KR101795871B1 - Mathod for manufacturing high copper stainless steel with twin roll strip casting apparatus - Google Patents
Mathod for manufacturing high copper stainless steel with twin roll strip casting apparatus Download PDFInfo
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- KR101795871B1 KR101795871B1 KR1020150174864A KR20150174864A KR101795871B1 KR 101795871 B1 KR101795871 B1 KR 101795871B1 KR 1020150174864 A KR1020150174864 A KR 1020150174864A KR 20150174864 A KR20150174864 A KR 20150174864A KR 101795871 B1 KR101795871 B1 KR 101795871B1
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- casting
- surface roughness
- stainless steel
- steel
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- 238000005266 casting Methods 0.000 title claims abstract description 46
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 239000010949 copper Substances 0.000 title claims description 47
- 239000010935 stainless steel Substances 0.000 title claims description 23
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims description 8
- 229910052802 copper Inorganic materials 0.000 title claims description 8
- 238000000034 method Methods 0.000 claims description 29
- 230000003746 surface roughness Effects 0.000 claims description 25
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 229910001208 Crucible steel Inorganic materials 0.000 claims description 13
- 238000005098 hot rolling Methods 0.000 claims description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 239000011651 chromium Substances 0.000 claims description 6
- 238000007711 solidification Methods 0.000 claims description 6
- 230000008023 solidification Effects 0.000 claims description 6
- 230000005499 meniscus Effects 0.000 claims description 5
- 238000005422 blasting Methods 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 230000007547 defect Effects 0.000 description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 11
- 238000000137 annealing Methods 0.000 description 10
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- 239000007789 gas Substances 0.000 description 7
- 238000005554 pickling Methods 0.000 description 7
- 239000000047 product Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 230000015271 coagulation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000010521 absorption reaction Methods 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
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- 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
- 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
- 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
- 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
- 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
- B22D11/0665—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating
- B22D11/0668—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating for dressing, coating or lubricating
-
- 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
- B22D11/16—Controlling or regulating processes or operations
-
- 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
- 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
Abstract
The present invention relates to a method for producing high Cu stainless steels using a twin roll laminate casting machine.
Description
The present invention relates to a method for producing high Cu stainless steels using a twin roll laminate casting machine.
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 the stainless steel and improve the formability. When the yield strength of the stainless steel is reduced by adding Cu, the springback phenomenon is reduced, So that it is possible to replace the use of Cu as a piping or the like in an electronic product such as an air conditioner piping.
Conventionally, stainless steel to which Cu has been added has been produced by continuous casting and hot rolled to produce a thin plate having a thickness of 2-6 mm (Patent Document 1).
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.
In this case, the roughness of the as-cast strip is easily deformed, and the oxide scale at the boundary portion is not completely removed from the annealing and pickling process and remains. Thereby causing surface defects.
Accordingly, in the production of high-Cu stainless steels containing a large amount of Cu, it is required to develop a technique capable of ensuring excellent surface quality without defects such as edge cracks and the like.
One aspect of the present invention relates to a method of manufacturing a high-Cu stainless steel by a twin-roll thin sheet casting method, and more particularly, to a method of manufacturing a high-Cu stainless steel having excellent surface quality, And the like.
According to an aspect of the present invention, there is provided a method for producing an as-cast strip by injecting molten steel containing 2.5% or more by weight of copper (Cu) into two casting rolls rotating in opposite directions, Wherein the as-cast strip has a surface roughness (Ra) of 10 to 14 占 퐉, wherein the as-cast strip has unevenness on the surface of the casting roll.
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 schematic view showing the cause of the surface defect in the high Cu cast steel.
Fig. 3 is a photograph of surface defects ((a) is a photograph of a surface, and (b) is a photograph of a cross section) in a comparative example according to an aspect of the present invention.
Generally, a stainless steel by a twin roll type thin plate casting method is produced by hot rolling a cast steel cast by a casting roll to obtain a hot rolled thin steel plate of a black coil, then heat treating it in an annealing pickling step to remove scales, And then subjected to a cold rolling and annealing heat treatment process to produce a final cold rolled product.
