CN114075615A - Production process of vehicle damping spring steel 65Mn wire rod - Google Patents
Production process of vehicle damping spring steel 65Mn wire rod Download PDFInfo
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- CN114075615A CN114075615A CN202111369513.6A CN202111369513A CN114075615A CN 114075615 A CN114075615 A CN 114075615A CN 202111369513 A CN202111369513 A CN 202111369513A CN 114075615 A CN114075615 A CN 114075615A
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- 229910000639 Spring steel Inorganic materials 0.000 title claims abstract description 32
- 238000013016 damping Methods 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000005096 rolling process Methods 0.000 claims abstract description 46
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 35
- 238000001816 cooling Methods 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 229910052742 iron Inorganic materials 0.000 claims abstract description 17
- 238000009749 continuous casting Methods 0.000 claims abstract description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 238000007670 refining Methods 0.000 claims abstract description 8
- 238000003723 Smelting Methods 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 238000004513 sizing Methods 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 5
- 229910052786 argon Inorganic materials 0.000 claims abstract description 4
- 238000007664 blowing Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 23
- 239000010959 steel Substances 0.000 claims description 23
- 239000002893 slag Substances 0.000 claims description 22
- 238000009987 spinning Methods 0.000 claims description 14
- 238000005266 casting Methods 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 229910052593 corundum Inorganic materials 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 2
- 238000005261 decarburization Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 229910000677 High-carbon steel Inorganic materials 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000024121 nodulation Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a production process of a vehicle damping spring steel 65Mn wire rod, which comprises the following chemical components in percentage by weight: 0.62-0.68% of C, Si: 0.17% -0.30%, Mn: 0.90% -1.00%, P: less than or equal to 0.015 percent, S: less than or equal to 0.015 percent, and the balance of Fe and inevitable impurities. The production process comprises molten iron desulphurization, converter smelting, argon blowing, LF refining, continuous casting, square billet heating, high-speed wire rolling and stelmor cooling control. Compared with the prior art, the invention utilizes the equipment advantages of a high-speed wire rolling machine set, and adopts an 8+4 type finishing mill and a reducing sizing mill set for rolling wire rods at high temperature. By optimizing the heating system before rolling, controlling rolling and controlling the cooling process, the surface decarburization of the wire rod is reduced, the fatigue life of the finished spring is prolonged, the metallographic structure is improved to obtain a Gauss body, the strength and the plasticity of the vehicle damping spring steel wire rod are improved, and the purpose of optimizing the metallographic structure and the comprehensive performance of the vehicle damping spring steel 65Mn hot rolled wire rod is achieved.
Description
Technical Field
The invention belongs to the technical field of spring steel production, and particularly relates to a production process of a 65Mn wire rod of vehicle damping spring steel.
Background
Due to the rapid development of the motorcycle and electric vehicle industry, the demand for spring steel is increasing. At present, domestic spring steel is mainly produced by an electric furnace. The spring steel wire has a severe working environment, so the performance requirement is strict; meanwhile, because the length of the spring is short, the manufacturing process of the spring is actually the process of inspecting and checking the performance of the coil rod, the process requirement is high, and many wire rod manufacturers can not produce the product in a practical manner. Spring manufacturing enterprises can only import at a high price or replace the high-carbon steel wire rod, and the spring manufactured by the high-carbon steel wire rod has low strength, poor fatigue resistance and incapable improvement of product quality.
The spring mainly functions to store elastic strain energy and reduce vibration and impact. Springs are generally used under dynamic load (repeated bending stress and repeated torsion stress), so that spring steels are required to have extremely high elastic limit, high yield strength, tensile strength, high yield ratio, high fatigue resistance, sufficient plasticity and toughness, good hardenability and low decarburization sensitivity so as to be easily formed in a high-cold state and to obtain desired properties after heat treatment.
