CN103290327A - High-temperature-resistant high-performance alloyed fastener and manufacturing technique thereof - Google Patents
High-temperature-resistant high-performance alloyed fastener and manufacturing technique thereof Download PDFInfo
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- CN103290327A CN103290327A CN2013102530652A CN201310253065A CN103290327A CN 103290327 A CN103290327 A CN 103290327A CN 2013102530652 A CN2013102530652 A CN 2013102530652A CN 201310253065 A CN201310253065 A CN 201310253065A CN 103290327 A CN103290327 A CN 103290327A
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Abstract
The invention provides a high-temperature-resistant high-performance alloyed fastener comprising following ingredients: 0.42% of C, 0.33% of Si, 0.70% of Mn, 0.030% or less of S, 0.030% or less of P, 1.10% of Cr, 0.025% or less of Ni, 0.025% or less of Cu, 0.20% of Mo, 0.24% of V, and 0.03% of Nb. The invention also provides a manufacturing technique used for production of the alloyed fastener. The manufacturing technique of the high-temperature-resistant high-performance alloyed fastener helps to solve a problem that: manufacturing techniques used for production of alloyed fasteners with a level of 12.9 or above have not been invented in domestic at present. The alloyed fastener produced by the manufacturing technique possesses high strength and hardness which are not possessed by common fasteners, and excellent plasticity, toughness, corrosion resistance, tensile strength, fatigue strength and delayed fracture resistance. The alloyed fastener is capable of ensuring that failures such as break and damage are not easy to happen in manufacturing process and using procedures, and can function normally at a highest temperature of 500 DEG C. Service life of the fastener is extremely prolonged.
Description
Technical field
The invention belongs to metal machining field, relate to a kind of fire-resistant high-performance alloy fastening piece and production technique thereof.
Background technology
Continuous propelling along with China's development equipment manufacture process, industrial upgrading speed is constantly accelerated, the fusion of China's Investment in fastener industry and countries in the world economy is constantly accelerated, and this quality product to China's Investment in fastener industry, state of the art have proposed more and more higher requirement.
China's calendar year 2001 accession to WTO is also stepped into the ranks of international trade big country, and fastener products exports to countries in the world in a large number, and the fastener products of countries in the world also constantly pours in Chinese market.Fastening piece is as one of bigger product of China's import and export amount, realizes in line with international standardsly, goes to the world to promoting Chinese fastening piece enterprise, promotes fastening piece enterprise to participate in international cooperation comprehensively and competes, and all tool is with important demonstration meaning and strategic importance.
The high strength bolt that automotive industry is used at present comprises 8.8 grades, 9.8 grades, 10.9 grades and 12.9 grades of four intensity ranks, be generally medium carbon steel or the medium carbon alloy steel of modifier treatment, non-hardened and tempered steel, boron steel, F-M dual phase steel or low-carbon martensitic steels are also arranged, to the automobile of high intensity levels more with the research of fastening piece and use and then just begin in recent years to occur.
It is external that the bolting steel of domestic production at present will lag behind state, similarly is can reach 12.9 grades bolting steel different materials such as ML20MnVB, ML35CrMoV, 35CrMo are only arranged.China's fastening piece is manufactured on aspects such as metallic substance, thermal treatment, protecting metallic surface, assembly method and has accumulated certain experience, but technological innovation is few, and going together with the state external fastening element, to compare gap bigger for state of the art.Along with the development in fields such as automotive industry, high-speed railway, heavy construction, aerospace, to the demands for higher performance of fastening piece.Following fastening piece will be to high strength, high-performance, energy-conserving and environment-protective and professional development, to adapt to the demand of different application field development.
Summary of the invention
The objective of the invention is to, a kind of fire-resistant high-performance alloy fastening piece and production technique thereof are provided, domestic backward in the fastener areas production technique to solve, fastener strength can't reach the problem more than 12.9 grades.
