CN117144093A - Martensitic precipitation strengthening stainless steel, heat treatment method for improving hardness of martensitic precipitation strengthening stainless steel and application of martensitic precipitation strengthening stainless steel - Google Patents
Martensitic precipitation strengthening stainless steel, heat treatment method for improving hardness of martensitic precipitation strengthening stainless steel and application of martensitic precipitation strengthening stainless steel Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 61
- 229910000734 martensite Inorganic materials 0.000 title claims abstract description 54
- 239000010935 stainless steel Substances 0.000 title claims abstract description 46
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 46
- 238000005728 strengthening Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000001556 precipitation Methods 0.000 title abstract description 25
- 238000001816 cooling Methods 0.000 claims abstract description 34
- 230000032683 aging Effects 0.000 claims abstract description 31
- 239000006104 solid solution Substances 0.000 claims abstract description 18
- 238000007599 discharging Methods 0.000 claims abstract description 15
- 230000007797 corrosion Effects 0.000 claims description 8
- 238000005260 corrosion Methods 0.000 claims description 8
- 238000005496 tempering Methods 0.000 claims description 8
- 239000003595 mist Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000243 solution Substances 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 238000004321 preservation Methods 0.000 description 9
- 239000011159 matrix material Substances 0.000 description 8
- 229910001566 austenite Inorganic materials 0.000 description 6
- 230000002431 foraging effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000011160 research Methods 0.000 description 4
- 230000001427 coherent effect Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001550 time effect Effects 0.000 description 1
Classifications
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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
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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
-
- 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
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
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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
- 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
- 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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- 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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- Chemical & Material Sciences (AREA)
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- Mechanical Engineering (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention belongs to the technical field of precipitation strengthening stainless steel heat treatment, and particularly relates to martensitic precipitation strengthening stainless steel, a heat treatment method for improving the hardness of the martensitic precipitation strengthening stainless steel and application of the martensitic precipitation strengthening stainless steel. The heat treatment method for improving the hardness of the martensitic precipitation-strengthening stainless steel provided by the invention comprises the following steps: (1) Heating the blank to 1025-1055 deg.C, and keeping the temperature for 30+D/25×30 ～ (60+D/25×30) min, and not less than 1h; wherein D is the diameter or equivalent thickness of the blank; (2) After the solid solution time is up, cooling the blank to below 25 ℃; (3) Aging the blank, heating the blank to 410+/-10 ℃ at the speed of 2-6 ℃/min, and preserving heat for 4-12h; (4) And after the aging treatment time is up, discharging, and cooling to room temperature in air. The heat treatment method for improving the hardness of the martensitic precipitation-strengthening stainless steel does not need to add extra steps after solution treatment, and also improves the hardness to 48-50HRC, saves energy and reduces cost.
Description
Technical Field
The invention belongs to the technical field of precipitation strengthening stainless steel heat treatment, and particularly relates to martensitic precipitation strengthening stainless steel, a heat treatment method for improving the hardness of the martensitic precipitation strengthening stainless steel and application of the martensitic precipitation strengthening stainless steel.
Background
The martensitic precipitation strengthening stainless steel has high strength and hardness, and also has good plasticity and toughness, corrosion resistance and processability, so that the martensitic precipitation strengthening stainless steel is widely applied to manufacturing high-strength corrosion-resistant parts working below 400 ℃ in the fields of aerospace, petrochemical industry, nuclear industry, energy sources and the like, such as blades, casings, shaft parts, offshore platforms, helicopter decks and the like. After the martensitic precipitation strengthening stainless steel is subjected to solution treatment, a matrix mainly comprises a martensitic structure and a small amount of residual austenite, cu element is dissolved in the matrix in a solid solution mode, and the Cu element is precipitated from the matrix in an epsilon-Cu form during subsequent aging treatment and is coherent with the matrix, so that a strengthening effect is generated.