The vehicle damping spring steel 65Mn wire rod needs surface descaling, cold drawing, heat treatment and other processes in the subsequent processing process, so that the surface quality of the wire rod has higher requirements. The 65Mn wire rod of the vehicle damping spring steel is required to have higher cleanliness and component uniformity, and a surface decarburized layer needs to be strictly controlled. If the uniform structure and performance are ensured, otherwise, the performance of the whole wire of the wire rod is not uniform, the wire breakage rate is high in the drawing process, and the yield of finished products is influenced.
Due to the stress characteristic and the working characteristic of the vehicle damping spring, the fatigue life of the spring can be obviously reduced by the decarburized layer on the surface of the spring steel. The rolling process and the heating process of the vehicle damping spring wire rod need to be systematically researched, so that the aim of optimizing the metallographic structure and the comprehensive performance of the vehicle damping spring steel 65Mn is fulfilled.
Disclosure of Invention
The invention provides a production process of a vehicle damping spring steel 65Mn wire rod, and aims to solve the technical problem.
Therefore, the invention adopts the following technical scheme:
a production process of a vehicle damping spring steel 65Mn wire rod comprises the following chemical components in percentage by weight: 0.62-0.68% of C, Si: 0.17% -0.30%, Mn: 0.90% -1.00%, P: less than or equal to 0.015 percent, S: less than or equal to 0.015 percent, and the balance of Fe and inevitable impurities. The production process comprises molten iron desulphurization, converter smelting, argon blowing, LF refining, continuous casting, square billet heating, high-speed wire rolling and stelmor cooling control.
In the molten iron desulphurization procedure, the weight percentage of each element of the molten iron entering the factory is as follows: less than or equal to 0.045% of S, less than or equal to 0.90% of Mn, less than or equal to 0.030% of Cu, less than or equal to 0.080% of Si, the temperature of incoming molten iron is more than or equal to 1250 ℃, and the molten iron is subjected to slag removal;
in the smelting process of the converter, slag is retained and tapped, the thickness of a slag layer is less than or equal to 50mm, the alkalinity R of medium slag is controlled to be 3.0-3.5, the end point carbon is controlled to be less than or equal to 70%, the oxygen is controlled to be 0.040-0.070%, and the tapping target temperature is 1490-1515 ℃;
in the LF refining process, the basicity of the slag is controlled to be 3.0-4.0, and SiO-containing slag is used2、Al2O3Making white slag from a CaO material, and adjusting the fluidity of the slag;
in the continuous casting process, the whole-process protective casting is adopted, so that the entrainment of foreign impurities is reduced, the good fluidity of molten steel is ensured, and the nozzle nodulation is prevented; meanwhile, low-superheat-degree casting and electromagnetic stirring are adopted, and the casting blank pulling speed is controlled to be 1.6-1.8 m/min;
in the square billet heating process, the temperature of a heating section is controlled to be 1030-1070 ℃, the temperature of a soaking section is controlled to be 1090-1120 ℃, the temperature difference of the cross section is less than or equal to 30 ℃, and the furnace time is 120 +/-30 min;
in the high-speed wire rolling process, the initial rolling temperature is controlled to be 1000 +/-50 ℃, the initial rolling temperature is required to ensure that the temperature of steel in the rough rolling and intermediate rolling processes avoids a hot brittle area, the plasticity of the steel is high to the greatest extent, but the initial rolling temperature is too high, which means that the furnace temperature is also high, for the steel, the steel is deformed at the too high furnace temperature, and the deformed rolled piece often causes a steel piling accident of a rolling line; the inlet temperature of the finishing mill is 900 +/-20 ℃, the difference between the inlet temperature of the finishing mill and the spinning temperature cannot be too large in order to control the strength of steel, and the temperature of the reducing sizing mill is 880 +/-20 ℃;
in the stelmor cold control working procedure, the spinning temperature is controlled to be 880 +/-15 ℃; the method for setting the speed of the stelmor controlled cooling line roller way comprises the following steps: the inlet speed of the steel with the diameter of 6.5-8.0 mm is 0.88-1.12 m/s, and the maximum speed is 1.35-1.49 m/s; the inlet speed of the steel with the diameter of 10-12.0 mm is 0.79-1.35 m/s, and the maximum speed is 1.45-1.69 m/s.
