CN111607734A - Preparation method of 17-4PH stainless steel base - Google Patents
Preparation method of 17-4PH stainless steel base Download PDFInfo
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- 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
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- 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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/004—Dispersions; Precipitations
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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Abstract
The invention belongs to the field of base manufacturing and heat treatment, and particularly relates to a preparation method of a 17-4PH stainless steel base, which mainly comprises the following steps: the 17-PH base is manufactured by a treatment mode combining component design, smelting, casting, multiple forging and solid solution aging. The technical scheme of the invention can better control the ferrite content in the base, the repeated forging is beneficial to the formation of a high-density dislocation wall in the matrix, the refining effect of the alloy microstructure is obvious, the phenomena of surface layer cracking and hot brittleness in the forging process are avoided, and the strength of the 17-4PH base is improved. Meanwhile, a convenient and quick 17-4PH base preparation process is provided, the preparation efficiency is improved, the corrosion resistance under a complex environment is met while the strength and the toughness are ensured, the use performance of the 17-4PH base is comprehensively improved, the requirement of industrial production can be better met, and the large-scale production is realized.
Description
Technical Field
The invention relates to the field of base manufacturing and heat treatment, in particular to a preparation method of a 17-4PH stainless steel base.
Background
The information disclosed in this background of the invention is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art; in recent years, with the development of marine oil and gas resources in China, high-strength stainless steel materials are widely used in underwater production systems such as seabed oil and gas conveying systems, offshore platform systems, offshore transportation systems and the like. Due to the complexity and the particularity of the marine service environment, the marine environment still has the risks of complex and large stress of the material and pitting failure on the surface of the material, and serious safety accidents are caused at the moment. In particular, the development and application of high-strength seawater corrosion resistant metal materials become important research directions in the field of materials.
The 17-4PH steel belongs to precipitation hardening stainless steel. The strength level is equivalent to Cr13 type martensitic stainless steel, the corrosion resistance is equivalent to 18-8 type austenitic stainless steel, the cold and hot processing performance, the welding performance and the casting performance are good, and the 17-4PH stainless steel is widely applied to aircraft engines, missiles, chemical equipment, nuclear reaction thrust weights, offshore platforms, helicopters, decks, aerospace vortex machine blades, nuclear waste buckets and the like.
The base mechanism is applied to various aspects in life and production, such as wind power generation, ships, offshore platforms, signal base stations and the like. Due to their structural and performance specificity, support and stability needs to be provided for other structures. Therefore, the base is required to have sufficient strength, corrosion resistance and the like, and the base has good service performance, which is an important prerequisite for ensuring the normal operation of various works and the safety of personnel.
In recent years, with the development of 17-4PH stainless steel in China, solution aging treatment is gradually applied to the treatment of 17-4PH stainless steel, but the problems in the forging process of 17-4PH stainless steel are not many, and some treatment methods of 17-4PH stainless steel are disclosed in the prior art, for example, patent CN103643160A discloses a high-performance 17-4PH stainless steel and a preparation method thereof, and the high-performance 17-4PH stainless steel is obtained by mixing components, mixing, ball milling, granulating, pressing, degreasing and vacuum sintering, and can be used for manufacturing equipment or parts which bear heavy load and have high requirements on hardness, wear resistance and corrosion resistance.
The patent CN106567003A discloses an improved high-hardness 17-4PH stainless steel and a preparation method thereof, which can shorten the production period and reduce the energy consumption by controlling the carbon content of stainless steel powder, sintering at 1315-1345 ℃ in a protective atmosphere and cooling along with a furnace.
The patent CN107385144A discloses a precipitation hardening martensitic stainless steel 17-4PH smelting process, and low-carbon, low-gas, low-inclusion and low-five-harm 17-4PH stainless steel is obtained by controlling the smelting process and adopting VOC vacuum oxygen blowing.
Patent CN107385144A discloses a manufacturing process of 17-4PH stainless steel MIM parts, which combines 17-4PH stainless steel powder with adhesive, and forms compact MIM parts by injection molding, degreasing sintering, sintering and nitriding.
Patent CN111074048A discloses a manufacturing method of a 17-4PH material high-temperature and high-pressure resistant forging, wherein an impeller and an air disc which can be manufactured through smelting, forging, heat treatment and twice precipitation hardening treatment have the characteristics of high-temperature and high-pressure resistance.
