a hot rolling mill to produce high-Cu stainless steel.
Edge quality and surface quality of each hot rolled product were visually confirmed, and the results are shown in Table 2 below.
In this case, the edge quality is represented by "○" when there is no edge crack, "△" when edge crack is partially generated, and by "×" when edge crack is severe and subsequent process is impossible.
In the case of surface cracks, the presence of defects due to surface cracking was also checked and evaluated on the same basis.
For comparison, each of the high-Cu stainless steels was manufactured by applying the slab method to the
At this time, steel slabs were prepared by reheating (1200 ° C) - hot rolling (finish rolling temperature: 850 ° C) - winding (600 ° C).
As shown in Table 2, when the high-Cu stainless steel was produced according to the conditions proposed in the present invention by using the twin roll type thin plate casting method, edge quality and surface quality were excellent in all cases.
On the other hand, when the slab method is used, the edge quality and surface quality deteriorate as the Cu content increases.
( Example 2)
Molten steel containing not less than 2.0% of Cu, not more than 0.02% of C, 16 to 19% of Cr, and 7 to 9% of Ni was continuously cast in the same manner as in Example 1 to produce a thin plate, Lt; / RTI > Then, high Cu stainless steel was produced by cold rolling by applying a reduction ratio of 10 to 66%.
The yield strengths of the respective high-Cu stainless steels were measured, and the results are shown in Fig.
As shown in FIG. 2, the yield strength value tends to be kept constant when the reduction rate in cold rolling exceeds 40%, but it is confirmed that the yield strength decreases at 40% or less. In particular, when the reduction rate is 20% or less, the yield strength is greatly reduced and the yield strength reduction effect can be maximized.
1 ... casting
3 ...
5 ... Meniscus Shield 6 ... Brush Roll
7 ...
9 ...
11 ... Winding
Claims (9)
Hot rolling the cast steel to obtain a thin plate;
Subjecting the thin plate to an annealing pickling treatment; And
And cold rolling the thin sheet subjected to annealing and pickling treatment.
The casting step includes casting a molten steel into a casting roll, supplying an atmospheric gas into the molten steel through a meniscus shield, and cooling the casting roll using a twin roll type casting machine having a coagulation speed of 100 ° C / Method of making Cu stainless steel.
Wherein the casting roll has a surface roughness (Ra) of at least 10 mu m by shot blasting to obtain a high-Cu stainless steel casting machine.
Wherein the hot rolling is performed at a reduction rate of 10 to 50%.
Wherein the cold rolling is performed at a reduction ratio of 40% or less. ≪ RTI ID = 0.0 > 21. < / RTI >
And further annealing is performed after the cold rolling. The method for manufacturing high Cu stainless steel using the twin roll thin plate casting machine.
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|---|---|---|---|
| KR1020150174869A KR101758476B1 (en) | 2015-12-09 | 2015-12-09 | Mathod for manufacturing high copper stainless steel with twin roll strip casting apparatus and high copper stainless steel manufactured thereby |
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| KR1020150174869A KR101758476B1 (en) | 2015-12-09 | 2015-12-09 | Mathod for manufacturing high copper stainless steel with twin roll strip casting apparatus and high copper stainless steel manufactured thereby |
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| KR101758476B1 true KR101758476B1 (en) | 2017-07-27 |
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