CN111020125A - Preparation method of high-strength low-temperature-resistant corrosion-resistant fastener - Google Patents
Preparation method of high-strength low-temperature-resistant corrosion-resistant fastener Download PDFInfo
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- CN111020125A CN111020125A CN201911349432.2A CN201911349432A CN111020125A CN 111020125 A CN111020125 A CN 111020125A CN 201911349432 A CN201911349432 A CN 201911349432A CN 111020125 A CN111020125 A CN 111020125A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- 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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- 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
- C23C22/46—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 oxalates
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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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
Abstract
The invention belongs to the technical field of high-performance fastener manufacturing, and particularly relates to a preparation method of a high-strength low-temperature-resistant corrosion-resistant fastener, which comprises the following steps: cold-drawing or cold-rolling the raw material of the fastener to obtain a fastener wire blank; heat treating the obtained fastener wire blank: firstly, carburizing a fastener wire blank in a heating furnace; then taking out the wire blank from the furnace, and immediately putting the wire blank of the fastener into a quenching oil tank for quenching treatment; finally, tempering the fastener wire blank; taking out the fastener wire blank and naturally cooling the fastener wire blank; immersing the obtained fastener wire blank into an oxalic acid solution at the temperature of 60-70 ℃, and preserving heat for 20-30 min to form an oxalate film on the surface of the fastener wire blank; and (3) carrying out thread processing on the fastener wire blank to obtain the high-strength corrosion-resistant low-temperature-resistant fastener with the upper limit of tensile strength of 1000 MPa and the performance grade of 9.8.9-10.9.
Description
Technical Field
The invention belongs to the technical field of high-performance fastener manufacturing, and particularly relates to a preparation method of a high-strength low-temperature-resistant corrosion-resistant fastener.
Background
Fasteners are the most widely used mechanical base elements, and a wide variety of fasteners are found on a variety of machines, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemicals, instruments, supplies, and the like. In some special operating environments, the performance requirements of the fastener have special requirements, such as environments with low temperature and corrosive liquids, and the fastener is required to have corrosion resistance, high and low temperature resistance and high strength performance on the basis of ensuring the mechanical performance.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a preparation method of a high-strength low-temperature-resistant corrosion-resistant fastener.
The technical scheme adopted by the invention is as follows: the invention provides a preparation method of a high-strength low-temperature-resistant corrosion-resistant fastener, which comprises the following steps:
(a) cold drawing or cold rolling the raw material of the fastener, and performing cold deformation on the raw material of the fastener with the surface reduction rate of over 60 percent to obtain a fastener wire blank;
(b) and (b) carrying out heat treatment on the fastener wire blank obtained in the step (a), so that crystal grains in the stainless steel wire are converted to form crystal grains with uniform sizes, and the wire is good in overall plasticity, beneficial to later-stage processing deformation and capable of improving the toughness and ductility of the wire. Specifically, the method comprises the following steps: firstly, carburizing a fastener wire blank in a heating furnace; taking out the wire blank from the furnace, immediately putting the wire blank of the fastener into a quenching oil tank for quenching treatment, wherein the temperature of quenching oil is between 60 and 80 ℃, and circularly stirring the quenching oil; finally, tempering the fastener wire blank; tempering treatment, namely, keeping the temperature at 500-560 ℃ for 2-3 hours. And taking out the fastener wire blank and naturally cooling the fastener wire blank. The heating furnace is a continuous controlled atmosphere mesh belt furnace.
(c) And c, soaking the fastener wire blank obtained in the step b into an oxalic acid solution at the temperature of 60-70 ℃, and preserving the heat for 20-30 min to form an oxalate film on the surface of the fastener wire blank. The oxalic acid solution comprises the following components in parts by weight: 40g/L oxalic acid, 10g/L ferric sulfate and 5g/L sodium bisulfite. The oxalate film thickness was 5 μm-8 μm. The oxalate film can be used as a lubricating film in the forming process, so that the sticking of the film can be prevented in the forming process, the continuous production can be realized, and the service life of the die can be prolonged.
(d) And c, carrying out thread machining on the fastener wire blank obtained in the step c to obtain the fastener. The thread processing adopts a thread rolling or thread rolling process.
Further, the fastener raw material comprises the following components in percentage by mass: c: 0.1-2%, Si: less than or equal to 3 percent, Mn: less than or equal to 2 percent, S: less than or equal to 0.025%, P: less than or equal to 0.025 percent, Cr: 0.4-1%, Ni: less than or equal to 5%, W: 1-2.7%, Mo: 1% -3%, V: 0.3 to 0.5%, Ti: 0.05-0.15%, Se: less than or equal to 0.1 percent, and the balance of Fe and inevitable impurity elements, wherein the sum of all elements is 100 percent.
