CN114196813B - Heat treatment process for pre-hardening of 3Cr13 die steel medium plate - Google Patents
Heat treatment process for pre-hardening of 3Cr13 die steel medium plate Download PDFInfo
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- CN114196813B CN114196813B CN202111475493.0A CN202111475493A CN114196813B CN 114196813 B CN114196813 B CN 114196813B CN 202111475493 A CN202111475493 A CN 202111475493A CN 114196813 B CN114196813 B CN 114196813B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 64
- 239000010959 steel Substances 0.000 title claims abstract description 64
- 238000010438 heat treatment Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000008569 process Effects 0.000 title claims abstract description 17
- 238000005096 rolling process Methods 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims description 21
- 238000005496 tempering Methods 0.000 claims description 17
- 238000010791 quenching Methods 0.000 claims description 9
- 230000000171 quenching effect Effects 0.000 claims description 9
- 238000004513 sizing Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 230000007480 spreading Effects 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000000137 annealing Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- 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
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to a heat treatment process for pre-hardening a 3Cr13 die steel medium plate, belongs to the technical field of heat treatment, and solves the technical problems of easy occurrence of rolling edge crack, stress crack, sawing processing difficulty, plate shape buckling and the like in the rolling production process of the 3Cr13 die steel medium plate.
Description
Technical Field
The invention belongs to the technical field of heat treatment, and particularly relates to a heat treatment process for pre-hardening a medium plate of 3Cr13 die steel.
Background
The 3Cr13 die steel medium plate is mainly used for corrosion-resistant high-end die frames and hot runners, and the die has corrosion resistance, certain hardness, wear resistance and polishing performance. The die steel is not rolled in China at present, only the forging material is used by customers after the pre-hardening treatment, the problem of heat treatment deformation after the processing is avoided, and the manufacturing precision of the die is ensured.
In the production process of the 3Cr13 die steel medium plate, the problems of rolling edge crack, stress crack, difficult sawing processing, plate shape buckling and the like are easy to occur. Comprehensively considering factors such as steel grade characteristics, equipment precision, product quality and the like, a production technology for pre-hardening a 3Cr13 die steel medium plate is needed to be provided.
Disclosure of Invention
In order to overcome the defects in the prior art and solve the technical problems of easy rolling edge crack, stress crack, difficult sawing processing, plate shape buckling and the like in the rolling production process of the 3Cr13 die steel medium plate, the invention provides a heat treatment process for pre-hardening the 3Cr13 die steel medium plate, realizes pre-hardening state delivery of the 3Cr13 die steel medium plate, meets the requirements of customers and fills the domestic blank.
The overall production process flow of the 3Cr13 die steel medium plate comprises the following steps: converter smelting +VD +LF- & gt continuous casting- & gt cutting of middle plate blanks- & gt annealing- & gt grinding of middle plate blanks- & gt heating- & gt descaling with high-pressure water- & gt rolling- & gt air cooling- & gt heat treatment- & gt checking of a cross warehouse.
The invention is realized by the following technical scheme.