For addressing the above problem, the invention provides a kind of fire-resistant high-performance alloy fastening piece, comprise following chemical ingredients:
Carbon C:0.42%; Silicon Si:0.33%; Manganese Mn:0.70%; Sulphur S≤0.030%; Phosphorus P≤0.030%; Chromium Cr:1.10%; Nickel≤0.025%; Copper Cu≤0.025%; Molybdenum Mo:0.20%; Vanadium V:0.24%; Niobium Nb:0.03%.
Above-mentioned alloy fastening piece can be under 500 ℃ temperature environment steady operation.
The present invention also provides the production technique of above-mentioned alloy fastening piece, and step is as follows:
S1: selected material is carried out cold-heading handle;
S2: the work in-process after the cold-heading are heat-treated;
S3: the work in-process after the thermal treatment are carried out roll extrusion.
Further, the starting material of described production technique employing are 42CrMoVNb.
Further, described starting material 42CrMoVNb comprises following chemical ingredients:
Carbon C:0.38%～0.45%; Silicon Si:0.17%～0.37%; Manganese Mn:0.50%～0.80; Sulphur S: allow residual content≤0.035%; Phosphorus P: allow residual content≤0.035%; Chromium Cr:0.90%～1.20%; Nickel: allow residual content≤0.030%; Copper Cu: allow residual content≤0.030%; Molybdenum Mo:0.15%～0.25%; Vanadium V:0.15%～0.40%; Niobium Nb:0.02%～0.10%.
Further, N2-CH3OH nitrogen-based atmosphere thermal treatment process is adopted in the thermal treatment among the described production craft step S2.
Further, described thermal treatment process comprises quenching and two stages of tempering.
Further, the temperature in described quenching stage is 940 ℃, and the temperature in described tempering stage is 610 ℃.
The starting material that adopt among the present invention are 42CrMoVNb.In the screening of raw materials process, chemical ingredients by all kinds of alloy materials of comparative analysis, be prerequisite not reduce even to improve tempering temperature, select high strength bolting steel 42CrMo steel and be the basis, by improving molybdenum content and adding microalloy element vanadium, niobium, and reduce the content of S, P, Si, Mn, select for use 42CrMoVNb as high strength bolt raw material steel grade more than 12.9 grades, to improve combination of strength and toughness, resistance for delayed fracture and the cold-forming property of high strength bolt.
Step S1 carries out cold-heading to selected material 42CrMoVNb to handle, and because 42CrMoVNb is medium carbon steel and contains Cr, Mo alloying element, thereby the workhardness rate is higher, need take certain technological measure when the cold-heading head.Step S1 adopts bolt shank to tighten the cold-forge forming technology, reduces the deflection that bolt head is shaped relatively, the mis-behave of avoiding the direct cold-heading of bolt head of aximal deformation value to bring.
Step S2 is that the work in-process after cold-heading is handled are heat-treated, and adopts N
2-CH
3The OH nitrogen-based atmosphere, control N
2With the ratio of dissociated methanol gas be 40/60 type, adopt 940 ℃ of quenchings, the thermal treatment process of 610 ℃ of tempering, control bolt surface decarburization phenomenon effectively, improve the fatigue property of high strength bolt more than 12.9 grades, simultaneously, in the process of work in-process through 610 ℃ of tempering, its microstructure can be converted into by austenite and organize stable sorbite, and its microstructure can not change when working under being up to 500 ℃ hot environment, can keep its mechanical property.
Step S3 carries out roll extrusion to the work in-process after the thermal treatment, by cylindrical die roll thread profile control screw thread bottom of trench arc radius, rolling technology after the exploitation thermal treatment, introduce favourable residual compressive stress, offset the stress concentration that thread gap produces when stretching, reduce effective tensile stress, improve fatigue property and the resistance for delayed fracture of high strength bolt.
