CN114277222A - Heat treatment method of Mn-Ni-Cr-Mo-Nb steel plate - Google Patents
Heat treatment method of Mn-Ni-Cr-Mo-Nb steel plate Download PDFInfo
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- CN114277222A CN114277222A CN202111573251.5A CN202111573251A CN114277222A CN 114277222 A CN114277222 A CN 114277222A CN 202111573251 A CN202111573251 A CN 202111573251A CN 114277222 A CN114277222 A CN 114277222A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 71
- 239000010959 steel Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000010438 heat treatment Methods 0.000 title claims abstract description 31
- 238000010791 quenching Methods 0.000 claims abstract description 57
- 230000000171 quenching effect Effects 0.000 claims abstract description 53
- 238000001816 cooling Methods 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000005496 tempering Methods 0.000 claims abstract description 13
- 238000007599 discharging Methods 0.000 claims abstract description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052758 niobium Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 6
- 229910052737 gold Inorganic materials 0.000 description 6
- 239000010931 gold Substances 0.000 description 6
- 238000010587 phase diagram Methods 0.000 description 6
- 238000004321 preservation Methods 0.000 description 6
- 238000009749 continuous casting Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011009 performance qualification Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
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Abstract
The invention discloses a heat treatment method of a Mn-Ni-Cr-Mo-Nb steel plate, which comprises the steps of sequentially carrying out primary quenching, secondary quenching and tempering treatment on the steel plate, wherein the primary quenching is carried out at the quenching temperature of 895-920 ℃, and the cooling mode is water cooling; the second quenching is carried out, wherein the quenching temperature is 830-845 ℃, and the cooling mode is water cooling; the tempering temperature is 650-670 ℃, and the cooling mode is discharging and air cooling. The steel plate obtained by the method provided by the invention has excellent low-temperature impact toughness.
Description
Technical Field
The invention belongs to the technical field of steel plate production, and particularly relates to a heat treatment method of a Mn-Ni-Cr-Mo-Nb steel plate.
Background
In order to solve the technical barrier restricting the internal quality of the large-thickness ultra-wide plate, the performance qualification rate of the steel plate is obviously improved, and the fine-grained steel plate with the thickness of 1/2 ℃ below zero and excellent low-temperature impact toughness can be produced according to the special requirements of users, so that the special performance use requirements of industrialized key equipment are met. Because the thickness of the steel plate is large, the internal quality of a casting blank can not completely meet the requirement of low-temperature impact performance of 1/2-20 ℃ at the plate thickness during smelting, the rolling force can not effectively permeate into the core during rolling of the steel plate, the core structure is coarse, and the core segregation can not be effectively improved, so that innovation needs to be carried out in a heat treatment process, the quality of the core of the steel plate is improved, and the performance qualified rate of the steel plate is improved.
Disclosure of Invention
The invention aims to provide a heat treatment method of a Mn-Ni-Cr-Mo-Nb steel plate, and the steel plate obtained by the method has good strength and toughness matching, uniform and stable performance.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a heat treatment method of a Mn-Ni-Cr-Mo-Nb steel plate comprises the steps of sequentially carrying out primary quenching, secondary quenching and tempering treatment on the steel plate, wherein the primary quenching is carried out at the quenching temperature of 895-920 ℃, and the cooling mode is water cooling; the second quenching is carried out, wherein the quenching temperature is 830-845 ℃, and the cooling mode is water cooling; the tempering temperature is 650-670 ℃, and the cooling mode is discharging and air cooling.
Further, in the first quenching and heating process, the temperature of the steel plate is quickly raised to 825-835 ℃ at the average temperature rise speed of 6-7 ℃/min, then is raised to 895-920 ℃ at 1.5-2.5 ℃/min, and is kept for 180-210 min.
Furthermore, in the first quenching cooling process, the initial temperature of the first quenching is 885-910 ℃, a roll-press type quenching machine is adopted for rapid water cooling, the water temperature is 25-27 ℃, and the instantaneous flow of a high-pressure section is 4650m3/h -4700m3H, high pressure section pressure of 0.93-0.96 Mpa, high pressure section roller speed of 1.8-2.2m/min, and low pressure section instantaneous flow rate of 4500m3/h -4520m3The pressure of the low-pressure section is 0.50-0.52 Mpa, and the steel plate of the low-pressure section swings for 20-30 min.