A heat treatment process for pre-hardening a 3Cr13 die steel medium plate comprises the following steps:
s1, conveying a 3Cr13 die steel casting blank into a heating furnace for preheating, wherein the temperature of a preheating section is less than or equal to 900 ℃;
s2, the temperature of the heating section and the soaking section is 1230-1250 ℃, and the total residence time is 8-10min/10mm;
s3, rolling the blank heated in the step S2, wherein the initial rolling temperature is more than or equal to 1130 ℃, the pass reduction rate is more than or equal to 15%, and the final rolling temperature is more than or equal to 850 ℃, so as to obtain a 3Cr13 die steel medium plate intermediate blank;
s4, air cooling quenching and stress relief tempering:
spreading the intermediate blank of the 3Cr13 die steel medium plate on a cooling bed for air cooling quenching, hanging the intermediate blank to a low-temperature furnace for tempering when the intermediate blank is air cooled to 150-180 ℃, heating the intermediate blank to 450 ℃, preserving heat for 12 hours, and discharging the intermediate blank from the furnace for cooling;
s5, tempering twice:
the 3Cr13 die steel medium plates after stress relief annealing are stacked one by one, the heights of the sizing blocks are 100-150mm, the transverse spacing of the sizing blocks is 1200-1500mm, the longitudinal spacing of the sizing blocks is 800-1000mm, the 3Cr13 die steel medium plates are guaranteed to be heated uniformly, then tempering is carried out twice in sequence, and the tempering process for twice comprises the following steps:
the first stage: heating the 3Cr13 die steel medium plate to 300 ℃ and preserving heat for 1h;
and a second stage: heating to 450 ℃, wherein the heating speed is 25 ℃/h, and preserving heat for 3h at the constant temperature of 450 ℃;
and a third stage: heating to 520 ℃, wherein the heating speed is 25 ℃/h, and preserving heat for 3h at the constant temperature of 520 ℃;
fourth stage: heating to 610 ℃, wherein the heating speed is 25 ℃/h, and preserving heat for 3h at the constant temperature of 610 ℃;
fifth stage: cooling the 3Cr13 die steel medium plate to 580 ℃ along with a furnace, and then preserving heat at the constant temperature of 580 ℃ for 10 hours;
sixth stage: and discharging the 3Cr13 die steel medium plate, air cooling to room temperature, and finishing the pre-hardening heat treatment of the 3Cr13 die steel medium plate.
Further, the 3Cr13 die steel comprises the following components in percentage by mass: c:0.28% -0.32%, si:0.30% -0.80%, mn:0.40% -1.00%, P: less than or equal to 0.025 percent, S: less than or equal to 0.010%, cr:12.80% -13.80% and the balance of Fe and unavoidable impurities.
Further, the heating furnaces in the steps S1-S3 adopt three-section heating furnaces.
Further, the high-pressure water descaling is respectively carried out twice before the preheating in the step S1 and before the beginning rolling in the step S2, and the oxide skin on the surface of the blank is removed.
Compared with the prior art, the invention has the beneficial effects that:
the heat treatment process for pre-hardening the 3Cr13 die steel medium plate adopts air cooling quenching to replace water quenching, ensures that the steel plate shape is flat, is padded block by block and tempered twice during pre-hardening treatment, has uniform steel plate hardness, can easily finish sawing processing, and realizes the pre-hardening production of the 3Cr13 die steel medium plate.
Drawings
FIG. 1 is a graph of a two-pass tempering heat treatment process.
Detailed Description
The following examples are illustrative of the invention and are not intended to limit the scope of the invention. Unless otherwise indicated, the examples were all under conventional experimental conditions. In addition, various modifications or improvements in the materials ingredients and amounts used in these embodiments will be apparent to those skilled in the art without departing from the spirit and scope of the invention, and are intended to be within the scope of the invention as claimed.
The following 3Cr13 die steel comprises the following components in percentage by mass: c:0.30%, si:0.43%, mn:0.68%, P:0.020%, S:0.001%, cr:13.03%, the balance being Fe and unavoidable impurities.