Preferably, the raw material of the fastener consists of the following components in percentage by mass: c: 0.1-2%, Si: 1-3%, Mn: 1-2%, S: 0-0.025%, P: 0 to 0.025%, Cr: 0.4-1%, Ni: 2-5%, W: 1-2.7%, Mo: 1% -3%, V: 0.3 to 0.5%, Ti: 0.05-0.15%, Se: 0 to 0.1 percent, and the balance of Fe and inevitable impurity elements, wherein the sum of all elements is 100 percent.
And further, in the step b, the carburization treatment is to send the fastener into a heating furnace, the fastener sequentially enters a zone I and a zone IV, the heating temperature from the zone I to the zone IV is controlled to be 950-1050 ℃, methanol is introduced, the introduction amount is 20-40 mL/min, propane is introduced, the carbon potential is controlled to be 0.40% +/-0.04%, and the fastener wire blank is subjected to heat preservation in the heating furnace for 0.5-1 hour.
Further, in the step b, the quenching treatment is to put the fastener into a quenching tank for quenching treatment, wherein the temperature of quenching oil is between 60 and 80 ℃, and the quenching oil is circularly stirred; the quenching oil is high-speed quenching oil.
The invention has the beneficial effects that:
(1) the high-strength corrosion-resistant low-temperature-resistant fastener with the upper limit of tensile strength of 1000 MPa and the performance grade of 9.8.9-10.9 is obtained;
(2) the raw materials of the fastener disclosed by the invention contain Si, and the formed crystalline phase can effectively improve the corrosion resistance, so that the fastener has the advantages of high strength, good heat resistance, good wear resistance and good corrosion resistance;
(3) before the forming processing technology of the fastener, a layer of oxalic acid film is formed on the surface of the fastener wire blank to be used as a lubricating film, so that the sticking of the film can be prevented in the forming processing process, the continuous production is realized, and the service life of a die is prolonged;
(4) the heat treatment process of the invention enables the crystal grains in the stainless steel wire to be transformed to form crystal grains with uniform sizes, thereby leading the wire to have good overall plasticity, being beneficial to later-stage processing deformation and being capable of improving the toughness and the ductility of the wire.
Detailed Description
The invention will be further elucidated by means of several specific examples, which are intended to be illustrative only and not limiting.
Example 1:
a preparation method of a high-strength low-temperature-resistant corrosion-resistant fastener comprises the following steps:
(a) cold drawing or cold rolling the raw material of the fastener, and performing cold deformation on the raw material of the fastener with the surface reduction rate of over 60 percent to obtain a fastener wire blank;
(b) and (b) carrying out heat treatment on the fastener wire blank obtained in the step (a), so that crystal grains in the stainless steel wire are converted to form crystal grains with uniform sizes, and the wire is good in overall plasticity, beneficial to later-stage processing deformation and capable of improving the toughness and ductility of the wire. Specifically, the method comprises the following steps: firstly, carburizing a fastener wire blank in a heating furnace; then taking out the wire blank from the furnace, immediately putting the wire blank of the fastener into a quenching oil tank for quenching treatment, and circularly stirring quenching oil when the temperature of the quenching oil is between 60 ℃; finally, tempering the fastener wire blank; tempering treatment, namely keeping the temperature at 500 ℃ for 3 hours. And taking out the fastener wire blank and naturally cooling the fastener wire blank. The heating furnace is a continuous controlled atmosphere mesh belt furnace.
(c) And c, soaking the fastener wire blank obtained in the step b into an oxalic acid solution at the temperature of 60 ℃, and preserving the heat for 20min to form an oxalate film on the surface of the fastener wire blank. The oxalic acid solution comprises the following components in parts by weight: 40g/L oxalic acid, 10g/L ferric sulfate and 5g/L sodium bisulfite. The thickness of the oxalate film was 5 μm-. The oxalate film can be used as a lubricating film in the forming process, so that the sticking of the film can be prevented in the forming process, the continuous production can be realized, and the service life of the die can be prolonged.
(d) And c, carrying out thread machining on the fastener wire blank obtained in the step c to obtain the fastener. The thread processing adopts a thread rolling or thread rolling process.
