CN111118406B - Manufacturing method of marine atmospheric corrosion resistant high-strength bolt - Google Patents
Manufacturing method of marine atmospheric corrosion resistant high-strength bolt Download PDFInfo
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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
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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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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Abstract
The invention discloses a marine atmospheric corrosion resistant high-strength bolt which comprises the following components in percentage by mass: 0.10 to 0.40; si: 0.10 to 0.60; mn: 0.30 to 1.20; p is less than or equal to 0.025; s is less than or equal to 0.01; ni: 3.0 to 3.5; cu: 0.20 to 0.70; mo: 0.10 to 0.65; v: less than or equal to 0.10; ti: 0.02-0.10: b: 0.001 to 0.003; nb: 0.04 to 0.10; als is more than or equal to 0.015; n: 0.009-0.018; w: 0.1 to 0.8; zr: 0.015 to 0.045. The invention also discloses a manufacturing method of the marine atmospheric corrosion resistant high-strength bolt. The tensile strength of the bolt manufactured by the method is 1075-1200 MPa, and the bolt has an excellent marine atmosphere corrosion resistance.
Description
Technical Field
The invention relates to a marine atmospheric corrosion resistant high-strength bolt and a manufacturing method thereof, belonging to the technical field of alloy materials.
Background
With the continuous development of coastal areas, increasingly higher requirements are put on materials used by various fasteners (such as bolts, screws, nuts and the like), such as high reinforcement of the bolts, marine atmospheric corrosion resistance and the like. Compared with the common atmospheric environment, the marine atmospheric environment has higher chloride ion concentration and more complex environment, causes certain resistance to the development of China to the marine field, and further accelerates the corrosion rate of metal materials due to severe environmental factors. The metal corrosion in coastal areas can directly or indirectly bring serious economic loss to China every year, and the traditional 42CrMo and 42CrMo4 bolt steel has poor marine atmospheric corrosion resistance and can not meet the long-term use requirement in coastal areas, so the most effective mode is to improve the marine atmospheric corrosion resistance of metal materials.
Disclosure of Invention
The invention aims to solve the technical problem of providing a marine atmospheric corrosion resistant high-strength bolt and a manufacturing method thereof.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a marine atmospheric corrosion resistant high-strength bolt comprises the following components in percentage by mass: 0.10 to 0.40; si: 0.10 to 0.60; mn: 0.30 to 1.20; p is less than or equal to 0.025; s is less than or equal to 0.01; ni: 3.0 to 3.5; cu: 0.20 to 0.70; mo: 0.10 to 0.65; v: less than or equal to 0.10; ti: 0.02-0.10: b: 0.001 to 0.003; nb: 0.04 to 0.10; als is more than or equal to 0.015; n: 0.009-0.018; w: 0.1 to 0.8; zr: 0.015 to 0.045; re: 0.01~0.045, gas content in the bolt: the content of N is less than or equal to 0.008 percent, the content of H is less than or equal to 0.0002 percent, and the balance is Fe.
The tensile strength and the corrosion resistance of the bolt can be further improved by adding two rare earth elements of Zr and Re into the bolt component.
A manufacturing method of a marine atmospheric corrosion resistant high-strength bolt comprises the following steps:
s01, hot forging and forming;
s02, precipitated phase adjustment: heating and insulating the bolt formed by S01 at 1100-1250 ℃ for 45-60 min, and rapidly cooling in air after the insulation is finished, so that fine second-phase particles are dispersed and separated out and distributed on the tissue matrix of the bolt fully and uniformly;
s03, high-temperature quenching: after precipitated phase adjustment treatment, high-temperature quenching is adopted, heating is carried out at 960-1000 ℃ to enable austenitization, and oil quenching is carried out after heat preservation is carried out for 45-60 min;
s04, two-stage tempering: the temperature of the first stage tempering is 350-450 ℃, the temperature is kept for 30-50 min, copper-rich phase (-Cu) is mainly precipitated in the first stage tempering, the first stage tempering is not cooled, the temperature is continuously raised to 560-610 ℃, the temperature is kept for 60-100 min, namely the second stage tempering, and fine second phase special carbides formed by V, Nb, Ti, W and other elements are mainly precipitated in the second stage tempering;
and S05, machining, rolling and surface phosphating.
