CN110628992A - Tempering method for processing medium-low temperature wear-resistant steel - Google Patents
Tempering method for processing medium-low temperature wear-resistant steel Download PDFInfo
- Publication number
- CN110628992A CN110628992A CN201910923056.7A CN201910923056A CN110628992A CN 110628992 A CN110628992 A CN 110628992A CN 201910923056 A CN201910923056 A CN 201910923056A CN 110628992 A CN110628992 A CN 110628992A
- Authority
- CN
- China
- Prior art keywords
- furnace
- steel
- steel plate
- low temperature
- cushion blocks
- 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.)
- Pending
Links
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
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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 Articles (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
The invention discloses a tempering method for processing medium-low temperature wear-resistant steel, which adopts a trolley furnace, wherein three groups of cushion blocks which are parallel up and down are additionally arranged in the trolley furnace, a steel plate to be tempered is placed on each layer of cushion block, the furnace temperature is uniformly set to be 180 ℃, the heating speed is uniformly set to be 40 ℃/h, the heat preservation time is set to be 8h, the reversing time is set to be 8min, and the tempering treatment work can be carried out after the equipment point inspection, the screening and the placing of the cushion blocks and the steel plate. The invention has the advantages of simple structure and convenient operation, not only increases the yield and ensures the quality of the tempered steel plate, but also improves the production efficiency and reduces the production cost.
Description
Technical Field
The invention relates to the technical field of production of medium-low temperature wear-resistant steel, in particular to a tempering method for processing the medium-low temperature wear-resistant steel.
Background
At present, when medium-low temperature wear-resistant series steel is produced, a trolley furnace is generally adopted for tempering. The trolley furnace is generally heated by electric heat, the heating fan heats the steel plate through an air supply mode at the top of the trolley furnace, in order to ensure the heating uniformity, an air supply system at the top of the trolley furnace needs to swing left and right, and the swing time is the reversing time. However, the traditional tempering method is limited by the process, the steel plate is long in heating time, the number of furnace charging blocks is small, the production efficiency is basically 3 blocks per furnace, the cost of per ton steel is high, the production quantity is low, the cost is high, the contract delivery is slow, and the cooperation process is influenced.
Disclosure of Invention
The invention aims to solve the problems of low efficiency, high cost and low yield of the existing tempering method, and provides the tempering method for processing the medium-low temperature wear-resistant steel.
In order to achieve the purpose, the invention adopts the following technical scheme:
a tempering method for processing medium-low temperature wear-resistant steel uses a trolley furnace, and comprises the following specific operation steps:
(1) setting the furnace temperature and the heating speed: the furnace temperature is uniformly set to 180 ℃, and the heating speed is uniformly set to 40 ℃/h;
(2) setting the heat preservation time: when different thickness specifications exist in the same furnace, calculating the heat preservation time according to the maximum thickness;
(3) setting the reversing time: the reversing time is set to be 8min, and the temperature fluctuation of each zone is controlled within +/-10 ℃;
(4) checking equipment: performing equipment point inspection before tempering, wherein the temperature measurement precision of a thermocouple is included, and the temperature difference between the upper space and the lower space of the trolley furnace is not more than 20 ℃;
(5) selecting a cushion block: selecting a group of cushion blocks which are burr-free and bending-free and have the same size, and avoiding scratching the upper surface and the lower surface of the steel plate;
(6) measurement and confirmation of steel sheet: measuring the unevenness of the steel plate before the steel plate enters the furnace, recording a numerical value when the unevenness exceeds a standard measurement unevenness, determining that the steel plate can enter the furnace after the surface has no defects such as serious pits, scratches and the like, and recording a steel loading position;
(7) installing a cushion block: placing the selected cushion blocks into a trolley furnace, wherein the length of the cushion blocks is greater than the width of a steel plate, the cushion blocks on the same layer are arranged in parallel, the distance between every two layers of cushion blocks is not greater than 1500mm, and the height of the cushion block on the lowest layer is greater than that of the cushion blocks on the second layer and above;
(8) placing steel plates, namely, grouping two selected steel plates into a group, stacking each group on the cushion block of each layer, wherein the width and the length of the two steel plates are consistent, aligning the edges and two ends of the steel plates when placing the steel plates, and enabling the edges to be 100 ~ 150mm away from the furnace wall;
(9) tempering treatment: the cushion blocks are arranged in three layers, the total number of the steel plates in the same furnace is not more than 6, and the trolley furnace can be started to carry out tempering treatment after the preparation process is completed.
