CN113584265A - High-strength antirust alloy spring steel wire - Google Patents
High-strength antirust alloy spring steel wire Download PDFInfo
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- C21D1/18—Hardening; Quenching with or without subsequent tempering
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Abstract
A high-strength antirust alloy spring steel wire is prepared by carrying out austenitizing treatment on an alloy spring steel strip, then carrying out quenching treatment, cooling after heat treatment, and finally carrying out cold rolling forming in a spring steel wire cold drawing mode; the paint comprises the following chemical components in percentage by weight: c: 0.56-0.64%, Si: 1.65-1.95%, Mn: 0.61-0.89%, Cr: 0.22-0.35%, Nb: 0.020 to 0.050%, Zr: 0.03-1.20%, V: 0.028-0.048%, B: 0.002-0.004%, P: less than or equal to 0.01 percent, S: less than or equal to 0.01 percent. The improvement is carried out on the basis of silicon-manganese spring steel, and elements Zr, B, V and Nb are added, so that the strength of the steel is obviously improved; and further providing the defects of strength and plasticity and the antirust property through a heat treatment process to obtain the high-strength antirust alloy spring steel wire.
Description
Technical Field
The invention belongs to the technical field of clean production and deep processing of aluminum, copper, magnesium and titanium alloys, and particularly relates to a high-strength antirust alloy spring steel wire.
Background
The spring steel wire is a steel wire used for making springs or steel wire molded parts. The spring steel wires required for making springs are various according to different purposes of the springs. The main categories are: (1) the steel wire for cold-rolled springs is not subjected to heat treatment or is applied after being heated only at low temperature after the springs are cold-rolled and formed, and mainly is a carbon spring steel wire; (2) the spring steel wire after the spring coiling is subjected to heat treatment, and mainly is an alloy spring steel wire; (3) quenching and tempering the spring steel wire, which is also called oil quenching-tempering the spring steel wire; (4) stainless spring steel wire, which is mostly made of austenitic stainless steel.
The alloy spring steel wire is made of alloy spring steel such as silicon-manganese, chromium-vanadium and the like. Incomplete annealing is adopted for softening the wire rod. Decarburization is prevented during heat treatment, and graphite carbon is prevented from being precipitated on the silicon-containing spring steel wire rod. The heat treatment of the semi-finished product adopts recrystallization annealing. The acid washing and coating process is similar to the production of carbon spring steel wire. According to requirements, the silicon-manganese spring steel wire has different delivery states of cold drawing, annealing, normalizing, high-temperature tempering, silvering, oil quenching-tempering and the like; the chromium-vanadium spring steel wire has delivery states of cold drawing, annealing, silvery brightness and the like. After being wound into a spring, the common alloy spring steel wire can be used after quenching and medium-temperature tempering.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a high-strength antirust alloy spring steel wire, which improves the strength and the antirust performance by regulating and controlling the components and the heat treatment process.
The technical scheme adopted by the invention is as follows:
a preparation process of a high-strength antirust alloy spring steel wire comprises the following steps:
(1) austenitizing treatment: placing the alloy spring steel strip into a fluid graphite particle electric furnace, heating to 850-; austenitizing the internal structure of the steel strip at the temperature;
(2) quenching: then carrying out isothermal quenching within the martensite transformation temperature range of the alloy spring steel strip, wherein the isothermal quenching temperature is 210-220 ℃, and the heat preservation time is 1-2 min; and (2) austenite formed in the steel strip after the treatment in the step (1) is gradually transformed into martensite, and the hardness, the wear resistance, the toughness and the elasticity of the steel strip are improved.
(3) Carrying out low-temperature quenching on the alloy spring steel strip processed in the step 2; incomplete martensite inside the steel strip tends to be complete, and the mechanical property of the steel is improved.
(4) Heat treatment is carried out for 2-3h at the temperature of 420-; at the temperature, the internal stress formed in the quenching process can be eliminated, and the internal defects of the steel can be eliminated; further improving the toughness and having good comprehensive mechanical property.
(5) Cooling the alloy spring steel strip obtained in the step (3) to room temperature by water; the hardenability of the steel can be improved, and the mechanical property of the steel strip can be further improved.
(6) And (3) cold-rolling the alloy spring steel strip in a spring steel wire cold-drawing mode to form the alloy spring steel strip.