The invention has the beneficial effects as follows, a kind of production technique of fire-resistant high-performance alloy fastening piece is provided, solve the domestic problem of not having alloy fastening piece production technique more than 12.9 grades at present temporarily.The alloy fastening piece that comes out by this explained hereafter, not only have intensity and hardness that General fasteners does not possess, possess good plasticity, toughness, erosion resistance and outstanding tensile strength, fatigue strength and delayed fracture drag simultaneously, except can guarantee that it is not prone to the Problem of Failure such as fracture, destruction in the manufacturing of association area and use, can also keep works better being up under 500 ℃ the hot environment, greatly the raising of degree work-ing life.
Embodiment
Be starting material with 42CrMoVNb, the described cold-heading of step S1 is handled and is adopted bolt shank to tighten the cold-forge forming technology, reduces the deflection that bolt head is shaped relatively, the mis-behave of avoiding the direct cold-heading of bolt head of aximal deformation value to bring;
The described heat treatment technics of step S2 adopts N
2-CH
3The OH nitrogen-based atmosphere, control N
2With the ratio of dissociated methanol gas be 40/60 type, in two stages in thermal treatment, the temperature in the stage of quenching is 940 ℃, the temperature in tempering stage is 610 ℃;
The described roll extrusion technology of step S3 is by cylindrical die roll thread profile control screw thread bottom of trench arc radius, rolling technology after the exploitation thermal treatment, introduce favourable residual compressive stress, offset the stress concentration that thread gap produces when stretching, reduce effective tensile stress, improve fatigue property and the resistance for delayed fracture of high strength bolt.
The technical indicator of the fastening piece of producing by above-mentioned production technique among the present invention is as follows:
(1) minimum tensile strength: σ b min 〉=1440 N/mm2;
(2) yield strength: σ s 〉=1370 MPa;
(3) hardness (HRC): 44-50;
(4) elongation after fracture: δ 〉=12%;
(5) relative reduction in area: ψ 〉=49%
(6) heat resisting temperature :≤500 ℃.
Claims (8)
1. fire-resistant high-performance alloy fastening piece, it is characterized in that: described fastening piece comprises following chemical ingredients:
Carbon C:0.42%; Silicon Si:0.33%; Manganese Mn:0.70%; Sulphur S≤0.030%; Phosphorus P≤0.030%; Chromium Cr:1.10%; Nickel≤0.025%; Copper Cu≤0.025%; Molybdenum Mo:0.20%; Vanadium V:0.24%; Niobium Nb:0.03%.
2. alloy fastening piece according to claim 1 is characterized in that: described alloy fastening piece can be under 500 ℃ temperature environment steady operation.
3. the production technique of claim 1 an interalloy fastening piece, it is characterized in that: described production craft step is as follows:
S1: starting material are carried out cold-heading handle;
S2: the work in-process after the cold-heading are heat-treated;
S3: the work in-process after the thermal treatment are carried out roll extrusion.
4. production technique according to claim 3 is characterized in that: the starting material that described production technique adopts are 42CrMoVNb.
5. production technique according to claim 4, it is characterized in that: described starting material 42CrMoVNb comprises following chemical ingredients:
Carbon C:0.38%～0.45%; Silicon Si:0.17%～0.37%; Manganese Mn:0.50%～0.80%; Sulphur S: allow residual content≤0.035%; Phosphorus P: allow residual content≤0.035%; Chromium Cr:0.90%～1.20%; Nickel: allow residual content≤0.030%; Copper Cu: allow residual content≤0.030%; Molybdenum Mo:0.15～0.25%; Vanadium V:0.15≤V≤0.40%; Niobium Nb:0.02≤Nb≤0.10%.
6. production technique according to claim 3 is characterized in that: the thermal treatment employing N2-CH3OH nitrogen-based atmosphere thermal treatment process among the described production craft step S2.
7. production technique according to claim 6 is characterized in that: described thermal treatment process comprises quenches and two stages of tempering.
