CN113957339A - High-strength steel block processing technology - Google Patents
High-strength steel block processing technology Download PDFInfo
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- CN113957339A CN113957339A CN202111178335.9A CN202111178335A CN113957339A CN 113957339 A CN113957339 A CN 113957339A CN 202111178335 A CN202111178335 A CN 202111178335A CN 113957339 A CN113957339 A CN 113957339A
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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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
- C21D1/26—Methods of annealing
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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
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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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
- C21D6/005—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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
-
- 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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
Abstract
The invention discloses a high-strength steel block processing technology, and relates to the technical field of steel production. The high-strength steel block processing technology comprises the following steps of: 0.14 to 0.18% of C, 0.28 to 0.37% of Si, 0.58 to 0.68% of Mn, 1.25 to 1.40% of Cr, 0.30 to 0.50% of Ni, 0.150 to 0.25% of Mo, 0.08 to 0.15% of V, 0.05 to 0.10% of Cu, 0.02 to 0.03% of Nb, 0.003 to 0.005% of N, and the balance of Fe; the method comprises the following steps: the method comprises the following steps: blanking: adding raw materials into an electric furnace or a converter for steelmaking to produce steel blocks; step two: the preparation treatment comprises the specific steps of air cooling the steel block at 850-900 ℃ for 1-2 hours, and then air cooling the steel block at 620-680 ℃ for 10 hours. According to the high-strength steel block processing technology, the specific contents of Mo, V, Nb and N are adopted, and the reduction rate in the a + y two-phase region is changed, so that the compressive strength and the yield strength of the steel block are better improved, the quality of the steel block is improved, the phase change strengthening degree of the steel block can be increased through multiple quenching and tempering steps, the antirust performance of the steel block can be improved through antirust treatment, and the service life of the steel block is prolonged.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to a high-strength steel block processing technology.
Background
The steel is a general term for iron-carbon alloys with a carbon content between 0.02% and 2.11% by mass. The chemical composition of the steel can vary greatly, and steels containing only carbon elements are called carbon steels (carbon steels) or ordinary steels; in actual production, steel often contains different alloying elements according to different applications, such as: manganese, nickel, vanadium and the like, and the steel block has the advantages of good hardenability, high hardness, wear resistance, small heat treatment deformation and the like, but the traditional steel has larger brittleness, and the problem to be solved is how to improve the obdurability and prevent the early fracture failure of the steel block. At present, no clear technical scheme exists for improving the strength of the steel block, and therefore the invention provides a novel solution.
Disclosure of Invention
The invention aims to provide a high-strength steel block processing technology to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the high-strength steel block processing technology comprises the following steps of: 0.14 to 0.18% of C, 0.28 to 0.37% of Si, 0.58 to 0.68% of Mn, 1.25 to 1.40% of Cr, 0.30 to 0.50% of Ni, 0.150 to 0.25% of Mo, 0.08 to 0.15% of V, 0.05 to 0.10% of Cu, 0.02 to 0.03% of Nb, 0.003 to 0.005% of N, and the balance of Fe;
the method comprises the following steps:
the method comprises the following steps: blanking: adding raw materials into an electric furnace or a converter for steelmaking to produce steel blocks;
step two: the preparation treatment comprises the specific steps of air cooling the steel block at 850-;
step three: preheating treatment: annealing the steel block subjected to air cooling in the step two at the temperature of 850-; then heating the steel plate at 950-; tempering the quenched sample blank at 560 ℃, 600 ℃, 640 ℃ and 710 ℃ for 2h, 3h, 5h and 6h in sequence, and then air cooling the steel block to room temperature;
step four: rolling treatment, which comprises the following steps: rolling the steel block after air cooling in the third step at 680-750 ℃, controlling the reduction rate in an a + y two-phase region at 24-25%, and cooling the steel block to room temperature to obtain a steel block blank;
step five: and (4) product production: and D, chemically cleaning the steel block blank in the fourth step, cutting off burrs at two ends of the steel block blank to obtain a finished steel block, polishing and cleaning the finished steel block, and packaging the finished steel block.
