CN115852111A - Strengthening method of PH13-8Mo material - Google Patents
Strengthening method of PH13-8Mo material Download PDFInfo
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- CN115852111A CN115852111A CN202211667282.1A CN202211667282A CN115852111A CN 115852111 A CN115852111 A CN 115852111A CN 202211667282 A CN202211667282 A CN 202211667282A CN 115852111 A CN115852111 A CN 115852111A
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- 239000000463 material Substances 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000005728 strengthening Methods 0.000 title claims abstract description 26
- 239000000243 solution Substances 0.000 claims abstract description 65
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 239000006104 solid solution Substances 0.000 claims abstract description 18
- 230000032683 aging Effects 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 239000010935 stainless steel Substances 0.000 claims abstract description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 6
- 238000004881 precipitation hardening Methods 0.000 claims abstract description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 42
- 229910017604 nitric acid Inorganic materials 0.000 claims description 42
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 34
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 34
- 238000002161 passivation Methods 0.000 claims description 32
- 239000002253 acid Substances 0.000 claims description 29
- 238000005554 pickling Methods 0.000 claims description 22
- 238000005096 rolling process Methods 0.000 claims description 20
- 238000005498 polishing Methods 0.000 claims description 11
- 238000005406 washing Methods 0.000 claims description 11
- 238000007781 pre-processing Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 14
- 238000005260 corrosion Methods 0.000 abstract description 14
- 238000004140 cleaning Methods 0.000 description 9
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 229910052739 hydrogen Inorganic materials 0.000 description 7
- 239000001257 hydrogen Substances 0.000 description 7
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- 239000011651 chromium Substances 0.000 description 5
- 238000005488 sandblasting Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000002929 anti-fatigue Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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Abstract
The invention belongs to the technical field of stainless steel processing, and particularly relates to a strengthening method of a PH13-8Mo material. The method for strengthening the PH13-8Mo material comprises the following heat treatment steps: sequentially carrying out solid solution treatment, cooling and aging treatment on the blank; the blank is precipitation hardening stainless steel 0Cr13Ni8Mo2Al; the solid solution treatment is to keep the blank at 670-690 ℃ for 55-65 min, then heat the blank to 915-935 ℃ and keep the blank at the temperature for 55-65 min; and (3) performing cold treatment on the workpiece subjected to the solution treatment at a temperature of between 5 ℃ below zero and 5 ℃, and then performing aging treatment on the workpiece subjected to the solution treatment at a temperature of between 530 and 550 ℃ for 240 to 270min to obtain a heat-treated workpiece. The heat treatment process enables the PH13-8Mo material to have higher tensile strength, yield strength, impact toughness, fatigue resistance and corrosion resistance, and greatly improves the reliability of the material when the material is used for connection and fastening.
Description
Technical Field
The invention belongs to the technical field of stainless steel processing, and particularly relates to a strengthening method of a PH13-8Mo material.
Background
At present, due to the requirement of connection and fastening, ultrahigh-strength bolts are generally adopted in the fields of aerospace, deep sea engineering, high-speed rail, ships, petrochemical ultrahigh-pressure container connectors, shield tunneling machines and the like, and the requirement on the reliability of the bolts is high; the bolt material usually adopts alloy steel materials such as 30CrMnSiA and the like, although the materials can meet the strength requirement, the materials need to be electroplated to meet the corrosion prevention requirement in practical application, hydrogen is absorbed in the electroplating process due to a large amount of hydrogen contained in the electroplating solution, the materials have the risks of hydrogen brittleness and chromium brittleness in use, the thread is easy to be brittle and broken, and accidents are caused.
In order to solve the problem of hydrogen embrittlement of a 30CrMnSiA material in application, chinese invention patent CN 111020424B discloses a high-strength aluminum alloy bolt, and after two-stage solution treatment and two-stage aging treatment are carried out on an aluminum alloy bolt blank, the strength requirement that the tensile strength of a product is larger than or equal to 630MPa can be met, and the bearing requirement of an aerospace fastener can be met by related strength performance.