Further, the alloy spring steel strip is prepared from the following chemical components in percentage by weight: c: 0.56-0.64%, Si: 1.65-1.95%, Mn: 0.61-0.89%, Cr: 0.22-0.35%, Nb: 0.020 to 0.050%, Zr: 0.03-1.20%, V: 0.028-0.048%, B: 0.002-0.004%, P: less than or equal to 0.01 percent, S: less than or equal to 0.01 percent. O: less than or equal to 0.01 percent, less than or equal to 0.02 percent of N, and the balance of Fe and unremovable impurities.
Preferably, the alloy spring steel strip is prepared from the following chemical components in percentage by weight: c: 0.64%, Si: 1.95%, Mn: 0.89%, Cr: 0.30%, Nb: 0.020%, Zr: 0.52%, V: 0.028%, B: 0.004%, P: less than or equal to 0.01 percent, S: less than or equal to 0.01 percent, O: less than or equal to 0.01 percent, less than or equal to 0.02 percent of N, and the balance of Fe and non-removable impurities;
or the alloy spring steel strip comprises the following chemical components in percentage by weight: c: 0.51%, Si: 1.78%, Mn: 0.82%, Cr: 0.35%, Nb: 0.050%, Zr: 1.20%, V: 0.048%, B: 0.003%, P: less than or equal to 0.01 percent, S: less than or equal to 0.01 percent, O: less than or equal to 0.01 percent, less than or equal to 0.02 percent of N, and the balance of Fe and non-removable impurities;
or the alloy spring steel strip comprises the following chemical components in percentage by weight: c: 0.57%, Si: 1.65%, Mn: 0.65%, Cr: 0.22%, Nb: 0.04%, Zr: 0.23%, V: 0.036%, B: 0.002%, P: less than or equal to 0.01 percent, S: less than or equal to 0.01 percent, O: less than or equal to 0.01 percent, less than or equal to 0.02 percent of N, and the balance of Fe and non-removable impurities;
further, the preparation process of the alloy spring steel strip in the step (1) comprises the following steps: electric furnace smelting → refining → square billet continuous casting → surface full peeling treatment → heating furnace heating → high-speed wire rolling mill rolling → stelmor controlled cooling line cooling → alloy spring steel strip.
Further, the low-temperature quenching process in the step (2) comprises the following steps: firstly, preparing a quenching solution, and proportioning quenching liquid and liquid water in a quenching bath according to the mass fraction of 2:7, wherein the temperature of the quenching solution is 20-40 ℃; arranging a stirring device in the quenching bath, wherein the stirring device stirs the quenching solution to enable the flow velocity of the quenching solution to be 0.3-0.8 m/s; and then placing the workpiece into a quenching bath for quenching, wherein the quenching time is 30-45min, and the quenching is finished after a steam film stage, a boiling stage and a convection stage.
Further, the quenching liquid comprises the following components in percentage by mass: 0.7 to 0.8 percent of antioxidant, 1.5 to 3.0 percent of antirust agent, 0.1 to 0.2 percent of preservative, 0.2 to 0.25 percent of defoaming agent and the balance of methoxy polyethylene glycol.
Further, the polymerization degree n of the methoxy polyethylene glycol is 3-5; the antioxidant is tea polyphenol or ascorbic acid; the components of the antirust agent comprise triethanolamine and triethanolamine borate; the defoaming agent is methyl silicone oil.
Furthermore, the tensile strength of the obtained alloy spring steel strip is 1900-2100MPa, the yield strength is 1700-1900MPa, the elongation after fracture is 9-11%, and the reduction of area is 35-40%.
Further, the refining comprises LF refining and/or VD refining.
The technical scheme shows that the invention has the following beneficial effects: according to the high-strength antirust alloy spring steel wire, the adopted alloy spring steel strip is improved on the basis of silicon-manganese spring steel, elements Zr, B, V and Nb are added, a boron-zirconium compound solid solution compound and VC and NbC fine compounds are formed in a crystal phase, and the strength of the steel is obviously improved; and the defects of strength and plasticity and the antirust performance are further provided through a heat treatment process, so that the obtained alloy spring steel strip has the tensile strength of 1900-2100MPa, the yield strength of 1700-1900MPa, the elongation after fracture of 9-11% and the reduction of area of 35-40%.
Detailed Description
The invention will now be further illustrated by reference to the following specific examples.