Further, in the second quenching and heating process, the temperature of the steel plate is rapidly increased to 815-825 ℃ at the average temperature increase speed of 6-7 ℃/min, then is increased to 830-845 ℃ at 1-1.5 ℃/min, and is kept for 180-210 min.
Furthermore, in the second quenching cooling process, the starting temperature of the second quenching is 820-838 ℃, a roll-pressing type quenching machine is adopted for rapid water cooling, the water temperature is 25-27 ℃, and the instantaneous flow of a high-pressure section is 4650m3/h -4700m3H, high pressure section pressure 0.93MPa-0.96Mpa, high pressure section roller speed 1.8-2.2m/min, low pressure section instantaneous flow 4500m3/h -4520m3The pressure of the low-pressure section is 0.50-0.52 Mpa, and the steel plate of the low-pressure section swings for 20-30 min.
Further, in the tempering and heating process, the temperature of the steel plate is rapidly raised to 350-400 ℃ at an average temperature rise speed of 5-6 ℃/min, then raised to 650-670 ℃ at 0.9-1.2 ℃/min, and kept for 385-415 min.
The steel plate comprises the following components in percentage by mass: 0.12-0.14%, Mn: 1.3% -1.4%, Ni: 0.65% -0.70%, Cr: 0.32% -0.36%, Mo: 0.26-0.30%, Nb: 0.015 to 0.020 percent, and the balance of Fe and inevitable impurity elements.
The steel plate blank is a continuous casting billet, the section of the continuous casting billet is 330mm multiplied by 2500mm, and the specification of the production steel plate is (100 plus 110) mm multiplied by (2300 plus 2800) mm multiplied by (8000 plus 12000) mm.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the method provided by the invention can be used for producing a steel plate with the thickness of 100-.
The method has the characteristics of simple process, stable product quality and capability of realizing batch production.
Drawings
Fig. 1 and 2 are gold phase diagrams of steel plates prepared in example 1 under different multiples.
Fig. 3 and 4 are gold phase diagrams of the steel plates prepared in example 2 under different multiples.
Fig. 5 and 6 are gold phase diagrams of the steel sheets prepared in example 3 under different multiples.
Fig. 7 and 8 are gold phase diagrams of the steel sheets prepared in example 4 under different magnification.
Fig. 9 and 10 are gold phase diagrams of the steel sheets prepared in example 5 under different magnification.
Fig. 11 and 12 are gold phase diagrams of the steel sheets prepared in example 6 under different magnification.
Detailed Description
The present invention will be described in further detail with reference to the following examples.
The invention provides a heat treatment method of a Mn-Ni-Cr-Mo-Nb steel plate, which comprises the steps of sequentially carrying out primary quenching, secondary quenching and tempering treatment on the steel plate, wherein the primary quenching is carried out, the quenching temperature is 895-; quenching for the second time, wherein the quenching temperature is 830-845 ℃, and the cooling mode is water cooling; tempering at 650-670 deg.C, and cooling by air cooling.
In the first quenching heating process, the temperature of the steel plate is rapidly raised to 825-835 ℃ at the average temperature rise speed of 6-7 ℃/min, then is raised to 895-920 ℃ at 1.5-2.5 ℃/min, and is kept for 180-210 min. The first quenching cooling process is carried out at the quenching starting temperature of 885-910 ℃ by adopting a roll-press type quenching machine for rapid water cooling, the water temperature is 25-27 ℃, and the instantaneous flow of a high-pressure section is 4650m3/h -4700m3H, high pressure section pressure of 0.93-0.96 Mpa, high pressure section roller speed of 1.8-2.2m/min, and low pressure section instantaneous flow rate of 4500m3/h -4520m3The pressure of the low-pressure section is 0.50-0.52 Mpa, and the steel plate of the low-pressure section swings for 20-30 min.
In the second quenching and heating process, the temperature of the steel plate is rapidly raised to 815-825 ℃ at the average temperature rise speed of 6-7 ℃/min, then raised to 830-845 ℃ at 1-1.5 ℃/min, and the temperature is kept for 180-210 min. The quenching cooling process for the second time has the quenching starting temperature of 820-838 deg.c, fast water cooling in a rolling quenching machine at 25-27 deg.c and instantaneous high pressure stage flow rate of 4650m3/h -4700m3H, high pressure section pressure of 0.93-0.96 Mpa, high pressure section roller speed of 1.8-2.2m/min, and low pressure section instantaneous flow rate of 4500m3/h -4520m3The pressure of the low-pressure section is 0.50-0.52 Mpa, and the steel plate of the low-pressure section swings for 20-30 min.
