CN111270197A - Heat treatment process for rock drilling rod - Google Patents
Heat treatment process for rock drilling rod Download PDFInfo
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- CN111270197A CN111270197A CN202010135214.5A CN202010135214A CN111270197A CN 111270197 A CN111270197 A CN 111270197A CN 202010135214 A CN202010135214 A CN 202010135214A CN 111270197 A CN111270197 A CN 111270197A
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- rock drilling
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- drilling rod
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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
- C23C8/06—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 gases
- C23C8/08—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 gases only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
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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
- C21D1/74—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
- C21D11/00—Process control or regulation for heat treatments
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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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
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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
Abstract
The invention discloses a heat treatment process of a rock drilling rod, which comprises the steps of integral carburization, integral quenching, integral high-temperature tempering, integral low-temperature tempering and shot blasting treatment; by adopting the technical scheme of the invention, in the process of carrying out heat treatment on the rock drilling rod, the temperature of various heating devices is measured by the temperature measuring gun and the induction thermocouple, the heating speed and the cooling speed of the rock drilling rod are strictly controlled, the temperature difference between the surface layer and the core part of the rock drilling rod is reduced, the thermal stress generated inside a workpiece is reduced as much as possible, and the residual stress inside the rock drilling rod is further and thoroughly released by shot blasting after the whole carburizing, the whole quenching, the whole high-temperature tempering and the whole low-temperature tempering treatment, so that the fatigue strength of the rock drilling rod is improved, and the service life of the rock drilling rod is prolonged; in addition, the whole carburization, the whole quenching, the whole high-temperature tempering and the whole low-temperature tempering are all carried out in a vacuum furnace, so that the surface of the rock drilling rod can be prevented from being oxidized, and the quality of a heat treatment process is effectively improved.
Description
Technical Field
The invention belongs to the technical field of drill tool heat treatment, and particularly relates to a heat treatment process for a rock drilling drill rod.
Background
The rock drilling rod bears the action of the cyclic stress of tension, compression, bending and torsion applied by a high-frequency and high-impact-power rock drill in the drilling process and bears huge impact load. In addition, the drill rod is also subjected to the corrosion and abrasion action of working media such as rocks, rock powder, mineral water and the like under the environment conditions of high-speed rotation and collision, so that the service condition of the drill rod is quite severe, the service life of the drill rod produced in China at present is short, and the drill rod fails even if being used for hundreds of meters, so that the working environment of the drill rod is complex and the quality requirement is high. The quality of a rock drilling rod in the heat treatment process directly influences the quality of the rock drilling rod, and the rock drilling rod has a very critical effect on the using effect of the rock drilling rod.
Disclosure of Invention
In order to solve the technical problem, the invention provides a heat treatment process for a rock drilling rod.
The invention is realized by the following technical scheme.
The invention provides a heat treatment process of a rock drilling rod, which comprises the following steps:
the method comprises the following steps: integral carburizing: putting a rock drilling rod into a vacuum furnace for heating, measuring the temperature in the vacuum furnace by using a temperature measuring gun and an induction thermocouple, enabling the temperature in the vacuum furnace to rise at a speed of less than 3 ℃/s, transferring the rock drilling rod into a carburizing furnace when the rock drilling rod is heated to 850 ℃, simultaneously filling protective gas into the carburizing furnace, adding a carburizing agent, heating the rock drilling rod in the carburizing furnace, measuring the temperature in the vacuum furnace by using the temperature measuring gun and the induction thermocouple, enabling the temperature rise speed in the carburizing furnace to be less than 3 ℃/s, controlling the carbon potential, entering a strong cementation stage when the temperature in the carburizing furnace rises to 900 ℃ and the carbon potential is 1.2%, keeping the temperature of the rock drilling rod for 3-5h, then entering a diffusion stage when the carbon potential is controlled to be 0.8%, keeping the temperature of the rock drilling rod for 2-3h, then reducing the temperature in the carburizing furnace to 850 ℃ at a speed of less than 3 ℃/s, then the rock drilling rod is taken out of the carburizing furnace after heat preservation is carried out for 1h, and the rock drilling rod is naturally cooled to be below 20 ℃;
