CN1389310A - Spring steel wire for direct drawing and its making process - Google Patents
Spring steel wire for direct drawing and its making process Download PDFInfo
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- CN1389310A CN1389310A CN 01114045 CN01114045A CN1389310A CN 1389310 A CN1389310 A CN 1389310A CN 01114045 CN01114045 CN 01114045 CN 01114045 A CN01114045 A CN 01114045A CN 1389310 A CN1389310 A CN 1389310A
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- spring steel
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- 60si2mna
- steel wire
- wire rod
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Abstract
The present invention relates to a silicone-manganese spring steel wire material for direct drawing and its production process. The chemical composition of the silicone-manganese spring steel wire material (55Si2Mn, 60Si2MnA and 60 Si2Mn) adopts the composition propertion defined by GB/T1222-1984 <<Spring Steel>>. By controlling rolling and cooling processes it can make hot-rolled silicone-manganese spring steel wire material obtain uniformly-distributed nodular troostite and small-quantity ferritic (or sorbitic) tissue, its tensile strength (sigma b) is 1000 MPa-1200 MPa, reduction of cross-sectional area (psi) is 25%-50%, and its plasticity can be fully raised, so that said hot-rolled wire material can be not be undergone the process of annealing treatment, and can be directly drawn.
Description
The invention belongs to steel alloy and manufacturing process field, relate to a kind of direct drawing with spring steel wire and manufacturing process.
Spring steel is widely used in automobile, railway and machinery etc., and is increasing to the demand of spring steel along with the develop rapidly of Domestic Automotive Industry, railway transportation, and domestic demand amount every year is more than 300,000 tons.
The spring steel hot rolling wire adopts traditional handicraft rolling, owing to be subjected to the restriction of milling train and technology, rolls back tensile strength (σ
b) 800MPa～1000MPa, the contraction percentage of area (ψ) 10%～20%, tissue is generally thick pearlite and ferrite.Above-mentioned hot rolling spring steel wire rod plasticity is relatively poor, not directly is used for drawn steel wire, must just can reach the needed processing performance requirement of cold working earlier through the annealing of 680 ℃～760 ℃ * 3h～5h before the drawing processing.Use the traditional processing technology of above-mentioned hot rolling wire drawn steel wire to be: gren rod → annealing → pickling → → wire drawing → intermediate annealing → pickling → wire drawing ... → warehouse-in, just blank at first must be through annealing before drawing.The hot candied production technology cost height of tradition, low, the contaminated environment of production efficiency.
Along with the application of high-speed wire mill in special steel is produced, adopt controlled rolling and control process for cooling to become possibility during spring steel wire is rolling.
Domestic wire rod controlled rolling and control cooling are new technologies that grows up along with the application of high-speed wire mill the eighties, are applied at first in mild steel, the low-alloy steel production, and main purpose is in order to improve intensity and comprehensive mechanical property.Alloy spring is middle carbon, high strength special steel, and tissue changes complexity in the operation of rolling, and the control difficulty is bigger.The domestic before this report of not seeing employing controlled rolling and the successful rolling spring steel wire rod of control cooling as yet.At present, Dalian Iron ﹠ Steel Group Corp. Ltd on its high accuracy alloy steel rod wire tandem rolling machine of being introduced by Germany, successfully develops spring steel wire controlled rolling and control novel technique for cooling.
The objective of the invention is to make the abundant refinement of hot rolling spring steel wire rod crystal grain by adopting controlled rolling and control process for cooling, roll the back and obtain shred shape, equally distributed pearlite and a little ferrite (or sorbite) tissue, wire rod rolls back tensile strength (σ
b) 1000MPa～1200MPa, the contraction percentage of area (ψ) 25%～48%.Plasticity fully improves, and can make hot rolling wire without the direct drawing of annealing.
The present invention adopts following technical scheme.
The composition proportion of GB/T1222-1984 " spring steel " regulation is adopted in direct drawing among the present invention with the chemical composition of silicon-manganese spring steel (55Si2Mn, 60Si2MnA and 60Si2Mn) wire rod.
