CN113061691A - AISI410SS martensitic stainless steel post-forging annealing process - Google Patents
AISI410SS martensitic stainless steel post-forging annealing process Download PDFInfo
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- CN113061691A CN113061691A CN202110288233.6A CN202110288233A CN113061691A CN 113061691 A CN113061691 A CN 113061691A CN 202110288233 A CN202110288233 A CN 202110288233A CN 113061691 A CN113061691 A CN 113061691A
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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
- C21D1/26—Methods of annealing
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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
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
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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
- C21D11/00—Process control or regulation for heat treatments
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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
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
- C21D3/06—Extraction of hydrogen
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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
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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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
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- Materials Engineering (AREA)
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- Forging (AREA)
Abstract
The invention discloses an AISI410SS martensitic stainless steel post-forging annealing process, which comprises the following steps: forging a product, after forging, placing the product in static air for cooling, cooling to 350-400 ℃ for heat preservation when cooling, loading the product into a heating furnace for heat preservation when preserving heat, heating to 600-700 ℃ along with the furnace after heat preservation, loading into the heating furnace for heat preservation, heating to 890-950 ℃ along with the furnace after heat preservation, loading into the heating furnace for heat preservation, then cooling along with the furnace, cooling to 700-750 ℃ along with the furnace for heat preservation, cooling along with the furnace again after heat preservation, and cooling to 400-450 ℃. And then discharging from the furnace for air cooling, cooling to the surface of the product of 320-360 ℃, then placing in the furnace for heat preservation for 3-5 h, then heating to 680 +/-10 ℃ along with the furnace, and preserving heat. The invention is complete annealing and hydrogen diffusion annealing, which not only can uniformly organize refined grains, improve the mechanical property of the material, but also can diffuse hydrogen in the material, reduce the internal structure stress of the material and reduce the cracking risk. In the forging cooling and the hydrogen diffusion cooling, special modes are adopted, so that the production period is greatly shortened while the product quality is ensured.
Description
Technical Field
The invention relates to the field of stainless steel, in particular to an AISI410SS martensitic stainless steel post-forging annealing process.
Background
The cooling of the forged steel ingot belongs to the preparation heat treatment, the reasonable cooling process can effectively reduce the internal stress of the product and reduce the cracking risk of the product, and meanwhile, the preparation is made for the performance heat treatment in the later period.
The martensitic stainless steel AISI410SS can obtain a martensite structure under the condition of air cooling after forging, thereby generating great internal structural stress and causing product cracking. In addition, the martensitic stainless steel AISI410SS belongs to a white spot sensitive material, and if good hydrogen diffusion treatment is not carried out after forging, white spots or hydrogen-induced delayed cracks are always easily generated in the later use process.
The low-temperature impact toughness of the martensitic stainless steel AISI410SS material is unstable, and the low-temperature impact toughness requirement is difficult to meet only through performance heat treatment. Thus, an AISI410SS martensitic stainless steel post forging annealing process is provided.
Disclosure of Invention
The invention aims to provide a forging annealing process for the AISI410SS martensitic stainless steel, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: an AISI410SS martensitic stainless steel post-forging annealing process comprises the following steps:
the method comprises the following steps: forging the product, after forging, placing the product in static air for cooling, cooling to 350-400 ℃ for heat preservation during cooling, and placing the product into a heating furnace for heat preservation during heat preservation;
step two: after the heat preservation is finished, heating the mixture to 600-700 ℃ along with the furnace, and putting the mixture into a heating furnace for heat preservation;
step three: after the heat preservation is finished, heating the mixture to 890-950 ℃ along with the furnace, putting the mixture into a heating furnace for heat preservation, and then cooling along with the furnace;
step four: cooling to 700-750 ℃ along with the furnace, preserving heat, cooling to 400-450 ℃ along with the furnace after heat preservation is finished, taking out of the furnace, air cooling, and cooling to 320-360 ℃ of the surface of a product;
step five: then keeping the temperature in the furnace for 3-5 h, heating to 680 +/-10 ℃ along with the furnace, and keeping the temperature;
step six: finally cooling to below 250 ℃ at a cooling speed of less than or equal to 25 ℃/h, discharging from the furnace, and air-cooling to room temperature.
Preferably, when the temperature is cooled to 350-400 ℃ for heat preservation, the heat preservation time is 3-5 h.
Preferably, the temperature is raised to 600-700 ℃ along with the furnace, and the heat preservation time is 3 hours when the furnace is put into a heating furnace for heat preservation.
Preferably, the temperature is raised to 890-950 ℃ along with the furnace, and when the material is put into a heating furnace for heat preservation, the heat preservation time is calculated according to the product maximum wall thickness multiplied by 0.7 h/in.