Further, the fluctuation range of the heating rate was. + -. 5 ℃ per hour.
Further, the fluctuation range of the heat preservation time is +/-10 min.
Further, the upper cushion block and the lower cushion block are ensured to be on the same vertical line.
Further, the height of the cushion block on the lower layer is 300mm, and the height of the cushion block on the second layer and above is 200 mm.
Furthermore, a group of I-shaped steel for supporting is placed at a position 500mm away from the head and the tail of the steel plate.
Compared with the prior art, the invention has the beneficial effects that: the tempering treatment method has the advantages that the structure is simple, the operation is convenient, the yield of each furnace can be increased by tempering, the application of the backing plate can ensure the tempered plate shape, the steel plate is prevented from being wavy and bent, the quality of the tempered steel plate is ensured, the production efficiency is improved, and the production cost is reduced.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus used in the tempering method of the present invention.
Detailed Description
Example 1
In order to make the present invention more clear, a tempering method for processing medium and low temperature wear resistant steel according to the present invention will be further described with reference to the accompanying drawings, and the specific examples described herein are only for explaining the present invention and are not intended to limit the present invention.
Taking NM450 steel as an example, the thickness x is 40mm, and the width is less than 3000mm, which is the effective width of the car-bottom furnace, as can be seen from the following table:
therefore, the holding time of NM450 steel is 8 h.
As shown in figure 1, a tempering method for processing medium-low temperature wear-resistant steel uses a trolley furnace, and has the following specific operation steps:
(1) setting the furnace temperature and the heating speed: the furnace temperature is uniformly set to 180 ℃, and the heating speed is uniformly set to 40 ℃/h;
(2) setting the heat preservation time: from the above table, the heat preservation time is set to be 8h, and if different thickness specifications exist in the same furnace, the heat preservation time is calculated according to the maximum thickness;
(3) setting the reversing time: the reversing time is set to be 8min, and the temperature fluctuation of each zone is controlled within +/-10 ℃;
(4) checking equipment: performing equipment point inspection before tempering, wherein the temperature measurement precision of a thermocouple is included, and the temperature difference between the upper space and the lower space of the trolley furnace is not more than 20 ℃ so as to ensure the accurate and stable temperature control of the equipment;
(5) selecting a cushion block: selecting a group of cushion blocks which are burr-free and bending-free and have the same size, and avoiding scratching the upper surface and the lower surface of the steel plate;
(6) measurement and confirmation of steel sheet: measuring the unevenness of the steel plate before the steel plate enters the furnace, recording a numerical value when the unevenness exceeds a standard measurement unevenness, determining that the steel plate can enter the furnace after the surface has no defects such as serious pits, scratches and the like, and recording a steel loading position;
(7) installing a lower cushion block: placing the selected cushion blocks in a trolley furnace, wherein in order to ensure the shape of a tempered plate, the length of the cushion blocks is greater than the width of a steel plate, the cushion blocks on the same layer are arranged in parallel, the distance between every two layers of cushion blocks is 1000mm, and the height of the cushion block on the lower layer is 300 mm;
(8) placing a first layer of steel plate: two selected steel plates are stacked on a cushion block at the lower layer to form a group, the width and the length of the two steel plates are consistent, the edges and two ends of the steel plates are kept aligned when the steel plates are placed, the distance between the edges and the furnace wall is 125mm, and a group of I-shaped steel for supporting is placed at the position 500mm away from the head and the tail of the steel plates;
(9) installing a middle-layer cushion block: the height of the cushion block at the middle layer is 200mm, a group of cushion blocks at the middle layer are placed on the first layer of steel plate, the arrangement of the cushion blocks is the same as that of the cushion block at the lower layer, and the cushion blocks at the upper layer and the lower layer are required to be ensured on the same vertical line to prevent the steel plate from generating wave breaking and bending;
(10) placing a second layer of steel plate: two selected steel plates are alternatively stacked on the middle-layer base plate, and the arrangement and the size of the second-layer steel plate are the same as those of the first-layer steel plate;
(11) installing a top cushion block: placing a group of cushion blocks on the second layer of steel plate, wherein the size and arrangement of the cushion block on the top layer are the same as those of the cushion block on the middle layer, and the height of the cushion block on the top layer is also 200 mm;
(12) tempering treatment: the cushion blocks are arranged in three layers, the total number of the steel plates in the same furnace is not more than 6, and the trolley furnace can be started to carry out tempering treatment after the preparation process is completed.