Direct drawing among the present invention is carried out following technology with silicon-manganese spring steel (55Si2Mn, 60Si2MnA and 60Si2Mn) wire rod manufacturing:
Steel ingot (3t) → red commentaries on classics → breaking down evolution base (150mm) → steel billet slow cooling → steel billet shot-peening, flaw detection → steel billet machinery reconditioning → wire and rod continuous rolling machine are annotated in electric furnace (EBT) smelting → external refining (LF+VD) → mould rolling → hot rolling material finished product.
Wherein wire rod rolling operation adopts controlled rolling and control process for cooling, is the core of the technical program, divides three sections controls:
Roll 1 just, and be controlled at single-phase austenite perfect recrystallization zone, 980 ℃～1030 ℃ of start rolling temperatures;
2 finish to gauges are controlled at austenite non-recrystallization district or two-phase section, 800 ℃～900 ℃;
Rolling line water-cool control to 750 ℃ after 3 finish to gauges～850 ℃ is weaved silk; The Stelmer line traffic control moves fast 0.15m/s～0.25m/s, is cooled to below 400 ℃.
Specify as follows:
Controlled rolling is to carry out at the austenite phase region or at austenite and ferrite two-phase section, and air cooling or control cooling velocity obtain desirable microstructure and property then.Be dynamic recrystallization and static state crystallization and structure refinement again.
At the above crystal grain thinning of austenite recrystallization temperature, be to utilize thermal deformation and crystallization crystal grain thinning again: distortion more than 1000 ℃, mainly with the dynamic recrystallization crystal grain thinning; Distortion below 1000 ℃ is mainly with static state crystallization crystal grain thinning again.The crystal grain thinning main purpose is to be rolled repeatedly-crystallization crystal grain thinning again by the initial austenite crystal grain to the alligatoring of when heating, adds a little ferrite (or sorbite) tissue and lays the foundation thereby obtain fine pearlite during for γ after the finish to gauge-α phase transformation.
At the following deformed microstructure crystal grain thinning of austenite recrystallization temperature.It is rolling that finish to gauge is controlled at two-phase section (800 ℃～900 ℃), crystallization difficulty again below 850 ℃, austenite crystal produces deformation band along rolling direction, this moment is not only because the increase of grain boundary area has improved ferrite forming core density, and the ferrite nucleus appears on deformation band, further promote the ferrite crystal grain refinement.
Rolling line water-cool control after the finish to gauge makes the austenite that carries out phase transformation form fine pearlitic grain, thereby obtains evenly, fine pearlite adds a little ferrite (or sorbite) tissue, finally obtains excellent comprehensive performances.
Cooling controlling and rolling controlling process has outstanding advanced than pair rolling technology.With 60Si2Mn is example, and 60Si2Mn is a sub-eutectoid steel, Ac
3745 ℃, Ac
3808 ℃, Ar
1700 ℃, Ar
3At first separate out pro-eutectoid ferrite for 770 ℃ in rolling the back cooling procedure, pearlite changes subsequently, and ferritic free forms net, and thick sheet pearlite colony very easily appears in pearlite, crystal grain is thick, and steel hardness, fragility all obviously increase, degradation.Must carry out the appearance that cooling controlling and rolling controlling process just can be avoided this tissue.
Advantage of the present invention and effect:
Have following characteristics:
1) chemical composition of silicon-manganese spring steel (55Si2Mn, 60Si2MnA and 60Si2Mn) wire rod takes the composition proportion of GB/T1222 regulation not adjust, and by adopting controlled rolling and control novel technique for cooling its tissue, performance is greatly improved.
2) annealing operation in the minimizing Production for Steel Wire.
Have the following advantages:
The first, hot rolling wire is organized as evenly, fine pearlite adds a little ferrite (or sorbite); In the mechanical property, intensity, plasticity are improved, especially contraction percentage of area increase rate is bigger.
The second, hot rolling wire can directly carry out the drawing of 20%～50% deflection without annealing.
