CN115449806B - Production process for improving microstructure uniformity of spring steel - Google Patents
Production process for improving microstructure uniformity of spring steel Download PDFInfo
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- CN115449806B CN115449806B CN202211390817.5A CN202211390817A CN115449806B CN 115449806 B CN115449806 B CN 115449806B CN 202211390817 A CN202211390817 A CN 202211390817A CN 115449806 B CN115449806 B CN 115449806B
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
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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
- C21D1/32—Soft annealing, e.g. spheroidising
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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
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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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
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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
- 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
- C23C22/07—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 containing phosphates
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to the technical field of spring processing, in particular to a production process for improving the microstructure uniformity of spring steel, which comprises the following specific steps: immersing the hot-rolled raw material into hydrochloric acid solution for treatment, and then flushing acid liquor attached to the surface of the material by high-pressure water; neutralizing with NaOH solution, and oven drying at 100-150deg.C for removing surface oxide skin; heating and preserving heat at high temperature in an annealing furnace, and then cooling and discharging; immersing the steel wire into hydrochloric acid solution for treatment; washing off the acid liquor remained on the surface by high-pressure water; neutralizing the mixture after soaking in a phosphating solution, and soaking in a saponification solution for 1-3min; finally, drying at 100-150 ℃; drawing on a continuous drawing machine; and (3) recrystallizing and annealing, and then slowly cooling to below 300 ℃ along with the furnace, and discharging to obtain a uniform and fine spherical pearlite structure. The production process can solve the problem that the uniformity of the current spheroidizing annealing microstructure of the spring steel is not ideal enough.
Description
Technical Field
The invention relates to the technical field of spring processing, in particular to a production process for improving the microstructure uniformity of spring steel.
Background
Spring steel is generally made of medium carbon steel or medium carbon alloy steel, and in order to obtain a good fatigue life, final heat treatment generally adopts a quenching-after-quenching high-temperature tempering or isothermal quenching process to obtain a uniform sorbite structure. In order to obtain a uniform sorbite structure, the structure before quenching is a uniform spherical pearlite structure, so that the base steel is subjected to spheroidizing annealing treatment.
The spheroidizing annealing of steel is generally to heat to 20-30 ℃ above AC1 point (730-750 ℃ for XC65 steel), austenitizing is more sufficient, residual carbide is less, in the subsequent cooling process, for hypoeutectoid steel such as XC65, the leading phase of cooling transformation is ferrite, carbide particles are precipitated in the ferrite, the carbide is easy to grow into coarse flakes again, the carbide particles in the spheroidizing annealing mode are larger, the spheroidizing rate is slightly higher than 70%, the structural uniformity of final heat treatment is poor, and the service life of the finished spring is further influenced. With the increasing demands of vehicles and mechanical equipment on the service life of springs, it is necessary to develop a steel production process to improve the fatigue life of springs.
Disclosure of Invention
The invention aims to provide a production process for improving the uniformity of a spring steel microstructure, which can solve the problem that the uniformity of the current spheroidizing annealing microstructure of the spring steel is not ideal.
In order to solve the technical problems, the invention adopts the following technical scheme: a production process for improving the microstructure uniformity of spring steel comprises the following specific steps:
step one, pickling, namely immersing the steel wire into hydrochloric acid solution for treatment, and then flushing acid liquor attached to the surface of the material by high-pressure water; neutralizing with NaOH solution, and oven drying at 100-150deg.C for removing surface oxide skin;
step two, sub-temperature spheroidizing annealing, namely placing the steel wire in the step one into an annealing furnace, heating at high temperature, preserving heat, and then controlling cooling and discharging;
step three, coating the surface, namely immersing the steel wire into hydrochloric acid solution for treatment; washing off the acid liquor remained on the surface by high-pressure water; neutralizing the mixture after soaking in a phosphating solution, and soaking in a saponification solution for 1-3min; finally, drying at 100-150 ℃ to form a layer of phosphating film on the surface of the steel wire so as to facilitate the subsequent drawing with large reduction rate;
drawing on a continuous drawing machine, and reducing the depth of defects on the surface of the steel wire in order to break the fine lamellar pearlite structure formed in the sub-temperature spheroidizing annealing process;
step five, recrystallizing and annealing, then slowly cooling to below 300 ℃ along with a furnace, and discharging to obtain uniform and fine spherical pearlite structure;
wherein, the annealing furnace in the second step is a hood-type annealing furnace, pure nitrogen is filled in the hood-type annealing furnace and heated to 690-710 ℃, and the temperature is kept for 4-6 hours; the tapping temperature is lower than 500 ℃; the drawing lubricant in the fourth step is dry wire drawing powder, the drawing speed is 2-3m/s, and the total reduction ratio of the steel wire is 50-70%; and in the fifth step, the annealing furnace is a well-type annealing furnace, the well-type annealing furnace is heated to 600-650 ℃, and the temperature is kept for 5-6 hours.
