CN114790537A - High-performance engineering fastener material and production method thereof - Google Patents
High-performance engineering fastener material and production method thereof Download PDFInfo
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Abstract
The invention discloses a production method of a high-performance engineering fastener material, which comprises the following steps: step S1, preprocessing raw materials of engineering fasteners, step S2, co-infiltration processing, step S3, cleaning, heat treatment, step S4 and processing and forming. The invention also discloses a high-performance engineering fastener material produced by the production method of the high-performance engineering fastener material. The high-performance engineering fastener material disclosed by the invention has the advantages of strong corrosion resistance, good mechanical property, good fatigue resistance, sufficient performance stability and long service life.
Description
Technical Field
The invention relates to the technical field of fastener material preparation, in particular to a high-performance engineering fastener material and a production method thereof.
Background
In recent years, with the development of economy and the promotion of global industrialization process, various important engineering projects are successively introduced, and the success of the important engineering projects inevitably brings new vitality to global economy, brings convenience to the life of people and adds splendid color to modern construction. Behind these major engineering projects, the use of engineering fastener materials is not isolated. Engineering fasteners are mechanical parts used for fastening two or more parts (or components) in the engineering field to form a whole by fastening and connecting the parts (or components), and the performance of the mechanical parts directly influences the engineering quality and safety.
The existing engineering fasteners are mainly made of carbon steel, high-strength steel, stainless steel and other materials. However, due to factors such as the used materials and the processing and manufacturing, the processing and manufacturing processes of the engineering fastener are complicated, the cost is too high, and the engineering fastener materials on the market have the defects of relatively poor corrosion resistance, easy oxidation, short service life, low strength, poor performance stability and the like.
In order to solve the problems, the patent CN103882319B discloses a production method of a high-performance engineering fastener material SCR420B, and the weight proportion of the components of cold heading steel is as follows: 0.18 to 0.23 percent of C, 0.15 to 0.35 percent of Si, 0.70 to 0.90 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.020 percent of S and the balance of Fe. The production process comprises the following steps: smelting → continuous casting → heating → finish rolling → weak cooling → spinning and looping → stelmor roller cooling, heating temperature: 1090-1170 ℃, initial rolling temperature: 1000-1060 ℃, finish rolling temperature: 910 ℃ and 950 ℃, and weak cooling temperature: 850-900 ℃, stelmor roller speed: 0.20 to 0.48 m/s. By using CaO-SiO 2 -Al 2 O 3 -MgO-CaF 2 Five-element slag system, enhanced deoxidation and desulfurization effectsEffectively remove inclusions in steel, improve the internal quality of steel, reduce the consumption of Mo and reduce the cost. However, the engineering fastener material still has the defects that the strength, the corrosion resistance and the fatigue resistance can be further improved.
Therefore, the high-performance engineering fastener material with strong corrosion resistance, good mechanical property, good fatigue resistance, sufficient performance stability and long service life and the production method thereof are still needed in the field.
Disclosure of Invention
The invention mainly aims to solve the technical problems of relatively poor corrosion resistance, easy oxidation, short service life, low strength, and poor performance stability and fatigue resistance of more or less engineering fastener materials on the market.
In order to achieve the above purpose, the invention provides a production method of a high-performance engineering fastener material, which is characterized by comprising the following steps:
step S1, preprocessing raw materials of engineering fasteners: selecting a steel bar as a raw material of an engineering fastener, and carrying out degreasing, dirt removal and rust removal treatment on the surface of the steel bar; the steel bar comprises the following components in percentage by mass: 0.05 to 0.16 percent of C, 0.8 to 1.2 percent of Si, 1.3 to 2.0 percent of Mn, 7.5 to 12.5 percent of Cr, 2.0 to 4.5 percent of Co, 1.0 to 2.2 percent of W, 0.005 to 0.1 percent of Hf, 0.001 to 0.007 percent of Ca, 0.4 to 0.6 percent of Cu, 0.01 to 0.05 percent of Nb, 0.002 to 0.006 percent of Ge, 0.0005 to 0.005 percent of B, less than or equal to 0.005 percent of N, less than or equal to 0.025 percent of P, less than or equal to 0.01 percent of S, 0.005 to 0.01 percent of nano titanium boride, 0.001 to 0.006 percent of nano aluminum nitride, and the balance of Fe and other inevitable impurities;
step S2, co-cementation: putting the co-permeation raw material into a permeation box, then putting the engineering fastener raw material processed in the step S1 into the permeation box, compacting, covering and sealing, and putting the permeation box into a heating furnace for co-permeation treatment to obtain a workpiece subjected to co-permeation treatment;
step S3, cleaning, heat treatment: placing the workpiece subjected to the co-cementation treatment in the step S2 in a molten salt cleaning agent at the temperature of 780-860 ℃ for cleaning for 1-2 minutes, and taking out the workpiece after water quenching and oil cooling; then placing the mixture in an annealing furnace, heating to 650 plus 720 ℃ at a speed of 5-10 ℃/min, and preserving heat for 1-2 h; then heating to 800-850 ℃ at a speed of 4-6 ℃/min, preserving the heat for 15-30s, taking out and naturally cooling; finally, heating to 190-240 ℃, preserving the heat for 3-5 hours, taking out and naturally cooling;
step S4, processing and forming: and (3) performing cold deformation by adopting a cold drawing process, and then performing thread machining to obtain the high-performance engineering fastener material.