A heat treatment process for pre-hardening a 3Cr13 die steel medium plate comprises the following steps:
s1, conveying a 3Cr13 die steel ingot into a heating furnace for preheating, wherein the preheating section temperature is 850-880 ℃;
s2, the temperature of the heating section and the soaking section is 1230-1250 ℃, and the total residence time is 170-190 mm;
s3, rolling the blank heated in the step S2, wherein the initial rolling temperature is 1130-1150 ℃, the pass reduction rate is more than or equal to 15%, and the core density of the steel plate is improved; the final rolling temperature is 860-880 ℃, so that the rolled plate shape is ensured, and the edge of the steel plate is prevented from cracking when the rolling temperature is low; preparing a 3Cr13 die steel medium plate intermediate blank; the heating furnace in the steps S1-S3 adopts a three-stage heating furnace, and high-pressure water descaling is respectively carried out twice before the preheating in the step S1 and before the initial rolling in the step S2, wherein the high-pressure water descaling pressure is 19.5-20.5MPa, and the oxide skin on the surface of the blank is removed;
s4, air cooling quenching and stress relief tempering:
spreading the intermediate blank of the 3Cr13 die steel medium plate on a cooling bed for air cooling quenching, wherein the start transition point Ms of the 3Cr13 martensite is about 220 ℃, and cooling the intermediate blank of the 3Cr13 die steel medium plate in air to obtain enough section quenching; when air-cooling to 150-180 ℃, hanging to a low-temperature furnace for tempering, and keeping the temperature for 12 hours after heating to 450 ℃ for discharging and stacking cooling, so as to eliminate the internal stress of the steel plate and prevent the cracking of the steel plate;
s5, tempering twice:
the 3Cr13 die steel medium plates after stress relief annealing are stacked one by one, the heights of the sizing blocks are 100-150mm, the transverse spacing of the sizing blocks is 1200-1500mm, the longitudinal spacing of the sizing blocks is 800-1000mm, the uniform heating of the 3Cr13 die steel medium plates is ensured, then tempering is sequentially carried out twice (the heat treatment process curve is shown in figure 1), and the twice tempering process comprises the following steps:
the first stage: heating the 3Cr13 die steel medium plate to 300 ℃ and preserving heat for 1h;
and a second stage: heating to 450 ℃, wherein the heating speed is 25 ℃/h, and preserving heat for 3h at the constant temperature of 450 ℃;
and a third stage: heating to 520 ℃, wherein the heating speed is 25 ℃/h, and preserving heat for 3h at the constant temperature of 520 ℃;
fourth stage: heating to 610 ℃, wherein the heating speed is 25 ℃/h, and preserving heat for 3h at the constant temperature of 610 ℃;
fifth stage: cooling the 3Cr13 die steel medium plate to 580 ℃ along with a furnace, and then preserving heat at the constant temperature of 580 ℃ for 10 hours;
sixth stage: and discharging the Cr13 die steel medium plate, air cooling to room temperature, and finishing the pre-hardening heat treatment of the 3Cr13 die steel medium plate.
Tests prove that when the steel plate is tempered once in the low-temperature furnace, a certain amount of residual austenite still exists in the structure, the hardness uniformity of the steel plate is poor and the subsequent sawing processing is influenced, so that the steel plate is required to be tempered twice in the low-temperature furnace, the hardness of the steel plate is 28-30HRC after the steel plate is tempered twice in the low-temperature furnace, and the unevenness is less than or equal to 5mm/m.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. The heat treatment process for pre-hardening the 3Cr13 die steel medium plate is characterized by comprising the following steps of:
s1, conveying a 3Cr13 die steel casting blank into a heating furnace for preheating, wherein the temperature of a preheating section is less than or equal to 900 ℃;
s2, the temperature of the heating section and the soaking section is 1230-1250 ℃, and the total residence time is 8-10min/10mm;
s3, rolling the blank heated in the step S2, wherein the initial rolling temperature is not less than 1130 ℃, and the pass reduction rate is not less than 15%, so as to obtain a 3Cr13 die steel medium plate intermediate blank;
s4, air cooling quenching and stress relief tempering:
spreading the intermediate blank of the 3Cr13 die steel medium plate on a cooling bed for air cooling quenching, hanging the intermediate blank to a low-temperature furnace for tempering when the intermediate blank is air cooled to 150-180 ℃, heating the intermediate blank to 450 ℃, preserving heat for 12 hours, and discharging the intermediate blank from the furnace for cooling;
s5, tempering twice:
the 3Cr13 die steel medium plates after stress relief tempering are stacked one by one, the heights of the sizing blocks are 100-150mm, the transverse spacing of the sizing blocks is 1200-1500mm, the longitudinal spacing of the sizing blocks is 800-1000mm, the 3Cr13 die steel medium plates are guaranteed to be heated uniformly, then tempering is carried out twice in sequence, and the tempering process for the twice comprises the following steps:
the first stage: heating the 3Cr13 die steel medium plate to 300 ℃ and preserving heat for 1h;
and a second stage: heating to 450 ℃, wherein the heating speed is 25 ℃/h, and preserving heat for 3h at the constant temperature of 450 ℃;
and a third stage: heating to 520 ℃, wherein the heating speed is 25 ℃/h, and preserving heat for 3h at the constant temperature of 520 ℃;
fourth stage: heating to 610 ℃, wherein the heating speed is 25 ℃/h, and preserving heat for 3h at the constant temperature of 610 ℃;
fifth stage: cooling the 3Cr13 die steel medium plate to 580 ℃ along with a furnace, and then preserving heat at the constant temperature of 580 ℃ for 10 hours;
sixth stage: and discharging the 3Cr13 die steel medium plate, air cooling to room temperature, and finishing the pre-hardening heat treatment of the 3Cr13 die steel medium plate.