Compared with the prior art, the invention utilizes the equipment advantages of a high-speed wire rolling machine set, and adopts an 8+4 type finishing mill and a reducing sizing mill set for rolling wire rods at high temperature. By optimizing the heating system before rolling, controlling rolling and controlling the cooling process, the surface decarburization of the wire rod is reduced, the fatigue life of the finished spring is prolonged, the metallographic structure is improved to obtain a Gauss body, the strength and the plasticity of the vehicle damping spring steel wire rod are improved, and the purpose of optimizing the metallographic structure and the comprehensive performance of the vehicle damping spring steel 65Mn hot rolled wire rod is achieved.
Drawings
FIG. 1 is a photograph of a 5000 Xtimes metallographic structure of a prior art at a spinning temperature of 900 ℃;
FIG. 2 is a photograph of a 5000 Xtimes metallographic structure of the present invention at a spinning temperature of 850 deg.C;
FIG. 3 is a 15000 times metallographic structure photograph of the prior art at a spinning temperature of 900 ℃;
FIG. 4 is a 15000 Xtimes metallographic structure photograph of the present invention at a spinning temperature of 850 deg.C;
FIG. 5 is a photograph of 25000 times metallographic structure of a prior art at a spinning temperature of 900 ℃;
FIG. 6 is a photograph of a 25000 Xtimes metallographic structure of a steel plate at a spinning temperature of 850 ℃ according to the present invention;
FIG. 7 is a photograph of a test of a total decarburized layer (ferrite + transition layer) on one side of a wire rod at a spinning temperature of 900 ℃ in the prior art;
FIG. 8 is a photograph showing the examination of the total decarburized layer (ferrite + transition layer) on one side of the wire rod at a spinning temperature of 850 ℃ in accordance with the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
a production process of a vehicle damping spring steel 65Mn wire rod comprises the following chemical components in percentage by weight: 0.62-0.68% of C, Si: 0.17% -0.30%, Mn: 0.90% -1.00%, P: less than or equal to 0.015 percent, S: less than or equal to 0.015 percent, and the balance of Fe and inevitable impurities. The production process comprises molten iron desulphurization, converter smelting, argon blowing, LF refining, continuous casting, square billet heating, high-speed wire rolling and stelmor cooling control.
In the molten iron desulphurization procedure, the weight percentage of each element of the molten iron entering the factory is as follows: less than or equal to 0.045 percent of S, less than or equal to 0.90 percent of Mn, less than or equal to 0.030 percent of Cu, less than or equal to 0.080 percent of Si, the temperature of incoming molten iron is more than or equal to 1250 ℃, and the molten iron is subjected to slag removal.
In the smelting process of the converter, slag is retained and tapped, the thickness of a slag layer is less than or equal to 50mm, the alkalinity R of medium slag is controlled to be 3.0-3.5, the end point carbon is controlled to be less than or equal to 70%, the oxygen is controlled to be 0.040-0.070%, and the tapping target temperature is 1490-1515 ℃.
In the LF refining process, the alkalinity of the slag is controlled to be 3.0-4.0, special materials are used for manufacturing white slag, and the fluidity of the slag is adjusted.
In the continuous casting process, the whole-process protective casting is adopted, so that the entrainment of foreign impurities is reduced, the good fluidity of molten steel is ensured, and the nozzle nodulation is prevented; meanwhile, low-superheat-degree casting and electromagnetic stirring are adopted, and the casting blank pulling speed is controlled to be 1.6-1.8 m/min.
In the square billet heating process, the temperature of a heating section is controlled to be 1030-1070 ℃, the temperature of a soaking section is controlled to be 1090-1120 ℃, the temperature difference of the cross section is less than or equal to 30 ℃, and the furnace time is 120 +/-30 min.
