CN105296876A - High-strength fastener steel containing nickel and copper and thermal treatment method for high-strength fastener steel - Google Patents
High-strength fastener steel containing nickel and copper and thermal treatment method for high-strength fastener steel Download PDFInfo
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Abstract
The invention discloses high-strength fastener steel containing nickel and copper and a thermal treatment method for high-strength fastener steel. The high-strength fastener steel comprises the following components in percentage by mass: 0.38-0.45% of C, 0.17-0.30% of Si, 0.60-0.80% of Mn, less than or equal to 0.010% of P, less than or equal to 0.010% of S, 0.90-1.20% of Cr, 0.15-0.22% of Mo, 0.05-0.15% of Ni, 0.10-0.20% of Cu, and the balance of Fe and inevitable impurities. According to the high-strength fastener steel, a tissue obtained by oil quenching and high-temperature tempering is a tempered sorbite tissue with performances as follows: tensile strength Rm equal to 1100-1135MPa, yield strength Rel equal to 980-1015MPa, elongation A equal to 14.5-17.2%, V notch impact energy Akv equal to 70-90J at 25 DEG C, and V notch impact energy Akv equal to 55-85J at (-)20 DEG C. The high-strength fastener steel has stable impact performance and relatively high strength, and can be used for manufacturing a high-strength fastener with delayed fracture resistance of level 10.9.
Description
Technical field
The present invention relates to the micro-alloyed steel in steel industry, be specifically related to design the steel grade of high strength, high tenacity steel for fastener.
Background technology
Fastening piece is used as to be fastenedly connected, and application class mechanical component extremely widely, being widely used in above various machinery, equipment, vehicle, railway etc., is one of key component in a lot of nucleus equipment.In recent years, along with the high speed of China's track traffic industry is flourish, increasing to the demand of high-performance fastening piece.But by the impact of domestic high-strength fastening piece obdurability mismatch problem, the high-strength fastening piece of a large amount of track traffic Mobile Equipments still needs import.
Be conventionally used to the domestic 42CrMo steel manufacturing fastening piece, because its chemical composition compatibility is unreasonable, cause its mechanical property not meet the demands.Prior art, in order to improve the deficiency of material mechanical performance, adopts the treatment process improving material to improve its mechanical property and surface property.
As China Patent No. ZL200710013633.6, authorized announcement date is on December 24th, 2008, and invention and created name is: a kind of heat treating method improving 42CrMo mechanical property, and this application case adopts following steps: the first step, normalizing: 840 ~ 860 DEG C >=5h, air cooling of coming out of the stove is to room temperature; Second step, tempering: 600 ~ 620 DEG C >=6h, air cooling of coming out of the stove is to room temperature; 3rd step, modified: 840 ~ 860 DEG C >=5h, oil cooling is air cooling after 60 ~ 70 minutes, and quenching oil adds the recombiner of 8%, and tempering time about Part temperature air cooling to 200 DEG C, tempering temperature 460 ~ 480 DEG C >=6h, air cooling of coming out of the stove is to room temperature.This application case can improve the mechanical property of 42CrMo steel to a certain extent, but due to the restriction of the chemical composition of 42CrMo steel own, its mechanical property particularly plasticity and toughness there is no the requirement that method reaches high-intensity fasteners.
China Patent No. ZL201210468094.6, authorized announcement date is on February 18th, 2015, invention and created name is: a kind of high-intensity fasteners and treatment process thereof, this application case reduces sulphur (S) on the basis of common 42CrMo steel, phosphorus (P), silicon (Si), the content of manganese (Mn), and add the content of Mo, and this application case is except adjusting the composition of 42CrMo steel, also disclose a kind of new steel treatment process, comprise the following steps: (1) thermal treatment: by first for rough machined for machinery fastening piece work in-process normalizing treatment, temperature is 870-910 DEG C, soaking time is 10-20 hour, come out of the stove air cooling to room temperature, then temper, temperature is 680-700 DEG C, and soaking time is 10-20 hour, come out of the stove air cooling to room temperature, modifier treatment again: carry out quench treatment with quenching oil under 920-960 DEG C of condition, oil cooling 80-120 minute air cooling, tempering when being chilled to about 200 DEG C, tempering temperature 600-650 DEG C, soaking time 6-15 hour, come out of the stove air cooling to room temperature, (2) blackening process: be room temperature blackening process 10-20 minute under the condition of 1.5-3.5 in pH value after oil removing, acid pickling and rust removing by above-mentioned fastening piece crude product after Overheating Treatment, through cleaning after room temperature blackening process, get product after then making dehydration sealing treatment immediately.This application case after having carried out the composition of 42CrMo steel adjusting, then is heat-treated, and intensity and toughness are all greatly improved, but its heat treatment process will expend more than 35 hours, produces bring significant limitation for through engineering approaches.