Preferably, the degreasing, dirt removing and rust removing treatment in step S1 specifically includes: ultrasonically cleaning the mixture for 8-16 min in hydrochloric acid with the concentration of 1mol/L, ultrasonically cleaning the mixture for 10-13min by using ethanol, cleaning the mixture for 3-6min by using deionized water, and finally drying the mixture in a vacuum drying oven at the temperature of 90-100 ℃ to constant weight.
Preferably, the particle diameters of the nano titanium boride and the nano aluminum nitride are the same and are both 300-500 nm.
Preferably, the co-infiltration raw material in the step S2 comprises the following components in parts by weight: 5-8 parts of borax, 10-15 parts of nickel powder, 2-4 parts of molybdenum powder, 3-6 parts of copper oxide, 5-10 parts of boron nitride, 2-5 parts of graphene, 3-5 parts of cerium oxide, 1-3 parts of aluminum nitride, 20-30 parts of quartz sand, 0.05-0.15 part of ammonium chloride and 0.1-0.3 part of urea.
Preferably, the particle diameters of the nickel powder, the molybdenum powder, the copper oxide, the boron nitride, the graphene, the cerium oxide and the aluminum nitride are the same and are all 300-500 meshes; the particle size of the quartz sand is 80-120 meshes.
Preferably, the co-cementation treatment in step S2 specifically includes: preserving heat for 2-3 h at 0.01-0.16 MPa and 650-800 ℃, then heating to 820-920 ℃, preserving heat for 1-3 h, then cooling to 220-320 ℃ at the speed of 6-12 ℃/min, preserving heat for 15-30 min, cooling to room temperature, opening the box, and removing surface impurities.
Preferably, the molten salt cleaning agent in the step S3 includes the following components by weight: 30-40 parts of sodium chloride, 40-50 parts of barium chloride and 0.4-0.6 part of salt bath deoxidizer.
Preferably, the salt bath deoxidizer is a TSA high and medium-temperature salt bath compound deoxidizer, executes JB/T4390-2008 standard, and is purchased from Anqiu City Loop Heat treated materials, Inc.
Preferably, the thread processing in step S4 is formed by twisting with a thread rolling machine.
Another object of the present invention is to provide a high performance engineering fastener material produced by the above method for producing a high performance engineering fastener material.
Due to the application of the technical scheme, the invention has the following beneficial effects:
(1) the production method of the high-performance engineering fastener material disclosed by the invention is simple in process, convenient to operate, free of special equipment, high in production efficiency and finished product qualification rate, and suitable for continuous large-scale production.
(2) The invention discloses a high-performance engineering fastener material, which selects a steel bar as a raw material of an engineering fastener, wherein the steel bar comprises the following components in percentage by mass: 0.05 to 0.16 percent of C, 0.8 to 1.2 percent of Si, 1.3 to 2.0 percent of Mn, 7.5 to 12.5 percent of Cr, 2.0 to 4.5 percent of Co, 1.0 to 2.2 percent of W, 0.005 to 0.1 percent of Hf, 0.001 to 0.007 percent of Ca, 0.4 to 0.6 percent of Cu, 0.01 to 0.05 percent of Nb, 0.002 to 0.006 percent of Ge, 0.0005 to 0.005 percent of B, less than or equal to 0.005 percent of N, less than or equal to 0.025 percent of P, less than or equal to 0.01 percent of S, 0.005 to 0.01 percent of nano titanium boride, 0.001 to 0.006 percent of nano aluminum nitride, and the balance of Fe and other inevitable impurities; through reasonable selection of all components and content proportion and mutual cooperation and combined action, the manufactured engineering fastener material has strong corrosion resistance, good mechanical property, good fatigue resistance, sufficient performance stability and long service life. The addition of the nano titanium boride and the nano aluminum nitride can increase the number of the crystal grains and refine the grain size to fill the defects in the crystal and the crystal lattices, and form uniformly distributed hard particles in the structure to prevent the crystal from sliding and wearing, so that the product performance is improved, and the nano titanium boride and the nano aluminum nitride have synergistic effect with other components to ensure that the product performance is better.