The hot forging forming can be replaced by spheroidizing annealing cold heading forming.
The second phase particles include Ti (C, N), V (C, N), Nb (C, N), and W2C。
The cooling rate of the rapid air cooling is 1.5-4 ℃/s.
The particle size range of the second phase particles is 0.5-10 nm.
The invention provides a first-stage tempering process flow of precipitated phase adjustment treatment, high-temperature quenching and two-stage tempering, and copper-rich phases (-Cu) and Ti (C, N), V (C, N), Nb (C, N) and W (W) can be fully dispersed and precipitated in a tempered structure after the process flow2Fine second phase particles such as C are fully separated out, so that the bolt is realizedAt the strength level of 1040MPa, still has higher marine atmospheric corrosion resistance and good plasticity and toughness.
The precipitated phase adjustment treatment is that according to the characteristic that the dissolution temperature of carbides or carbon and nitrogen compounds of alloy elements such as V, Nb, Ti, W and the like in steel is high, heating and heat preservation are carried out for 45-60 min at 1100-1250 ℃, so that the alloy elements such as W, V, Nb, Ti and the like in the steel are fully dissolved in austenite, fine second-phase particles such as Ti (C, N), V (C, N), Nb (C, N) and the like are fully and uniformly dispersed and precipitated and distributed on a tissue matrix in the process of rapidly air-cooling to room temperature after the heat preservation is finished, the fine dispersed second-phase particles can play a role in pinning grain boundaries in the process of reheating high-temperature quenching heat preservation, the growth of austenite grains can be effectively hindered, and meanwhile, the original tissue can be improved and the tissue uniformity can be improved.
After the adjustment treatment of the precipitated phase, rapidly air-cooling to room temperature, then quenching at high temperature, and heating to austenitize at 960-1000 ℃ to completely or partially dissolve the alloy elements such as Ni, Mo, Cu, V, Ti, W, etc. in the steel into austenite, and quenching and cooling to obtain martensite with high alloy content.
After quenching and cooling to room temperature, carrying out two-stage tempering, selecting the first-stage tempering temperature to be 350-450 ℃, and carrying out heat preservation for 30-50 min, wherein the purpose is to separate out a copper-rich phase (-Cu) in the tempering and heating process at 350-450 ℃, simultaneously, the separation of carbides of elements such as W, V, Nb and Ti can be induced during the precipitation separation of Cu elements and the segregation of Cu elements, after the first-stage tempering is finished, continuously heating to 560-610 ℃ without cooling to carry out high-temperature tempering, and carrying out heat preservation for 60-100 min (second-stage tempering). The high temperature tempering at 560-610 ℃ is to form fine second phase special carbides of V, Nb, Ti, W and other elements to perform precipitation strengthening (secondary hardening) and improve the strength of the steel.
The second phase special carbide comprises TiC, VC, NbC and W2C。
W element is used as a strong carbide forming element, the bonding force with carbon is stronger than that of Mo element, tungsten element dissolved in a matrix during high-temperature quenching is mainly separated out during tempering at 560-610 DEG C2C, and more Mo element is remained inIn the matrix structure, the matrix structure keeps higher corrosion resistance, and tungsten carbide formed by tempering is not easy to aggregate and grow up during high-temperature tempering, is dispersed and distributed on a martensite matrix, and can improve the mechanical property of the bolt together with carbides of other elements to cause secondary hardening effect.
