CN103339276B - Aluminum alloy wire for use in bolts, bolt, and manufacturing method of these. - Google Patents

Aluminum alloy wire for use in bolts, bolt, and manufacturing method of these. Download PDF

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Publication number
CN103339276B
CN103339276B CN201280007038.0A CN201280007038A CN103339276B CN 103339276 B CN103339276 B CN 103339276B CN 201280007038 A CN201280007038 A CN 201280007038A CN 103339276 B CN103339276 B CN 103339276B
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China
Prior art keywords
quality
bolt
aluminum alloy
content
alloy line
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CN201280007038.0A
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Chinese (zh)
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CN103339276A (en
Inventor
高木义幸
西川太一郎
高井博昭
赤祖父保广
北村真一
Original Assignee
住友电气工业株式会社
富山住友电工株式会社
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Priority to JP2011-250528 priority Critical
Priority to JP2011250528A priority patent/JP5335056B2/en
Application filed by 住友电气工业株式会社, 富山住友电工株式会社 filed Critical 住友电气工业株式会社
Priority to PCT/JP2012/079512 priority patent/WO2013073575A1/en
Publication of CN103339276A publication Critical patent/CN103339276A/en
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Publication of CN103339276B publication Critical patent/CN103339276B/en

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Classifications

    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/05Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/003Drawing materials of special alloys so far as the composition of the alloy requires or permits special drawing methods or sequences
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/02Alloys based on aluminium with silicon as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/06Alloys based on aluminium with magnesium as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/06Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08Alloys based on aluminium with magnesium as the next major constituent with silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS, WEDGES, JOINTS OR JOINTING
    • F16B33/00Features common to bolt and nut
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B3/00Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B2003/001Aluminium or its alloys

Abstract

This aluminum alloy wire for use in bolts contains, in mass %, Si:0.60-1.5%, Fe:0.02-0.40%, Cu:0.50-1.2%, Mn:0.50-1.1%, Mg:0.70-1.3%, Cr:0.01-0.30%, Zn:0.005-0.50%, Ti:0.01-0.20% and Zr:0.05-0.20%, the remainder being Al and unavoidable impurities. A part of the Si and Mg content is in the form of Mg2Si, and Mg2Si/(Mn+Cr), the ratio of the content of Mg2Si to the total content of Mn and Cr, is 1.0-2.1.

Description

Bolt aluminum alloy line, bolt and manufacture method thereof

Technical field

The present invention relates to a kind of bolt aluminum alloy line, bolt and manufacture method thereof.The invention particularly relates to and a kind ofly there is excellent processing characteristics in bolt manufacture and the bolt aluminum alloy line of the bolt with sufficient intensity can be provided.

Background technology

Known A6056 is a kind of material for aluminium alloy bolt.In addition, also known patent document 1(Japanese Patent Laid-Open No.2011-1602) described in aluminum alloy line rod.Aluminum alloy line rod described in patent documentation 1 has such crystallite, and this crystallite has 6000 and is the rolling texture of composition and has predetermined average crystal grain diameter.Patent documentation 1 also describes this aluminum alloy line rod and has excellent bolt formability, and obtains predetermined tensile strength by carrying out suitable thermal treatment and processing.

Reference listing

Patent documentation

Patent documentation 1: Japanese Patent Laid-Open No.2011-1602

Summary of the invention

Technical problem

But the formability of A6056 is poor.Therefore, in casting or the operation of rolling, the defect etc. that produces can cause forming crack being processed in bolt process, or small crack can cause grain boundary corrosion.And, even if the bolt formed by A6056 can not provide enough intensity through artificial age-hardening.

On the other hand, patent documentation 1 describes the formability that can improve A6056 and can provide the aluminum alloy line rod of intensity for the bolt formed by it.But, need development to guarantee formability and the aluminum alloy line of more high strength still can be provided after forming bolt.Such bolt aluminum alloy line is developed in special expectation, and when using this bolt in high temperature environments, it is less that intensity reduces degree, and still keep high strength.

Complete the present invention in the scenario above, and the object of this invention is to provide a kind of bolt aluminum alloy line, and manufacture the method for this aluminum alloy line, when this aluminum alloy line is formed bolt, there is enough formabilities, and provide high strength for bolt.Another object of the present invention is to provide a kind of bolt formed by bolt aluminum alloy line of the present invention, and a kind of method manufacturing this bolt.

The means of dealing with problems

For improving formability based on 6000 line aluminium alloys and intensity further, the present inventor conducts in-depth research and finds, the part in comprised Si and Mg is Mg 2during the form of Si, effectively can regulate Mg 2ratio Mg between the content of Si and the total content of Mn and Cr 2si/ (Mn+Cr) falls into predetermined scope to make it, this completes the present invention.

Bolt aluminum alloy line according to the present invention contains the Si of 0.60 quality %-1.5 quality %, the Fe of 0.02 quality %-0.40 quality %, the Cu of 0.50 quality %-1.2 quality %, the Mn of 0.50 quality %-1.1 quality %, the Mg of 0.70 quality %-1.3 quality %, Cr, the Zn of 0.005 quality %-0.50 quality % of 0.01 quality %-0.30 quality %, the Zr of the Ti of 0.01 quality %-0.20 quality % and 0.05 quality %-0.20 quality %, and surplus is Al and subsidiary impurity.A part in Si and Mg comprised is Mg 2the form of Si.Mg 2ratio Mg between the content of Si and the total content of Mn and Cr 2si/ (Mn+Cr) is 1.0 to 2.1.This composition can be called the first composition.

Depend on the content of Si and Mg, the intensity of the bolt obtained is different.In aluminium alloy, by solution annealing and ageing treatment, make Si and Mg at least in part with Mg 2the form of Si is separated out, to improve the intensity of bolt.When the alloy wire with above-mentioned composition is formed bolt, it has excellent formability, and can provide the bolt with sufficient intensity after such shaping.Specifically, by correlative value Mg 2si/ (Mn+Cr) limits, and can be had the bolt of excellent thermotolerance simultaneously.It should be noted that in the cast material stage, Mg 2the ratio of Si/ (Mn+Cr) is 1.0 to 2.1, and afterwards by being rolled cast material and wire drawing and in each stage obtaining wire drawing material and form bolt by this wire drawing material, this ratio still remains in above-mentioned scope substantially.