Patent CN105170869 discloses a forging method for improving transverse mechanical properties of a 17-4PH forging, which improves the density of the forging and greatly improves the transverse mechanical properties of the forging by cutting before forging, controlling forging temperature and upsetting and drawing processes in different directions.
In summary, in the prior art, 17-4PH stainless steel treated by forging and solution aging still has the following three problems that (1) the surface layer cracking and hot brittleness phenomenon in the forging process are not controlled, and stress generated by impact, abrasion, fatigue and plastic deformation needs to be borne in the service process, and if the 17-4PH stainless steel base is not properly treated in the heat treatment and forging processes, a die fails in advance, so that economic loss or production accidents are caused. (2) After subsequent solid solution and aging treatment, although the strength of the stainless steel with the pH of 17-4 is improved, the precipitation hardening phase is continuously aggregated and grown due to overhigh aging temperature and overlong aging time, the strength begins to be reduced, and the plasticity is increased. (3) The manufacturing process of the offshore base is not complete enough, a complete set of 17-4PH base manufacturing process is not formed, the existing process is complicated, the energy consumption is high, the base platform has poor capability of coping with complex environments, the corrosion resistance is not obviously improved, and the processing efficiency and the service performance of the 17-4PH base are influenced.
Disclosure of Invention
Aiming at the problems that the prior art has limited improvement on the performance of a 17-4PH base, the surface layer is easy to crack and hot-brittle, the strength and the plasticity of a product are difficult to simultaneously improve, the weldability is poor, the corrosion resistance is poor, the process is complicated and the like, the invention aims to provide a preparation method of a 17-4PH stainless steel base, and the invention provides a convenient and rapid preparation flow for the 17-4PH base through a treatment mode of combining component design, smelting, casting, multiple forging and solid solution aging compared with the prior art, the technical scheme of the invention can improve the preparation efficiency, reduce the cracking phenomenon, meet the corrosion resistance under the complex environment while ensuring the strength and the toughness, comprehensively improve the mechanics and the service performance of the 17-4PH base, and better meet the requirements of industrial production, realizing large-scale production.
In order to achieve the above purpose, the present invention discloses the following technical solutions.
Firstly, the method designs the components of the 17-4PH material, then carries out smelting and casting according to the components, and completes the preparation process of the large-scale 17-4PH base by combining multiple times of forging and solid solution aging treatment. The method specifically comprises the following steps:
(1) designing components: the 17-4PH material comprises the following chemical components in percentage by weight: c: 0.07 percent; si is less than or equal to 1.0 percent; mn is less than or equal to 1.0 percent; p is less than or equal to 0.03 percent; s is less than or equal to 0.01 percent; ni: 4.0 to 4.5 percent; cr: 15 to 16 percent; cu: 3.0 to 5.0 percent; mo is less than or equal to 0.5 percent; nb: 0.15 to 0.45 percent; pb is less than or equal to 0.01 percent; sn is less than or equal to 0.01 percent; as is less than or equal to 0.01 percent; bi is less than or equal to 0.01 percent; sb is less than or equal to 0.01 percent; the balance being Fe.
(2) Smelting and casting: and (3) smelting the proportioned 17-4PH material in a smelting furnace, adopting a VD furnace and LF furnace smelting process, and casting into an ingot after smelting.
(3) Forging for multiple times: then the cast ingot is forged, and the process flow is as follows: blanking → secondary heating → upsetting → preforging → secondary forging → finish forging → furnace cooling.
(4) Solid solution aging treatment: finally, heating the forged 17-4PH base to an austenite temperature for solution treatment to obtain a supersaturated copper and niobium martensite structure, wherein the martensite has high toughness so as to obtain a certain degree of reinforcement; and after aging treatment, elements such as supersaturated copper, niobium and the like dissolved in the matrix structure are precipitated, so that the material is further strengthened, and finally, the structure is mainly martensite + part-ferrite + -Cu and Nb precipitated phases, so that the base is strengthened, and the mechanical property is improved.
As a further technical scheme, in the step (1), in order to control the ferrite content, the chemical components and the weight percentage of the 17-4PH material meet the requirement of being less than or equal to 5%, and further meet the requirement of mechanical properties, the component content needs to be further limited, wherein the chemical components and the weight percentage are as follows: 4.0 to 4.5 percent; cr: 15 to 16 percent; c, taking an upper limit; the lower limit of Mo is selected, and the ferrite content can be better controlled.