As a preferable technical solution in the present application, the fourth step further includes performing rust prevention treatment on the cooled steel block, and the specific steps are as follows: and soaking the steel forging in the antirust agent solution for 2-3h, and then taking out and drying.
As a preferred technical solution in the present application, the chemical cleaning in the step five specifically includes: and (2) putting the steel block blank steel ball into an acid solution with the pH value of 5.2-6.8 for acid washing, putting the steel block blank into an acid solution with the pH value of 3.2-4.6 for acid washing, finally washing the steel block blank by using high-pressure water flow, and naturally drying.
As a preferable technical scheme in the application, the acid washing time in the acid solution with the pH value of 5.2-6.8 is 5-10 min, and the acid washing time in the acid solution with the pH value of 3.2-4.6 is 3-5 min.
As a preferred technical scheme in the application, the polishing and cleaning in the fifth step specifically comprises the steps of polishing the finished steel block, and then performing air bath treatment on the polished finished steel block by using an air cooler.
As a preferred technical scheme in the application, the specific steps of the air bath treatment are as follows; and (3) placing the finished steel block under an air cooler, setting the temperature of the air cooler to be 5-12 ℃, removing impurities on the surface of the finished steel block, and then cooling the finished steel block to room temperature.
As a preferable technical scheme in the application, the antirust agent is prepared by mixing and dissolving the following raw materials in percentage by mass: 30-35% of diethanolamine, 20-25% of potassium hydroxide, 5-8% of oxalic acid, 5-8% of phosphoric acid and the balance of deionized water.
Compared with the prior art, the invention has the beneficial effects that:
according to the high-strength steel block processing technology, the specific contents of Mo, V, Nb and N are adopted, and the reduction rate in an a + y two-phase region is changed, so that the compressive strength and the yield strength of the steel block are well improved, the quality of the steel block is improved, the phase change strengthening degree of the steel block can be increased through multiple quenching and tempering steps, the antirust performance of the steel block can be improved through antirust treatment, and the service life of the steel block is prolonged.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The mechanism of strengthening dislocations by hot rolling is to increase the strength of steel by introducing rolling strain into ferrite under a low-temperature region where ferrite is generated to increase the dislocation density. This strengthening is also called work hardening. In the dislocation strengthening mechanism, it is effective to increase the yield strength by reducing the rolling load in a low temperature region where the dislocations introduced by rolling are not easily annihilated, particularly in a ferrite + austenite (a + y) two-phase region.
The first embodiment is as follows: the steel block is carbon steel, and the carbon steel comprises the following chemical components in percentage by mass: 0.18% of C, 0.32% of Si, 65% of Mn, 1.30% of Cr, 0.45% of Ni, 0.22% of Mo, 0.14% of V, 0.10% of Cu, 0.03% of Nb, 0.004% of N and the balance of Fe; adding raw materials into an electric furnace or a converter for steelmaking to produce steel blocks; air-cooling the steel block at 850-900 ℃ for 1-2 hours, and then air-cooling the steel block at 620-680 ℃ for 10 hours; annealing the air-cooled steel block at 850-900 ℃ for 2h, cooling the steel block to 600 ℃, and discharging and air-cooling the steel block; then heating the steel plate at 950-; tempering the quenched sample blank at 560 ℃, 600 ℃, 640 ℃ and 710 ℃ for 2h, 3h, 5h and 6h in sequence, and then air cooling the steel block to room temperature; rolling the air-cooled steel block at 680-750 ℃, controlling the reduction rate in an a + y two-phase region to be 25%, cooling the steel block to room temperature to obtain a steel block blank, soaking the steel forging in an antirust agent solution for 2-3h, taking out and drying, wherein the antirust agent is prepared by mixing and dissolving the following raw materials in percentage by mass: 30-35% of diethanolamine, 20-25% of potassium hydroxide, 5-8% of oxalic acid, 5-8% of phosphoric acid and the balance of deionized water; putting steel block blank steel balls into an acid solution with the pH value of 5.2-6.8 for pickling for 5-10 min, putting the steel block blank into an acid solution with the pH value of 3.2-4.6 for pickling for 3-5 min, finally washing the steel block blank by using high-pressure water flow, naturally drying, cutting off burrs at two ends of the steel block blank to obtain a finished steel block, polishing the finished steel block, putting the polished finished steel block under an air cooler, setting the temperature of the air cooler to be 5-12 ℃, removing impurities on the surface of the finished steel block, cooling the finished steel block to the room temperature, and packaging the finished steel block.