Higher Ni element, proper Mo and Cu element are added into the bolt, so that a passive film can be formed on the surface of bolt steel, electrochemical corrosion is reduced, and the marine atmospheric corrosion resistance of the bolt steel is improved. In view of the adopted processes of precipitated phase adjustment treatment, high-temperature quenching, two-stage tempering and the like, corresponding alloy elements fully play a synergistic effect, the effects of fine-grain strengthening, precipitation strengthening, passive film formation promotion and the like are achieved, a tempered martensite structure is finally formed after the two-stage tempering is finished, and the strength, the toughness and the plasticity and the marine atmosphere corrosion resistance of the bolt are improved.
The Cu element is added into the steel to form a secondary precipitation product on the surface of the steel, the secondary precipitation product is used as a cathode to generate anode purification on the surface of steel, the Cu is enriched in the rust layer in a CuO form in the weathering steel, a corrosive medium can be well isolated, the promotion effect of Cl ions on corrosion is relieved, the polarization resistance of the steel is increased, and the protection of the rust layer is enhanced, so that the marine atmospheric corrosion performance of the steel is improved, and meanwhile, the addition of the Cu and Ni alloy elements can accelerate the cathode reduction of the rust layer, inhibit the anode dissolution and improve the corrosion resistance of the steel. The rare earth element Re can purify molten steel, deoxidize and desulfurize, gradually transform band-shaped manganese sulfide inclusion in the steel into spherical and dispersedly distributed rare earth inclusion, refine the structure and improve the mechanical property, and the rare earth element improves the atmospheric corrosion resistance of the steel mainly by compacting a rust layer and enhancing the adhesive force of the rust layer and a steel matrix. Function of Mo element: the compactness and the adhesive force of the rust layer are improved, the formation of an amorphous oxidation film is promoted to improve the property of the rust layer, the invasion of Cl ions is effectively inhibited, and the corrosion resistance of the test steel is improved. The existence of Ni in the steel can make the self-corrosion potential of the steel move forward, thereby increasing the stability of the steel, promoting the formation of a superparamagnetic alpha-FeOOH phase with the particle size of less than 15nm in the inner rust layer, and further increasing the compactness of the inner rust layer, thereby improving the capability of resisting marine atmospheric corrosion.
The tensile strength of the 1040MPa grade high-strength bolt manufactured by the invention is 1075 MPa-1200 MPa, the elongation after fracture is more than or equal to 12.5%, the reduction of area is 50% -60%, and the impact energy at minus 20 ℃ is more than 41KV2The alloy has excellent marine atmospheric corrosion resistance.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail with reference to the following embodiments. The specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting.
Example 1
A marine atmospheric corrosion resistant high-strength bolt comprises the following components in percentage by mass: 0.10; si: 0.10; mn: 0.30; p: 0.025; s: 0.01; ni: 3.0; cu: 0.20; mo: 0.10; v: 0.10; ti: 0.02: b: 0.001; nb: 0.04; and Als: 0.015; n: 0.009; w: 0.1; zr: 0.015; re: 0.01, gas content in bolt: the content of N is less than or equal to 0.008 percent, the content of H is less than or equal to 0.0002 percent, and the balance is Fe.
A manufacturing method of a marine atmospheric corrosion resistant high-strength bolt comprises the following steps:
s01, hot forging and forming;
s02, precipitated phase adjustment: heating and insulating the bolt formed by S01 at 1100 ℃ for 45min, and rapidly cooling in air after the insulation is finished, so that fine second-phase particles are fully and uniformly dispersed and separated out and distributed on the tissue matrix of the bolt;
s03, high-temperature quenching: quenching at high temperature after precipitated phase adjustment treatment, heating at 960 deg.C to austenitize, and oil quenching after 45 min;
s04, two-stage tempering: the tempering temperature in the first stage is 350-450 ℃, the temperature is kept for 30-50 min, and copper-rich phases (-Cu) are mainly precipitated in the first stage; after the first stage tempering is finished, cooling is not carried out, the temperature is continuously increased to 570 ℃, and then the temperature is kept for 100min, namely the second stage tempering, wherein fine second-phase special carbides formed by V, Nb, Ti, W and other elements are mainly precipitated in the second stage tempering;
and S05, machining, rolling and surface phosphating.
