CN108220796A - A kind of sports equipment connecting shaft wire rod and preparation method thereof - Google Patents
A kind of sports equipment connecting shaft wire rod and preparation method thereof Download PDFInfo
- Publication number
- CN108220796A CN108220796A CN201711464845.6A CN201711464845A CN108220796A CN 108220796 A CN108220796 A CN 108220796A CN 201711464845 A CN201711464845 A CN 201711464845A CN 108220796 A CN108220796 A CN 108220796A
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- China
- Prior art keywords
- wire rod
- connecting shaft
- sports equipment
- equipment connecting
- preparation
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/02—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
-
- 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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
Abstract
The present invention relates to metallurgical technology fields, specifically disclose a kind of sports equipment connecting shaft wire rod and preparation method thereof.The preparation method, includes the following steps：Aluminum killed steel is subjected to multiple tracks drawing process, makes total draught >=60%, obtains just bracing wire material；First bracing wire material is subjected to spheroidizing processing, after being warming up to 735 745 DEG C of 4 5h of heat preservation, 685 690 DEG C of 3 4h of heat preservation is cooled to, continues to be cooled to 450 500 DEG C and come out of the stove, the wire rod made annealing treatment；The wire rod of annealing is subjected to the precision drawing process that compression ratio is 5 10%, obtains sports equipment connecting shaft wire rod.The preparation method of sports equipment connecting shaft wire rod provided by the invention, it is simple for process, it is easy to operate, the high Oxygen potential fastener wire made, organize crystal grain tiny, uniform, Oxygen potential is high, and pearlite is evenly distributed, tissue without exception, plastic deformation ability is strong, and performance is stablized, and has preferable anti-fatigue performance, it prevents from being broken in motion process, longer service life.
Description
Technical field
The present invention relates to metallurgical technology fields more particularly to a kind of sports equipment connecting shaft wire rod and preparation method thereof.
Background technology
The economy of high speed development allows people’s lives level to become better and better, but excessively high live and work pressure, Yi Ji
Beneficial severe environmental problem, continues to decline the health status of people.There is correlative study to show the whole world now only less than 10%
People be in health status, and have more than 70% people and be in sub-health state, at any time possibly into patients with chronic diseases row
Row.With slowing down for economic speedup, people constantly strengthen the concern of importance of health, and idea is also pre- to body-building from treatment of taking medicine
Anti- constantly transformation.Nationwide fitness programs flourish, and various sports equipments also come into being.
The connecting shaft that sports equipment uses is mainly there are two acting on, first, fastening effect is connected, second is that support load effect.
The characteristic of connecting shaft causes ceaselessly to be acted on by fluctuating load and strain during its use, uses for a long time, damage product
It is tired to cause fracture afterwards to a certain extent, lead to equipment failure.The connecting shaft used on the market now is main or by automatic lathe
Production, cost is higher, and waste of raw materials is serious, and production efficiency is low, and service life is short.Part is assembled using male and female nail form,
It is not easily molded in cold-heading also because the reason of raw material although production efficiency can improve, a large amount of defective products are generated, are caused
Waste.
The connection shaft material of common turnery processing has Q235, No. 20 steel, No. 35 steel, No. 45 steel, 40Cr etc., these materials tool
There is preferable turning ability, can generally meet the related request of general connecting shaft, but lack good cold-heading molding performance.With
The improvement of people's living standards, the continuous protrusion of social resources scarcity problem, under energy-saving overall situation, the cost of people
The constantly enhancing of consciousness and efficiently consciousness, the processing method of connecting shaft also towards low cost, high efficiency, high service life direction
It continues to develop.Irregular however, as each manufacturer's annealing process, technique is unreasonable, leads to the uniformity of material composition
It is bad, still have it is suddenly soft neglect the phenomenon that hard, often poor dimensional stability or even difficult forming in forging process cause mold
Initial failure, so as to improve the cost of forging, in addition end properties are unstable, cause connecting shaft service life low.Male and female
Nail form connects, and assembling is simple, is produced using cold-heading molding processing technology, and production efficiency is high, and waste of raw materials is relatively low, after being
The Main Trends of The Development of continuous sports equipment connecting shaft production.This machine-shaping ability and subsequent processing to raw material, mechanical property
It can be a stern challenge.There are a steel exclusively for cold forging industrial development in external steel and iron manufacturing enterprise, such as Japan
SWRCH8A, SWRCH18A, SWRCH22A, these steel are respectively provided with preferable cold heading quality and heat treatment performance, resistance of deformation
It is small, metallographic structure is uniform, surface quality is good.
