CN105555976B - The manufacture method and automobile component of high-carbon electric-resistance-welded steel pipe - Google Patents
The manufacture method and automobile component of high-carbon electric-resistance-welded steel pipe Download PDFInfo
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- CN105555976B CN105555976B CN201480051527.5A CN201480051527A CN105555976B CN 105555976 B CN105555976 B CN 105555976B CN 201480051527 A CN201480051527 A CN 201480051527A CN 105555976 B CN105555976 B CN 105555976B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
- B21C37/0807—Tube treating or manipulating combined with, or specially adapted for use in connection with tube making machines, e.g. drawing-off devices, cutting-off
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/30—Finishing tubes, e.g. sizing, burnishing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
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Abstract
The present invention provides the high-carbon electric-resistance-welded steel pipe with the excellent electric resistance welding portion of reliability.C will be contained in terms of quality %：0.30~0.60%, Si：0.05~0.50%, Mn：0.30~2.0%, Al：Less than 0.50%, N：Less than 0.0100% and the high carbon steel sheet constituted that is made up of Fe and inevitable impurity of surplus as former material steel plate, by cold working by former material steel formability be substantially cylindrical shape, when carrying out electric resistance welding and electric-resistance-welded steel pipe be made, after the electric resistance welding, it is less than 0.8% cold drawn deep rolling to implement drawing coefficient, then, reheated after being reheated or cooled down immediately, more than 850 DEG C within the temperature range of implement diameter reducing rate for more than 10% pyrocondensation footpath roll.Thus the defect for suppressing electric resistance welding portion is produced, and is formed the excellent electric resistance welding portion of reliability, can be obtained the high-carbon electric-resistance-welded steel pipe that reliability is significantly improved.In addition, by the way that using such high-carbon electric-resistance-welded steel pipe as former material, the reliability of automobile component is also improved.
Description
Technical field
The present invention relates to the manufacture method of the high-carbon electric-resistance-welded steel pipe for the hollow mechanical part for being suitable as automobile etc. and
The reliability of automobile component, more particularly to electric resistance welding portion is improved.
Background technology
The present invention relates to the height for the hollow mechanical part (hollow mechanical part) for being suitable as automobile etc.
The manufacture of carbon resistance Coiling Welded Pipe (high carbon electric resistance welded steel pipe or tube)
Method.Especially, the present invention is the hair of the raising for the reliability for being related to electric resistance welding portion (electric resistance weld)
It is bright.
In recent years, from the viewpoint of environment of preserving our planet (global environment), the strong combustion for expecting automobile
Expect that efficiency improves (improvement of fuel efficiency), body of a motor car (automotive body) is pointed to strongly
Lightweight (weight saving).Therefore, replace in the past used with former material using hollow former material as automobile component
Solid former material (solid material).The hollow former material for the part being heat-treated the need for as use in automobile etc., especially
It is that well and from the viewpoint of skin decarburization (surface decarburization) less, have studied conduct from dimensional accuracy
The mechanical structure high-carbon steel of high-carbon steel (high carbon steel for mechanical structural use)
The utilization of electric-resistance-welded steel pipe.
But, for mechanical structure with for high-carbon steel, carbon amounts increases, therefore, intensity increase, elongation reduction, and
And show that segregation (segregation) becomes strong tendency.Therefore, under the segregation portion of the strong segregation such as C, Mn and P, high temperature
The decline of hot-workability (hot workability) becomes notable, and electric resistance welding becomes difficulty or because of segregation portion in electricity in itself
Welding resistance portion often produces the defects such as heat cracking (hot cracking), problematic as the processability residual of steel pipe.
For it is such the problem of, for example, having recorded a kind of mechanical structure high-carbon steel in patent document 1
The electric-resistance-welded steel pipe of (mechanical structural high carbon steel), it contains C in terms of quality %：0.4~
0.8%th, Si：0.15~0.35%, Mn：0.3~2.0%, P：Less than 0.030%, S：Less than 0.035%, Al：0.035% with
Under, also added with Mo：0.05~0.15%, surplus is made up of Fe and inevitable impurity.The technology recorded in patent document 1
In, it by adding Mo, can significantly improve the processability under more than 1000 DEG C of hot-working, form the excellent machine of hot-workability
The steel electric-resistance-welded steel pipe of tool structure high-carbon steel.
In addition, a kind of manufacture method of the electric-resistance-welded steel pipe of high working property high-carbon steel has been recorded in patent document 2, its
In, C will be contained in terms of quality %：0.3~0.6%, Si：0.15~0.35%, Mn：0.3~1.5%, P：Less than 0.012%,
S：Less than 0.035%, Al：Less than 0.035% and continuous casting (continuous cast) after center segregation portion (center
Segregation part) P concentration be adjusted in the low-level high-carbon steel with meeting particular kind of relationship in the relation of C concentration
Slab carry out hot rolling, the hot rolled coil of obtained high-carbon steel is manufactured into electric-resistance-welded steel pipe as former material.Remembered according to patent document 2
The technology of load, heat cracking during electric resistance welding is suppressed, and yield rate is improved.In addition, the technology recorded according to patent document 2, i.e.,
Make, by the harsh processing such as expansion forming (bulge forming), brittle crack (embrittlement to be produced in segregation portion
Crack possibility) is also low, and the processability of the electric-resistance-welded steel pipe of high-carbon steel is improved.