Summary of the invention
1. invent the technical problem that will solve
The present invention, in order to overcome the deficiency that in prior art, steel for fastener mechanical property can not meet the demands, provides a kind of high-strength steel for fastener containing ambrose alloy and heat treating method thereof; High-strength steel for fastener provided by the invention has stable impact property and higher intensity, can be used to making 10.9 grades of delayed fracture resistance high-intensity fasteners.
2. technical scheme
For achieving the above object, technical scheme provided by the invention is:
A kind of high-strength steel for fastener containing ambrose alloy of the present invention, comprises the component of following mass percent: C:0.38 ~ 0.45%; Si:0.17 ~ 0.30%; Mn:0.60 ~ 0.80%; P≤0.010%; S≤0.010%; Cr:0.90 ~ 1.20%; Mo:0.15 ~ 0.22%; Ni:0.05 ~ 0.15%; Cu:0.10 ~ 0.20%; Surplus is Fe and inevitable impurity.
Further, Ni and Cu content ratio is 1:1 ~ 3.
Further, described high-strength steel for fastener comprises the component of following mass percent: C:0.42%; Si:0.21%; Mn:0.74%; P:0.008%; S:0.004%; Cr:0.95%; Mo:0.213%; Ni:0.100%; Cu:0.200%; Surplus is Fe and inevitable impurity, Ni and Cu content ratio is 1:2.
The heat treating method of a kind of high-strength steel for fastener containing ambrose alloy of the present invention, by described high-strength steel for fastener at 920 DEG C ~ 930 DEG C temperature, carries out quench treatment with quenching oil; Oil cooling is extremely lower than tempering when 200 DEG C, and tempering temperature is 550 DEG C ~ 580 DEG C, and soaking time is 2.5 ~ 3.5h, and air cooling of coming out of the stove is to room temperature.
Further, by described high-strength steel for fastener at 930 DEG C of temperature, quench treatment is carried out with quenching oil; Oil cooling is to tempering during room temperature, and tempering temperature is 570 DEG C, and soaking time is 3h, and air cooling of coming out of the stove is to room temperature.
3. beneficial effect
Adopt technical scheme provided by the invention, compared with existing known technology, there is following unusual effect:
(1) a kind of high-strength steel for fastener containing ambrose alloy of the present invention, each element proportioning in traditional steel is adjusted and optimized, control the content of sulphur (S), phosphorus (P), and the appropriate content increasing trace alloying element nickel (Ni) and copper (Cu), in adjustment steel, the ratio of nickel (Ni) and copper (Cu) is 1:1 ~ 3, solve the problem that copper content improves the toughness decline brought, fundamentally solve the problem using the obdurability of domestic 42CrMo steel making fastening piece can not mate very well with service requirements;
(2) heat treating method of a kind of high-strength steel for fastener containing ambrose alloy of the present invention, simple 920 DEG C ~ 930 DEG C oil quenchings+550 DEG C ~ 580 DEG C high tempering thermal treatment process are carried out to high-strength steel for fastener, tempered sorbite tissue can be obtained, and there is obvious Carbide Precipitation, steel is made to have good intensity and toughness, whole heat treatment process only needs 7 hours, has saved a large amount of time costs, is convenient to promote in the industry.
Accompanying drawing explanation
Fig. 1 ~ Fig. 4 is the high-strength steel for fastener microstructure observation figure containing ambrose alloy that in the present invention, example 1 ~ 4 obtains.
Embodiment
For understanding content of the present invention further, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.
A kind of high-strength steel for fastener containing ambrose alloy of the present invention, is made up of the chemical composition of following mass percent: C:0.38 ~ 0.45%; Si:0.17 ~ 0.30%; Mn:0.60 ~ 0.80%; P≤0.010%; S≤0.010%; Cr:0.90 ~ 1.20%; Mo:0.15 ~ 0.22%; Ni:0.05 ~ 0.15%; Cu:0.10 ~ 0.20%, Ni and Cu content ratio is 1:1 ~ 3; Surplus is Fe and inevitable impurity.