In the invention, 2 trolley furnaces are used for calculation, 4 furnaces are produced in the day, the yield of the trolley furnaces is 3 per furnace before the technology is implemented, the maximum yield of the trolley furnaces is 6 per furnace after the technology is implemented, the steel plate is calculated according to 6 tons per furnace, and the monthly economic benefit is as follows: increase tonnage per day per month per day per ton steel price = monthly economic benefit (ten thousand yuan), i.e. (6-3) × 2 × 4 × 6 × 30 × 200=86.4 ten thousand yuan, which saves 1036.8 ten thousand throughout the year. In the aspect of process, the research on variety process is more optimized; simple structure, convenient operation have not only increased output, have guaranteed the quality of back-fire steel sheet, have still improved production efficiency, have reduced manufacturing cost.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (6)
1. A tempering method for processing medium-low temperature wear-resistant steel uses a trolley furnace, and is characterized by comprising the following specific operation steps:
(1) setting the furnace temperature and the heating speed: the furnace temperature is uniformly set to 180 ℃, and the heating speed is uniformly set to 40 ℃/h;
(2) setting the heat preservation time: correspondingly setting the heat preservation time according to different thicknesses of steel grades;
(3) setting the reversing time: the reversing time is set to be 8 min;
(4) checking equipment: performing equipment point inspection before tempering, wherein the temperature measurement precision of a thermocouple is included, and the temperature difference between the upper space and the lower space of the trolley furnace is not more than 20 ℃;
(5) selecting a cushion block: selecting a group of cushion blocks which are burr-free and bending-free and have the same size, and avoiding scratching the upper surface and the lower surface of the steel plate;
(6) measurement and confirmation of steel sheet: measuring the unevenness of the steel plate before the steel plate enters the furnace, recording a numerical value when the unevenness exceeds a standard measurement unevenness, determining that the steel plate can enter the furnace after the surface has no defects such as serious pits, scratches and the like, and recording a steel loading position;
(7) installing a cushion block: placing the selected cushion blocks into a trolley furnace, wherein the length of the cushion blocks is greater than the width of a steel plate, the cushion blocks on the same layer are arranged in parallel, the distance between every two layers of cushion blocks is not more than 1500mm, the height of the cushion block on the lower layer is 300mm, and the height of the cushion blocks on the second layer and above is 200 mm;
(8) placing steel plates, namely, grouping two selected steel plates into a group, stacking each group on the cushion block of each layer, wherein the width and the length of the two steel plates are consistent, aligning the edges and two ends of the steel plates when placing the steel plates, and enabling the edges to be 100 ~ 150mm away from the furnace wall;
(9) tempering treatment: the cushion blocks are arranged in three layers, the total number of the steel plates in the same furnace is not more than 6, and the trolley furnace can be started to carry out tempering treatment after the preparation process is completed.
2. The tempering method for processing medium and low temperature wear resistant steel according to claim 1, wherein:
the upper cushion block and the lower cushion block are ensured to be on the same vertical line.
3. The tempering method for processing medium and low temperature wear resistant steel according to claim 1 or 2, characterized in that:
and a group of I-shaped steel for supporting is arranged at the position 500mm away from the head and the tail of the steel plate.
4. The tempering method for processing medium and low temperature wear resistant steel according to claim 1 or 2, characterized in that:
the fluctuation range of the furnace temperature is +/-10 ℃.
5. The tempering method for processing medium and low temperature wear resistant steel according to claim 1 or 2, characterized in that:
the fluctuation range of the heating speed is +/-5 ℃/h.