The PH13-8Mo material is precipitation hardening stainless steel, the domestic mark is 0Cr13Ni8Mo2Al, the mechanical property and the corrosion resistance are excellent, but in order to obtain the better mechanical property of the alloy, a proper strengthening processing technology is required, the processing method of the ultrahigh-strength bolt of the material is less at present, and the problem exists in batch processing.
Disclosure of Invention
The invention aims to provide a strengthening method of a PH13-8Mo material, so that the material has high strength and high corrosion resistance, and the problem that a 30CrMnSiA material is fractured due to hydrogen embrittlement in the application process in the prior art is solved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a strengthening method of a PH13-8Mo material comprises the following heat treatment steps: sequentially carrying out solid solution treatment, cooling and aging treatment on the blank; the blank is precipitation hardening stainless steel 0Cr13Ni8Mo2Al; the solid solution treatment is to keep the blank at 670-690 ℃ for 55-65 min, then heat the blank to 915-935 ℃ and keep the blank at the temperature for 55-65 min; and (3) performing cold treatment on the workpiece subjected to the solution treatment at a temperature of between 5 ℃ below zero and 5 ℃, and then performing aging treatment on the workpiece subjected to the solution treatment at a temperature of between 530 and 550 ℃ for 240 to 270min to obtain a heat-treated workpiece.
Through the heat treatment process, the PH13-8Mo material has higher tensile strength (1410-1560 MPa), yield strength, impact toughness, fatigue resistance and corrosion resistance, the reliability and safety of the material when used for connecting and fastening are greatly improved, and the problem of hydrogen embrittlement can be avoided.
Preferably, the solution treatment is performed under vacuum conditions.
In order to further improve the strength and toughness of the PH13-8Mo material, the cold treatment time is preferably 60-120 min.
Preferably, the method further comprises the step of passivating the heat-treated workpiece by using a passivation solution, wherein the passivation solution is a nitric acid passivation solution; the concentration of nitric acid in the nitric acid passivation solution is 400-500 g/L. The nitric acid passivation solution can form a chromium-rich passivation film on the surface of the PH13-8Mo material, so that the corrosion resistance of the PH13-8Mo material is improved.
In order to further improve the corrosion resistance of the PH13-8Mo material, preferably, before passivation, the heat-treated workpiece is pickled by using a pickling solution; the pickling solution is a mixed acid solution of nitric acid, sulfuric acid and hydrofluoric acid; the concentration of nitric acid in the pickling solution is 70-80 g/L, the concentration of sulfuric acid is 80-100 g/L, and the concentration of hydrofluoric acid is 40-50 g/L. Oxide skin formed after the heat treatment of the PH13-8Mo material can be removed by acid washing, the acid washing time is strictly controlled, and the oxide skin is completely removed; the acid washing time is 20-40 min.
In order to further improve the corrosion resistance of the PH13-8Mo material, the heat-treated workpiece is preferably subjected to polishing treatment after being acid-washed.
Preferably, the heat-treated workpiece is a fastener. The PH13-8Mo material has higher tensile strength, yield strength, impact toughness and corrosion resistance after heat treatment, greatly improves the reliability and safety of the material when used for connection and fastening, and can avoid the problem of hydrogen embrittlement.
Preferably, the fastener is a bolt.
Preferably, the bolt comprises the following processing steps: blanking, upsetting, heat treatment, acid washing, preprocessing, thread rolling, R rolling, flaw detection, polishing and passivation; the preprocessing comprises the steps of processing the size of a bolt polish rod, the size of a cap thickness and the diameter of a thread rolling blank. The thread rolling keeps the metal streamline of the bolt, so that the bolt has higher strength; the rolling R increases the anti-fatigue capability of the PH13-8Mo bolt, and the average fatigue life is not less than 6.5 ten thousand times; the bolts with crack defects can be removed during flaw detection, and the mass production of the ultrahigh-strength bolts is facilitated.