Preferably, when the temperature is kept along with furnace cooling to 700-750 ℃, the holding time is calculated by multiplying the maximum wall thickness of the product by 1.0 h/in.
Preferably, the temperature is raised to 680 +/-10 ℃ along with the furnace, and heat preservation is carried out, wherein the heat preservation time is calculated by multiplying the maximum wall thickness of the product by 1.5h/in during heat preservation.
The invention has the technical effects and advantages that: the process is complete annealing and hydrogen diffusion annealing, not only can uniformly organize refined grains and improve the mechanical property of the material, but also can diffuse hydrogen in the material, reduce the internal structure stress of the material and reduce the cracking risk. In the forging cooling and the hydrogen diffusion cooling, special modes are adopted, so that the production period is greatly shortened while the product quality is ensured.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides an AISI410SS martensitic stainless steel post-forging annealing process, which comprises the following steps:
forging a product, placing the product in static air for cooling after forging, cooling to 350-400 ℃ for heat preservation when cooling, placing the product into a heating furnace for heat preservation when heat preservation is performed, heating to 600-700 ℃ along with the furnace after heat preservation, placing the product into the heating furnace for heat preservation, heating to 890-950 ℃ along with the furnace after heat preservation, placing the product into the heating furnace for heat preservation, then cooling along with the furnace to 700-750 ℃ for heat preservation, cooling along with the furnace to 400-450 ℃ after heat preservation, discharging from the furnace for air cooling, cooling to 320-360 ℃ on the surface of the product, then performing heat preservation in the furnace for 3-5 h, then heating to 680 +/-10 ℃ along with the furnace, performing heat preservation, finally cooling to below 250 ℃ at a cooling speed of less than or equal to 25 ℃/h, discharging from the furnace for air cooling to room temperature, when the temperature is cooled to 350-400 ℃ for heat preservation, the heat preservation time is 3-5 h.
Heating to 600-700 ℃ along with the furnace, when the material is placed into a heating furnace for heat preservation, the heat preservation time is 3 hours, heating to 890-950 ℃ along with the furnace, when the material is placed into the heating furnace for heat preservation, the heat preservation time is calculated according to the product maximum wall thickness multiplied by 0.7h/in, when the material is cooled to 700-750 ℃ along with the furnace for heat preservation, the heat preservation time is calculated according to the product maximum wall thickness multiplied by 1.0h/in, then heating to 680 +/-10 ℃ along with the furnace, and heat preservation is carried out, and when the material is subjected to heat preservation, the heat preservation time is calculated according to the product maximum wall thickness multiplied by 1.5 h.
The working principle of the invention is as follows: after the product is forged, the product is cooled in static air, so that the temperature of the product can be uniformly changed in the cooling process; cooling to 350-400 ℃ and preserving heat to ensure that the product does not have martensite phase transformation, and simultaneously reducing the core temperature of the product to convert the core austenite structure into a steady-state structure; then heating to 600-700 ℃ along with the furnace, and preserving heat for 3h, so that the temperature difference between the surface and the core during heating can be reduced, the core tensile stress can be reduced, and simultaneously carbide can be precipitated to be refined austenite grains for preparation; then, the temperature is raised to 890-950 ℃ along with the furnace, the heat preservation is carried out, the heat preservation time is calculated according to 0.7h/in, the temperature is 20-50 ℃ above Ac3 according to the maximum wall thickness of the product, and the product can be fully austenitized and has fine grains; then cooling to 700-750 ℃ along with the furnace and preserving heat, wherein the heat preservation time is calculated according to 1.0h/in, and the heat preservation can be converted into more than 90% of ferrite according to the maximum wall thickness of the product, so that the tissue stress of the product is greatly reduced, meanwhile, the solubility of hydrogen in ferrite is far lower than that of austenite, and the diffusion coefficient is far higher than that of austenite; then cooling to 400-450 ℃ along with the furnace, further dehydrogenating in the cooling process along with the furnace, when the temperature is lower than 400-450 ℃, the effect of furnace cooling dehydrogenation is not obvious, in order to improve the efficiency, air cooling is adopted to 320-360 ℃ of the surface of the product, heat preservation is carried out for 3-5 h, the temperature difference between the surface and the core of the product can be uniform by heat preservation at the temperature, and meanwhile, the solid-dissolved hydrogen is supersaturated; then, the temperature is raised to 650-700 ℃ along with the furnace, the heat preservation is carried out, the heat preservation time is calculated according to 1.5h/in, and the supersaturated hydrogen can be rapidly diffused after the product is heated again and the heat preservation is carried out; and then cooling to below 250 ℃ at a cooling speed of less than or equal to 25 ℃/h, discharging from the furnace, air-cooling to room temperature, slowly cooling to further dehydrogenate, and simultaneously reducing thermal stress to prevent cracking of the product.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