As a further scheme of the invention, in the first step, the steel raw material is of uniform sorbite structure, the grain size is more than 8 grades, the total decarburized layer is less than 0.05mm, and the hardness is less than 45HRC.
As a further scheme of the invention, the concentration of the hydrochloric acid solution in the first step is 120-200g/L, the temperature is 40-50 ℃, and the treatment time is 30-60min; neutralizing with 0.5-2% NaOH solution for 30-60s.
As a further scheme of the invention, the concentration of the hydrochloric acid solution in the step three is 120-200g/L, the temperature is 40-50 ℃, and the treatment time is 15-30min; soaking in 75-85deg.C phosphating solution for 15-30min; neutralizing with 0.5-2% NaOH solution for 30-60s; soaking in saponified solution at 75-85deg.C for 1-3min.
As a further scheme of the invention, the particle size of the spherical pearlite structure in the step five is 1-2 microns, the spheroidization rate is 100%, the tensile strength is 650-750MPa, and the hardness is 180-240HV.
As the technical scheme is adopted, the invention has the advantages and positive effects that:
1. the product produced by the production process can reach the following indexes:
1.1 Tensile strength: 650-750MPa;
1.2 Hardness: 180-240HV;
1.3 Microstructure: the spheroidized carbide particles are 1-2 microns, and the spheroidization rate is 100%.
2. Compared with the conventional process, the process has finer and more uniform microstructure, so that the microstructure of the final product is more uniform, and the service life of the spring is prolonged.
3. Because of the lower spheroidizing annealing temperature, the process saves about 10% of energy consumption compared with the conventional process.
Drawings
FIG. 1 is a schematic view of the microstructure of the present invention.
FIG. 2 is a schematic of the microstructure of the comparative example.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
The invention relates to a steel material with the brand of XC65 and 65 or equivalent brand of metal materials, which comprises the following main chemical components: c:0.60-0.70%, si:0.10-0.40%, mn:0.50-0.80%, P: less than or equal to 0.035 percent, S: less than or equal to 0.035 percent, less than or equal to 0.30 percent of Cr, ni: less than or equal to 0.30 percent, cu: less than or equal to 0.40 percent.
Example 1
3.40mm XC65 spring steel and the preparation method thereof:
1.1, hot rolling raw materials: the diameter is 5.5mm, the steel mill is required to have uniform sorbite structure, the grain size is 8 grade or more, the total decarburized layer is less than 0.05mm, and the hardness is below 45HRC. The chemical components are as follows: c:0.69%, si:0.22%, mn:0.66%, P:0.016%, S:0.005%, cr:0.19%, ni:0.04 percent of Cu and 0.03 percent of Cu.
1.2, acid washing: is carried out on a fully automatic pickling line. Immersing the hot-rolled raw material into hydrochloric acid solution with the temperature of 40-50 ℃ and the concentration of 120-200g/L for 30-60min, and removing oxidized substances on the surface; then washing off acid liquor attached to the surface of the material by high-pressure water; neutralizing with 0.5-2% NaOH solution for 30-60s; and finally drying at 100-150 ℃.
1.3, sub-temperature spheroidizing annealing: and (3) using a hood-type annealing furnace, filling pure nitrogen for protection, heating to 700 ℃, preserving heat for 5 hours, then controlling cooling to below 500 ℃ and rapidly cooling to below 100 ℃ and discharging.
