KR20120047444A - Manufacturing method of anvil for hot rolling - Google Patents
Manufacturing method of anvil for hot rolling Download PDFInfo
- Publication number
- KR20120047444A KR20120047444A KR1020100109002A KR20100109002A KR20120047444A KR 20120047444 A KR20120047444 A KR 20120047444A KR 1020100109002 A KR1020100109002 A KR 1020100109002A KR 20100109002 A KR20100109002 A KR 20100109002A KR 20120047444 A KR20120047444 A KR 20120047444A
- Authority
- KR
- South Korea
- Prior art keywords
- anvil
- weight
- hot rolling
- less
- temperature range
- Prior art date
Links
- 238000005098 hot rolling Methods 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 17
- 230000009466 transformation Effects 0.000 claims abstract description 13
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000010791 quenching Methods 0.000 claims description 9
- 230000000171 quenching effect Effects 0.000 claims description 9
- 238000004513 sizing Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 abstract description 3
- 229910052720 vanadium Inorganic materials 0.000 abstract description 3
- 229910052748 manganese Inorganic materials 0.000 abstract description 2
- 229910052804 chromium Inorganic materials 0.000 abstract 1
- 229910052750 molybdenum Inorganic materials 0.000 abstract 1
- 229910052759 nickel Inorganic materials 0.000 abstract 1
- 230000008569 process Effects 0.000 description 8
- 238000005096 rolling process Methods 0.000 description 6
- 229910000851 Alloy steel Inorganic materials 0.000 description 4
- 229910001315 Tool steel Inorganic materials 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005496 tempering Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 229910021386 carbon form Inorganic materials 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- 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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/026—Rolling
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D1/34—Methods of heating
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Forging (AREA)
Abstract
Description
The present invention relates to a method for manufacturing an anvil for hot rolling, and more particularly, to a method for manufacturing an anvil for hot rolling to improve the service life of an anvil for width rolling for sizing presses of hot slabs.
In general, the hot rolling process refers to a process of rolling a slab manufactured through a continuous casting process at a high temperature above a recrystallization temperature to produce a steel sheet having a desired thickness. Referring to this hot rolling process with reference to Figure 1, the slab (1) heated to the temperature required for hot rolling inside the heating furnace (2) is passed through the roughing mill (4) and the finishing mill (5) It is rolled into a steel plate of thickness, and is conveyed along the run-out table 6 and then wound around the take-
Conventionally, as the material of the
However, in the related art, a large difference in the heat treatment temperature range of the
The present invention provides a method for producing an anvil for hot rolling, which improves the service life of an anvil for width rolling for sizing presses of hot slabs.
The present invention provides a method for manufacturing an anvil for hot rolling that is quenched directly to a constant temperature transformation temperature in the heating temperature range of the anvil to increase the tensile strength and yield strength to improve the service life of the anvil.
The method for manufacturing an anvil for hot rolling according to an embodiment of the present invention is a method for manufacturing anvil for sizing presses of hot rolled slabs, comprising the steps of forming an anvil component and heating the anvil in a temperature range of 880 to 900 ° C. And quenching the anvil to a temperature range of 640 ° C.-660 ° C. to transform the anvil to constant temperature. In addition, the anvil may further comprise the step of transforming the constant temperature in the temperature range of 610 ~ 630 ℃.
In the step of forming the anvil component, the anvil is C: 3.2 to 3.8% by weight, Si: 1.8 to 2.5% by weight, Ni: 1.5 to 3.5% by weight, Cr: 0.1 to 0.4% by weight, Mo: 0.4 to 0.6 Weight%, V: 1.0% by weight, Mn: 0.4% by weight, P: 0.08% by weight, Mg: 0.001% by weight, and the remaining Fe and other inevitable impurities.
According to the method of manufacturing an anvil for hot rolling according to an embodiment of the present invention, the anvil heated to a high temperature during annealing of the anvil is quenched to a temperature for constant transformation without quenching to an ordinary temperature, thereby uniformizing the structure distribution of the anvil, It is possible to increase the tensile strength and yield strength by preventing the anvil's structure from coarsening. Therefore, it is possible to improve the productivity of the hot rolling process by improving the service life of the anvil to reduce the time, cost, etc. for repair, replacement of the anvil.
