CN109306395B - Quenching and tempering pre-hardening treatment method for martensitic stainless steel large-sized steel plate - Google Patents
Quenching and tempering pre-hardening treatment method for martensitic stainless steel large-sized steel plate Download PDFInfo
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- CN109306395B CN109306395B CN201710630516.8A CN201710630516A CN109306395B CN 109306395 B CN109306395 B CN 109306395B CN 201710630516 A CN201710630516 A CN 201710630516A CN 109306395 B CN109306395 B CN 109306395B
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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
- 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
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
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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
- 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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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
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- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention discloses a quenching and tempering pre-hardening treatment method of a martensitic stainless steel large-sized steel plate, which comprises the following steps of: (1) annealing the rolled steel plate; (2) water quenching; (3) and (4) tempering and tempering. The martensite stainless steel large-scale steel plate is processed by adopting the quenching and tempering pre-hardening processing method of the martensite stainless steel large-scale steel plate, so that the steel plate is not easy to crack, and the obtained steel plate has good metallographic structure and hardness. Compared with the prior art, the quenching and tempering pre-hardening treatment method has the advantages that water quenching is adopted to replace oil quenching, so that the production cost is greatly saved, and in addition, the environment pollution is less because oil quenching is not adopted.
Description
Technical Field
The invention relates to a pretreatment method, in particular to a pretreatment method for hard materials.
Background
At present, the BM4Cr13(4Cr13) corrosion-resistant plastic die steel is pre-hardened and delivered, but as BM4Cr13(4Cr13) belongs to high Cr high alloy steel and BM4Cr13(4Cr13) is martensitic stainless steel, the larger the size of the martensitic stainless steel is, cracking and breaking are easy to occur in water quenching. The hardness requirement of the steel grade is between 30 and 36HRC, and the size of the steel plate is required as follows: the thickness is 60-200mm, the width is 1150-1350mm, and the length is 2000-10000 mm.
Therefore, the quenching and tempering method of oil quenching and tempering processes is commonly adopted for large martensitic stainless steel plates (such as BM4Cr13), because the oil quenching process can prevent cracking, so that the steel plates achieve the required hardness and other properties.
However, the oil quenching process in the prior art has high requirements on equipment and serious environmental pollution, so that a quenching and tempering pre-hardening treatment method is expected to be obtained, wherein the quenching and tempering pre-hardening treatment method can be used for carrying out water quenching pre-hardening treatment on a martensitic stainless steel large-sized steel plate (such as BM4Cr13), and the metallographic structure and hardness value of the steel plate obtained after the treatment meet the production requirements.
Disclosure of Invention
One of the purposes of the invention is to provide a quenching and tempering pre-hardening treatment method for a martensitic stainless steel large-sized steel plate, the quenching and tempering pre-hardening treatment method is adopted to treat the martensitic stainless steel large-sized steel plate, the steel plate is not easy to crack, and the obtained steel plate has good metallographic structure and hardness.
In order to achieve the purpose, the invention provides a quenching and tempering pre-hardening treatment method of a martensitic stainless steel large-sized steel plate, which comprises the following steps:
(1) annealing the rolled steel plate;
(2) water quenching;
(3) and (4) tempering and tempering.
In the quenching and tempering pre-hardening treatment method, water quenching is adopted for the martensitic stainless steel large-scale steel plate to replace oil quenching, and tempering and quenching treatment is carried out on the premise of ensuring that the steel plate does not crack, so that the internal stress of the steel plate is eliminated, and the metallographic structure and hardness value of the obtained martensitic stainless steel large-scale steel plate completely meet the use requirements of users.
According to the technical scheme, water quenching is adopted to replace oil quenching, so that compared with the prior art, the production cost is greatly saved, and in addition, the environmental pollution is less because oil quenching is not adopted.
Further, in the method for thermal refining and pre-hardening treatment of the invention, in the step (1), the annealing temperature is 800-.
Further, in the method for pre-hardening and tempering treatment according to the present invention, in the step (1), the temperature is raised to the annealing temperature of 800-850 ℃ at a rate of 70-90 ℃/hr.
Further, in the method for hardening and tempering pre-hardening according to the present invention, in the step (2), the water quenching includes the steps of:
(2a) heating the annealed steel plate to 920-960 ℃, and preserving heat for 20-60 min;
(2b) continuously cooling the upper surface and the lower surface of the steel plate by spraying water at a cooling speed of 4-13 ℃/s until the surface temperature of the steel plate is cooled to 50-180 ℃;
(2c) air cooling the steel plate for 1-3h in a cooling bed;
(2d) and performing stack cooling or slow cooling in a heat preservation box.