Numerous current research results show that the material has the highest hardness, but generally does not exceed 45HRC, when incubated for 1h at an ageing temperature of 480 ℃. However, in some applications, such as shafts used underwater, it is desirable to achieve higher hardness to increase wear resistance and service life. In general, the strength of such martensitic precipitation-strengthened steels is improved by increasing the content of martensite from the retained austenite in a solid solution state, thereby improving the overall hardness after aging. The method is realized by adjusting the temperature of about 815 ℃ after solid solution and before aging or by adding a deep cooling treatment process of 0 ℃ or below after solid solution, and has the defects of multiple steps, high production cost and the like.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art and provides a martensitic precipitation strengthening stainless steel, a heat treatment method for improving the hardness of the martensitic precipitation strengthening stainless steel and application of the martensitic precipitation strengthening stainless steel.
Specifically, the heat treatment method for improving the hardness of the martensitic precipitation-strengthening stainless steel provided by the invention comprises the following steps:
(1) Heating the blank to 1025-1055 deg.C, and keeping the temperature for 30+D/25×30 ～ (60+D/25×30) min, and not less than 1h; wherein D is the diameter or equivalent thickness of the blank;
(2) After the solid solution time is up, cooling the blank to below 25 ℃;
(3) Aging the blank, heating the blank to 410+/-10 ℃ at the speed of 2-6 ℃/min, and preserving heat for 4-12h;
(4) And after the aging treatment time is up, discharging, and cooling to room temperature in air.
According to the heat treatment method for improving the hardness of the martensitic precipitation-strengthening stainless steel, in the step (1), the heating temperature of the blank is 1035-1045 ℃, and the heat preservation time is (30+D/25 multiplied by 30) min and is not less than 1h.
According to the heat treatment method for improving the hardness of the martensitic precipitation-strengthening stainless steel, the blank in the step (3) is heated to 410+/-5 ℃ at the speed of 3-5 ℃/min, and the temperature is kept for 5-10h.
The cooling in the step (2) is one of natural cooling, water mist cooling and cold air cooling.
In the heat treatment method for improving the hardness of the martensitic precipitation-strengthening stainless steel, a tempering furnace is adopted in the step (3) to heat the blank.
In another aspect, the present invention provides a martensitic precipitation-strengthened stainless steel treated by the heat treatment method described above.
The hardness of the martensitic precipitation-strengthening stainless steel is 48-50HRC.
The martensitic precipitation-strengthened stainless steel is 05Cr17Ni4Cu4Nb.
In still another aspect, the invention also provides application of the martensitic precipitation-strengthening stainless steel in preparing a high-strength corrosion-resistant part.
The high-strength corrosion-resistant parts comprise blades, a casing, shaft parts, an offshore platform and a helicopter deck.
The technical scheme of the invention has the following beneficial effects:
the heat treatment method for improving the hardness of the martensitic precipitation-strengthening stainless steel does not need to add extra steps after solution treatment, and also improves the hardness to 48-50HRC, saves energy and reduces cost.
Detailed Description
The present invention will be described in detail with reference to the following embodiments for a full understanding of the objects, features, and effects of the present invention. The process of the present invention is carried out by methods or apparatus conventional in the art, except as described below. The following terms have the meanings commonly understood by those skilled in the art unless otherwise indicated.
When a range of values is disclosed in the present invention, the range is considered to be continuous and includes the minimum and maximum values of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range description features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to encompass any and all subranges subsumed therein.