Example two: the steel block is carbon steel, and the carbon steel comprises the following chemical components in percentage by mass: 0.18% C, 0.32% Si, 65% Mn, 1.30% Cr, 0.45% Ni, 0.22% Mo, 0.14% V, 0.10% Cu and 0.03% Nb, the balance being Fe; adding raw materials into an electric furnace or a converter for steelmaking to produce steel blocks; air-cooling the steel block at 850-900 ℃ for 1-2 hours, and then air-cooling the steel block at 620-680 ℃ for 10 hours; annealing the air-cooled steel block at 850-900 ℃ for 2h, cooling the steel block to 600 ℃, and discharging and air-cooling the steel block; then heating the steel plate at 950-; tempering the quenched sample blank at 560 ℃, 600 ℃, 640 ℃ and 710 ℃ for 2h, 3h, 5h and 6h in sequence, and then air cooling the steel block to room temperature; rolling the air-cooled steel block at 680-750 ℃, controlling the reduction rate in an a + y two-phase region at 24-25%, cooling the steel block to room temperature to obtain a steel block blank, soaking the steel forging in an antirust solution for 2-3h, taking out and drying, wherein the antirust is prepared by mixing and dissolving the following raw materials in percentage by mass: 30-35% of diethanolamine, 20-25% of potassium hydroxide, 5-8% of oxalic acid, 5-8% of phosphoric acid and the balance of deionized water; putting steel block blank steel balls into an acid solution with the pH value of 5.2-6.8 for pickling for 5-10 min, putting the steel block blank into an acid solution with the pH value of 3.2-4.6 for pickling for 3-5 min, finally washing the steel block blank by using high-pressure water flow, naturally drying, cutting off burrs at two ends of the steel block blank to obtain a finished steel block, polishing the finished steel block, putting the polished finished steel block under an air cooler, setting the temperature of the air cooler to be 5-12 ℃, removing impurities on the surface of the finished steel block, cooling the finished steel block to the room temperature, and packaging the finished steel block
Example three: the steel block is carbon steel, and the carbon steel comprises the following chemical components in percentage by mass: 0.18% of C, 0.32% of Si, 65% of Mn, 1.30% of Cr, 0.45% of Ni, 0.22% of Mo, 0.14% of V, 0.10% of Cu, 0.03% of Nb, 0.004% of N and the balance of Fe; adding raw materials into an electric furnace or a converter for steelmaking to produce steel blocks; air-cooling the steel block at 850-900 ℃ for 1-2 hours, and then air-cooling the steel block at 620-680 ℃ for 10 hours; annealing the air-cooled steel block at 850-900 ℃ for 2h, cooling the steel block to 600 ℃, and discharging and air-cooling the steel block; then heating the steel plate at 950-; tempering the quenched sample blank at 560 ℃, 600 ℃, 640 ℃ and 710 ℃ for 2h, 3h, 5h and 6h in sequence, and then air cooling the steel block to room temperature; rolling the air-cooled steel block at 680-750 ℃, cooling the steel block to room temperature to obtain a steel block blank, soaking the steel forging in an antirust agent solution for 2-3h, taking out and drying, wherein the antirust agent is prepared by mixing and dissolving the following raw materials in percentage by mass: 30-35% of diethanolamine, 20-25% of potassium hydroxide, 5-8% of oxalic acid, 5-8% of phosphoric acid and the balance of deionized water; putting steel block blank steel balls into an acid solution with the pH value of 5.2-6.8 for pickling for 5-10 min, putting the steel block blank into an acid solution with the pH value of 3.2-4.6 for pickling for 3-5 min, finally washing the steel block blank by using high-pressure water flow, naturally drying, cutting off burrs at two ends of the steel block blank to obtain a finished steel block, polishing the finished steel block, putting the polished finished steel block under an air cooler, setting the temperature of the air cooler to be 5-12 ℃, removing impurities on the surface of the finished steel block, cooling the finished steel block to the room temperature, and packaging the finished steel block.