The second phase particles include Ti (C, N), V (C, N), Nb (C, N), and W2C。
The cooling rate of the rapid air cooling is 2 ℃/s.
The particle size range of the second phase particles is 0.5-10 nm.
The second phase special carbide comprises TiC, VC, NbC and W2C。
After the process, the tensile strength of the bolt is 1089MPa, the reduction of area is 56.2 percent, and the impact energy at minus 20 ℃ is more than 77.8KV2/J。
In the embodiment, the Cu element is added into the steel to form a secondary precipitation product on the surface of the steel, the secondary precipitation product is used as a cathode to generate anode purification on the surface of the steel, and the Cu is enriched in an inner rust layer of the weathering steel to further reduce Cl-1Accelerating the corrosion of steel, lower Ni concentration can improve the HSO resistance3 -1The corrosion of the steel is accelerated by adding Cu and Ni alloy elements, the cathode reduction of the rust layer is accelerated, the anode dissolution is inhibited, and the corrosion resistance of the steel is improved. The rare earth element Re can purify molten steel, deoxidize and desulfurize, gradually transform band-shaped manganese sulfide inclusion in the steel into spherical and dispersedly distributed rare earth inclusion, refine the structure and improve the mechanical property, and the rare earth element can improve the atmospheric corrosion resistance of the steel mainly by compacting a rust layer and enhancing the adhesive force of the rust layer and a steel matrix.
The marine atmospheric corrosion resistance test is carried out according to the salt fog test of artificial atmosphere corrosion test (GB/T10125-2012/ISO 9227: 2006), and the main test conditions comprise: the uniform spraying concentration is 50 g.L-1±5g·L-1The pH value of the sodium chloride solution is 6.5-7.2, the temperature in a test box is kept at 35 +/-2 ℃, and the salt spray is 80cm2The average sedimentation rate in the horizontal area of (1.5 mL · h)-1±0.5mL·h-1The test period was set to 2, 4, 8, 12, 18, 25 days. The thickness loss was controlled to be 60 to 90 μm at the test period of 18 and 25 days.
Open circuit potential determination (self-corrosion potential) was performed using electrochemical test methods: the electrochemical test device adopts a three-electrode system and a working electrode(i.e. research electrode) is a sample to be tested, and the working area is 1cm2(ii) a The reference electrode is a saturated calomel electrode; the auxiliary electrode is a platinum sheet or a platinum wire mesh. The test solution was NaCl solution at a concentration of (3.50. + -. 0.05)%. The test temperature was room temperature. The self-corrosion potential is controlled to-0.605V to-0.630V.
Example 2
A marine atmospheric corrosion resistant high-strength bolt comprises the following components in percentage by mass: 0.40; si: 0.60; mn: 1.20; p: 0.020; s: 0.005; ni: 3.5; cu: 0.70; mo: 0.65; v: 0.05; ti: 0.10: b: 0.003; nb: 0.10; and Als: 0.02; n: 0.018; w: 0.8; zr: 0.045; re: 0.045, gas content in the bolt: the content of N is less than or equal to 0.008 percent, the content of H is less than or equal to 0.0002 percent, and the balance is Fe.
A manufacturing method of a marine atmospheric corrosion resistant high-strength bolt comprises the following steps:
s01, spheroidizing annealing and cold heading forming;
s02, precipitated phase adjustment: heating and insulating the bolt formed by S01 at 1100 ℃ for 45min, and rapidly cooling in air after the insulation is finished, so that fine second-phase particles are fully and uniformly dispersed and separated out and distributed on the tissue matrix of the bolt;
s03, high-temperature quenching: quenching at high temperature after precipitated phase adjustment treatment, heating at 960 deg.C to austenitize, and oil quenching after 45 min;
s04, two-stage tempering: the tempering temperature in the first stage is 350-450 ℃, the temperature is kept for 30-50 min, and copper-rich phases (-Cu) are mainly precipitated in the first stage; after the first stage tempering is finished, cooling is not carried out, the temperature is continuously increased to 580 ℃, and then heat preservation is carried out for 100min, namely the second stage tempering is carried out, wherein fine second-phase special carbides formed by V, Nb, Ti, W and other elements are mainly precipitated in the second stage tempering;
and S05, machining, rolling and surface phosphating.