As a further technical scheme, in the step (2), the refining temperature of the 17-4PH material is 1670-.
As a further technical proposal, in the step (3), the forging temperature of the 17-4PH base is 1175-1205 ℃.
As a further technical scheme, in the step (3), the secondary heating is to preheat the 17-4PH ingot at 820-930 ℃ for 2-2.5h, then transfer the ingot into a high-temperature furnace to heat to the forging temperature and preserve heat for 1.5-2h, which is beneficial to refining the base structure crystal grains, is convenient for forging, and simultaneously prevents the workpiece from being over-fired due to overhigh heating temperature and prevents internal cracks caused by thermal shock.
As a further technical solution, in the step (3), the multiple forging process: the deformation of upsetting, pre-forging, secondary forging and final forging is 10-20%.
As a further technical solution, in the step (3), the furnace cooling: in order to prevent the forging from cracking, for a large forging, the cooling mode after heat treatment is generally furnace cooling, pit cooling or sand cooling, and rapid cooling is forbidden.
As a further technical scheme, in the step (4), the solid solution and aging treatment comprises the following steps: firstly heating to 1000-1150 ℃ for solid solution, keeping the temperature for 1-4h, cooling the oil to room temperature, carrying out solid solution treatment, aging at 610-630 ℃ for 1-4h, and cooling to room temperature by air.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention can better control the ferrite content in the base and improve the solid solution degree by controlling the components and the content of the stainless steel with the pH of 17-4, thereby obtaining the required structure and mechanical property more conveniently through the subsequent process.
(2) The invention adopts multiple forging and secondary heating treatment, and can ensure the forming of the forge piece by controlling the temperature and the deformation amount before and during continuous forging, avoid forging cracks and improve the grain size of the product. In the deformation process, the continuous change of the load direction is beneficial to the formation of a high-density dislocation wall in the matrix, the strength of the 17-4PH base is improved, after isothermal multiple forging, the refining effect of an alloy microstructure is obvious, and the ductility of the material is further improved.
(3) The invention breaks through the inherent processing thinking of the 17-4PH stainless steel of the existing forging, heat treatment process and the like, provides a set of complete 17-4PH base manufacturing method, can effectively prevent the cracking phenomenon in the forging process, simultaneously plays a role in refining crystal grains, and can greatly improve the corrosion resistance of the 17-4PH base under the condition of keeping good strength and toughness.
The specific implementation mode is as follows:
it is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms also are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be further understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic view of a 17-4PH base, in which: 1 is the base, 2 is the through-hole, 3 is the identification area, 4 is the fixed orifices.
The invention will now be further described with reference to the accompanying drawings and detailed description.
Example 1:
firstly, according to the chemical components and weight percentages of a 17-4PH material: c: 0.07 percent; si is less than or equal to 1.0 percent; mn is less than or equal to 1.0 percent; p is less than or equal to 0.03 percent; s is less than or equal to 0.01 percent; ni: 4.0 to 4.5 percent; cr: 15 to 16 percent; cu: 3.0 to 5.0 percent; mo is less than or equal to 0.5 percent; nb: 0.15 to 0.45 percent; pb is less than or equal to 0.01 percent; sn is less than or equal to 0.01 percent; as is less than or equal to 0.01 percent; bi is less than or equal to 0.01 percent; sb is less than or equal to 0.01 percent; the balance of Fe, and the 17-4PH material is well proportioned. And (3) smelting the 17-4PH in a smelting furnace, adopting a VD furnace and LF furnace smelting process, keeping the refining temperature at 1670 ℃ for 10min, taking the mixture out of the furnace at 1670 ℃, controlling the pouring temperature, adopting a slow cooling speed, and pouring the mixture into an ingot after smelting. Then, referring to fig. 1, the ingot is forged for a plurality of times, the forging temperature of the 17-4PH base is 1175 ℃, and the process flow is as follows: blanking → secondary heating (17-4 PH ingot preheated at 820 ℃ for 2h, then transferred into a high temperature furnace to be heated to forging temperature and insulated for 1.5.) → upsetting (deformation 10%) → pre-forging (deformation 10%) → secondary forging (deformation 10%) → final forging (deformation 10%) → furnace cooling. And finally, carrying out solid solution aging treatment on the forged 17-4PH base, heating the solid solution treatment to 1100 ℃ for solid solution, keeping the temperature for 1h, cooling the oil to room temperature, carrying out solid solution treatment to obtain a supersaturated copper and niobium martensite structure so as to obtain a certain degree of strengthening, then carrying out aging treatment, carrying out solid solution treatment, then carrying out aging at 610 ℃ for 1h, cooling the air to room temperature, precipitating supersaturated copper, niobium and other elements dissolved in the matrix structure, further strengthening the material, and finally carrying out a structure which is mainly martensite plus part-ferrite + -Cu and Nb precipitation phase so as to strengthen the base and improve the mechanical property.