Further, the fastener raw material comprises the following components in percentage by mass: c: 2%, Si: 3%, Mn: 2%, S: 0.005%, P: 0.005%, Cr: 0.8%, Ni: 3%, W: 1.8%, Mo: 1%, V: 0.3%, Ti: 0.15%, Se: 0.05%, the balance being Fe and unavoidable impurity elements, the sum of the elements being 100%.
And further, in the step b, the carburization treatment is to send the fastener into a heating furnace, the fastener sequentially enters a zone I and a zone IV, the heating temperature from the zone I to the zone IV is controlled to be 950 ℃, methanol is introduced, the introduction amount is 20mL/min, propane is introduced, the carbon potential is controlled to be 0.40% +/-0.04%, and the fastener wire blank is subjected to heat preservation in the heating furnace for 1 hour.
Example 2:
a preparation method of a high-strength low-temperature-resistant corrosion-resistant fastener comprises the following steps:
(a) cold drawing or cold rolling the raw material of the fastener, and performing cold deformation on the raw material of the fastener with the surface reduction rate of over 60 percent to obtain a fastener wire blank;
(b) and (b) carrying out heat treatment on the fastener wire blank obtained in the step (a), so that crystal grains in the stainless steel wire are converted to form crystal grains with uniform sizes, and the wire is good in overall plasticity, beneficial to later-stage processing deformation and capable of improving the toughness and ductility of the wire. Specifically, the method comprises the following steps: firstly, carburizing a fastener wire blank in a heating furnace; then taking out the wire blank from the furnace, immediately putting the wire blank of the fastener into a quenching oil tank for quenching treatment, and circularly stirring quenching oil when the temperature of the quenching oil is between 70 ℃; finally, tempering the fastener wire blank; tempering treatment, namely keeping the temperature at 520 ℃ for 2.5 hours. And taking out the fastener wire blank and naturally cooling the fastener wire blank. The heating furnace is a continuous controlled atmosphere mesh belt furnace.
(c) And c, soaking the fastener wire blank obtained in the step b into an oxalic acid solution at the temperature of 60 ℃, and preserving the temperature for 30 minutes to form an oxalate film on the surface of the fastener wire blank. The oxalic acid solution comprises the following components in parts by weight: 40g/L oxalic acid, 10g/L ferric sulfate and 5g/L sodium bisulfite. The oxalate film had a thickness of 6 μm. The oxalate film can be used as a lubricating film in the forming process, so that the sticking of the film can be prevented in the forming process, the continuous production can be realized, and the service life of the die can be prolonged.
(d) And c, carrying out thread machining on the fastener wire blank obtained in the step c to obtain the fastener. The thread processing adopts a thread rolling or thread rolling process.
Further, the fastener raw material comprises the following components in percentage by mass: c: 1%, Si: 1%, Mn: 2%, S: 0.005%, P: 0.001%, Cr: 1%, Ni: 3%, W: 2%, Mo: 2%, V: 0.5%, Ti: 0.1%, Se: 0.01%, and the balance of Fe and inevitable impurity elements, the sum of the elements being 100%.
Further, in the step b, the carburization treatment is to send the fastener into a heating furnace, the fastener sequentially enters a region I and a region IV, the heating temperature from the region I to the region IV is controlled at 1000 ℃, methanol is introduced, the introduction amount is 28mL/min, propane is introduced, the carbon potential is controlled at 0.40% +/-0.04%, and the fastener wire blank is subjected to heat preservation in the heating furnace for 30 minutes.
Example 3:
a preparation method of a high-strength low-temperature-resistant corrosion-resistant fastener comprises the following steps:
(a) cold drawing or cold rolling the raw material of the fastener, and performing cold deformation on the raw material of the fastener with the surface reduction rate of over 60 percent to obtain a fastener wire blank;
(b) and (b) carrying out heat treatment on the fastener wire blank obtained in the step (a), so that crystal grains in the stainless steel wire are converted to form crystal grains with uniform sizes, and the wire is good in overall plasticity, beneficial to later-stage processing deformation and capable of improving the toughness and ductility of the wire. Specifically, the method comprises the following steps: firstly, carburizing a fastener wire blank in a heating furnace; then taking out the wire blank from the furnace, immediately putting the wire blank of the fastener into a quenching oil tank for quenching treatment, and circularly stirring quenching oil when the temperature of the quenching oil is between 70 ℃; finally, tempering the fastener wire blank; tempering treatment, namely keeping the temperature at 520 ℃ for 2.5 hours. And taking out the fastener wire blank and naturally cooling the fastener wire blank. The heating furnace is a continuous controlled atmosphere mesh belt furnace.