What need proposition is, a kind of form according to bolt aluminum alloy line of the present invention contains: the Si of 0.80 quality %-1.4 quality %, the Fe of 0.05 quality %-0.30 quality %, the Cu of 0.50 quality %-1.2 quality %, the Mn of 0.50 quality %-1.1 quality %, the Mg of 0.80 quality %-1.3 quality %, the Cr of 0.05 quality %-0.30 quality %, the Zn of 0.05 quality %-0.25 quality %, the Ti of 0.01 quality %-0.10 quality %, and the Zr of 0.10 quality %-0.20 quality %.This composition can be called the second composition.

By the content by above-mentioned element, the first composition is limited, the bolt with more excellent mechanical property can be obtained.Specifically, can obtain that tensile strength is more than or equal to 400MPa, 0.2% proof stress is more than or equal to 360MPa and elongation be more than or equal to 6% bolt.

Need to propose, a kind of form with the bolt aluminum alloy line of the second composition according to the present invention comprises: the Cu of 0.80 quality %-1.2 quality %, the Mn of 0.70 quality %-1.1 quality %, and the Cr of 0.05 quality %-0.30 quality %.This composition can be called the 3rd composition.

By utilizing the content of above-mentioned element to limit further the second composition, the bolt with more excellent mechanical property can be obtained.Specifically, can obtain that tensile strength is more than or equal to 430MPa, 0.2% proof stress is more than or equal to 370MPa and elongation be more than or equal to 6% bolt.

Need to propose, according to the Sr of a kind of form further containing 0.005 quality %-0.05 quality % with the bolt aluminum alloy line of the first to the 3rd composition of the present invention.

According to this composition, by comprising the Sr of predetermined amount, can prevent from casting or the generation of defect in the operation of rolling, and the appearance in crack in forming process etc. can be reduced.

Need to propose, comprise the Sr of 0.005 quality %-0.03 quality % according to a kind of form of the bolt aluminum alloy line containing Sr of the present invention, and the ratio Zr/Sr between the content of Zr and the content of Sr is 3 to 50.

By limiting the content of Sr in the first composition, and by comprising Zr and Sr of predetermined ratio, then while the thermotolerance of vital line, enough formabilities can be guaranteed.Although Zr is required element for the thermotolerance improving aluminum alloy line, when uprising containing casting temp during Zr, this just makes to be difficult to carry out grain refining.On the other hand, when comprised Sr is predetermined ratio relative to the ratio of Zr, then the alligatoring of crystal grain can effectively be suppressed.When containing Sr, although the intensity of aluminum alloy line improves, aluminum alloy line becomes fragile possibly.When containing Sr when there is the Zr of predetermined amount, embrittlement is suppressed and can be guaranteed formability.

Manufacture the method according to bolt aluminum alloy line of the present invention, comprise the steps:

Casting step: obtain cast material, described cast material contains the Si of 0.60 quality %-1.5 quality %, the Fe of 0.02 quality %-0.40 quality %, the Cu of 0.50 quality %-1.2 quality %, the Mn of 0.50 quality %-1.1 quality %, the Mg of 0.70 quality %-1.3 quality %, the Cr of 0.01 quality %-0.30 quality %, the Zn of 0.005 quality %-0.50 quality %, the Ti of 0.01 quality %-0.20 quality %, with the Zr of 0.05 quality %-0.20 quality %, surplus is Al and subsidiary impurity, and the part in wherein comprised described Si and Mg is Mg 2the form of Si, and Mg 2ratio Mg between the content of Si and the total content of Mn and Cr 2si/ (Mn+Cr) is 1.0 to 2.1.

Milling step: above-mentioned cast material is rolled and obtains rolling stock.

Drawing step: wire drawing is carried out to the rolling material and obtain predetermined wire diameter wire drawing line rod.

Intermediate softening step: at 250 DEG C to 500 DEG C, the 0.5 little sofening treatment up to 40 hours is carried out to the line rod in above-mentioned drawing step.

According to this method, the aluminum alloy line being applicable to manufacture bolt can be obtained.Specifically, can obtain as the raw-material aluminum alloy line of the bolt with excellent productivity and mechanical property.

Bolt according to the present invention is the bolt formed by aluminium alloy.Described aluminium alloy contains the Si of 0.60 quality %-1.5 quality %, the Fe of 0.02 quality %-0.40 quality %, the Cu of 0.50 quality %-1.2 quality %, the Mn of 0.50 quality %-1.1 quality %, the Mg of 0.70 quality %-1.3 quality %, the Cr of 0.01 quality %-0.30 quality %, the Zn of 0.005 quality %-0.50 quality %, the Ti of 0.01 quality %-0.20 quality %, and the Zr of 0.05 quality %-0.20 quality %, surplus is Al and subsidiary impurity.A part in Si and Mg that this alloy comprises is Mg 2the form of Si, and Mg 2ratio Mg between the content of Si and the total content of Mn and Cr 2si/ (Mn+Cr) is 1.0 to 2.1.This bolt has the tensile strength being more than or equal to 380MPa, is more than or equal to 0.2% proof stress of 350MPa, and is more than or equal to the elongation of 6%.

By using the starting material with above-mentioned composition, the bolt that mechanical property (as tensile strength, 0.2% proof stress etc.) is excellent can be obtained.

Manufacture the method according to bolt of the present invention, comprise the steps:

Cutting step: bolt aluminum alloy line according to the present invention is cut into predetermined length.

Cold pressure makes step: carry out cutting machine processing with the head forming bolt to the bolt aluminum alloy line after cutting.

Form rolling step: rolling is formed to form the threaded portion of bolt to the bolt aluminum alloy line after cutting.

Heat treatment step: to the target object manufactured in the process of bolt carries out solution annealing and ageing treatment by bolt aluminum alloy line.