(3) According to the high-performance engineering fastener material disclosed by the invention, the co-permeation layer is formed on the surface of the fastener material through the co-permeation treatment process, and the manufactured co-permeation layer has better corrosion resistance, oxidation resistance stability, mechanical property and wear resistance through the co-permeation process and the reasonable selection of co-permeation raw materials.
(4) The high-performance engineering fastener material disclosed by the invention has the advantages that through reasonable selection of cleaning and heat treatment processes, the manufactured fastener material has higher strength, better fatigue resistance and performance stability and longer service life.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
The salt bath deoxidizer in each embodiment of the invention is a TSA high and medium temperature salt bath compound deoxidizer, executes JB/T4390-2008 standard, and is purchased from Anqiu City Loop Heat treatment materials, Inc.
Example 1
A production method of a high-performance engineering fastener material comprises the following steps:
step S1, preprocessing raw materials of engineering fasteners: selecting a steel bar as a raw material of an engineering fastener, and carrying out grease removal, dirt removal and rust removal treatment on the surface of the steel bar; the steel bar comprises the following components in percentage by mass: 0.05 percent of C, 0.8 percent of Si, 1.3 percent of Mn, 7.5 percent of Cr, 2.0 percent of Co, 1.0 percent of W, 0.005 percent of Hf, 0.001 percent of Ca, 0.4 percent of Cu, 0.01 percent of Nb, 0.002 percent of Ge, 0.0005 percent of B, less than or equal to 0.005 percent of N, less than or equal to 0.025 percent of P, less than or equal to 0.01 percent of S, 0.005 percent of nano titanium boride, 0.001 percent of nano aluminum nitride, and the balance of Fe and other inevitable impurities;
step S2, co-cementation: putting the co-permeation raw material into a permeation box, then putting the engineering fastener raw material processed in the step S1 into the permeation box, compacting, covering and sealing, and putting the permeation box into a heating furnace for co-permeation treatment to obtain a workpiece subjected to co-permeation treatment;
step S3, cleaning, heat treatment: placing the workpiece subjected to the co-permeation treatment in the step S2 in a 780 ℃ molten salt cleaning agent for cleaning for 1 minute, and taking out the workpiece after water quenching and oil cooling; then placing the mixture into an annealing furnace, heating to 650 ℃ at the speed of 5 ℃/min, and preserving heat for 1 h; then heating to 800 ℃ at a speed of 4 ℃/min, preserving the heat for 15s, taking out and naturally cooling; finally, heating to 190 ℃, preserving the heat for 3 hours, taking out and naturally cooling;
step S4, processing and forming: and (3) performing cold deformation by adopting a cold drawing process, and then performing thread machining to obtain the high-performance engineering fastener material.
The degreasing, dirt removing and rust removing treatment in the step S1 specifically comprises the following steps: ultrasonically cleaning in 1mol/L hydrochloric acid for 8min, ultrasonically cleaning with ethanol for 10min, cleaning with deionized water for 3min, and drying in a vacuum drying oven at 90 deg.C to constant weight; the particle diameters of the nano titanium boride and the nano aluminum nitride are the same and are both 300 nm.
The co-permeation raw material in the step S2 comprises the following components in parts by weight: 5 parts of borax, 10 parts of nickel powder, 2 parts of molybdenum powder, 3 parts of copper oxide, 5 parts of boron nitride, 2 parts of graphene, 3 parts of cerium oxide, 1 part of aluminum nitride, 20 parts of quartz sand, 0.05 part of ammonium chloride and 0.1 part of urea; the particle sizes of the nickel powder, the molybdenum powder, the copper oxide, the boron nitride, the graphene, the cerium oxide and the aluminum nitride are the same and are all 300 meshes; the particle size of the quartz sand is 80 meshes.