The 3rd, help environmental protection.Reduce the wire acid cleaning amount, reduce noxious gas emission.
The 4th, obvious economic mainly realizes in Production for Steel Wire.
1) reduces the Equipment for Heating Processing investment.The Equipment for Heating Processing investment accounts for spring steel wire production equipment gross investment 30%～50%, when adopting the present invention to produce, can reduce the Equipment for Heating Processing investment and reach 1/3, can reduce plant area 60～80m simultaneously
2
2) reduce production costs.But reduce heat treatment amount energy efficient 30%; Reduce the metal charge scaling loss, lumber recovery brings up to 98% by 94% of routine; Reduce pickling consumption.More than three totals, the 400 yuan/t～450 yuan/t that can reduce production costs.
3) help the continuous automatic production of spring steel wire, improve operating efficiency.The wire rod of deep bid weight, high-ductility, obdurability is for advantage has been created in the application of continuous drawing machine in spring steel wire production.
The embodiment of the invention: by controlled rolling of the present invention and control process for cooling rolled wire 60Si2MnA three stoves.
Embodiment 1:
Trade mark 60Si2MnA heat (batch) number 011/1982 specification 14.0mm
Its rolling mill practice:
980 ℃～1030 ℃ of start rolling temperatures advance 850 ℃～880 ℃ of the preceding temperature of finishing mill, 780 ℃～800 ℃ of laying temperatures;
Assay:
Tensile strength (σ
b) 1010MPa～1020Mpa, the contraction percentage of area (φ) 40%～43%.
Pull-out test:
The direct pickling of wire rod raw material, yellow, dry back draws on vertical wire drawing machine, and pulling process is as follows:
14.0-12.0-10.5(mm)。
Draw two passages, total draft 43.7% draws 720 ℃ ± 10 ℃ * 6～7h of after annealing, tensile strength (σ
b) 600MPa～700Mpa.
Embodiment 2:
Trade mark 60Si2MnA heat (batch) number 011/1154 specification 8.0mm
Its rolling mill practice:
980 ℃～1030 ℃ of start rolling temperatures advance 800 ℃～850 ℃ of the preceding temperature of finishing mill, 750 ℃～810 ℃ of laying temperatures;
Assay:
Tensile strength (σ
b) 1010MPa～1050Mpa, the contraction percentage of area (φ) 40%～42%.
Pull-out test:
The direct pickling of wire rod raw material, yellow, dry back draws on vertical wire drawing machine, and pulling process is as follows:
8.0-7.0-6.2-5.4(mm)。
Draw two passages, total draft 54.4% draws 720 ℃ ± 10 ℃ * 6～7h of after annealing, tensile strength (σ
b) 605MPa～710MPa.
Embodiment 3:
Trade mark 60Si2MnA heat (batch) number 94/825 specification 5.5mm
Its rolling mill practice:
980 ℃～1030 ℃ of start rolling temperatures advance 800 ℃～850 ℃ of the preceding temperature of finishing mill, 750 ℃～830 ℃ of laying temperatures;
Assay:
Tensile strength (σ
b) 1100MPa～1200MPa, the contraction percentage of area (φ) 39%～44%.
Pull-out test:
The direct pickling of wire rod raw material, yellow, dry back draws on vertical wire drawing machine, and pulling process is as follows:
5.5-4.5-4.0(mm)。
Draw a time, total draft 47.1% draws 720 ℃ ± 10 ℃ * 6～7h of after annealing, tensile strength (σ
b) 595MPa～680MPa.
Directly by 500 tons of above-mentioned explained hereafter, product is subjected to user's favorable comment with the silicon-manganese spring steel wire rod in drawing.
Claims (3)
1 one kinds of silicon-manganese spring steels (55Si2Mn, 60Si2MnA and 60Si2Mn) wire rod is characterized in that tensile strength (σ after the hot rolling
b) 1000MPa～1200MPa, the contraction percentage of area (ψ) 25%～50%, be organized as evenly, fine pearlite adds a little ferrite (or sorbite).