The standard parts used by the invention can be purchased from the market, and the special-shaped parts can be customized according to the description of the specification.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. An AISI410SS martensitic stainless steel post-forging annealing process is characterized by comprising the following steps:
the method comprises the following steps: forging the product, after forging, placing the product in static air for cooling, cooling to 350-400 ℃ for heat preservation during cooling, and placing the product into a heating furnace for heat preservation during heat preservation;
step two: after the heat preservation is finished, heating the mixture to 600-700 ℃ along with the furnace, and putting the mixture into a heating furnace for heat preservation;
step three: after the heat preservation is finished, heating the mixture to 890-950 ℃ along with the furnace, putting the mixture into a heating furnace for heat preservation, and then cooling along with the furnace;
step four: cooling to 700-750 ℃ along with the furnace, preserving heat, cooling to 400-450 ℃ along with the furnace after heat preservation is finished, taking out of the furnace, air cooling, and cooling to 320-360 ℃ of the surface of a product;
step five: then keeping the temperature in the furnace for 3-5 h, heating to 680 +/-10 ℃ along with the furnace, and keeping the temperature;
step six: finally cooling to below 250 ℃ at a cooling speed of less than or equal to 25 ℃/h, discharging from the furnace, and air-cooling to room temperature.
2. The AISI410SS martensitic stainless steel annealing process after forging as claimed in claim 1 wherein the temperature holding time is 3h-5h when cooling to 350-400 ℃ for heat preservation.
3. The AISI410SS martensitic stainless steel annealing process after forging of claim 1, wherein the temperature is raised to 600 ℃ -700 ℃ along with the furnace, and the holding time is 3h when the stainless steel is put into a heating furnace for holding.
4. The AISI410SS martensitic stainless steel post-forging annealing process according to claim 1, wherein the temperature is raised to 890-950 ℃ along with the furnace, and the holding time when the stainless steel is put into a heating furnace for holding the temperature is calculated by multiplying 0.7h/in by the maximum wall thickness of the product.
5. The AISI410SS martensitic stainless steel post forging annealing process according to claim 1, wherein the holding time is calculated as 1.0h/in multiplied by the maximum wall thickness of the product when furnace cooling is carried out to 700 ℃ -750 ℃.
6. The AISI410SS martensitic stainless steel post-forging annealing process according to claim 1, wherein the temperature is then raised to 680 ± 10 ℃ along with the furnace, and the temperature is kept, wherein the temperature keeping time is calculated by multiplying the maximum wall thickness of the product by 1.5 h/in.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110288233.6A CN113061691A (en) | 2021-03-18 | 2021-03-18 | AISI410SS martensitic stainless steel post-forging annealing process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113957354A (en) * | 2021-10-29 | 2022-01-21 | 河南中原特钢装备制造有限公司 | Avoidance of PCrNi3Method for stable overheating of MoV forge piece due to genetic formation of crystal grains |
| CN117070732A (en) * | 2023-10-13 | 2023-11-17 | 江阴市恒业锻造有限公司 | Forging anti-cracking heat treatment process for polyester reactor |
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| CN109825688A (en) * | 2019-03-06 | 2019-05-31 | 江苏品模信息科技有限公司 | Heat processing technique for P20 and 718 plastic die steels |
| CN109852778A (en) * | 2019-02-22 | 2019-06-07 | 无锡宏达重工股份有限公司 | The heat treatment process of 10Cr9MoW2VNbBN crystal grain refinement |
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2021
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| CN103849745A (en) * | 2012-12-04 | 2014-06-11 | 上海重型机器厂有限公司 | Post-forging thermal treatment method for heavy forging of hot-wall hydrogenation reactor |
| CN103014259A (en) * | 2012-12-29 | 2013-04-03 | 大冶特殊钢股份有限公司 | After-forging hydrogen diffusion and annealing method of forging material |
| CN103320597A (en) * | 2013-06-14 | 2013-09-25 | 攀钢集团成都钢钒有限公司 | Method for refining coarse grain of 10Cr9Mo1VNbN steel pipe and forged piece |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113957354A (en) * | 2021-10-29 | 2022-01-21 | 河南中原特钢装备制造有限公司 | Avoidance of PCrNi3Method for stable overheating of MoV forge piece due to genetic formation of crystal grains |
| CN117070732A (en) * | 2023-10-13 | 2023-11-17 | 江阴市恒业锻造有限公司 | Forging anti-cracking heat treatment process for polyester reactor |
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