CN115747655A - High-strength material for fasteners and preparation method thereof - Google Patents
High-strength material for fasteners and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-strength material for a fastener and a preparation method thereof, which relate to the technical field of part manufacturing and comprise a body material and an anticorrosive coating arranged on the outer surface of the body material; the body material is prepared from the following components in percentage by weight: 0.1 to 0.3 percent of C, 0.4 to 0.9 percent of Si, 1.1 to 2.0 percent of Mn, 0.1 to 0.4 percent of Zr, 0.01 to 0.04 percent of Ir, 0.2 to 0.5 percent of Ga, 0.001 to 0.005 percent of Sr, 0.5 to 0.9 percent of W, 0.001 to 0.003 percent of rare earth element, 0.003 to 0.005 percent of nano silicon boride, 0.001 to 0.003 percent of nano titanium nitride, and the balance of Fe and other inevitable impurity elements. The high-strength material for fasteners disclosed by the invention is excellent in delayed fracture resistance, corrosion resistance and mechanical properties.
Description
Technical Field
The invention relates to the technical field of part manufacturing, in particular to a high-strength material for a fastener and a preparation method thereof.
Background
With the rapid development of economic and modern industries, various production departments such as automobiles, machinery, buildings, light industry and the like put higher demands on various fasteners (such as bolts, nuts and the like). In order to meet the requirements of high performance, light weight and various engineering safety of various structural parts, it is important to develop a high-strength material for fasteners with good comprehensive performance and performance stability.
The existing fasteners are 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 complex, 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, low-temperature brittleness, easy fracture and the like. The high-strength material for the fasteners on the market also has the technical problems that the delayed fracture resistance, the corrosion resistance and the mechanical property cannot be simultaneously improved, the performance stability is poor and the service life is short.
In order to improve the strength of a fastener, chinese patent application No. CN201110049698.2, entitled "alloy steel for high-strength and high-toughness bolt and preparation method thereof" (application publication No. CN 102094153A) discloses an alloy steel for a bolt, which comprises the following alloy elements in percentage by weight: 0.15-0.23C; 0.10 to 0.35 Si; 0.20-0.45 Mn; p is less than or equal to 0.03; s is less than or equal to 0.025; 1.10-1.45 Cr; 3.30-3.90 Ni; 0.20-0.45 Mo; cu is less than or equal to 0.05; al is less than or equal to 0.03, and the balance is Fe and impurity elements. The alloy steel disclosed in this application can improve the strength of the bolt to some extent, but cannot improve delayed fracture of the bolt.
Therefore, how to provide a high-strength material for fasteners, which has excellent delayed fracture resistance, corrosion resistance and mechanical properties, good performance stability and long service life, and a preparation method thereof are difficult problems to be solved urgently in the current industry.
Disclosure of Invention
The invention mainly aims to provide a high-strength material for fasteners, which has excellent delayed fracture resistance, corrosion resistance and mechanical properties, good performance stability and long service life, and a preparation method thereof.
In order to achieve the above purpose, the invention provides a high-strength material for a fastener, which comprises a body material and an anti-corrosion coating arranged on the outer surface of the body material; the body material is prepared from the following components in percentage by weight: 0.1 to 0.3 percent of C, 0.4 to 0.9 percent of Si, 1.1 to 2.0 percent of Mn, 0.1 to 0.4 percent of Zr, 0.01 to 0.04 percent of Ir, 0.2 to 0.5 percent of Ga, 0.001 to 0.005 percent of Sr, 0.5 to 0.9 percent of W, 0.001 to 0.003 percent of rare earth element, 0.003 to 0.005 percent of nano silicon boride, 0.001 to 0.003 percent of nano titanium nitride, and the balance of Fe and other inevitable impurity elements; the anticorrosive coating is prepared from the following components in parts by weight: 40-50 parts of allylated hyperbranched polyphenylene oxide, 10-15 parts of vinyl hyperbranched polysiloxane, 3-5 parts of methyl vinyl silafluorene, 1-3 parts of 2- (1-propylene-2-yl) benzo [ D ] oxazole, 2-5 parts of 2, 3-tetrafluoropropyl methacrylate, 10-15 parts of glass fiber, 1-3 parts of coupling agent, 1-2 parts of initiator and 30-40 parts of solvent.
Preferably, the solvent is at least one of N, N-dimethylformamide, N-methylpyrrolidone and N, N-dimethylacetamide.