According to the method, in bolt forming process, not easily there is crack etc., and bolt can be manufactured with enough productivitys.The bolt of gained is excellent in the physical strengths such as tensile strength.In addition, according to the composition of aluminum alloy line of the present invention, the bolt also simultaneously with excellent heat resistance can be obtained.

Beneficial effect of the present invention

According to aluminum alloy line of the present invention and by the aluminum alloy line with the first composition that aluminum alloy line manufacture method of the present invention obtains, there is in bolt forming process excellent processing characteristics, and the bolt with excellent mechanical property can be provided.Therefore, bolt according to the present invention has excellent mechanical property, and aluminum alloy line manufacture method of the present invention can provide the bolt with very good mechanical properties.

Embodiment

Below will be described embodiments of the present invention.It should be noted that in the following description, the composition of aluminum alloy line represents with quality %.

[aluminum alloy line]

A kind of bolt aluminum alloy line according to the present invention contains the Si of 0.60 quality %-1.5 quality %, the Fe of 0.02 quality %-0.40 quality %, the Cu of 0.50 quality %-1.2 quality %, the Mn of 0.50 quality %-1.1 quality %, the Mg of 0.70 quality %-1.3 quality %, the Cr of 0.01 quality %-0.30 quality %, the Zn of 0.005 quality %-0.50 quality %, the Ti of 0.01 quality %-0.20 quality % and the Zr of 0.05 quality %-0.20 quality %, surplus is Al and subsidiary impurity.In bolt aluminum alloy line according to the present invention, the part in Si and Mg comprised is Mg 2the form of Si, and Mg 2ratio Mg between the content of Si and the total content of Mn and Cr 2si/ (Mn+Cr) is that 1.0 to 2.1(first forms).Therefore, it is possible to obtain the aluminum alloy line in bolt forming process with excellent processing characteristics, the bolt with excellent mechanical property thus can be provided.

Preferably, bolt aluminum alloy line according to the present invention contains the Si of 0.80 quality %-1.4 quality %, the Fe of 0.05 quality %-0.30 quality %, the Cu of 0.50 quality %-1.2 quality %, the Mn of 0.50 quality %-1.1 quality %, the Mg of 0.80 quality %-1.3 quality %, the Cr of 0.05 quality %-0.30 quality %, the Zn of 0.05 quality %-0.25 quality %, the Ti of 0.01 quality %-0.10 quality %, and the Zr(second of 0.10 quality %-0.20 quality % forms).Therefore, it is possible to provide, there is more excellent physical strength and the bolt of good heat resistance.

Preferably, in the second composition, the content of Cu is the content of 0.80 quality %-1.2 quality %, Mn is 0.70 quality %-1.1 quality %, and the content of Cr is 0.05 quality %-0.30 quality %(the 3rd composition).Therefore, it is possible to provide, there is more excellent physical strength and the bolt of good heat resistance.

Preferably, bolt aluminum alloy line according to the present invention contains the Sr of 0.005 quality %-0.05 quality %.Therefore, it is possible to provide the bolt with more excellent physical strength, and the embrittlement of aluminum alloy line can not be caused.It is further preferred that bolt aluminum alloy line according to the present invention contains the Sr of 0.005 quality %-0.03 quality %, and the ratio Zr/Sr between the content of Zr and the content of Sr is 3 to 50.By being 3 to 50 by the ratio set of Zr/Sr, can effectively prevent because of occur containing Zr to melt again and because of the aluminum alloy line caused containing Sr brittle.

[composition]

(Si:0.60%-1.5%)

Si is partly dissolved in alloy matrix aluminum together with Mg, to obtain the solution strengthening of aluminum alloy line.Si element in the artificial aging process of aluminum alloy line, forms precipitation etc. to improve intensity and to provide the predetermined mechanical property needed for bolt necessary element.By being 0.60% by the lower limit set of Si content, the effect of solution strengthening and age hardening suitably can be played.Therefore, it is possible to obtain the bolt of predetermined strength.By the upper limit of Si content is set as 1.5%, can not destroy by cast material to the processing characteristics of wire rod and the formability forming bolt, and can prevent the coarse crystallization material or the precipitate that are formed into source, crack, this contributes to making bolt have higher intensity.Preferred Si content is 0.80%-1.4%.Within the scope of this, be easy to the bolt obtaining there is more excellent physical strength.

(Fe:0.02%-0.40%)

Need Fe to be lifted at the effect of the grain-refining agent (comprising Ti) in the castingprocesses under alkali earth metal (as Mg and Sr) existence.It is 0.02% refinement that effectively can help crystal grain in alloy by the lower limit set of Fe content.On the other hand, the upper limit is set as that 0.40% can prevent the grain boundaries in alloy structure from producing Fe system crystalline material and making the plastic deformation ability deterioration of alloy.Preferred Fe content is 0.05%-0.30%.The content be more preferably is 0.05%-0.25%.Within the scope of these, be easy to the bolt obtaining there is more excellent physical strength.

(Cu:0.50%-1.2%)

Cu and Mg and Si contributes to improving intensity jointly.By being 0.50% by the lower limit set of Cu content, be easy to obtain this effect.On the other hand, by its upper limit is set as 1.2%, be easy to the formability ensureing bolt.Preferred Cu content is 0.80%-1.2%.Within the scope of this, be easy to obtain that there is more excellent physical strength and the bolt of good heat resistance.

(Mn:0.50%-1.1%)

Mn is partly dissolved in alloy matrix aluminum to realize the solution strengthening of aluminum alloy line.Mn can form Al-Mn system discrete particles, and the crystal grain of this line bar structure of refinement also improves intensity, formability, erosion resistance etc.By being 0.50% by the lower limit set of Mn content, reaching the solution strengthening of aluminum alloy line, being therefore easy to obtain sufficiently high intensity for bolt.By the upper limit is set as 1.1%, can prevent from becoming the coarse crystallization material in source, crack or the formation of precipitate, this contributes to the intensity that bolt reaches higher.The content of preferred Mn is 0.70%-1.1%.Within the scope of this, be easy to obtain that there is more excellent physical strength and the bolt of good heat resistance.

