CN112609124A - 1Cr17Ni2 stainless steel screw and heat treatment process thereof - Google Patents
1Cr17Ni2 stainless steel screw and heat treatment process thereof Download PDFInfo
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
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- 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
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- 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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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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- 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
Abstract
The invention relates to a development and improvement method of a heat treatment process of a martensitic stainless steel 1Cr17Ni2 screw. The invention greatly reduces the quenching and tempering temperature by improving the heat treatment process parameters such as quenching temperature, tempering temperature, quenching medium and the like, changes the original oil medium quenching into F2000 water-based liquid quenching, strictly controls the use temperature of the water-based liquid, and quickly immerses the austenitized workpiece into the water-based liquid for cooling so as to obtain the heat treatment process method for martensite transformation. The invention improves the mechanical property index of 1Cr17Ni2 material products, greatly improves the one-time qualification rate, the qualification rate reaches more than 98 percent, greatly reduces the electricity consumption cost due to greatly reducing the quenching and tempering temperature, solves the problem that the original heat-treated parts can not be produced because the surface cracks directly, and the property index meets the requirement of design drawings after the process is improved. The water-based liquid is used for cooling, so that the environmental pollution is avoided, and the medium consumption cost is reduced.
Description
Technical Field
The invention relates to a heat treatment process of 1Cr17Ni2 martensitic stainless steel parts, in particular to a heat treatment process for quenching and cooling austenitized martensitic stainless steel 1Cr17Ni2 screw parts by using F2000 water-based liquid to finish martensitic transformation, and belongs to the technical field of heat treatment processes.
Background
The 1Cr17Ni2 material is a martensitic stainless steel with high strength and toughness, good hardenability and obvious temper brittleness. The 1Cr17Ni2 material is widely used in engineering anchor windlass brake screw rods or screw rod parts, the technical requirements of the material are generally thermal refining, and the performance index parameters of design drawings are generally as follows: the tensile strength Rm is more than or equal to 780Mpa, the yield strength Rp0.2 is more than or equal to 590Mpa, the elongation A is more than or equal to 15%, the impact energy Aku is more than or equal to 39J, and the hardness HB is more than or equal to 229.
The conventional heat treatment process generally adopts the quenching temperature of 980-1000 ℃, quenching is carried out after heat preservation, and the quenching cooling mode adopts 15# engine oil for cooling. The tempering temperature is 680 ℃, and the cooling is oil cooling. However, the quenching and tempering temperature of the conventional heat treatment is high, the energy consumption is large, and a large amount of harmful gas is discharged by oil combustion during quenching, so that the body health of people is greatly influenced, and the environment is also seriously polluted.
More importantly, the parts treated by the conventional heat treatment method have very poor comprehensive mechanical properties and often cannot meet the design requirements, particularly the impact energy cannot reach the design index, the qualification rate is less than 10 percent, cracks are generated on the surface, and the scrappage is very large.
Disclosure of Invention
The invention aims to: aiming at the defects in the prior art, a stainless steel screw and a heat treatment process thereof are provided.
In order to achieve the aim, the invention provides a stainless steel screw which is made of 1Cr17Ni2 material and comprises the following components in percentage by mass: 0.11-0.17% of C, less than or equal to 0.80% of Si, less than or equal to 0.80% of Mn, 16.00-18.00% of Cr, 1.50-2.50% of Nis, less than or equal to 0.035% of P, less than or equal to 0.030% of S, and the balance of Fe and inevitable impurity elements.
The invention provides a heat treatment process of a stainless steel screw, which adopts a quenching and tempering process and comprises the following steps:
the first step, the charging process, put the part to be treated on the quenching frock, hang the quenching frock on the stock preparation platform, after setting up the quenching parameter, transfer the quenching frock to the effective heating zone of the box-type resistance furnace automatically with the skip, open the furnace automatically;
step two, a quenching procedure, wherein the quenching temperature is 890-910 ℃, and the heat preservation time is determined according to a heat preservation time formula t = alpha.kappa.H, wherein t is the heat preservation time (unit min), alpha is the heat preservation coefficient (unit min/mm) of the part when the part is heated in a gas medium, kappa is the adjustment coefficient of the part charging mode, and H is the effective thickness (unit mm) of the part; and after quenching and heat preservation are finished, quenching and cooling the parts.
Thirdly, a quenching and cooling process, wherein F2000 water-based liquid is adopted to cool the quenched part;
step four, tempering and tempering cooling processes, wherein the tempering process is carried out on the part in time after quenching treatment, and the tempering temperature of the part is determined by the hardness and the mechanical property of the part; and after tempering and heating, tempering and cooling the part.