Aiming at the strengthening mechanism of the martensitic precipitation strengthening stainless steel, the inventor of the invention carefully researches the characteristics of the materials, and carries out deep analysis and research on the heat treatment process and the precipitation phase, and provides a heat treatment method for improving the hardness of the martensitic precipitation strengthening stainless steel, which is mainly based on the following conception:
after solution treatment, the matrix is mainly martensitic structure and a small amount of retained austenite, and after aging, the material is transformed into tempered martensite, epsilon-Cu and contravariant austenite. The time-effect temperature is generally 480-620 ℃. As the aging temperature increases, the size of the precipitated phase epsilon-Cu gradually increases from nano level, and the relation between the precipitated phase epsilon-Cu and a matrix is changed from coherent to non-coherent, so that the strength and the hardness of the alloy are gradually reduced, and the toughness of the alloy is improved. According to the existing research results, the highest hardness appears at 480 ℃ and aging is carried out for 1h. Accordingly, the current approach to improving the strength of such martensitic precipitation-strengthened steels is to start with a reduction in the residual austenite in its solid solution state, and to increase the hardness in the solid solution state by increasing the martensite content, thereby increasing the overall hardness after aging. The method is realized by adjusting the temperature of about 815 ℃ after solid solution and before aging or by adding a deep cooling treatment process of 0 ℃ or below after solid solution.
The key point of the invention is not to increase the martensite content, but to control the epsilon-Cu precipitated phase during aging. After aging for 1h at 480 ℃, the size of the epsilon-Cu precipitated phase is nano-scale, which is observed under TEM, but the time-efficiency temperature is reduced to 410+/-10 ℃, the heat preservation time is increased to 4-12h, at this time, no precipitated phase is observed under TEM, and only slight shadow exists, namely, the precipitated phase is not completely formed at this time, but the hardness of the material can be increased to 48-50HRC at this time. The strengthening mechanism at this time is not precipitation phase dispersion strengthening in the conventional sense, but atomic enrichment GP zone strengthening. The invention can make the hardness of the material reach a higher level by only reducing the aging temperature and prolonging the aging time.
Specifically, the heat treatment method for improving the hardness of the martensitic precipitation-strengthening stainless steel comprises the following steps:
(1) Heating the blank to 1025-1055 deg.C, and keeping the temperature for 30+D/25×30 ～ (60+D/25×30) min, and not less than 1h; wherein D is the diameter or equivalent thickness of the blank;
(2) After the solid solution time is up, cooling the blank to below 25 ℃;
(3) Aging the blank, heating the blank to 410+/-10 ℃ at the speed of 2-6 ℃/min, and preserving heat for 4-12h;
(4) And after the aging treatment time is up, discharging, and cooling to room temperature in air.
In some preferred embodiments, the heat treatment method for increasing the hardness of martensitic precipitation-strengthening stainless steel of the present invention comprises:
(1) Heating the blank to 1025-1055 deg.C, and keeping the temperature for 30+D/25×30 ～ (60+D/25×30) min, and not less than 1h; wherein D is the diameter or equivalent thickness of the blank.
The step is solution treatment, so that Cu element can be completely and uniformly dissolved in the matrix, and the precipitated phase during aging treatment can be more uniform.
When the value of D is smaller than 25, the calculated heat preservation duration is smaller than 1h, and the heat preservation duration is 1h.
Preferably, the heating temperature of the blank is 1035-1045 ℃, and the heat preservation time is (30+D/25×30) min and is not less than 1h.
Optionally, the heating is performed in a high temperature furnace.
Optionally, the blank is a 05Cr17Ni4Cu4Nb bar or plate.
(2) After the solution time is reached, the blank is cooled to below 25 ℃.
The invention aims to cool the blank below 25 ℃ so that the austenite structure formed at high temperature can be completely converted into martensite.
Wherein, the cooling is one of natural cooling, water mist cooling and cold air blowing cooling.
Preferably, the cold area is cooled by water mist or cold air blowing, thereby accelerating the cooling speed of the blank.
(3) Aging the blank, heating the blank to 410+/-10 ℃ at the speed of 2-6 ℃/min, and preserving heat for 4-12h;
the aging treatment of the blank is performed to separate Cu dissolved in martensite from a matrix to form an atomic enrichment region.