Preferably, the initiator is at least one of azobisisoheptonitrile and azobisisobutyronitrile; the coupling agent is at least one of a silane coupling agent KH550, a silane coupling agent KH560 and a silane coupling agent KH570;
preferably, the glass fiber is alkali-free glass fiber, the average diameter of the glass fiber is 3-8 μm, and the length-diameter ratio is (16-27): 1.
Preferably, the vinyl hyperbranched polysiloxane is prepared according to the method of example 1 in CN 102276836B; the allylated hyperbranched polyphenylene ether is prepared by the method of example 3 in CN 101717503B.
Preferably, the particle size of the nano silicon boride is 60nm, and the particle size of the nano titanium nitride is 20nm.
Preferably, the rare earth element is a mixture formed by mixing Pr and Ce according to the mass ratio of 3 (3-5).
Preferably, the thickness of the anti-corrosion coating is 100-300 μm.
Another object of the present invention is to provide a method for preparing the high-strength material for fasteners, which comprises the following steps:
s1, smelting raw materials of Fe, fe-C intermediate alloy, fe-Si intermediate alloy, fe-Mn intermediate alloy, fe-Zr intermediate alloy, fe-Ir intermediate alloy, fe-Ga intermediate alloy, fe-Sr intermediate alloy, fe-W intermediate alloy, fe-Pr intermediate alloy and Fe-Ce intermediate alloy in a vacuum induction furnace, stirring after all the raw materials are completely melted to ensure that the alloy components are uniform, doping nano silicon boride and nano titanium nitride preheated to 750-850 ℃ into the molten alloy, stirring to ensure that the components are uniform, introducing the stirred and doped molten alloy into a mold under the nitrogen atmosphere for cooling, and demolding to obtain a high-strength material blank for a fastener; then sequentially carrying out heat strengthening treatment, tempering treatment and annealing treatment to obtain a body material;
and S2, uniformly mixing all components of the anticorrosive coating according to parts by weight, coating the anticorrosive coating on the surface of the body material, curing at 90-110 ℃ for 2-3 hours, and curing at 160-200 ℃ for 0.5-1 hour to obtain the high-strength material for the fastener.
Preferably, the heat-strengthening treatment in step S1 includes a first-stage heat-strengthening treatment, a second-stage heat-strengthening treatment, and a third-stage heat-strengthening treatment; the treatment temperature of the first-stage heat strengthening treatment is 620-640 ℃, and the treatment time is 1-2 h; the processing temperature of the second-stage heat strengthening treatment is 650-680 ℃, and the processing time is 2-3 h; the treatment temperature of the third-stage heat strengthening treatment is 750-820 ℃, and the treatment time is 1-2h.
Preferably, the tempering temperature of the tempering treatment in the step S1 is 500-650 ℃, and the heat preservation time is 1-3 hours; the annealing temperature of the annealing treatment is 700-850 ℃, and the heat preservation time is 1-2h.
Due to the application of the technical scheme, the invention has the following beneficial effects:
(1) The preparation method of the high-strength material for the fastener disclosed by the invention can be realized by adopting conventional equipment, does not need special equipment and a production line, has the advantages of low capital investment, simple and easily-operated preparation process and high preparation efficiency and finished product qualification rate, and is suitable for continuous large-scale production.
(2) The invention discloses a high-strength material for a fastener, which comprises a body material and an anticorrosive coating arranged on the outer surface of the body material; through the structural arrangement, the corrosion resistance of the steel can be effectively improved, the service life of the steel can be prolonged, and meanwhile, the high strength can be ensured; the body material is prepared from the following components in percentage by weight: 0.1 to 0.3 percent of C, 0.4 to 0.9 percent of Si, 1.1 to 2.0 percent of Mn, 0.1 to 0.4 percent of Zr, 0.01 to 0.04 percent of Ir, 0.2 to 0.5 percent of Ga, 0.001 to 0.005 percent of Sr, 0.5 to 0.9 percent of W, 0.001 to 0.003 percent of rare earth element, 0.003 to 0.005 percent of nano silicon boride, 0.001 to 0.003 percent of nano titanium nitride, and the balance of Fe and other inevitable impurity elements; through reasonable selection of the components and the component contents, the synergistic effect can be better exerted among the components, and under the mutual cooperation and combined action of the components, the prepared material has excellent delayed fracture resistance, corrosion resistance and mechanical property, good performance stability and long service life.