Example 2:
firstly, according to the chemical components and weight percentage of a 17-4PH material: c: 0.07 percent; si is less than or equal to 1.0 percent; mn is less than or equal to 1.0 percent; p is less than or equal to 0.03 percent; s is less than or equal to 0.01 percent; ni: 4.0 to 4.5 percent; cr: 15 to 16 percent; cu: 3.0 to 5.0 percent; mo is less than or equal to 0.5 percent; nb: 0.15 to 0.45 percent; pb is less than or equal to 0.01 percent; sn is less than or equal to 0.01 percent; as is less than or equal to 0.01 percent; bi is less than or equal to 0.01 percent; sb is less than or equal to 0.01 percent; the balance of Fe, and the material is proportioned well. And (3) putting the proportioned 17-4PH into a smelting furnace for smelting, adopting a smelting process of a VD furnace and an LF furnace, keeping the temperature for 15min at the refining temperature of 1680 ℃, taking the mixture out of the furnace at the tapping temperature of 1680 ℃, simultaneously controlling the pouring temperature, adopting a slower cooling speed, and pouring the mixture into an ingot after smelting. Then, referring to fig. 1, the ingot is forged for multiple times, the forging temperature of the 17-4PH base is 1185 ℃, and the process flow is as follows: blanking → secondary heating (17-4 PH ingot preheated at 850 ℃ for 2.3h, then transferred into a high temperature furnace to be heated to forging temperature and insulated for 1.7 h.) → upsetting (deformation 15%) → pre-forging (deformation 15%) → secondary forging (deformation 15%) → finish forging (deformation 15%) → furnace cooling. And finally, carrying out solid solution aging treatment on the forged 17-4PH base, heating the solid solution treatment to 1120 ℃ for solid solution, keeping the temperature for 2h, cooling the oil to room temperature, carrying out solid solution treatment to obtain a supersaturated copper and niobium martensite structure so as to obtain certain strengthening, carrying out aging treatment, carrying out solid solution treatment, then carrying out aging treatment at 620 ℃ for 2h, cooling the air to room temperature, and precipitating elements such as supersaturated copper, niobium and the like dissolved in the matrix structure so as to further strengthen the material. The final structure is mainly martensite + part-ferrite + -Cu and Nb precipitation phase, so that the base is strengthened and the mechanical property is improved.
Example 3:
firstly, according to the chemical components and weight percentages of a 17-4PH material: c: 0.07 percent; si is less than or equal to 1.0 percent; mn is less than or equal to 1.0 percent; p is less than or equal to 0.03 percent; s is less than or equal to 0.01 percent; ni: 4.0 to 4.5 percent; cr: 15 to 16 percent; cu: 3.0 to 5.0 percent; mo is less than or equal to 0.5 percent; nb: 0.15 to 0.45 percent; pb is less than or equal to 0.01 percent; sn is less than or equal to 0.01 percent; as is less than or equal to 0.01 percent; bi is less than or equal to 0.01 percent; sb is less than or equal to 0.01 percent; the balance of Fe, and the material is proportioned well. And (3) putting the proportioned 17-4PH into a smelting furnace for smelting, adopting a smelting process of a VD furnace and an LF furnace, keeping the refining temperature of 1690 ℃ for 20min, keeping the tapping temperature of 1690 ℃, controlling the pouring temperature at the same time, adopting a slower cooling speed, and pouring into ingots after smelting. Then, referring to fig. 1, the ingot is forged for multiple times, the forging temperature of the 17-4PH base is 1195 ℃, and the process flow is as follows: blanking → secondary heating (17-4 PH ingot preheated at 880 ℃ for 2.5h, then transferred to a high temperature furnace to be heated to forging temperature and kept warm for 2 h.) → upsetting (deformation 20%) → pre-forging (deformation 20%) → secondary forging (deformation 20%) → final forging (deformation 20%) → furnace cooling. And finally, carrying out solid solution aging treatment on the forged 17-4PH base, heating the solid solution treatment to 1140 ℃ for solid solution, keeping the temperature for 3h, cooling the oil to room temperature, carrying out solid solution treatment to obtain a supersaturated copper and niobium martensite structure so as to obtain a certain degree of strengthening, then carrying out aging treatment, carrying out solid solution treatment, then carrying out aging at 630 ℃ for 3h, cooling the air to room temperature, precipitating supersaturated copper, niobium and other elements dissolved in the matrix structure, further strengthening the material, and finally carrying out a structure which is mainly martensite plus part-ferrite + -Cu and Nb precipitation phase so as to strengthen the base and improve the mechanical property.