Example 1
A preparation process of a high-strength antirust alloy spring steel wire comprises the following steps:
(1) austenitizing treatment: putting the alloy spring steel strip into a fluid graphite particle electric furnace, heating to 900 ℃, and preserving heat for 12 min; austenitizing the internal structure of the steel strip at the temperature;
(2) quenching: then carrying out isothermal quenching within the martensite transformation temperature range of the alloy spring steel strip, wherein the isothermal quenching temperature is 210 ℃, and the heat preservation time is 1.5 min; and (2) austenite formed in the steel strip after the treatment in the step (1) is gradually transformed into martensite, and the hardness, the wear resistance, the toughness and the elasticity of the steel strip are improved.
(3) Carrying out low-temperature quenching on the alloy spring steel strip processed in the step 2; incomplete martensite inside the steel strip tends to be complete, and the mechanical property of the steel is improved.
(4) Heat-preserving and heat-treating at 430 ℃ for 3 h; at the temperature, the internal stress formed in the quenching process can be eliminated, and the internal defects of the steel can be eliminated; further improving the toughness and having good comprehensive mechanical property.
(5) Cooling the alloy spring steel strip obtained in the step (4) to room temperature by water; this can further improve the hardenability of the steel strip.
(6) And (3) cold-rolling the alloy spring steel strip in a spring steel wire cold-drawing mode to form the alloy spring steel strip.
The alloy spring steel strip comprises the following chemical components in percentage by weight: preferably, C: 0.64%, Si: 1.95%, Mn: 0.89%, Cr: 0.30%, Nb: 0.020%, Zr: 0.52%, V: 0.028%, B: 0.004%, P: less than or equal to 0.01 percent, S: less than or equal to 0.01 percent, O: less than or equal to 0.01 percent, less than or equal to 0.02 percent of N, and the balance of Fe and non-removable impurities;
the preparation process of the alloy spring steel strip in the step (1) comprises the following steps: electric furnace smelting → refining → square billet continuous casting → surface full peeling treatment → heating furnace heating → high-speed wire rolling mill rolling → stelmor controlled cooling line cooling → alloy spring steel strip. The refining comprises LF refining and/or VD refining.
Wherein, the process of the low-temperature quenching in the step (2) comprises the following steps: firstly, preparing a quenching solution, and proportioning quenching liquid and liquid water in a quenching bath according to the mass fraction of 2:7, wherein the temperature of the quenching solution is 20 ℃; arranging a stirring device in the quenching bath, wherein the stirring device stirs the quenching solution to enable the flow velocity of the quenching solution to be 0.5 m/s; and then placing the workpiece into a quenching bath for quenching, wherein the quenching time is 30min, and the quenching is finished after a steam film stage, a boiling stage and a convection stage. The quenching liquid comprises the following components in percentage by mass: 0.8% of antioxidant, 3.0% of antirust agent, 0.2% of preservative, 0.25% of defoaming agent and the balance of methoxy polyethylene glycol. And the polymerization degree n of the methoxy polyethylene glycol is 3-5; the antioxidant is tea polyphenols or ascorbic acid; the rust inhibitor comprises triethanolamine and triethanolamine borate; the defoaming agent is methyl silicone oil.
The alloy spring steel strip obtained in this example had a tensile strength of 2030MPa, a yield strength of 1860MPa, a post-fracture elongation of 10.1%, and a reduction of area of 37%. The quenching hardness is more than or equal to 58HRC, the quenching structure is more than 85 percent of martensite, no ferrite structure is formed, no quenching cracking is caused, and the through quenching thickness is not less than 25 mm.
Example 2
A preparation process of a high-strength antirust alloy spring steel wire comprises the following steps:
(1) austenitizing treatment: putting the alloy spring steel strip into a fluidized graphite particle electric furnace, heating to 860 ℃ and preserving heat for 15 min; austenitizing the internal structure of the steel strip at the temperature;
(2) quenching: then carrying out isothermal quenching within the martensite transformation temperature range of the alloy spring steel strip, wherein the isothermal quenching temperature is 220 ℃, and the heat preservation time is 1 min; and (2) austenite formed in the steel strip after the treatment in the step (1) is gradually transformed into martensite, and the hardness, the wear resistance, the toughness and the elasticity of the steel strip are improved.