Steel grades feature of the present invention is the content controlling sulphur (S), phosphorus (P), and the appropriate content increasing trace alloying element nickel (Ni) and copper (Cu).Nickel can make ferrite strengthening make perlite increase and refinement in steel simultaneously, so can under the prerequisite of plasticity not affecting steel, make the intensity of steel improve.Take nickel as non-carbide forming element, also suitably can reduce the mass percentage content of C.In addition, nickel and iron can form α and γ sosoloid, can increase the region of γ phase region simultaneously, still make one of austenitic formation and stable element; Nickel makes the time temperature transformation curve of steel shift to lower right, and the present embodiment, by increasing the mass percentage content of Ni, makes the time lengthening of steel incubation period, reduce the speed of phase transformation, thus critical quenching rate is reduced, refinement changes tissue, and toughness and plasticity can be made to make moderate progress.
Copper makes the intensity of steel improve mainly through the mode of solution strengthening and precipitation strength in steel, the element that copper still makes the region of austenite phase expand.In steel, add mass percent higher than the Cu of 1.0%, utilize tiny ε-Cu precipitated phase to produce precipitation strength, the high strength of steel can be ensured.The present invention suitably increases copper content in steel, improves the intensity of steel, and the ratio simultaneously adjusting nickel (Ni) and copper (Cu) in steel is 1:1 ~ 3, solves the problem that copper content improves the toughness decline brought.Reduce the deformability that sulphur content can improve steel; Reducing phosphorus content can make the resistance to deformation of steel reduce.Therefore, reduction phosphorus, sulphur content not only can improve plasticity and toughness and the resistance for delayed fracture of steel, can also improve the processing characteristics of steel.
Another object of the present invention is the heat treating method providing a kind of high-strength steel for fastener containing ambrose alloy, by described high-strength steel for fastener at 920 DEG C ~ 930 DEG C temperature, carries out quench treatment with quenching oil; Oil cooling is extremely lower than tempering when 200 DEG C, and tempering temperature is 550 DEG C ~ 580 DEG C, and soaking time is 2.5 ~ 3.5h, and air cooling of coming out of the stove is to room temperature.Temperature carries out oil quenching process to steel quenching oil 920 DEG C ~ 930 DEG C time, martensite can be obtained easily, and after martensitic steel carries out high tempering again at 550 DEG C ~ 580 DEG C, martensite decomposes, Carbide Precipitation, form tempered sorbite after granular Carbide Precipitation and iron matrix ferritic compound, the high but problem that toughness is low of the intensity solving lath martensite tissue, makes steel have good intensity and toughness.
The present invention carries out brief heat treating technique to high-strength steel for fastener, tempered sorbite tissue can be obtained, it still maintains martensite lath form, and there is obvious Carbide Precipitation, martensitic steel obtains tempered sorbite tissue after quenching and high tempering, and make steel have good intensity and toughness, whole heat treatment process only needs 7 hours, save a large amount of time costs, be convenient to promote in the industry.
The present invention has stable impact property and higher intensity, is applicable to 10.9 grade high-strength fasteners making more than tensile strength 1000MPa.The tissue obtained after oil quenching and high tempering is tempered sorbite tissue, described steel tensile strength Rm=1100 ~ 1135MPa, yield strength Rel=980 ~ 1015MPa, elongation A=14.5 ~ 17.2%, 25 DEG C, v-notch ballistic work AKv=70 ~ 90J ,-20 DEG C, v-notch ballistic work AKv=55 ~ 85J.
Embodiment 1
A kind of high-strength steel for fastener containing ambrose alloy of the present embodiment, the chemical composition of selection and the percent mass proportioning of each component are see table 1:
High-strength steel for fastener chemical composition percent mass proportioning table in table 1 embodiment 1 ~ 4
Steel are processed into the pole of Φ 25mm by the present embodiment through common mechanical workout, then heat-treat.Heat treated process is: by pole at the temperature of 920 DEG C, carry out quench treatment with quenching oil, and the treatment time is 35min; Tempering during oil cooling to 200 DEG C, tempering temperature is 550 DEG C, soaking time 3.5h, and air cooling of coming out of the stove is to room temperature.
Detect tensile strength Rm, the yield strength Rel of high-intensity fasteners steel prepared by the present embodiment, elongation ψ and toughness (Impact energy Ak v), detected result is as shown in table 2:
The performance test results table of high-strength fastening piece prepared by table 2 embodiment 1 ~ 4
Microstructure observation has been carried out, referring to Fig. 1 to high-intensity fasteners steel prepared by the present embodiment.The displaing micro tissue topography of experimental steel as can be seen from Fig. 1, the microtexture after thermal treatment is tempered sorbite, and it still maintains martensite lath form, and has obvious Carbide Precipitation.Experimental steel is through oil quenching and high tempering, and the microstructure obtained is tempered sorbite tissue, and it makes steel have good intensity and toughness.In example 1 steel, the content of nickel (Ni) and copper (Cu) is respectively 0.044%, 0.100%, and the former lath martensite size in steel is larger.Also can find out that this example 1 obdurability is better from the detected result of table 2.
