CN111139349A - Method for improving heat treatment yield and quality of large-thickness wear-resistant steel plate - Google Patents
Method for improving heat treatment yield and quality of large-thickness wear-resistant steel plate Download PDFInfo
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- CN111139349A CN111139349A CN202010029292.7A CN202010029292A CN111139349A CN 111139349 A CN111139349 A CN 111139349A CN 202010029292 A CN202010029292 A CN 202010029292A CN 111139349 A CN111139349 A CN 111139349A
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- thickness
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 142
- 239000010959 steel Substances 0.000 title claims abstract description 142
- 238000010438 heat treatment Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000004321 preservation Methods 0.000 claims abstract description 30
- 238000005496 tempering Methods 0.000 claims abstract description 26
- 238000005422 blasting Methods 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000007689 inspection Methods 0.000 claims abstract description 3
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000005192 partition Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 239000004576 sand Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- 238000005336 cracking Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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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
- 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
-
- 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
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- 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 Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
The invention discloses a method for improving the heat treatment yield and quality of a large-thickness wear-resistant steel plate, which comprises the following steps of performing shot blasting on the steel plate through a shot blasting machine, putting the steel plate into a heat treatment furnace for tempering, putting the steel plate into a heat preservation box for cooling, storing or selling the steel plate after the steel plate is qualified through inspection, and the like. The invention has the advantages of improving the working efficiency and ensuring the product quality.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a method for improving the heat treatment yield and quality of a large-thickness wear-resistant steel plate.
Background
The heat treatment tempering is an important process for producing the wear-resistant steel plate, the heat treatment of the wear-resistant steel plate consists of quenching and low-temperature tempering, the quenching is mainly used for obtaining a complete martensite structure, the low-temperature tempering is used for eliminating the structure stress and the thermal stress generated by the quenching, a roller hearth type heat treatment furnace is used in a heat treatment workshop of a medium plate factory, the low-temperature tempering temperature of the wear-resistant steel plate is generally about 250 ℃, the tempered martensite is formed after the steel plate is tempered, the phase change is not generated in the process, the low-temperature tempering time of the steel plate in the furnace is very long, the process time parameter is generally selected to be 4-5 min/mm, therefore, the large-thickness steel plate with the thickness of 40-80 mm is in the furnace for 160-400 min, and the production efficiency of the heat treatment.
In the prior art, for example, patent No. CN201711072559.5, entitled as a heat treatment process of low-alloy wear-resistant steel, a steel material is heated to 820 to 880 ℃ for austenitizing treatment, then the steel material is subjected to carbon partition treatment at a temperature 330 to 390 ℃ higher than the Ms point, and finally the steel material is subjected to tempering treatment.
However, in actual production, the thickness of the steel plate is thick, the heat dissipation is slow, if the steel plate is placed outdoors to directly dissipate heat, the temperature on the surface of the steel plate is reduced firstly, the temperature inside the steel plate is reduced later, and the steel plate is easy to crack due to the expansion caused by heat and the contraction caused by cold during heat dissipation, so that the quality problem exists.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for improving the heat treatment yield and quality of a large-thickness wear-resistant steel plate, which has the advantages of improving the heat treatment efficiency of the steel plate, ensuring the quality of the steel plate and the like, and solves the problem of lower working efficiency of a common heat treatment method.
The invention aims to solve the problems and designs a method for improving the heat treatment yield and quality of the large-thickness wear-resistant steel plate.
The technical scheme of the invention is that the method for improving the heat treatment yield and quality of the large-thickness wear-resistant steel plate comprises the following steps:
step one, shot blasting: placing the quenched steel plate on a transmission roller on a shot blasting machine, transferring the steel plate from one side of the shot blasting machine to the other side through the rotation of the transmission roller, and spraying steel sand on the upper surface of the steel plate through the shot blasting machine to treat the surface of the steel plate;
step two, selecting a tempering process: setting the temperature of the continuous roller hearth type heat treatment furnace between 240 ℃ and 260 ℃, and selecting tempering time according to the thickness of the steel plate, wherein the tempering time coefficient is 2.5 min/mm;
step three, tempering: placing a steel plate on a driving roller on the continuous roller hearth type heat treatment furnace, moving the steel plate into the continuous roller hearth type heat treatment furnace through the rotation of the driving roller, tempering, and placing a new steel plate on the driving roller on the continuous roller hearth type heat treatment furnace again during tempering;
step four, cooling: opening a heat preservation cover on the side surface of the heat preservation box, placing a rotating rod on the front side of the heat preservation box, placing a tempered steel plate on the rotating rod by using hoisting equipment, longitudinally placing the steel plate in the heat preservation box through mechanical equipment for cooling, covering the heat preservation cover when the steel plate enters the heat preservation box, and slowly cooling the steel plate in the heat preservation box for more than 48 hours to ensure that the temperature of the steel plate is reduced to be below 80 ℃, and taking out the steel plate;
step five, checking: cutting off a plurality of small blocks of the steel plate by using a flame cutting machine, sampling, carrying out hardness detection on the steel plate, observing whether cracks exist on the surface of the steel plate, and storing or selling the steel plate after the steel plate is qualified through inspection.