Example four: the steel block is carbon steel, and the carbon steel comprises the following chemical components in percentage by mass: 0.18% of C, 0.32% of Si, 65% of Mn, 1.30% of Cr, 0.45% of Ni, 0.15% of Mo, 0.08% of V, 0.10% of Cu, 0.03% of Nb, 0.004% of N and the balance of Fe; adding raw materials into an electric furnace or a converter for steelmaking to produce steel blocks; air-cooling the steel block at 850-900 ℃ for 1-2 hours, and then air-cooling the steel block at 620-680 ℃ for 10 hours; annealing the air-cooled steel block at 850-900 ℃ for 2h, cooling the steel block to 600 ℃, and discharging and air-cooling the steel block; then heating the steel plate at 950-; tempering the quenched sample blank at 560 ℃, 600 ℃, 640 ℃ and 710 ℃ for 2h, 3h, 5h and 6h in sequence, and then air cooling the steel block to room temperature; rolling the air-cooled steel block at 680-750 ℃, controlling the reduction rate in an a + y two-phase region at 24-25%, cooling the steel block to room temperature to obtain a steel block blank, soaking the steel forging in an antirust solution for 2-3h, taking out and drying, wherein the antirust is prepared by mixing and dissolving the following raw materials in percentage by mass: 30-35% of diethanolamine, 20-25% of potassium hydroxide, 5-8% of oxalic acid, 5-8% of phosphoric acid and the balance of deionized water; putting steel block blank steel balls into an acid solution with the pH value of 5.2-6.8 for pickling for 5-10 min, putting the steel block blank into an acid solution with the pH value of 3.2-4.6 for pickling for 3-5 min, finally washing the steel block blank by using high-pressure water flow, naturally drying, cutting off burrs at two ends of the steel block blank to obtain a finished steel block, polishing the finished steel block, putting the polished finished steel block under an air cooler, setting the temperature of the air cooler to be 5-12 ℃, removing impurities on the surface of the finished steel block, cooling the finished steel block to the room temperature, and packaging the finished steel block
Example five: the steel block is carbon steel, and the carbon steel comprises the following chemical components in percentage by mass: 0.18% C, 0.32% Si, 65% Mn, 1.30% Cr, 0.45% Ni, 0.22% Mo, 0.14% V, 0.10% Cu, 0.03% Nb, 0.001% N, and the balance Fe; adding raw materials into an electric furnace or a converter for steelmaking to produce steel blocks; air-cooling the steel block at 850-900 ℃ for 1-2 hours, and then air-cooling the steel block at 620-680 ℃ for 10 hours; annealing the air-cooled steel block at 850-900 ℃ for 2h, cooling the steel block to 600 ℃, and discharging and air-cooling the steel block; then heating the steel plate at 950-; tempering the quenched sample blank at 560 ℃, 600 ℃, 640 ℃ and 710 ℃ for 2h, 3h, 5h and 6h in sequence, and then air cooling the steel block to room temperature; rolling the air-cooled steel block at 680-750 ℃, controlling the reduction rate in an a + y two-phase region at 24-25%, cooling the steel block to room temperature to obtain a steel block blank, soaking the steel forging in an antirust solution for 2-3h, taking out and drying, wherein the antirust is prepared by mixing and dissolving the following raw materials in percentage by mass: 30-35% of diethanolamine, 20-25% of potassium hydroxide, 5-8% of oxalic acid, 5-8% of phosphoric acid and the balance of deionized water; putting steel block blank steel balls into an acid solution with the pH value of 5.2-6.8 for pickling for 5-10 min, putting the steel block blank into an acid solution with the pH value of 3.2-4.6 for pickling for 3-5 min, finally washing the steel block blank by using high-pressure water flow, naturally drying, cutting off burrs at two ends of the steel block blank to obtain a finished steel block, polishing the finished steel block, putting the polished finished steel block under an air cooler, setting the temperature of the air cooler to be 5-12 ℃, removing impurities on the surface of the finished steel block, cooling the finished steel block to the room temperature, and packaging the finished steel block.
