CN107326161A - A kind of control method of medium carbon cold heading steel wire rod Widmannstatten structure - Google Patents
A kind of control method of medium carbon cold heading steel wire rod Widmannstatten structure Download PDFInfo
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- CN107326161A CN107326161A CN201710386067.7A CN201710386067A CN107326161A CN 107326161 A CN107326161 A CN 107326161A CN 201710386067 A CN201710386067 A CN 201710386067A CN 107326161 A CN107326161 A CN 107326161A
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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
- C21D8/02—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
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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
- C21D11/00—Process control or regulation for heat treatments
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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
- C21D8/02—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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
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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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- C21D2211/00—Microstructure comprising significant phases
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- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of control method of medium carbon cold heading steel wire rod Widmannstatten structure, the control method includes continuous casting, heating steel billet, controlled rolling, wire rod refrigerating work procedure；The continuous casting steel billet chemical composition composition and weight/mass percentage composition are：C：0.32 0.45%, Si：0.15 0.25%, Mn：0.65 0.75%, Al：0.010 0.040%, S≤0.015%, P≤0.015%, Cr≤0.10%, Ni≤0.10%, Cu≤0.10%, remaining is Fe and inevitable impurity.The present invention carries out press quenching processing by increasing by three cooling devices to continuous casting billet, strand is carried out strong cold, pass through controlled rolling and controlled cooling again, Widmannstatten structure is eliminated, material structure uniformity is improved, material hardness is reduced, considerably reduce follow-up cold-heading processing cracking rate, processing efficiency and final product quality are improved, waste of material is reduced, production cost is saved.
Description
Technical field
The invention belongs to iron and steel smelting technology field, and in particular to a kind of controlling party of medium carbon cold heading steel wire rod Widmannstatten structure
Method.
Background technology
Widmannstatten structure in medium carbon cold heading steel wire rod refers to the ferrite of the thick pro-eutectoid separated out in gill shape, therebetween
It there is the tissue of pearlite.Widmannstatten structure heredity is strong, and client can not eliminate during following process, thick Wei Shi groups
Knit serious, during cutting matrix, making the intensity and impact flexibility of cold-forging steel is significantly reduced, and material is accelerated during cold-heading in cold-heading process
In stress concentration, promote material to cross and ftractureed around Widmannstatten structure, cracking rate is up to 30%.
Although some data have been illustrated the origin cause of formation and control measure of Widmannstatten structure with document, patent, it is all based on
Books are theoretical or simulated test is drawn, have significant limitation to the application at scene.But the overwhelming majority all approves Widmannstatten structure shape
Contain carbon mass fraction, autstenitic grain size and austenite cooling velocity in Cheng Yugang（Transition temperature）It is relevant；For medium carbon steel, carbon
Mass fraction it is higher, austenite crystal is thinner, formed Widmannstatten structure ceiling temperature it is lower, i.e., compared with ability under big supercooling degree
Form Widmannstatten structure；And austenite crystal is thicker, the temperature of Widmannstatten structure formation is higher, produces tendency bigger.
Chinese patent CN103572021A discloses a kind of control method of widmannstatten structure in upgrade of C-Mn steel, by process
Key parameter is controlled, to reduce Widmannstatten structure, it is adaptable to sheet material；Chinese patent CN101082076A discloses one
The high-intensity magnetic field vacuum annealing method for eliminating thick Widmannstatten structure in sub-eutectoid steel is planted, belongs to part processing and heat treatment field.For
In terms of wire rod, the A of China Patent No. CN 103290187 disclose a kind of method for refining Low Carbon Steel Wire Rod tissue, and it utilizes low
The different Precipitation Temperatures of titanium, vanadium, nitrogen steel carbonitride and effect in carbon alloy steel, and optimal control rolling technological parameter, control carbon
The precipitation of nitride, refinement original austenite grain, the tissue for promoting ferrite forming core, refining wire rod, cost is of a relatively high；China
The A of patent CN 102560253 disclose a kind of manufacture method of the uniform high-quality cold-forging steel of structure property, belong to medium carbon cold heading steel
Wire production technical field, by the optimization of composition, steel rolling process, obtains preferable bainite structure and non-ferrous+pearly-lustre
Body tissue.Under different steel grade, different technology conditions, it is impossible to have the method that can be covered completely to solve Widmannstatten structure in steel
Appearance, and for medium carbon cold heading steel involved in the present invention, its Widmannstatten structure in rolling process easily occurs, especially
Φ 5.5mm- Φ 10mm specification wire rods surface more than 3 grades Widmannstatten structures of generally existing, it is therefore desirable to enter to overall process key parameter
Row control, especially prevents strand heredity, to reduce the generation of wire rod Widmannstatten structure.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of control method of medium carbon cold heading steel wire rod Widmannstatten structure.