(3) Carrying out low-temperature quenching on the alloy spring steel strip processed in the step 2; incomplete martensite inside the steel strip tends to be complete, and the mechanical property of the steel is improved.
(4) Heat-preserving and heat-treating at 460 ℃ for 2 h; at the temperature, the internal stress formed in the quenching process can be eliminated, and the internal defects of the steel can be eliminated; further improving the toughness and having good comprehensive mechanical property.
(5) Cooling the alloy spring steel strip obtained in the step (4) to room temperature by water; this can further improve the hardenability of the steel strip.
(6) And (3) cold-rolling the alloy spring steel strip in a spring steel wire cold-drawing mode to form the alloy spring steel strip.
The alloy spring steel strip comprises the following chemical components in percentage by weight: c: 0.51%, Si: 1.78%, Mn: 0.82%, Cr: 0.35%, Nb: 0.050%, Zr: 1.20%, V: 0.048%, B: 0.003%, P: less than or equal to 0.01 percent, S: less than or equal to 0.01 percent, O: less than or equal to 0.01 percent, less than or equal to 0.02 percent of N, and the balance of Fe and non-removable impurities;
the preparation process of the alloy spring steel strip in the step (1) comprises the following steps: electric furnace smelting → refining → square billet continuous casting → surface full peeling treatment → heating furnace heating → high-speed wire rolling mill rolling → stelmor controlled cooling line cooling → alloy spring steel strip. The refining comprises LF refining and/or VD refining.
Wherein, the process of the low-temperature quenching in the step (2) comprises the following steps: firstly, preparing a quenching solution, and proportioning quenching liquid and liquid water in a quenching bath according to the mass fraction of 2:7, wherein the temperature of the quenching solution is 35 ℃; arranging a stirring device in the quenching bath, wherein the stirring device stirs the quenching solution to enable the flow velocity of the quenching solution to be 0.8 m/s; and then placing the workpiece into a quenching bath for quenching, wherein the quenching time is 40min, and the quenching is finished after a steam film stage, a boiling stage and a convection stage. The quenching liquid comprises the following components in percentage by mass: 0.7% of antioxidant, 2.5% of antirust agent, 0.1% of preservative, 0.2% of defoaming agent and the balance of methoxy polyethylene glycol. And the polymerization degree n of the methoxy polyethylene glycol is 3-5; the antioxidant is tea polyphenols or ascorbic acid; the rust inhibitor comprises triethanolamine and triethanolamine borate; the defoaming agent is methyl silicone oil.
The tensile strength of the alloy spring steel strip obtained in the embodiment is 1980MPa, the yield strength is 1730MPa, the elongation after fracture is 9%, and the reduction of area is 36%. The quenching hardness is more than or equal to 58HRC, the quenching structure is more than 85 percent of martensite, no ferrite structure is formed, no quenching cracking is caused, and the through quenching thickness is not less than 25 mm.
Example 3
A preparation process of a high-strength antirust alloy spring steel wire comprises the following steps:
(1) austenitizing treatment: putting the alloy spring steel strip into a fluidized graphite particle electric furnace, heating to 880 ℃, and preserving heat for 10 min; austenitizing the internal structure of the steel strip at the temperature;
(2) quenching: then carrying out isothermal quenching within the martensite transformation temperature range of the alloy spring steel strip, wherein the isothermal quenching temperature is 215 ℃, and the heat preservation time is 1 min; and (2) austenite formed in the steel strip after the treatment in the step (1) is gradually transformed into martensite, and the hardness, the wear resistance, the toughness and the elasticity of the steel strip are improved.
(3) Carrying out low-temperature quenching on the alloy spring steel strip processed in the step 2; incomplete martensite inside the steel strip tends to be complete, and the mechanical property of the steel is improved.
(4) Heat-preserving and heat-treating at 440 ℃ for 2.5 h; at the temperature, the internal stress formed in the quenching process can be eliminated, and the internal defects of the steel can be eliminated; further improving the toughness and having good comprehensive mechanical property.
(5) Cooling the alloy spring steel strip obtained in the step (4) to room temperature by water; this can further improve the hardenability of the steel strip.
(6) And (3) cold-rolling the alloy spring steel strip in a spring steel wire cold-drawing mode to form the alloy spring steel strip.