In addition, having recorded a kind of system of the electric-resistance-welded steel pipe of high working property mechanical structure high-carbon steel in patent document 3
Method is made, wherein, C will be contained in terms of quality %：0.30~0.60%, P：Less than 0.012% high-carbon steel carries out continuous casting and made
P concentration into center segregation portion is adjusted in the low-level high-carbon steel slab with meeting particular kind of relationship in the relation of C concentration
(high-carbon steel slab), carries out hot rolling to the high-carbon steel slab, regard the hot rolled coil of obtained high-carbon steel as original
Material, is made after the open pipe (open pipe) of cylindrical shape using roller group is shaped, by the preferred system in the two edges (both edges) of open pipe
Into making width of heating than generally wide 2~4mm and being preheated to 800~1000 DEG C, electric resistance welding is carried out, then, by electric resistance welding portion
Carry out air cooling.The technology recorded according to patent document 3, heat cracking during electric resistance welding is suppressed, and yield rate is improved, and resistance
The hardness reduction in weldering portion, even if being processed by harshnesses such as expansion formings, can also prevent the crackle of weld part, the electricity of high-carbon steel
The processability of welding resistance steel pipe is improved.
In addition, a kind of heat treatment method in electric resistance welding portion has been recorded in patent document 4, wherein, to containing C：0.03~
0.30%th, Si：0.50~3.00%, Mn：The electric-resistance-welded steel pipe of 0.30~3.00% composition carries out electric resistance welding, then, by it
Weld part is heated to after 800~1000 DEG C, from Ar3More than transformation temperature start to be quenched with 20~200 DEG C/sec, make remaining Austria
Family name's body (retained austenite) is remained in electric resistance welding portion, so as to improve the processability in electric resistance welding portion.According to patent text
The technology of 4 records is offered, the ductility (ductility) in electric resistance welding portion is improved, and formation can also be resistant to hydroforming (hydro
The electric-resistance-welded steel pipe of strict processing such as forming).
Prior art literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 04-263039 publications
Patent document 2：Japanese Unexamined Patent Publication 11-156433 publications
Patent document 3：Japanese Unexamined Patent Publication 11-226634 publications
Patent document 4：Japanese Unexamined Patent Publication 11-323442 publications
The content of the invention
Invent problem to be solved
Recently, particularly ensure from the security of automobile etc. from the viewpoint of (ensuring safety), to automobile etc.
Part strictly requires to keep high reliability.Particularly in the case where using electric-resistance-welded steel pipe as part former material, resistance
Coiling Welded Pipe requirement possesses the electric resistance welding portion with reliability higher than ever.But, in the technology that patent document 1~4 is recorded,
There are the following problems：Produce can not fully meet with the fatigue strength in electric resistance welding portion (fatigue strength) for representative can
By property required value (requisite performance for reliability) situation.
It is an object of the invention to solve the above problems, and provide the high-carbon steel with the excellent electric resistance welding portion of reliability
The manufacture method of electric-resistance-welded steel pipe.It should be noted that " reliability is excellent " described herein refers to be not present in electric resistance welding portion
The situation of the defect impacted to fatigue strength.Specifically, following situation is referred to：With depth 0.2mm × length 12.5mm
Breach (notch) on the basis of, on defect detection on ultrasonic basis, although also depending on JIS G 0582, " ultrasonic wave of steel pipe is visited
The segmentation UA of triage checking method ", but carrying out 6db to be detected a flaw with higher sensitivity to fine defect
Defect is 0 in the ultrasonic test of (decibel, decibel) sensitivity amplification (sensitivity enhancement),
And distorting stress (torsional stress) τ of outer surface is being set as 350MPa and repeat number is until 2,000,000 times are
Do not cracked in torsional fatigue test (torsion fatigue test) only.
Method for solving problem
In order to achieve the above object, the present inventor is low for its reliability for the electric-resistance-welded steel pipe of existing high-carbon steel
Reason has made intensive studies.The discovery of its result, this is because, for the electric-resistance-welded steel pipe of existing high-carbon steel, in electricity
Welding resistance portion easily remains the defects such as crackle.For the electric-resistance-welded steel pipe of existing high-carbon steel, from be accurately adjusted to rule
The necessity of fixed size shape considers that carrying out sizing (sizing), bending using cold working generally after electric resistance welding terminates rectifys
Just (straightening).Think due to the drawing roll, detorsion and make using electric resistance welding harden after electric resistance welding portion production
Raw crackle, reliability reduction.