step two: integral quenching: placing the rock drilling drill rod processed in the first step into a vacuum furnace for heating, measuring the temperature in the vacuum furnace by using a temperature measuring gun and an induction thermocouple, raising the temperature in the vacuum furnace to over 1100 ℃ at a speed of less than 3 ℃/s, then preserving the temperature for 1.5-2 h, then carrying out vacuum oil quenching on the rock drilling drill rod, and taking out the rock drilling drill rod from the vacuum furnace to naturally cool the rock drilling drill rod to below 20 ℃;
step three: integral high-temperature tempering: placing the rock drilling drill rod processed in the second step into a vacuum furnace for heating, measuring the temperature in the vacuum furnace by using a temperature measuring gun and an induction thermocouple, raising the temperature in the vacuum furnace to 450-600 ℃ at a speed of less than 3 ℃/s, then preserving the temperature for 2.5-3.5 h, taking out the rock drilling drill rod when the temperature in the vacuum furnace is reduced to 450 ℃ at a speed of less than 3 ℃/s, and naturally cooling the rock drilling drill rod to be below 20 ℃;
step four: and (3) integral low-temperature tempering: putting the rock drilling drill rod processed in the fourth step into a vacuum furnace for heating, measuring the temperature in the vacuum furnace by using a temperature measuring gun and an induction thermocouple, raising the temperature in the vacuum furnace to 220 ℃ at a speed of less than 3 ℃/s, preserving the temperature for 2h, and then taking out the rock drilling drill rod and naturally cooling the rock drilling drill rod to below 20 ℃;
step five: shot blasting: shot blasting is carried out on the rock drilling rod processed in the fourth step, the shot is cast steel shot, the diameter of the shot is 0.5-1.0mm, and the density is 5500kg/m3Velocity of jetThe spraying angle is 30-75 degrees at 250m/s and 150-.
In the first step, the protective gas is nitrogen.
In the first step, the carburizing agent is butane.
In the step one, the carbon potential is controlled by using an infrared ray or an oxygen probe.
The heat treatment process for the rock drilling rod further comprises the following steps:
and before the first step, cleaning the surface of the rock drill rod, removing oil stain and then airing.
The heat treatment process for the rock drilling rod further comprises the following steps:
step 1: in the process of the first step, when the rock drilling rod enters a strong cementation stage, protective gas is filled into a carburizing furnace, so that the internal pressure of the carburizing furnace reaches and is maintained within the range of 1000-2000 Pa;
step 2: in the process of the first step, when the rock drilling rod enters a diffusion stage, extracting a proper amount of protective gas in a carburizing furnace, and reducing the internal pressure of the carburizing furnace to be maintained at 50-500 Pa.
And in the second step, the quenching medium adopted for carrying out vacuum oil quenching on the rock drilling drill rod is vacuum quenching oil.
The heat treatment process for the rock drilling rod further comprises the following steps:
and repeating the first step to the third step at least twice after the third step is finished and before the fourth step is carried out.
The rock drilling drill rod is H22, H25, H28, H32 or H35.
The invention has the beneficial effects that: by adopting the technical scheme of the invention, in the process of carrying out heat treatment on the rock drilling rod, the temperature of various heating devices is measured by the temperature measuring gun and the induction thermocouple, so that the heating speed and the cooling speed of the rock drilling rod are strictly controlled, the temperature difference between the surface layer and the core part of the rock drilling rod is reduced, the thermal stress generated inside a workpiece is reduced as much as possible, and the residual stress inside the rock drilling rod is further and thoroughly released by shot blasting after the whole carburizing, the whole quenching, the whole high-temperature tempering and the whole low-temperature tempering treatment, so that the fatigue strength of the rock drilling rod is improved, and the service life of the rock drilling rod is prolonged; in addition, in the process of carrying out overall carburization, overall quenching, overall high-temperature tempering and overall low-temperature tempering treatment on the rock drilling rod, the rock drilling rod is always heated in a vacuum furnace, active substances in the air are prevented from influencing the heat treatment process of the rock drilling rod, protective gas is added in the carburization process, the internal oxidation of the rock drilling rod is prevented, the heat treatment process quality of the rock drilling rod can be effectively improved, in addition, butane is used as a carburizing agent, the safety is higher, the thickness of a carburized layer can be obviously improved, the thickness of a carburized layer tissue formed on the surface of the prepared rock drilling rod can reach 1.2-1.6mm, the carbon content of a surface layer reaches 0.77-0.83%, the surface hardness reaches 54-58HRC, the part hardness reaches 38-45HRC, the fatigue life, the wear resistance, the surface hardness and the like of the rock drilling rod are obviously improved, The core hardness and other key technical indexes obviously improve the metallographic structure of the rock drilling rod, obviously improve the product quality, prolong the average single rock drilling footage life of the rock drilling rod from 300 m-800 m to 1500 m-2500 m, and obviously prolong the service life of the rock drilling rod.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