The PH13-8Mo bolt processed by the method has the tensile strength of 1410-1560 MPa, the fatigue resistance of 13 ten thousand times, and the salt spray test of more than 192 hours, can meet the use requirement under the condition of ultrahigh strength, has high corrosion resistance, and greatly improves the reliability and safety of threaded connection of key parts.
Preferably, the heading is hot heading, and the temperature is 600-800 ℃; the nut of the bolt is upset by a hot heading die, and the nut can be a hexagonal head, an internal hexagonal countersunk head, a dodecagonal head and the like.
Preferably, the hot heading is followed by grit blasting. The sand blasting treatment can remove oxide scales generated by PH13-8Mo materials in the hot heading process.
Detailed Description
The technical solution of the present invention will be further described with reference to the following embodiments.
1. The specific embodiment of the strengthening method of the PH13-8Mo material is as follows:
the sulfuric acid used in the examples of the present invention is a commercially available product, and has a concentration of 93 to 98%.
The nitric acid used in the examples of the present invention is a commercially available product, and has a concentration of 65 to 68%.
The hydrofluoric acid used in the examples of the present invention is a commercially available product, and has a concentration of 40 to 50%.
The electrochemical polishing solution adopted in the embodiment of the invention is Kai-Union environment-friendly electrochemical polishing solution.
Example 1
The strengthening method of the PH13-8Mo material comprises the following heat treatment steps: firstly, carrying out solid solution treatment on a PH13-8Mo material by using a vacuum furnace, wherein the solid solution temperature is 680 ℃, preserving heat for 55min, then heating to 925 ℃, preserving heat for 65min, carrying out oil cooling, and cooling for 10min; and after the solid solution is finished, performing cold treatment at 0 ℃ for 60min, wherein the time interval between the solid solution treatment and the cold treatment is not more than 1h, then performing aging treatment on the PH13-8Mo material by using an air furnace at 530 ℃, preserving the heat for 270min, and then performing air cooling to obtain a heat-treated workpiece.
The strengthening method for the PH13-8Mo material further comprises the step of passivating the heat-treated workpiece by using a passivation solution, and specifically comprises the following steps: firstly, pickling a heat-treated workpiece by using a pickling solution to remove oxide skins on the surface of the heat-treated workpiece, wherein the pickling solution is a mixed acid solution of nitric acid, sulfuric acid and hydrofluoric acid, the concentration of the nitric acid in the pickling solution is 70g/L, the concentration of the sulfuric acid is 100g/L, the concentration of the hydrofluoric acid is 40g/L, and the pickling time is 30min; after acid washing, performing electro-polishing treatment on the PH13-8Mo material by using an electrochemical polishing solution; and finally, passivating the PH13-8Mo material by using a nitric acid passivation solution, wherein the concentration of nitric acid in the nitric acid passivation solution is 400g/L, so that a chromium-rich passivation film can be formed on the surface of the PH13-8Mo material, and the corrosion resistance of the PH13-8Mo material is improved.