Embodiment 2
A kind of high-strength steel for fastener containing ambrose alloy of the present embodiment, the chemical composition of selection and the percent mass proportioning of each component are see table 1.
The present embodiment to the process that high-strength steel for fastener is heat-treated is: by pole at the temperature of 925 DEG C, carry out quench treatment with quenching oil, and the treatment time is 37min; Tempering during oil cooling to 150 DEG C, tempering temperature is 560 DEG C, soaking time 3h, and air cooling of coming out of the stove is to room temperature.
Detect tensile strength Rm, the yield strength Rel of high-intensity fasteners steel prepared by the present embodiment, elongation ψ and toughness (Impact energy Ak v), detected result is as shown in table 2.
Microstructure observation has been carried out, referring to Fig. 2 to high-intensity fasteners steel prepared by the present embodiment.The displaing micro tissue topography of experimental steel as can be seen from Fig. 2, the microtexture after thermal treatment is tempered sorbite, and it still maintains martensite lath form, and has obvious Carbide Precipitation.Experimental steel is through oil quenching and high tempering, and the microstructure obtained is tempered sorbite tissue, and it makes steel have good intensity and toughness.In example 2 steel, the content of nickel (Ni) and copper (Cu) is respectively 0.076%, 0.160%, and the former lath martensite size in steel is less.Also can find out that this example 2 obdurability is better from the detected result of table 2.
Embodiment 3
A kind of high-strength steel for fastener containing ambrose alloy of the present embodiment, the chemical composition of selection and the percent mass proportioning of each component are see table 1.
The present embodiment to the process that high-strength steel for fastener is heat-treated is: by pole at the temperature of 930 DEG C, carry out quench treatment with quenching oil, and the treatment time is 40min; Oil cooling is to tempering during room temperature, and tempering temperature is 570 DEG C, soaking time 3h, and air cooling of coming out of the stove is to room temperature.
Detect tensile strength Rm, the yield strength Rel of high-intensity fasteners steel prepared by the present embodiment, elongation ψ and toughness (Impact energy Ak v), detected result is as shown in table 2.
Microstructure observation has been carried out, referring to Fig. 3 to high-intensity fasteners steel prepared by the present embodiment.The displaing micro tissue topography of experimental steel as can be seen from Fig. 3, the microtexture after thermal treatment is tempered sorbite, and it still maintains martensite lath form, and has obvious Carbide Precipitation.Experimental steel is through oil quenching and high tempering, and the microstructure obtained is tempered sorbite tissue, and it makes steel have good intensity and toughness.In example 3 steel, the content of nickel (Ni) and copper (Cu) is respectively 0.100%, 0.200%, and the former lath martensite size in steel is less.Also can find out that this example 3 obdurability is best from the detected result of table 2.
Embodiment 4
A kind of high-strength steel for fastener containing ambrose alloy of the present embodiment, the chemical composition of selection and the percent mass proportioning of each component are see table 1.
The present embodiment to the process that high-strength steel for fastener is heat-treated is: by pole at the temperature of 927 DEG C, carry out quench treatment with quenching oil, and the treatment time is 45min; Tempering during oil cooling to 200 DEG C, tempering temperature is 580 DEG C, soaking time 3.5h, and air cooling of coming out of the stove is to room temperature.
Detect tensile strength Rm, the yield strength Rel of high-intensity fasteners steel prepared by the present embodiment, elongation ψ and toughness (Impact energy Ak v), detected result is as shown in table 2.
Microstructure observation has been carried out, referring to Fig. 4 to high-intensity fasteners steel prepared by the present embodiment.The displaing micro tissue topography of experimental steel as can be seen from Fig. 4, the microtexture after thermal treatment is tempered sorbite, and it still maintains martensite lath form, and has obvious Carbide Precipitation.Experimental steel is through oil quenching and high tempering, and the microstructure obtained is tempered sorbite tissue, and it makes steel have good intensity and toughness.In example 4 steel, the content of nickel (Ni) and copper (Cu) is respectively 0.092%, 0.170%, and the former lath martensite size in steel is less.Also can find out that this example semi-finals toughness is better from the detected result of table 2.
Finally should be noted that; above embodiment is only for illustration of technical scheme of the present invention but not limiting the scope of the invention; although be explained in detail the present invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to technical scheme of the present invention or equivalent replacement, and not depart from essence and the scope of technical solution of the present invention.