The invention greatly reduces the quenching and tempering temperature by improving the heat treatment process parameters such as quenching temperature, tempering temperature, quenching medium and the like, changes the original oil medium quenching into F2000 water-based liquid quenching, strictly controls the use temperature of the water-based liquid, and quickly immerses the austenitized workpiece into the water-based liquid for cooling so as to obtain the heat treatment process method for martensite transformation. The invention improves the mechanical property index of 1Cr17Ni2 material products, greatly improves the one-time qualification rate, the qualification rate reaches more than 98 percent, greatly reduces the electricity consumption cost due to greatly reducing the quenching and tempering temperature, solves the problem that the original heat-treated parts can not be produced because the surface cracks directly, and the property index meets the requirement of design drawings after the process is improved. The water-based liquid is used for cooling, so that the environmental pollution is avoided, and the medium consumption cost is reduced.
The invention further adopts the following technical scheme:
in the first step, a gap of 5-10 mm is reserved between two adjacent parts during furnace charging, the parts are placed on a quenching tool, then the quenching tool is hung on a material preparation platform, and the quenching tool is automatically transferred to a uniform temperature area of a box-type resistance furnace by a material trolley.
In the second step, a primary heat preservation process or two heat preservation processes are carried out in the middle of temperature rise, wherein the temperature of the primary heat preservation process is 650 ℃, and the temperatures of the two heat preservation processes are 400-450 ℃ and 650 ℃.
In the second step, the low heating speed is utilized, and when the temperature is in a low-temperature stage of 30 ℃/h to a high-temperature stage of more than 600 ℃ of 100 ℃/h, intermediate heat preservation is not carried out.
In the second step, the heat preservation coefficient of the part when heated in a gas medium is 1.5-2.0, the lower limit (namely 1.5) is taken when the diameter of the part is small, and the upper limit (namely 2.0) is taken when the diameter of the part is large; the charging mode is a chamber furnace charging part mode.
In the third step, the quenching and cooling process is carried out after the quenching, heating and heat preservation are finished, the cooling medium is F2000 water-based liquid, the workpiece is inserted into the F2000 liquid tank liquid for cooling by a skip car during quenching, and the stirrer is opened at the same time; the workpiece is proposed before being cooled to the liquid temperature so as to further reduce quenching stress and prevent cracking.
In the third step, the use temperature of the F2000 water-based liquid is less than 60 ℃, the concentration is controlled to be 9-12%, and the PH value is controlled to be 7-9.
In the fourth step, the tempering temperature is generally determined according to the hardness or mechanical properties of the part, the tensile strength Rm of the common screw part is more than or equal to 780MPa, the yield strength Rp0.2 is more than or equal to 590MPa, the elongation A is more than or equal to 15%, the impact energy Aku is more than or equal to 39J, and the tempering temperature is 640-660 ℃ when the hardness HB is more than or equal to 229 ℃; the tempering heating time is in the same heating medium, generally not less than 1.5 times of the quenching heating time, and the specific tempering heat preservation time is determined according to the actual production conditions (factors such as charging mode, charging amount and the like).
And in the fourth step, after tempering, heating and heat preservation are finished, a tempering and cooling process is carried out, wherein the tempering and cooling medium is F2000 water-based liquid. The invention develops a new heat treatment process for a 1Cr17Ni2 material, which uses F2000 liquid as a cooling medium, improves various parameter indexes of the heat treatment of the 1Cr17Ni2 material, controls a cooling method of water-based liquid, and improves the comprehensive mechanical property of the 1Cr17Ni2 material so as to meet the requirements of design drawings and production.
The invention adopts F2000 water-based liquid as a cooling medium, does not produce smoke pollution during quenching and tempering, avoids fire hazard and can ensure the safety of personnel and equipment. And the steam film stage of the F2000 quenching liquid is very short, so that different parts on the workpiece can almost and simultaneously enter the boiling cooling process, and a higher quenching cooling speed is formed, and in the low-temperature stage (namely, the convection cooling stage) of the cooling process, the cooling is very mild, the martensite transformation structure stress is reduced, and the quenching deformation and cracking danger of the workpiece are greatly reduced.