Therefore, in the case of the electric-resistance-welded steel pipe of high-carbon steel, it is considered to only electric resistance welding portion is carried out after electric resistance welding terminates
Normalizing (normalizing), then, the processing such as sizing, detorsion is carried out with cold working mode.But, even with above-mentioned
Method, can not obtain the abundant raising of reliability.It is not clear at this stage for its reason, but speculate and shrinkage cavity shape defect
(defects such as shrinkage cavities) related possibility is high.It is thought that because, in the electricity of mild steel
In welding resistance, generally, weld part is extruded by using compression roller (squeeze roll) to prevent shrinkage cavity shape defect, but
In the electric resistance welding of high-carbon steel, therefore fusing point step-down, is even all remaining fusing department (melting from compression roller after sometimes
Section), shrinkage cavity shape defect is easily produced.
Based on above-mentioned situation, for the reliability of the electric-resistance-welded steel pipe that further improves high-carbon steel, the present inventor expects not
Only merely electric resistance welding portion is implemented to be heat-treated and improve ductility, in addition it is also necessary to implement the contracting that will be produced in electric resistance welding portion in the lump
The processing of poroid defect crushing (drawing rolls (reducing)).
Moreover, further study as a result, the inventors discovered that following method is effective：In order to further improve height
The reliability of the electric-resistance-welded steel pipe of carbon steel, the cold working such as the firm correction carried out after electric resistance welding are suppressed in required bottom line, so
Reheated afterwards, more than 850 DEG C within the temperature range of, with more than 10% diameter reducing rate (reducing rate of
Diameter the rolling of pyrocondensation footpath) is implemented.In addition, it has been found that when reheating, the heat time can be shortened simultaneously using sensing heating
And decarburization can be suppressed.
Basic experimental result as the present invention is illustrated.
0.37% C, 0.25% Si, 1.50% Mn, 0.025% Al, 0.004% will be contained in terms of quality %
N, 0.02% Ti, the high carbon steel sheet (thickness of slab of 0.002% B composition：It is cold using multiple rollers 7.9mm) as former material steel plate
Substantially cylindrical shape is configured to, relative end face is abutted each other, electric resistance welding is carried out, so that electric-resistance-welded steel pipe (external diameter is made
89.1mmφ).After electric resistance welding is carried out, with cold working mode, using precision mill, with 0~1.2% drawing coefficient
(reducing rate) implements cold drawn deep rolling.For resulting electric-resistance-welded steel pipe, surpassed especially for electric resistance welding portion
Sonic flaw detection checks (ultrasonic inspection), determines the number (defect number) of rejected region.Ultrasonic examination
(ultrasonic flaw detection) is carried out 6db sensitivity on the basis of depth 0.2mm × length 12.5mm breach and put
It is big to carry out.Resulting result is shown in Figure 1.
It can be seen from Fig. 1, when the drawing coefficient of cold drawn deep rolling is more than 0.8%, defect, which is produced, becomes notable.
In addition, after electric resistance welding, it is 0.1% cold drawn deep rolling to carry out the drawing coefficient of cold drawn deep rolling, then, immediately
980 DEG C are again heated to, makes the diameter reducing rate within the temperature range of more than 850 DEG C be changed to 35% to implement the rolling of pyrocondensation footpath from 0.It is right
In resulting electric-resistance-welded steel pipe, ultrasonic examination inspection is carried out to electric resistance welding portion, the number (defect of rejected region is determined
Number).The condition of ultrasonic examination inspection be set as with it is same after electric resistance welding.Resulting result is shown in Figure 2.According to Fig. 2
Understand, be less than in diameter reducing rate in the rolling of 10% pyrocondensation footpath, significantly, diameter reducing rate is more than 10% for the generation of the defect in electric resistance welding portion
When, the generation of defect is substantially reduced.
The present invention is further to be studied and completed based on above-mentioned opinion.That is, purport of the invention is as described below.
(1) a kind of manufacture method of the electric-resistance-welded steel pipe of high-carbon steel, by cold working by former material steel formability for substantially justify
After barrel shape, relative end face is abutted each other, electric resistance welding is carried out and electric-resistance-welded steel pipe is made, the manufacture of the electric-resistance-welded steel pipe
Method is characterised by, above-mentioned former material steel plate is set as to contain C in terms of quality %：0.30~0.60%, Si：0.05~
0.50%th, Mn：0.30~2.0%, Al：Less than 0.50%, N：Less than 0.0100% and surplus by Fe and inevitable impurity
The high carbon steel sheet of the composition of composition, after above-mentioned electric resistance welding, it is less than 0.8% cold drawn deep rolling to implement drawing coefficient, then,
Reheated after being reheated or cooled down immediately, more than 850 DEG C within the temperature range of implement diameter reducing rate be 10% with
On pyrocondensation footpath rolling, so that the excellent electric resistance welding portion of reliability is made.
(2) manufacture method of the electric-resistance-welded steel pipe of the high-carbon steel as described in (1), it is characterised in that in the base of above-mentioned composition
On plinth, further contained in terms of quality % and be selected from Cu：Less than 1.0%, Ni：Less than 1.0%, Cr：Less than 1.2%, Mo：1.0%
Below, W：More than one or both of less than 1.5%.
(3) manufacture method of the electric-resistance-welded steel pipe of the high-carbon steel as described in (1) or (2), it is characterised in that in above-mentioned composition
On the basis of, further contained in terms of quality % and be selected from Ti：Less than 0.04%, Nb：Less than 0.2%, V：One in less than 0.2%
Plant or two or more.
