CN108611572A - A kind of high-ductility hypereutectoid steel spring plate and its production method - Google Patents
A kind of high-ductility hypereutectoid steel spring plate and its production method Download PDFInfo
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- CN108611572A CN108611572A CN201810446664.9A CN201810446664A CN108611572A CN 108611572 A CN108611572 A CN 108611572A CN 201810446664 A CN201810446664 A CN 201810446664A CN 108611572 A CN108611572 A CN 108611572A
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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
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
A kind of high-ductility hypereutectoid steel spring plate, by weight percentage, chemical composition is：C：0.80~0.90%, Si≤0.06%, Mn：0.80~1.30%, Cr：0.20~0.40%, and limit P<0.010%, S<0.005%, surplus is Fe and inevitable impurity.Compared with prior art, the beneficial effects of the invention are as follows：1) its excellent plasticity, for elongation after fracture 21% or more, machinability is strong, it can be achieved that 12% cold rolling reduction ratio, reduces downstream production cost under hot-rolled state；2) not easy to crack when downstream client carries out slitting, cold rolling.
Description
Technical field
The present invention relates to metal material field, it is related specifically to a kind of high-ductility hypereutectoid steel spring plate and its producer
Method.The steel plate of the present invention is primarily adapted for use in the products such as motor spring parts, cutlery.
Background technology
It is well known that the carbon content of hypereutectoid spring steel is more than 0.77%, with the increase of carbon content, its steel is more crisp, breaks
Elongation percentage is less than 10% afterwards, and downstream client is the links such as slitting, cold rolling are easily cracking, the production accidents such as break, serious shadow
Ring rhythm of production and efficiency.Therefore it is badly in need of the hypereutectoid spring steel that steel mill develops a kind of high-ductility, is easy to Downstream processing.
Publication No. is that the Chinese patent application of CN 201110134314.7 discloses a kind of high-carbon vanadium alloy abrasion-resistant steel lining plate
And preparation method thereof, it is the addition V micro alloying elements in common C-Mn component systems, heat treatments side is waited by the way that normalizing is quenched
The elongation after fracture of hypereutectoid steel is increased to 20% or more by method.Though the plasticity of steel plate can be improved in this method, increase microalloy
Element and heat treatment process, production cost greatly increase, and do not have the market competitiveness.Similar patent also has therewith
The preparation method with good cold forming high-carbon steel of CN201410532909.1 was improved using the method for increasing annealing operation
The plasticity of eutectoid steel, production cost is big, no market competitiveness.
The Chinese patent application that publication No. is CN200880119611.0 discloses tensile strength and the excellent height of elongation percentage
Carbon steel sheet and its manufacturing method also relate to the production method of hypereutectoid steel plate in the patent, for parts such as sunpender, vehicle frames,
Perhaps, the production method will increase heat treatment process, while also need to the micro alloying elements such as addition Mo, Ni and Ti, production cost
It is high.
It is found by coordinate indexing, the process program for how improving hot rolling hypereutectoid steel plate plasticity has no and refers to.
Invention content
The present invention provides a kind of high-ductility hypereutectoid steel spring plate and its production method, obtained steel plate elongation after fracture
Reach 20% or more, 12% or more cold rolling reduction ratio can be achieved under rolled.
In order to achieve the above object, the present invention is realized using following technical scheme：
A kind of high-ductility hypereutectoid steel spring plate, by weight percentage, chemical composition is：C：0.80~0.90%,
Si≤0.06%, Mn：0.80~1.30%, Cr：0.20~0.40%, and limit P<0.010%, S<0.005%, surplus Fe
With inevitable impurity.
The main function of light plate ingredient of the present invention is：
C:Carbon is most important solution strengthening element in steel, is the guarantee of steel strength.In view of wanting for spring steel elasticity
It asks, the optimized scope of carbon is 0.80~0.90% in the present invention.
Si：Silicon is solution strengthening element, can contribute the intensity of steel plate.However, silicon excessively high in steel can give hot rolling surface
Quality makes troubles.The content of silicon is Si≤0.06% in the present invention.
Mn：Manganese is to play the role of solution strengthening and fining ferrite grains.But manganese content is excessively high, turns postponing pearlite
While change, ferritic precipitation is also postponed, otherwise pearlite easily occurs in tissue.Therefore, select manganese content be 0.80~
1.30%.