2. The heat treatment process for pre-hardening a 3Cr13 mold steel medium plate according to claim 1, wherein: the 3Cr13 die steel comprises the following components in percentage by mass: c:0.28% -0.32%, si:0.30% -0.80%, mn:0.40% -1.00%, P: less than or equal to 0.025 percent, S: less than or equal to 0.010%, cr:12.80% -13.80% and the balance of Fe and unavoidable impurities.
3. The heat treatment process for pre-hardening a 3Cr13 mold steel medium plate according to claim 1, wherein: and the heating furnaces in the steps S1-S3 adopt three-stage heating furnaces.
4. The heat treatment process for pre-hardening a 3Cr13 mold steel medium plate according to claim 1, wherein: and (3) respectively carrying out high-pressure water descaling twice before preheating in the step S1 and before starting rolling in the step S2, and removing oxide scales on the surface of the blank.
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| CN202111475493.0A CN114196813B (en) | 2021-12-06 | 2021-12-06 | Heat treatment process for pre-hardening of 3Cr13 die steel medium plate |
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| CN202111475493.0A CN114196813B (en) | 2021-12-06 | 2021-12-06 | Heat treatment process for pre-hardening of 3Cr13 die steel medium plate |
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| CN114196813B true CN114196813B (en) | 2023-09-26 |
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| CN103276173A (en) * | 2013-06-08 | 2013-09-04 | 山西太钢不锈钢股份有限公司 | Process method for rolling plate from 4Cr13 medium plate corrosion resistance mold steel |
| JP2019081931A (en) * | 2017-10-31 | 2019-05-30 | 新日鐵住金株式会社 | Nickel-containing steel plate for low temperature excellent in toughness and method for manufacturing the same |
| CN110484701A (en) * | 2019-09-02 | 2019-11-22 | 钢铁研究总院 | A kind of heat treatment process of the low deformation rate of large die-casting mould steel high tenacity |
| CN111893367A (en) * | 2020-06-18 | 2020-11-06 | 江阴兴澄特种钢铁有限公司 | Method for producing 5CrNi2MoV hot-work die steel plate by using continuous casting slab |
| WO2021169621A1 (en) * | 2020-02-27 | 2021-09-02 | 江阴兴澄特种钢铁有限公司 | Pre-hardened mirror mold steel plate and manufacturing method therefor |
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- 2021-12-06 CN CN202111475493.0A patent/CN114196813B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276173A (en) * | 2013-06-08 | 2013-09-04 | 山西太钢不锈钢股份有限公司 | Process method for rolling plate from 4Cr13 medium plate corrosion resistance mold steel |
| JP2019081931A (en) * | 2017-10-31 | 2019-05-30 | 新日鐵住金株式会社 | Nickel-containing steel plate for low temperature excellent in toughness and method for manufacturing the same |
| CN110484701A (en) * | 2019-09-02 | 2019-11-22 | 钢铁研究总院 | A kind of heat treatment process of the low deformation rate of large die-casting mould steel high tenacity |
| WO2021169621A1 (en) * | 2020-02-27 | 2021-09-02 | 江阴兴澄特种钢铁有限公司 | Pre-hardened mirror mold steel plate and manufacturing method therefor |
| CN111893367A (en) * | 2020-06-18 | 2020-11-06 | 江阴兴澄特种钢铁有限公司 | Method for producing 5CrNi2MoV hot-work die steel plate by using continuous casting slab |
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