As shown in fig. 1, the heat treatment process of the rock drill rod of the invention comprises the following steps:
the method comprises the following steps: integral carburizing: putting a rock drilling rod into a vacuum furnace for heating, measuring the temperature in the vacuum furnace by using a temperature measuring gun and an induction thermocouple, enabling the temperature in the vacuum furnace to rise at a speed of less than 3 ℃/s, transferring the rock drilling rod into a carburizing furnace when the rock drilling rod is heated to 850 ℃, simultaneously filling protective gas into the carburizing furnace, adding a carburizing agent, heating the rock drilling rod in the carburizing furnace, measuring the temperature in the vacuum furnace by using the temperature measuring gun and the induction thermocouple, enabling the temperature rise speed in the carburizing furnace to be less than 3 ℃/s, controlling the carbon potential, entering a strong cementation stage when the temperature in the carburizing furnace rises to 900 ℃ and the carbon potential is 1.2%, keeping the temperature of the rock drilling rod for 3-5h, then entering a diffusion stage when the carbon potential is controlled to be 0.8%, keeping the temperature of the rock drilling rod for 2-3h, then reducing the temperature in the carburizing furnace to 850 ℃ at a speed of less than 3 ℃/s, then the rock drilling rod is taken out of the carburizing furnace after heat preservation for 1h, and is naturally cooled to below 20 ℃; preferably, the protective gas in step one is nitrogen. In the first step, the carburizing agent is butane. The carbon potential control in the first step means that the carbon potential is controlled by an infrared ray or an oxygen probe. Preferably the rock drill rod is a drill rod for drilling H22, H25, H28, H32 or H35.
Step two: integral quenching: placing the rock drilling drill rod processed in the first step into a vacuum furnace for heating, measuring the temperature in the vacuum furnace by using a temperature measuring gun and an induction thermocouple, raising the temperature in the vacuum furnace to over 1100 ℃ at a speed of less than 3 ℃/s, then preserving the temperature for 1.5-2 h, then carrying out vacuum oil quenching on the rock drilling drill rod, and taking out the rock drilling drill rod from the vacuum furnace to naturally cool the rock drilling drill rod to below 20 ℃; further, preferably, the quenching medium used for performing vacuum oil quenching on the rock drilling drill rod in the second step is vacuum quenching oil.
Step three: integral high-temperature tempering: placing the rock drilling drill rod processed in the second step into a vacuum furnace for heating, measuring the temperature in the vacuum furnace by using a temperature measuring gun and an induction thermocouple, raising the temperature in the vacuum furnace to 450-600 ℃ at a speed of less than 3 ℃/s, then preserving the temperature for 2.5-3.5 h, taking out the rock drilling drill rod when the temperature in the vacuum furnace is reduced to 450 ℃ at a speed of less than 3 ℃/s, and naturally cooling the rock drilling drill rod to be below 20 ℃;
step four: and (3) integral low-temperature tempering: putting the rock drilling drill rod processed in the fourth step into a vacuum furnace for heating, measuring the temperature in the vacuum furnace by using a temperature measuring gun and an induction thermocouple, raising the temperature in the vacuum furnace to 220 ℃ at a speed of less than 3 ℃/s, preserving the temperature for 2h, and then taking out the rock drilling drill rod and naturally cooling the rock drilling drill rod to below 20 ℃;
step five: shot blasting: to pass throughShot blasting is carried out on the rock drilling rod processed in the fourth step, the shot is cast steel shot, the diameter of the shot is 0.5-1.0mm, and the density is 5500kg/m3The spraying speed is 150-250m/s, the spraying angle is 30-75 degrees, the residual stress of the surface layer of the rock drilling drill rod is eliminated, the generation of fatigue cracks on the surface layer of the rock drilling drill rod is inhibited, and the process is finished. By adopting the technical scheme of the invention, the rock drilling rod can be prevented from being rapidly heated or rapidly cooled by controlling the heating speed and the cooling speed of heat treatment equipment such as a vacuum furnace, a carburizing furnace and the like, the thermal stress generated in the rock drilling rod is reduced as much as possible, and the residual stress in the rock drilling rod is further and thoroughly released by shot blasting treatment after renting, so that the fatigue strength and the service performance of the rock drilling rod are improved.