The PH13-8Mo material of the embodiment is an ultrahigh-strength bolt with the specification of M8, and comprises the following processing steps:
(1) Preparing materials: selecting a PH13-8Mo round bar material with the diameter of 8.5 mm;
(2) General vehicle: processing the bar stock before upsetting according to the single-piece consumption required by the bolt;
(3) Hot upsetting: heating a PH13-8Mo round bar material to 600 ℃ by using a heating coil, and upsetting a hexagonal head nut of the bolt by using a hot upsetting die;
(4) Sand blasting: removing oxide skin generated in the hot heading process;
(5) And (3) heat treatment: carrying out heat treatment on the PH13-8Mo round bar material by adopting the heat treatment process;
(6) Acid washing: acid cleaning is carried out on the PH13-8Mo round bar stock by using mixed acid liquor of nitric acid, sulfuric acid and hydrofluoric acid, wherein the concentration of the nitric acid in the acid cleaning solution is 70g/L, the concentration of the sulfuric acid is 100g/L, the concentration of the hydrofluoric acid is 40g/L, and the acid cleaning time is 30min;
(7) Numerically controlled vehicle: machining the size of a bolt polish rod, the size of the cap thickness and the diameter of a thread rolling blank by using a numerical control lathe;
(8) Thread rolling: rolling the thread of the bolt by using a thread rolling machine;
(9) Rolling R: rolling the transitional R angle of the screw cap and the bolt polish rod by using an R rolling machine;
(10) Flaw detection: removing bolts with possible crack defects by using nondestructive testing;
(11) Electropolishing: carrying out electro-polishing treatment on the PH13-8Mo bolt by using an electrochemical polishing solution;
(12) Passivation: and passivating the PH13-8Mo bolt by using a nitric acid passivation solution, wherein the concentration of nitric acid in the nitric acid passivation solution is 400g/L.
In other embodiments, the hot heading temperature may be adjusted to 650 ℃, 680 ℃, 700 ℃, 750 ℃, 800 ℃ in step (3); the nut can be an internal hexagon countersunk head or a dodecagonal head.
Example 2
The strengthening method of the PH13-8Mo material comprises the following heat treatment steps: firstly, carrying out solid solution treatment on a PH13-8Mo material by using a vacuum furnace, wherein the solid solution temperature is 670 ℃, preserving heat for 60min, then heating to 915 ℃, preserving heat for 60min, and carrying out oil cooling, wherein the cooling time is 10min; and after the solid solution is finished, performing cold treatment at the temperature of minus 5 ℃ for 90min, wherein the time interval between the solid solution treatment and the cold treatment is not more than 1h, then performing aging treatment on the PH13-8Mo material by using an air furnace at the aging temperature of 540 ℃, and performing air cooling after heat preservation for 250min to obtain a heat-treated workpiece.
The strengthening method for the PH13-8Mo material further comprises the step of passivating the heat-treated workpiece by using a passivation solution, and specifically comprises the following steps: firstly, pickling a heat-treated workpiece by using a pickling solution to remove oxide skins on the surface of the heat-treated workpiece, wherein the pickling solution is a mixed acid solution of nitric acid, sulfuric acid and hydrofluoric acid, the concentration of the nitric acid in the pickling solution is 70g/L, the concentration of the sulfuric acid is 80g/L, the concentration of the hydrofluoric acid is 50g/L, and the pickling time is 30min; after acid washing, performing electropolishing treatment on the PH13-8Mo material by using electrochemical polishing solution; and finally, passivating the PH13-8Mo material by using a nitric acid passivation solution, wherein the concentration of nitric acid in the nitric acid passivation solution is 450g/L, so that a chromium-rich passivation film can be formed on the surface of the PH13-8Mo material, and the corrosion resistance of the PH13-8Mo material is improved.
The PH13-8Mo material of the embodiment is an ultrahigh-strength bolt with the specification of M8, and comprises the following processing steps:
(1) Preparing materials: selecting a PH13-8Mo round bar material with the diameter of 8.5 mm;
(2) General vehicle: processing the bar stock before upsetting according to the single-piece consumption required by the bolt;
(3) Hot upsetting: heating a PH13-8Mo round bar material to 600 ℃ by using a heating coil, and upsetting a dodecagonal head nut of the bolt by using a hot upsetting die;
(4) Sand blasting: removing oxide skin generated in the hot heading process;
(5) And (3) heat treatment: carrying out heat treatment on the PH13-8Mo round bar material by adopting the heat treatment process;
(6) Acid washing: acid cleaning is carried out on the PH13-8Mo round bar stock by using mixed acid liquor of nitric acid, sulfuric acid and hydrofluoric acid, wherein the concentration of the nitric acid in the acid cleaning solution is 70g/L, the concentration of the sulfuric acid is 80g/L, the concentration of the hydrofluoric acid is 50g/L, and the acid cleaning time is 30min;
(7) And (3) numerical control vehicle: machining the size of a bolt polish rod, the size of the cap thickness and the diameter of a thread rolling blank by using a numerical control lathe;
(8) Thread rolling: rolling the thread of the bolt by using a thread rolling machine;
(9) Rolling R: rolling the transitional R angle of the screw cap and the bolt polish rod by using an R rolling machine;
(10) Flaw detection: removing bolts with possible crack defects by using nondestructive testing;
(11) And (3) electropolishing: carrying out electropolishing treatment on the PH13-8Mo bolt by using electrochemical polishing solution;
(12) Passivation: and passivating the PH13-8Mo bolt by using a nitric acid passivation solution, wherein the concentration of nitric acid in the nitric acid passivation solution is 450g/L.