The present inventors have found that when a stainless steel containing copper (Cu) in an amount of 2.0 wt% or more is produced by a twin-roll thin sheet casting method using such a twin roll thin sheet casting method, a cast steel (As- Cast strips transferred to the surface of the steel sheet were deformed in the subsequent hot rolling process. As a result, the scale remained in spite of the annealing and pickling process, causing surface defects.
As a result, it has been confirmed that, when controlling the surface irregularity, that is, the surface roughness formed on the surface of the as-cast strip, surface defects are reduced and high Cu stainless steel having good surface quality can be produced. I have come to completion.
Hereinafter, the present invention will be described in detail with reference to the drawings.
A method of manufacturing a high-Cu stainless steel according to an aspect of the present invention is characterized in that molten steel containing 2.5% by weight or more of copper (Cu) is injected between two casting rolls rotating in the opposite direction, cast strips can be prepared and then subjected to subsequent processes such as hot rolling.
More specifically, in casting a molten steel containing 2.0% by weight or more of copper (Cu) into a cast steel using a twin roll type thin plate casting machine, it is preferable to uniformly coagulate the steel at a full width in order to produce a good cast without cracks Do. To this end, in the present invention, it is preferable to use a meniscus shield 5 capable of completely covering the molten bath surface and supplying gas as shown in Fig.
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, for the production of an as-cast strip, molten steel is supplied to a pair of
When the molten steel is supplied into the casting rolls having the unevenness (roughness) formed on its surface by the shot blasting process, the molten steel is first brought into contact with the molten metal 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.
The above-mentioned atmosphere gas should be such that the solidifying cell is sufficiently transferred to the irregularities on the surface of the casting roll. As an example of the atmospheric gas, when nitrogen is used, it is important to absorb nitrogen as molten steel, and the absorption rate of nitrogen is as follows.
d [% N] / dt = K (A / V) ([% N] s - [%
K: mass transfer coefficient, A: reaction area, V: volume of molten steel
[% N] s : equilibrium concentration of nitrogen
[% N]: actual concentration of nitrogen
As described above, it is preferable that the coagulation speed of the casting roll having a surface roughness (Ra) of 10 탆 or more is 100 ° C / s or more. By applying such a rapid cooling rate, the segregation of Cu is reduced to suppress the formation of Cu precipitates And it is possible to produce a cast steel having a good surface quality even if the Cu content in the molten steel is increased.
On the other hand, the as-cast strip of the present invention manufactured by the casting roll described above is also transferred to the surface of the cast steel, and the as-cast strip is also subjected to surface irregularities I have.
When the as-cast strip having the surface irregularities is hot-rolled by a rolling mill (In-line rolling mill 12) at a constant reduction rate, the irregularities are deformed (IRM-deformed) The oxidized scale present in the oxide is trapped inside. This can not be removed even after the subsequent annealing and pickling step, resulting in surface defects of the product (FIG. 2).
In the present invention, in order to fundamentally solve the above problems, there is a technical feature in controlling the surface roughness Ra of the cast steel having the as-cast strip of the present invention, that is, the surface irregularities.
More specifically, it is preferable that the as-cast strip has a surface roughness (Ra) of 10 to 14 占 퐉, and it is preferable that the transfer rate of the roughness of the casting roll surface The following relational expression 1) satisfies 50% or more. That is, when the coagulation cell completely transfers the unevenness of the surface of the casting roll to the cast steel and the roughness value of the casting roll and the cast steel becomes the same, the transfer ratio becomes 100%.
[Relation 1]
Transfer rate (%) = (As-cast strip surface roughness (Ra, 占 퐉)) / (casting roll surface roughness (Ra,
If the surface roughness of the as-cast strip is less than 10 탆, the transfer rate of the roughness of the casting roll is as low as less than 50%, and the gas gap is increased in the casting roll roughness, Thereby causing a surface crack in the as-cast strip.
On the other hand, when the surface roughness of the as-cast strip exceeds 14 탆, the transfer rate of the surface roughness of the casting roll is sufficient. However, since the height of the surface roughness is increased, it easily lays down upon deformation due to hot rolling, which can not be removed in the subsequent annealing and pickling process, thereby causing surface defects such as hook blemishes in the final product.
Therefore, it is preferable to control the surface roughness of the As-cast strip of the present invention to 10 to 14 占 퐉.
