CN112941273A - Heat treatment process of hot-rolled round steel for coupler yoke - Google Patents
Heat treatment process of hot-rolled round steel for coupler yoke Download PDFInfo
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- CN112941273A CN112941273A CN202110231364.0A CN202110231364A CN112941273A CN 112941273 A CN112941273 A CN 112941273A CN 202110231364 A CN202110231364 A CN 202110231364A CN 112941273 A CN112941273 A CN 112941273A
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- round steel
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 94
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 49
- 239000010959 steel Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000008569 process Effects 0.000 title claims abstract description 20
- 239000000523 sample Substances 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000010791 quenching Methods 0.000 claims abstract description 24
- 230000000171 quenching effect Effects 0.000 claims abstract description 24
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 17
- 150000002910 rare earth metals Chemical group 0.000 claims abstract description 17
- 239000012496 blank sample Substances 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 238000005496 tempering Methods 0.000 claims abstract description 11
- 238000003754 machining Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000004321 preservation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
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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 Treatment Of Steel (AREA)
Abstract
The invention discloses a heat treatment process of hot rolled round steel for a coupler yoke, wherein the used heat treatment sample is rare earth microalloyed 25MnCrNiMoA hot rolled round steel for the coupler yoke, and the heat treatment is carried out according to the following steps: (1) quenching: placing the roughly processed rare earth microalloyed 25MnCrNiMoA coupler yoke into a heating furnace by using a hot rolled round steel blank sample, heating to 880-910 ℃, preserving heat for 50min, and then quenching by using water; (2) tempering: and (3) putting the quenched sample into a heating furnace, heating to 580 +/-20 ℃, preserving the heat for 90min, taking out the sample, and carrying out water cooling. The invention aims to provide a heat treatment process of hot-rolled round steel for a coupler yoke, so that the hot-rolled round steel has good comprehensive mechanical properties, low-temperature impact toughness and hardenability, and the overall service life and safety of the steel for the coupler yoke are obviously prolonged.
Description
Technical Field
The invention relates to the field of manufacturing of hot-rolled round steel for a coupler yoke, in particular to a heat treatment process of the hot-rolled round steel for the coupler yoke.
Background
The coupler yoke is an important part in a coupler buffer device of a railway vehicle. The reliability of the coupler yoke under severe use conditions can be met only by ensuring that the coupler yoke has enough strength and low-temperature impact energy. The rolled rare earth microalloyed 25MnCrNiMoA hook tail frame uses hot rolled round steel with pearlite and a small amount of ferrite as the structure. The strength and toughness cannot meet the use requirements, and the strength and low-temperature toughness must be improved by austenitizing through heat treatment. Therefore, it is very important to establish a proper heat treatment process to ensure that the rare earth microalloyed hot-rolled round steel for the 25MnCrNiMoA hook tail frame has good performance. Through research on the phase transition point of the hot rolled round steel for the rare earth microalloyed 25MnCrNiMoA hook tail frame, the heat treatment austenitizing temperature of the hot rolled round steel for the rare earth microalloyed 25MnCrNiMoA hook tail frame is preferably controlled to be 880-910 ℃, and water with higher cooling speed is selected as a quenching medium, so that high strength and high hardness can be obtained. The tempering temperature should preferably be controlled at about 580 ℃. The tempering temperature has great influence on the performance of the material, the strength and the hardness of the material are reduced along with the improvement of the tempering temperature, the plasticity and the toughness are improved, and the material has better comprehensive mechanical property at about 580 ℃.
Disclosure of Invention
The invention aims to provide a heat treatment process of hot-rolled round steel for a coupler yoke, so that the hot-rolled round steel has good comprehensive mechanical properties, low-temperature impact toughness and hardenability, and the overall service life and safety of the steel for the coupler yoke are obviously prolonged.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a heat treatment process of hot-rolled round steel for a coupler yoke, which comprises the following steps:
(1) quenching: putting the hook tail frame after rough machining into a heating furnace by using a hot rolled round steel blank sample, heating to 880-910 ℃, preserving heat for 50min, and then quenching by using water;
(2) tempering: and (3) putting the quenched sample into a heating furnace, heating to 580 +/-20 ℃, preserving the heat for 90min, taking out the sample, and carrying out water cooling.