(3) The invention discloses a high-strength material for fasteners, which is characterized in that an anticorrosive coating is prepared from the following components in parts by weight: 40-50 parts of allylated hyperbranched polyphenylene oxide, 10-15 parts of vinyl hyperbranched polysiloxane, 3-5 parts of methyl vinyl silafluorene, 1-3 parts of 2- (1-propylene-2-yl) benzo [ D ] oxazole, 2-5 parts of 2, 3-tetrafluoropropyl methacrylate, 10-15 parts of glass fiber, 1-3 parts of coupling agent, 1-2 parts of initiator and 30-40 parts of solvent; through the interaction among all components, hyperbranched polyphenyl ether, hyperbranched polysiloxane, silafluorene, oxazole and fluorine-containing structures are introduced into the molecular structure of the coating at the same time, interaction influence often exists among the structures, and under the multiple actions of an electronic effect, a steric hindrance effect and a conjugation effect, the high-strength material for the manufactured fastener is good in corrosion resistance, good in weather resistance and long in service life. The monomer containing unsaturated ethylenic bonds can generate cross-linking curing reaction under the action of an initiator to form an interpenetrating network structure, and glass fibers are introduced into the interpenetrating network structure, so that the corrosion resistance and the mechanical strength are further improved.
Detailed Description
The following description is provided to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments described below are by way of example only, and other obvious variations will occur to those skilled in the art.
Example 1
A high-strength material for fasteners comprises a body material and an anti-corrosion coating arranged on the outer surface of the body material; the body material is prepared from the following components in percentage by weight: 0.1% of C, 0.4% of Si, 1.1% of Mn, 0.1% of Zr, 0.01% of Ir, 0.2% of Ga, 0.001% of Sr, 0.5% of W, 0.001% of rare earth element, 0.003% of nano silicon boride, 0.001% of nano titanium nitride and the balance of Fe and other inevitable impurity elements; the anticorrosive coating is prepared from the following components in parts by weight: 40 parts of allylated hyperbranched polyphenylene oxide, 10 parts of vinyl hyperbranched polysiloxane, 3 parts of methyl vinyl silafluorene, 1 part of 2- (1-propylene-2-yl) benzo [ D ] oxazole, 2 parts of 2, 3-tetrafluoropropyl methacrylate, 10 parts of glass fiber, 1 part of coupling agent, 1 part of initiator and 30 parts of solvent.
The solvent is N, N-dimethylformamide; the initiator is azobisisoheptonitrile; the coupling agent is a silane coupling agent KH550; the glass fiber is alkali-free glass fiber, the average diameter of the glass fiber is 8 μm, and the length-diameter ratio is 16.
The vinyl hyperbranched polysiloxane is prepared by the method of example 1 in CN 102276836B; the allylated hyperbranched polyphenylene oxide is prepared by the method of example 3 in CN 101717503B; the particle size of the nano silicon boride is 60nm, and the particle size of the nano titanium nitride is 20nm; the rare earth element is a mixture formed by mixing Pr and Ce according to a mass ratio of 3.
The thickness of the anticorrosive coating is 200 μm.
A preparation method of the high-strength material for the fastener comprises the following steps:
s1, smelting raw materials of Fe, fe-C intermediate alloy, fe-Si intermediate alloy, fe-Mn intermediate alloy, fe-Zr intermediate alloy, fe-Ir intermediate alloy, fe-Ga intermediate alloy, fe-Sr intermediate alloy, fe-W intermediate alloy, fe-Pr intermediate alloy and Fe-Ce intermediate alloy in a vacuum induction furnace, stirring after all the raw materials are completely melted to ensure that the alloy components are uniform, doping the nano silicon boride and nano titanium nitride preheated to 750 ℃ into the smelted alloy melt, then stirring to ensure that the components are uniform, introducing the stirred and doped alloy melt into a mold under the nitrogen atmosphere for cooling, and obtaining a high-strength material blank for a fastener after demolding; then sequentially carrying out heat strengthening treatment, tempering treatment and annealing treatment to obtain a body material;
and S2, uniformly mixing the components of the anticorrosive coating according to the parts by weight, coating the anticorrosive coating on the surface of the body material, curing at 90 ℃ for 2 hours, and curing at 160 ℃ for 0.5 hour to obtain the high-strength material for the fastener.
The heat strengthening treatment in the step S1 comprises a first stage heat strengthening treatment, a second stage heat strengthening treatment and a third stage heat strengthening treatment; the treatment temperature of the first-stage heat strengthening treatment is 620 ℃, and the treatment time is 1h; the treatment temperature of the second-stage heat strengthening treatment is 650 ℃, and the treatment time is 2 hours; the processing temperature of the third-stage heat strengthening treatment is 750 ℃, and the processing time is 1h; the tempering temperature of the tempering treatment in the step S1 is 500 ℃, and the heat preservation time is 1 hour; the annealing temperature of the annealing treatment is 700 ℃, and the heat preservation time is 1h.