1.4, surface coating: is carried out on a fully automatic pickling line. Immersing the steel wire into hydrochloric acid solution with the temperature of 40-50 ℃ and the concentration of 120-200g/L for 15-30min; washing off the acid liquor remained on the surface by high-pressure water; soaking in 75-85deg.C phosphating solution for 15-30min; neutralizing with 0.5-2% NaOH solution for 30-60s; soaking in saponified solution at 75-85deg.C for 1-3min; and finally drying at 100-150 ℃.
1.5, drawing: drawing on a continuous drawing machine, wherein the size after drawing is phi 3.4+/-0.02 mm, the total surface reduction rate is 61.8%, the drawing lubricant is dry wire drawing powder, and the drawing speed is 2.3m/S.
1.6, recrystallizing and annealing, heating to 650 ℃ by using a well type annealing furnace, preserving heat for 6 hours, and then slowly cooling to below 300 ℃ along with the furnace and discharging.
1.7, as shown in figure 1, the product has the actual measurement of the spheroidization rate of microstructure of 100 percent, carbide particles of 1.0-2.0 mu m, the tensile strength of 650-700MPa and the hardness of 200-240HV.
Example 2
4.00mm XC65 spring steel and the preparation method thereof:
1.1, hot rolling raw materials: the diameter is 6.0mm, the steel mill is required to have uniform sorbite structure, the grain size is 8 grade or more, the total decarburized layer is less than 0.05mm, and the hardness is below 45HRC. The chemical components are as follows: c:0.69%, si:0.22%, mn:0.66%, P:0.016%, S:0.005%, cr:0.19%, ni:0.04 percent of Cu and 0.03 percent of Cu.
1.2, acid washing: is carried out on a fully automatic pickling line. Immersing the hot-rolled raw material into hydrochloric acid solution with the temperature of 40-50 ℃ and the concentration of 120-200g/L for 30-60min, and removing oxidized substances on the surface; then washing off acid liquor attached to the surface of the material by high-pressure water; neutralizing with 0.5-2% NaOH solution for 30-60s; and finally drying at 100-150 ℃.
1.3, sub-temperature spheroidizing annealing: and (3) using a hood-type annealing furnace, filling pure nitrogen for protection, heating to 700 ℃, preserving heat for 5 hours, then controlling cooling to below 500 ℃ and rapidly cooling to below 100 ℃ and discharging.
1.4, surface coating: is carried out on a fully automatic pickling line. Immersing the steel wire into hydrochloric acid solution with the temperature of 40-50 ℃ and the concentration of 120-200g/L for 15-30min; washing off the acid liquor remained on the surface by high-pressure water; soaking in 75-85deg.C phosphating solution for 15-30min; neutralizing with 0.5-2% NaOH solution for 30-60s; soaking in saponified solution at 75-85deg.C for 1-3min; and finally drying at 100-150 ℃.
1.5, drawing: drawing on a continuous drawing machine, wherein the size after drawing is phi 4.0+/-0.02 mm, the total surface reduction rate is 55.6%, the drawing lubricant is dry wire drawing powder, and the drawing speed is 2.3m/S.
1.6, recrystallizing and annealing, heating to 650 ℃ by using a well type annealing furnace, preserving heat for 6 hours, and then slowly cooling to below 300 ℃ along with the furnace and discharging.
1.7, as shown in figure 1, the product has the actual measurement of the spheroidization rate of microstructure of 100 percent, carbide particles of 1.0-2.0 mu m, the tensile strength of 650-700MPa and the hardness of 200-240HV.
The invention needs to be subjected to multiple surface coating, drawing and recrystallization annealing procedures when the size of the prepared finished product is undersized.
Example 3
2.00mm XC65 spring steel and the preparation method thereof:
1.1, hot rolling raw materials: the diameter is 5.5mm, the steel mill is required to have uniform sorbite structure, the grain size is 8 grade or more, the total decarburized layer is less than 0.05mm, and the hardness is below 45HRC. The chemical components are as follows: c:0.69%, si:0.22%, mn:0.66%, P:0.016%, S:0.005%, cr:0.19%, ni:0.04 percent of Cu and 0.03 percent of Cu.
1.2, acid washing: is carried out on a fully automatic pickling line. Immersing the hot-rolled raw material into hydrochloric acid solution with the temperature of 40-50 ℃ and the concentration of 120-200g/L for 30-60min, and removing oxidized substances on the surface; then washing off acid liquor attached to the surface of the material by high-pressure water; neutralizing with 0.5-2% NaOH solution for 30-60s; and finally drying at 100-150 ℃.