(4) manufacture method of the electric-resistance-welded steel pipe of the high-carbon steel as any one of (1)~(3), it is characterised in that
On the basis of above-mentioned composition, further contain B in terms of quality %：0.0005~0.0050%.
(5) manufacture method of the electric-resistance-welded steel pipe of the high-carbon steel as any one of (1)~(4), it is characterised in that on
State the heating reheated to be carried out using high-frequency induction heating means.
(6) a kind of automobile component, it is characterised in that to use the electric resistance welding of the high-carbon steel any one of (1)~(5)
The electric-resistance-welded steel pipe of the high-carbon steel of the manufacture method manufacture of steel pipe is manufactured and obtained as former material.
(7) automobile component as described in (6), wherein, above-mentioned automobile component is front fork (front fork), rack (rack
Bar), drive shaft (drive shaft), track rod (tie rod), stator axis (stator shaft), camshaft (cam
Shaft any one in).
Invention effect
It is suppressed and the high-carbon steel in the excellent electric resistance welding portion of reliability according to the present invention it is possible to obtain producing with defect
Electric-resistance-welded steel pipe.As a result, according to the present invention, the reliability of the electric-resistance-welded steel pipe of high-carbon steel is significantly improved.In addition, according to this
Invention, the hollow part (hollow parts) using the electric-resistance-welded steel pipe of high-carbon steel as former material, such as front fork, rack, driving
The reliability of the various automobile components such as axle, track rod, stator axis, camshaft is also improved.
Brief description of the drawings
Fig. 1 is that the drawing coefficient for representing cold drawn deep rolling produces the figure for the influence that number is brought to the defect in electric resistance welding portion.
Fig. 2 is that the diameter reducing rate for representing the rolling of pyrocondensation footpath produces the figure for the influence that number is brought to the defect in electric resistance welding portion.
Embodiment
The present invention is the manufacture method of the electric-resistance-welded steel pipe of high-carbon steel.In the present invention, former material steel plate is set as high-carbon
Steel plate, the electric-resistance-welded steel pipe of high-carbon steel is made using the manufacture method of conventional electric-resistance-welded steel pipe.It should be noted that herein
Also steel band is included in described " steel plate ".
First, the composition restriction reason to the high carbon steel sheet as former material steel plate is illustrated.Hereinafter, as long as no special
Illustrate, then quality % is abbreviated as %.
Contain C as the steel plate of former material steel plate in the present invention：0.30~0.60%, Si：0.05~0.50%, Mn：0.30
~2.0%, Al：Less than 0.50%, N：Less than 0.0100%.In addition, can contain as the steel plate of former material steel plate in the present invention
Selected from Cu：Less than 1.0%, Ni：Less than 1.0%, Cr：Less than 1.2%, Mo：Less than 1.0%, W：One kind in less than 1.5% or
It is two or more.Ti is selected from addition, can contain as the steel plate of former material steel plate in the present invention：Less than 0.04%, Nb：0.2% with
Under, V：More than one or both of less than 0.2%.In addition, B can be contained as the steel plate of former material steel plate in the present invention：
0.0005~0.0050%.Surplus in addition to above-mentioned neccessary composition and any condition is Fe and inevitable impurity.Need
Illustrate, in order to improve the reliability in electric resistance welding portion, from the viewpoint of oxide is discharged by electric resistance welding portion, former material steel plate
Thickness of slab is preferably set to below 8mm.
C：0.30~0.60%
C is that occur solid solution or separated out in the way of carbide, carbonitride and contribute to the increased element of intensity.In order to
Obtain such effect and ensure the steel strength after desired steel strength, heat treatment, C content be set as 0.30% with
On.It should be noted that " desired steel strength " described herein refers to that tensile strength TS is more than 1200MPa.It is another
Aspect, when C content is more than 0.60%, the toughness reduction after heat treatment.Therefore, C content is defined to 0.30~0.60% scope.
Si：0.05~0.50%
Si is the element played a role as deoxidier.In order to obtain such effect, Si contents be set as 0.05% with
On.On the other hand, when Si contents are more than 0.50%, effect saturation, it is unfavorable economically to become, and can promote in electric resistance welding
The generation of field trash, the integrity to electric resistance welding portion brings harmful effect.Therefore, Si contents are defined to 0.05~0.50% model
Enclose.Additionally, it is preferred that being 0.10~0.30%.
Mn：0.30~2.0%
Mn is the element for occurring solid solution and contributing to intensity increase, quenching degree to improve.In order to obtain such effect, Mn contains
Amount is set as more than 0.30%.On the other hand, when Mn contents are more than 2.0%, the toughness formed after retained austenite, temper
Reduction.Therefore, Mn contents are defined to 0.30~2.0% scope.Additionally, it is preferred that being 0.8~1.6%.
Al：Less than 0.50%
Al is the element played a role as deoxidier.In order to obtain such effect, Al content is preferably set to
More than 0.01%.On the other hand, when Al content is more than 0.50%, effect saturation, it is impossible to the effect being consistent with content is expected, in warp
It is unfavorable to become in Ji, and can promote in electric resistance welding the generation of field trash, and the integrity to electric resistance welding portion brings harmful effect.