The invention changes the original oil medium quenching into water-based liquid quenching, and quickly immerses the austenitized workpiece into the water-based liquid for cooling so as to obtain the heat treatment process method for martensitic transformation. Therefore, the mechanical property index of screw products is improved, the product percent of pass is also improved, the rework cost is reduced, the production problem is solved, the performance index meets the requirements of design drawings, and meanwhile, the water-based liquid cooling is adopted, so that the environmental pollution is avoided, and the medium consumption cost is reduced. Through production practices, the mechanical property qualification rate of screw parts quenched by using F2000 liquid is more than or equal to 99%, and the data shows that the invention can effectively improve the qualification rate of products.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a graph showing the relationship between heating temperature and time in the heat treatment process of the present invention.
Detailed Description
Example one
A stainless steel screw is 1Cr17Ni2 material, which comprises the following components by mass percent: 0.11-0.17% of C, less than or equal to 0.80% of Si, less than or equal to 0.80% of Mn, 16.00-18.00% of Cr, 1.50-2.50% of Nis, less than or equal to 0.035% of P, less than or equal to 0.030% of S, and the balance of Fe and inevitable impurity elements.
A heat treatment process of a stainless steel screw adopts a quenching and tempering process, and comprises the following steps:
the first step, the charging process: placing the parts to be processed on a quenching tool (a quenching workpiece is a hanging frame), hanging the quenching tool on a material preparation platform, and automatically transferring the quenching tool to an effective heating area of a box-type resistance furnace by using a material trolley, wherein the execution standard of the effective heating area measuring method is as follows: GB/T9452, the automatic operation program is automatically operated after the parameters are set in the foreground, and the furnace is automatically opened.
Step two, quenching process: quenching treatment is started, and in the quenching operation, the quenching temperature is 890-910 ℃; heating the 1Cr17Ni2 parts to the quenching temperature along with the furnace, preserving the heat for a certain time according to the requirement, automatically discharging the parts from the furnace by a skip car after the heat preservation is finished, and automatically transferring the parts to an F2000 quenching medium for quenching and cooling.
Because the heat treatment quality of the part is determined by the time of the part staying in the heat preservation stage, the heating time is related to the components, the shape and the size of the workpiece, the heating speed, the heating medium, the heating mode, the charging amount and other factors, the heat preservation time is determined according to the quenching heat preservation time formula t = alpha · κ · H, wherein t: incubation time (min), α: the heat retention coefficient (min/mm) of the steel when heated in a gaseous medium is shown in Table 1; kappa: the adjustment coefficient of the part charging is shown in table 2; h: part effective thickness (mm), see table 3.
TABLE 1 thermal insulation coefficient α of steel heated in gaseous medium
TABLE 2 adjustment factor for charging parts
TABLE 3 part effective thickness H calculation
 |
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| H=D | H=h |
Step three, quenching and cooling: and cooling the quenched part by using F2000 water-based liquid.
Step four, tempering and tempering cooling: the part is subjected to a tempering process in time after quenching treatment, the tempering temperature is determined according to factors such as design mechanical property requirements (such as hardness, strength, plasticity, toughness and the like) of the workpiece, and the tempering temperature of the part is determined by the hardness and the mechanical property of the part; and after the tempering heating is finished, tempering and cooling the part.
In the first step, a gap of 5-10 mm is reserved between two adjacent parts during furnace charging, the parts are placed on a quenching tool, then the quenching tool is hung on a material preparation platform, and the quenching tool is automatically transferred to a uniform temperature area of a box-type resistance furnace by a material trolley. The equipment grade of the box type resistance furnace is V grade, and the control precision is +/-10 ℃.
In the second step, in the quenching operation, in order to avoid deformation and cracking caused by excessive thermal stress in the heating process, a process method of controlling temperature rise, namely step temperature rise, is often adopted: performing a primary heat preservation process or two heat preservation processes in the midway of temperature rise, wherein the temperature of the primary heat preservation process is 650 ℃, and the temperatures of the two heat preservation processes are 400-450 ℃ and 650 ℃; or the low heating speed can be utilized, and when the temperature is in a low-temperature stage of 30 ℃/h to a high-temperature stage of more than 600 ℃ of 100 ℃/h, the intermediate heat preservation is not carried out. The heat preservation coefficient of the part when heated in a gas medium is 1.5-2.0, the lower limit (namely 1.5) is taken when the diameter of the part is small, and the upper limit (namely 2.0) is taken when the diameter of the part is large; the charging mode is a chamber furnace charging part mode.