(c) And c, soaking the fastener wire blank obtained in the step b into an oxalic acid solution at the temperature of 80 ℃, and preserving the temperature for 30 minutes to form an oxalate film on the surface of the fastener wire blank. The oxalic acid solution comprises the following components in parts by weight: 40g/L oxalic acid, 10g/L ferric sulfate and 5g/L sodium bisulfite. The oxalate film had a thickness of 7 μm. The oxalate film can be used as a lubricating film in the forming process, so that the sticking of the film can be prevented in the forming process, the continuous production can be realized, and the service life of the die can be prolonged.
(d) And c, carrying out thread machining on the fastener wire blank obtained in the step c to obtain the fastener. The thread processing adopts a thread rolling or thread rolling process.
Further, the fastener raw material comprises the following components in percentage by mass: c: 2%, Si: 3%, Mn: 1.5%, S: 0.005%, P: 0%, Cr: 0.6%, Ni: 4%, W: 2.7%, Mo: 1%, V: 0.5%, Ti: 0.05%, Se: 0.08%, the balance being Fe and inevitable impurity elements, the sum of the elements being 100%.
Further, in the step b, the carburization treatment is to send the fastener into a heating furnace, the fastener sequentially enters a region I and a region IV, the heating temperature from the region I to the region IV is controlled at 1000 ℃, methanol is introduced, the introduction amount is 28mL/min, propane is introduced, the carbon potential is controlled at 0.40% +/-0.04%, and the fastener wire blank is subjected to heat preservation in the heating furnace for 30 minutes.
Example 4:
a preparation method of a high-strength low-temperature-resistant corrosion-resistant fastener comprises the following steps:
(a) cold drawing or cold rolling the raw material of the fastener, and performing cold deformation on the raw material of the fastener with the surface reduction rate of over 60 percent to obtain a fastener wire blank;
(b) and (b) carrying out heat treatment on the fastener wire blank obtained in the step (a), so that crystal grains in the stainless steel wire are converted to form crystal grains with uniform sizes, and the wire is good in overall plasticity, beneficial to later-stage processing deformation and capable of improving the toughness and ductility of the wire. Specifically, the method comprises the following steps: firstly, carburizing a fastener wire blank in a heating furnace; then taking out the fastener wire blank from the furnace, immediately putting the fastener wire blank into a quenching oil tank for quenching treatment, wherein the temperature of quenching oil is 80 ℃, and circularly stirring the quenching oil; finally, tempering the fastener wire blank; tempering treatment, namely, keeping the temperature at 560 ℃ for 2 hours. And taking out the fastener wire blank and naturally cooling the fastener wire blank. The heating furnace is a continuous controlled atmosphere mesh belt furnace.
(c) And c, soaking the fastener wire blank obtained in the step b into an oxalic acid solution at the temperature of 60 ℃, and preserving the temperature for 30 minutes to form an oxalate film on the surface of the fastener wire blank. The oxalic acid solution comprises the following components in parts by weight: 40g/L oxalic acid, 10g/L ferric sulfate and 5g/L sodium bisulfite. The oxalate film thickness was 8 μm. The oxalate film can be used as a lubricating film in the forming process, so that the sticking of the film can be prevented in the forming process, the continuous production can be realized, and the service life of the die can be prolonged.
(d) And c, carrying out thread machining on the fastener wire blank obtained in the step c to obtain the fastener. The thread processing adopts a thread rolling or thread rolling process.
Further, the fastener raw material comprises the following components in percentage by mass: c: 0.1%, Si: 3%, Mn: 1%, S: 0.025%, P: 0.001%, Cr: 0.4%, Ni: 2%, W: 1%, Mo: 1.3%, V: 0.3%, Ti: 0.15%, Se: 0.1% and the balance of Fe and inevitable impurity elements, the sum of the elements being 100%.
Further, in the step b, the carburization treatment is to send the fastener into a heating furnace, the fastener sequentially enters a zone I and a zone IV, the heating temperature from the zone I to the zone IV is controlled to be 1050 ℃, methanol is introduced, the introduction amount is 32mL/min, propane is introduced, the carbon potential is controlled to be 0.40% +/-0.04%, and the fastener wire blank is subjected to heat preservation in the heating furnace for 40 minutes.
