CN109609730B - Isothermal quenching heat treatment process method for medium-chromium grinding balls - Google Patents
Isothermal quenching heat treatment process method for medium-chromium grinding balls Download PDFInfo
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- 238000000227 grinding Methods 0.000 title claims abstract description 73
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 68
- 239000011651 chromium Substances 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000010791 quenching Methods 0.000 title claims abstract description 19
- 230000000171 quenching effect Effects 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 title claims abstract description 17
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 33
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000005507 spraying Methods 0.000 claims abstract description 16
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 14
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 12
- ICAKDTKJOYSXGC-UHFFFAOYSA-K lanthanum(iii) chloride Chemical compound Cl[La](Cl)Cl ICAKDTKJOYSXGC-UHFFFAOYSA-K 0.000 claims abstract description 12
- 239000004323 potassium nitrate Substances 0.000 claims abstract description 12
- 235000010333 potassium nitrate Nutrition 0.000 claims abstract description 12
- 150000003839 salts Chemical class 0.000 claims abstract description 12
- 239000001488 sodium phosphate Substances 0.000 claims abstract description 12
- 229910000162 sodium phosphate Inorganic materials 0.000 claims abstract description 12
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 12
- 229910000349 titanium oxysulfate Inorganic materials 0.000 claims abstract description 12
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims abstract description 12
- 239000011780 sodium chloride Substances 0.000 claims abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 18
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 18
- 239000007789 gas Substances 0.000 claims description 13
- 239000001569 carbon dioxide Substances 0.000 claims description 9
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- -1 electric power Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 2
- 229910052746 lanthanum Inorganic materials 0.000 description 2
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910001037 White iron Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
-
- 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
- C21D1/607—Molten salts
-
- 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
-
- 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
- C21D9/36—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for balls; for rollers
-
- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/50—Treatment of iron or alloys based thereon
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention discloses a medium-chromium grinding ball isothermal quenching heat treatment process method. Preserving the heat of the medium-chromium grinding ball for 15-25min at the temperature of 950-; putting the medium-chromium grinding balls treated in the step (1) into lanthanum chloride, sodium chloride and sodium silicate which are molten at the temperature of 800-850 ℃, and placing 15-30S in the molten mass; putting the medium chromium grinding ball treated in the step (2) into a mixed salt of sodium phosphate, potassium nitrate and titanyl sulfate at the temperature of 200-300 ℃, wherein the putting time is 3-5 min; and (4) putting the medium-chromium grinding balls treated in the step (3) into concentrated sulfuric acid for 5-10 seconds, and then spraying cold water to room temperature. The invention realizes the great improvement of the toughness and the strength of the medium chromium grinding ball through multi-stage isothermal quenching, thereby prolonging the service life of the medium chromium grinding ball.
Description
Technical Field
The invention relates to a medium-chromium grinding ball isothermal quenching heat treatment process method, and belongs to the technical field of heat treatment.
Background
The medium-chromium white cast iron grinding ball is widely used in the industrial fields of cement, electric power, mineral separation, chemical fertilizer and the like. The traditional production process is that the cast M + C medium chromium grinding ball is heated to about 960 ℃ for austenitizing treatment, then air-cooled, and immediately tempered to eliminate partial residual stress in the grinding ball. The main mechanical properties are as follows: alpha is alphak(unnotched radial sampling) 3.5-4. OJ/cm2Hardness of 52-55 HRC, H is about 12000 times of ball with diameter of 80mm in 3.5m ball drop test. The common defects of the grinding ball include surface brittle spalling, out-of-round and fragmentation. The toughness of the grinding ball is poor, and the technological approach of improving the hardness and the abrasion resistance of the material is severely restricted, namely, the toughness and the strength cannot be borne no matter the volume percentage of carbide is increased or the process of further hardening the matrix is selected.
Therefore, a new isothermal quenching heat treatment method is urgently needed, and the toughness of the medium-chromium grinding ball can be greatly improved.
Disclosure of Invention
In view of the above, the invention provides an isothermal quenching heat treatment process method for a medium chromium grinding ball, which realizes the great improvement of the toughness and the strength of the medium chromium grinding ball through multistage isothermal quenching, thereby prolonging the service life of the medium chromium grinding ball.
The invention solves the technical problems by the following technical means:
the invention relates to a medium chromium grinding ball isothermal quenching heat treatment process method, which comprises the following steps:
(1) preserving the heat of the medium-chromium grinding ball for 15-25min at the temperature of 950-;
(2) putting the medium-chromium grinding balls treated in the step (1) into lanthanum chloride, sodium chloride and sodium silicate which are molten at the temperature of 800-850 ℃, and placing 15-30S in the molten mass;
(3) putting the medium chromium grinding ball treated in the step (2) into a mixed salt of sodium phosphate, potassium nitrate and titanyl sulfate at the temperature of 200-300 ℃, wherein the putting time is 3-5 min;
(4) and (4) putting the medium-chromium grinding balls treated in the step (3) into concentrated sulfuric acid for 5-10 seconds, and then spraying cold water to room temperature.