The chemical components of the wear-resistant steel plate used in the method meet the national standard requirements, and the thickness of the wear-resistant steel plate is between 40mm and 80 mm.
And in the first step, after the shot blasting is finished on one side of the steel plate, the steel plate is turned over, and shot blasting is carried out on the other side of the steel plate.
And in the third step, a partition plate is arranged in the heat preservation box through bolts according to the thickness of the steel plate, and after the steel plate is placed in the heat preservation box, the steel plate is fixed and separated through the partition plate.
The invention provides a method for improving the heat treatment yield and quality of a large-thickness wear-resistant steel plate, which has the following beneficial effects that the steel plate is placed on one side of a continuous roller hearth type heat treatment furnace, so that the steel plate can be placed in a new steel plate while being tempered, after the steel plate is tempered, the steel plate is taken out and placed in the new steel plate, the steel plate can be continuously tempered, the working efficiency is improved, the steel plate is placed in a heat preservation box and covered with a heat preservation cover, the steel plate can be slowly cooled, the temperature difference between the inside and the outside of the steel plate cannot be too large, the quality of the steel plate can be ensured, the steel plate is placed in the heat preservation box from one side, the resistance when the steel plate is placed can be reduced, and the working efficiency of the heat treatment of the.
Drawings
FIG. 1 is a schematic flow chart of the method for improving the heat treatment yield and quality of the large-thickness wear-resistant steel plate.
Detailed Description
The invention is described in detail below with reference to the drawings, as shown in fig. 1.
In the embodiment, the method for improving the heat treatment yield and quality of the large-thickness wear-resistant steel plate comprises the steps of treating the surface of the steel plate by using a shot blasting machine after the steel plate is quenched to enable the surface of the steel plate to be smooth, placing the steel plate on a driving roller on a continuous roller bottom type heat treatment furnace, setting the temperature of the continuous roller bottom type heat treatment furnace to be 240-260 ℃, setting the tempering time to be 2.5min/mm, pushing the steel plate into the continuous roller bottom type heat treatment furnace for tempering, placing a new steel plate on the driving roller, taking the steel plate out after the steel plate in the continuous roller bottom type heat treatment furnace is tempered, placing the new steel plate for continuously tempering, placing the tempered steel plate into an insulation box for cooling, and after the temperature is reduced, cutting by using a flame cutting machine, and checking.
The invention is further described with reference to the following examples.
Example 1: method for improving heat treatment yield and quality of 40mm large-thickness wear-resistant steel plate
(1) The NM400 steel plate has the specification of 40mm, and the steel plate is subjected to shot blasting treatment after quenching by batch number 19E 080378;
(2) selecting a tempering process, wherein the furnace temperature is as follows: 250 +/-10 ℃ and in-furnace time coefficient: 2.5 min/mm;
(3) continuously loading the steel plate into a roller hearth furnace according to the process for tempering;
(4) discharging the tempered steel plate out of the furnace within 100min of furnace time, wherein the surface temperature of the steel plate is 210 ℃, quickly collecting the steel plate, putting the steel plate into a heat preservation box from the side surface, and covering a heat preservation cover;
(5) placing the steel plates in the heat preservation box side by side for slow cooling for 48h, and discharging the steel plates out of the heat preservation box at the temperature of 78 ℃;
(6) the steel plate is cut by flame with temperature and sampled without cracking; and (3) performance test: the hardness HB425.6, 421.9, 426.9(HB 10/3000) is qualified; the steel plate has no self-cracking and crack after being stored in a finished product warehouse;
(7) and (4) delivering the steel plates to leave the factory after being qualified.
Example 2: method for improving heat treatment yield and quality of 80mm large-thickness wear-resistant steel plate
(1) The NM500 steel plate is 80mm in specification, and shot blasting treatment is carried out on the steel plate after quenching in batch number 19E 47828;
(2) selecting a tempering process, wherein the furnace temperature is as follows: 250 +/-10 ℃ and in-furnace time coefficient: 3.0 min/mm;
(3) continuously loading the steel plate into a roller hearth furnace according to the process for tempering;
(4) discharging the tempered steel plate out of the furnace within 200min, wherein the surface temperature of the steel plate is 240 ℃, quickly collecting the steel plate, putting the steel plate into a heat preservation box from the side surface, and covering a heat preservation cover;
(5) placing the steel plates in the heat preservation box side by side for slow cooling for 72h, and discharging the steel plates out of the heat preservation box at the temperature of 70 ℃;
(6) the steel plate is cut by flame with temperature and sampled without cracking; and (3) performance test: the hardness HB545.7, 534.6 and 538.0(HB 10/3000) are qualified; the steel plate has no self-cracking and crack after being stored in a finished product warehouse;
(7) and (4) delivering the steel plates to leave the factory after being qualified.
The technical solutions described above only represent the preferred technical solutions of the present invention, and some possible modifications to some parts of the technical solutions by those skilled in the art all represent the principles of the present invention, and fall within the protection scope of the present invention.