In the tempering process, the steel plate is rapidly heated to 350-400 ℃ at an average heating rate of 5-6 ℃/min, then heated to 650-670 ℃ at 0.9-1.2 ℃/min, and is kept warm for 385-415 min.
The steel plate comprises the following components in percentage by mass: 0.12-0.14%, Mn: 1.3% -1.4%, Ni: 0.65% -0.70%, Cr: 0.32% -0.36%, Mo: 0.26-0.30%, Nb: 0.015 to 0.020 percent, and the balance of Fe and inevitable impurity elements.
The steel plate blank is a continuous casting billet, the section of the continuous casting billet is 330mm multiplied by 2500mm, and the specification of the production steel plate is (100 plus 110) mm multiplied by (2300 plus 2800) mm multiplied by (8000 plus 12000) mm.
Examples 1 to 6
A specific embodiment of the heat treatment method of the present invention will be described with reference to a steel sheet having a gauge size of 110mm × 2400mm × 10000mm as an example.
The chemical components and the mass percentage of the steel plate are shown in the table 1.
In the steel plate quenching process, a roller hearth type quenching furnace is adopted for heating, a roller press type quenching machine is adopted for rapid water cooling, the first quenching temperature rise speed, the heat preservation temperature and the heat preservation time, the high-pressure section water flow and pressure, the low-pressure section water flow and pressure, the water temperature and the steel plate roller speed are shown in tables 2 and 3.
The temperature rise speed, the heat preservation temperature and the heat preservation time of the second quenching, the water flow and the pressure of the high-pressure section, the water flow and the pressure of the low-pressure section, the water temperature and the steel plate roller speed of the second quenching are shown in tables 4 and 5.
The tempering heating-up speed, the heat preservation temperature and the heat preservation time of the steel plate are shown in a table 6.
The properties of the steel sheets prepared in the respective examples are shown in Table 7; the metallographic structure of the steel plate is shown in the figures 1-6.
TABLE 1 chemical compositions and mass percentages of steel plates of examples
TABLE 2 first quench heating Process parameters for the examples
TABLE 3 first quench Cooling Process parameters for the examples
TABLE 4 second quench heating Process parameters for the examples
TABLE 5 second quench Cooling Process parameters for the examples
TABLE 6 tempering Process parameters for the examples
TABLE 7 Properties of the steel sheets of examples
As can be seen from FIGS. 1 to 12, the metallographic structure of the steel plate prepared by the heat treatment method provided by the invention is tempered bainite with refined grains and uniform structure. As can be seen from Table 7, the steel plate has high strength and toughness matching, excellent performance and moderate strength, the yield strength is more than or equal to 420MPa, the tensile strength is 570-625 MPa, the elongation after fracture is more than or equal to 21 percent, and the average value of the impact energy at the position of 1/2 with the plate thickness of minus 20 ℃ is more than or equal to 60J.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (8)
1. A heat treatment method of a Mn-Ni-Cr-Mo-Nb steel plate is characterized by comprising the steps of sequentially carrying out primary quenching, secondary quenching and tempering treatment on the steel plate, wherein the quenching temperature of the primary quenching is 895-920 ℃, and the cooling mode is water cooling; the second quenching is carried out, wherein the quenching temperature is 830-845 ℃, and the cooling mode is water cooling; the tempering temperature is 650-670 ℃, and the cooling mode is discharging and air cooling.
2. The method for heat treatment of an Mn-Ni-Cr-Mo-Nb steel plate according to claim 1, wherein in the first quenching heating process, the steel plate is rapidly heated to 825 ℃ to 835 ℃ at an average heating rate of 6 ℃/min to 7 ℃/min, then heated to 895 ℃ to 920 ℃ at 1.5 ℃/min to 2.5 ℃/min, and is kept at the temperature for 180min to 210 min.
3. A heat treatment method of an Mn-Ni-Cr-Mo-Nb steel sheet as claimed in claim 1 or 2, wherein the first quenching cooling process is carried out at a first quenching start temperature of 885 ℃ to 910 ℃ by rapid water cooling using a roll press type quenching machine at a water temperature of 25 ℃ to 27 ℃ and an instantaneous high-pressure stage flow rate of 4650m3/h-4700m3H, high pressure section pressure of 0.93-0.96 Mpa, high pressure section roller speed of 1.8-2.2m/min, and low pressure section instantaneous flow rate of 4500m3/h-4520m3The pressure of the low-pressure section is 0.50-0.52 Mpa, and the steel plate of the low-pressure section swings for 20-30 min.