The alloy spring steel strip comprises the following chemical components in percentage by weight: c: 0.51%, Si: 1.78%, Mn: 0.82%, Cr: 0.35%, Nb: 0.050%, Zr: 1.20%, V: 0.048%, B: 0.003%, P: less than or equal to 0.01 percent, S: less than or equal to 0.01 percent, O: less than or equal to 0.01 percent, less than or equal to 0.02 percent of N, and the balance of Fe and non-removable impurities;
the preparation process of the alloy spring steel strip in the step (1) comprises the following steps: electric furnace smelting → refining → square billet continuous casting → surface full peeling treatment → heating furnace heating → high-speed wire rolling mill rolling → stelmor controlled cooling line cooling → alloy spring steel strip. The refining comprises LF refining and/or VD refining.
Wherein, the process of the low-temperature quenching in the step (2) comprises the following steps: firstly, preparing a quenching solution, and proportioning quenching liquid and liquid water in a quenching bath according to the mass fraction of 2:7, wherein the temperature of the quenching solution is 30 ℃; arranging a stirring device in the quenching bath, wherein the stirring device stirs the quenching solution to enable the flow velocity of the quenching solution to be 0.3 m/s; and then placing the workpiece into a quenching bath for quenching, wherein the quenching time is 45min, and the quenching is finished after a steam film stage, a boiling stage and a convection stage. The quenching liquid comprises the following components in percentage by mass: 0.75% of antioxidant, 2.0% of antirust agent, 0.1% of preservative, 0.25% of defoaming agent and the balance of methoxy polyethylene glycol. And the polymerization degree n of the methoxy polyethylene glycol is 3-5; the antioxidant is tea polyphenols or ascorbic acid; the rust inhibitor comprises triethanolamine and triethanolamine borate; the defoaming agent is methyl silicone oil.
The alloy spring steel strip obtained in this example had a tensile strength of 2100MPa, a yield strength of 1896MPa, a post-fracture elongation of 10.9%, and a reduction of area of 38%. The quenching hardness is more than or equal to 58HRC, the quenching structure is more than 85 percent of martensite, no ferrite structure is formed, no quenching cracking is caused, and the through quenching thickness is not less than 25 mm.
Example 4
A preparation process of a high-strength antirust alloy spring steel wire comprises the following steps:
(1) austenitizing treatment: putting the alloy spring steel strip into a fluid graphite particle electric furnace, heating to 900 ℃, and preserving heat for 15 min; austenitizing the internal structure of the steel strip at the temperature;
(2) quenching: then carrying out isothermal quenching within the martensite transformation temperature range of the alloy spring steel strip, wherein the isothermal quenching temperature is 215 ℃, and the heat preservation time is 1.5 min; and (2) austenite formed in the steel strip after the treatment in the step (1) is gradually transformed into martensite, and the hardness, the wear resistance, the toughness and the elasticity of the steel strip are improved.
(3) Carrying out low-temperature quenching on the alloy spring steel strip processed in the step 2; incomplete martensite inside the steel strip tends to be complete, and the mechanical property of the steel is improved.
(4) Heat-preserving and heat-treating at 460 ℃ for 3 h; at the temperature, the internal stress formed in the quenching process can be eliminated, and the internal defects of the steel can be eliminated; further improving the toughness and having good comprehensive mechanical property.
(5) Cooling the alloy spring steel strip obtained in the step (4) to room temperature by water; this can further improve the hardenability of the steel strip.
(6) And (3) cold-rolling the alloy spring steel strip in a spring steel wire cold-drawing mode to form the alloy spring steel strip.
The alloy spring steel strip comprises the following chemical components in percentage by weight: c: 0.51%, Si: 1.95%, Mn: 0.89%, Cr: 0.25%, Nb: 0.050%, Zr: 0.96%, V: 0.045%, B: 0.003%, P: less than or equal to 0.01 percent, S: less than or equal to 0.01 percent, O: less than or equal to 0.01 percent, less than or equal to 0.02 percent of N, and the balance of Fe and non-removable impurities;
the preparation process of the alloy spring steel strip in the step (1) comprises the following steps: electric furnace smelting → refining → square billet continuous casting → surface full peeling treatment → heating furnace heating → high-speed wire rolling mill rolling → stelmor controlled cooling line cooling → alloy spring steel strip. The refining comprises LF refining and/or VD refining.