Although the embodiments of the present invention have been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the invention, and all equivalent changes and modifications made within the scope of the present invention should be included in the scope of the present invention.
Claims (7)
1. A preparation method of a 17-4PH stainless steel base is characterized in that firstly, a 17-4PH material is subjected to component design, then smelting and casting are carried out according to components, forging quality and efficiency are improved through a treatment mode of combining multiple times of forging and solid solution aging treatment, and comprehensive mechanical properties of the base meet the use requirements of the base, and the preparation method specifically comprises the following steps:
1) designing components: the 17-4PH material comprises the following chemical components in percentage by weight: c is less than or equal to 0.07 percent; si is less than or equal to 1.0 percent; mn is less than or equal to 1.0 percent; p is less than or equal to 0.03 percent; s is less than or equal to 0.01 percent; ni: 3.0 to 5.0 percent; cr: 15 to 17.5 percent; cu: 3.0 to 5.0 percent; mo is less than or equal to 0.5; nb: 0.15 to 0.45 percent; pb is less than or equal to 0.01 percent; sn is less than or equal to 0.01 percent; as is less than or equal to 0.01 percent; bi is less than or equal to 0.01 percent; sb is less than or equal to 0.01 percent; the balance being Fe;
2) smelting and casting: putting the proportioned 17-4PH into a smelting furnace for smelting, adopting a VD furnace and LF furnace smelting process, and casting into an ingot after smelting;
3) forging for multiple times: then the cast ingot is forged, and the process flow is as follows: blanking → secondary heating → upsetting → preforging → secondary forging → finish forging → furnace cooling;
4) solid solution aging treatment: and heating the forged 17-4PH base to the austenite temperature for solution treatment, then cooling the base to the room temperature by oil, then performing aging treatment, and then cooling the base to the room temperature by air to obtain the finished product.
2. The method as claimed in claim 1, wherein in the step (1), the chemical composition and weight percentage of the 17-4PH material are controlled to satisfy the requirement of less than or equal to 5% by controlling the ferrite content, and the composition content is further limited, wherein the ratio of Ni: 4.0 to 4.5 percent; cr: 15 to 16 percent; c, taking an upper limit; the lower limit of Mo is taken.
3. The method as claimed in claim 1, wherein in the step (2), the 17-4PH stainless steel base is refined at 1670-.
4. The method as claimed in claim 1, wherein the forging temperature of the 17-4PH stainless steel base in the step (3) is 1175-1205 ℃.
5. The method as claimed in claim 1, wherein the secondary heating step (3) is carried out by preheating the 17-4PH ingot at 820-930 ℃ for 2-2.5h, transferring the ingot into a high temperature furnace, heating to the forging temperature and keeping the temperature for 1.5-2 h.
6. The method for preparing a 17-4PH stainless steel base of claim 1, wherein in the step (3), the multiple forging process: the deformation of upsetting, pre-forging, secondary forging and final forging is 10-20%.