1 is a view schematically showing a hot rolling process.
2 is a graph showing a heat treatment state of the anvil according to the prior art.
3 is a graph showing a heat treatment state of the anvil according to an embodiment of the present invention.
4 is a graph showing a heat treatment state of the anvil according to a modification of the present invention.
Figure 5 is a flow chart illustrating a method of manufacturing an anvil for hot rolling according to the present invention.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms, and only the embodiments of the present invention to complete the disclosure of the present invention, to those skilled in the art It is provided to fully inform the category. Wherein like reference numerals refer to like elements throughout.
3 is a graph showing a heat treatment state of the anvil according to an embodiment of the present invention, Figure 4 is a graph showing a heat treatment state of the anvil according to a modification of the present invention, Figure 5 is hot rolling according to the present invention It is a flowchart which shows the manufacturing method of a dragon anvil.
3 to 5, a method of manufacturing anvil for sizing press of a hot rolled slab according to an embodiment of the present invention comprises the steps of forming an alloy component of the anvil (S110). And, step (S120) of heating the anvil in which the component is formed at a temperature range of 880 ~ 900 ℃, and step (S130) by quenching the heated anvil to a temperature range of 640 ~ 660 ℃ (S130) Include. In addition, the modification may further include the step (S140) of the constant temperature transformation anvil transformed in the temperature range of 640 ~ 660 ° C in the temperature range of 610 ~ 630 ° C (S140).
Anvil (3; Fig. 1) applying a pressing force (about 2200 tons in this embodiment, width rolling size: 20 to 30 mm / 1 times) to both sides of the
Hereinafter, the components included in the anvil will be described in detail.
C: 3.2-3.8 wt%
In hot tool steels, carbon combines with various carbide-forming elements to form a variety of carbides to achieve high strength. When C is included in less than 3.2% by weight, sufficient carbides are not formed, and sufficient strength cannot be achieved. When C is included in excess of 3.8% by weight, excess carbon forms an austenite phase to lower hardness. Let's do it.
Si: 1.8-2.5 wt%
Si added as a deoxidizer increases carbide precipitation to improve hardness and contribute to improvement of oxidation resistance. When Si is included in less than 1.8% by weight, there is almost no deoxidation effect or oxidation resistance improving effect, and when it exceeds 2.5% by weight, a problem occurs that the toughness of the anvil is reduced.
Ni: 1.5-3.5 wt%
As an austenite stabilizing component, the toughness of the anvil is improved. If Ni is less than 1.5% by weight, the toughness improvement effect is remarkably inferior, and if it is contained in excess of 3.5% by weight, the retained austenite is increased to lower machinability and hot formability.
Cr: 0.1-0.4 wt%
As a component for depositing carbide, wear resistance and high strength are realized. It is also an important component that affects oxidation resistance and hot forming. If Cr is less than 0.1% by weight, it is difficult to achieve wear resistance and high strength. In addition, when the content exceeds 0.4% by weight, hot forming is rapidly lowered.
Mo: 0.4-0.6 weight%
Carbide is added to form a carbide, and less than 0.4% by weight of carbide is lowered, and when it exceeds 0.6% by weight, physical properties such as high temperature formation and toughness are lowered.
V: 1.0 wt% or less
As a component added to carbide formation, it improves hardness, heat-checking and abrasion resistance. When V exceeds 1.0 wt%, the toughness, hardness, etc. of the anvil decrease due to excess carbon.
Mn: 0.4 wt% or less, P: 0.08 wt% or less, Mg: 0.001 wt% or less
When the content of each component is exceeded, the structure of the anvil becomes coarse, which lowers the tensile strength and yield strength of the anvil.
When the anvil is formed by including the components as described above, a heat treatment as shown in FIG. 3 or 4 is performed to improve the tensile strength and yield strength of the anvil. (FIG. 3 is a graph showing a QT (Quenching-Tempering) heat treatment process, and FIG. 4 is a graph showing a Quenching-Tempering-Tempering (QTT) heat treatment process.)