Furthermore, the hot rolled round steel for the coupler tail frame is rare earth micro-alloyed 25MnCrNiMoA hot rolled round steel for the coupler tail frame.
Further, placing the roughly processed rare earth microalloyed 25MnCrNiMoA hook tail frame into a heating furnace by using a hot rolled round steel blank sample, heating to 880 ℃, preserving heat for 50min, and then quenching by using water; and (3) putting the quenched sample into a heating furnace, heating to 580 ℃, preserving heat for 90min, taking out the sample, and carrying out water cooling.
Further, placing the roughly processed rare earth microalloyed 25MnCrNiMoA hook tail frame into a heating furnace by using a hot rolled round steel blank sample, heating to 890 ℃, preserving heat for 50min, and then quenching by using water; and (3) putting the quenched sample into a heating furnace, heating to 590 ℃, preserving the heat for 90min, taking out the sample, and carrying out water cooling.
Further, placing the roughly processed rare earth microalloyed 25MnCrNiMoA hook tail frame into a heating furnace by using a hot rolled round steel blank sample, heating to 910 ℃, preserving heat for 50min, and then quenching by using water; and (3) putting the quenched sample into a heating furnace, heating to 600 ℃, preserving heat for 90min, taking out the sample, and carrying out water cooling.
Further, the mechanical properties of the hot-rolled round steel for the hook tail frame after heat treatment are as follows: the yield strength is more than or equal to 850MPa, the tensile strength is more than or equal to 950MPa, the elongation is more than or equal to 16 percent, and the reduction of area is more than or equal to 55 percent; the impact value KV2 at minus 40 ℃ is more than or equal to 50J, and various non-metallic inclusions are less than or equal to 1.5 grade; when the C is less than or equal to 0.25 percent, the hardness value at the position 11mm away from the quenching end face is more than or equal to 30HRC, and when the C is more than or equal to 0.28 percent and more than or equal to 0.25 percent, the hardness value at the position 11mm away from the quenching end face is more than or equal to 33 HRC.
Compared with the prior art, the invention has the beneficial technical effects that:
(1) according to the heat treatment process of the hot rolled round steel for the coupler yoke, a set of heat treatment system capable of ensuring the stability of steel is determined by researching the influence of a heat treatment heating system including quenching temperature, tempering temperature, heat preservation time and the like on the structure and the performance; (2) the invention solves the problem of large performance fluctuation after heat treatment caused by large temperature range of the original heat treatment system; (3) on the premise of ensuring the structure and performance after heat treatment, the invention reduces the heating temperature range, reduces the heat preservation time, reduces the energy consumption of heat treatment and improves the efficiency of heat treatment.
Performing mechanical property inspection on the heat-treated sample, wherein the yield strength is more than or equal to 850MPa, the tensile strength is more than or equal to 950MPa, the elongation is more than or equal to 16%, and the reduction of area is more than or equal to 55%; the impact value KV2 at minus 40 ℃ is more than or equal to 50J, and various non-metallic inclusions are less than or equal to 1.5 grade; when the C is less than or equal to 0.25 percent, the hardness value at the position 11mm away from the quenching end face is more than or equal to 30HRC, and when the C is more than or equal to 0.28 percent and more than or equal to 0.25 percent, the hardness value at the position 11mm away from the quenching end face is more than or equal to 33 HRC.
Detailed Description
The heat treatment process of the hot rolled round steel for hook tail frame of the present invention will be described in further detail below.