Example 2
A high-strength material for fasteners comprises a body material and an anti-corrosion coating arranged on the outer surface of the body material; the body material is prepared from the following components in percentage by weight: 0.15% of C, 0.5% of Si, 1.3% of Mn, 0.2% of Zr, 0.02% of Ir, 0.3% of Ga, 0.002% of Sr, 0.6% of W, 0.0015% of rare earth elements, 0.0035% of nano silicon boride, 0.0015% of nano titanium nitride and the balance of Fe and other inevitable impurity elements; the anticorrosive coating is prepared from the following components in parts by weight: 43 parts of allylated hyperbranched polyphenylene oxide, 12 parts of vinyl hyperbranched polysiloxane, 3.5 parts of methyl vinyl silafluorene, 1.5 parts of 2- (1-propylene-2-yl) benzo [ D ] oxazole, 3 parts of 2, 3-tetrafluoropropyl methacrylate, 11 parts of glass fiber, 1.5 parts of coupling agent, 1.2 parts of initiator and 32 parts of solvent.
The solvent is N-methyl pyrrolidone; the initiator is azobisisobutyronitrile; the coupling agent is a silane coupling agent KH560; the glass fiber is alkali-free glass fiber, the average diameter of the glass fiber is 6 μm, and the length-diameter ratio is 19.
The vinyl hyperbranched polysiloxane is prepared by the method of example 1 in CN 102276836B; the allylated hyperbranched polyphenylene oxide is prepared by the method of example 3 in CN 101717503B; the particle size of the nano silicon boride is 60nm, and the particle size of the nano titanium nitride is 20nm; the rare earth element is a mixture formed by mixing Pr and Ce according to the mass ratio of 3.5.
The thickness of the anticorrosive coating is 200 μm.
A preparation method of the high-strength material for the fastener comprises the following steps:
s1, smelting raw materials of Fe, fe-C intermediate alloy, fe-Si intermediate alloy, fe-Mn intermediate alloy, fe-Zr intermediate alloy, fe-Ir intermediate alloy, fe-Ga intermediate alloy, fe-Sr intermediate alloy, fe-W intermediate alloy, fe-Pr intermediate alloy and Fe-Ce intermediate alloy in a vacuum induction furnace, stirring after all the raw materials are completely melted to ensure that the alloy components are uniform, doping nano silicon boride and nano titanium nitride preheated to 790 ℃ into the molten alloy, stirring to ensure that the components are uniform, introducing the stirred and doped molten alloy into a mold in a nitrogen atmosphere for cooling, and demolding to obtain a high-strength material blank for a fastener; then sequentially carrying out heat strengthening treatment, tempering treatment and annealing treatment to obtain a body material;
and S2, uniformly mixing the components of the anticorrosive coating according to the parts by weight, coating the anticorrosive coating on the surface of the body material, curing at 95 ℃ for 2.3 hours, and curing at 170 ℃ for 0.6 hour to obtain the high-strength material for the fastener.
Preferably, the heat strengthening treatment in step S1 includes a first stage heat strengthening treatment, a second stage heat strengthening treatment, and a third stage heat strengthening treatment; the treatment temperature of the first-stage heat strengthening treatment is 625 ℃, and the treatment time is 1.2h; the treatment temperature of the second-stage heat strengthening treatment is 660 ℃, and the treatment time is 2.3h; the treatment temperature of the third-stage heat strengthening treatment is 770 ℃, and the treatment time is 1.2h; the tempering temperature of the tempering treatment in the step S1 is 550 ℃, and the heat preservation time is 1.5 hours; the annealing temperature of the annealing treatment is 740 ℃, and the heat preservation time is 1.2h.
Example 3
A high-strength material for fasteners comprises a body material and an anti-corrosion coating arranged on the outer surface of the body material; the body material is prepared from the following components in percentage by weight: 0.2% of C, 0.6% of Si, 1.6% of Mn, 0.25% of Zr, 0.025% of Ir, 0.35% of Ga, 0.003% of Sr, 0.7% of W, 0.002% of rare earth element, 0.004% of nano silicon boride, 0.002% of nano titanium nitride and the balance of Fe and other inevitable impurity elements; the anticorrosive coating is prepared from the following components in parts by weight: 45 parts of allylated hyperbranched polyphenyl ether, 13 parts of vinyl hyperbranched polysiloxane, 4 parts of methyl vinyl silafluorene, 2 parts of 2- (1-propylene-2-yl) benzo [ D ] oxazole, 3.5 parts of 2, 3-tetrafluoropropyl methacrylate, 13 parts of glass fiber, 2 parts of coupling agent, 1.5 parts of initiator and 35 parts of solvent.