The co-cementation treatment in the step S2 specifically includes: keeping the temperature at 650 ℃ under 0.01MPa for 2h, then heating to 820 ℃, keeping the temperature for 1h, then cooling to 220 ℃ at the speed of 6 ℃/min, keeping the temperature for 15min, cooling to room temperature, opening the box, and removing surface impurities.
The molten salt cleaning agent in the step S3 comprises the following components in parts by weight: 30 parts of sodium chloride, 40 parts of barium chloride and 0.4 part of salt bath deoxidizer.
The thread processing in step S4 is performed by thread rolling using a thread rolling machine.
The high-performance engineering fastener material produced by the production method of the high-performance engineering fastener material.
Example 2
A production method of a high-performance engineering fastener material comprises the following steps:
step S1, preprocessing raw materials of engineering fasteners: selecting a steel bar as a raw material of an engineering fastener, and carrying out degreasing, dirt removal and rust removal treatment on the surface of the steel bar; the steel bar comprises the following components in percentage by mass: 0.08 percent of C, 0.9 percent of Si, 1.5 percent of Mn, 9 percent of Cr, 2.5 percent of Co, 1.3 percent of W, 0.02 percent of Hf, 0.002 percent of Ca, 0.45 percent of Cu, 0.02 percent of Nb, 0.003 percent of Ge, 0.002 percent of B, less than or equal to 0.005 percent of N, less than or equal to 0.025 percent of P, less than or equal to 0.01 percent of S, 0.006 percent of nano titanium boride, 0.002 percent of nano aluminum nitride, and the balance of Fe and other inevitable impurities;
step S2, co-cementation treatment: putting the co-permeation raw material into a permeation box, then putting the engineering fastener raw material processed in the step S1 into the permeation box, compacting, covering and sealing, and putting the permeation box into a heating furnace for co-permeation treatment to obtain a workpiece subjected to co-permeation treatment;
step S3, cleaning, heat treatment: cleaning the workpiece subjected to the co-cementation treatment in the step S2 in a molten salt cleaning agent at 800 ℃ for 1.2 minutes, and taking out the workpiece after water quenching and oil cooling; then placing the mixture into an annealing furnace, heating to 670 ℃ at the speed of 6 ℃/min, and preserving heat for 1.2 h; then heating to 820 ℃ at a speed of 4.5 ℃/min, preserving the heat for 18s, taking out and naturally cooling; finally, heating to 210 ℃, preserving the heat for 3.5 hours, taking out and naturally cooling;
step S4, processing and forming: and (3) performing cold deformation by adopting a cold drawing process, and then performing thread machining to obtain the high-performance engineering fastener material.
The oil and fat removal, dirt removal and rust removal treatment in the step S1 specifically comprises the following steps: ultrasonically cleaning in 1mol/L hydrochloric acid for 11min, ultrasonically cleaning with ethanol for 11min, cleaning with deionized water for 4min, and drying in a vacuum drying oven at 93 deg.C to constant weight; the particle diameters of the nano titanium boride and the nano aluminum nitride are the same and are both 350 nm.
The co-permeation raw material in the step S2 comprises the following components in parts by weight: 6 parts of borax, 12 parts of nickel powder, 2.5 parts of molybdenum powder, 4 parts of copper oxide, 6 parts of boron nitride, 3 parts of graphene, 3.5 parts of cerium oxide, 1.5 parts of aluminum nitride, 23 parts of quartz sand, 0.08 part of ammonium chloride and 0.15 part of urea; the particle sizes of the nickel powder, the molybdenum powder, the copper oxide, the boron nitride, the graphene, the cerium oxide and the aluminum nitride are the same and are all 350 meshes; the particle size of the quartz sand is 90 meshes.
The co-cementation treatment in the step S2 specifically includes: preserving heat for 2.3h at 680 ℃ under 0.05MPa, then heating to 850 ℃, preserving heat for 1.5h, then cooling to 240 ℃ at the speed of 8 ℃/min, preserving heat for 19min, cooling to room temperature, opening the box, and removing surface impurities.
The molten salt cleaning agent in the step S3 comprises the following components in parts by weight: 33 parts of sodium chloride, 43 parts of barium chloride and 0.45 part of salt bath deoxidizer.
The thread processing in step S4 is performed by thread rolling.