(Mg:0.70%-1.3%)

Mg be realize aluminum alloy line solution strengthening and in artificial aging process, be together formed with the precipitation that helps improve intensity with Si to meet the necessary element of mechanical property needed for bolt.By being 0.70% by the lower limit set of Mg content, sufficient solution strengthening function and age hardening function can be played.By the upper limit is set as 1.3%, can prevent from becoming the coarse crystallization material in source, crack or the formation of precipitate, this contributes to the intensity that bolt reaches higher.The content of preferred Mg is 0.80%-1.3%.Within the scope of this, be easy to obtain that there is more excellent physical strength and the bolt of good heat resistance.

(Cr:0.01%-0.30%)

Be similar to Mn and Zr, Cr can form discrete particles, and therefore heat-treating aluminum alloy line in the process with crystal grain thinning, it has the effect preventing grain coarsening.What the refinement of crystal grain contributed to improving bolt strength and bolt can formative.Cr is also improved the effect of erosion resistance.By being 0.01% by the lower limit set of Cr content, can suitably obtain these effects.By the upper limit is set as 0.30%, prevent the alligatoring of crystal grain, and suitably can play the effect of crystal grain thinning.Preferred content range is 0.05%-0.30%.The bolt that not only there is excellent intensity, also there is excellent thermotolerance can be obtained containing the Cr being more than or equal to 0.05%.

(Zn:0.005%-0.50%)

Zn have aluminum substrate mutually in dissolve and improve the function of alloy strength.By being 0.005% by the lower limit set of Zn content, the effect improving intensity suitably can be played.By the upper limit is set as 0.50%, suitable erosion resistance can be ensured.Preferred Zn content is 0.05%-0.25%.Within the scope of this, easily guarantee the toughness needed for obtaining bolt is shaped, and be easy to the bolt that obtains there is more excellent physical strength and excellent machinability, thermotolerance and erosion resistance.

(Ti:0.01%-0.20%)

Ti there is the crystalline structure of refinement cast material and the ratio reducing columnar grain in cast material to increase the effect of the ratio of equi-axed crystal.Therefore, rolling processing characteristics and the Wire Drawing performance of cast material can be improved containing Ti, and then improve the formability forming bolt.In addition, due to the refinement of crystalline structure, be not easy to produce defect in plastic processing.Therefore, it is possible to obtain having the plastic working material almost not having defective excellent surface state.By being 0.01% by the lower limit set of Ti content, be easy to the effect obtaining crystal grain thinning.Although Ti content is higher, the refinement of crystal grain is better with the effect reducing the defect relevant to refinement, and when content is about 0.20%, this effect seems to reach capacity, and also can prevent the generation of thick intermediate compound under this content.Therefore, the upper limit of Ti content is set as 0.20%.Preferred Ti content is 0.01%-0.10%.Within the scope of this, be easy to the bolt obtaining having more excellent mechanical strength.Ti can be mixed in TiB 2deng in molten metal, and B also has the refinement crystalline structure that is similar to Ti thus improves the effect of intensity.Therefore, allow containing being approximately less than or equal to 50ppm(mass ratio) B.

(Zr:0.05%-0.20%)

Similar with Mn, Zr also has formation and contains the discrete particles of each element and prevent from aluminum alloy line heat treatment process, grain coarsening occurring thus the effect of crystal grain thinning.Therefore, contribute to improving the intensity of bolt and forming the formability of bolt.Zr is also the necessary element of the thermotolerance improving aluminum alloy line.By being 0.05% by the lower limit set of Zr content, the intensity that can suitably be improved and form the effect of formability of bolt.By the upper limit is set as 0.20%, the alligatoring of crystal grain effectively can be prevented.Preferred Zr content is 0.10%-0.20%.Within the scope of this, be easy to obtain that there is more excellent physical strength and the bolt of good heat resistance.

(Mg 2si/ (Mn+Cr): 1.0 to 2.1)

Si and Mg is partly dissolved into contribute to improving intensity in alloy matrix aluminum, and surplus is Mg 2the form of Si.On the other hand, Cr and Mn all has and forms discrete particles and prevent structure alligatoring and be conducive to improving the function of intensity.By to Mg 2ratio between the content of Si and the total content of Cr and Mn limits, and can obtain the bolt with high mechanical strength and thermotolerance.Although its reason is still uncertain, it is believed that Mg 2si and Mn and Cr interacts, to prevent the strength degradation produced because of the carrying out of timeliness while keeping high temperature, and by adding and Mg 2mn and Cr that the amount of Si is corresponding thus improve its thermotolerance.Be 1.0 to 2.1 by this ratio set.Preferred ratio is about 1.4 to 2.0.Particularly preferred ratio is about 1.5 to 1.8.When carrying out aluminium alloy processing after artificial aging, it is believed that Mn and Cr prevents dislocation moving, and prevent the intensity of the part being made by work hardening intensity be improved to decline.The value calculated by the amount of Mg and Si added is used as Mg 2the content of Si.Specifically, Mg is obtained by expression 1 2the content of Si.This calculated value represents, by carrying out solution annealing and ageing treatment to separate out Mg 2si and Mg in the material obtained 2si content.The total content of Cr and Mn is preferably about 0.55%-1.5%, is more preferably about 0.70%-1.4%, and is particularly preferably about 0.75%-1.3%.

{ content [quality %]/(nucleidic mass × 2 of Mg) of Mg } × (Mg 2the molecular weight of Si)

Expression formula 1

(Sr:0.005%-0.05%)

Although Sr not indispensable element, also can containing Sr using as additional Addition ofelements.Sr also has the function of the crystalline structure of refinement cast material, and contributes to the intensity improving gained bolt.Specifically, if containing Sr under the existence of Zr, then can improve the intensity of aluminum alloy line and it can not be made brittle.By being 0.005% by the lower limit set of Sr content, be easy to reach the effect improving bolt strength.By the upper limit is set as 0.05%, then effectively can prevents the embrittlement of aluminum alloy line, and enough intensity can be obtained.The content of preferred Sr is 0.005%-0.03%.Within the scope of this, be easy to obtain that there is more excellent physical strength and the bolt of good heat resistance.