Wherein, the process of the low-temperature quenching in the step (2) comprises the following steps: firstly, preparing a quenching solution, and proportioning quenching liquid and liquid water in a quenching bath according to the mass fraction of 2:7, wherein the temperature of the quenching solution is 30 ℃; arranging a stirring device in the quenching bath, wherein the stirring device stirs the quenching solution to enable the flow velocity of the quenching solution to be 0.3 m/s; and then placing the workpiece into a quenching bath for quenching, wherein the quenching time is 45min, and the quenching is finished after a steam film stage, a boiling stage and a convection stage. The quenching liquid comprises the following components in percentage by mass: 0.75% of antioxidant, 1.5% of antirust agent, 0.12% of preservative, 0.22% of defoaming agent and the balance of methoxy polyethylene glycol. And the polymerization degree n of the methoxy polyethylene glycol is 3-5; the antioxidant is tea polyphenols or ascorbic acid; the rust inhibitor comprises triethanolamine and triethanolamine borate; the defoaming agent is methyl silicone oil.
The tensile strength of the alloy spring steel strip obtained in the embodiment is 1910MPa, the yield strength is 1706MPa, the elongation after fracture is 9.1%, and the reduction of area is 36%. The quenching hardness is more than or equal to 58HRC, the quenching structure is more than 85 percent of martensite, no ferrite structure is formed, no quenching cracking is caused, and the through quenching thickness is not less than 25 mm.
Comparative example 1
A preparation process of a high-strength antirust alloy spring steel wire comprises the following steps:
(1) austenitizing treatment: putting the alloy spring steel strip into a fluid graphite particle electric furnace, heating to 900 ℃, and preserving heat for 12 min; austenitizing the internal structure of the steel strip at the temperature;
(2) quenching: carrying out low-temperature quenching on the alloy spring steel strip treated in the step 1; incomplete martensite inside the steel strip tends to be complete, and the mechanical property of the steel is improved.
(4) Heat-preserving and heat-treating at 430 ℃ for 3 h; at the temperature, the internal stress formed in the quenching process can be eliminated, and the internal defects of the steel can be eliminated; further improving the toughness and having good comprehensive mechanical property.
(5) Cooling the alloy spring steel strip obtained in the step (4) to room temperature by water; this can further improve the hardenability of the steel strip.
(6) And (3) cold-rolling the alloy spring steel strip in a spring steel wire cold-drawing mode to form the alloy spring steel strip.
The alloy spring steel strip comprises the following chemical components in percentage by weight: preferably, C: 0.64%, Si: 1.95%, Mn: 0.89%, Cr: 0.30%, Nb: 0.020%, Zr: 0.52%, V: 0.028%, B: 0.004%, P: less than or equal to 0.01 percent, S: less than or equal to 0.01 percent, O: less than or equal to 0.01 percent, less than or equal to 0.02 percent of N, and the balance of Fe and non-removable impurities;
the preparation process of the alloy spring steel strip in the step (1) comprises the following steps: electric furnace smelting → refining → square billet continuous casting → surface full peeling treatment → heating furnace heating → high-speed wire rolling mill rolling → stelmor controlled cooling line cooling → alloy spring steel strip. The refining comprises LF refining and/or VD refining.
Wherein, the process of the low-temperature quenching in the step (2) comprises the following steps: firstly, preparing a quenching solution, and proportioning quenching liquid and liquid water in a quenching bath according to the mass fraction of 2:7, wherein the temperature of the quenching solution is 20 ℃; arranging a stirring device in the quenching bath, wherein the stirring device stirs the quenching solution to enable the flow velocity of the quenching solution to be 0.5 m/s; and then placing the workpiece into a quenching bath for quenching, wherein the quenching time is 30min, and the quenching is finished after a steam film stage, a boiling stage and a convection stage. The quenching liquid comprises the following components in percentage by mass: 0.8% of antioxidant, 3.0% of antirust agent, 0.2% of preservative, 0.25% of defoaming agent and the balance of methoxy polyethylene glycol. And the polymerization degree n of the methoxy polyethylene glycol is 3-5; the antioxidant is tea polyphenols or ascorbic acid; the rust inhibitor comprises triethanolamine and triethanolamine borate; the defoaming agent is methyl silicone oil.