Therefore, Al content is defined to less than 0.50% scope.Additionally, it is preferred that being 0.02~0.04%.
N：Less than 0.0100%
N is to form nitride or carbonitride and the element useful for ensuring to be heat-treated intensity after (tempering).In order to
Such effect is obtained, more than 0.0005% is preferably comprised.When N content is more than 0.0100%, thick nitride is formed sometimes,
Toughness, endurance service life reduction.Therefore, N content is defined to less than 0.0100%.It should be noted that in the situation containing Ti
Under, N in the way of meeting following formula in the relation of Ti contents preferably by with being adjusted.
N/14≤Ti/47.9
(here, N, Ti are the content (quality %) of each element)
Mentioned component is the basis of the steel plate as former material steel plate.In the present invention, on the basis that this is constituted substantially
On, it further can selectively contain as needed and be selected from Cu：Less than 1.0%, Ni：Less than 1.0%, Cr：Less than 1.2%, Mo：
Less than 1.0%, W：It is more than one or both of less than 1.5%, and/or, selected from Ti：Less than 0.04%, Nb：0.20% with
Under, V：It is more than one or both of less than 0.20%, and/or, B：0.0005~0.0050%.
Selected from Cu：Less than 1.0%, Ni：Less than 1.0%, Cr：Less than 1.2%, Mo：Less than 1.0%, W：In less than 1.5%
One or more
Cu, Ni, Cr, Mo, W contribute to intensity increase and quenching degree improves the element of (hardenability).Turn into
The steel plate of former material steel plate can contain more than one or both of Cu, Ni, Cr, Mo and W as needed.
Cu be occur solid solution and contribute to intensity increase and quenching degree improve but also toughness (toughness) can be made, it is resistance to
Delayed fracture (delayed fracture resistance) and resistance to corrosion fatigue characteristic (corrosion fatigue
Resistance) the element improved.In order to obtain such effect, Cu contents are preferably set as more than 0.05%.The opposing party
Face, when Cu contents are more than 1.0%, the effect above saturation, it is impossible to expect the effect being consistent with content, it is unfavorable economically to become,
And processability is reduced.Therefore, in the case of containing Cu, Cu is preferably limited to less than 1.0%.In addition, more preferably 0.05
~0.25%.
Ni is that occur solid solution and contribute to intensity increase and quenching degree to improve, also contribute to toughness, delayed fracture resistance
The element of the raising of property and resistance to corrosion fatigue characteristic.In order to obtain such effect, preferably by Ni contents be set as 0.05% with
On.When Ni contents are more than 1.0%, the effect above saturation, it is impossible to obtain the effect being consistent with content, it is unfavorable economically to become,
And processability is reduced.Therefore, in the case of containing Ni, Ni contents are preferably limited to less than 1.0%.In addition, more preferably
0.05~0.25%.
Cr occurs solid solution and contributes to intensity increase and quenching degree to improve, and further generates fine carbide and lead to
Crossing precipitation strength (precipitation strengthening) contributes to intensity to increase.In order to obtain such effect, preferably
Cr contents are set as more than 0.1%.On the other hand, when Cr contents are more than 1.2%, effect saturation, it is impossible to expect and content phase
The effect of symbol, it is unfavorable economically to become, and easily produces field trash (inclusion) in electric resistance welding, to electric resistance welding portion
Integrity bring harmful effect.Therefore, in the case of containing Cr, Cr contents are preferably limited to less than 1.2%.In addition, more
Preferably 0.1~0.5%.
Mo occurs solid solution and contributes to intensity increase and quenching degree to improve, and further generates fine carbide and lead to
Crossing precipitation strength contributes to intensity to increase.In order to obtain such effect, more than 0.01% Mo contents are preferably comprised.The opposing party
Face, when Mo contents are more than 1.0%, effect saturation, it is impossible to expect the effect being consistent with content, it is unfavorable economically to become, and
Sometimes thick carbide, toughness reduction are formed.Therefore, in the case of containing Mo, preferably by Mo contents be defined to 1.0% with
Under.In addition, more preferably 0.10~0.30%.
W occur solid solution and contribute to intensity increase and quenching degree improve, and further have make the hardness after heat treatment
The good effect with the balance (balance) of toughness.In order to ensure such effect, preferably by W content be set as 0.01% with
On.On the other hand, when W content is more than 1.5%, effect saturation, it is impossible to expect the effect being consistent with content, economically become not
Profit.Therefore, in the case of containing W, W is preferably limited to less than 1.5%.In addition, more preferably 0.10~0.30%.
Selected from Ti：Less than 0.04%, Nb：Less than 0.20%, V：More than one or both of less than 0.20%
Ti, Nb, V are to form fine carbide and contribute to the increased element of intensity, can select to contain as needed
There are one or more.
