CN112430712A - Heat treatment process for high-speed steel threaded element - Google Patents
Heat treatment process for high-speed steel threaded element Download PDFInfo
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- CN112430712A CN112430712A CN202011328823.9A CN202011328823A CN112430712A CN 112430712 A CN112430712 A CN 112430712A CN 202011328823 A CN202011328823 A CN 202011328823A CN 112430712 A CN112430712 A CN 112430712A
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- minutes
- temperature
- threaded element
- heat treatment
- speed steel
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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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
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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
- C21D6/04—Hardening by cooling below 0 degrees Celsius
-
- 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
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
- C23C8/42—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions only one element being applied
- C23C8/48—Nitriding
- C23C8/50—Nitriding of ferrous surfaces
Abstract
The invention provides a heat treatment process for a high-speed steel threaded element, and particularly relates to the field of screw extruder elements, wherein S1, vacuum quenching: intermediate temperature vacuum quenching is adopted at 1050-1250 ℃ for 80-100 minutes; s2, tempering: the quenching stress is eliminated at the temperature of 400-600 ℃, the time is 120-170 minutes, and the tempering is carried out for three times; s3, cryogenic treatment: deep cooling at 120-140 deg.c for 460-500 min to reduce residual austenite. S4, QPQ treatment, namely nitriding the liquid salt bath to improve the surface hardness to be more than HV1200, wherein the process temperature is 520-560 ℃ and the time is 140-160 minutes; and oxidizing the liquid salt bath at the industrial temperature of about 400-440 ℃ for 20-30 minutes to obtain the target product. The invention can obviously prolong the service life of the device and reduce the consumption of raw materials.
Description
Technical Field
The invention belongs to a heat treatment process of a high-speed steel threaded element, and particularly relates to the field of screw extruder elements.
Background
The screw extruder depends on the pressure and the shearing force generated by the rotation of the screw, so that materials can be fully plasticized and uniformly mixed and are molded through a neck mold. Plastic extruders can be basically classified into twin-screw extruders, single-screw extruders and, rarely, multi-screw extruders and screw-less extruders; the screw elements are important components of the screw extruder, which directly influence the screw extruder life. The heat treatment mode commonly used in the prior industry of the threaded element is vacuum quenching, the hardness range is HRC 60-62 degrees, the brittleness is large, and the surface is not rustproof and has poor corrosion resistance.
Disclosure of Invention
The invention aims to provide a heat treatment process for a high-speed steel threaded element, which can obviously prolong the service life of a device and reduce the consumption of raw materials.
The invention provides the following technical scheme:
a heat treatment process for a high-speed steel threaded element comprises the following steps,
s1, vacuum quenching: intermediate temperature vacuum quenching is adopted at 1050-1250 ℃ for 80-100 minutes;
s2, tempering: the quenching stress is eliminated at 400-600 ℃ for 120-170 minutes, and the tempering is carried out for three times
S3, cryogenic treatment: deep cooling at 120-140 deg.c for 460-500 min to reduce residual austenite.
S4, QPQ treatment, namely nitriding the liquid salt bath to improve the surface hardness to be more than HV1200, wherein the process temperature is 520-560 ℃ and the time is 140-160 minutes; oxidizing the liquid salt bath at an industrial temperature of about 400-440 ℃ for 20-30 minutes to obtain a target product;
preferably, in the step S1, the vacuum quenching is specifically performed by medium-temperature vacuum quenching at about 1150 ℃ for 90 minutes;
preferably, in the step S2, tempering is performed three times at a quenching stress relief temperature of 500 degrees celsius for 150 minutes.
Preferably, in the step S3, the cryogenic treatment is specifically performed as follows, namely, cryogenic treatment is performed at a temperature of-130 ℃ for 480 minutes to reduce residual austenite.