The high-performance engineering fastener material is produced by the production method of the high-performance engineering fastener material.
Example 3
A production method of a high-performance engineering fastener material comprises the following steps:
step S1, preprocessing raw materials of engineering fasteners: selecting a steel bar as a raw material of an engineering fastener, and carrying out grease removal, dirt removal and rust removal treatment on the surface of the steel bar; the steel bar comprises the following components in percentage by mass: 0.11% of C, 1% of Si, 1.6% of Mn, 10.5% of Cr, 3% of Co, 1.6% of W, 0.007% of Hf, 0.004% of Ca, 0.5% of Cu, 0.035% of Nb, 0.004% of Ge, 0.003% of B, less than or equal to 0.005% of N, less than or equal to 0.025% of P, less than or equal to 0.01% of S, 0.008% of nano titanium boride, 0.004% of nano aluminum nitride, and the balance of Fe and other inevitable impurities;
step S2, co-cementation treatment: putting the co-permeation raw material into a permeation box, then putting the engineering fastener raw material processed in the step S1 into the permeation box, compacting, covering and sealing, and putting the permeation box into a heating furnace for co-permeation treatment to obtain a workpiece subjected to co-permeation treatment;
step S3, cleaning, heat treatment: cleaning the workpiece subjected to the co-permeation treatment in the step S2 in a molten salt cleaning agent at 820 ℃ for 1.5 minutes, and taking out the workpiece after water quenching and oil cooling; then placing the mixture into an annealing furnace, heating to 690 ℃ at a speed of 7.5 ℃/min, and preserving heat for 1.5 h; then heating to 830 ℃ at the speed of 5 ℃/min, preserving the heat for 22s, taking out and naturally cooling; finally, heating to 215 ℃, preserving the heat for 4 hours, taking out and naturally cooling;
step S4, processing and forming: and (3) performing cold deformation by adopting a cold drawing process, and then performing thread machining to obtain the high-performance engineering fastener material.
The degreasing, dirt removing and rust removing treatment in the step S1 specifically comprises the following steps: ultrasonically cleaning in 1mol/L hydrochloric acid for 13min, ultrasonically cleaning with ethanol for 12min, cleaning with deionized water for 4.5min, and drying in a vacuum drying oven at 95 ℃ to constant weight; the particle diameters of the nano titanium boride and the nano aluminum nitride are the same and are both 400 nm.
The co-permeation raw material in the step S2 comprises the following components in parts by weight: 6.5 parts of borax, 13 parts of nickel powder, 3 parts of molybdenum powder, 4.5 parts of copper oxide, 7.5 parts of boron nitride, 3.5 parts of graphene, 4 parts of cerium oxide, 2 parts of aluminum nitride, 25 parts of quartz sand, 0.1 part of ammonium chloride and 0.2 part of urea; the particle sizes of the nickel powder, the molybdenum powder, the copper oxide, the boron nitride, the graphene, the cerium oxide and the aluminum nitride are the same and are all 400 meshes; the particle size of the quartz sand is 100 meshes.
The co-cementation treatment in the step S2 specifically includes: keeping the temperature at 710 ℃ under 0.1MPa for 2.5h, then heating to 880 ℃, keeping the temperature for 2h, then cooling to 280 ℃ at the speed of 9 ℃/min, keeping the temperature for 24min, and then cooling to room temperature.
The molten salt cleaning agent in the step S3 comprises the following components in parts by weight: 35 parts of sodium chloride, 45 parts of barium chloride and 0.5 part of salt bath deoxidizer.
The thread processing in step S4 is performed by thread rolling using a thread rolling machine.
The high-performance engineering fastener material produced by the production method of the high-performance engineering fastener material.