Claims (5)
1., containing a high-strength steel for fastener for ambrose alloy, it is characterized in that: the component comprising following mass percent: C:0.38 ~ 0.45%; Si:0.17 ~ 0.30%; Mn:0.60 ~ 0.80%; P≤0.010%; S≤0.010%; Cr:0.90 ~ 1.20%; Mo:0.15 ~ 0.22%; Ni:0.05 ~ 0.15%; Cu:0.10 ~ 0.20%; Surplus is Fe and inevitable impurity.
2. a kind of high-strength steel for fastener containing ambrose alloy according to claim 1, is characterized in that: Ni and Cu content ratio is 1:1 ~ 3.
3. a kind of high-strength steel for fastener containing ambrose alloy according to claim 2, is characterized in that: the component comprising following mass percent: C:0.42%; Si:0.21%; Mn:0.74%; P:0.008%; S:0.004%; Cr:0.95%; Mo:0.213%; Ni:0.100%; Cu:0.200%; Surplus is Fe and inevitable impurity.
4. the method for heat-treating containing the high-strength steel for fastener of ambrose alloy described in pair any one of claims 1 to 3, the steps include: described high-strength steel for fastener at 920 DEG C ~ 930 DEG C temperature, carries out quench treatment with quenching oil; Oil cooling is extremely lower than tempering when 200 DEG C, and tempering temperature is 550 DEG C ~ 580 DEG C, and soaking time is 2.5 ~ 3.5h, and air cooling of coming out of the stove is to room temperature.
5. the heat treating method of a kind of high-strength steel for fastener containing ambrose alloy according to claim 4, is characterized in that: by described high-strength steel for fastener at 930 DEG C of temperature, carry out quench treatment with quenching oil; Oil cooling is to tempering during room temperature, and tempering temperature is 570 DEG C, and soaking time is 3h, and air cooling of coming out of the stove is to room temperature.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107312970A (en) * | 2017-06-24 | 2017-11-03 | 武汉钢铁有限公司 | A kind of high-strength steel for fastener of super large and production method |
| CN109957707A (en) * | 2017-12-14 | 2019-07-02 | 鞍钢股份有限公司 | A kind of 1000MPa grades of fastener weather-proof the cold heading steel and its production method |
| CN112359264A (en) * | 2020-10-15 | 2021-02-12 | 中天钢铁集团有限公司 | Production method of high-strength and high-toughness steel for wind power bolts |
| CN115216696A (en) * | 2022-07-22 | 2022-10-21 | 上海大学 | Ultrahigh-strength alloy steel, 20.8-grade threaded fastener and preparation method thereof |
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| CN101220439A (en) * | 2007-01-08 | 2008-07-16 | 宝山钢铁股份有限公司 | Non-quenching and tempering double-phase cold heading steel for high-strength fastener and method for manufacturing same |
| CN103161854A (en) * | 2011-12-08 | 2013-06-19 | 现代自动车株式会社 | Brake disk |
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| CN101220439A (en) * | 2007-01-08 | 2008-07-16 | 宝山钢铁股份有限公司 | Non-quenching and tempering double-phase cold heading steel for high-strength fastener and method for manufacturing same |
| CN101186963A (en) * | 2007-12-17 | 2008-05-28 | 国网北京电力建设研究院 | Heat treatment technique of high strength anchor bolt for extra-high voltage transmission line rod tower |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107312970A (en) * | 2017-06-24 | 2017-11-03 | 武汉钢铁有限公司 | A kind of high-strength steel for fastener of super large and production method |
| CN107312970B (en) * | 2017-06-24 | 2019-07-16 | 武汉钢铁有限公司 | A kind of high-strength steel for fastener of super large and production method |
| CN109957707A (en) * | 2017-12-14 | 2019-07-02 | 鞍钢股份有限公司 | A kind of 1000MPa grades of fastener weather-proof the cold heading steel and its production method |
| CN112359264A (en) * | 2020-10-15 | 2021-02-12 | 中天钢铁集团有限公司 | Production method of high-strength and high-toughness steel for wind power bolts |
| CN115216696A (en) * | 2022-07-22 | 2022-10-21 | 上海大学 | Ultrahigh-strength alloy steel, 20.8-grade threaded fastener and preparation method thereof |
| CN115216696B (en) * | 2022-07-22 | 2023-08-08 | 上海大学 | Ultra-high strength alloy steel, 20.8-grade threaded fastener and preparation method thereof |
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