(Zr/Sr:3 to 50)

As mentioned above, Zr improves the element needed for thermotolerance, but if containing Zr, the fusing point of alloy will raise, and causes higher casting temp and is difficult to solidification.Comparatively speaking, billet continuous casting is not then had problems.But, when casting continuously, if shunk in the solidification process of molten metal, be then easy to the phenomenon of the outside surface distortion occurring cast material.This crushed element make cast material no longer with contacting dies, therefore cooling become slow.Due to the heat of cast material inside, can again occurrence temperature increase to over fusing point and cause the phenomenon that melts again, result causes the alligatoring of crystal grain and the deterioration of cast material surface quality.As a result, the part of the part of grain coarsening and surface quality deterioration easily become casting after rolling and drawing process in the source of defect.On the other hand, Sr has the function improving intensity of aluminum alloy, but easily causes embrittlement.By the ratio between Zr and Sr is limited in predetermined scope, just can effectively prevent due to cause containing Zr molten again and the generation of embrittlement owing to causing containing Sr.Can thinking, by being 3 by the lower limit set of this ratio, just containing the Zn relative to Sr appropriate amount, just effectively can prevent embrittlement and contribute to improving intensity.Can think, by the upper limit of this ratio is set as 50, just contain the Sr relative to Zn appropriate amount, just easily eliminate the defect of closing with melt-phase again.The preferred scope of this ratio is about 5 to 20.Within the scope of this, easily obtain and there is more excellent physical strength and the bolt of good heat resistance.Be not necessary in the present invention to the restriction of this ratio.

[wire diameter]

Aluminum alloy line according to the present invention has no particular limits, such as, can select the wire diameter of about 12mm to 3mm.When this aluminum alloy line has such wire diameter, manufacturing dimension the bolt of fastening auto parts etc. can be suitable for.

[manufacture method of aluminum alloy line]

Usually aluminum alloy line is manufactured by casting, rolling, line wire drawing and intermediate softening.Be described to the details of each step below.

[casting]

Casting has the cast material of above-mentioned composition.Continuous casting process is suitable for casting.In aluminum alloy line manufacture method of the present invention, by aluminium alloy being set to there is predetermined composition, the defective cast material possessing excellent surface quality of tool hardly can be obtained by continuous casting equally.Use such cast material can reduce the generation of crack and defect in rolling and drawing process, therefore, it is possible to obtain rolling stock and the wire drawing material with excellent surface performance.Specifically, in the manufacture method of aluminum alloy line of the present invention, the wire drawing material with excellent surface performance can be obtained, and without the need to as under normal circumstances, increase the peeling number in drawing process, increase the susceptibility of peeling amount or raising gamma defectoscope.Therefore, according to the manufacture method of aluminum alloy line of the present invention, the aluminum alloy line of good yield and excellent surface state can be had with good productivity manufacture.As Continuous casting process, preferred belt wheel technology (ベ Le ト ア Application De ホ イ ー Le mode).

Cooling in castingprocesses is preferably carried out being more than or equal under the speed of 5 DEG C/sec, is more preferably more than or equal to 8 DEG C/sec, and is more preferably more than or equal to 20 DEG C/sec again.By rate of cooling being set greater than or equaling 5 DEG C/sec, the alligatoring of crystal grain can be prevented, thus the cast material that the ratio obtaining having the equi-axed crystal in the cast material of fine structure or unit cross-sectional area is higher.Preferably, in process of cooling, in molten metal, the rate of cooling of optional position is more than or equal to 5 DEG C/sec, and that is, whole molten metal can cool equably.Such as, by using the continuous casting machine with the copper mould, Forced water cooling mechanism etc. of water-cooled just can obtain fast setting under above-mentioned rate of cooling.

[rolling]

Process is rolled to obtain rolling stock to cast material.Preferably, this rolling is hot rolling or warm-rolling.It is also preferred that rolling is carried out continuously together with casting.When rolling is carried out continuously together with casting, utilize the heat stored in cast material to be easy to carry out hot rolling, thus obtain high energy efficiency.In addition, the productivity of casting rolling material is also high than the productivity of casting in batches.Such as, use such casting machine, wherein, belt and wheel are combined, and milling train is connected in this casting machine.The example of such machine comprises Properzi continuous casting mill.

[wire drawing]

Wire drawing is carried out to rolling stock, to be processed as the wire drawing line rod with predetermined wire diameter.Line wire drawing is carried out preferably by cold drawn.According to the surface appearance of rolling stock before wire drawing, peeling processing can be carried out.

[intermediate softening]

Line rod in above-mentioned drawing process is carried out sofening treatment.This intermediate softening process is carried out under these conditions, and the line rod namely after this process will have the elongation being more than or equal to 10%.Carrying out this intermediate softening process is the intensity (intensity of this wire rod is improved by refinement crystalline structure and work hardening) extremely not reducing line rod in order to this line rod softening, increases the toughness of this line rod thus.

Suitably batch processing can be used for sofening treatment.For the atmosphere in sofening treatment, in order to prevent the heat in treating processes from producing oxide film on the surface of wire rod, be preferably non-oxidizing atmosphere.The example comprises: vacuum atmosphere (reduced atmosphere); Inert gas atmosphere, as nitrogen (N 2) or argon gas (Ar); Reducing gas atmosphere, as the gas containing hydrogen (e.g., only has hydrogen (H 2), or N 2, rare gas element and the hydrogen (H such as Ar or helium (He) 2) mixed gas) or containing gas (e.g., carbon monoxide (CO) and the carbonic acid gas (CO of carbon dioxide 2) mixed gas).