The solvent is N, N-dimethylacetamide; the initiator is at least one of azobisisoheptonitrile and azobisisobutyronitrile; the coupling agent is a silane coupling agent KH560; the glass fiber is alkali-free glass fiber, the average diameter of the glass fiber is 5 μm, and the length-diameter ratio is 22.
The vinyl hyperbranched polysiloxane is prepared by the method of example 1 in CN 102276836B; the allylated hyperbranched polyphenylene oxide is prepared by the method of example 3 in CN 101717503B; the particle size of the nano silicon boride is 60nm, and the particle size of the nano titanium nitride is 20nm; the rare earth element is a mixture formed by mixing Pr and Ce according to a mass ratio of 3.
The thickness of the anticorrosive coating is 200 μm.
A preparation method of the high-strength material for the fastener comprises the following steps:
s1, smelting raw materials of Fe, fe-C intermediate alloy, fe-Si intermediate alloy, fe-Mn intermediate alloy, fe-Zr intermediate alloy, fe-Ir intermediate alloy, fe-Ga intermediate alloy, fe-Sr intermediate alloy, fe-W intermediate alloy, fe-Pr intermediate alloy and Fe-Ce intermediate alloy in a vacuum induction furnace, stirring after all the raw materials are completely melted to ensure that the alloy components are uniform, doping nano silicon boride and nano titanium nitride preheated to 800 ℃ into the molten alloy, stirring to ensure that the components are uniform, introducing the stirred and doped molten alloy into a mold in a nitrogen atmosphere for cooling, and demolding to obtain a high-strength material blank for a fastener; then sequentially carrying out heat strengthening treatment, tempering treatment and annealing treatment to obtain a body material;
and S2, uniformly mixing the components of the anticorrosive coating according to the parts by weight, coating the anticorrosive coating on the surface of the body material, curing at 100 ℃ for 2.5 hours, and curing at 180 ℃ for 0.8 hour to obtain the high-strength material for the fastener.
The heat strengthening treatment in the step S1 comprises a first stage heat strengthening treatment, a second stage heat strengthening treatment and a third stage heat strengthening treatment; the treatment temperature of the first-stage heat strengthening treatment is 630 ℃, and the treatment time is 1.5h; the treatment temperature of the second-stage heat strengthening treatment is 665 ℃, and the treatment time is 2.5h; the treatment temperature of the third-stage heat strengthening treatment is 790 ℃, and the treatment time is 1.5h.
The tempering temperature of the tempering treatment in the step S1 is 590 ℃, and the heat preservation time is 2 hours; the annealing temperature of the annealing treatment is 780 ℃, and the heat preservation time is 1.5h.
Example 4
A high-strength material for fasteners comprises a body material and an anti-corrosion coating arranged on the outer surface of the body material; the body material is prepared from the following components in percentage by weight: 0.25% of C, 0.8% of Si, 1.8% of Mn, 0.35% of Zr, 0.03% of Ir, 0.45% of Ga, 0.004% of Sr, 0.8% of W, 0.0025% of rare earth elements, 0.0045% of nano silicon boride, 0.0025% of nano titanium nitride and the balance of Fe and other inevitable impurity elements; the anticorrosive coating is prepared from the following components in parts by weight: 48 parts of allylated hyperbranched polyphenylene oxide, 14 parts of vinyl hyperbranched polysiloxane, 4.5 parts of methyl vinyl silafluorene, 2.5 parts of 2- (1-propylene-2-yl) benzo [ D ] oxazole, 4.5 parts of 2, 3-tetrafluoropropyl methacrylate, 14 parts of glass fiber, 2.5 parts of coupling agent, 1.8 parts of initiator and 38 parts of solvent.
The solvent is a mixture formed by mixing N, N-dimethylformamide, N-methylpyrrolidone and N, N-dimethylacetamide according to a mass ratio of 1; the initiator is a mixture formed by mixing azodiisoheptonitrile and azodiisobutyronitrile according to the mass ratio of 3; the coupling agent is a mixture formed by mixing a silane coupling agent KH550, a silane coupling agent KH560 and a silane coupling agent KH570 according to a mass ratio of 1;
the glass fiber is alkali-free glass fiber, the average diameter of the glass fiber is 4 μm, and the length-diameter ratio is 25; the vinyl hyperbranched polysiloxane is prepared by the method of example 1 in CN 102276836B; the allylated hyperbranched polyphenylene oxide is prepared by the method of example 3 in CN 101717503B; the particle size of the nano silicon boride is 60nm, and the particle size of the nano titanium nitride is 20nm; the rare earth element is a mixture formed by mixing Pr and Ce according to the mass ratio of 3.