6. The tempering method for processing medium and low temperature wear resistant steel according to claim 1 or 2, characterized in that:
the fluctuation range of the heat preservation time is +/-10 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910923056.7A CN110628992A (en) | 2019-09-27 | 2019-09-27 | Tempering method for processing medium-low temperature wear-resistant steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910923056.7A CN110628992A (en) | 2019-09-27 | 2019-09-27 | Tempering method for processing medium-low temperature wear-resistant steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110628992A true CN110628992A (en) | 2019-12-31 |
Family
ID=68974510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910923056.7A Pending CN110628992A (en) | 2019-09-27 | 2019-09-27 | Tempering method for processing medium-low temperature wear-resistant steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110628992A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111254259A (en) * | 2020-03-30 | 2020-06-09 | 南京钢铁股份有限公司 | Efficient tempering production method for thin tempering plate |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103266269A (en) * | 2013-05-15 | 2013-08-28 | 武汉钢铁(集团)公司 | HB500 grade hot continuous rolling high strength wear-resisting steel and production method thereof |
| CN104152666A (en) * | 2014-07-25 | 2014-11-19 | 南京钢铁股份有限公司 | Heat treatment process for producing high-quality die steel in car bottom furnace |
-
2019
- 2019-09-27 CN CN201910923056.7A patent/CN110628992A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103266269A (en) * | 2013-05-15 | 2013-08-28 | 武汉钢铁(集团)公司 | HB500 grade hot continuous rolling high strength wear-resisting steel and production method thereof |
| CN104152666A (en) * | 2014-07-25 | 2014-11-19 | 南京钢铁股份有限公司 | Heat treatment process for producing high-quality die steel in car bottom furnace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111254259A (en) * | 2020-03-30 | 2020-06-09 | 南京钢铁股份有限公司 | Efficient tempering production method for thin tempering plate |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108249743B (en) | Shaping method suitable for drawing flexible glass | |
| CN110344056B (en) | Process for preparing cladding layer on surface of copper matrix by high-speed laser cladding technology | |
| CN108971224A (en) | A kind of checkered steel plate and its production method | |
| CN104152666B (en) | A kind of car type furnace produces the Technology for Heating Processing of high-quality mould steel | |
| CN104513885A (en) | Continuous quenched-tempered heat treatment production line equipment for hardened and tempered steel medium-small bars or tubular stocks | |
| CN110628992A (en) | Tempering method for processing medium-low temperature wear-resistant steel | |
| CN112792126B (en) | Hot rolling method of bearing steel with large compression ratio | |
| CN109513744A (en) | A kind of high carbon tool steel hot-rolling method | |
| CN105149352B (en) | Wrought magnesium alloy Strip mends the method for temperature, constant temperature rolling with batching online | |
| CN101829889B (en) | Production process of austenitic stainless steel bar by short-process continuous casting and rolling | |
| CN102031469B (en) | Method for heating large titanium and titanium alloy slabs | |
| CN202700989U (en) | Hot continuous rolling production line and laminar flow cooling system thereof | |
| CN104624642B (en) | A kind of sputtering target material milling method of big substance wide cut molybdenum plate band | |
| CN101445863B (en) | Method for reducing unevenness of composite stainless steel plates in manufacturing composite steel plates | |
| CN116422696A (en) | Novel high-efficiency double-high-rod production line layout optimization method | |
| CN110153179A (en) | The process of the fiery bearing steel of cooling rolling two | |
| CN101818241A (en) | Heat treatment method of steel bar | |
| CN108405611A (en) | Production method of super-thick homogeneous composite board | |
| CN204281787U (en) | Many groups packaged type induction coil heating apparatus | |
| WO2020177121A1 (en) | Manufacturing method for laser-scribed light guide plate | |
| CN113102505A (en) | Method for manufacturing 301 series austenitic stainless steel for precision rolling | |
| CN112296102B (en) | Control method and control device for low-temperature heating of non-oriented silicon steel plate blank | |
| JP2001353564A (en) | Method for producing steel plate | |
| CN111647843A (en) | Composite heat treatment process for manufacturing hollow brick mold by using plate | |
| CN110885922A (en) | Method for manufacturing high-grade corrosion-resistant alloy cold-rolled thin material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191231 |