The second phase particles include Ti (C, N), V (C, N), Nb (C, N), and W2C。
The cooling rate of the rapid air cooling is 4 ℃/s.
The particle size range of the second phase particles is 0.5-10 nm.
The second phase special carbide comprises TiC, VC, NbC and W2C。
After the process, the tensile strength of the bolt is 1045MPa, the reduction of area is 58.3 percent, and the impact energy at minus 20 ℃ is more than 82.1KV2/J。
Example 3
A marine atmospheric corrosion resistant high-strength bolt comprises the following components in percentage by mass: 0.20; si: 0.30; mn: 0.80; p: 0.01; s: 0.001; ni: 3.3; cu: 0.50; mo: 0.35; v: 0.010; ti: 0.09: b: 0.002; nb: 0.08; and Als: 0.03; n: 0.015; w: 0.5; zr: 0.03; re: 0.03, gas content in the bolt: the content of N is less than or equal to 0.008 percent, the content of H is less than or equal to 0.0002 percent, and the balance is Fe.
A manufacturing method of a marine atmospheric corrosion resistant high-strength bolt comprises the following steps:
s01, hot forging and forming;
s02, precipitated phase adjustment: heating and insulating the bolt formed in S01 at 1150 ℃ for 45min, and rapidly air-cooling after the insulation is finished to ensure that fine second-phase particles are fully and uniformly dispersed and separated out and distributed on the tissue matrix of the bolt;
s03, high-temperature quenching: high-temperature quenching is adopted after precipitated phase adjustment treatment, heating is carried out at 980 ℃ to enable austenitization, and oil quenching is carried out after heat preservation is carried out for 45 min;
s04, two-stage tempering: the tempering temperature in the first stage is 350-450 ℃, the temperature is kept for 30-50 min, and copper-rich phases (-Cu) are mainly precipitated in the first stage; after the first stage tempering is finished, cooling is not carried out, the temperature is continuously increased to 570 ℃, and then the temperature is kept for 100min, namely the second stage tempering, wherein fine second-phase special carbides formed by V, Nb, Ti, W and other elements are mainly precipitated in the second stage tempering;
and S05, machining, rolling and surface phosphating.
The second phase particles include Ti (C, N), V (C, N), Nb (C, N), and W2C。
The cooling rate of the rapid air cooling is 3 ℃/s.
The particle size range of the second phase particles is 0.5-10 nm.
The secondThe phase specific carbide includes TiC, VC, NbC and W2C。
After the process, the tensile strength of the bolt is 1070MPa, the reduction of area is 58.3 percent, and the impact energy at minus 20 ℃ is more than 46.7KV2/J。
Example 4
A marine atmospheric corrosion resistant high-strength bolt comprises the following components in percentage by mass: 0.10 to 0.40; si: 0.10 to 0.60; mn: 0.30 to 1.20; p is less than or equal to 0.025; s is less than or equal to 0.01; ni: 3.0 to 3.5; cu: 0.20 to 0.70; mo: 0.10 to 0.65; v: less than or equal to 0.10; ti: 0.02-0.10: b: 0.001 to 0.003; nb: 0.04 to 0.10; als is more than or equal to 0.015; n: 0.009-0.018; w: 0.1 to 0.8; zr: 0.015 to 0.045; re: 0.01~0.045, gas content in the bolt: the content of N is less than or equal to 0.008 percent, the content of H is less than or equal to 0.0002 percent, and the balance is Fe.