By carrying out sofening treatment being more than or equal under the Heating temperature of 250 DEG C, line rod can have the elongation being more than or equal to 10%.When batch processing, preferred condition comprises: Heating temperature is more than or equal to 250 DEG C and is less than or equal to 500 DEG C, and the hold-time is more than or equal to 0.5 hour, is more preferably and is more than or equal to 1 hour.If Heating temperature lower than 250 DEG C and the hold-time be less than 0.5 hour, then sofening treatment almost will not have effect.If Heating temperature is higher than 500 DEG C, then crystal grain and crystallization precipitate will alligatoring, and easily reduce its processing characteristics.Desirably Heating temperature be set greater than or equal 300 DEG C and be less than or equal to 450 DEG C especially, and the hold-time is for being more than or equal to 2 hours and being less than or equal to 40 hours.Again more preferably, Heating temperature is 380 DEG C to 420 DEG C, and the hold-time is for being less than or equal to 24 hours, is particularly less than or equal to 15 hours.

[other]

Also sofening treatment (final sofening treatment) can be carried out after final wire drawing.Final sofening treatment also can suitably carry out being more than or equal to 1 hour being more than or equal at 300 DEG C.Final sofening treatment can improve the formability in bolt processing.

[bolt]

[composition]

The composition of bolt and the composition of above-mentioned aluminum alloy line similar.

[mechanical property]

When aluminum alloy line has the first composition, bolt can obtain such performance after being shaped: tensile strength is more than or equal to 380MPa, and 0.2% proof stress is more than or equal to 350MPa, and elongation is more than or equal to 6%.When aluminum alloy line has the second composition, bolt can obtain such performance after being shaped: tensile strength is more than or equal to 400MPa, and 0.2% proof stress is more than or equal to 360MPa, and elongation is more than or equal to 6%.When aluminum alloy line has the 3rd composition, bolt can obtain such performance after being shaped: tensile strength is more than or equal to 430MPa, and 0.2% proof stress is more than or equal to 370MPa, and elongation is more than or equal to 6%.If aluminum alloy line contains the Sr of 0.005 quality %-0.05 quality %, then can obtain the bolt with excellent mechanical strength, and the embrittlement of aluminum alloy line can not be caused.If aluminum alloy line contains the Sr of 0.005 quality %-0.03 quality %, and if the ratio Zr/Sr between the content of Zr and the content of Sr is 3 to 50, then can obtain the bolt with more excellent mechanical strength, and can not cause due to melting again of occurring containing Zr, and the embrittlement of aluminum alloy line owing to occurring containing Sr.

Carry out bolt processing to aluminum alloy line after final wire drawing and add at bolt carrying out solution annealing and ageing treatment man-hour, all these performances can be obtained thus.Can tension test be adopted, measure any performance according to JISB1051, wherein, product bolt is used as test block.

[manufacture method of bolt]

Usually by cutting above-mentioned aluminum alloy line, cold pressure make the manufacture that processing, form rolling and solution annealing and ageing treatment carry out bolt.The bolt with the performance described in above-mentioned [mechanical property] part can be obtained thus.Be described to the details of each step below.

[cutting]

When cutting, above-mentioned aluminum alloy line is cut into the length being applicable to bolt processing.The length of gained cutting member suitably can be selected according to the size of the bolt that will manufacture.

[cold pressure makes processing]

Make cold pressure and add man-hour, forging is carried out to form the head of bolt to the end of the cutting member obtained in cutting step.Known condition can be used as processing conditions.

[form rolling]

When form rolling, in the cutting member obtained by cutting step, form threaded portion.Known condition can be used as processing conditions.Usually after carrying out cold pressure and making processing, rolling is formed.

[solution annealing+timeliness]

Solution annealing and ageing treatment are carried out to the target object that will be processed into bolt, to form precipitate in the alloy and to improve the intensity of this target object.The operation of carrying out this solution annealing and timeliness comprises following mode:

(1) cut-cold pressure and make processing-solution annealing+timeliness-form rolling

(2) cutting-middle forging-solution annealing+timeliness-cold pressure makes processing-form rolling, or

Cutting-solution annealing+timeliness-cold pressure makes processing-form rolling

That is, can carry out or not carry out centre forging.

(3) cut-cold pressure and make processing-form rolling-solution annealing+timeliness

(4) cutting-solution annealing-cold pressure makes processing-form rolling-timeliness, or that is cutting-solution annealing-preageing-cold pressure makes processing-form rolling-timeliness, can carry out or not carry out preageing.

(5) solution annealing-wire drawing-cutting-cold pressure makes processing-timeliness-form rolling

(6) solution annealing-wire drawing-cutting-middle forging-timeliness-cold pressure makes processing-form rolling

(7) solution annealing-wire drawing-cutting-cold pressure makes processing-form rolling-timeliness.

In aforesaid way, for mode (1), (2), (5) and (6), by forming rolling in a final step, threaded portion is made to have high dimensional precision.In addition, by form rolling, plastic working is carried out to the part that will become threaded portion, make starting material be able to work hardening, therefore, it is possible to improve the intensity of bolt a little.

For mode (2) and (6), by carrying out plastic working after timeliness, starting material can processedly be hardened, and therefore intensity also can improve further.

For mode (3), (4) and (7), plastic working was carried out before timeliness.Therefore, material relatively low for processing characteristics can be made screw.For mode (7), wherein plastic working carries out when almost not having precipitate, material lower for low processing characteristics can be made screw.

For mode (4), (5), (6) and (7), plastic working is carried out after solution annealing, therefore the refinement of crystal grain can occur and cause strain.Therefore, compared with carrying out the situation of solution annealing after plastic working, the intensity of bolt can be improved.

For any one mode, at 520 DEG C to 560 DEG C, suitably carry out solution annealing 1 little of 5 hours, and at 160 DEG C to 180 DEG C, suitably carry out ageing treatment 4 little of 30 hours.By this solution annealing and ageing treatment, control Mg can also be passed through 2the precipitation state of Si and adjust the mechanical property of bolt.It should be noted that when carrying out Pre-aging treatment, suitably heat-treating about 4 little of 50 hours at 50 DEG C to 160 DEG C.

[embodiment]

< test example 1>

Aluminum alloy line is manufactured according to the step of casting-rolling-line wire drawing-intermediate softening-line wire drawing.In the fabrication process, the surface quality of cast material and wire drawing material is evaluated.In addition, the aluminum alloy line of gained is processed into bolt, and the crack in forming process and thermotolerance are evaluated.Also have rated the mechanical property of bolt.The composition of each sample is as shown in table 1, and primary evaluation result is as shown in table 2.In tables 1 and 2, comparative example 1 is the material being equivalent to A6056.