Claims (4)
1. The method for improving the heat treatment yield and quality of the large-thickness wear-resistant steel plate is characterized by comprising the following steps of:
step one, shot blasting: placing the quenched steel plate on a transmission roller on a shot blasting machine, transferring the steel plate from one side of the shot blasting machine to the other side through the rotation of the transmission roller, and spraying steel sand on the upper surface of the steel plate through the shot blasting machine to treat the surface of the steel plate;
step two, selecting a tempering process: setting the temperature of the continuous roller hearth type heat treatment furnace between 240 ℃ and 260 ℃, and selecting tempering time according to the thickness of the steel plate, wherein the tempering time coefficient is 2.5 min/mm;
step three, tempering: placing a steel plate on a driving roller on the continuous roller hearth type heat treatment furnace, moving the steel plate into the continuous roller hearth type heat treatment furnace through the rotation of the driving roller, tempering, and placing a new steel plate on the driving roller on the continuous roller hearth type heat treatment furnace again during tempering;
step four, cooling: opening a heat preservation cover on the side surface of the heat preservation box, placing a rotating rod on the front side of the heat preservation box, placing a tempered steel plate on the rotating rod by using hoisting equipment, longitudinally placing the steel plate in the heat preservation box through mechanical equipment for cooling, covering the heat preservation cover when the steel plate enters the heat preservation box, and slowly cooling the steel plate in the heat preservation box for more than 48 hours to ensure that the temperature of the steel plate is reduced to be below 80 ℃, and taking out the steel plate;
step five, checking: cutting off a plurality of small blocks of the steel plate by using a flame cutting machine, sampling, carrying out hardness detection on the steel plate, observing whether cracks exist on the surface of the steel plate, and storing or selling the steel plate after the steel plate is qualified through inspection.
2. The method for improving the heat treatment yield and quality of the large-thickness wear-resistant steel plate according to claim 1, wherein the chemical composition of the wear-resistant steel plate used in the method meets the national standard, and the thickness of the wear-resistant steel plate is between 40mm and 80 mm.
3. The method for improving the heat treatment yield and quality of the large-thickness wear-resistant steel plate according to claim 1, wherein in the first step, after the shot blasting is finished on one surface of the steel plate, the steel plate is turned over, and the shot blasting is carried out on the other surface of the steel plate.
4. The method for improving the heat treatment yield and quality of the large-thickness wear-resistant steel plate according to claim 1, wherein in the third step, a partition plate is installed in the heat preservation box through bolts according to the thickness of the steel plate, and after the steel plate is placed in the heat preservation box, the steel plate is fixed and separated through the partition plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010029292.7A CN111139349A (en) | 2020-01-13 | 2020-01-13 | Method for improving heat treatment yield and quality of large-thickness wear-resistant steel plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010029292.7A CN111139349A (en) | 2020-01-13 | 2020-01-13 | Method for improving heat treatment yield and quality of large-thickness wear-resistant steel plate |
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| CN111139349A true CN111139349A (en) | 2020-05-12 |
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| CN202010029292.7A Pending CN111139349A (en) | 2020-01-13 | 2020-01-13 | Method for improving heat treatment yield and quality of large-thickness wear-resistant steel plate |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268520A (en) * | 2011-07-28 | 2011-12-07 | 山西太钢不锈钢股份有限公司 | Heat treatment method for high-strength wear-resistant steel plates |
| CN109280852A (en) * | 2018-11-12 | 2019-01-29 | 南京钢铁股份有限公司 | A kind of big thickness NM500 abrasion-resistant stee and production method |
| WO2019128286A1 (en) * | 2017-12-25 | 2019-07-04 | 南京钢铁股份有限公司 | Method for fabricating low-cost, short-production-cycle wear-resistant steel |
| US20190309384A1 (en) * | 2016-04-19 | 2019-10-10 | Jfe Steel Corporation | Abrasion-resistant steel plate and method of producing abrasion-resistant steel plate |
| CN110607429A (en) * | 2019-09-27 | 2019-12-24 | 中冶南方（武汉）热工有限公司 | Roller hearth type plate continuous furnace and tempering method thereof |
-
2020
- 2020-01-13 CN CN202010029292.7A patent/CN111139349A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268520A (en) * | 2011-07-28 | 2011-12-07 | 山西太钢不锈钢股份有限公司 | Heat treatment method for high-strength wear-resistant steel plates |
| US20190309384A1 (en) * | 2016-04-19 | 2019-10-10 | Jfe Steel Corporation | Abrasion-resistant steel plate and method of producing abrasion-resistant steel plate |
| WO2019128286A1 (en) * | 2017-12-25 | 2019-07-04 | 南京钢铁股份有限公司 | Method for fabricating low-cost, short-production-cycle wear-resistant steel |
| CN109280852A (en) * | 2018-11-12 | 2019-01-29 | 南京钢铁股份有限公司 | A kind of big thickness NM500 abrasion-resistant stee and production method |
| CN110607429A (en) * | 2019-09-27 | 2019-12-24 | 中冶南方（武汉）热工有限公司 | Roller hearth type plate continuous furnace and tempering method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 吴会亮: "回火工艺对NM400耐磨钢组织与性能的影响" * |
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