1.3, sub-temperature spheroidizing annealing: and (3) using a hood-type annealing furnace, filling pure nitrogen for protection, heating to 700 ℃, preserving heat for 5 hours, then controlling cooling to below 500 ℃ and rapidly cooling to below 100 ℃ and discharging.
1.4, surface coating: is carried out on a fully automatic pickling line. Immersing the steel wire into hydrochloric acid solution with the temperature of 40-50 ℃ and the concentration of 120-200g/L for 15-30min; washing off the acid liquor remained on the surface by high-pressure water; soaking in 75-85deg.C phosphating solution for 15-30min; neutralizing with 0.5-2% NaOH solution for 30-60s; soaking in saponified solution at 75-85deg.C for 1-3min; and finally drying at 100-150 ℃.
1.5, drawing: drawing on a continuous drawing machine, wherein the size after drawing is phi 3.2+/-0.05 mm, the total reduction rate is 66.1%, the drawing lubricant is dry wire drawing powder, and the drawing speed is 2.3m/S.
1.6, recrystallizing and annealing, heating to 650 ℃ by using a well type annealing furnace, preserving heat for 6 hours, and then slowly cooling to below 300 ℃ along with the furnace and discharging.
1.7, surface coating: is carried out on a fully automatic pickling line. Immersing the steel wire into hydrochloric acid solution with the temperature of 40-50 ℃ and the concentration of 120-200g/L for 15-30min; washing off the acid liquor remained on the surface by high-pressure water; soaking in 75-85deg.C phosphating solution for 15-30min; neutralizing with 0.5-2% NaOH solution for 30-60s; soaking in saponified solution at 75-85deg.C for 1-3min; and finally drying at 100-150 ℃.
1.8, drawing: drawing on a continuous drawing machine, wherein the size after drawing is phi 2.0+/-0.02 mm, the total surface reduction rate is 60.9%, the drawing lubricant is dry wire drawing powder, and the drawing speed is 2.3m/S.
1.9, recrystallizing and annealing, heating to 650 ℃ by using a well type annealing furnace, preserving heat for 6 hours, and then slowly cooling to below 300 ℃ along with the furnace and discharging.
1.10, as shown in figure 1, the product has the actual measurement of the spheroidization rate of microstructure of 100 percent, carbide particles of 1.0-2.0 mu m, the tensile strength of 650-700MPa and the hardness of 200-240HV.
Comparative example
Preparation of XC65 spring steel of 3.4mm
1.1, hot rolling raw materials: the diameter is 5.5mm, the chemical components are not detailed, and the mark is XC65.
1.2, acid washing: the conventional process and parameters are not detailed.
1.3, spheroidizing annealing: heating to 740 ℃, preserving heat for 3h, cooling to 680 ℃, preserving heat for 4h, and then cooling to below 500 ℃ along with the furnace, discharging and air cooling.
1.4, surface coating: the conventional pickling phosphorus saponification process has no detailed parameters.
1.5, as shown in FIG. 2, the product has a measured microstructure spheroidization of about 70%, carbide particles 1.0-3.0 μm.
As can be seen from FIGS. 1 and 2, the microstructure obtained by the process is finer and more uniform than that obtained by the conventional process, so that the microstructure of the final product is more uniform, and the service life of the spring is prolonged.
While particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely illustrative, and that many variations or modifications may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined only by the appended claims.