In this embodiment, as shown in FIG. 3, the anvil is heated to a temperature range of 880 to 900 ° C. (quenching, S120), and then the anvil is quenched to a temperature range of 640 to 660 ° C. without constant quenching to room temperature. Tempering (S130). Here, the constant temperature transformation means that when the anvil heated in the austenite state is cooled, the cooling is stopped at a constant temperature and the transformation is performed at that temperature.
It can be confirmed from the following Table 1 showing an experimental example that the tensile strength and yield strength of the anvil is increased through such a heat treatment.
[MPa]
[MPa]
[%]
[MPa]
[MPa]
[%]
[%]
(S ratio (%) = (YS / UTS) × 100, YS: tensile strength, UTS: yield strength, E: elongation.)
In [Table 1] above, the reference value refers to the anvil's reference properties for use in the hot rolling process. Conventional specimens are subjected to a heat treatment process that is transformed at constant temperature through heating, quenching and reheating to room temperature, as shown in FIG. On the other hand, specimen A and specimen B are subjected to a heat treatment state according to this embodiment as shown in FIG.
Through Table 1, it can be seen that the tensile strength and the yield strength of the specimens A and B are increased from those of the conventional specimens in the property values after the heat treatment. On the other hand, as a modification of the present embodiment can be transformed to constant temperature anvil transformed constant temperature (S140). In other words, it is possible to further improve the tensile strength and yield strength by refining the anvil structure by re-inverting the anvil at a temperature range of 610 to 630 ° C. lower than the temperature range of the first constant temperature transformation. It can improve the service life of anvil by preventing the occurrence of heat-checking.
According to the method of manufacturing an anvil for hot rolling according to the embodiments of the present invention, the anvil heated to a high temperature during annealing of the anvil is quenched to a temperature for constant transformation without quenching to an ambient temperature, thereby uniformly distributing the structure of the anvil. Therefore, it is possible to increase the tensile strength and yield strength by preventing the anvil's tissue from coarsening. Therefore, it is possible to improve the productivity of the hot rolling process by improving the service life of the anvil to reduce the time, cost, etc. for repair, replacement of the anvil.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Therefore, it will be apparent to those skilled in the art that the present invention may be variously modified and modified without departing from the technical spirit of the following claims.
1: slab 2: heating furnace
3: anvil 4: crude rolling
5: Finishing Mill 6: Run Out Table
7: winding roll
Claims (3)
Formulating the components of the anvil;
Heating the anvil to a temperature range of 880 ° C. to 900 ° C .;
Quenching the anvil to a temperature range of 640 ° C. to 660 ° C. to perform constant temperature transformation;
Method for producing an anvil for hot rolling comprising a.
In the step of forming the components of the anvil,
The anvil is C: 3.2 to 3.8% by weight, Si: 1.8 to 2.5% by weight, Ni: 1.5 to 3.5% by weight, Cr: 0.1 to 0.4% by weight, Mo: 0.4 to 0.6% by weight, V: 1.0% by weight or less, Mn: 0.4% by weight or less, P: 0.08% by weight or less, Mg: 0.001% by weight or less, and a method for producing an anvil for hot rolling composed of remaining Fe and other unavoidable impurities.
The method of manufacturing an anvil for hot rolling further comprises the step of re-constant transformation in the anvil in the temperature range of 610 ~ 630 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020100109002A KR20120047444A (en) | 2010-11-04 | 2010-11-04 | Manufacturing method of anvil for hot rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020100109002A KR20120047444A (en) | 2010-11-04 | 2010-11-04 | Manufacturing method of anvil for hot rolling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR20120047444A true KR20120047444A (en) | 2012-05-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020100109002A KR20120047444A (en) | 2010-11-04 | 2010-11-04 | Manufacturing method of anvil for hot rolling |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR20120047444A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102510839B1 (en) * | 2022-04-05 | 2023-03-17 | 윤석운 | The anvil manufacturing method for the battery cell junction and the anvil getting with the method thereof |
-
2010
- 2010-11-04 KR KR1020100109002A patent/KR20120047444A/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102510839B1 (en) * | 2022-04-05 | 2023-03-17 | 윤석운 | The anvil manufacturing method for the battery cell junction and the anvil getting with the method thereof |
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