Preferably, in the step S4, the QPQ treatment is specifically performed by, first, nitriding the liquid salt bath to increase the hardness of the surface to HV1200, at a process temperature of 540 ℃, for 150 minutes; then oxidizing the liquid salt bath at an industrial temperature of about 420 ℃ for 25 minutes to obtain the target product
The invention has the beneficial effects that:
the hardness of the matrix of the threaded element is adjusted to HRC 58-60, so that the brittleness and the toughness are reduced, the risk of cracking of the threaded element due to large brittleness is reduced, the surface hardness is improved to be more than HV1250, and the surface is more wear-resistant. Because nitrogen and oxygen atoms are permeated into the surface, a layer of protective film is formed on the surface of the threaded element, and the corrosion resistance of the workpiece is improved. The threaded element adopting the composite process for heat treatment can obviously prolong the service life and reduce the consumption of raw materials.
Detailed Description
Example 1:
a heat treatment process for a high-speed steel threaded element comprises the following steps,
vacuum quenching: adopts medium temperature vacuum quenching at 1050 ℃ for 80 minutes, and takes deformation and hardness into consideration
Tempering: the quenching stress is eliminated at 400 ℃, the time is 120 minutes, and the tempering is carried out for three times
Cryogenic treatment: deep cooling at 120 ℃ below zero, reducing residual austenite within 460 minutes, refining grains, and improving hardness and toughness.
QPQ first step: liquid salt bath nitriding to raise the surface hardness to HV1200, at the technological temperature of 520-140 deg.c for 140 min
The second step is that: oxidizing the liquid salt bath to improve the corrosion resistance, wherein the industrial temperature is about 400-440 ℃, and the time is 20-30 minutes, so that a target product is obtained;
example 2
A heat treatment process for a high-speed steel threaded element comprises the following specific steps:
vacuum quenching: adopts medium temperature vacuum quenching at 1150 ℃ for about 90 minutes and takes deformation and hardness into consideration
Tempering: the quenching stress is eliminated at 500 ℃ for three times of tempering within 150 minutes
Cryogenic treatment: deep cooling at the temperature of minus 130 ℃, reducing residual austenite in 480 minutes, refining grains, and improving the hardness and toughness.
QPQ first step: liquid salt bath nitriding to raise the surface hardness to HV1200, process temperature 540 deg.c and time of 150 min
The second step is that: the liquid salt bath is oxidized to improve the corrosion resistance, and the industrial temperature is 420 ℃. The time is 25 minutes; thus obtaining the target product;
example 3
A heat treatment process for a high-speed steel threaded element comprises the following steps,
vacuum quenching: adopts medium temperature vacuum quenching at 1250 ℃ for 100 minutes, and takes deformation and hardness into consideration
Tempering: the quenching stress is eliminated at 600 ℃, the time is 170 minutes, and the tempering is carried out for three times
Cryogenic treatment: deep cooling at 140 ℃ below zero for 500 minutes to reduce residual austenite, refine grains and improve hardness and toughness.
QPQ first step: liquid salt bath nitriding to improve the surface hardness to HV1200, the process temperature is 560 ℃, and the time is 160 minutes
The second step is that: oxidizing the liquid salt bath to improve the corrosion resistance, wherein the industrial temperature is about 440 ℃, and the time is 30 minutes to obtain a target product;
the strength and salt spray tests were carried out on examples 1 to 3 and on the common products on the market, as follows:
and (3) testing the strength:
example 1: the tensile strength is 331Mpa, the yield strength is 362Mpa
Example 2: tensile strength of 356MPa, yield strength of 390MPa
Example 3: tensile strength of 325MPa and yield strength of 340MPa
Commercial products: the tensile strength is 291MPa, the yield strength is 312MPa
And (3) testing salt spray corrosion resistance:
the solution was sprayed with 5% aqueous sodium chloride solution adjusted to a pH in the neutral range of 6.5. The test temperature is 35 ℃, the sedimentation rate of the salt spray is required to be between 3ml/80cm2.h, and the sedimentation amount is required to be 2ml/80cm2. h;
the percentage of the area of corrosion to the total area is ranked, the better the corrosion resistance the top ranking is
The test results were as follows: example 3> example 1> example 2> commercial product
Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A heat treatment process for a high-speed steel threaded element is characterized by comprising the following steps: through the following steps of the method, the method comprises the following steps,
s1, vacuum quenching: intermediate temperature vacuum quenching is adopted at 1050-1250 ℃ for 80-100 minutes;
s2, tempering: the quenching stress is eliminated at the temperature of 400-600 ℃, the time is 120-170 minutes, and the tempering is carried out for three times;
s3, cryogenic treatment: deep cooling at 120-140 ℃ below zero for 460-500 minutes to reduce residual austenite;
s4, QPQ treatment, namely nitriding the liquid salt bath to improve the surface hardness to be more than HV1200, wherein the process temperature is 520-560 ℃ and the time is 140-160 minutes; and oxidizing the liquid salt bath at the industrial temperature of about 400-440 ℃ for 20-30 minutes to obtain the target product.