A manufacturing method of a marine atmospheric corrosion resistant high-strength bolt comprises the following steps:
s01, hot forging and forming;
s02, precipitated phase adjustment: heating and insulating the bolt formed in S01 at 1150 ℃ for 45min, and rapidly air-cooling after the insulation is finished to ensure that fine second-phase particles are fully and uniformly dispersed and separated out and distributed on the tissue matrix of the bolt;
s03, high-temperature quenching: quenching at high temperature after precipitated phase adjustment treatment, heating at 960 deg.C to austenitize, and oil quenching after 45 min;
s04, two-stage tempering: the tempering temperature in the first stage is 350-450 ℃, the temperature is kept for 30-50 min, and copper-rich phases (-Cu) are mainly precipitated in the first stage; after the first stage tempering is finished, cooling is not carried out, the temperature is continuously increased to 570 ℃, and then the temperature is kept for 100min, namely the second stage tempering, wherein fine second-phase special carbides formed by V, Nb, Ti, W and other elements are mainly precipitated in the second stage tempering;
and S05, machining, rolling and surface phosphating.
The second phase particles include Ti (C, N), V (C, N), Nb (C, N), and W2C。
The cooling rate of the rapid air cooling is 1.5-4 ℃/s.
The particle size range of the second phase particles is 0.5-10 nm.
The second phase special carbide comprises TiC, VC, NbC and W2C。
After the process, the tensile strength of the bolt is 1082MPa, the reduction of area is 57.5 percent, and the impact energy at minus 20 ℃ is more than 54.6KV2/J。
Example 5
A marine atmospheric corrosion resistant high-strength bolt comprises the following components in percentage by mass: 0.10 to 0.40; si: 0.10 to 0.60; mn: 0.30 to 1.20; p is less than or equal to 0.025; s is less than or equal to 0.01; ni: 3.0 to 3.5; cu: 0.20 to 0.70; mo: 0.10 to 0.65; v: less than or equal to 0.10; ti: 0.02-0.10: b: 0.001 to 0.003; nb: 0.04 to 0.10; als is more than or equal to 0.015; n: 0.009-0.018; w: 0.1 to 0.8; zr: 0.015 to 0.045; re: 0.01~0.045, gas content in the bolt: the content of N is less than or equal to 0.008 percent, the content of H is less than or equal to 0.0002 percent, and the balance is Fe.
A manufacturing method of a high-strength bolt resistant to marine atmospheric corrosion is characterized by comprising the following steps: the method comprises the following steps:
s01, hot forging and forming;
s02, precipitated phase adjustment: heating and insulating the bolt formed in S01 at 1150 ℃ for 45min, and rapidly air-cooling after the insulation is finished to ensure that fine second-phase particles are fully and uniformly dispersed and separated out and distributed on the tissue matrix of the bolt;
s03, high-temperature quenching: after the precipitated phase is adjusted, high-temperature quenching is adopted, heating is carried out at 970 ℃ to enable austenitization, and oil quenching is carried out after heat preservation is carried out for 45 min;
s04, two-stage tempering: the tempering temperature in the first stage is 350-450 ℃, the temperature is kept for 30-50 min, and copper-rich phases (-Cu) are mainly precipitated in the first stage; after the first stage tempering is finished, cooling is not carried out, the temperature is continuously increased to 580 ℃, and then heat preservation is carried out for 100min, namely the second stage tempering is carried out, wherein fine second-phase special carbides formed by V, Nb, Ti, W and other elements are mainly precipitated in the second stage tempering;
and S05, machining, rolling and surface phosphating.
The second phase particles include Ti (C, N), V (C, N), Nb (C, N), and W2C。
The cooling rate of the rapid air cooling is 1.5-4 ℃/s.
The particle size range of the second phase particles is 0.5-10 nm.