Example 1:
the heat treatment process of the invention comprises the following steps that the steel part is hot-rolled round steel for a rare earth microalloyed 25MnCrNiMoA coupler yoke:
(1) quenching: placing the hook tail frame subjected to rough machining into a heating furnace by using a hot rolled round steel blank sample, heating to 880 ℃, preserving heat for 50min, and then quenching by using water;
(2) tempering: and (3) putting the quenched sample into a heating furnace, heating to 580 ℃, preserving heat for 90min, taking out the sample, and carrying out water cooling.
Example 2:
the heat treatment process of the invention comprises the following steps that the steel part is hot-rolled round steel for a rare earth microalloyed 25MnCrNiMoA coupler yoke:
(1) quenching: putting the hook tail frame subjected to rough machining into a heating furnace by using a hot rolled round steel blank sample, heating to 890 ℃, preserving heat for 50min, and then quenching by using water;
(2) tempering: and (3) putting the quenched sample into a heating furnace, heating to 590 ℃, preserving the heat for 90min, taking out the sample, and carrying out water cooling.
Example 3:
the heat treatment process of the invention comprises the following steps that the steel part is hot-rolled round steel for a rare earth microalloyed 25MnCrNiMoA coupler yoke:
(1) quenching: putting the hook tail frame subjected to rough machining into a heating furnace by using a hot rolled round steel blank sample, heating to 910 ℃, preserving heat for 50min, and then quenching by using water;
(2) tempering: and (3) putting the quenched sample into a heating furnace, heating to 600 ℃, preserving heat for 90min, taking out the sample, and carrying out water cooling.
After the heat treatment, the rough machined blank sample is subjected to finish machining, and various performance tests are carried out, wherein the test results are shown in tables 1, 2 and 3. As can be seen from tables 1, 2 and 3, the performance indexes are all higher than the index requirements, and the performance of the sample after heat treatment is qualified.
TABLE 1 mechanical Properties after Heat treatment
TABLE 2 non-metallic inclusions and grain size after Heat treatment
TABLE 3 terminal hardenability after Heat treatment
According to the heat treatment process of the hot rolled round steel for the coupler yoke, a set of heat treatment system capable of ensuring the stability of steel is determined by researching the influence of a heat treatment heating system including quenching temperature, tempering temperature, heat preservation time and the like on the structure and the performance; the problem of large performance fluctuation after heat treatment caused by large temperature range of the original heat treatment system is solved; on the premise of ensuring the structure and performance after heat treatment, the heating temperature range is narrowed, the heat preservation time is shortened, the energy consumption of the heat treatment is reduced, and the heat treatment efficiency is improved.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (6)
1. A heat treatment process of hot-rolled round steel for a coupler yoke is characterized by comprising the following steps:
(1) quenching: putting the hook tail frame after rough machining into a heating furnace by using a hot rolled round steel blank sample, heating to 880-910 ℃, preserving heat for 50min, and then quenching by using water;
(2) tempering: and (3) putting the quenched sample into a heating furnace, heating to 580 +/-20 ℃, preserving the heat for 90min, taking out the sample, and carrying out water cooling.
2. The heat treatment process of the hot-rolled round steel for the coupler tail frame according to claim 1, wherein the hot-rolled round steel for the coupler tail frame is rare earth micro-alloyed 25MnCrNiMoA hot-rolled round steel for the coupler tail frame.
3. The heat treatment process of the hot rolled round steel for the coupler tail frame according to claim 2, characterized in that a rough-machined rare earth microalloyed 25MnCrNiMoA coupler tail frame blank sample is put into a heating furnace, heated to 880 ℃, kept for 50min, and then quenched with water; and (3) putting the quenched sample into a heating furnace, heating to 580 ℃, preserving heat for 90min, taking out the sample, and carrying out water cooling.