The alloy spring steel strip obtained in this example had a tensile strength of 1760MPa, a yield strength of 1530MPa, an elongation after fracture of 6.2%, and a reduction of area of 29%. The quenching hardness is more than or equal to 54HRC, the quenching structure is more than 85 percent of martensite, no ferrite structure is formed, no quenching cracking is caused, and the through quenching thickness is not less than 20 mm.
Comparative example 2
A preparation process of a high-strength antirust alloy spring steel wire comprises the following steps:
(1) austenitizing treatment: putting the alloy spring steel strip into a fluid graphite particle electric furnace, heating to 900 ℃, and preserving heat for 12 min; austenitizing the internal structure of the steel strip at the temperature;
(2) quenching: carrying out low-temperature quenching on the alloy spring steel strip treated in the step 1; incomplete martensite inside the steel strip tends to be complete, and the mechanical property of the steel is improved.
(4) Heat-preserving and heat-treating at 430 ℃ for 3 h; at the temperature, the internal stress formed in the quenching process can be eliminated, and the internal defects of the steel can be eliminated; further improving the toughness and having good comprehensive mechanical property.
(5) Cooling the alloy spring steel strip obtained in the step (4) to room temperature by water; this can further improve the hardenability of the steel strip.
(6) And (3) cold-rolling the alloy spring steel strip in a spring steel wire cold-drawing mode to form the alloy spring steel strip.
The alloy spring steel strip comprises the following chemical components in percentage by weight: preferably, C: 0.64%, Si: 1.95%, Mn: 0.89%, Cr: 0.30%, V: 0.028%, B: 0.002%, P: less than or equal to 0.03%, S: less than or equal to 0.03%, O: less than or equal to 0.01 percent, less than or equal to 0.02 percent of N, and the balance of Fe and non-removable impurities;
the preparation process of the alloy spring steel strip in the step (1) comprises the following steps: electric furnace smelting → refining → square billet continuous casting → surface full peeling treatment → heating furnace heating → high-speed wire rolling mill rolling → stelmor controlled cooling line cooling → alloy spring steel strip. The refining comprises LF refining and/or VD refining.
Wherein, the process of the low-temperature quenching in the step (2) comprises the following steps: firstly, preparing a quenching solution, and proportioning quenching liquid and liquid water in a quenching bath according to the mass fraction of 2:7, wherein the temperature of the quenching solution is 20 ℃; arranging a stirring device in the quenching bath, wherein the stirring device stirs the quenching solution to enable the flow velocity of the quenching solution to be 0.5 m/s; and then placing the workpiece into a quenching bath for quenching, wherein the quenching time is 30min, and the quenching is finished after a steam film stage, a boiling stage and a convection stage. The quenching liquid comprises the following components in percentage by mass: 0.8% of antioxidant, 3.0% of antirust agent, 0.2% of preservative, 0.25% of defoaming agent and the balance of methoxy polyethylene glycol. And the polymerization degree n of the methoxy polyethylene glycol is 3-5; the antioxidant is tea polyphenols or ascorbic acid; the rust inhibitor comprises triethanolamine and triethanolamine borate; the defoaming agent is methyl silicone oil.
The alloy spring steel strip obtained in this example had a tensile strength of 1560MPa, a yield strength of 1310MPa, an elongation after fracture of 4.1% and a reduction of area of 21%. The quenching hardness is more than or equal to 54HRC, the quenching structure is more than 85 percent of martensite, no ferrite structure is formed, no quenching cracking is caused, and the through quenching thickness is not less than 20 mm.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (9)
1. The utility model provides a rust-resistant alloy spring steel wire of high strength which characterized in that: the preparation process of the alloy spring steel wire comprises the following steps: 1) austenitizing treatment: placing the alloy spring steel strip into a fluid graphite particle electric furnace, heating to 850-; 2) quenching: then carrying out isothermal quenching within the martensite transformation temperature range of the alloy spring steel strip, wherein the isothermal quenching temperature is 210-220 ℃, and the heat preservation time is 1-2 min; 3) carrying out low-temperature quenching on the alloy spring steel strip processed in the step 2; 4) heat treatment is carried out for 2-3h at the temperature of 420-; 5) cooling the alloy spring steel strip obtained in the step (3) to room temperature by water; 6) and (3) cold-rolling the alloy spring steel strip in a spring steel wire cold-drawing mode to form the alloy spring steel strip.