In order to solve the above technical problems, the technical solution used in the present invention is：A kind of medium carbon cold heading steel wire rod Wei Shi groups
The control method knitted, the control method includes continuous casting, heating steel billet, controlled rolling, wire rod refrigerating work procedure；The continuous casting work
Sequence, gained continuous casting steel billet chemical composition composition and weight/mass percentage composition are：C：0.32-0.45%, Si：0.15-0.25%, Mn：
0.65-0.75%, Al：0.010-0.040%, S≤0.015%, P≤0.015%, Cr≤0.10%, Ni≤0.10%, Cu≤0.10%,
Remaining is Fe and inevitable impurity.
Continuous casting working procedure of the present invention, after continuous casting billet aligning is finished, three cooling devices are installed cutting front roller-way online,
Casting billet surface press quenching, strand temperature >=800 DEG C before quenching, casting blank surface temperature after quenching are realized using three cooling devices
≤200℃.Quench flame layer thickness 20-25mm, and quenching layer tissue is mainly martensite high tempering product-tempered sorbite, but most
Top layer is tempered martensite, and blank surface tissue is finer and close.
Heating steel billet process of the present invention, strand, which enters in heating furnace, is initially pre-heated to 1105-1135 DEG C, then heats
It is incubated to 1130-1150 DEG C, total time≤120min of the strand in heating furnace, oxygen content≤6% in stove.
Controlled rolling process of the present invention, the temperature that strand enters finishing mill is 905-935 DEG C, into the temperature of Laying head
Spend for 870-890 DEG C.
Wire rod refrigerating work procedure of the present invention, wire rod is after spinning process, and stay-warm case Close All, cooling blower is whole
Close, average roller table speed is 0.30m/s ~ 1.0m/s, and the natural air cooling on PF chains is coiled after collector.
The medium carbon cold heading steel wire rod hardness of control method production of the present invention≤90HRB, Widmannstatten structure≤1 grade；Tissue
For ferrite+pearlite.
The medium carbon cold heading steel wire rod of control method of the present invention production during later stage use, cold heading cracking rate≤
3%, processing efficiency and final product quality greatly improved.
Control method of the present invention is applied to the medium carbon cold heading steel wire rod that production specification is Φ 5.5-10mm.
Mentality of designing of the present invention：Press quenching processing, strand three times are carried out to continuous casting billet by increasing by three cooling devices
Cooling technique refers in strand after secondary cooling goes out withdrawal straightening machine, strong to strand progress cold, blank surface is formed after cooling down
Very thin martensitic structure, and strand center portion will keep higher temperature, and drawing effect is played to top layer martensitic structure；By
After three coolings, casting blank surface temperature can be cooled fast to less than 300 DEG C, make ferrite not have time enough to separate out and shape
Into one layer of oversaturated martensitic structure of carbon, during strand passes through roller-way, cold bed, strand center meeting outer layers heat transfer, this
Sample skin temperature can go up, and go up to certain temperature, inside and outside heat reaches balance, and strand is gradually cooled in atmosphere
Room temperature, whole process is approximately the heat treatment process of a quenching+tempering；By such processing, strand is by suitable
Heat after technique, form thinner crystallite dimension；Again by controlled rolling and controlled cooling, reduction wire rod surface Widmannstatten structure rank reaches and carried
High material structure uniformity, reduces follow-up cold-heading processing cracking rate, reduces waste of material, cost-effective.