The second phase special carbide comprises TiC, VC, NbC and W2C。
After the process, the tensile strength of the bolt is 1072MPa, the reduction of area is 57.7 percent, and the impact energy at minus 20 ℃ is more than 55KV2/J。
Example 6
A marine atmospheric corrosion resistant high-strength bolt comprises the following components in percentage by mass: 0.10 to 0.40; si: 0.10 to 0.60; mn: 0.30 to 1.20; p is less than or equal to 0.025; s is less than or equal to 0.01; ni: 3.0 to 3.5; cu: 0.20 to 0.70; mo: 0.10 to 0.65; v: less than or equal to 0.10; ti: 0.02-0.10: b: 0.001 to 0.003; nb: 0.04 to 0.10; als is more than or equal to 0.015; n: 0.009-0.018; w: 0.1 to 0.8; zr: 0.015 to 0.045; re: 0.01~0.045, gas content in the bolt: the content of N is less than or equal to 0.008 percent, the content of H is less than or equal to 0.0002 percent, and the balance is Fe.
A manufacturing method of a marine atmospheric corrosion resistant high-strength bolt comprises the following steps:
s01, hot forging and forming;
s02, precipitated phase adjustment: heating and insulating the bolt formed by S01 at 1200 ℃ for 45min, and rapidly cooling in air after the insulation is finished, so that fine second-phase particles are fully and uniformly dispersed and separated out and distributed on the tissue matrix of the bolt;
s03, high-temperature quenching: quenching at high temperature after precipitated phase adjustment treatment, heating at 960 deg.C to austenitize, and oil quenching after 45 min;
s04, two-stage tempering: the tempering temperature in the first stage is 350-450 ℃, the temperature is kept for 30-50 min, and copper-rich phases (-Cu) are mainly precipitated in the first stage; after the first stage tempering is finished, cooling is not carried out, the temperature is continuously increased to 570 ℃, and then the temperature is kept for 100min, namely the second stage tempering, wherein fine second-phase special carbides formed by V, Nb, Ti, W and other elements are mainly precipitated in the second stage tempering;
and S05, machining, rolling and surface phosphating.
The second phase particles include Ti (C, N), V (C),N), Nb (C, N) and W2C。
The cooling rate of the rapid air cooling is 1.5-4 ℃/s.
The particle size range of the second phase particles is 0.5-10 nm.
The second phase special carbide comprises TiC, VC, NbC and W2C。
After the process, the tensile strength of the bolt is 1093MPa, the reduction of area is 56.8 percent, and the impact energy at minus 20 ℃ is more than 71.3KV2/J。
Example 7
A marine atmospheric corrosion resistant high-strength bolt comprises the following components in percentage by mass: 0.10 to 0.40; si: 0.10 to 0.60; mn: 0.30 to 1.20; p is less than or equal to 0.025; s is less than or equal to 0.01; ni: 3.0 to 3.5; cu: 0.20 to 0.70; mo: 0.10 to 0.65; v: less than or equal to 0.10; ti: 0.02-0.10: b: 0.001 to 0.003; nb: 0.04 to 0.10; als is more than or equal to 0.015; n: 0.009-0.018; w: 0.1 to 0.8; zr: 0.015 to 0.045; re: 0.01~0.045, gas content in the bolt: the content of N is less than or equal to 0.008 percent, the content of H is less than or equal to 0.0002 percent, and the balance is Fe.
A manufacturing method of a marine atmospheric corrosion resistant high-strength bolt comprises the following steps:
s01, hot forging and forming;
s02, precipitated phase adjustment: heating and insulating the bolt formed by S01 at 1250 ℃ for 60min, and rapidly cooling by air after the insulation is finished, so that fine second-phase particles are fully and uniformly dispersed, separated and distributed on the tissue matrix of the bolt;
s03, high-temperature quenching: high-temperature quenching is adopted after precipitated phase adjustment treatment, heating is carried out at 1000 ℃ to enable austenitization, and oil quenching is carried out after heat preservation is carried out for 60 min;
s04, two-stage tempering: the tempering temperature of the first stage is 350 ℃, the temperature is kept for 30min, and copper-rich phase (-Cu) is mainly separated out in the first stage; after the first stage tempering is finished, cooling is not carried out, the temperature is continuously increased to 610 ℃, and then the temperature is kept for 60min, namely the second stage tempering is carried out, wherein fine second-phase special carbides formed by V, Nb, Ti, W and other elements are mainly precipitated in the second stage tempering;
and S05, machining, rolling and surface phosphating.