Example 4
A production method of a high-performance engineering fastener material comprises the following steps:
step S1, preprocessing raw materials of engineering fasteners: selecting a steel bar as a raw material of an engineering fastener, and carrying out grease removal, dirt removal and rust removal treatment on the surface of the steel bar; the steel bar comprises the following components in percentage by mass: 0.14% of C, 1.1% of Si, 1.8% of Mn, 11.5% of Cr, 4% of Co, 1.9% of W, 0.08% of Hf, 0.006% of Ca, 0.55% of Cu, 0.04% of Nb, 0.005% of Ge, 0.0005-0.005% of B, less than or equal to 0.005% of N, less than or equal to 0.025% of P, less than or equal to 0.01% of S, 0.009% of nano titanium boride, 0.005% of nano aluminum nitride, and the balance of Fe and other inevitable impurities;
step S2, co-cementation: putting the co-permeation raw material into a permeation box, then putting the engineering fastener raw material processed in the step S1 into the permeation box, compacting, covering and sealing, and putting the permeation box into a heating furnace for co-permeation treatment to obtain a workpiece subjected to co-permeation treatment;
step S3, cleaning, heat treatment: placing the workpiece subjected to the co-infiltration treatment in the step S2 in a fused salt cleaning agent at 850 ℃ for cleaning for 1.8 minutes, and taking out the workpiece after water quenching and oil cooling; then placing the mixture into an annealing furnace, heating to 710 ℃ at a speed of 9 ℃/min, and preserving heat for 1.8 h; heating to 840 ℃ at a speed of 5.5 ℃/min, preserving the heat for 28s, taking out and naturally cooling; finally, heating to 230 ℃, preserving the heat for 4.5 hours, taking out and naturally cooling;
step S4, processing and forming: and (3) performing cold deformation by adopting a cold drawing process, and then performing thread machining to obtain the high-performance engineering fastener material.
The degreasing, dirt removing and rust removing treatment in the step S1 specifically comprises the following steps: ultrasonically cleaning in 1mol/L hydrochloric acid for 14min, ultrasonically cleaning with ethanol for 12.5min, cleaning with deionized water for 5.5min, and drying in a vacuum drying oven at 98 deg.C to constant weight; the particle diameters of the nano titanium boride and the nano aluminum nitride are the same and are both 450 nm.
The co-permeation raw material in the step S2 comprises the following components in parts by weight: 7.5 parts of borax, 14 parts of nickel powder, 3.5 parts of molybdenum powder, 5.5 parts of copper oxide, 9 parts of boron nitride, 4.5 parts of graphene, 4.5 parts of cerium oxide, 2.5 parts of aluminum nitride, 28 parts of quartz sand, 0.13 part of ammonium chloride and 0.25 part of urea; the particle sizes of the nickel powder, the molybdenum powder, the copper oxide, the boron nitride, the graphene, the cerium oxide and the aluminum nitride are the same and are all 450 meshes; the particle size of the quartz sand is 110 meshes.
The co-cementation treatment in the step S2 specifically includes: maintaining the temperature at 0.13MPa and 780 ℃ for 2.8h, then heating to 910 ℃, maintaining the temperature for 2.5h, then cooling to 310 ℃ at the speed of 11 ℃/min, maintaining the temperature for 28min, and then cooling to room temperature.
The molten salt cleaning agent in the step S3 comprises the following components in parts by weight: 38 parts of sodium chloride, 48 parts of barium chloride and 0.55 part of salt bath deoxidizer.
The thread processing in step S4 is performed by thread rolling.
The high-performance engineering fastener material produced by the production method of the high-performance engineering fastener material.
Example 5
A production method of a high-performance engineering fastener material comprises the following steps:
step S1, preprocessing raw materials of engineering fasteners: selecting a steel bar as a raw material of an engineering fastener, and carrying out degreasing, dirt removal and rust removal treatment on the surface of the steel bar; the steel bar comprises the following components in percentage by mass: 0.16% of C, 1.2% of Si, 2.0% of Mn, 12.5% of Cr, 4.5% of Co, 2.2% of W, 0.1% of Hf, 0.007% of Ca, 0.6% of Cu, 0.05% of Nb, 0.006% of Ge, 0.005% of B, less than or equal to 0.005% of N, less than or equal to 0.025% of P, less than or equal to 0.01% of S, 0.01% of nano titanium boride, 0.006% of nano aluminum nitride, and the balance Fe and other inevitable impurities;
step S2, co-cementation treatment: putting the co-permeation raw material into a permeation box, then putting the engineering fastener raw material processed in the step S1 into the permeation box, compacting, covering and sealing, and putting the permeation box into a heating furnace for co-permeation treatment to obtain a workpiece subjected to co-permeation treatment;
step S3, cleaning, heat treatment: placing the workpiece subjected to the co-cementation treatment in the step S2 in a fused salt cleaning agent at 860 ℃ for cleaning for 2 minutes, and taking out the workpiece after water quenching and oil cooling; then placing the mixture into an annealing furnace, heating to 720 ℃ at a speed of 10 ℃/min, and preserving heat for 2 h; then heating to 850 ℃ at the speed of 6 ℃/min, preserving the heat for 30s, taking out and naturally cooling; finally, heating to 240 ℃, preserving the heat for 5 hours, taking out and naturally cooling;
step S4, processing and forming: and (3) performing cold deformation by adopting a cold drawing process, and then performing thread machining to obtain the high-performance engineering fastener material.