Medium carbon cold heading steel wire rod Widmannstatten structure detection method refers to GB/T 13299.
It is using the beneficial effect produced by above-mentioned technical proposal：1st, the present invention is by increasing by three cooling devices to even
Strand carries out press quenching processing, strong to strand progress cold, blank surface is formed very thin martensitic structure after cooling down, and casts
Base center portion will keep higher temperature, and drawing effect is played to top layer martensitic structure；Again by controlled rolling and controlled cooling, Wei Shi groups are eliminated
Knit, improve material structure uniformity, reduce material hardness, considerably reduce follow-up cold-heading processing cracking rate, improve processing
Efficiency and final product quality.2nd, the present invention reduces waste of material, saves production cost.
Brief description of the drawings
Fig. 1 is the micro-organization chart of the medium carbon cold heading steel wire rod of embodiment 1；
Fig. 2 is the micro-organization chart of the medium carbon cold heading steel wire rod of embodiment 2；
Fig. 3 is the micro-organization chart of the medium carbon cold heading steel wire rod of embodiment 3；
Fig. 4 is the micro-organization chart of the medium carbon cold heading steel wire rod of embodiment 4；
Fig. 5 is the micro-organization chart of the medium carbon cold heading steel wire rod of embodiment 5；
Fig. 6 is the micro-organization chart of the medium carbon cold heading steel wire rod of embodiment 6；
Fig. 7 is the micro-organization chart of the medium carbon cold heading steel wire rod of comparative example 1；
Fig. 8 is the micro-organization chart of the medium carbon cold heading steel wire rod of comparative example 2；
Fig. 9 is the micro-organization chart of the medium carbon cold heading steel wire rod of comparative example 3.
Embodiment
With reference to specific embodiment, the present invention is further detailed explanation.
Embodiment 1
The control method of the present embodiment medium carbon cold heading steel wire rod Widmannstatten structure is cold including continuous casting, heating steel billet, controlled rolling, wire rod
But process, concrete technology step is as follows：
1）Continuous casting working procedure：Casting billet surface press quenching is realized using three cooling devices in casting process, strand temperature before quenching
825 DEG C, 185 DEG C of casting blank surface temperature after quenching, quench flame layer thickness 20mm；Steel billet chemical composition is constituted and weight/mass percentage composition
For：C：0.32%, Si：0.15%, Mn：0.65%, Al：0.01%, S：0.015%, P：0.015%, Cr：0.03%, Ni：0.01%, Cu：
0.010%, remaining is Fe and inevitable impurity；
2）Heating steel billet process：Strand, which enters in heating furnace, is initially pre-heated to 1110 DEG C, is then heated to 1130 DEG C of insulations, strand
Oxygen content 6% in total time 120min in heating furnace, stove；
3）Controlled rolling process：Strand enters 905 DEG C of finishing mill temperature, enters 870 DEG C of Laying head temperature；
4）Wire rod refrigerating work procedure：Wire rod is after spinning process, stay-warm case Close All, cooling blower Close All, average roller
Road speed is 0.30m/s, and the natural air cooling on PF chains is coiled after collector.
Wire rod tissue and performance：Wire rod specification Φ 6.5mm, hardness 85HRB, Widmannstatten structure<1 grade, it is organized as ferrite+pearl
Body of light；During client's later stage use, cold heading cracking rate 2.58%.
The microscopic structure of the present embodiment medium carbon cold heading steel wire rod is shown in Fig. 1.