When the temperature rising speed of the blank is too small, the time is too long; when the temperature rising speed of the blank is too high, the workpiece is easy to crack. When the temperature of the blank is too small, cu atoms cannot be separated out; when the temperature of the blank is too high, an epsilon-Cu precipitated phase is directly formed. When the heat preservation time is too short, cu atoms are not separated out; when the heat preservation time is too long, an epsilon-Cu precipitated phase is directly formed. Preferably, the temperature rising speed of the blank is 3-5 ℃/min, the heat preservation temperature of the blank is 410+/-5 ℃, and the heat preservation time is 5-10h.
Optionally, the blank is heated by a tempering furnace.
(4) And after the aging treatment time is up, discharging, and cooling to room temperature in air.
Through practice, compared with the traditional aging treatment at 480 ℃ for 1h, the method can improve the hardness of 05Cr17Ni4Cu4Nb from less than 45HRC to 48-50HRC, does not need the procedures of adjusting treatment at 815 ℃ or cryogenic treatment at 0 ℃ or below after solid solution, saves energy and reduces cost.
On the other hand, the invention also provides the martensitic precipitation strengthening stainless steel, which is treated by adopting the heat treatment method.
The martensitic precipitation-strengthening stainless steel obtained by the heat treatment method of the invention has the hardness of 48-50HRC.
Preferably, the martensitic precipitation-strengthening stainless steel is 05Cr17Ni4Cu4Nb.
Preferably, the martensitic precipitation-strengthening stainless steel comprises, in weight percent: c is less than or equal to 0.07%, si is less than or equal to 1.00%, mn is less than or equal to 1.00%, P is less than or equal to 0.040%, S is less than or equal to 0.030%, cr:15.00-17.50%, ni:3.00-5.00%, cu:3.00-5.00%, nb:0.15-0.45%, and the balance of iron and unavoidable impurities.
In still another aspect, the invention further provides an application of the martensitic precipitation-strengthening stainless steel in preparing a high-strength corrosion-resistant part.
The high-strength corrosion-resistant parts comprise blades, a casing, shaft parts, an offshore platform and a helicopter deck.
Examples
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention. The experimental methods without specific conditions noted in the following examples follow conventional methods and conditions.
Example 1
Step one: and (3) placing the 05Cr17Ni4Cu4Nb bar blank with the diameter of 22mm into a heating furnace, heating to 1038 ℃, and preserving heat for 1h.
Step two: and after the solid solution heating is completed, discharging and naturally cooling to the room temperature of 23 ℃ in the air.
Step three: and (3) transferring the bar stock into a tempering furnace for aging treatment, heating to 412 ℃ at a speed of 5 ℃/min, and preserving the heat for 6 hours.
Step four: and after the aging treatment time is up, discharging the steel plate from the furnace, and cooling the steel plate to room temperature in air.
The hardness was measured at 49HRC.
Example 2
Step one: and (3) placing the 05Cr17Ni4Cu4Nb bar blank with the diameter of 55mm into a heating furnace, heating to 1041 ℃, and preserving heat for 2 hours.
Step two: and after the solid solution heating is finished, discharging, and forced air cooling to the room temperature of 21 ℃ in air by adopting an air cooler.
Step three: and (3) transferring the bar stock into a tempering furnace for aging treatment, heating to 409 ℃ at a speed of 3 ℃/min, and preserving the heat for 8 hours.
Step four: and after the aging treatment time is up, discharging the steel plate from the furnace, and cooling the steel plate to room temperature in air.
The hardness was measured at 48.5HRC.
Comparative example 1
Step one: and (3) placing the 05Cr17Ni4Cu4Nb bar blank with the diameter of 30mm into a heating furnace, heating to 1040 ℃, and preserving heat for 1.5h.
Step two: and after the solid solution heating is completed, discharging, and air cooling to room temperature of 22 ℃ in the air.
Step three: and (3) transferring the bar stock into a tempering furnace for aging treatment, heating to 480 ℃ at a speed of 3 ℃/min, and preserving the heat for 1h.
Step four: and after the aging treatment time is up, discharging the steel plate from the furnace, and cooling the steel plate to room temperature in air.
The hardness was measured to be 44HRC.