Ti is that also have to ensure N fixations by being combined with N for improving quenching degree on the basis of above-mentioned effect
The element of effective solid solution B effect.Form fine nitride to suppress during heat treatment or during electric resistance welding in addition, Ti has
The effect of the coarsening of crystal grain, contributes to the raising of toughness.In order to obtain such effect, preferably Ti contents are set as
More than 0.001%.On the other hand, when Ti contents are more than 0.04%, field trash increase sometimes, toughness reduction.Therefore, Ti is being contained
In the case of, Ti contents are preferably limited to less than 0.04%.In addition, in the case of containing Ti, preferably with the pass with N content
The mode that following formula is met in system contains.In addition, more preferably 0.01~0.03%.
N/14≤Ti/47.9
(here, N, Ti are the content (quality %) of each element)
Nb has following effect：Fine carbide is formed in tempering and contributes to intensity to increase, and will heat treatment
Rear tissue miniaturization and improve toughness, delayed fracture resistance.In order to obtain such effect, preferably Nb contents are set as
More than 0.001%.On the other hand, when Nb contents are more than 0.20%, the effect above saturation, it is impossible to expect the effect being consistent with content
Really, economically become unfavorable.Therefore, in the case of containing Nb, Nb is preferably limited to less than 0.20%.In addition, more preferably
For 0.01~0.02%.
V forms fine carbide in tempering and contributes to intensity to increase.In order to ensure such effect, preferably by V
Content is set as more than 0.001%.On the other hand, when V content is more than 0.20%, the effect above saturation, it is impossible to expect and content
The effect being consistent, it is unfavorable economically to become.Therefore, in the case of containing V, V content is preferably limited to less than 0.20%.Separately
Outside, more preferably 0.01~0.08%.
B：0.0005~0.0050%
B is with micro containing causing quenching degree to improve so that the balance of hardness and toughness after heat treatment is good.In addition, B will
Crystal boundary (grain boundary) is strengthened and improves quenching crack resistance (quenching crack resistance).B can root
Contain according to needs.In order to obtain such effect, B content is set as more than 0.0005%.On the other hand, B content exceedes
When 0.0050%, the effect above saturation, it is impossible to expect the effect being consistent with content, it is unfavorable economically to become, and also generation is thick
Big precipitate containing B, toughness reduction.Therefore, in the case of containing B, B content is preferably limited to 0.0005~0.0050%
Scope.In addition, more preferably 0.002~0.003%.
Surplus beyond mentioned component is made up of Fe and inevitable impurity.It should be noted that as inevitable
Impurity, P：Less than 0.020%, S：Less than 0.010%, O：0.005% the following is can allow.
P：Less than 0.020%
P is that (weld crack resistance) and malleable band anti-thread breakage to proper alignment carry out dysgenic element.P contains
Measure reduces as far as possible in the scope preferably below 0.020%.But, the excessive reduction of P content makes refining cost (refining
Cost) surging, therefore, P content is preferably set to more than 0.0005%.In addition, more preferably less than 0.010%.
S：Less than 0.010%
S exists in steel in the form of sulfide-based field trash, is to processability, toughness and fatigue life (fatigue
Life the element for) bringing harmful effect and increasing reheat cracking susceptibility (reheat cracking sensitivity).
S contents are reduced as far as possible in the scope preferably below 0.010%.But, excessive reduction makes refining cost surging, therefore, S
Content is preferably set to more than 0.0005%.In addition, more preferably less than 0.001%.
O：Less than 0.005%
O (oxygen) exists in steel in the form of oxide system field trash (oxide inclusion), to processability, toughness
Harmful effect is brought with fatigue life.Therefore, reduced as far as possible in scope of O (oxygen) content preferably below 0.005%.Separately
Outside, more preferably less than 0.002%.
In the present invention, it regard the high carbon steel sheet of above-mentioned composition as former material steel plate.The manufacture method of former material steel plate is without special
Do not limit.The manufacture method of common hot rolled steel plate can be applied.Former material steel plate rip cutting is machined to defined width, with cold
Processing mode, preferably uses multiple forming rolls (forming rolls) and is continuously configured to after substantially cylindrical shape, will be relative
End face carries out butt resistance welding each other, so that electric-resistance-welded steel pipe is made.
In the present invention, after electric-resistance-welded steel pipe is made in progress electric resistance welding, in order to prevent shape defect (defect of
Shape), cold drawn deep rolling is implemented to the electric-resistance-welded steel pipe.In the rolling, precision mill is preferably used.In the present invention, will be cold
The drawing coefficient of drawing rolling is defined to less than 0.8%.When drawing coefficient is more than 0.8%, is cracked in electric resistance welding portion and wait scarce
Fall into, the reliability reduction in electric resistance welding portion.Therefore, the drawing coefficient by the cold drawn deep rolling implemented after electric resistance welding is defined to
Less than 0.8%.Additionally, it is preferred that being 0.01~0.1%.Defect for electric resistance welding portion is produced, preferably without cold drawn deep rolling
(drawing coefficient 0%).In the case of without cold drawn deep rolling, tube shape produces bad probability and increased.Need explanation
It is that the definition of drawing coefficient is girth × 100 (%) before (girth after girth-sizing before sizing)/sizing.