The thickness of the anticorrosive coating is 200 μm.
A preparation method of the high-strength material for the fastener comprises the following steps:
s1, smelting raw materials Fe, fe-C intermediate alloy, fe-Si intermediate alloy, fe-Mn intermediate alloy, fe-Zr intermediate alloy, fe-Ir intermediate alloy, fe-Ga intermediate alloy, fe-Sr intermediate alloy, fe-W intermediate alloy, fe-Pr intermediate alloy and Fe-Ce intermediate alloy in a vacuum induction furnace, stirring after all the raw materials are completely melted to ensure that the alloy components are uniform, doping nano silicon boride and nano titanium nitride preheated to 830 ℃ into the molten alloy, stirring to ensure that the components are uniform, introducing the stirred and doped molten alloy into a mold under a nitrogen atmosphere for cooling, and demolding to obtain a high-strength material blank for a fastener; then sequentially carrying out heat strengthening treatment, tempering treatment and annealing treatment to obtain a body material;
and S2, uniformly mixing the components of the anticorrosive coating according to the parts by weight, coating the anticorrosive coating on the surface of the body material, curing at 105 ℃ for 2.8 hours, and curing at 190 ℃ for 0.9 hour to obtain the high-strength material for the fastener.
The heat strengthening treatment in the step S1 comprises a first stage heat strengthening treatment, a second stage heat strengthening treatment and a third stage heat strengthening treatment; the treatment temperature of the first-stage heat strengthening treatment is 635 ℃, and the treatment time is 1.8h; the treatment temperature of the second-stage heat strengthening treatment is 675 ℃, and the treatment time is 2.8h; the treatment temperature of the third-stage heat strengthening treatment is 810 ℃, and the treatment time is 1.8h; the tempering temperature of the tempering treatment in the step S1 is 640 ℃, and the heat preservation time is 2.5 hours; the annealing temperature of the annealing treatment is 840 ℃, and the heat preservation time is 1.9h.
Example 5
A high-strength material for fasteners comprises a body material and an anti-corrosion coating arranged on the outer surface of the body material; the body material is prepared from the following components in percentage by weight: 0.3% of C, 0.9% of Si, 2.0% of Mn, 0.4% of Zr, 0.04% of Ir, 0.5% of Ga, 0.005% of Sr, 0.9% of W, 0.003% of rare earth element, 0.005% of nano silicon boride, 0.003% of nano titanium nitride and the balance of Fe and other inevitable impurity elements; the anticorrosive coating is prepared from the following components in parts by weight: 50 parts of allylated hyperbranched polyphenylene oxide, 15 parts of vinyl hyperbranched polysiloxane, 5 parts of methyl vinyl silafluorene, 3 parts of 2- (1-propylene-2-yl) benzo [ D ] oxazole, 5 parts of 2, 3-tetrafluoropropyl methacrylate, 15 parts of glass fiber, 3 parts of coupling agent, 2 parts of initiator and 40 parts of solvent.
The solvent is N-methyl pyrrolidone; the initiator is azobisisoheptonitrile; the coupling agent is a silane coupling agent KH570; the glass fiber is alkali-free glass fiber, the average diameter of the glass fiber is 3 μm, and the length-diameter ratio is 27; the vinyl hyperbranched polysiloxane is prepared by the method of example 1 in CN 102276836B; the allylated hyperbranched polyphenylene oxide is prepared by the method of example 3 in CN 101717503B; the particle size of the nano silicon boride is 60nm, and the particle size of the nano titanium nitride is 20nm; the rare earth element is a mixture formed by mixing Pr and Ce according to the mass ratio of 3.
The thickness of the anti-corrosion coating is 200 mu m.
A preparation method of the high-strength material for the fastener comprises the following steps:
s1, smelting raw materials of Fe, fe-C intermediate alloy, fe-Si intermediate alloy, fe-Mn intermediate alloy, fe-Zr intermediate alloy, fe-Ir intermediate alloy, fe-Ga intermediate alloy, fe-Sr intermediate alloy, fe-W intermediate alloy, fe-Pr intermediate alloy and Fe-Ce intermediate alloy in a vacuum induction furnace, stirring after all the raw materials are completely melted to ensure that the alloy components are uniform, doping nano silicon boride and nano titanium nitride preheated to 850 ℃ into the molten alloy, stirring to ensure that the components are uniform, introducing the stirred and doped molten alloy into a mold in a nitrogen atmosphere for cooling, and demolding to obtain a high-strength material blank for a fastener; then sequentially carrying out heat strengthening treatment, tempering treatment and annealing treatment to obtain a body material;
and S2, uniformly mixing all components of the anticorrosive coating according to parts by weight, coating the anticorrosive coating on the surface of the body material, curing at 110 ℃ for 3 hours, and curing at 200 ℃ for 1 hour to obtain the high-strength material for the fastener.