In the high-speed wire rolling process, the initial rolling temperature is controlled to be 1000 +/-50 ℃, the initial rolling temperature is required to ensure that the temperature of steel in the rough rolling and intermediate rolling processes avoids a hot brittle area, the plasticity of the steel is high to the greatest extent, but the initial rolling temperature is too high, which means that the furnace temperature is also high, for the steel, the steel is deformed at the too high furnace temperature, and the deformed rolled piece often causes a steel piling accident of a rolling line; the inlet temperature of the finishing mill is 900 +/-20 ℃, the difference between the inlet temperature of the finishing mill and the spinning temperature cannot be too large in order to control the strength of steel, and the temperature of the reducing sizing mill is 880 +/-20 ℃.
In the stelmor cold control working procedure, the spinning temperature is controlled to be 880 +/-15 ℃; the method for setting the speed of the stelmor controlled cooling line roller way comprises the following steps: the inlet speed of the steel with the diameter of 6.5-8.0 mm is 0.88-1.12 m/s, and the maximum speed is 1.35-1.49 m/s; the inlet speed of the steel with the diameter of 10-12.0 mm is 0.79-1.35 m/s, and the maximum speed is 1.45-1.69 m/s.
Specifically, the production process of the vehicle damping spring steel 65Mn steel wire rod refers to the following embodiments:
the detailed steps are as follows: blast furnace molten iron → 50 tons of converter steelmaking → LF external refining → protective pouring → billet inspection → billet in-furnace → heating in a walking beam furnace → high-pressure water descaling → rough rolling six-stand rolling → 1# flying shear cutting head → middle rolling six-stand rolling → 2# flying shear cutting tail → middle rolling four-stand rolling → pre-finish rolling four-stand rolling → Zn1WB1 water-cooling tank cooling → finishing rolling eight-stand rolling → Zn2WB2 water-cooling tank cooling → reduction sizing four-stand rolling → Zn3WB2 water-cooling tank cooling → wire spraying machine wire → loose coil cooling → coil collection → P/F wire hook conveyor transportation → finishing sampling, inspection finishing → packing of a Swedish packer → weighing tag → coil unloading → coil strip warehousing → external delivery.
Wherein the heating conditions of the continuous casting slab in the heating furnace are controlled as shown in the following table:
the intermediate temperature measuring point of the preheating section is controlled between 880 ℃ and 920 ℃, the atmosphere in the furnace mainly takes reducibility, and the temperature difference of the head, the middle and the tail of the continuous casting billet is not more than 30 ℃.
The temperature of the inlet of the wire rod entering the finishing mill is 860-880 ℃, the temperature of the inlet of the wire rod entering the reducing sizing mill is 860-880 ℃, and the temperature of the spinning is controlled to be 870-890 ℃.
After rolling, the controlled cooling is carried out by adopting a standard stelmor controlled cooling line, and the stelmor roller speed and the fan air volume are as shown in the following table. The temperature of the lapping point of the wire rod entering the collection reel after cooling is less than or equal to 450 ℃.
The table shows the opening amount of the fan in the stelmor cooling control procedure of different specifications on site.
The mechanical property indexes to be achieved in the embodiment are shown in the following table:
as can be seen from the table, the mechanical properties of the trial-produced phi 6.5-phi 12.0mm vehicle damping spring steel wire rods all reach the internal control requirement value, the reduction of area is generally far higher than the internal control requirement value, the sorbite rate of the wire rods is basically controlled at 90%, and the mechanical properties are excellent. The vehicle damping spring steel 65Mn wire rod provided by the invention has the mechanical property of the wire rod after the lead bath quenching at the early stage of drawing, so that the requirement of canceling the lead bath quenching process at the early stage can be met.