P：Phosphorus can improve the formation temperature of α phases, expand the temperature range for forming α phases.But phosphorus content is excessive, can make steel plate
Processability deteriorate, higher elongation percentage in order to obtain, therefore 0.010% will be limited to thereon.
S：Sulphur is mingled with by forming MnS sulfides, becomes the starting point of crackle and processing performance is made to deteriorate, therefore content is got over
It is few better, it will be limited to 0.005% thereon.
Cr：Chromium is carbide former, can postpone perlitic transformation.Its content can hinder ferrite when being more than 0.20%
It is formed with pearlite, significantly improves the quenching degree of steel, thinning microstructure plays reinforcing effect.Chromium content is excessively high, can make adding for material
Work, mouldability are deteriorated.Therefore the present invention in chromium content optimized scope between 0.20~0.40%.
A kind of production method of high-ductility hypereutectoid steel spring plate, the production method include the following steps：
1) continuous casting billet enters stove mode using hot charging, and hot steel bloom temperature starts to be preheated to and come out of the stove certainly at 500~600 DEG C
Heating time controlled at 200~250 minutes；
2) each phase temperature and time control：Preheating section Control for Kiln Temperature is at 950~1100 DEG C；Bringing-up section Control for Kiln Temperature exists
1150~1250 DEG C, heating time controlled between 75~95 minutes；Soaking zone Control for Kiln Temperature is at 1240~1270 DEG C, soaking
Between control between 35~40 minutes；
3) reducing atmosphere is the mixed gas of coal gas and air, and the coefficient of excess air of wherein bringing-up section to soaking zone is：
The coefficient of excess air of bringing-up section is：0.75~0.90；The coefficient of excess air of soaking zone is：0.75~0.85；
4) rolling mill practice：Recrystallization zone rolling temperature is less than 1060 DEG C, workpiece thickness 35-50mm, Unhydrated cement
Finishing temperature is 820-900 DEG C, finished product thickness 2.5-6.0mm；
5) cooling technique：Using leading portion, quickly continuous section cooling, cooling rate are 30-50 DEG C/s after finish to gauge；
6) coiling temperature：Coiling temperature is 600-700 DEG C.
Compared with prior art, the beneficial effects of the invention are as follows：
1) its excellent plasticity, elongation after fracture can reach 21% or more, and machinability is strong, under hot-rolled state, it can be achieved that
12% cold rolling reduction ratio reduces downstream production cost；
2) not easy to crack when downstream client carries out slitting, cold rolling.
Specific implementation mode
The specific implementation mode of the present invention is described further with reference to embodiment：
A kind of high-ductility hypereutectoid steel spring plate of the present invention is to carry out optimizing components, together on the basis of C-Mn systems composition of steel
A certain amount of Cr elements of Shi Tianjia obtain elongation after fracture and reach 21% by rolling technological parameter, cooling technique state modulator
Above hypereutectoid spring steel, by weight percentage, chemical composition is：C：0.80~0.90%, Si≤0.06%, Mn：
0.80~1.30%, Cr：0.20~0.40%, and limit P<0.010%, S<0.005%, surplus be Fe and inevitably it is miscellaneous
Matter.It finally is organized as pearlite and a small amount of cementite, the piece interlamellar spacing of medium pearlite is at 0.2-0.4 μm.The present invention is suitable for
The production of hypereutectoid barrel band of the carbon content in 0.8~0.9% range.
A kind of production method of high-ductility hypereutectoid steel spring plate, the technological process of production are：Molten iron pretreatment → converter smelting
Refining → LF or RH refinings → Calcium treatment → sheet billet continuous casting → hot charging → heating → rolling → section cooling → is batched → inspection → and is entered
Library → stacking slow cooling；Specifically comprise the following steps：
1) continuous casting billet enters stove mode using hot charging, and hot steel bloom temperature starts to be preheated to and come out of the stove certainly at 500~600 DEG C
Heating time controlled at 200~250 minutes；
2) each phase temperature and time control：Preheating section Control for Kiln Temperature is at 950~1100 DEG C；Bringing-up section Control for Kiln Temperature exists
1150~1250 DEG C, heating time controlled between 75~95 minutes；Soaking zone Control for Kiln Temperature is at 1240~1270 DEG C, soaking
Between control between 35~40 minutes；
3) reducing atmosphere is the mixed gas of coal gas and air, flow-rate ratio 1:1.1-1.4 wherein bringing-up section is to soaking zone
Coefficient of excess air be：The coefficient of excess air of bringing-up section is：0.75~0.90；The coefficient of excess air of soaking zone is：
0.75~0.85；
4) rolling mill practice：Using controlled rolling means, recrystallization zone rolling temperature is less than 1060 DEG C, and workpiece thickness is
35-50mm, Unhydrated cement finishing temperature are 820-900 DEG C, finished product thickness 2.5-6.0mm；Higher recrystallization zone rolling
Temperature and larger drafts make original austenite grains be refined；
5) cooling technique：Using leading portion, quickly continuous section cooling, cooling rate are 30-50 DEG C/s after finish to gauge；Continuously
Laminar flow cooling technology makes ferrite crystal grain largely quickly be precipitated, and ensures that pearlitic structrure refines enough, makes its piece interlamellar spacing control
System is between 0.2-0.4 μm.