Comparative example one: the steel block is carbon steel, and the carbon steel comprises the following chemical components in percentage by mass: 0.18% of C, 0.32% of Si, 65% of Mn, 1.30% of Cr, 0.45% of Ni, 0.10% of Cu and the balance of Fe; adding raw materials into an electric furnace or a converter for steelmaking to produce steel blocks; air-cooling the steel block at 850-900 ℃ for 1-2 hours, and then air-cooling the steel block at 620-680 ℃ for 10 hours; annealing the air-cooled steel block at 850-900 ℃ for 2h, cooling the steel block to 600 ℃, and discharging and air-cooling the steel block; then heating the steel plate at 950-; tempering the quenched sample blank at 560 ℃, 600 ℃, 640 ℃ and 710 ℃ for 2h, 3h, 5h and 6h in sequence, and then air cooling the steel block to room temperature; rolling the air-cooled steel block at 680-750 ℃, cooling the steel block to room temperature to obtain a steel block blank, soaking the steel forging in an antirust agent solution for 2-3h, taking out and drying, wherein the antirust agent is prepared by mixing and dissolving the following raw materials in percentage by mass: 30-35% of diethanolamine, 20-25% of potassium hydroxide, 5-8% of oxalic acid, 5-8% of phosphoric acid and the balance of deionized water; putting steel block blank steel balls into an acid solution with the pH value of 5.2-6.8 for pickling for 5-10 min, putting the steel block blank into an acid solution with the pH value of 3.2-4.6 for pickling for 3-5 min, finally washing the steel block blank by using high-pressure water flow, naturally drying, cutting off burrs at two ends of the steel block blank to obtain a finished steel block, polishing the finished steel block, putting the polished finished steel block under an air cooler, setting the temperature of the air cooler to be 5-12 ℃, removing impurities on the surface of the finished steel block, cooling the finished steel block to the room temperature, and packaging the finished steel block.