The oil and fat removal, dirt removal and rust removal treatment in the step S1 specifically comprises the following steps: ultrasonically cleaning in 1mol/L hydrochloric acid for 16min, ultrasonically cleaning with ethanol for 13min, cleaning with deionized water for 6min, and drying in a vacuum drying oven at 100 deg.C to constant weight; the particle diameters of the nano titanium boride and the nano aluminum nitride are the same and are both 500 nm.
The co-permeation raw material in the step S2 comprises the following components in parts by weight: 8 parts of borax, 15 parts of nickel powder, 4 parts of molybdenum powder, 6 parts of copper oxide, 10 parts of boron nitride, 5 parts of graphene, 5 parts of cerium oxide, 3 parts of aluminum nitride, 30 parts of quartz sand, 0.15 part of ammonium chloride and 0.3 part of urea; the particle sizes of the nickel powder, the molybdenum powder, the copper oxide, the boron nitride, the graphene, the cerium oxide and the aluminum nitride are the same and are all 500 meshes; the particle size of the quartz sand is 120 meshes.
The co-cementation treatment in the step S2 specifically includes: preserving heat for 3h at 800 ℃ under 0.16MPa, then heating to 920 ℃, preserving heat for 3h, then cooling to 320 ℃ at the speed of 12 ℃/min, preserving heat for 30min, and then cooling to room temperature.
The molten salt cleaning agent in the step S3 comprises the following components in parts by weight: 40 parts of sodium chloride, 50 parts of barium chloride and 0.6 part of salt bath deoxidizer.
The thread processing in step S4 is performed by thread rolling using a thread rolling machine.
The high-performance engineering fastener material is produced by the production method of the high-performance engineering fastener material.
Comparative example 1
The invention provides a high-performance engineering fastener material, which is similar to the formula and the production method of the high-performance engineering fastener material in example 1, except that Hf, Ge, nano titanium boride, boron nitride and graphene are not added.
Comparative example 2
The invention provides a high-performance engineering fastener material, the formula and the production method of which are similar to those of example 1, except that Ca, Cu, nano aluminum nitride, molybdenum powder and copper oxide are not added.
In order to further illustrate the beneficial technical effects of the high-performance engineering fastener material manufactured by the embodiments of the present invention, the high-performance engineering fastener material manufactured by the embodiments of the present invention is subjected to a relevant performance test, and the test results are shown in table 1, wherein the corrosion resistance test method is as follows: the prepared high-performance engineering fastener material is subjected to a salt spray corrosion resistance test, the test temperature is 35 ℃, a 5% sodium chloride aqueous solution with mass concentration is sprayed in a test box to simulate the accelerated corrosion of the environment, and the tolerance time (namely the time for maintaining the material not rusted) of the engineering fastener material determines the corrosion resistance; the strength and fatigue properties were tested using test methods conventional in the art.
As can be seen from Table 1, the high-performance engineering fastener material disclosed in the embodiment of the invention has more excellent mechanical properties, corrosion resistance and fatigue resistance compared with the comparative product, which are the result of the synergistic effect of the components and raw materials. Hf. The addition of Ge, nano titanium boride, boron nitride, graphene, Ca, Cu, nano aluminum nitride, molybdenum powder and copper oxide is beneficial to improving the above properties.