Example 3
The strengthening method of the PH13-8Mo material of the embodiment comprises the following heat treatment steps: firstly, carrying out solid solution treatment on a PH13-8Mo material by using a vacuum furnace, wherein the solid solution temperature is 690 ℃, preserving heat for 65min, then heating to 935 ℃, preserving heat for 55min, and carrying out oil cooling for 10min; and (3) after the solid solution is finished, performing cold treatment at the temperature of 5 ℃ for 60min, wherein the time interval between the solid solution treatment and the cold treatment is not more than 1h, then performing aging treatment on the PH13-8Mo material by adopting an air furnace at the aging temperature of 550 ℃, and performing heat preservation for 240min for air cooling to obtain a heat-treated workpiece.
The strengthening method for the PH13-8Mo material further comprises the step of passivating the heat-treated workpiece by using a passivation solution, and specifically comprises the following steps: firstly, pickling a heat-treated workpiece by using a pickling solution to remove oxide skins on the surface of the heat-treated workpiece, wherein the pickling solution is a mixed acid solution of nitric acid, sulfuric acid and hydrofluoric acid, the concentration of the nitric acid in the pickling solution is 80g/L, the concentration of the sulfuric acid is 90g/L, the concentration of the hydrofluoric acid is 40g/L, and the pickling time is 30min; after acid washing, performing electro-polishing treatment on the PH13-8Mo material by using an electrochemical polishing solution; and finally, passivating the PH13-8Mo material by using a nitric acid passivation solution, wherein the concentration of nitric acid in the nitric acid passivation solution is 500g/L, so that a chromium-rich passivation film can be formed on the surface of the PH13-8Mo material, and the corrosion resistance of the PH13-8Mo material is improved.
The PH13-8Mo material of the embodiment is an ultrahigh-strength bolt with the specification of M8, and comprises the following processing steps:
(1) Preparing materials: selecting a PH13-8Mo round bar material with the diameter of 8.5 mm;
(2) General vehicle: processing the bar stock before upsetting according to the single-piece consumption required by the bolt;
(3) Hot upsetting: heating a PH13-8Mo round bar material to 600 ℃ by using a heating coil, and upsetting an inner hexagon countersunk head nut of the bolt by using a hot upsetting die;
(4) Sand blasting: removing oxide skin generated in the hot heading process;
(5) And (3) heat treatment: carrying out heat treatment on the PH13-8Mo round bar material by adopting the heat treatment process;
(6) Acid washing: acid cleaning is carried out on the PH13-8Mo round bar stock by using mixed acid liquor of nitric acid, sulfuric acid and hydrofluoric acid, wherein the concentration of the nitric acid in the acid cleaning solution is 80g/L, the concentration of the sulfuric acid is 90g/L, the concentration of the hydrofluoric acid is 40g/L, and the acid cleaning time is 30min;
(7) Numerically controlled vehicle: machining the size of a bolt polish rod, the size of a cap thickness and the diameter of a thread rolling blank by using a numerical control lathe;
(8) Thread rolling: rolling the thread of the bolt by using a thread rolling machine;
(9) Rolling R: rolling a transitional R angle of a nut and a bolt polished rod by using an R rolling machine;
(10) Flaw detection: removing bolts with possible crack defects by using nondestructive testing;
(11) Electropolishing: carrying out electropolishing treatment on the PH13-8Mo bolt by using electrochemical polishing solution;
(12) Passivation: and passivating the PH13-8Mo bolt by using a nitric acid passivation solution, wherein the concentration of nitric acid in the nitric acid passivation solution is 500g/L.