The heat strengthening treatment in the step S1 comprises a first stage heat strengthening treatment, a second stage heat strengthening treatment and a third stage heat strengthening treatment; the treatment temperature of the first-stage heat strengthening treatment is 640 ℃, and the treatment time is 2h; the treatment temperature of the second-stage heat strengthening treatment is 680 ℃, and the treatment time is 3h; the treatment temperature of the third-stage heat strengthening treatment is 820 ℃, and the treatment time is 2h; the tempering temperature of the tempering treatment in the step S1 is 650 ℃, and the heat preservation time is 3 hours; the annealing temperature of the annealing treatment is 850 ℃, and the heat preservation time is 2h.
Comparative example 1
The present invention provides a high strength material for fasteners similar to example 1, except that there is no Ir, ga, nano silicon boride and 2- (1-propen-2-yl) benzo [ D ] oxazole.
Comparative example 2
The present invention provides a high strength material for fasteners similar to example 1, except that there is no Sr, W, nano titanium nitride and methylvinylsilfluorene.
In order to further illustrate the beneficial technical effects of the high-strength material for the fastener made by each embodiment of the invention, the high-strength material for the fastener made by each embodiment is subjected to relevant performance tests, the test results are shown in table 1, and the test methods are as follows:
(1) Determination of tensile Strength: the tensile properties of the samples were tested according to the national standards GB/T228-2002 and GB/T3098.1-2000.
(2) Evaluation of delayed fracture resistance: by immersing the fastener in a 15% (mass part) aqueous solution of HCl for 30 minutes, washing with water and drying, a certain load was applied, comparing the load in which no fracture occurred for more than 100 hours. In this case, the load at which no fracture occurred for 100 hours or more after the acid impregnation was divided by the maximum load at the time of the tensile test without the acid impregnation, and the obtained value was defined as the delayed fracture strength ratio, and the larger the value, the better the delayed fracture resistance.
(3) Evaluation of corrosion resistance: the prepared high-strength material for the fastener 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 duration of the high-strength material for the fastener (namely the duration of maintaining the high-strength material without rusting) determines the quality of the corrosion resistance.
TABLE 1 Performance test results for high-strength materials for fasteners
| Item | Tensile strength (MPa) | Delayed fracture strength ratio | Corrosion resistance (h) |
| Example 1 | 1498 | 0.95 | 1216 |
| Example 2 | 1511 | 0.97 | 1228 |
| Example 3 | 1527 | 0.98 | 1236 |
| Example 4 | 1537 | 0.99 | 1246 |
| Example 5 | 1544 | 0.99 | 1253 |
| Comparative example 1 | 1336 | 0.90 | 1084 |
| Comparative example 2 | 1379 | 0.86 | 1067 |
As can be seen from table 1, the high-strength material for fasteners disclosed in the examples of the present invention has more excellent tensile strength, delayed fracture resistance and corrosion resistance than the comparative example product, and the addition of Ir, ga, sr, W, nano silicon boride, nano titanium nitride, methylvinylsilfluorene and 2- (1-propen-2-yl) benzo [ D ] oxazole is advantageous in improving the above properties.
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 various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A high-strength material for fasteners is characterized by comprising a body material and an anti-corrosion coating arranged on the outer surface of the body material; the body material is prepared from the following components in percentage by weight: 0.1 to 0.3 percent of C, 0.4 to 0.9 percent of Si, 1.1 to 2.0 percent of Mn, 0.1 to 0.4 percent of Zr, 0.01 to 0.04 percent of Ir, 0.2 to 0.5 percent of Ga, 0.001 to 0.005 percent of Sr, 0.5 to 0.9 percent of W, 0.001 to 0.003 percent of rare earth element, 0.003 to 0.005 percent of nano silicon boride, 0.001 to 0.003 percent of nano titanium nitride, and the balance of Fe and other inevitable impurity elements; the anticorrosive coating is prepared from the following components in parts by weight: 40-50 parts of allylated hyperbranched polyphenylene oxide, 10-15 parts of vinyl hyperbranched polysiloxane, 3-5 parts of methyl vinyl silafluorene, 1-3 parts of 2- (1-propylene-2-yl) benzo [ D ] oxazole, 2-5 parts of 2, 3-tetrafluoropropyl methacrylate, 10-15 parts of glass fiber, 1-3 parts of coupling agent, 1-2 parts of initiator and 30-40 parts of solvent.