In conclusion, by adopting the production process of the vehicle damping spring steel 65Mn wire rod, advanced production equipment for rolling high-speed wire rods, a matched rolling cooling system and a Stelmor cooling control line can be fully utilized, the metallographic structure of the high-carbon steel wire rod is controlled by a temperature control and rolling technology, and the higher sorbite rate is obtained. Not only obtains better toughness matching of the wire rod, but also can cancel a lead bath quenching process in the early stage of drawing, reduces environmental pollution and meets the requirement of environmental protection.
Claims (7)
1. The production process of the vehicle damping spring steel 65Mn wire rod comprises the procedures of molten iron desulphurization, converter smelting, argon blowing, LF refining, continuous casting, square billet heating, high-speed wire rolling and stelmor cooling control, and is characterized in that:
in the LF refining process, the basicity of the slag is controlled to be 3. O-4.0, and SiO-containing slag is used2、Al2O3Making white slag from CaO;
in the continuous casting process, the whole-process protection casting is adopted, low-superheat-degree casting and electromagnetic stirring are adopted at the same time, and the casting blank drawing speed is controlled to be 1.6-1.8 m/min;
in the square billet heating procedure, the temperature of a heating section is controlled to be 1030-1070 ℃, the temperature of a soaking section is controlled to be 1090-1120 ℃, the temperature difference of the cross section is less than or equal to 30 ℃, and the furnace time is 120 +/-30 min;
in the high-speed wire rolling procedure, the initial rolling temperature is controlled to be 1000 +/-50 ℃, and the hot brittleness temperature area is avoided in the rough rolling and medium rolling processes; the inlet temperature of the finishing mill is 900 +/-20 ℃, and the temperature of the reducing sizing mill is 880 +/-20 ℃.
2. The production process of the vehicle damping spring steel 65Mn wire rod according to claim 1, wherein in the molten iron desulphurization process, the weight percentage of each element of the molten iron entering a factory is as follows: less than or equal to 0.045 percent of S, less than or equal to 0.90 percent of Mn, less than or equal to 0.030 percent of Cu, less than or equal to 0.080 percent of Si, the temperature of incoming molten iron is more than or equal to 1250 ℃, and the molten iron is subjected to slag removal.
3. The production process of the vehicle damping spring steel 65Mn wire rod according to claim 1, wherein in the converter smelting process, slag is retained and tapped, the thickness of a slag layer is less than or equal to 50mm, the alkalinity R of medium slag is controlled to be 3.0-3.5, the end point carbon is controlled to be less than or equal to 70%, the oxygen is controlled to be 0.040-0.070%, and the tapping target temperature is 1490-1515 ℃.
4. The production process of the vehicle damping spring steel 65Mn wire rod according to claim 1, wherein in the stelmor controlled cooling process, the spinning temperature is controlled to be 880 +/-15 ℃.
5. The production process of the vehicle damping spring steel 65Mn wire rod according to claim 4, wherein in the stelmor cooling control procedure, the stelmor cooling control line roller way speed setting method comprises the following steps: the inlet speed of the steel with the diameter of 6.5-8.0 mm is 0.88-1.12 m/s, and the maximum speed is 1.35-1.49 m/s; the inlet speed of the steel with the diameter of 10-12.0 mm is 0.79-1.35 m/s, and the maximum speed is 1.45-1.69 m/s.
6. The production process of the vehicle damping spring steel 65Mn wire rod according to claim 1, wherein the damping spring steel 65Mn wire rod comprises the following chemical components in percentage by weight: 0.62-0.70% of C, Si: 0.17 to 0.37%, Mn: 0.90-1.20%, P: less than or equal to 0.030 percent, S: less than or equal to 0.030 percent, and the balance of Fe and inevitable impurities.
7. The production process of the vehicle damping spring steel 65Mn wire rod according to claim 6, wherein the damping spring steel 65Mn wire rod comprises the following chemical components in percentage by weight: 0.62-0.68% of C, Si: 0.17% -0.30%, Mn: 0.90% -1.00%, P: less than or equal to 0.015 percent, S: less than or equal to 0.015 percent, and the balance of Fe and inevitable impurities.
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