CN115595418A - Online water toughening treatment technology for wear-resistant steel Mn13 medium plate - Google Patents
Online water toughening treatment technology for wear-resistant steel Mn13 medium plate Download PDFInfo
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- CN115595418A CN115595418A CN202211270327.1A CN202211270327A CN115595418A CN 115595418 A CN115595418 A CN 115595418A CN 202211270327 A CN202211270327 A CN 202211270327A CN 115595418 A CN115595418 A CN 115595418A
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- Prior art keywords
- temperature
- toughening treatment
- water toughening
- medium plate
- rolling
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- 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
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- 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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
-
- 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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
-
- 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
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
- C21D11/00—Process control or regulation for heat treatments
-
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B2001/225—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 plates, strips, bands or sheets of indefinite length by hot-rolling
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to the field of production process, in particular to an online water toughening treatment technology for a wear-resistant steel Mn13 medium plate, which comprises the following production process flows: heating, rolling, online water toughening treatment, straightening, cutting, inspection and delivery to a warehouse; the invention has the beneficial effects that: 1. the delivery cycle of Mn13 is shortened through online water toughening treatment, the problem of insufficient capacity of offline heat treatment is solved, and the production cost of the steel plate is reduced. 2. The finish rolling temperature and the water toughening treatment process are reasonably controlled, so that the wear resistance of the Mn13 medium plate is ensured, and the flatness of the steel plate is ensured.
Description
Technical Field
The invention relates to the field of production processes, in particular to an online water toughening treatment technology for a wear-resistant steel Mn13 medium plate.
Background
The initial hardness of the wear-resistant steel Mn13 medium plate (with the thickness specification of 6-40 mm) is low, the surface layer of the steel is instantly subjected to work hardening under the action of strong impact or large load, the surface hardness of the steel plate is rapidly increased to more than 500HB along with the rapid accumulation of hardening effect, and the steel substrate still maintains the good impact resistance of austenitic steel. The conventional Mn13 medium plate is produced by adopting a rolling and offline water toughening treatment mode, the delivery period is long, the cost is high, and the offline heat treatment can cause the surface of a steel plate to be decarburized, so that the wear resistance is influenced. The invention provides a production method for online water toughening treatment of a wear-resistant steel Mn13 medium plate by comprehensively considering factors such as steel type characteristics, equipment capacity, product quality and the like.
The invention aims to provide a production method for online water toughening treatment of a wear-resistant steel Mn13 medium plate, which utilizes the residual heat after rolling the medium plate, reasonably controls the finish rolling temperature of a steel plate and a cooling process, and achieves the effect of water toughening treatment of the Mn13 medium plate.
Disclosure of Invention
The invention aims to solve the problems and provides an online water toughening treatment technology for a wear-resistant steel Mn13 medium plate.
The purpose of the invention is realized by the following steps: an online water toughening treatment technology for a wear-resistant steel Mn13 medium plate, which comprises the following production process flows: heating, rolling, online toughening treatment, straightening, cutting, inspection and delivery to a warehouse; the method comprises the following specific steps: the method comprises the following steps: a blank heating process: heating by a three-section heating furnace, wherein the temperature of a Mn13 preheating section is less than or equal to 1000 ℃, the temperature of a heating section is 1190-1230 ℃, the temperature of a soaking section is 1190-1260 ℃, and the total standing time is 10-12min/10mm; step two: the rolling process comprises the following steps: rolling at a high reduction ratio, wherein the pass deformation rate is 15-30%, the final rolling temperature of the Mn13 medium plate is controlled at 900-930 ℃, the grain size is thicker when the temperature is too high, and carbide begins to be separated out when the temperature is too low;
step three: the online water toughening treatment process comprises the following steps: the method has the advantages that the waste heat after rolling is utilized for online water toughening treatment, carbides are easily precipitated when the opening cooling temperature of the Mn13 medium plate is too low, and the cooled plate shape is easily deformed when the opening cooling temperature is too high, so that the opening cooling temperature of the online water toughening treatment is 850-880 ℃, the final cooling temperature is 150-200 ℃, and the retained reddening temperature is convenient for subsequent straightening and cutting; step four: and (4) keeping the temperature of the red returning to be straightened on line, cutting four sides of the straightened steel plate by a shearing machine, sampling, inspecting and handing over to a warehouse, wherein the unevenness of the straightened steel plate is less than or equal to 5 mm/m.
The temperature of the red-back is 150-200 ℃.
The beneficial effects of the invention are: 1. the delivery cycle of Mn13 is shortened through online water toughening treatment, the problem of insufficient capacity of offline heat treatment is solved, and the production cost of the steel plate is reduced.
2. The finish rolling temperature and the water toughening treatment process are reasonably controlled, so that the wear resistance of the Mn13 medium plate is ensured, and the flatness of the steel plate is ensured.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a gold phase diagram of a steel sheet, and it can be seen that no carbide precipitates on grain boundaries after the line patenting treatment.
Detailed Description
(I) production process flow
Heating, rolling, online water toughening treatment, straightening, cutting, inspection and delivery.
(II) technical scheme
1. Blank heating process
The invention adopts a three-stage heating furnace for heating, the temperature of the Mn13 preheating section is less than or equal to 1000 ℃, the temperature of the heating section is 1190-1230 ℃, the temperature of the soaking section is 1190-1260 ℃, and the total standing time is 10-12min/10mm.