In addition, the heat treatment process of the rock drilling rod further comprises the following steps:
and before the first step, cleaning the surface of the rock drill rod, removing oil stain and then airing.
In addition, the heat treatment process of the rock drill rod further comprises the following steps:
step 1: in the process of the first step, when the rock drilling rod enters a strong cementation stage, protective gas is filled into the carburizing furnace, so that the internal pressure of the carburizing furnace reaches and is maintained within the range of 1000-2000 Pa;
step 2: in the process of the first step, when the rock drilling rod enters a diffusion stage, extracting a proper amount of protective gas in the carburizing furnace, and reducing the pressure in the carburizing furnace to be maintained at 50-500 Pa.
In addition, the heat treatment process of the rock drill rod further comprises the following steps:
and repeating the first step to the third step at least twice after the third step is finished and before the fourth step is carried out.
By adopting the technical scheme of the invention, in the process of carrying out heat treatment on the rock drilling rod, the temperature of various heating devices is measured by the temperature measuring gun and the induction thermocouple, so that the heating speed and the cooling speed of the rock drilling rod are strictly controlled, the temperature difference between the surface layer and the core part of the rock drilling rod is reduced, the thermal stress generated inside a workpiece is reduced as much as possible, and the residual stress inside the rock drilling rod is further and thoroughly released by shot blasting after the whole carburizing, the whole quenching, the whole high-temperature tempering and the whole low-temperature tempering treatment, so that the fatigue strength of the rock drilling rod is improved, and the service life of the rock drilling rod is prolonged; in addition, in the process of carrying out overall carburization, overall quenching, overall high-temperature tempering and overall low-temperature tempering treatment on the rock drilling rod, the rock drilling rod is always heated in a vacuum furnace, active substances in the air are prevented from influencing the heat treatment process of the rock drilling rod, protective gas is added in the carburization process, the internal oxidation of the rock drilling rod is prevented, the heat treatment process quality of the rock drilling rod can be effectively improved, in addition, butane is used as a carburizing agent, the safety is higher, the thickness of a carburized layer can be obviously improved, the thickness of a carburized layer tissue formed on the surface of the prepared rock drilling rod can reach 1.2-1.6mm, the carbon content of a surface layer reaches 0.77-0.83%, the surface hardness reaches 54-58HRC, the part hardness reaches 38-45HRC, the fatigue life, the wear resistance, the surface hardness and the like of the rock drilling rod are obviously improved, The core hardness and other key technical indexes obviously improve the metallographic structure of the rock drilling rod, obviously improve the product quality, prolong the average single rock drilling footage life of the rock drilling rod from 300 m-800 m to 1500 m-2500 m, and obviously prolong the service life of the rock drilling rod.
Claims (9)
1. A heat treatment process of a rock drilling rod is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: integral carburizing: putting a rock drilling rod into a vacuum furnace for heating, measuring the temperature in the vacuum furnace by using a temperature measuring gun and an induction thermocouple, enabling the temperature in the vacuum furnace to rise at a speed of less than 3 ℃/s, transferring the rock drilling rod into a carburizing furnace when the rock drilling rod is heated to 850 ℃, simultaneously filling protective gas into the carburizing furnace, adding a carburizing agent, heating the rock drilling rod in the carburizing furnace, measuring the temperature in the vacuum furnace by using the temperature measuring gun and the induction thermocouple, enabling the temperature rise speed in the carburizing furnace to be less than 3 ℃/s, controlling the carbon potential, entering a strong cementation stage when the temperature in the carburizing furnace rises to 900 ℃ and the carbon potential is 1.2%, keeping the temperature of the rock drilling rod for 3-5h, then entering a diffusion stage when the carbon potential is controlled to be 0.8%, keeping the temperature of the rock drilling rod for 2-3h, then reducing the temperature in the carburizing furnace to 850 ℃ at a speed of less than 3 ℃/s, then the rock drilling rod is taken out of the carburizing furnace after heat preservation is carried out for 1h, and the rock drilling rod is naturally cooled to be below 20 ℃;