Embodiment 2
The control method of the present embodiment medium carbon cold heading steel wire rod Widmannstatten structure is cold including continuous casting, heating steel billet, controlled rolling, wire rod
But process, concrete technology step is as follows：
1）Continuous casting working procedure：Casting billet surface press quenching is realized using three cooling devices in casting process, strand temperature before quenching
803 DEG C, 168 DEG C of casting blank surface temperature after quenching, quench flame layer thickness 24mm；Steel billet chemical composition is constituted and weight/mass percentage composition
For：C：0.45%, Si：0.25%, Mn：0.75%, Al：0.04%, S：0.006%, P：0.012%, Cr：0.05%, Ni：0.01%, Cu：
0.010%, remaining is Fe and inevitable impurity；
2）Heating steel billet process：Strand, which enters in heating furnace, is initially pre-heated to 1135 DEG C, is then heated to 1150 DEG C of insulations, strand
Oxygen content 6% in total time 100min in heating furnace, stove；
3）Controlled rolling process：Strand enters 935 DEG C of finishing mill temperature, enters 890 DEG C of Laying head temperature；
4）Wire rod refrigerating work procedure：Wire rod is after spinning process, stay-warm case Close All, cooling blower Close All, average roller
Road speed is 1.00m/s, and the natural air cooling on PF chains is coiled after collector.
Wire rod tissue and performance：Wire rod specification Φ 8.0mm, hardness 88HRB, Widmannstatten structure<1 grade, it is organized as ferrite+pearl
Body of light；During client's later stage use, cold heading cracking rate 1.96%.
The microscopic structure of the present embodiment medium carbon cold heading steel wire rod is shown in Fig. 2.
Embodiment 3
The control method of the present embodiment medium carbon cold heading steel wire rod Widmannstatten structure is cold including continuous casting, heating steel billet, controlled rolling, wire rod
But process, concrete technology step is as follows：
1）Continuous casting working procedure：Casting billet surface press quenching is realized using three cooling devices in casting process, strand temperature before quenching
816 DEG C, 190 DEG C of casting blank surface temperature after quenching, quench flame layer thickness 23mm；Steel billet chemical composition is constituted and weight/mass percentage composition
For：C：0.39%, Si：0.20%, Mn：0.70%, Al：0.03%, S：0.009%, P：0.014%, Cr：0.02%, Ni：0.01%, Cu：
0.010%, remaining is Fe and inevitable impurity；
2）Heating steel billet process：Strand, which enters in heating furnace, is initially pre-heated to 1120 DEG C, is then heated to 1140 DEG C of insulations, strand
Oxygen content 4% in total time 90min in heating furnace, stove；
3）Controlled rolling process：Strand enters 920 DEG C of finishing mill temperature, enters 880 DEG C of Laying head temperature；
4）Wire rod refrigerating work procedure：Wire rod is after spinning process, stay-warm case Close All, cooling blower Close All, average roller
Road speed is 0.50m/s, and the natural air cooling on PF chains is coiled after collector.
Wire rod tissue and performance：Wire rod specification Φ 10.0mm, hardness 85HRB, Widmannstatten structure<1 grade, be organized as ferrite+
Pearlite；During client's later stage use, cold heading cracking rate 1.24%.
The microscopic structure of the present embodiment medium carbon cold heading steel wire rod is shown in Fig. 3.
Embodiment 4
The control method of the present embodiment medium carbon cold heading steel wire rod Widmannstatten structure is cold including continuous casting, heating steel billet, controlled rolling, wire rod
But process, concrete technology step is as follows：
1）Continuous casting working procedure：Casting billet surface press quenching is realized using three cooling devices in casting process, strand temperature before quenching
808 DEG C, 185 DEG C of casting blank surface temperature after quenching, quench flame layer thickness 22mm；Steel billet chemical composition is constituted and weight/mass percentage composition
For：C：0.35%, Si：0.25%, Mn：0.70%, Al：0.04%, S：0.009%, P：0.015%, Cr：0.06%, Ni：0.01%, Cu：
0.01%, remaining is Fe and inevitable impurity；
2）Heating steel billet process：Strand, which enters in heating furnace, is initially pre-heated to 1110 DEG C, is then heated to 1132 DEG C of insulations, strand
Oxygen content 5% in total time 115min in heating furnace, stove；
3）Controlled rolling process：Strand enters 930 DEG C of finishing mill temperature, enters 870 DEG C of Laying head temperature；
4）Wire rod refrigerating work procedure：Wire rod is after spinning process, stay-warm case Close All, cooling blower Close All, average roller
Road speed is 0.70m/s, and the natural air cooling on PF chains is coiled after collector.