6) coiling temperature：Coiling temperature is 600-700 DEG C.Coiling temperature is excessively high to cause tissue coarse so that steel is crisp；It crosses
It is low that intensity can be made excessively high, its elongation after fracture is reduced, in temperature range, it is ensured that the intensity of coiler plate and good plasticity.
Finally by coil of strip stacking slow cooling.
The embodiment of the present invention is as follows：The continuous casting billet that thickness is 230mm is heated to 1240~1270 DEG C, heating and thermal insulation 200-
After 250 minutes, using controlled rolling means, workpiece thickness 35-50mm, finished product thickness 2.5-6.0mm.The 6 of the present invention
The specific ingredient of a embodiment, temperature schedule are shown in Table 1-5, and 6 are shown in Table at the performance of plain plate.
The chemical composition (wt, %) of 1 embodiment of the present invention of table
The temperature system of 2 embodiment of the present invention of table
The heating of 3 embodiment of the present invention of table and soaking zone time (min)
4 each bringing-up section coefficient of excess air of the present invention of table
The hot-rolling temperature system of 5 embodiment of the present invention of table
The mechanical property parameters and cold rolling reduction ratio of 6 embodiment of the present invention of table
Claims (2)
1. a kind of high-ductility hypereutectoid steel spring plate, which is characterized in that by weight percentage, chemical composition is：C：0.80
~0.90%, Si≤0.06%, Mn：0.80~1.30%, Cr：0.20~0.40%, and limit P<0.010%, S<
0.005%, surplus is Fe and inevitable impurity.
2. a kind of production method of high-ductility hypereutectoid steel spring plate as described in claim 1, which is characterized in that the producer
Method includes the following steps：
1) continuous casting billet enters stove mode using hot charging, and hot steel bloom temperature starts to be preheated to the heating come out of the stove certainly at 500~600 DEG C
Time control was at 200~250 minutes；
2) each phase temperature and time control：Preheating section Control for Kiln Temperature is at 950~1100 DEG C；Bringing-up section Control for Kiln Temperature 1150~
1250 DEG C, heating time controlled between 75~95 minutes；At 1240~1270 DEG C, soaking time controls soaking zone Control for Kiln Temperature
Between 35~40 minutes；
3) reducing atmosphere is the mixed gas of coal gas and air, and the coefficient of excess air of wherein bringing-up section to soaking zone is：Heating
Section coefficient of excess air be：0.75~0.90；The coefficient of excess air of soaking zone is：0.75~0.85；
4) rolling mill practice：Recrystallization zone rolling temperature is less than 1060 DEG C, workpiece thickness 35-50mm, Unhydrated cement finish to gauge
Temperature is 820-900 DEG C, finished product thickness 2.5-6.0mm；
5) cooling technique：Using leading portion, quickly continuous section cooling, cooling rate are 30-50 DEG C/s after finish to gauge；
6) coiling temperature：Coiling temperature is 600-700 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810446664.9A CN108611572A (en) | 2018-05-11 | 2018-05-11 | A kind of high-ductility hypereutectoid steel spring plate and its production method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810446664.9A CN108611572A (en) | 2018-05-11 | 2018-05-11 | A kind of high-ductility hypereutectoid steel spring plate and its production method |
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| CN108611572A true CN108611572A (en) | 2018-10-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109338231A (en) * | 2018-12-06 | 2019-02-15 | 山西太钢不锈钢股份有限公司 | A kind of garden instrument hot-rolled coil and its manufacturing method |
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Application publication date: 20181002 |