2. Rolling process
According to the thermodynamic calculation, the carbide mass fraction of Mn13 changes with the temperature under the equilibrium condition, cementite is precipitated from the matrix from 847 ℃, and the total carbide amount is almost unchanged between 557 ℃ and room temperature although the carbide type changes. Therefore, the invention adopts a temperature-increasing and rapid-rolling mode for production, and requires that the final rolling temperature of the Mn13 medium plate is more than or equal to 900 ℃.
3. Online water toughening treatment process
The method utilizes the residual heat after rolling for on-line water toughening treatment, carbide is easily precipitated when the open cooling temperature of the Mn13 medium plate is too low, and the cooled plate shape is easily deformed when the open cooling temperature is too high, so that the open cooling temperature of the on-line water toughening treatment is 850-900 ℃, the final cooling temperature (re-reddening temperature) is 150-200 ℃, and a certain temperature is reserved for facilitating the subsequent plate shape straightening with temperature.
Example one
According to the technical scheme, the online water toughening production of the Mn13 medium plate is completed in 2022 years in 4 months, which comprises the following steps:
1. a heating process: the specification of the blank is 175 x 1020 x 2100 (mm), the temperature of a preheating section is 952 ℃, the temperature of a heating section is 1220 ℃, the temperature of a soaking section is 1248 ℃, and the total residence time of the blank is 205 minutes.
2. The rolling process comprises the following steps: the steel plate finish rolling temperature is 913 ℃. The initial cooling temperature of online water toughening treatment is 881 ℃, and the final cooling temperature (the temperature of red return) is 185 ℃.
3. The finished product of the steel plate has the specification of 14mm, the unevenness after straightening is 3mm/m, the 90-degree cold bending performance is qualified, and no carbide is precipitated on a crystal boundary.
Example two
According to the technical scheme, the online water toughening production of the Mn13 medium plate is completed again in 2022 months in 5 months, which comprises the following steps:
1. a heating process: the specification of the blank is 175 x 1020 x 2100 (mm), the temperature of a preheating section is 943 ℃, the temperature of a heating section is 1228 ℃, the temperature of a soaking section is 1245 ℃, and the total residence time of the blank is 198 minutes.
2. The rolling process comprises the following steps: the steel plate finish rolling temperature is 908 ℃. The initial cooling temperature of the online water toughening treatment is 878 ℃, and the final cooling temperature (re-reddening temperature) is 181 ℃.
3. The finished steel plate has the specification of 12mm, the unevenness after straightening is 3mm/m, the 90-degree cold bending performance is qualified, and no carbide is precipitated on the crystal boundary.
The method utilizes the residual heat after the medium plate is rolled, achieves the effect of water toughening treatment of the Mn13 medium plate by reasonably controlling the final rolling temperature and the cooling process of the steel plate, shortens the delivery period of the Mn13 medium plate, solves the problems of insufficient capacity and surface decarburization of the off-line heat treatment, and simultaneously reduces the production cost of the steel plate.
The above description is only an embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the present invention.
Claims (2)
1. The on-line water toughening treatment technology for the wear-resistant steel Mn13 medium plate is characterized by comprising the following steps of: the production process flow comprises the following steps: heating, rolling, online water toughening treatment, straightening, cutting, inspection and delivery to a warehouse; the method comprises the following specific steps:
the method comprises the following steps: a blank heating process: heating with a three-stage heating furnace, wherein the temperature of Mn13 preheating section is less than or equal to 1000 ℃, the temperature of heating section is 1190-1230 ℃, the temperature of soaking section is 1190-1260 ℃, and the total standing time is 10-12min/10mm;
step two: the rolling process comprises the following steps: rolling at a high reduction ratio, wherein the pass deformation rate is 15-30%, the final rolling temperature of the Mn13 medium plate is controlled at 900-930 ℃, the grain size is thicker when the temperature is too high, and carbide begins to be separated out when the temperature is too low;
step three: the online water toughening treatment process comprises the following steps: the method has the advantages that the waste heat after rolling is utilized for online water toughening treatment, carbides are easily precipitated when the opening cooling temperature of the Mn13 medium plate is too low, and the cooled plate shape is easily deformed when the opening cooling temperature is too high, so that the opening cooling temperature of the online water toughening treatment is 850-880 ℃, the final cooling temperature is 150-200 ℃, and the retained reddening temperature is convenient for subsequent straightening and cutting;
step four: and (4) keeping the temperature of the red returning to be straightened on line, shearing four sides of the straightened steel plate by a shearing machine, sampling, inspecting and handing over to a warehouse, wherein the unevenness of the straightened steel plate is less than or equal to 5 mm/m.
2. The on-line water toughening treatment technology for the wear-resistant steel Mn13 medium plate according to claim 1, characterized in that: the temperature of the red-back is 150-200 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211270327.1A CN115595418A (en) | 2022-10-18 | 2022-10-18 | Online water toughening treatment technology for wear-resistant steel Mn13 medium plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211270327.1A CN115595418A (en) | 2022-10-18 | 2022-10-18 | Online water toughening treatment technology for wear-resistant steel Mn13 medium plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115595418A true CN115595418A (en) | 2023-01-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211270327.1A Pending CN115595418A (en) | 2022-10-18 | 2022-10-18 | Online water toughening treatment technology for wear-resistant steel Mn13 medium plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115595418A (en) |
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2022
- 2022-10-18 CN CN202211270327.1A patent/CN115595418A/en active Pending
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