Claims (5)
1. A production process for improving the uniformity of a microstructure of spring steel is characterized by comprising the following steps of: the method comprises the following specific steps:
step one, pickling, namely immersing the steel wire into hydrochloric acid solution for treatment, and then flushing acid liquor attached to the surface of the material by high-pressure water; neutralizing with NaOH solution, and oven drying at 100-150deg.C for removing surface oxide skin;
step two, sub-temperature spheroidizing annealing, namely placing the steel wire in the step one into an annealing furnace, heating at high temperature, preserving heat, and then controlling cooling and discharging;
step three, coating the surface, namely immersing the steel wire into hydrochloric acid solution for treatment; washing off the acid liquor remained on the surface by high-pressure water; neutralizing the mixture after soaking in a phosphating solution, and soaking in a saponification solution for 1-3min; finally, drying at 100-150 ℃ to form a layer of phosphating film on the surface of the steel wire so as to facilitate the subsequent drawing with large reduction rate;
drawing on a continuous drawing machine, and reducing the depth of defects on the surface of the steel wire in order to break the fine lamellar pearlite structure formed in the sub-temperature spheroidizing annealing process;
step five, recrystallizing and annealing, then slowly cooling to below 300 ℃ along with a furnace, and discharging to obtain uniform and fine spherical pearlite structure;
wherein, the annealing furnace in the second step is a hood-type annealing furnace, pure nitrogen is filled in the hood-type annealing furnace and heated to 690-710 ℃, and the temperature is kept for 4-6 hours; the tapping temperature is lower than 500 ℃; the drawing lubricant in the fourth step is dry wire drawing powder, the drawing speed is 2-3m/s, and the total reduction ratio of the steel wire is 50-70%; and in the fifth step, the annealing furnace is a well-type annealing furnace, the well-type annealing furnace is heated to 600-650 ℃, and the temperature is kept for 5-6 hours.
2. The production process for improving the microstructure uniformity of spring steel according to claim 1, wherein the production process comprises the following steps: in the first step, the steel raw material is of a uniform sorbite structure, the grain size is larger than 8 grades, the total decarburized layer is smaller than 0.05mm, and the hardness is smaller than 45HRC.
3. The production process for improving the microstructure uniformity of spring steel according to claim 1, wherein the production process comprises the following steps: the concentration of the hydrochloric acid solution in the first step is 120-200g/L, the temperature is 40-50 ℃, and the treatment time is 30-60min; neutralizing with 0.5-2% NaOH solution for 30-60s.
4. The production process for improving the microstructure uniformity of spring steel according to claim 1, wherein the production process comprises the following steps: the concentration of the hydrochloric acid solution in the third step is 120-200g/L, the temperature is 40-50 ℃, and the treatment time is 15-30min; soaking in 75-85deg.C phosphating solution for 15-30min; neutralizing with 0.5-2% NaOH solution for 30-60S; soaking in saponified solution at 75-85deg.C for 1-3min.
5. The production process for improving the microstructure uniformity of spring steel according to claim 1, wherein the production process comprises the following steps: in the fifth step, the particle size of the spherical pearlite structure is 1-2 microns, the spheroidization rate is 100%, the tensile strength is 650-750MPa, and the hardness is 180-240HV.
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| CN101307378A (en) * | 2008-07-03 | 2008-11-19 | 山西太钢不锈钢股份有限公司 | Spheroidizing annealing process for medium carbon steel plate in bell furnace |
| CN102357627B (en) * | 2011-10-12 | 2013-12-04 | 章升谊 | Method for machining valve spring retainer by continuous cold heading once near net shape forming |
| CN103014284B (en) * | 2012-12-19 | 2014-03-12 | 洛阳宜华滚动体有限公司 | Process for modifying GCr15 steel for manufacturing tapered roller |
| CN204657124U (en) * | 2015-03-25 | 2015-09-23 | 江苏金基特钢有限公司 | The system of processing of high strength bearing spring steel wire |
| CN105624563B (en) * | 2015-12-31 | 2017-12-26 | 钢铁研究总院 | The high-strength bolt steel and wire rod reforming technology of wire rod flow can be shortened |
| CN107322248A (en) * | 2017-08-29 | 2017-11-07 | 洛阳鼎辉特钢制品股份有限公司 | The preparation facilities and preparation method of a kind of zero decarburized layer bearing steel wire rod |
| CN112080627A (en) * | 2020-07-18 | 2020-12-15 | 凯明(常州)新材料科技有限公司 | Recrystallization annealing process of GCr15 bearing steel wire well type annealing furnace |
| CN113680847B (en) * | 2021-10-25 | 2021-12-21 | 凯明(常州)新材料科技有限公司 | Production process of high-strength bearing steel wire |
| CN114433648B (en) * | 2022-02-11 | 2024-04-12 | 无锡天辰冷拉型钢有限公司 | Cold drawing processing method of high-carbon chromium bearing steel guide rail blank |
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