step two: integral quenching: placing the rock drilling drill rod processed in the first step into a vacuum furnace for heating, measuring the temperature in the vacuum furnace by using a temperature measuring gun and an induction thermocouple, raising the temperature in the vacuum furnace to over 1100 ℃ at a speed of less than 3 ℃/s, then preserving the temperature for 1.5-2 h, then carrying out vacuum oil quenching on the rock drilling drill rod, and taking out the rock drilling drill rod from the vacuum furnace to naturally cool the rock drilling drill rod to below 20 ℃;
step three: integral high-temperature tempering: placing the rock drilling drill rod processed in the second step into a vacuum furnace for heating, measuring the temperature in the vacuum furnace by using a temperature measuring gun and an induction thermocouple, raising the temperature in the vacuum furnace to 450-600 ℃ at a speed of less than 3 ℃/s, then preserving the temperature for 2.5-3.5 h, taking out the rock drilling drill rod when the temperature in the vacuum furnace is reduced to 450 ℃ at a speed of less than 3 ℃/s, and naturally cooling the rock drilling drill rod to be below 20 ℃;
step four: and (3) integral low-temperature tempering: putting the rock drilling drill rod processed in the fourth step into a vacuum furnace for heating, measuring the temperature in the vacuum furnace by using a temperature measuring gun and an induction thermocouple, raising the temperature in the vacuum furnace to 220 ℃ at a speed of less than 3 ℃/s, preserving the temperature for 2h, and then taking out the rock drilling drill rod and naturally cooling the rock drilling drill rod to below 20 ℃;
step five: shot blasting: shot blasting is carried out on the rock drilling rod processed in the fourth step, the shot is cast steel shot, the diameter of the shot is 0.5-1.0mm, and the density is 5500kg/m3The spraying speed is 150-250m/s, the spraying angle is 30-75 degrees, the residual stress of the surface layer of the rock drilling drill rod is eliminated, the generation of fatigue cracks on the surface layer of the rock drilling drill rod is inhibited, and the process is finished.
2. A heat treatment process for a rock drill rod as claimed in claim 1, wherein: in the first step, the protective gas is nitrogen.
3. A heat treatment process for a rock drill rod as claimed in claim 1, wherein: in the first step, the carburizing agent is butane.
4. A heat treatment process for a rock drill rod as claimed in claim 1, wherein: in the step one, the carbon potential is controlled by using an infrared ray or an oxygen probe.
5. A heat treatment process for a rock drill rod as claimed in claim 1, wherein: the heat treatment process for the rock drilling rod further comprises the following steps:
and before the first step, cleaning the surface of the rock drill rod, removing oil stain and then airing.
6. A heat treatment process for a rock drill rod as claimed in claim 1, wherein: the heat treatment process for the rock drilling rod further comprises the following steps:
step 1: in the process of the first step, when the rock drilling rod enters a strong cementation stage, protective gas is filled into a carburizing furnace, so that the internal pressure of the carburizing furnace reaches and is maintained within the range of 1000-2000 Pa;
step 2: in the process of the first step, when the rock drilling rod enters a diffusion stage, extracting a proper amount of protective gas in a carburizing furnace, and reducing the internal pressure of the carburizing furnace to be maintained at 50-500 Pa.
7. A heat treatment process for a rock drill rod as claimed in claim 1, wherein: and in the second step, the quenching medium adopted for carrying out vacuum oil quenching on the rock drilling drill rod is vacuum quenching oil.
8. A heat treatment process for a rock drill rod as claimed in claim 1, wherein: the heat treatment process for the rock drilling rod further comprises the following steps:
and repeating the first step to the third step at least twice after the third step is finished and before the fourth step is carried out.
9. A rock drill rod heat treatment process according to any one of claims 1 to 8, characterised in that: the rock drilling drill rod is H22, H25, H28, H32 or H35.
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| CN111961974B (en) * | 2020-08-20 | 2021-07-09 | 本钢板材股份有限公司 | Preparation method of drill rod tail shaft of tapping machine |
| CN114633218A (en) * | 2022-03-04 | 2022-06-17 | 贵州捷盛钻具股份有限公司 | Surface treatment method and surface treatment device for drill rod and drill rod manufacturing method |
| CN114633218B (en) * | 2022-03-04 | 2023-09-19 | 贵州捷盛钻具股份有限公司 | Surface treatment method and device for drill rod and drill rod manufacturing method |
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