Wire rod tissue and performance：Wire rod specification Φ 9.0mm, hardness 83HRB, Widmannstatten structure<1 grade, it is organized as ferrite+pearl
Body of light；During client's later stage use, cold heading cracking rate 1.08%.
The microscopic structure of the present embodiment medium carbon cold heading steel wire rod is shown in Fig. 4.
Embodiment 5
The control method of the present embodiment medium carbon cold heading steel wire rod Widmannstatten structure is cold including continuous casting, heating steel billet, controlled rolling, wire rod
But process, concrete technology step is as follows：
1）Continuous casting working procedure：Casting billet surface press quenching is realized using three cooling devices in casting process, strand temperature before quenching
820 DEG C, 190 DEG C of casting blank surface temperature after quenching, quench flame layer thickness 21mm；Steel billet chemical composition is constituted and weight/mass percentage composition
For：C：0.42%, Si：0.22%, Mn：0.67%, Al：0.03%, S：0.011%, P：0.009%, Cr：0.05%, Ni：0.01%, Cu：
0.01%, remaining is Fe and inevitable impurity；
2）Heating steel billet process：Strand, which enters in heating furnace, is initially pre-heated to 1120 DEG C, is then heated to 1145 DEG C of insulations, strand
Oxygen content 4% in total time 100min in heating furnace, stove；
3）Controlled rolling process：Strand enters 930 DEG C of finishing mill temperature, enters 890 DEG C of Laying head temperature；
4）Wire rod refrigerating work procedure：Wire rod is after spinning process, stay-warm case Close All, cooling blower Close All, average roller
Road speed is 0.70m/s, and the natural air cooling on PF chains is coiled after collector.
Wire rod tissue and performance：Wire rod specification Φ 6.0mm, hardness 86HRB, Widmannstatten structure<1 grade, it is organized as ferrite+pearl
Body of light；During client's later stage use, cold heading cracking rate 1.82%.
The microscopic structure of the present embodiment medium carbon cold heading steel wire rod is shown in Fig. 5.
Embodiment 6
The control method of the present embodiment medium carbon cold heading steel wire rod Widmannstatten structure is cold including continuous casting, heating steel billet, controlled rolling, wire rod
But process, concrete technology step is as follows：
1）Continuous casting working procedure：Casting billet surface press quenching is realized using three cooling devices in casting process, strand temperature before quenching
800 DEG C, 200 DEG C of casting blank surface temperature after quenching, quench flame layer thickness 25mm；Steel billet chemical composition is constituted and weight/mass percentage composition
For：C：0.40%, Si：0.20%, Mn：0.69%, Al：0.02%, S：0.012%, P：0.011%, Cr：0.10%, Ni：0.10%, Cu：
0.10%, remaining is Fe and inevitable impurity；
2）Heating steel billet process：Strand, which enters in heating furnace, is initially pre-heated to 1105 DEG C, is then heated to 1140 DEG C of insulations, strand
Oxygen content 3% in total time 105min in heating furnace, stove；
3）Controlled rolling process：Strand enters 925 DEG C of finishing mill temperature, enters 885 DEG C of Laying head temperature；
4）Wire rod refrigerating work procedure：Wire rod is after spinning process, stay-warm case Close All, cooling blower Close All, average roller
Road speed is 0.80m/s, and the natural air cooling on PF chains is coiled after collector.