Step three, after quenching, heating and heat preservation are completed, the quenching and cooling process is carried out, wherein the cooling medium is F2000 water-based liquid, and during quenching, a workpiece is inserted into the F2000 liquid tank liquid by a skip car for cooling, and meanwhile, a stirrer is opened; the workpiece is proposed before being cooled to the liquid temperature so as to further reduce quenching stress and prevent cracking. The use temperature of the F2000 water-based liquid is less than 60 ℃, the concentration is controlled to be 9-12%, and the PH value is controlled to be 7-9.
In the fourth step, the tempering temperature is generally determined according to the hardness or mechanical properties of the part, the tensile strength Rm of the common screw part is more than or equal to 780MPa, the yield strength Rp0.2 is more than or equal to 590MPa, the elongation A is more than or equal to 15%, the impact energy Aku is more than or equal to 39J, and the tempering temperature is 640-660 ℃ when the hardness HB is more than or equal to 229 ℃; the tempering heating time is in the same heating medium, generally not less than 1.5 times of the quenching heating time, and the specific tempering heat preservation time is determined according to the actual production conditions (factors such as charging mode, charging amount and the like). And (3) entering a tempering and cooling process after tempering, wherein the 1Cr17Ni2 material has the second type of tempering brittleness, so that the material is quickly cooled after tempering and heat preservation, and the tempering and cooling medium is F2000 water-based liquid.
Example 2
In this embodiment, three blank screw test bars with diameter of 38 mm × 200mm, diameter of 55 mm × 200mm, and diameter of 85mm × 200mm are used as examples, and a process test is performed with F2000 water-based liquid as a cooling medium (during quenching and tempering).
In this embodiment, a continuous tuning box type (nitrogen protection) resistance furnace is also adopted, the equipment grade is V grade, and the temperature control precision is ± 1 ℃. And charging is carried out in the same manner as described above.
The heating temperature of the heat treatment quenching is as follows: 900 +/-10 ℃, and the time from the furnace temperature rising mode to the quenching heat preservation is respectively as follows: the quenching medium for heat treatment of 75 min, 100 min and 150 min is F2000 water-based liquid, the temperature of the water-based liquid before quenching is 30 ℃, the concentration is 11 percent, and the pH value is 7.8. In order to prevent cracking, the temperature of the discharged liquid needs to be controlled, namely, the workpiece is discharged and air-cooled after quenching and cooling for 2-3 minutes.
Tempering temperature and time: the tempering temperature is 650 +/-10 ℃, and the heat preservation time is 150 minutes and 180 minutes and 240 minutes respectively; after tempering, heating and heat preservation are finished, F2000 water-based liquid is used as a cooling medium, and the control requirement of the F2000 water-based liquid is the same as that of the quenching stage.
And (3) after the above steps are finished, carrying out a hardness test: the surface of the heat-treated part was polished and subjected to hardness test on a TIME5106 portable hardness machine, and the results are shown in tables 1-2.
And (3) tensile test: the parts after heat treatment are sampled (line cut) according to the standard specified positions, processed into standard samples, and subjected to tensile test on a WAW-600D type microcomputer control electro-hydraulic servo universal testing machine at room temperature, and the results are shown in tables 1-2.
And (3) impact test: sampling (linear cutting) the parts after heat treatment according to standard specified positions, processing into standard impact test samples, wherein three impact test blocks are all U-shaped notches, carrying out normal-temperature impact test on a JB-W300 type digital display pendulum hammer type impact tester, and measuring the impact toughness value, wherein the results are shown in Table 4.
TABLE 4 test results
| Diameter of parts (mm) | Hardness HB | Rm(Mpa) | Rp0.2(Mpa ) | A（%） | Z（%） | Aku(J)（20℃） |
| φ38 | 239 | 831 | 703 | 19 | 60 | 112 118 115 |
| φ55 | 245 | 850 | 734 | 17 | 60 | 120 120 114 |
| φ85 | 250 | 853 | 760 | 18.5 | 59 | 108 111 112 |
The invention has the following advantages:
1. the quenching and tempering temperature is obviously lower than that of the conventional heat treatment, and the energy consumption is greatly reduced; 2. the F2000 water-based liquid has low use cost, and can be used only by adding the F2000 into tap water and mutually dissolving the F2000 with the water to meet the proportioning requirement; 3. the method is pollution-free and safe, and realizes clean production; 4. the comprehensive mechanical property is good, the technical requirements of design drawings are met, and the qualification rate reaches more than 99%.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (10)
1. A1 Cr17Ni2 stainless steel screw rod is characterized in that the stainless steel screw rod comprises the following components in percentage by mass: 0.11-0.17% of C, less than or equal to 0.80% of Si, less than or equal to 0.80% of Mn, 16.00-18.00% of Cr, 1.50-2.50% of Nis, less than or equal to 0.035% of P, less than or equal to 0.030% of S, and the balance of Fe and inevitable impurity elements.