To implement drawing coefficient reheated immediately for the electric-resistance-welded steel pipe after less than 0.8% cold drawn deep rolling or
Person is cooled to after room temperature and reheated.The temperature of reheating is not particularly limited.In the present invention, the temperature of reheating is preferred
Can be carried out within the temperature range of being set as more than 850 DEG C assign more than 10% diameter reducing rate pyrocondensation footpath rolling temperature,
I.e. 900~1050 DEG C.
In the present invention, in the rolling of pyrocondensation footpath, austenite region (austenite region) is again heated to, resistance is realized
The high toughening in weldering portion, and the defect produced in electric resistance welding portion is squeezed broken and realizes innoxious, it is to improve electric resistance welding portion
Reliability and carry out.The finishing temperature (finishing rolling temperature) of pyrocondensation footpath rolling is less than 850 DEG C
When, the crimping (compression bonding) of shrinkage cavity shape defect becomes insufficient, it is impossible to reach the harmless of desired defect
Change.It should be noted that the finishing temperature of pyrocondensation footpath rolling is preferably more than 900 DEG C.In addition, the finishing temperature of pyrocondensation footpath rolling
The upper limit be that can prevent 1000 DEG C of coarsening of tissue.
In addition, pyrocondensation footpath rolling diameter reducing rate more than 850 DEG C within the temperature range of be less than 10% when, diameter reducing rate deficiency,
The innoxious of desired defect can not be reached.Therefore, diameter reducing rate pyrocondensation footpath rolled is defined to more than 10%.In addition, excellent
Elect more than 30% as.The upper limit of the diameter reducing rate of pyrocondensation footpath rolling is determined according to desired size shape.It should be noted that contracting
The definition of footpath rate is external diameter × 100 (%) before (external diameter after external diameter-rolling before rolling)/rolling.
Embodiment
By the hot rolled steel plate (thickness of slab of the high-carbon steel constituted table 1 Suo Shi：7.8mm) as former material steel plate.By these former material steel
Plate rip cutting processing (slitting), with cold working mode, substantially cylindrical shape is configured to using multiple rollers to defined width
Open pipe.Then, relative end face is abutted each other and carries out electric resistance welding, external diameter 89.1mm φ × wall thickness 7.9mm resistance is made
Coiling Welded Pipe (main pipe).It should be noted that for electric-resistance-welded steel pipe, being implemented after electric resistance welding using precision mill shown in table 2
The cold drawn deep rolling of drawing coefficient, is adjusted in the way of size shape as defined in being formed.After cold drawn deep rolling, utilize immediately
Sensing heating means are heated to the temperature shown in table 2, implement pyrocondensation footpath under the conditions shown in Table 2 using hot reducer and roll
System, carries out air cooling, so that external diameter 42.7mm φ × wall thickness 8.0mm electric-resistance-welded steel pipe is made after the rolling of pyrocondensation footpath.
Electric resistance welding portion total length (about 10000m) for resulting electric-resistance-welded steel pipe carries out ultrasonic examination, to being detected
The presence or absence of defect and defect number (being converted into every 10000m length) investigated.Ultrasonic examination is with depth 0.2mm × length
On the basis of the breach for spending 12.5mm, carried out with 6dB sensitivity amplification.
In addition, cutting test material from resulting electric-resistance-welded steel pipe, cold-drawn processing is carried out until external diameter 36.7mm φ
× wall thickness 7.2mm, then, (water cooling is quenched after 950 DEG C of heating for implementation normalized treatment (air cooling after 945 DEG C of heating) and Quenching Treatment
Fire), cut torsional fatigue test piece (length：500mm), torsional fatigue test is implemented.
In torsional fatigue test, for 10 test films, the distorting stress τ for implementing to make outer surface is 350MPa and repeat number
Experiment untill 2,000,000 times, determines the generation ratio (%) of resistance crack of weld.According to these result (ultrasonic examinations
With the result of torsional fatigue test), the reliability to electric resistance welding portion is evaluated.It is 0 by the defect number in ultrasonic examination
The situation that flawless is produced in individual and torsional fatigue test is denoted as "○", situation in addition is denoted as into "×", to reliability
Evaluated.
Resulting result is shown in Table 3.
Example of the present invention is the defect generation in electric resistance welding portion less and the crackle in electric resistance welding portion is produced in torsional fatigue test
It is raw also few.On the other hand, in the comparative example for deviateing the scope of the present invention, the defect generation number in electric resistance welding portion is more, tired reversing
The crackle in electric resistance welding portion produces also many in labor experiment.
[table 2]
*) the cold drawn deep rolling carried out after electric resistance welding using precision mill
*) diameter reducing rate in more than 850 DEG C of temperature gardenful
[table 3]
*) electric resistance welding portion
*) (the test strip number cracked/overall test slip number) × 100 (%)
Claims (11)
1. by former material steel formability it is substantially cylindrical shape by cold working a kind of manufacture method of the electric-resistance-welded steel pipe of high-carbon steel
Afterwards, relative end face is subjected to butt resistance welding each other and electric-resistance-welded steel pipe is made, the manufacture method of the electric-resistance-welded steel pipe
It is characterised by,
The former material steel plate is set as to contain C in terms of quality %：0.30~0.60%, Si：0.05~0.50%, Mn：0.30
~2.0%, Al：Less than 0.50%, N：Less than 0.0100% and the height constituted that is made up of Fe and inevitable impurity of surplus
Carbon steel sheet,
After the electric resistance welding, it is more than 0.01% and less than 0.8% cold drawn deep rolling to implement drawing coefficient, then, immediately
Reheated or reheated after being cooled down, more than 850 DEG C within the temperature range of implement diameter reducing rate be more than 10%
Pyrocondensation footpath is rolled.