Wire rod tissue and performance：Wire rod specification Φ 5.5mm, hardness 90HRB, 1 grade of Widmannstatten structure is organized as ferrite+pearl
Body of light；During client's later stage use, cold heading cracking rate 3.0%.
The microscopic structure of the present embodiment medium carbon cold heading steel wire rod is shown in Fig. 6.
Comparative example 1
This comparative example differs only in steel making working procedure with embodiment 1：Three cooling techniques are not used in casting billet surface after continuous casting, roll
Process processed：Enter 950 DEG C of final rolling temperature, 920 DEG C of laying temperature, 1.5 DEG C/s of wire rod cooling velocity.
The microscopic structure of this comparative example medium carbon cold heading steel wire rod is shown in Fig. 7.
Comparative example 2
This comparative example differs only in steel making working procedure with embodiment 2：Three cooling techniques are not used in casting billet surface after continuous casting, roll
Process processed：Enter 938 DEG C of final rolling temperature, 931 DEG C of laying temperature, 1.3 DEG C/s of wire rod cooling velocity.
The microscopic structure of this comparative example medium carbon cold heading steel wire rod is shown in Fig. 8.
Comparative example 3
This comparative example differs only in steel making working procedure with embodiment 3：Three cooling techniques are not used in casting billet surface after continuous casting, roll
Process processed：Enter 948 DEG C of final rolling temperature, 927 DEG C of laying temperature, 1.3 DEG C/s of wire rod cooling velocity.
The microscopic structure of this comparative example medium carbon cold heading steel wire rod is shown in Fig. 9.
By contrasting accompanying drawing 1-9 as can be seen that the medium carbon cold heading steel Widmannstatten structure level that Fig. 1-6 application the inventive method is produced
Not, content is significantly lower than Fig. 7-9；1 grade of Widmannstatten structure rank in Fig. 1-6, and only exist with wire rod edge, content is few；And Fig. 7-9
3 grades of Widmannstatten structure rank, content is more, all Widmannstatten structures in wire rod cross section.
Above example is only used to illustrative and not limiting technical scheme, although with reference to above-described embodiment to this hair
It is bright to be described in detail, it will be understood by those within the art that：Still the present invention can be modified or be waited
With replacement, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should cover the power in the present invention
Among sharp claimed range.
Claims (10)
1. a kind of control method of medium carbon cold heading steel wire rod Widmannstatten structure, it is characterised in that the control method includes continuous casting, steel
Base heating, controlled rolling, wire rod refrigerating work procedure；The continuous casting working procedure, gained continuous casting steel billet chemical composition composition and quality percentage
Content is：C：0.32-0.45%, Si：0.15-0.25%, Mn：0.65-0.75%, Al：0.010-0.040%, S≤0.015%, P≤
0.015%, Cr≤0.10%, Ni≤0.10%, Cu≤0.10%, remaining is Fe and inevitable impurity.
2. the control method of a kind of medium carbon cold heading steel wire rod Widmannstatten structure according to claim 1, it is characterised in that described
Continuous casting working procedure, after continuous casting billet aligning is finished, is cutting front roller-way online using three cooling devices, is realizing that casting billet surface is quenched online
Fire.
3. the control method of a kind of medium carbon cold heading steel wire rod Widmannstatten structure according to claim 1, it is characterised in that described
Continuous casting working procedure, after continuous casting billet aligning is finished, casting billet surface press quenching, strand temperature >=800 DEG C before quenching, strand after quenching
Surface temperature≤200 DEG C.
4. the control method of a kind of medium carbon cold heading steel wire rod Widmannstatten structure according to claim 1, it is characterised in that described
Heating steel billet process, strand, which enters in heating furnace, is initially pre-heated to 1105-1135 DEG C, is then heated to 1130-1150 DEG C of insulation.