Invention content
For existing connecting shaft with the uniformity of fastener wire ingredient bad, poor dimensional stability, fatigue resistance is not
The problems such as height, service life is short, the present invention provide a kind of sports equipment connecting shaft wire rod and preparation method thereof.
To achieve the above object of the invention, the embodiment of the present invention employs following technical solution：
A kind of preparation method of sports equipment connecting shaft wire rod, includes the following steps：
(1) aluminum killed steel is subjected to multiple tracks drawing process, makes total draught >=60%, obtain just bracing wire material；
(2) the just bracing wire material is subjected to spheroidizing processing, after being warming up to 735-745 DEG C of heat preservation 4-5h, be cooled to
685-690 DEG C of heat preservation 3-4h, continues to be cooled to 450-500 DEG C and come out of the stove, the wire rod made annealing treatment；
(3) wire rod of annealing is subjected to the precision drawing process that compression ratio is 5-10%, obtains sports equipment connection
Axis wire rod.
Relative to the prior art, the preparation method of sports equipment connecting shaft wire rod provided by the invention is simple for process, behaviour
Facilitate, using aluminum killed steel as raw material, the stress value of material is improved by preliminary drawing process, is provided for follow-up spheroidizing
More driving forces；The carbide spheroidization made in the microstructure of steel material is handled by spheroidizing, reduces the hard of material
Degree improves the plasticity of material, reduces the resistance of deformation of material, and material is made to be easy to plastic processing forming；It is obtained again through drawing process
Shape, size, machinery and physical property meet the requirement of fastener.
Further, the present invention also provides the sports equipment connecting shaft wire rod, the sports equipment connecting shaft wire rods
It is prepared by the preparation method.
Relative to the prior art, sports equipment connecting shaft wire rod provided by the invention, tissue crystal grain is tiny, uniform, ball
Rate is high, and pearlite is evenly distributed, and tissue without exception, plastic deformation ability is strong, meets subsequent cold-heading molding requirement, and performance is steady
It is fixed, meet size tolerance requirements, there is preferable anti-fatigue performance, prevent from being broken in motion process, longer uses the longevity
Life.
Description of the drawings
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to needed in the embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is the metallograph of sports equipment connecting shaft wire rod aluminum killed steel in the embodiment of the present invention；
Fig. 2 is the metallograph of sports equipment connecting shaft wire rod in the embodiment of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
The embodiment of the present invention provides a kind of preparation method of sports equipment connecting shaft wire rod.The preparation method,
Include the following steps：
(1) aluminum killed steel is subjected to multiple tracks drawing process, makes total draught >=60%, obtain just bracing wire material；
(2) the just bracing wire material is subjected to spheroidizing processing, after being warming up to 735-745 DEG C of heat preservation 4-5h, be cooled to
685-690 DEG C of heat preservation 3-4h, continues to be cooled to 450-500 DEG C and come out of the stove, the wire rod made annealing treatment；
(3) wire rod of annealing is subjected to the precision drawing process that compression ratio is 5-10%, obtains sports equipment connection
Axis wire rod.
Specifically, aluminum killed steel medium pearlite quantity is few, the corresponding very little of the carburizing scale of construction, and in lamellar.
Specifically, in above-mentioned steps (1), drawing process makes total draught >=60%, and compression ratio is big, the change that steel generate
Shape amount is bigger, and the inside ferrites of steel and pearlitic structrure are by the threadiness that is elongated to of machinery, cementite in pearlite
Position is to wire-drawing shaft is parallel to, and be in broken shape, and interior tissue is broken by the drawing-down of machinery, drawing, and interior tissue dislocation increases, and makes steel
With higher dislocation energy, energy is provided for subsequent heat treatment, preferably obtains the metallographic structure of unifonn spherical；Aluminum killed steel
Lamella cementite in pearlite crushes, these cementite fragments in subsequent spheroidising as the core of nodularization, simultaneously
Steel internal storage put aside in plastic deformation can could carry out nodularization as the driving force of nodularization by way of process annealing
Processing.