4. The method for heat treatment of an Mn-Ni-Cr-Mo-Nb steel plate according to claim 1, wherein in the second quenching heating process, the steel plate is rapidly heated to 815 ℃ -825 ℃ at an average heating rate of 6 ℃/min-7 ℃/min, then heated to 830 ℃ -845 ℃ at 1 ℃/min-1.5 ℃/min, and is kept for 180min-210 min.
5. The method for heat-treating a Mn-Ni-Cr-Mo-Nb steel sheet as claimed in claim 1 or 4, wherein the second quenching cooling process is performed at a second quenching start temperature of 820 ℃ to 838 ℃ by using a rapid hardening method using a roll press type hardening machineWater cooling, water temperature 25-27 deg.c, instantaneous high pressure stage flow rate 4650m3/h-4700m3H, high pressure section pressure of 0.93-0.96 Mpa, high pressure section roller speed of 1.8-2.2m/min, and low pressure section instantaneous flow rate of 4500m3/h-4520m3The pressure of the low-pressure section is 0.50-0.52 Mpa, and the steel plate of the low-pressure section swings for 20-30 min.
6. The method for heat treatment of an Mn-Ni-Cr-Mo-Nb steel plate according to claim 1, characterized in that in the tempering and heating process, the steel plate is rapidly heated to 350-400 ℃ at an average heating rate of 5-6 ℃/min, then heated to 650-670 ℃ at 0.9-1.2 ℃/min, and is kept for 385-415 min.
7. The heat treatment method of the Mn-Ni-Cr-Mo-Nb steel plate according to claim 1, characterized in that the steel plate contains C, Mn, Ni, Cr, Mo and Nb in percentage by mass: 0.12-0.14%, Mn: 1.3% -1.4%, Ni: 0.65% -0.70%, Cr: 0.32% -0.36%, Mo: 0.26-0.30%, Nb: 0.015 to 0.020 percent, and the balance of Fe and inevitable impurity elements.
8. A method for heat-treating a Mn-Ni-Cr-Mo-Nb steel sheet as claimed in any one of claims 1 to 6, wherein the steel sheet blank is a continuous slab having a cross-section of 330mm x 2500mm, and the specification of the produced steel sheet is (100-.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116445701A (en) * | 2023-03-17 | 2023-07-18 | 舞阳钢铁有限责任公司 | Steel plate heat treatment method for ultra-wide and ultra-thick medium-high temperature pressure container |
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| JPH02133521A (en) * | 1988-11-14 | 1990-05-22 | Sumitomo Metal Ind Ltd | Production of tempered high tensile steel plate having excellent toughness |
| CN101323929A (en) * | 2007-06-14 | 2008-12-17 | 舞阳钢铁有限责任公司 | High strength steel plate for big thickness tall building structure and production method thereof |
| CN109182690A (en) * | 2018-09-20 | 2019-01-11 | 舞阳钢铁有限责任公司 | A kind of heat treatment method of 550MPa grades of steel plate whole plate face performance uniformity |
| CN110952034A (en) * | 2019-11-28 | 2020-04-03 | 舞阳钢铁有限责任公司 | Large-thickness hydroelectric S550Q steel plate and production method thereof |
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2021
- 2021-12-21 CN CN202111573251.5A patent/CN114277222A/en active Pending
Patent Citations (4)
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|---|---|---|---|---|
| JPH02133521A (en) * | 1988-11-14 | 1990-05-22 | Sumitomo Metal Ind Ltd | Production of tempered high tensile steel plate having excellent toughness |
| CN101323929A (en) * | 2007-06-14 | 2008-12-17 | 舞阳钢铁有限责任公司 | High strength steel plate for big thickness tall building structure and production method thereof |
| CN109182690A (en) * | 2018-09-20 | 2019-01-11 | 舞阳钢铁有限责任公司 | A kind of heat treatment method of 550MPa grades of steel plate whole plate face performance uniformity |
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| Title |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116445701A (en) * | 2023-03-17 | 2023-07-18 | 舞阳钢铁有限责任公司 | Steel plate heat treatment method for ultra-wide and ultra-thick medium-high temperature pressure container |
| CN116445701B (en) * | 2023-03-17 | 2024-03-12 | 舞阳钢铁有限责任公司 | Steel plate heat treatment method for ultra-wide and ultra-thick medium-high temperature pressure container |
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