The volume ratio of nitrogen, water vapor, carbon dioxide and methane in the mixed gas in the step (1) is 60-70:5-15:10-20:10-20, and the flow rate of the mixed gas is 1-3 m/s.
In the step (2), the molar ratio of lanthanum chloride to sodium silicate is 1-2:5-10:1-2, and the medium chromium grinding balls are completely soaked into the molten body.
The molar ratio of the sodium phosphate to the potassium nitrate to the titanyl sulfate in the mixed salt obtained in the step (3) is 2-5:15-20: 1-2.
In the step (4), the mass fraction of the concentrated sulfuric acid is more than or equal to 95%, the temperature of the concentrated sulfuric acid is 15-25 ℃, the temperature of the cold water is 5-15 ℃, and the spraying is stopped after the final pH of the spraying water is 3-4.
According to the invention, through three-stage isothermal treatment, in the first stage, mixed gas of nitrogen, steam, carbon dioxide and methane is introduced at high temperature, the methane is decomposed at high temperature to obtain hydrogen and carbon, the carbon can be adhered to the surface of the medium chromium grinding ball, carburization and carbonization reactions can occur under the protection of nitrogen, austenite transformation also occurs, and simultaneously redundant carbon can react with the carbon dioxide to obtain carbon monoxide, so that redundant carbon is consumed.
In the second-stage high-temperature heat treatment process, lanthanum chloride and sodium silicate are dissolved in sodium chloride molten liquid to form molten solution, then the medium-chromium grinding ball treated in the step (1) is completely soaked in the molten solution, silicon and lanthanum in the medium-chromium grinding ball can permeate into the surface of the medium-chromium grinding ball to form bulk phase doping, and trace lanthanum, silicon and metal on the surface of the medium-chromium grinding ball form alloy.
Then the mixed salt of sodium phosphate, potassium nitrate and titanyl sulfate with the temperature of 200-300 ℃ is added, so that the amount of austenite can be effectively reduced, the amount of martensite is increased, meanwhile, the phosphorization and the trace doping of titanium are realized, and the hardness and the toughness are greatly increased.
And then passivation is carried out by concentrated sulfuric acid, so that the surface area of the medium chromium grinding ball can be greatly reduced, and a compact passivation film is formed on the surface to prevent oxidation.
The final data of the hardness and impact toughness of the medium-chromium grinding ball obtained by the process are as follows:
| item | hardness/HRC | Impact toughness (J/cm)2) | Self-abrasion/%) |
| Numerical value | ≥60 | ≥14.5 | ≤0.01％ |
The self-abrasion measuring method comprises the steps of putting the medium-chromium grinding balls into a ball mill to rotate, filling 80% of the volume of the ball mill, then rotating at the rotating speed of 5r/min for 100 hours, and then reducing the mass ratio of the medium-chromium grinding balls to the mass ratio of the originally loaded medium-chromium grinding balls.
The invention has the beneficial effects that: the toughness and the strength of the medium chromium grinding ball are greatly improved through multistage isothermal quenching, so that the service life of the medium chromium grinding ball is prolonged.
Detailed Description
The invention will be described in detail with reference to specific examples, wherein the isothermal quenching heat treatment process for the medium-chromium grinding balls comprises the following steps:
(1) preserving the heat of the medium-chromium grinding ball for 15-25min at the temperature of 950-;
(2) putting the medium-chromium grinding balls treated in the step (1) into lanthanum chloride, sodium chloride and sodium silicate which are molten at the temperature of 800-850 ℃, and placing 15-30S in the molten mass;
(3) putting the medium chromium grinding ball treated in the step (2) into a mixed salt of sodium phosphate, potassium nitrate and titanyl sulfate at the temperature of 200-300 ℃, wherein the putting time is 3-5 min;
(4) and (4) putting the medium-chromium grinding balls treated in the step (3) into concentrated sulfuric acid for 5-10 seconds, and then spraying cold water to room temperature.
The volume ratio of nitrogen, water vapor, carbon dioxide and methane in the mixed gas in the step (1) is 60-70:5-15:10-20:10-20, and the flow rate of the mixed gas is 1-3 m/s.
In the step (2), the molar ratio of lanthanum chloride to sodium silicate is 1-2:5-10:1-2, and the medium chromium grinding balls are completely soaked into the molten body.