2. The high-strength rust-preventive alloy spring steel wire according to claim 1, characterized in that: the alloy spring steel strip in the step (1) comprises the following chemical components in percentage by weight: c: 0.56-0.64%, Si: 1.65-1.95%, Mn: 0.61-0.89%, Cr: 0.22-0.35%, Nb: 0.020 to 0.050%, Zr: 0.03-1.20%, V: 0.028-0.048%, B: 0.002-0.004%, P: less than or equal to 0.01 percent, S: less than or equal to 0.01 percent, O: less than or equal to 0.01 percent, less than or equal to 0.02 percent of N, and the balance of Fe and unremovable impurities.
3. The high-strength rust-preventive alloy spring steel wire according to claim 2, characterized in that: the alloy spring steel strip in the step (1) comprises the following chemical components in percentage by weight: c: 0.64%, Si: 1.95%, Mn: 0.89%, Cr: 0.30%, Nb: 0.020%, Zr: 0.52%, V: 0.028%, B: 0.004%, P: less than or equal to 0.01 percent, S: less than or equal to 0.01 percent, O: less than or equal to 0.01 percent, less than or equal to 0.02 percent of N, and the balance of Fe and non-removable impurities;
or, the alloy spring steel strip in the step (1) is prepared from the following chemical components in percentage by weight: c: 0.51%, Si: 1.78%, Mn: 0.82%, Cr: 0.35%, Nb: 0.050%, Zr: 1.20%, V: 0.048%, B: 0.003%, P: less than or equal to 0.01 percent, S: less than or equal to 0.01 percent, O: less than or equal to 0.01 percent, less than or equal to 0.02 percent of N, and the balance of Fe and non-removable impurities;
or, the alloy spring steel strip in the step (1) is prepared from the following chemical components in percentage by weight: c: 0.57%, Si: 1.65%, Mn: 0.65%, Cr: 0.22%, Nb: 0.04%, Zr: 0.23%, V: 0.036%, B: 0.002%, P: less than or equal to 0.01 percent, S: less than or equal to 0.01 percent, O: less than or equal to 0.01 percent, less than or equal to 0.02 percent of N, and the balance of Fe and unremovable impurities.
4. The high-strength rust-preventive alloy spring steel wire according to claim 2, characterized in that: the preparation process of the alloy spring steel strip in the step (1) comprises the following steps: electric furnace smelting → refining → square billet continuous casting → surface full peeling treatment → heating furnace heating → high-speed wire rolling mill rolling → stelmor controlled cooling line cooling → alloy spring steel strip.
5. The high-strength rust-preventive alloy spring steel wire according to claim 1, characterized in that: the low-temperature quenching process in the step (2) comprises the following steps: firstly, preparing a quenching solution, and mixing the quenching solution and liquid water in a quenching bath according to the mass fraction of 2:8-3: 7, wherein the temperature of the quenching solution is 20-40 ℃; arranging a stirring device in the quenching bath, wherein the stirring device stirs the quenching solution to enable the flow velocity of the quenching solution to be 0.3-0.8 m/s; and then placing the workpiece into a quenching bath for quenching, wherein the quenching time is 30-45min, and the quenching is finished after a steam film stage, a boiling stage and a convection stage.
6. The high-strength rust-preventive alloy spring steel wire according to claim 5, characterized in that: the quenching liquid comprises the following components in percentage by mass: 0.7 to 0.8 percent of antioxidant, 1.5 to 3.0 percent of antirust agent, 0.1 to 0.2 percent of preservative, 0.2 to 0.25 percent of defoaming agent and the balance of methoxy polyethylene glycol.
7. The high-strength rust-preventive alloy spring steel wire according to claim 5, characterized in that: the polymerization degree n of the methoxy polyethylene glycol is 3-5; the antioxidant is tea polyphenol or ascorbic acid; the components of the antirust agent comprise triethanolamine and triethanolamine borate; the defoaming agent is methyl silicone oil.
8. The high-strength rust-preventive alloy spring steel wire according to claim 1, characterized in that: the tensile strength of the alloy spring steel strip obtained in the step (5) is 1900-2100MPa, the yield strength is 1700-1900MPa, the elongation after fracture is 9% -11%, and the reduction of area is 35% -40%.
9. The high-strength rust-preventive alloy spring steel wire according to claim 4, characterized in that: the refining comprises LF refining and/or VD refining.
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Application publication date: 20211102 |