2. The heat treatment process of the 1Cr17Ni2 stainless steel screw rod of claim 1, comprising the following steps:
the first step, the charging process, put the part to be treated on the quenching frock, hang the quenching frock on the stock preparation platform, after setting up the quenching parameter, transfer the quenching frock to the effective heating zone of the box-type resistance furnace automatically with the skip, open the furnace automatically;
step two, quenching, wherein the quenching temperature is 890-910 ℃, and the heat preservation time is determined according to a heat preservation time formula t = alpha · k · H, wherein t is the heat preservation time, alpha is the heat preservation coefficient of the part when being heated in a gas medium, kappa is the adjustment coefficient of the part charging mode, and H is the effective thickness of the part;
thirdly, a quenching and cooling process, wherein F2000 water-based liquid is adopted to cool the quenched part;
step four, tempering and tempering cooling processes, wherein the tempering process is carried out on the part in time after quenching treatment, and the tempering temperature of the part is determined by the hardness and the mechanical property of the part; and after tempering and heating, tempering and cooling the part.
3. The heat treatment process of the 1Cr17Ni2 stainless steel screw rod, according to claim 2, characterized in that in the first step, a gap of 5-10 mm is left between two adjacent parts during furnace loading, the part is placed on a quenching tool, then the quenching tool is hung on a material preparation platform, and the quenching tool is automatically transported to a uniform temperature area of a box-type resistance furnace by a material trolley.
4. The heat treatment process for a 1Cr17Ni2 stainless steel screw according to claim 2, wherein in the second step, a primary heat-insulating step or a secondary heat-insulating step is performed during the temperature rise, the temperature in the primary heat-insulating step is 650 ℃, and the temperatures in the secondary heat-insulating step are 400 to 450 ℃ and 650 ℃ respectively.
5. The heat treatment process of the 1Cr17Ni2 stainless steel screw according to claim 2, wherein in the second step, the intermediate heat preservation is not performed at a low temperature stage of 30 ℃/h to a high temperature stage of 600 ℃ or higher of 100 ℃/h with a low heating rate.
6. The heat treatment process of the 1Cr17Ni2 stainless steel screw rod according to claim 2, wherein in the second step, the heat preservation coefficient of the part when heated in the gas medium is 1.5-2.0, the lower limit is taken when the diameter of the part is small, and the upper limit is taken when the diameter of the part is large; the charging mode is a chamber furnace charging part mode.
7. The heat treatment process of the 1Cr17Ni2 stainless steel screw rod according to claim 2, wherein in the third step, the quenching cooling process is performed after the quenching heating and heat preservation are completed, the cooling medium is F2000 water-based liquid, the workpiece is inserted into the F2000 liquid tank liquid for cooling by a skip during quenching, and the stirrer is opened; the workpiece is proposed before being cooled to the liquid temperature so as to further reduce quenching stress and prevent cracking.
8. The heat treatment process of the 1Cr17Ni2 stainless steel screw rod according to claim 7, wherein in the third step, the use temperature of the F2000 water-based fluid is less than 60 ℃, the concentration is controlled to be 9-12%, and the pH value is controlled to be 7-9.
9. The heat treatment process of the 1Cr17Ni2 stainless steel screw rod of claim 2, wherein in the fourth step, the tempering temperature is generally determined according to the hardness or mechanical property of the part, the tensile strength Rm of the common screw rod part is greater than or equal to 780MPa, the yield strength Rp0.2 is greater than or equal to 590MPa, the elongation A is greater than or equal to 15%, the impact power Aku is greater than or equal to 39J, and the tempering temperature is 640-660 ℃ when the hardness HB is greater than or equal to 229 ℃; the tempering heating time is equal to that of the same heating medium, and is generally not less than 1.5 times of the quenching heating time.
10. The heat treatment process of the 1Cr17Ni2 stainless steel screw rod according to claim 2, wherein in the fourth step, the tempering cooling process is performed after the tempering heating and heat preservation are completed, and the tempering cooling medium is F2000 water-based liquid.
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| CN113444861A (en) * | 2021-07-01 | 2021-09-28 | 沈阳航天新光集团有限公司 | One-time tempering heat treatment processing technology suitable for 1Cr17Ni2 stainless steel |
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