2. The high-strength material for fasteners as claimed in claim 1, wherein the solvent is at least one of N, N-dimethylformamide, N-methylpyrrolidone, N-dimethylacetamide; the initiator is at least one of azobisisoheptonitrile and azobisisobutyronitrile; the coupling agent is at least one of a silane coupling agent KH550, a silane coupling agent KH560 and a silane coupling agent KH 570.
3. The high-strength material for fasteners as claimed in claim 1, wherein the glass fiber is alkali-free glass fiber, the glass fiber has an average diameter of 3 to 8 μm and an aspect ratio of (16 to 27): 1.
4. The high-strength material for fasteners as claimed in claim 1, wherein the nano silicon boride has a particle size of 60nm and the nano titanium nitride has a particle size of 20nm.
5. The high-strength material for fasteners as claimed in claim 1, wherein the rare earth element is a mixture of Pr and Ce in a mass ratio of 3 (3-5).
6. The high-strength material for fasteners as claimed in claim 1, wherein the thickness of the corrosion-resistant coating layer is 100-300 μm.
7. A method for preparing a high-strength material for fasteners according to any one of claims 1 to 6, comprising the steps of:
s1, smelting raw materials of Fe, fe-C intermediate alloy, fe-Si intermediate alloy, fe-Mn intermediate alloy, fe-Zr intermediate alloy, fe-Ir intermediate alloy, fe-Ga intermediate alloy, fe-Sr intermediate alloy, fe-W intermediate alloy, fe-Pr intermediate alloy and Fe-Ce intermediate alloy in a vacuum induction furnace, stirring after all the raw materials are completely melted to ensure that the alloy components are uniform, doping nano silicon boride and nano titanium nitride preheated to 750-850 ℃ into the molten alloy, stirring to ensure that the components are uniform, introducing the stirred and doped molten alloy into a mold under the nitrogen atmosphere for cooling, and demolding to obtain a high-strength material blank for a fastener; then sequentially carrying out heat strengthening treatment, tempering treatment and annealing treatment to obtain a body material;
and S2, uniformly mixing the components of the anticorrosive coating according to the parts by weight, coating the anticorrosive coating on the surface of the body material, curing for 2-3 hours at the temperature of 90-110 ℃, and curing for 0.5-1 hour at the temperature of 160-200 ℃ to obtain the high-strength material for the fastener.
8. The method for manufacturing a high-strength material for fasteners according to claim 7, wherein the heat-strengthening treatment in step S1 includes a first-stage heat-strengthening treatment, a second-stage heat-strengthening treatment, and a third-stage heat-strengthening treatment; the treatment temperature of the first-stage heat strengthening treatment is 620-640 ℃, and the treatment time is 1-2 h; the processing temperature of the second-stage heat strengthening treatment is 650-680 ℃, and the processing time is 2-3 h; the processing temperature of the third-stage heat strengthening treatment is 750-820 ℃, and the processing time is 1-2h.
9. The method for preparing a high-strength material for fasteners according to claim 7, wherein the tempering temperature of the tempering treatment in step S1 is 500-650 ℃, and the holding time is 1-3 hours; the annealing temperature of the annealing treatment is 700-850 ℃, and the heat preservation time is 1-2h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116426829A (en) * | 2023-04-27 | 2023-07-14 | 宁波楦利高强度紧固件有限公司 | Anti-fatigue durable fastener material and preparation method thereof |
| CN116555674A (en) * | 2023-05-22 | 2023-08-08 | 宁波市鄞州宁东齿轮有限公司 | Corrosion-resistant gear and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116426829A (en) * | 2023-04-27 | 2023-07-14 | 宁波楦利高强度紧固件有限公司 | Anti-fatigue durable fastener material and preparation method thereof |
| CN116426829B (en) * | 2023-04-27 | 2024-01-02 | 宁波楦利高强度紧固件有限公司 | Anti-fatigue durable fastener material and preparation method thereof |
| CN116555674A (en) * | 2023-05-22 | 2023-08-08 | 宁波市鄞州宁东齿轮有限公司 | Corrosion-resistant gear and preparation method thereof |
| CN116555674B (en) * | 2023-05-22 | 2024-03-15 | 宁波市鄞州宁东齿轮有限公司 | Corrosion-resistant gear and preparation method thereof |
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