The as-cast strip of the present invention, whose surface roughness has been controlled as described above, can be subsequently formed into a thin plate by the hot rolling
If the reduction rate is less than 10% in the hot rolling, the center portion formed in the cast structure is not completely removed and there is a problem of causing defects in the final product. On the other hand, if it exceeds 50%, surface defects due to hot rolling may occur It is not preferable.
The thin plate produced according to the above is a black coil product having a scale on the surface thereof. The thin plate can be manufactured as a cold rolled product of a final white coil through a cold rolling and annealing heat treatment process after heat treatment in a annealing and pickling process.
At this time, in addition to the annealing and pickling step, the cold rolling and annealing heat treatment step may be performed under conditions for producing ordinary stainless steel, and is not particularly limited.
Even if a final cold-rolled product is produced through a subsequent process from an as-cast strip according to the present invention, a stainless steel having excellent surface quality can be produced without occurrence of edge cracks. In particular, Quality can be obtained.
On the other hand, the high Cu stainless steel produced by the present invention may contain Cu in an amount of 2.5% by weight or more, more preferably 6% by maximum. If the content of Cu exceeds 6%, there is a problem that it becomes difficult to produce high-Cu stainless steel having good surface quality even if stainless steel is manufactured by applying the method of the present invention. Therefore, it is preferable to limit the upper limit of Cu to 6%.
In addition, the high-Cu stainless steel of the present invention may contain elements such as Cr, Ni, and C in addition to the above-described Cu.
(Cu): not less than 0.02% (excluding 0%), chromium (Cr): 16 to 19%, nickel (Ni): 7 to 9% The balance Fe and other unavoidable impurities.
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. The scope of the present invention is determined by the matters set forth in the claims and the matters reasonably inferred therefrom.
( Example )
The high-Cu-containing stainless steel casting was produced by using the twin roll type casting machine of Fig. The casting roll used had a surface roughness of 20 mu m. The Cu content in the molten steel was 2.9 wt%, and the other components were 0.02% or less of C, 16 to 19% of Cr, 7 to 9% of Ni, .
The surface of each of the produced as-cast strips was visually inspected for defects (presence of defects: x, absence of defects: o), and the respective transfer ratios were measured and shown in the following Table 1 .
(Ra, 占 퐉)
(%)
Whether
(Hook Hm)
As shown in Table 1, when the surface roughness of the as-cast strip is 10 μm or more, it can be confirmed that surface cracks do not occur in all the examples.
However, it can be confirmed that a surface defect occurs only when the surface roughness of the cast steel exceeds 14 μm.
1 ... casting
3 ...
5 ... Meniscus Shield 6 ... Brush Roll
7 ...
9 ...
11 ... Winding
Claims (7)
Wherein the surface of the casting roll has unevenness and the casting roll has a surface roughness transfer ratio (relational expression 1) of 50% or more and less than 72% to the as-cast strip, ) Has a surface roughness (Ra) of 10 to 14 占 퐉. The method of producing high Cu stainless steel using the twin roll type thin plate casting machine.
[Relation 1]
Transfer rate (%) = (As-cast strip surface roughness (Ra, 占 퐉)) / (casting roll surface roughness (Ra,
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.
The method for manufacturing the as-cast strip may include:
Wherein a molten gas is supplied into the molten steel through a meniscus shield and a solidification rate of the casting roll is 100 DEG C / s or more.
Further comprising the step of hot-rolling the produced cast steel to obtain a thin plate.
Wherein the hot rolling is performed at a reduction rate of 10 to 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150174864A KR101795871B1 (en) | 2015-12-09 | 2015-12-09 | Mathod for manufacturing high copper stainless steel with twin roll strip casting apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150174864A KR101795871B1 (en) | 2015-12-09 | 2015-12-09 | Mathod for manufacturing high copper stainless steel with twin roll strip casting apparatus |
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| Publication Number | Publication Date |
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| KR20170068657A KR20170068657A (en) | 2017-06-20 |
| KR101795871B1 true KR101795871B1 (en) | 2017-12-04 |
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| KR101977492B1 (en) * | 2017-11-10 | 2019-08-28 | 주식회사 포스코 | Austenitic stainless steel and method for manufacturing the same |
| KR20190072321A (en) * | 2017-12-15 | 2019-06-25 | 주식회사 포스코 | Method for manufacturing high copper stainless steel having good surface quality |
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