The second phase particles include Ti (C, N), V (C, N), Nb (C, N), and W2C。
The cooling rate of the rapid air cooling is 1.5 ℃/s.
The particle size range of the second phase particles is 0.5-10 nm.
The second phase special carbide comprises TiC, VC, NbC and W2C。
Example 8
This example differs from example 7 only in that:
s04, two-stage tempering: the temperature of the first stage tempering is 450 ℃, the temperature is kept for 50min, the first stage tempering is finished without cooling, the temperature is continuously raised to 560 ℃, and the temperature is kept for 100min, namely the second stage tempering.
The foregoing shows and describes the general principles, essential 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 described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present 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 (6)
1. A manufacturing method of a marine atmospheric corrosion resistant high-strength bolt comprises the following components in percentage by mass: 0.10 to 0.40; si: 0.10 to 0.60; mn: 0.30 to 1.20; p is less than or equal to 0.025; s is less than or equal to 0.01; ni: 3.0 to 3.5; cu: 0.20 to 0.70; mo: 0.10 to 0.65; v: less than or equal to 0.10; ti: 0.02-0.10: b: 0.001 to 0.003; nb: 0.04 to 0.10; als is more than or equal to 0.015; n: 0.009-0.018; w: 0.1 to 0.8; zr: 0.015 to 0.045; re: 0.01~0.045, gas content in the bolt: the content of [ N ] is less than or equal to 0.008 percent, the content of [ H ] is less than or equal to 0.0002 percent, and the balance is Fe;
the method is characterized in that: the manufacturing method comprises the following steps:
s01, hot forging and forming;
s02, precipitated phase adjustment: heating and insulating the bolt formed by S01 at 1100-1250 ℃ for 45-60 min, and rapidly cooling in air after the insulation is finished, so that fine second-phase particles are dispersed and separated out and distributed on the tissue matrix of the bolt fully and uniformly;
s03, high-temperature quenching: after precipitated phase adjustment treatment, high-temperature quenching is adopted, heating is carried out at 960-1000 ℃ to enable austenitization, and oil quenching is carried out after heat preservation is carried out for 45-60 min;
s04, two-stage tempering: the tempering temperature in the first stage is 350-450 ℃, the temperature is kept for 30-50 min, and copper-rich phase-Cu is separated out in the first stage; after the first-stage tempering is finished, cooling is not carried out, the temperature is continuously increased to 560-610 ℃, and then the temperature is kept for 60-100 min, namely the second-stage tempering is carried out, and fine second-phase special carbides formed by V, Nb, Ti and W elements are separated out in the second-stage tempering;
and S05, machining, rolling and surface phosphating.
2. The method for manufacturing the marine atmospheric corrosion resistant high-strength bolt according to claim 1, wherein the method comprises the following steps: the hot forging forming can be replaced by spheroidizing annealing cold heading forming.
3. The method for manufacturing the marine atmospheric corrosion resistant high-strength bolt according to claim 1, wherein the method comprises the following steps: the second phase particles include Ti (C, N), V (C, N), Nb (C, N), and W2C。
4. The method for manufacturing the marine atmospheric corrosion resistant high-strength bolt according to claim 1, wherein the method comprises the following steps: the cooling rate of the rapid air cooling is 1.5-4 ℃/s.
5. The method for manufacturing the marine atmospheric corrosion resistant high-strength bolt according to claim 1, wherein the method comprises the following steps: the particle size range of the second phase particles is 0.5-10 nm.
6. The method for manufacturing the marine atmospheric corrosion resistant high-strength bolt according to claim 1, wherein the method comprises the following steps: the second phase special carbide comprises TiC, VC, NbC and W2C。
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