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 (10)
1. A preparation method of a high-strength low-temperature-resistant corrosion-resistant fastener is characterized by comprising the following steps: the method comprises the following steps:
(a) cold drawing or cold rolling the raw material of the fastener, and performing cold deformation on the raw material of the fastener with the surface reduction rate of over 60 percent to obtain a fastener wire blank;
(b) b, performing heat treatment on the fastener wire blank obtained in the step a: firstly, carburizing a fastener wire blank in a heating furnace; then taking out the wire blank from the furnace, and immediately putting the wire blank of the fastener into a quenching oil tank for quenching treatment; finally, tempering the fastener wire blank; taking out the fastener wire blank and naturally cooling the fastener wire blank;
(c) b, soaking the fastener wire blank obtained in the step b into an oxalic acid solution at the temperature of 60-70 ℃, and preserving heat for 20-30 min to form an oxalate film on the surface of the fastener wire blank;
(d) and c, carrying out thread machining on the fastener wire blank obtained in the step c to obtain the fastener.
2. The method for preparing a high-strength low-temperature-resistant corrosion-resistant fastener according to claim 1, wherein the method comprises the following steps: the fastener raw material comprises the following components in percentage by mass: c: 0.1-2%, Si: less than or equal to 3 percent, Mn: less than or equal to 2 percent, S: less than or equal to 0.025%, P: less than or equal to 0.025 percent, Cr: 0.4-1%, Ni: less than or equal to 5%, W: 1-2.7%, Mo: 1% -3%, V: 0.3 to 0.5%, Ti: 0.05-0.15%, Se: less than or equal to 0.1 percent, and the balance of Fe and inevitable impurity elements, wherein the sum of all elements is 100 percent.
3. The method for preparing a high-strength low-temperature-resistant corrosion-resistant fastener according to claim 2, wherein the method comprises the following steps: the fastener raw material comprises the following components in percentage by mass: c: 0.1-2%, Si: 1-3%, Mn: 1-2%, S: 0-0.025%, P: 0 to 0.025%, Cr: 0.4-1%, Ni: 2-5%, W: 1-2.7%, Mo: 1% -3%, V: 0.3 to 0.5%, Ti: 0.05-0.15%, Se: 0 to 0.1 percent, and the balance of Fe and inevitable impurity elements, wherein the sum of all elements is 100 percent.
4. The method for preparing a high-strength low-temperature-resistant corrosion-resistant fastener according to claim 1, wherein the method comprises the following steps: and b, in the carburizing treatment, namely, the fasteners are sent into a heating furnace and sequentially enter a zone I and a zone IV, the heating temperature of the zone I to the zone IV is controlled to be 950-1050 ℃, methanol is introduced, the introduction amount is 20-40 mL/min, propane is introduced, the carbon potential is controlled to be 0.40% +/-0.04%, and the fastener wire blank is subjected to heat preservation in the heating furnace for 0.5-1 hour.
5. The method for preparing a high-strength low-temperature-resistant corrosion-resistant fastener according to claim 1, wherein the method comprises the following steps: in the step b, the quenching treatment is to put the fastener into a quenching tank for quenching treatment, wherein the temperature of quenching oil is 60-80 ℃, and the quenching oil is circularly stirred; the quenching oil is high-speed quenching oil.
6. The method for preparing a high-strength low-temperature-resistant corrosion-resistant fastener according to claim 1, wherein the method comprises the following steps: in the step b, the tempering treatment is to keep the temperature at 500-560 ℃ for 2-3 hours.
7. The method for preparing a high-strength low-temperature-resistant corrosion-resistant fastener according to claim 1, wherein the method comprises the following steps: the oxalic acid solution in the step c comprises the following components in parts by weight: 40g/L oxalic acid, 10g/L ferric sulfate and 5g/L sodium bisulfite.
8. The method for preparing a high-strength low-temperature-resistant corrosion-resistant fastener according to claim 1, wherein the method comprises the following steps: and the thickness of the oxalate film in the step c is 5-8 mu m.
9. The method for preparing a high-strength low-temperature-resistant corrosion-resistant fastener according to claim 1, wherein the method comprises the following steps: and d, adopting a thread rolling or thread rolling process for thread processing.
10. The method for preparing a high-strength low-temperature-resistant corrosion-resistant fastener according to claim 1, wherein the method comprises the following steps: the fastener with the upper limit of tensile strength of 1000 MPa and the performance grade of 9.8.9-10.9 is obtained.
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Address after: No. 189, Xingang Road, Fuqiao Town, Taicang City, Suzhou City, Jiangsu Province Applicant after: SUZHOU TIANDONG FASTENER Co.,Ltd. Address before: No.61 Xinyi West Road, Xintang, Liuhe Town, Taicang City, Suzhou City, Jiangsu Province 215400 Applicant before: SUZHOU TIANDONG FASTENER Co.,Ltd. |
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Application publication date: 20200417 |