In above-mentioned steps (2), spheroidizing processing improves structure of steel and performance, makes the carbon in the microstructure of steel material
Compound nodularization reduces the hardness of material, improves the plasticity of material, reduces the resistance of deformation of material, material is made to be easy to plastic processing
Forming；If holding temperature is excessively high, cementite will be uniformly dissolved in austenite, so as to form single uniform austenite group
It knits, according to nodularization theory, uniform austenite is difficult to be transformed into spheroidite tissue, similarly, when holding temperature is relatively low, is oozed
Carbon body is not by fully molten disconnected, it is also difficult to obtain spherodized structure, therefore, the temperature of spheroidizing processing is controlled respectively in austenite
20-30 DEG C of transition temperature more than 25-30 DEG C below austenite transformation temperature, is kept the temperature, obtains the height of nodulizing grade >=5 grade
Oxygen potential fastener wire.
In above-mentioned steps (3), precision drawing process is to carry out drawing process using smaller compression ratio, makes wire rod deformation,
So as to obtain the shape of needs, size, machinery and physical property, the compression ratio of control accuracy drawing is 5-10%, is made processed
The defects of wire surface work-hardening capacity is greatly lowered in journey, reduction product surface micro-crack, point, enhances product performance
Stability.
Wherein, total draught is the cross section total draught that finished product steel wire (wire rod) is drawn to by steel wire rod.
Preferably, the aluminum killed steel is counted using the total weight of the aluminum killed steel as 100%, including following weight percent
The following elements component of ratio：0.18%≤C≤0.23%, Si≤0.10%, 0.70%≤Mn≤1.00%, P≤0.030%, S
≤ 0.035%, AL >=0.02%, the mechanical property of wire rod are mainly related and above-mentioned with its chemical composition composition and microscopic structure
Steel have preferable cold heading quality and heat treatment performance, and resistance of deformation is small, metallographic structure is uniform, surface quality is good, after being
Continuous heat treatment process provides safeguard.
Preferably, aluminum killed steel non-metallic inclusion≤0.5 grade；S, P content≤0.025%；And without chemical segregation phenomena,
Core structure is evenly distributed, no ferrite and pearlite and Widmannstatten structure, to ensure the quality requirements of final products.
Preferably, a diameter of 8.0mm of the aluminum killed steel contributes to subsequent drawing and annealing to handle, makes final products
Quality meet the needs of connecting shaft fastener.
Preferably, the austenite transformation temperature of the aluminum killed steel is 715 DEG C, contributes to temperature in spheroidizing processing
Control, if holding temperature is excessively high, cementite will be uniformly dissolved in austenite, so as to form single uniform austenite group
It knits, according to nodularization theory, uniform austenite is difficult to be transformed into spheroidite tissue, similarly, when holding temperature is relatively low, is oozed
Carbon body is not by fully molten disconnected, it is also difficult to obtain spherodized structure.
Preferably, in step (1), (3), the drawing speed of the drawing process is 8-10m/min, and wire rod is made to reach corresponding
Compression ratio.
Preferably, in the spheroidizing processing, heating rate is 80-100 DEG C/h, and cooling rate is 10-30 DEG C/h, is delayed
Slowly reach holding temperature, convenient for control, the ingredient for making wire rod is uniform.
Preferably, the spheroidizing processing carries out in methanol atmosphere, and methanol stream amount is passed through nodularization for 2L/min and moves back
Stove, the gas that the methanol gas is generated for methanol by cracking, methanol concentration is >=99%, to ensure wire rod not by decarburization.
Preferably, the sports equipment connecting shaft is 4.5mm with gauge or diameter of wire, mean grain size >=11 grade, nodulizing grade
>=5 grades, tensile strength 470-500MPa, the size for final products meets wanting for the high Oxygen potential fastener wire of connecting shaft
It asks.
The preparation method of sports equipment connecting shaft wire rod provided in an embodiment of the present invention, it is simple for process, it is easy to operate, with
Aluminum killed steel is raw material, and the stress value of material is improved by preliminary drawing process, more drives are provided for follow-up spheroidizing
Power；The carbide spheroidization made in the microstructure of steel material is handled by spheroidizing, reduces the hardness of material, improves material
The plasticity of material reduces the resistance of deformation of material, and material is made to be easy to plastic processing forming；Again through drawing process obtain shape, size,
Machinery and physical property meet the requirement of fastener,
The present invention still further provides this under the premise of the preparation method for providing the sports equipment connecting shaft wire rod
Sports equipment connecting shaft wire rod.