2. Comparative example
Comparative example 1
The method for strengthening the PH13-8Mo material of the comparative example is different from that of example 1 in that: example 1 solution heat treatment was carried out in a vacuum furnace, and the solution heat treatment of the comparative examples PH13-8Mo material was carried out in an air furnace.
3. Examples of the experiments
Experimental example 1
The experimental example tests the mechanical properties and corrosion resistance of the bolts processed by the PH13-8Mo materials in examples 1-3 and comparative example 1, and the specific results are shown in Table 1:
TABLE 1 Properties of bolts processed with PH13-8Mo materials in examples 1-3 and comparative example 1
Compared with the comparative example 1, the bolts processed by the PH13-8Mo material in the examples 1-3 have higher tensile strength and yield strength and excellent corrosion resistance, and the reliability and safety of the material used for connection and fastening are greatly improved.
Claims (10)
1. A strengthening method of a PH13-8Mo material is characterized by comprising the following heat treatment steps: sequentially carrying out solid solution treatment, cooling and aging treatment on the blank; the blank is precipitation hardening stainless steel 0Cr13Ni8Mo2Al;
the solid solution treatment is to keep the blank at 670-690 ℃ for 55-65 min, then heat the blank to 915-935 ℃ and keep the blank at the temperature for 55-65 min; and (3) performing cold treatment on the workpiece subjected to the solution treatment at a temperature of between 5 ℃ below zero and 5 ℃, and then performing aging treatment on the workpiece subjected to the solution treatment at a temperature of between 530 and 550 ℃ for 240 to 270min to obtain a heat-treated workpiece.
2. The method for strengthening a PH13-8Mo material of claim 1, wherein the solution treatment is performed under vacuum condition.
3. The method for strengthening a PH13-8Mo material of claim 1, wherein the cold treatment time is 60-120 min.
4. The method for strengthening the PH13-8Mo material according to claim 1, further comprising passivating the heat-treated workpiece with a passivating solution, wherein the passivating solution is a nitric acid passivating solution; the concentration of nitric acid in the nitric acid passivation solution is 400-500 g/L.
5. The method for strengthening the PH13-8Mo material according to claim 4, wherein the heat-treated workpiece is pickled with pickling solution before passivation; the pickling solution is a mixed acid solution of nitric acid, sulfuric acid and hydrofluoric acid; the concentration of nitric acid in the pickling solution is 70-80 g/L, the concentration of sulfuric acid is 80-100 g/L, and the concentration of hydrofluoric acid is 40-50 g/L.
6. The method for strengthening PH13-8Mo material according to claim 5, wherein the heat-treated workpiece is further subjected to polishing treatment after acid pickling.
7. The method for strengthening a PH13-8Mo material according to any one of claims 1-6, wherein the heat-treated workpiece is a fastener.
8. The method for strengthening PH13-8Mo material of claim 7, wherein said fastening member is a bolt.
9. The method for strengthening PH13-8Mo material according to claim 8, wherein the bolt comprises the following processing steps: blanking, upsetting, heat treatment, acid washing, preprocessing, thread rolling, R rolling, flaw detection, polishing and passivation; the preprocessing comprises the steps of processing the size of a bolt polish rod, the size of a cap thickness and the diameter of a thread rolling blank.
10. The method for strengthening a PH13-8Mo material of claim 9, wherein the upsetting is hot upsetting and the temperature is 600-800 ℃.
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| 中国机械工程学会铸造专业学会编: "铸造手册", 31 December 1991, 机械工业出版社, pages: 397 * |
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