7. The method of claim 1, wherein the solution and aging treatment in step (4): firstly heating to 1000-.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113477928A (en) * | 2021-07-06 | 2021-10-08 | 西安建筑科技大学 | Preparation method of high-strength and high-toughness martensitic precipitation hardening stainless steel |
| CN114855092A (en) * | 2022-07-05 | 2022-08-05 | 北京科技大学 | Additive manufacturing high-strength and high-toughness stainless steel and preparation process thereof |
| CN115011885A (en) * | 2022-06-09 | 2022-09-06 | 北京科技大学广州新材料研究院 | Stainless steel and preparation method thereof |
| CN115415524A (en) * | 2022-08-29 | 2022-12-02 | 苏州中耀科技有限公司 | Sintering method of 17-4PH stainless steel MIM (metal-insulator-metal) part |
| CN116334485A (en) * | 2023-03-21 | 2023-06-27 | 中航卓越锻造（无锡）有限公司 | High-strength high-toughness martensitic precipitation hardening stainless steel forging and manufacturing method thereof |
| CN116875905A (en) * | 2023-08-15 | 2023-10-13 | 北京科技大学 | Antimicrobial and microbial corrosion resistant 17-4PH stainless steel and heat treatment method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5149117A (en) * | 1974-10-25 | 1976-04-28 | Hitachi Ltd | SEKISHUTSUKOKAGATASUTENRESUKONO JINSEIKAIZENNETSUSHORIHO |
| CN102851609A (en) * | 2012-05-23 | 2013-01-02 | 江阴市恒润重工股份有限公司 | Material used in offshore wind power equipment, and workpiece manufacturing process |
| CN104357753A (en) * | 2014-12-01 | 2015-02-18 | 什邡新工金属材料有限公司 | Preparation technique of rare-earth 0Cr17Ni4Cu4Nb chemical fiber spinneret die steel |
| CN109439870A (en) * | 2018-12-26 | 2019-03-08 | 江阴市恒业锻造有限公司 | The method for improving 17-4PH martensite aged stainless steel forging low-temperature impact work based on organizational controls |
| CN110449542A (en) * | 2019-09-12 | 2019-11-15 | 哈尔滨工业大学 | A kind of outer circular edge belt length lug forging part manufacturing process |
-
2020
- 2020-06-12 CN CN202010533001.8A patent/CN111607734A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5149117A (en) * | 1974-10-25 | 1976-04-28 | Hitachi Ltd | SEKISHUTSUKOKAGATASUTENRESUKONO JINSEIKAIZENNETSUSHORIHO |
| CN102851609A (en) * | 2012-05-23 | 2013-01-02 | 江阴市恒润重工股份有限公司 | Material used in offshore wind power equipment, and workpiece manufacturing process |
| CN104357753A (en) * | 2014-12-01 | 2015-02-18 | 什邡新工金属材料有限公司 | Preparation technique of rare-earth 0Cr17Ni4Cu4Nb chemical fiber spinneret die steel |
| CN109439870A (en) * | 2018-12-26 | 2019-03-08 | 江阴市恒业锻造有限公司 | The method for improving 17-4PH martensite aged stainless steel forging low-temperature impact work based on organizational controls |
| CN110449542A (en) * | 2019-09-12 | 2019-11-15 | 哈尔滨工业大学 | A kind of outer circular edge belt length lug forging part manufacturing process |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113477928A (en) * | 2021-07-06 | 2021-10-08 | 西安建筑科技大学 | Preparation method of high-strength and high-toughness martensitic precipitation hardening stainless steel |
| CN115011885A (en) * | 2022-06-09 | 2022-09-06 | 北京科技大学广州新材料研究院 | Stainless steel and preparation method thereof |
| CN115011885B (en) * | 2022-06-09 | 2023-03-10 | 北京科技大学广州新材料研究院 | Stainless steel and preparation method thereof |
| CN114855092A (en) * | 2022-07-05 | 2022-08-05 | 北京科技大学 | Additive manufacturing high-strength and high-toughness stainless steel and preparation process thereof |
| CN115415524A (en) * | 2022-08-29 | 2022-12-02 | 苏州中耀科技有限公司 | Sintering method of 17-4PH stainless steel MIM (metal-insulator-metal) part |
| CN116334485A (en) * | 2023-03-21 | 2023-06-27 | 中航卓越锻造（无锡）有限公司 | High-strength high-toughness martensitic precipitation hardening stainless steel forging and manufacturing method thereof |
| CN116875905A (en) * | 2023-08-15 | 2023-10-13 | 北京科技大学 | Antimicrobial and microbial corrosion resistant 17-4PH stainless steel and heat treatment method thereof |
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