2. A high speed steel threaded element heat treatment process according to claim 1, characterized in that: in the step S1, vacuum quenching is specifically performed as follows, and medium-temperature vacuum quenching is performed at about 1150 ℃ for 90 minutes.
3. A high speed steel threaded element heat treatment process according to claim 1, characterized in that: in the step S2, tempering is specifically performed at a quenching stress relief temperature of 500 ℃ for 150 minutes for three times.
4. A high speed steel threaded element heat treatment process according to claim 1, characterized in that: in the step S3, the subzero 130 ℃ deep cooling treatment is specifically performed, and the residual austenite is reduced within 480 minutes.
5. A high speed steel threaded element heat treatment process according to claim 1, characterized in that: in the step S4, the QPQ treatment is specifically performed by, first, nitriding a liquid salt bath to increase the hardness of the surface to HV1200, at a process temperature of 540 ℃, for 150 minutes; then the liquid salt bath is oxidized, the industrial temperature is about 420 ℃, and the time is 25 minutes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011328823.9A CN112430712A (en) | 2020-11-24 | 2020-11-24 | Heat treatment process for high-speed steel threaded element |
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| CN202011328823.9A CN112430712A (en) | 2020-11-24 | 2020-11-24 | Heat treatment process for high-speed steel threaded element |
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Citations (10)
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|---|---|---|---|---|
| CN1117122A (en) * | 1994-12-31 | 1996-02-21 | 重庆浦陵机器厂 | Machining technology for engine connecting rod of motor cycle |
| CN101660031A (en) * | 2009-09-22 | 2010-03-03 | 大连理工大学 | Periodic sub-zero treatment process of finished high speed steel cutters |
| CN103205668A (en) * | 2013-04-28 | 2013-07-17 | 莱州天润机械有限公司 | Application of QPQ (Quench-Polish-Quench) salt bath composite treatment process in handle rods at two ends of die stock and cutter bar frame |
| CN108359785A (en) * | 2018-03-19 | 2018-08-03 | 盐城工学院 | A kind of strengthening and toughening treatment method of W6Mo5Cr4V2 high-speed steel broaches |
| CN109268393A (en) * | 2018-11-05 | 2019-01-25 | 合肥波林复合材料有限公司 | A kind of high-mechanic self lubrication bearing and preparation method thereof |
| CN109295288A (en) * | 2018-10-15 | 2019-02-01 | 东莞理工学院 | A kind of metal works hydrodynamics technique |
| CN109402351A (en) * | 2018-10-15 | 2019-03-01 | 东莞理工学院 | A kind of metal works processing method |
| CN110172549A (en) * | 2019-06-28 | 2019-08-27 | 金川集团股份有限公司 | A kind of processing method of self-lubricating phosphorous copper balls extrusion die |
| CN110314954A (en) * | 2019-07-29 | 2019-10-11 | 中国兵器工业第五九研究所 | A kind of preparation method of high viscosity metal cold-extrusion shaping mold |
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-
2020
- 2020-11-24 CN CN202011328823.9A patent/CN112430712A/en active Pending
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| CN1117122A (en) * | 1994-12-31 | 1996-02-21 | 重庆浦陵机器厂 | Machining technology for engine connecting rod of motor cycle |
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Application publication date: 20210302 |