In the scheme, the step (2c) is to control the upper surface and the lower surface of the steel plate to be uniformly cooled, prevent the steel plate from cracking due to nonuniform cooling, control the surface temperature of the steel plate to be cooled to 50-180 ℃, and further reduce the occurrence of steel plate cracking.
In addition, the reason why the steel plate is air-cooled for 1 to 3 hours by the cooling bed is to make the temperature of the surface of the steel plate and the core of the steel plate uniform and avoid cracking.
Further, in the method for thermal refining and pre-hardening according to the present invention, in the step (3), the tempering temperature is 500 to 600 ℃.
Further, in the method for thermal refining and pre-hardening according to the present invention, the step (3) is performed within 24 hours after the step (2) is completed.
Further, in the method for quenching and tempering and pre-hardening treatment of the invention, the martensitic stainless steel large steel plate comprises the following chemical elements in percentage by mass:
c: 0.36-0.45%, less than or equal to 0.6% of Si, less than or equal to 0.8% of Mn, Cr: 12-14 percent of Ni, less than or equal to 0.6 percent of Ni, and the balance of Fe and inevitable impurities.
Further, in the method for hardening and tempering pre-hardening according to the present invention, the steel sheet is subjected to the step (1) within 5 hours after rolling in order to relieve stress and prevent cracking of the steel sheet.
The martensite stainless steel large-scale steel plate is processed by adopting the quenching and tempering pre-hardening processing method of the martensite stainless steel large-scale steel plate, so that the steel plate is not easy to crack, and the obtained steel plate has good metallographic structure and hardness.
Compared with the prior art, the quenching and tempering pre-hardening treatment method has the advantages that water quenching is adopted to replace oil quenching, so that the production cost is greatly saved, and in addition, the environment pollution is less because oil quenching is not adopted.
Detailed Description
The method for hardening and tempering a large-sized martensitic stainless steel plate and the method for manufacturing the same according to the present invention will be further explained and explained with reference to specific examples, which, however, should not be construed as unduly limiting the technical aspects of the present invention.
Examples 1 to 6
Table 1 lists the mass percentages of the respective chemical elements of the martensitic stainless steel large-sized steel sheets of examples 1 to 6.
Table 1 (wt%, balance Fe and inevitable impurity elements other than P, S)
| Numbering | C | Si | Mn | S | P | Cr | Ni |
| Example 1 | 0.3922 | 0.418 | 0.58 | 0.0024 | 0.0148 | 12.813 | 0.063 |
| Example 2 | 0.4081 | 0.434 | 0.567 | 0.0007 | 0.0151 | 12.938 | 0.063 |
| Example 3 | 0.3952 | 0.444 | 0.549 | 0.0012 | 0.0155 | 12.734 | 0.061 |
| Example 4 | 0.4173 | 0.423 | 0.495 | 0.0008 | 0.0175 | 12.739 | 0.061 |
| Example 5 | 0.4068 | 0.457 | 0.556 | 0.0012 | 0.0105 | 12.828 | 0.059 |
| Example 6 | 0.3935 | 0.455 | 0.526 | 0.0014 | 0.0124 | 12.55 | 0.059 |
The large martensitic stainless steel plates of examples 1 to 6 were processed by the method of the present invention, which comprises the steps of:
(1) annealing the rolled steel plate: raising the temperature to the annealing temperature of 800-850 ℃ at the speed of 70-90 ℃/h, keeping the temperature for 12-16h, then cooling the temperature in the furnace to below 450 ℃, and then cooling the temperature to the normal temperature after the temperature is discharged from the annealing furnace;
(2) water quenching;
(3) tempering and tempering: the tempering temperature is 500-600 ℃.
It should be noted that the water quenching step in each embodiment includes the following steps:
(2a) heating the annealed steel plate to 920-960 ℃, and preserving heat for 20-60 min;
(2b) continuously cooling the upper surface and the lower surface of the steel plate by spraying water at a cooling speed of 4-13 ℃/s until the surface temperature of the steel plate is cooled to 50-180 ℃;
(2c) air cooling the steel plate for 1-3h in a cooling bed;
(2d) and performing stack cooling or slow cooling in a heat preservation box.
Further, each example performed the step (3) within 24 hours after completion of the step (2), and the steel sheet performed the step (1) within 5 hours after rolling
Table 2 shows the specific process parameters of the thermal refining pre-hardening treatment method for the martensitic stainless steel large-sized steel sheets of examples 1 to 6.
Table 2.
The dimensions of the martensitic stainless steel large-sized steel plates obtained in examples 1 to 6 were measured, and the obtained data are shown in Table 3.