4. The heat treatment process of the hot-rolled round steel for the coupler tail frame according to claim 2, characterized in that a rough-machined rare earth microalloyed 25MnCrNiMoA coupler tail frame blank sample is put into a heating furnace, heated to 890 ℃, kept for 50min, and then quenched with water; and (3) putting the quenched sample into a heating furnace, heating to 590 ℃, preserving the heat for 90min, taking out the sample, and carrying out water cooling.
5. The heat treatment process of the hot rolled round steel for the coupler tail frame according to claim 2, characterized in that a rough-machined rare earth microalloyed 25MnCrNiMoA coupler tail frame blank sample is put into a heating furnace, heated to 910 ℃, kept for 50min, and then quenched with water; and (3) putting the quenched sample into a heating furnace, heating to 600 ℃, preserving heat for 90min, taking out the sample, and carrying out water cooling.
6. The heat treatment process of the hot-rolled round steel for the coupler tail frame according to any one of claims 1 to 5, wherein the mechanical properties of the hot-rolled round steel for the coupler tail frame after heat treatment are as follows: the yield strength is more than or equal to 850MPa, the tensile strength is more than or equal to 950MPa, the elongation is more than or equal to 16 percent, and the reduction of area is more than or equal to 55 percent; the impact value KV2 at minus 40 ℃ is more than or equal to 50J, and various non-metallic inclusions are less than or equal to 1.5 grade; when the C is less than or equal to 0.25 percent, the hardness value at the position 11mm away from the quenching end face is more than or equal to 30HRC, and when the C is more than or equal to 0.28 percent and more than or equal to 0.25 percent, the hardness value at the position 11mm away from the quenching end face is more than or equal to 33 HRC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110231364.0A CN112941273A (en) | 2021-03-02 | 2021-03-02 | Heat treatment process of hot-rolled round steel for coupler yoke |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110231364.0A CN112941273A (en) | 2021-03-02 | 2021-03-02 | Heat treatment process of hot-rolled round steel for coupler yoke |
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| CN112941273A true CN112941273A (en) | 2021-06-11 |
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| CN202110231364.0A Pending CN112941273A (en) | 2021-03-02 | 2021-03-02 | Heat treatment process of hot-rolled round steel for coupler yoke |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103614651A (en) * | 2013-11-27 | 2014-03-05 | 内蒙古包钢钢联股份有限公司 | Steel for coupler yoke of railway vehicle and heat treatment process of steel |
| CN104148783A (en) * | 2014-07-31 | 2014-11-19 | 南京力源锻造有限公司 | Forged coupler yoke manufacturing method |
| CN110453134A (en) * | 2019-08-28 | 2019-11-15 | 山东钢铁股份有限公司 | A kind of high-strength tenacity locomotive couple yoke steel and preparation method thereof |
| CN111485167A (en) * | 2020-03-26 | 2020-08-04 | 包头钢铁（集团）有限责任公司 | Hot-rolled round steel for rare earth microalloyed 25MnCrNiMoA coupler yoke and production method thereof |
-
2021
- 2021-03-02 CN CN202110231364.0A patent/CN112941273A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103614651A (en) * | 2013-11-27 | 2014-03-05 | 内蒙古包钢钢联股份有限公司 | Steel for coupler yoke of railway vehicle and heat treatment process of steel |
| CN104148783A (en) * | 2014-07-31 | 2014-11-19 | 南京力源锻造有限公司 | Forged coupler yoke manufacturing method |
| CN110453134A (en) * | 2019-08-28 | 2019-11-15 | 山东钢铁股份有限公司 | A kind of high-strength tenacity locomotive couple yoke steel and preparation method thereof |
| CN111485167A (en) * | 2020-03-26 | 2020-08-04 | 包头钢铁（集团）有限责任公司 | Hot-rolled round steel for rare earth microalloyed 25MnCrNiMoA coupler yoke and production method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 仲晖: "25MnNiCrMoA钢热处理工艺分析", 《装备制造技术》 * |
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Application publication date: 20210611 |