The described a kind of silicon-manganese spring steel of 2 claims 1 (55Si2Mn, 60Si2MnA and 60Si2Mn) wire rod is characterized in that tensile strength (σ after the 60Si2MnA hot rolling
b) 1010MPa～1170MPa, the contraction percentage of area (ψ) 25%～45%, be organized as evenly, fine pearlite adds a little ferrite (or sorbite).
The manufacturing process of the described a kind of silicon-manganese spring steel of 3 claims 1 (55Si2Mn, 60Si2MnA and 60Si2Mn) wire rod is characterized in that: the wire rod rolling operation adopts controlled rolling and control process for cooling, divides three sections controls:
1) rolls just, and be controlled at single-phase austenite perfect recrystallization zone, 980 ℃～1030 ℃;
2) finish to gauge is controlled at two-phase section, 800 ℃～900 ℃;
3) rolling line water-cool control to 750 ℃ after the finish to gauge～850 ℃ weave silk, Stelmer line traffic control translational speed 0.15m/s～0.25m/s, be cooled to below 400 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011140453A CN1174817C (en) | 2001-06-05 | 2001-06-05 | Spring steel wire for direct drawing and its making process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011140453A CN1174817C (en) | 2001-06-05 | 2001-06-05 | Spring steel wire for direct drawing and its making process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1389310A true CN1389310A (en) | 2003-01-08 |
| CN1174817C CN1174817C (en) | 2004-11-10 |
Family
ID=4660738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011140453A Expired - Fee Related CN1174817C (en) | 2001-06-05 | 2001-06-05 | Spring steel wire for direct drawing and its making process |
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| Country | Link |
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| CN (1) | CN1174817C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100342987C (en) * | 2004-12-31 | 2007-10-17 | 马鞍山钢铁股份有限公司 | Hot-rolling anneal-free coil rod production method for 8.8 grade high-strength cold forging steel |
| CN102650271A (en) * | 2012-04-18 | 2012-08-29 | 烟台北极星弹性元件有限公司 | Motive power clockwork spring for mechanical power equipment |
| CN103045935A (en) * | 2012-12-14 | 2013-04-17 | 天津钢铁集团有限公司 | Control method for surface decarburization and ferrite distribution of steel disc bar of spring |
| CN104439976A (en) * | 2014-12-02 | 2015-03-25 | 江阴吉爱倍万达精工有限公司 | Machining process for disc spring used for forging press |
| CN106812002A (en) * | 2015-12-01 | 2017-06-09 | 衡阳市新德力预应力有限公司 | A kind of production method of prestress wire |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4369415B2 (en) * | 2005-11-18 | 2009-11-18 | 株式会社神戸製鋼所 | Spring steel wire rod with excellent pickling performance |
| CN101825150B (en) * | 2010-03-30 | 2011-10-05 | 扬州市迅达碟形弹簧厂 | Bend-plate spring and making method thereof |
-
2001
- 2001-06-05 CN CNB011140453A patent/CN1174817C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100342987C (en) * | 2004-12-31 | 2007-10-17 | 马鞍山钢铁股份有限公司 | Hot-rolling anneal-free coil rod production method for 8.8 grade high-strength cold forging steel |
| CN102650271A (en) * | 2012-04-18 | 2012-08-29 | 烟台北极星弹性元件有限公司 | Motive power clockwork spring for mechanical power equipment |
| CN103045935A (en) * | 2012-12-14 | 2013-04-17 | 天津钢铁集团有限公司 | Control method for surface decarburization and ferrite distribution of steel disc bar of spring |
| CN104439976A (en) * | 2014-12-02 | 2015-03-25 | 江阴吉爱倍万达精工有限公司 | Machining process for disc spring used for forging press |
| CN106812002A (en) * | 2015-12-01 | 2017-06-09 | 衡阳市新德力预应力有限公司 | A kind of production method of prestress wire |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1174817C (en) | 2004-11-10 |
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Granted publication date: 20041110 |