Comparative example 2
Step one: and (3) placing the 05Cr17Ni4Cu4Nb bar blank with the thickness of 35mm into a heating furnace, heating to 1040 ℃, and preserving heat for 100min.
Step two: and after the solid solution heating is completed, discharging, and air cooling to the room temperature of 23 ℃ in the air.
Step three: and (3) transferring the bar stock into a tempering furnace for aging treatment, heating to 370 ℃ at a speed of 4 ℃/min, and preserving the heat for 7h.
Step four: and after the aging treatment time is up, discharging the steel plate from the furnace, and cooling the steel plate to room temperature in air.
The hardness was measured at 33HRC.
Comparative example 3
Step one: putting the 05Cr17Ni4Cu4Nb plate with the thickness of 10mm into a heating furnace, heating to 1042 ℃, and preserving heat for 1h.
Step two: and after the solid solution heating is finished, discharging, and forced air cooling to the room temperature of 23 ℃ in air by adopting an air cooler.
Step three: and (3) transferring the plate into a tempering furnace for aging treatment, heating to 415 ℃ at a speed of 5 ℃/min, and preserving the heat for 3 hours.
Step four: and after the aging treatment time is up, discharging the steel plate from the furnace, and cooling the steel plate to room temperature in air.
The hardness was measured at 45HRC.
The present invention has been disclosed above in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions equivalent to those of the embodiments are considered to be covered by the scope of the claims of the present invention. The scope of the invention should, therefore, be determined with reference to the appended claims.
Claims (10)
1. A heat treatment method for improving the hardness of a martensitic precipitation-strengthening stainless steel, comprising:
(1) Heating the blank to 1025-1055 deg.C, and keeping the temperature for 30+D/25×30 ～ (60+D/25×30) min, and not less than 1h; wherein D is the diameter or equivalent thickness of the blank;
(2) After the solid solution time is up, cooling the blank to below 25 ℃;
(3) Aging the blank, heating the blank to 410+/-10 ℃ at the speed of 2-6 ℃/min, and preserving heat for 4-12h;
(4) And after the aging treatment time is up, discharging, and cooling to room temperature in air.
2. The heat treatment method according to claim 1, wherein the heating temperature of the blank in step (1) is 1035 to 1045 ℃, and the holding time is (30+d/25 x 30) min and is not less than 1h.
3. The heat treatment method according to claim 1, wherein the blank in step (3) is heated to 410.+ -. 5 ℃ at a rate of 3-5 ℃ per minute and is kept for 5-10 hours.
4. The heat treatment method according to claim 1, wherein the cooling in the step (2) is one of natural cooling, mist cooling and cold air cooling.
5. The heat treatment method according to claim 1, wherein the blank is heated in step (3) by a tempering furnace.
6. A martensitic precipitation-strengthened stainless steel, characterized by being treated by the heat treatment method according to any one of claims 1 to 5.
7. The martensitic precipitation-strengthened stainless steel of claim 6, wherein the hardness is 48-50HRC.
8. The martensitic precipitation-strengthened stainless steel of claim 6, wherein the martensitic precipitation-strengthened stainless steel is 05Cr17Ni4Cu4Nb.
9. Use of a martensitic precipitation-strengthened stainless steel according to any one of claims 6-8 for the manufacture of a high strength corrosion resistant part.
10. The use according to claim 9, the high strength corrosion resistant parts comprising blades, casings, shaft-like parts, offshore platforms, helicopter decks.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311123787.6A CN117144093A (en) | 2023-09-01 | 2023-09-01 | Martensitic precipitation strengthening stainless steel, heat treatment method for improving hardness of martensitic precipitation strengthening stainless steel and application of martensitic precipitation strengthening stainless steel |
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| CN202311123787.6A CN117144093A (en) | 2023-09-01 | 2023-09-01 | Martensitic precipitation strengthening stainless steel, heat treatment method for improving hardness of martensitic precipitation strengthening stainless steel and application of martensitic precipitation strengthening stainless steel |
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