TABLE 1
| Item | Tensile strength (MPa) | Fatigue life (thousands times) | Corrosion resistance (h) |
| Example 1 | 1350 | 9.4 | 98 |
| Example 2 | 1362 | 9.6 | 102 |
| Example 3 | 1370 | 9.7 | 104 |
| Example 4 | 1375 | 9.9 | 109 |
| Example 5 | 1382 | 10.2 | 110 |
| Comparative example 1 | 1190 | 8.8 | 86 |
| Comparative example 2 | 1213 | 8.6 | 80 |
The foregoing shows and describes the general principles, principal features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A production method of a high-performance engineering fastener material is characterized by comprising the following steps:
step S1, preprocessing raw materials of engineering fasteners: selecting a steel bar as a raw material of an engineering fastener, and carrying out degreasing, dirt removal and rust removal treatment on the surface of the steel bar; the steel bar comprises the following components in percentage by mass: 0.05 to 0.16 percent of C, 0.8 to 1.2 percent of Si, 1.3 to 2.0 percent of Mn, 7.5 to 12.5 percent of Cr, 2.0 to 4.5 percent of Co, 1.0 to 2.2 percent of W, 0.005 to 0.1 percent of Hf, 0.001 to 0.007 percent of Ca, 0.4 to 0.6 percent of Cu, 0.01 to 0.05 percent of Nb, 0.002 to 0.006 percent of Ge, 0.0005 to 0.005 percent of B, less than or equal to 0.005 percent of N, less than or equal to 0.025 percent of P, less than or equal to 0.01 percent of S, 0.005 to 0.01 percent of nano titanium boride, 0.001 to 0.006 percent of nano aluminum nitride, and the balance of Fe and other inevitable impurities;
step S2, co-cementation treatment: putting the co-permeation raw material into a permeation box, then putting the engineering fastener raw material processed in the step S1 into the permeation box, compacting, covering and sealing, and putting the permeation box into a heating furnace for co-permeation treatment to obtain a workpiece subjected to co-permeation treatment;
step S3, cleaning, heat treatment: placing the workpiece subjected to the co-cementation treatment in the step S2 in a molten salt cleaning agent at the temperature of 780-860 ℃ for cleaning for 1-2 minutes, and taking out the workpiece after water quenching and oil cooling; then placing the mixture in an annealing furnace, heating to 650 plus 720 ℃ at a speed of 5-10 ℃/min, and preserving heat for 1-2 h; then heating to 800-; finally, heating to 190-240 ℃, preserving heat for 3-5 hours, and taking out for natural cooling;
step S4, processing and forming: and (3) performing cold deformation by adopting a cold drawing process, and then performing thread machining to obtain the high-performance engineering fastener material.
2. The method for producing the high-performance engineering fastener material as claimed in claim 1, wherein the degreasing, dirt removal and rust removal treatment in step S1 is specifically: ultrasonically cleaning the mixture for 8-16 min in hydrochloric acid with the concentration of 1mol/L, ultrasonically cleaning the mixture for 10-13min by using ethanol, cleaning the mixture for 3-6min by using deionized water, and finally drying the mixture in a vacuum drying oven at the temperature of 90-100 ℃ to constant weight.
3. The method for producing the high-performance engineering fastener material as claimed in claim 1, wherein the nano titanium boride and the nano aluminum nitride have the same particle size, which is 300-500 nm.
4. The method for producing high-performance engineering fastener material according to claim 1, wherein the co-permeation raw material in the step S2 comprises the following components in parts by weight: 5-8 parts of borax, 10-15 parts of nickel powder, 2-4 parts of molybdenum powder, 3-6 parts of copper oxide, 5-10 parts of boron nitride, 2-5 parts of graphene, 3-5 parts of cerium oxide, 1-3 parts of aluminum nitride, 20-30 parts of quartz sand, 0.05-0.15 part of ammonium chloride and 0.1-0.3 part of urea.
5. The method for producing high performance engineering fastener material as claimed in claim 4, wherein the particle diameters of the nickel powder, molybdenum powder, copper oxide, boron nitride, graphene, cerium oxide and aluminum nitride are the same and are all 300-500 mesh; the particle size of the quartz sand is 80-120 meshes.
6. The method for producing high-performance engineering fastener material according to claim 1, wherein the co-cementation treatment in step S2 is specifically: preserving heat for 2-3 h at 0.01-0.16 MPa and 650-800 ℃, then heating to 820-920 ℃, preserving heat for 1-3 h, then cooling to 220-320 ℃ at the speed of 6-12 ℃/min, preserving heat for 15-30 min, cooling to room temperature, opening the box, and removing surface impurities.
7. The method for producing high-performance engineering fastener material according to claim 1, wherein the molten salt cleaning agent in the step S3 comprises the following components in parts by weight: 30-40 parts of sodium chloride, 40-50 parts of barium chloride and 0.4-0.6 part of salt bath deoxidizer.
8. The method for producing high performance engineering fastener material according to claim 1, wherein the thread processing in step S4 is thread rolling by a thread rolling machine.
9. A high performance engineering fastener material produced by the method of any one of claims 1 to 8.
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