The molar ratio of the sodium phosphate to the potassium nitrate to the titanyl sulfate in the mixed salt obtained in the step (3) is 2-5:15-20: 1-2.
In the step (4), the mass fraction of the concentrated sulfuric acid is more than or equal to 95%, the temperature of the concentrated sulfuric acid is 15-25 ℃, the temperature of the cold water is 5-15 ℃, and the spraying is stopped after the final pH of the spraying water is 3-4.
Example 1
A medium chromium grinding ball isothermal quenching heat treatment process method comprises the following steps:
(1) keeping the temperature of the medium chromium grinding ball at 965 ℃ for 20min, and introducing mixed gas of nitrogen, steam, carbon dioxide and methane;
(2) putting the medium-chromium grinding balls treated in the step (1) into lanthanum chloride, sodium chloride and sodium silicate which are molten at the temperature of 830 ℃, and placing 25S in the molten mass;
(3) putting the medium-chromium grinding balls treated in the step (2) into mixed salt of sodium phosphate, potassium nitrate and titanyl sulfate at the temperature of 250 ℃, wherein the putting time is 4 min;
(4) and (4) putting the medium-chromium grinding balls treated in the step (3) into concentrated sulfuric acid for 9S, and then spraying cold water to room temperature.
The volume ratio of nitrogen, water vapor, carbon dioxide and methane in the mixed gas in the step (1) is 65:8:15:10, and the flow rate of the mixed gas is 2.3 m/s.
In the step (2), the molar ratio of lanthanum chloride to sodium silicate is 1.5:8:1.5, and the medium chromium grinding balls are completely soaked into the molten body.
The molar ratio of the sodium phosphate to the potassium nitrate to the titanyl sulfate in the mixed salt in the step (3) is 4:17: 1.2.
And (3) stopping spraying after the mass fraction of the concentrated sulfuric acid in the step (4) is more than or equal to 95%, the temperature of the concentrated sulfuric acid is 22 ℃, the temperature of the cold water is 9 ℃, and the final pH value of the spraying water is 3.5.
The final data of the hardness and impact toughness of the medium-chromium grinding ball obtained by the process are as follows:
| item | hardness/HRC | Impact toughness (J/cm)2) | Self-abrasion/%) |
| Numerical value | 64 | 15.3 | 0.001％ |
Example 2
A medium chromium grinding ball isothermal quenching heat treatment process method comprises the following steps:
(1) keeping the temperature of the medium chromium grinding ball at 975 ℃ for 21min, and introducing a mixed gas of nitrogen, water vapor, carbon dioxide and methane;
(2) putting the medium-chromium grinding balls treated in the step (1) into lanthanum chloride, sodium chloride and sodium silicate which are molten at the temperature of 835 ℃, and placing 20S in the molten mass;
(3) putting the medium-chromium grinding balls treated in the step (2) into a mixed salt of sodium phosphate, potassium nitrate and titanyl sulfate at 275 ℃ for 4 min;
(4) and (4) putting the medium-chromium grinding balls treated in the step (3) into concentrated sulfuric acid for 8S, and then spraying cold water to room temperature.
The volume ratio of nitrogen, water vapor, carbon dioxide and methane in the mixed gas in the step (1) is 66:12:16:16, and the flow rate of the mixed gas is 2.5 m/s.
In the step (2), the molar ratio of lanthanum chloride to sodium silicate is 1.3:8:1.6, and the medium chromium grinding balls are completely soaked into the molten body.
The molar ratio of the sodium phosphate to the potassium nitrate to the titanyl sulfate in the mixed salt in the step (3) is 4:18: 1.8.
And (4) stopping spraying after the mass fraction of the concentrated sulfuric acid is more than or equal to 95%, the temperature of the concentrated sulfuric acid is 22 ℃, the temperature of the cold water is 12 ℃, and the final pH value of the spraying water is 3.8.
The final data of the hardness and impact toughness of the medium-chromium grinding ball obtained by the process are as follows:
the same medium chromium grinding balls are not subjected to isothermal quenching, are quenched by adopting a conventional process and are treated by the methods of the embodiment 1 and the embodiment 2, the obtained medium chromium grinding balls are subjected to ore grinding experiments, are ground until 90% of the materials of the ball grinding materials pass through a 200-mesh sieve, the crushing rate of the medium chromium grinding balls reaches 15% as a standard, and the ground ore quality is 1000 tons, 1800 tons, 2250 tons and 2500 tons respectively, so that the service life of the medium chromium grinding balls obtained by the embodiments 1 and 2 of the invention is greatly prolonged.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (5)
1. A medium chromium grinding ball isothermal quenching heat treatment process method is characterized by comprising the following steps:
(1) preserving the heat of the medium-chromium grinding ball for 15-25min at the temperature of 950-;
(2) putting the medium-chromium grinding balls treated in the step (1) into lanthanum chloride, sodium chloride and sodium silicate which are molten at the temperature of 800-850 ℃, and placing 15-30S in the molten mass;
(3) putting the medium chromium grinding ball treated in the step (2) into a mixed salt of sodium phosphate, potassium nitrate and titanyl sulfate at the temperature of 200-300 ℃, wherein the putting time is 3-5 min;
(4) and (4) putting the medium-chromium grinding balls treated in the step (3) into concentrated sulfuric acid for 5-10 seconds, and then spraying cold water to room temperature.