2. the manufacture method of the electric-resistance-welded steel pipe of high-carbon steel as claimed in claim 1, it is characterised in that in the base of the composition
On plinth, further contained in terms of quality % and be selected from Cu：Less than 1.0%, Ni：Less than 1.0%, Cr：Less than 1.2%, Mo：1.0%
Below, W：More than one or both of less than 1.5%.
3. the manufacture method of the electric-resistance-welded steel pipe of high-carbon steel as claimed in claim 1 or 2, it is characterised in that in the composition
On the basis of, further contained in terms of quality % and be selected from Ti：Less than 0.04%, Nb：Less than 0.2%, V：One in less than 0.2%
Plant or two or more.
4. the manufacture method of the electric-resistance-welded steel pipe of high-carbon steel as claimed in claim 1 or 2, it is characterised in that in the composition
On the basis of, further contain B in terms of quality %：0.0005~0.0050%.
5. the manufacture method of the electric-resistance-welded steel pipe of high-carbon steel as claimed in claim 3, it is characterised in that in the base of the composition
On plinth, further contain B in terms of quality %：0.0005~0.0050%.
6. the manufacture method of the electric-resistance-welded steel pipe of high-carbon steel as claimed in claim 1 or 2, it is characterised in that the reheating
For the heating carried out using high-frequency induction heating means.
7. the manufacture method of the electric-resistance-welded steel pipe of high-carbon steel as claimed in claim 3, it is characterised in that the reheating is profit
The heating carried out with high-frequency induction heating means.
8. the manufacture method of the electric-resistance-welded steel pipe of high-carbon steel as claimed in claim 4, it is characterised in that the reheating is profit
The heating carried out with high-frequency induction heating means.
9. the manufacture method of the electric-resistance-welded steel pipe of high-carbon steel as claimed in claim 5, it is characterised in that the reheating is profit
The heating carried out with high-frequency induction heating means.
10. a kind of automobile component, it is characterised in that to use the electric resistance welding of high-carbon steel according to any one of claims 1 to 9
The electric-resistance-welded steel pipe of the high-carbon steel of the manufacture method manufacture of steel pipe is manufactured and obtained as former material.
11. automobile component as claimed in claim 10, wherein, the automobile component is front fork, rack, drive shaft, steering horizontal stroke
Any one in pull bar, stator axis, camshaft.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-197819 | 2013-09-25 | ||
| JP2013197819A JP5867474B2 (en) | 2013-09-25 | 2013-09-25 | Manufacturing method of high carbon ERW welded steel pipe with excellent reliability of ERW welds |
| PCT/JP2014/004882 WO2015045373A1 (en) | 2013-09-25 | 2014-09-24 | Process for manufacturing high-carbon electric resistance welded steel pipe, and automobile part |
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| Publication Number | Publication Date |
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| CN105555976A CN105555976A (en) | 2016-05-04 |
| CN105555976B true CN105555976B (en) | 2017-10-10 |
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| CN201480051527.5A Active CN105555976B (en) | 2013-09-25 | 2014-09-24 | The manufacture method and automobile component of high-carbon electric-resistance-welded steel pipe |
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| Country | Link |
|---|---|
| EP (1) | EP3018220B1 (en) |
| JP (1) | JP5867474B2 (en) |
| KR (1) | KR101766293B1 (en) |
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| KR101676244B1 (en) | 2015-04-14 | 2016-11-29 | 현대자동차주식회사 | Carbon steel compositions reduced thermal strain for steering rack bar and method for manufacturing the same |
| CN112368410B (en) * | 2018-06-27 | 2022-05-10 | 杰富意钢铁株式会社 | Electric resistance welded steel pipe for manufacturing hollow stabilizer, and manufacturing method thereof |
| CN109252096A (en) * | 2018-10-10 | 2019-01-22 | 江阴兴澄特种钢铁有限公司 | Economical heavy load truck steering gear rack 43MnCrMoB steel and its production method |
| CN113528939A (en) * | 2021-06-10 | 2021-10-22 | 江苏利淮钢铁有限公司 | Steel for tie rod joint in high-performance automobile steering system |
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| JP5867474B2 (en) | 2016-02-24 |
| KR20160055193A (en) | 2016-05-17 |
| EP3018220B1 (en) | 2018-08-29 |
| EP3018220A4 (en) | 2016-09-14 |
| EP3018220A1 (en) | 2016-05-11 |
| JP2015062920A (en) | 2015-04-09 |
| WO2015045373A1 (en) | 2015-04-02 |
| CN105555976A (en) | 2016-05-04 |
| KR101766293B1 (en) | 2017-08-08 |
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