Steel blocks having a thickness of 25mm were manufactured according to the manufacturing procedures of examples one to five and comparative examples, and the steel blocks were tested for compression strength (MPa) and yield strength (MPa), and the test results are as follows:
although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The high-strength steel block processing technology is characterized in that: the steel block is carbon steel, and the carbon steel comprises the following chemical components in percentage by mass: 0.14 to 0.18% of C, 0.28 to 0.37% of Si, 0.58 to 0.68% of Mn, 1.25 to 1.40% of Cr, 0.30 to 0.50% of Ni, 0.150 to 0.25% of Mo, 0.08 to 0.15% of V, 0.05 to 0.10% of Cu, 0.02 to 0.03% of Nb, 0.003 to 0.005% of N, and the balance of Fe;
the method comprises the following steps:
the method comprises the following steps: blanking: adding raw materials into an electric furnace or a converter for steelmaking to produce steel blocks;
step two: the preparation treatment comprises the specific steps of air cooling the steel block at 850-;
step three: preheating treatment: annealing the steel block subjected to air cooling in the step two at the temperature of 850-; then heating the steel plate at 950-; tempering the quenched sample blank at 560 ℃, 600 ℃, 640 ℃ and 710 ℃ for 2h, 3h, 5h and 6h in sequence, and then air cooling the steel block to room temperature;
step four: rolling treatment, which comprises the following steps: rolling the steel block after air cooling in the third step at 680-750 ℃, controlling the reduction rate in an a + y two-phase region at 24-25%, and cooling the steel block to room temperature to obtain a steel block blank;
step five: and (4) product production: and D, chemically cleaning the steel block blank in the fourth step, cutting off burrs at two ends of the steel block blank to obtain a finished steel block, polishing and cleaning the finished steel block, and packaging the finished steel block.
2. The high-strength steel block machining process according to claim 1, characterized in that: the fourth step also comprises the step of carrying out rust prevention treatment on the cooled steel block, and the specific steps are as follows: and soaking the steel forging in the antirust agent solution for 2-3h, and then taking out and drying.
3. The high-strength steel block machining process according to claim 1, characterized in that: the chemical cleaning in the fifth step specifically comprises: and (2) putting the steel block blank steel ball into an acid solution with the pH value of 5.2-6.8 for acid washing, putting the steel block blank into an acid solution with the pH value of 3.2-4.6 for acid washing, finally washing the steel block blank by using high-pressure water flow, and naturally drying.
4. The high-strength steel block machining process according to claim 3, characterized in that: the acid washing time in the acid solution with the pH value of 5.2-6.8 is 5-10 min, and the acid washing time in the acid solution with the pH value of 3.2-4.6 is 3-5 min.
5. The high-strength steel block machining process according to claim 1, characterized in that: and polishing the finished steel block, and then performing air bath treatment on the polished finished steel block by using an air cooler.
6. The high-strength steel block machining process according to claim 5, characterized in that: the air bath treatment comprises the following specific steps of; and (3) placing the finished steel block under an air cooler, setting the temperature of the air cooler to be 5-12 ℃, removing impurities on the surface of the finished steel block, and then cooling the finished steel block to room temperature.
7. The high-strength steel block machining process according to claim 2, characterized in that: the antirust agent is prepared by mixing and dissolving the following raw materials in percentage by mass: 30-35% of diethanolamine, 20-25% of potassium hydroxide, 5-8% of oxalic acid, 5-8% of phosphoric acid and the balance of deionized water.
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| CN109266964A (en) * | 2018-10-25 | 2019-01-25 | 青岛天赢智能工业股份有限公司 | A kind of steel forgings production and processing technology |
| CN109852767A (en) * | 2019-01-11 | 2019-06-07 | 湖南华菱涟源钢铁有限公司 | Thermal treatment cooling equipment |
| CN110202087A (en) * | 2019-07-15 | 2019-09-06 | 海门市明珠钢球有限公司 | High strength steel ball processing technique |
| US20210054476A1 (en) * | 2018-01-05 | 2021-02-25 | The University Of Hong Kong | Automotive steel and a method for the fabrication of the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20210054476A1 (en) * | 2018-01-05 | 2021-02-25 | The University Of Hong Kong | Automotive steel and a method for the fabrication of the same |
| CN109266964A (en) * | 2018-10-25 | 2019-01-25 | 青岛天赢智能工业股份有限公司 | A kind of steel forgings production and processing technology |
| CN109852767A (en) * | 2019-01-11 | 2019-06-07 | 湖南华菱涟源钢铁有限公司 | Thermal treatment cooling equipment |
| CN110202087A (en) * | 2019-07-15 | 2019-09-06 | 海门市明珠钢球有限公司 | High strength steel ball processing technique |
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Application publication date: 20220121 |