Sports equipment connecting shaft wire rod provided in an embodiment of the present invention, tissue crystal grain is tiny, uniform, and Oxygen potential is high, pearl
Body of light is evenly distributed, and tissue without exception, plastic deformation ability is strong, meets subsequent cold-heading molding requirement, and performance is stablized, and meets ruler
Very little tolerance has preferable anti-fatigue performance and longer service life.
In order to better illustrate the preparation method of sports equipment connecting shaft wire rod provided in an embodiment of the present invention, lead to below
Cross that embodiment is further to be illustrated.
Embodiment 1
The preparation method of sports equipment connecting shaft wire rod, includes the following steps：
(1) the aluminum killed steel SWRCH22A that specification is 8.0mm is carried out at 5 drawings as needed
Reason, total draught >=60% obtain just bracing wire material；
(2) the just bracing wire material is subjected to spheroidizing processing, after being warming up to 735 DEG C of heat preservation 4.5h with 100 DEG C/h, with 30
DEG C/h is cooled to 690 DEG C of heat preservation 3.5h, and then it is cooled to 500 DEG C and comes out of the stove, the wire rod made annealing treatment；
(3) precision drawing compression ratio is made to be obtained for 5-10% into single track precision drawing process in the wire rod of the annealing
To the sports equipment connecting shaft wire rod that specification is 4.5mm.
Embodiment 2
The preparation method of sports equipment connecting shaft wire rod, includes the following steps：
(1) the aluminum killed steel SWRCH22A that specification is 8.0mm is carried out at 6 drawings as needed
Reason, total draught >=60% obtain just bracing wire material；
(2) the just bracing wire material is subjected to spheroidizing processing, after being warming up to 745 DEG C of heat preservation 5h with 80 DEG C/h, with 10 DEG C/
H is cooled to 685 DEG C of heat preservation 4h, then is cooled to 450 DEG C and comes out of the stove, the wire rod made annealing treatment；
(3) precision drawing compression ratio is made to be obtained for 5-10% into single track precision drawing process in the wire rod of the annealing
To the sports equipment connecting shaft wire rod that specification is 4.5mm.
Embodiment 3
The preparation method of sports equipment connecting shaft wire rod, includes the following steps：
(1) the aluminum killed steel SWRCH22A that specification is 8.0mm is carried out at 7 drawings as needed
Reason, total draught >=60% obtain just bracing wire material；
(2) the just bracing wire material is subjected to spheroidizing processing, after being warming up to 740 DEG C of heat preservation 4h with 90 DEG C/h, with 20 DEG C/
H is cooled to 685 DEG C of heat preservation 3h, then is cooled to 500 DEG C and comes out of the stove, the wire rod made annealing treatment；
(3) precision drawing compression ratio is made to be obtained for 5-10% into single track precision drawing process in the wire rod of the annealing
To the sports equipment connecting shaft wire rod that specification is 4.5mm.
In order to better illustrate the preparation of the preparation method of sports equipment connecting shaft wire rod provided in an embodiment of the present invention
The characteristic of high Oxygen potential fastener wire, the high Oxygen potential fastener wire for below preparing embodiment 1,2,3 carry out corresponding
Performance test, the results are shown in Table 1.
Table 1
| Title | Technical parameter | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Nodulizing grade | >=5 grades | 5 grades | 6 grades | 5 grades |
| Grain size | >=11 grades | 11 grades | 12 grades | 11 grades |
| Tensile strength | 470-500MPa | 475MPa | 490MPa | 495MPa |
The interior tissue performance of the aluminum killed steel and sports equipment connecting shaft wire rod in embodiment 1 is detected simultaneously, specifically
Testing result difference is as depicted in figs. 1 and 2.
It can be obtained by data above, obtained sports equipment connecting shaft wire rod in the embodiment of the present invention, tissue crystal grain is thin
Small, uniform, Oxygen potential is high, and pearlite is evenly distributed, and tissue without exception meets connecting shaft and required with fastener wire.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modification, equivalent replacement or improvement made within refreshing and principle etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of preparation method of sports equipment connecting shaft wire rod, it is characterised in that：Include the following steps：
(1) aluminum killed steel is subjected to multiple tracks drawing process, makes total draught >=60%, obtain just bracing wire material；
(2) the just bracing wire material is subjected to spheroidizing processing, after being warming up to 735-745 DEG C of heat preservation 4-5h, is cooled to 685-690
DEG C heat preservation 3-4h, continues to be cooled to 450-500 DEG C and come out of the stove, the wire rod made annealing treatment；
(3) wire rod of annealing is subjected to the precision drawing process that compression ratio is 5-10%, obtains sports equipment connecting shaft use
Wire rod.