The manufacture >> of << alloy wire

First, the fine aluminium as base material is dissolved, and Addition ofelements is put in its molten metal to make it that there is predetermined concentration.Through the al alloy molten metal of adjustment, suitable hydrogen Processing for removing and foreign matter Processing for removing are carried out to component.Cast and hot rolling by the molten metal of belt wheel continuous casting mill to this aluminum alloy line, to manufacture the wire rod of φ 9.5mm.Rate of cooling in castingprocesses is set greater than or equals 5 DEG C/sec.Water-cooled copper mold is used all to be more than or equal to 5 DEG C/sec to make the rate of cooling of optional position in molten metal in process of cooling.By preparation Al-3%Ti-1%B(quality %) wire rod casting in the mode that molten metal and wire rod are fed in mould simultaneously, thus add Ti and B being used for structure refinement.Then, this line rod is cold drawn to φ 8.3mm, and carries out the intermediate softening process of 5 hours in the mode of batch processing at 400 DEG C.This softener material is stretched to φ 7.05mm further.The alloy wire of gained is carried out at 350 DEG C the final sofening treatment of 5 hours in the mode of batch processing, thus obtain described aluminum alloy line.It should be noted that the addition of the Si owing to comprising in each sample has exceeded stoichiometric composition, therefore Mg in table 1 2the content of Si is calculated by following formula

{ content [quality %]/(nucleidic mass × 2 of Mg) of Mg } × (Mg 2the molecular weight of Si)

Expression formula 1

<< is molten evaluation >> partly again

The cast material of gained is suitably sampled, and outward appearance is observed to evaluate the number of the molten again part caused owing to melting again in solidification process.Contain the number of molten part again between the sample of Sr and the sample not containing Sr by contrast thus partly make evaluation to molten again.

<< flaw detection number evaluates >>

The rolling stock obtained by continuous casting rolling is stretched to 11.7mm, and in this stage, uses peeling mould to carry out to it peeling that thickness is 0.2mm.It should be noted that and can not remove the peel.By peeling, the relatively little defect produced by other factors (as hot rolling and wire drawing subsequently) outside melting again can be removed.By following manner, flaw detection number is evaluated: first use the online eddy current flaw detec provided for drawing wire machine to observe the defect counts of the above-mentioned material surface that will remove the peel, and place mark in flaw detection counting position, then compare sample containing Sr and not containing Sr sample between flaw detection number.

The manufacture >> of << bolt

Bolt is manufactured by obtained aluminum alloy line.In the present embodiment, obtain the T6 process material for M8 bolt, and the T9 process material obtained by carrying out cold working (middle forging) to T6 process material.The manufacture method of each bolt is as follows.For each bolt, at 550 DEG C, carry out solution annealing 2 hours, and at 175 DEG C, carry out ageing treatment 8 hours.Notice, owing to there is crack in the course of processing of T9 process material, therefore thermotolerance test described later and mechanical property evaluation are not carried out to comparative example 4 and 5.

T6 process material

Cut-cold pressure and make processing-solution annealing-ageing treatment-form rolling

T9 process material

Cutting-middle forging-solution annealing-ageing treatment-cold pressure makes processing-form rolling

T8 process material

Cutting-solution annealing-cold pressure makes processing-form rolling-timeliness

The evaluation >> in crack in << bolt

The incidence in crack in obtained 500 bolts is evaluated.The crack that produces in the processes such as processing, form rolling is made to determine the existence in crack cold pressure by visual observation.Evaluation is made by comparing the incidence in crack between the sample containing Sr and the sample not containing Sr.

<< thermotolerance test >>

Obtained bolt is kept 1000 hours at 150 DEG C, then at room temperature carries out tension test, relative to the rate of descent of tensile strength before thermal treatment, thermotolerance is evaluated by the tensile strength after thermal treatment.Using comparative example 1 as reference, be C by sample lower for rate of descent deciding grade and level, the sample with same rate of descent is defined the level as B, and be A by the sample deciding grade and level of rate of descent raising more than 20%.Rate of descent improves more than 20% and refers to, such as suppose that the rate of descent of comparative example 1 is 10%, then the rate of descent of sample will be less than or equal to 8%.

The evaluation >> of << mechanical property

At room temperature, bolt is used to carry out tension test as sample, to evaluate tensile strength, 0.2% proof stress and elongation.This tension test is carried out according to JIS B1051.It should be noted that for above-mentioned T9 process material, only list its tensile strength and 0.2% proof stress in table 2.

[table 2]

Owing to there is crack in the course of processing of T9 process material, therefore comparative example 4 and 5 is not evaluated.

<< inquires into >>

As shown in Tables 1 and 2, (wherein Mg in embodiment 1 to 10 2si/ (Mn+Cr) is 1.0 to 2.1) tensile strength of T6 process material is more than or equal to 380MPa(specifically, be more than or equal to 420MPa), 0.2% proof stress is more than or equal to 350MPa(specifically, be more than or equal to 370MPa), elongation is more than or equal to 6%, and has good thermotolerance.T9 process material in embodiment 1 to 10 has higher physical strength, such as, tensile strength is more than or equal to 460MPa(specifically, is more than or equal to 490MPa), 0.2% proof stress is more than or equal to 440MPa(specifically, is more than or equal to 480MPa).Can see, compare with the embodiment 1 with the first composition with 8, tensile strength and 0.2% proof stress with the T9 process material of the embodiment 10 of the second composition are improved.Specifically, the tensile strength with the embodiment 2 to 7 of the 3rd composition and the T6 process material of embodiment 9 is more than or equal to 430MPa, and 0.2% proof stress is more than or equal to 370MPa, and elongation is more than or equal to 6% and has excellent thermotolerance.The tensile strength of the T9 process material of embodiment 2 to 7 and embodiment 9 is more than or equal to 510MPa, and 0.2% proof stress is more than or equal to 500MPa, and has high heat resistance.The tensile strength of the T8 process material of embodiment 7 is 502MPa and 0.2% proof stress is 482MPa, and has high heat resistance.With do not compare with embodiment 10 containing the embodiment 1 to 6 of Sr, containing being more than or equal in the embodiment 7 to 9 of Sr of 0.005%, then the number in molten, flaw detection number and crack all decreases.On the other hand, for Mg 2si/ (Mn+Cr) not within the scope of 1.0 to 2.1 or meets the comparative example 1 to 5 of the first composition, its thermotolerance and processing characteristics (crack) aspect good all not.Specifically, the thermotolerance increasing amount without any comparative example is more than or equal to 20%.