5. the control method of a kind of medium carbon cold heading steel wire rod Widmannstatten structure according to claim 1, it is characterised in that described
Oxygen content≤6% in heating steel billet process, total time≤120min of the strand in heating furnace, stove.
6. the control method of a kind of medium carbon cold heading steel wire rod Widmannstatten structure according to claim 1, it is characterised in that described
Controlled rolling process, the temperature that strand enters finishing mill is 905-935 DEG C, and the temperature into Laying head is 870-890 DEG C.
7. a kind of control method of medium carbon cold heading steel wire rod Widmannstatten structure according to claim 1-6 any one, it is special
Levy and be, the wire rod refrigerating work procedure, stay-warm case Close All, cooling blower Close All, average roller table speed is 0.30m/s
~ 1.0m/s, coils the natural air cooling on PF chains after collector.
8. a kind of control method of medium carbon cold heading steel wire rod Widmannstatten structure according to claim 1-6 any one, it is special
Levy and be, the medium carbon cold heading steel wire rod hardness that the control method is produced≤90HRB, Widmannstatten structure≤1 grade；It is organized as ferrite
+ pearlite.
9. a kind of control method of medium carbon cold heading steel wire rod Widmannstatten structure according to claim 1-6 any one, it is special
Levy and be, the medium carbon cold heading steel wire rod of the control method production is during later stage use, cold heading cracking rate≤3%.
10. a kind of control method of medium carbon cold heading steel wire rod Widmannstatten structure according to claim 1-6 any one, it is special
Levy and be, the control method is applied to the medium carbon cold heading steel wire rod that production specification is Φ 5.5-10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710386067.7A CN107326161B (en) | 2017-05-26 | 2017-05-26 | A kind of control method of medium carbon cold heading steel wire rod Widmannstatten structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114032377A (en) * | 2021-10-29 | 2022-02-11 | 邯郸钢铁集团有限责任公司 | Production method of wire rod for ratchet ring |
| CN114231840A (en) * | 2021-11-24 | 2022-03-25 | 邯郸钢铁集团有限责任公司 | Wire rod for high-hardenability medium-carbon cold heading steel and production process thereof |
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| CN102228968A (en) * | 2011-06-20 | 2011-11-02 | 重庆大学 | Method for implementing direct conveying and charging of high-strength low alloy steel continuously-cast bloom |
| CN102560253A (en) * | 2012-03-13 | 2012-07-11 | 南京钢铁股份有限公司 | Manufacturing method of high-quality cold heading steel with uniform structure property |
| CN103302262A (en) * | 2013-06-25 | 2013-09-18 | 济钢集团有限公司 | Continuous casting plate blank surface quenching technology and used device |
| CN105296865A (en) * | 2014-06-09 | 2016-02-03 | 鞍钢股份有限公司 | Production method of medium-carbon chromium-containing cold heading steel wire rod |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102228968A (en) * | 2011-06-20 | 2011-11-02 | 重庆大学 | Method for implementing direct conveying and charging of high-strength low alloy steel continuously-cast bloom |
| CN102560253A (en) * | 2012-03-13 | 2012-07-11 | 南京钢铁股份有限公司 | Manufacturing method of high-quality cold heading steel with uniform structure property |
| CN103302262A (en) * | 2013-06-25 | 2013-09-18 | 济钢集团有限公司 | Continuous casting plate blank surface quenching technology and used device |
| CN105296865A (en) * | 2014-06-09 | 2016-02-03 | 鞍钢股份有限公司 | Production method of medium-carbon chromium-containing cold heading steel wire rod |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114032377A (en) * | 2021-10-29 | 2022-02-11 | 邯郸钢铁集团有限责任公司 | Production method of wire rod for ratchet ring |
| CN114231840A (en) * | 2021-11-24 | 2022-03-25 | 邯郸钢铁集团有限责任公司 | Wire rod for high-hardenability medium-carbon cold heading steel and production process thereof |
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| CN107326161B (en) | 2019-06-07 |
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