2. the preparation method of sports equipment connecting shaft wire rod as described in claim 1, it is characterised in that：The al-killed
Steel is counted using the total weight of the aluminum killed steel as 100%, the following elements component including following weight percent：0.18%≤C
≤ 0.23%, Si≤0.10%, 0.70%≤Mn≤1.00%, P≤0.030%, S≤0.035%, AL >=0.02%.
3. the preparation method of sports equipment connecting shaft wire rod as described in claim 1, it is characterised in that：The aluminum killed steel
A diameter of 8.0mm.
4. the preparation method of sports equipment connecting shaft wire rod as claimed in claim 2, it is characterised in that：The aluminum killed steel
Austenite transformation temperature be 715 DEG C.
5. the preparation method of sports equipment connecting shaft wire rod as described in claim 1, it is characterised in that：Step (1), (3)
In, the drawing speed of the drawing process is 8-10m/min.
6. the preparation method of sports equipment connecting shaft wire rod as described in claim 1, it is characterised in that：The spheroidizing
In processing, heating rate is 80-100 DEG C/h, and cooling rate is 10-30 DEG C/h.
7. the preparation method of sports equipment connecting shaft wire rod as described in claim 1, it is characterised in that：The spheroidizing
Processing carries out in methanol atmosphere.
8. such as the preparation method of claim 1-7 any one of them sports equipment connecting shaft wire rods, it is characterised in that：It is described
Sports equipment connecting shaft is 4.5mm with gauge or diameter of wire, mean grain size >=11 grade, nodulizing grade >=5 grade, tensile strength 470-
500MPa。
9. a kind of sports equipment connecting shaft wire rod, it is characterised in that：The sports equipment connecting shaft wire rod is by aforesaid right
It is required that any one of 1-8 the methods prepare.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711464845.6A CN108220796A (en) | 2017-12-28 | 2017-12-28 | A kind of sports equipment connecting shaft wire rod and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711464845.6A CN108220796A (en) | 2017-12-28 | 2017-12-28 | A kind of sports equipment connecting shaft wire rod and preparation method thereof |
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| Publication Number | Publication Date |
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| CN108220796A true CN108220796A (en) | 2018-06-29 |
Family
ID=62646610
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|---|---|---|---|
| CN201711464845.6A Pending CN108220796A (en) | 2017-12-28 | 2017-12-28 | A kind of sports equipment connecting shaft wire rod and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111378814A (en) * | 2018-12-29 | 2020-07-07 | 东莞科力线材技术有限公司 | Preparation method of axis wire of copier |
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| CN102747269A (en) * | 2012-05-22 | 2012-10-24 | 内蒙古包钢钢联股份有限公司 | Low-silicon aluminum-containing steel and production method thereof |
| CN104313281A (en) * | 2014-09-30 | 2015-01-28 | 东莞市科力钢铁线材有限公司 | Process for producing high-nodularity fastener wire rod |
| CN105666063A (en) * | 2016-03-28 | 2016-06-15 | 海盐光大标准件有限公司 | Processing process for fastening bolt of highway guardrail |
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2017
- 2017-12-28 CN CN201711464845.6A patent/CN108220796A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002153952A (en) * | 2000-11-21 | 2002-05-28 | Nkk Corp | METHOD FOR PRODUCING Al-KILLED STEEL CAST SLAB |
| CN102747269A (en) * | 2012-05-22 | 2012-10-24 | 内蒙古包钢钢联股份有限公司 | Low-silicon aluminum-containing steel and production method thereof |
| CN104313281A (en) * | 2014-09-30 | 2015-01-28 | 东莞市科力钢铁线材有限公司 | Process for producing high-nodularity fastener wire rod |
| CN105666063A (en) * | 2016-03-28 | 2016-06-15 | 海盐光大标准件有限公司 | Processing process for fastening bolt of highway guardrail |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111378814A (en) * | 2018-12-29 | 2020-07-07 | 东莞科力线材技术有限公司 | Preparation method of axis wire of copier |
| CN111378814B (en) * | 2018-12-29 | 2021-12-24 | 东莞科力线材技术有限公司 | Preparation method of axis wire of copier |
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Application publication date: 20180629 |