8. production technique according to claim 7, it is characterized in that: the temperature in described quenching stage is 940 ℃, the temperature in described tempering stage is 610 ℃.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104046903A (en) * | 2014-06-30 | 2014-09-17 | 宝山钢铁股份有限公司 | Coil rod for Grade 13.9/Grade 14.9 delayed-fracture-resistant high-strength fasteners and manufacturing method thereof |
| CN105543684A (en) * | 2015-12-23 | 2016-05-04 | 宝鼎科技股份有限公司 | Horizontal rotating base forging of adjustable propeller blade and manufacturing process of horizontal rotating base forging |
| CN105714034A (en) * | 2015-03-19 | 2016-06-29 | 范玫光 | Prestressed anchor bolt used for wind power foundation and induction heating heat treatment method thereof |
| CN107119226A (en) * | 2017-05-11 | 2017-09-01 | 河北金奥管业有限公司 | A kind of hollow stabilizer rod of automobile is with high fatigue durability tube material |
| CN108103396A (en) * | 2017-11-30 | 2018-06-01 | 湖南铂固标准件制造有限公司 | It is a kind of for manganese molybdenum-vanadium steel iron material of high-strength bolt and preparation method thereof |
| CN109465607A (en) * | 2018-12-26 | 2019-03-15 | 温州市鸿图汽车零部件有限公司 | A kind of processing technology of high-strength bolt |
| CN111655883A (en) * | 2018-01-30 | 2020-09-11 | 日产自动车株式会社 | Bolt |
| CN112522492A (en) * | 2020-10-28 | 2021-03-19 | 浙江自紧王机械有限公司 | Self-tightening nut and heat treatment process of self-tightening gasket |
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| CN1443946A (en) * | 2003-04-17 | 2003-09-24 | 南京汽车集团有限公司 | Production process of high strength bolt with above 1300MPa |
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| CN1443946A (en) * | 2003-04-17 | 2003-09-24 | 南京汽车集团有限公司 | Production process of high strength bolt with above 1300MPa |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104046903A (en) * | 2014-06-30 | 2014-09-17 | 宝山钢铁股份有限公司 | Coil rod for Grade 13.9/Grade 14.9 delayed-fracture-resistant high-strength fasteners and manufacturing method thereof |
| CN104046903B (en) * | 2014-06-30 | 2017-01-11 | 宝山钢铁股份有限公司 | Coil rod for Grade 13.9/Grade 14.9 delayed-fracture-resistant high-strength fasteners and manufacturing method thereof |
| CN105714034A (en) * | 2015-03-19 | 2016-06-29 | 范玫光 | Prestressed anchor bolt used for wind power foundation and induction heating heat treatment method thereof |
| CN105543684A (en) * | 2015-12-23 | 2016-05-04 | 宝鼎科技股份有限公司 | Horizontal rotating base forging of adjustable propeller blade and manufacturing process of horizontal rotating base forging |
| CN105543684B (en) * | 2015-12-23 | 2017-12-29 | 宝鼎科技股份有限公司 | Adjustable propeller blade left-right rotary base forging and manufacturing process |
| CN107119226A (en) * | 2017-05-11 | 2017-09-01 | 河北金奥管业有限公司 | A kind of hollow stabilizer rod of automobile is with high fatigue durability tube material |
| CN107119226B (en) * | 2017-05-11 | 2018-07-06 | 河北金奥管业有限公司 | A kind of high fatigue durability tube material of hollow stabilizer rod of automobile |
| CN108103396A (en) * | 2017-11-30 | 2018-06-01 | 湖南铂固标准件制造有限公司 | It is a kind of for manganese molybdenum-vanadium steel iron material of high-strength bolt and preparation method thereof |
| CN111655883A (en) * | 2018-01-30 | 2020-09-11 | 日产自动车株式会社 | Bolt |
| US11333189B2 (en) | 2018-01-30 | 2022-05-17 | Nissan Motor Co., Ltd. | Bolt |
| CN109465607A (en) * | 2018-12-26 | 2019-03-15 | 温州市鸿图汽车零部件有限公司 | A kind of processing technology of high-strength bolt |
| CN112522492A (en) * | 2020-10-28 | 2021-03-19 | 浙江自紧王机械有限公司 | Self-tightening nut and heat treatment process of self-tightening gasket |
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Application publication date: 20130911 |