It is noted that the present invention is not limited to above-mentioned embodiment, and suitably can be improved in the scope not departing from the present invention's essence main points.

Industrial applicibility

The plain line of bolt is applicable to or for the manufacture of bolt with plain line according to the manufacture method of aluminum alloy line of the present invention and this aluminum alloy line.Manufacture method according to bolt of the present invention and this bolt can be suitable for being used as in order to the bolt of fastening trolley part or for the manufacture of this bolt.

Claims (7)

1. a bolt aluminum alloy line, contains:
The Si of 0.60 quality %-1.5 quality %;
The Fe of 0.02 quality %-0.40 quality %;
The Cu of 0.50 quality %-1.2 quality %;
The Mn of 0.50 quality %-1.1 quality %;
The Mg of 0.70 quality %-1.3 quality %;
The Cr of 0.01 quality %-0.30 quality %;
The Zn of 0.005 quality %-0.50 quality %;
The Ti of 0.01 quality %-0.20 quality %;
The Zr of 0.05 quality %-0.20 quality %, and
The Sr of 0.005 quality %-0.05 quality %,
Surplus is Al and subsidiary impurity,
A part in described Si and Mg comprised is Mg 2the form of Si, and
Mg 2ratio Mg between the content of Si and the total content of Mn and Cr 2si/ (Mn+Cr) is 1.0 to 2.1.
2. bolt aluminum alloy line according to claim 1, contains:
The Si of 0.80 quality %-1.4 quality %;
The Fe of 0.05 quality %-0.30 quality %;
The Cu of 0.50 quality %-1.2 quality %;
The Mn of 0.50 quality %-1.1 quality %;
The Mg of 0.80 quality %-1.3 quality %;
The Cr of 0.05 quality %-0.30 quality %;
The Zn of 0.05 quality %-0.25 quality %;
The Ti of 0.01 quality %-0.10 quality %; With
The Zr of 0.10 quality %-0.20 quality %.
3. bolt aluminum alloy line according to claim 2, contains:
The Cu of 0.80 quality %-1.2 quality %;
The Mn of 0.70 quality %-1.1 quality %; With
The Cr of 0.05 quality %-0.30 quality %.
4. bolt aluminum alloy line according to claim 1, the Sr containing 0.005 quality %-0.03 quality %, wherein,
Ratio Zr/Sr between the content of Zr and the content of Sr is 3 to 50.
5. manufacture a method for bolt aluminum alloy line, comprise the steps:
Obtain cast material, this cast material contains
The Si of 0.60 quality %-1.5 quality %,
The Fe of 0.02 quality %-0.40 quality %,
The Cu of 0.50 quality %-1.2 quality %,
The Mn of 0.50 quality %-1.1 quality %,
The Mg of 0.70 quality %-1.3 quality %,
The Cr of 0.01 quality %-0.30 quality %,
The Zn of 0.005 quality %-0.50 quality %,
The Ti of 0.01 quality %-0.20 quality %,
The Zr of 0.05 quality %-0.20 quality %, and
The Sr of 0.005 quality %-0.05 quality %,
Surplus is Al and subsidiary impurity,
A part in described Si and Mg comprised is Mg 2the form of Si, and Mg 2ratio Mg between the content of Si and the total content of Mn and Cr 2si/ (Mn+Cr) is 1.0 to 2.1;
Rolling stock is obtained by being rolled described cast material;
The wire drawing line rod of predetermined wire diameter is obtained having by carrying out wire drawing to described rolling stock; And
In 250 DEG C at 500 DEG C, the 0.5 little sofening treatment up to 40 hours is carried out to the described line rod in described line drawing step process.
6. the bolt formed by aluminium alloy,
Described aluminium alloy contains
The Si of 0.60 quality %-1.5 quality %,
The Fe of 0.02 quality %-0.40 quality %,
The Cu of 0.50 quality %-1.2 quality %,
The Mn of 0.50 quality %-1.1 quality %,
The Mg of 0.70 quality %-1.3 quality %,
The Cr of 0.01 quality %-0.30 quality %,
The Zn of 0.005 quality %-0.50 quality %,
The Ti of 0.01 quality %-0.20 quality %,
The Zr of 0.05 quality %-0.20 quality %, and
The Sr of 0.005 quality %-0.05 quality %,
Surplus is Al and subsidiary impurity,
A part in described Si and Mg comprised is Mg 2the form of Si, and Mg 2ratio Mg between the content of Si and the total content of Mn and Cr 2si/ (Mn+Cr) is 1.0 to 2.1,
Described bolt has
Be more than or equal to the tensile strength of 380MPa,
Be more than or equal to 0.2% proof stress of 350MPa, and
Be more than or equal to the elongation of 6%.
7. manufacture a method for bolt, comprise the steps:
Described bolt aluminum alloy line claim 1 defined is cut to predetermined length;
Cold pressure is carried out to the bolt aluminum alloy line after cutting and makes processing with the head forming bolt;
Rolling is formed to form the threaded portion of bolt to the bolt aluminum alloy line after described cutting; And
To by described bolt aluminum alloy line, the target object manufactured in the process of bolt carries out solution annealing and ageing treatment.
CN201280007038.0A 2011-11-16 2012-11-14 Aluminum alloy wire for use in bolts, bolt, and manufacturing method of these. CN103339276B (en)

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JP6368087B2 (en) * 2013-12-26 2018-08-01 住友電気工業株式会社 Aluminum alloy wire, method for producing aluminum alloy wire, and aluminum alloy member
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