2. The isothermal quenching heat treatment process method for the medium chromium grinding balls according to claim 1, is characterized in that: the volume ratio of nitrogen, water vapor, carbon dioxide and methane in the mixed gas in the step (1) is 60-70:5-15:10-20:10-20, and the flow rate of the mixed gas is 1-3 m/s.
3. The isothermal quenching heat treatment process method for the medium chromium grinding balls according to claim 1, is characterized in that: in the step (2), the molar ratio of lanthanum chloride to sodium silicate is 1-2:5-10:1-2, and the medium chromium grinding balls are completely soaked into the molten body.
4. The isothermal quenching heat treatment process method for the medium chromium grinding balls according to claim 1, is characterized in that: the molar ratio of the sodium phosphate to the potassium nitrate to the titanyl sulfate in the mixed salt obtained in the step (3) is 2-5:15-20: 1-2.
5. The isothermal quenching heat treatment process method for the medium chromium grinding balls according to claim 1, is characterized in that: in the step (4), the mass fraction of the concentrated sulfuric acid is more than or equal to 95%, the temperature of the concentrated sulfuric acid is 15-25 ℃, the temperature of the cold water is 5-15 ℃, and the spraying is stopped after the final pH of the spraying water is 3-4.
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| CN201811564031.4A CN109609730B (en) | 2018-12-20 | 2018-12-20 | Isothermal quenching heat treatment process method for medium-chromium grinding balls |
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| CN201811564031.4A CN109609730B (en) | 2018-12-20 | 2018-12-20 | Isothermal quenching heat treatment process method for medium-chromium grinding balls |
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| CN109609730B true CN109609730B (en) | 2021-04-02 |
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| JP4969030B2 (en) * | 2003-08-26 | 2012-07-04 | 京セラ株式会社 | Fused metal member and method for producing the same |
| JP2009250266A (en) * | 2008-04-01 | 2009-10-29 | Ntn Corp | Tripod type constant velocity universal joint |
| CN102011058B (en) * | 2010-10-30 | 2013-02-13 | 闫晓峰 | Chromium-vanadium-titanium wear resistant materials and production process thereof |
| CN103710646A (en) * | 2013-12-18 | 2014-04-09 | 宁国市中意耐磨材料有限公司 | Ultrahard low-chromium-content grinding body and manufacturing method thereof |
| CN103898296B (en) * | 2014-04-03 | 2016-03-02 | 北京京奥泰尔新材料科技有限公司 | Rich chromium cast iron wear-resistant ball is heat treated quenching process in aqueous medium |
| CN104131217A (en) * | 2014-07-24 | 2014-11-05 | 宁国市开源电力耐磨材料有限公司 | High-chromium alloy cast ball |
| CN104451045A (en) * | 2014-11-13 | 2015-03-25 | 宁国东方碾磨材料股份有限公司 | Isothermal salt bath quenching heat treatment process of wear-resistant material |
| CN104878279A (en) * | 2015-05-06 | 2015-09-02 | 柳州科尔特锻造机械有限公司 | Quenching process/method for spheroidal graphite cast iron grinding ball |
| KR102563429B1 (en) * | 2015-10-30 | 2023-08-04 | 테크니쉐 유니버시테이트 델프트 | Magnetocaloric materials containing manganese, iron, silicon, phosphorus, and nitrogen |
| CN106676235A (en) * | 2015-11-09 | 2017-05-17 | 北京环磨科技有限公司 | Processing method of CADI (Carbidic Austempered Ductile Iron) grinding balls for grinding machine |
| CN105969947A (en) * | 2016-05-26 | 2016-09-28 | 安徽省宁国诚信耐磨材料有限公司 | Method of isothermal quenching thermal treatment production line |
| CN105969948B (en) * | 2016-07-25 | 2018-08-10 | 白城北奥新材料科技有限公司 | A kind of oil cooling isothermal hardening production method of high-performance austempered ductile iron |
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