Table 3.
As can be seen from Table 3, the thickness of the martensitic stainless steel large steel plate of each example is 65-160mm, the width is 1300mm, and the length is 7900-.
In addition, hardness tests were performed on the martensitic stainless steel large-sized steel sheets of examples 1 to 6, and the measured hardness values are listed in Table 4.
Table 4.
As can be seen from Table 4, the hardness values of the martensitic stainless steel large steel plates of the examples are 30-60HRC, and meet the hardness requirement required by production. Further, the martensitic stainless steel large-sized steel sheet of each example was uniform in thickness and had a small difference in hardness value at each point in the thickness direction.
It should be noted that the combination of the features in the present application is not limited to the combination described in the claims of the present application or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradicted by each other.
In addition, it should be noted that the above-mentioned embodiments are only specific embodiments of the present invention, and obviously, the present invention is not limited to the above-mentioned embodiments, and many similar variations exist. All modifications which would occur to one skilled in the art and which are, therefore, directly derived or suggested from the disclosure herein are deemed to be within the scope of the present invention.
Claims (5)
1. The quenching and tempering pre-hardening treatment method of the martensitic stainless steel large-sized steel plate is characterized in that the mass percentage of chemical elements of the martensitic stainless steel large-sized steel plate is as follows: c: 0.36-0.45%, less than or equal to 0.6% of Si, less than or equal to 0.8% of Mn, Cr: 12-14%, Ni less than or equal to 0.6%, and the balance of Fe and inevitable impurities; the hardening and tempering pre-hardening treatment method comprises the following steps:
(1) annealing the rolled steel plate;
(2) water quenching:
(2a) heating the annealed steel plate to 920-960 ℃, and preserving heat for 20-60 min;
(2b) continuously cooling the upper surface and the lower surface of the steel plate by spraying water at a cooling speed of 4-13 ℃/s until the surface temperature of the steel plate is cooled to 50-180 ℃;
(2c) air cooling the steel plate for 1-3h in a cooling bed;
(2d) performing stack cooling or slow cooling in a heat preservation box;
(3) tempering and tempering: the tempering temperature is 500-600 ℃.
2. The method of claim 1, wherein in the step (1), the annealing temperature is 800-.
3. The method of pre-hardening and tempering according to claim 2, wherein in the step (1), the temperature is raised to an annealing temperature of 800-850 ℃ at a rate of 70-90 ℃/hr.
4. The method of pre-hardening and tempering according to claim 1, wherein step (3) is performed within 24 hours after completion of step (2).
5. The method of pre-hardening and tempering according to claim 1, wherein the steel sheet is subjected to the step (1) within 5 hours after rolling.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11158551A (en) * | 1997-11-27 | 1999-06-15 | Sumitomo Metal Ind Ltd | Production of martensitic stainless steel pipe |
| CN102392107A (en) * | 2011-11-16 | 2012-03-28 | 东北特殊钢集团有限责任公司 | Quenching method for 20Cr13-40Cr13 martensite stainless steel |
| CN102851607A (en) * | 2011-06-29 | 2013-01-02 | 宝山钢铁股份有限公司 | 110 ksi-Grade oil sleeve having high resistance to CO2 corrosion and its preparation method |
| CN104060054A (en) * | 2014-06-18 | 2014-09-24 | 中信重工机械股份有限公司 | Thermal treatment method of martensitic stainless steel liner plate |
| CN105969945A (en) * | 2016-06-02 | 2016-09-28 | 溧阳市金昆锻压有限公司 | Quenching and high temperature tempering process of 20Cr13 middle piece for pump |
-
2017
- 2017-07-28 CN CN201710630516.8A patent/CN109306395B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11158551A (en) * | 1997-11-27 | 1999-06-15 | Sumitomo Metal Ind Ltd | Production of martensitic stainless steel pipe |
| CN102851607A (en) * | 2011-06-29 | 2013-01-02 | 宝山钢铁股份有限公司 | 110 ksi-Grade oil sleeve having high resistance to CO2 corrosion and its preparation method |
| CN102392107A (en) * | 2011-11-16 | 2012-03-28 | 东北特殊钢集团有限责任公司 | Quenching method for 20Cr13-40Cr13 martensite stainless steel |
| CN104060054A (en) * | 2014-06-18 | 2014-09-24 | 中信重工机械股份有限公司 | Thermal treatment method of martensitic stainless steel liner plate |
| CN105969945A (en) * | 2016-06-02 | 2016-09-28 | 溧阳市金昆锻压有限公司 | Quenching and high temperature tempering process of 20Cr13 middle piece for pump |
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