CN107326161B - 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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- CN107326161B CN107326161B CN201710386067.7A CN201710386067A CN107326161B CN 107326161 B CN107326161 B CN 107326161B CN 201710386067 A CN201710386067 A CN 201710386067A CN 107326161 B CN107326161 B CN 107326161B
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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
-
- 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
-
- 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
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- 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
-
- 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
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 cooling process;The continuous casting steel billet chemical component composition and mass percentage are as follows: 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 to continuous casting billet by increasing cooling device three times, slab is carried out strong cold, pass through controlled rolling and controlled cooling again, Widmannstatten structure is eliminated, material structure uniformity is improved, reduces material hardness, considerably reduce subsequent cold-heading processing cracking rate, processing efficiency and final product quality are improved, waste of material is reduced, saves production cost.
Description
Technical field
The invention belongs to iron and steel smelting technology fields, and in particular to a kind of controlling party of medium carbon cold heading steel wire rod Widmannstatten structure
Method.
Background technique
Widmannstatten structure in medium carbon cold heading steel wire rod refers to the ferrite of the coarse pro-eutectoid being precipitated in gill shape, therebetween
There is the tissues of pearlite.Widmannstatten structure heredity is strong, and client can not eliminate during following process, coarse Wei Shi group
It knits serious, when cutting matrix, significantly reduces the intensity of cold-forging steel and impact flexibility, when cold-heading accelerates material in cold-heading process
In stress concentrate, promote material to cross and crack around Widmannstatten structure, cracking rate is up to 30%.
Although some data illustrate the origin cause of formation and control measure of Widmannstatten structure with document, patent, it is all based on
Books are theoretical or simulation test obtains, have significant limitation to the application at scene.But the overwhelming majority all approves Widmannstatten structure shape
It is related containing carbon mass fraction, autstenitic grain size and austenite cooling velocity (transition temperature) in Cheng Yugang;For medium carbon steel, carbon
Mass fraction it is higher, austenite grain is thinner, and the ceiling temperature for forming Widmannstatten structure is lower, i.e., compared with ability under big supercooling degree
Form Widmannstatten structure;And austenite grain is coarseer, the temperature that Widmannstatten structure is formed is higher, and it is bigger to generate tendency.
Chinese patent CN103572021A discloses a kind of control method of widmannstatten structure in upgrade of C-Mn steel, by process
Key parameter is controlled, and to reduce Widmannstatten structure, is suitable for plate;Chinese patent CN101082076A discloses one
Kind eliminates the high-intensity magnetic field vacuum annealing method of coarse Widmannstatten structure in sub-eutectoid steel, belongs to part processing and heat treatment field.For
In terms of wire rod, 103290187 A of China Patent No. CN discloses a kind of method for refining Low Carbon Steel Wire Rod tissue, utilizes low
Titanium, vanadium, nitrogen steel carbonitride difference Precipitation Temperature 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, the cost is relatively high;China
102560253 A of patent CN discloses a kind of manufacturing method of the uniform high-quality cold-forging steel of structure property, belongs to medium carbon cold heading steel
Wire production technical field obtains ideal bainite structure and non-ferrous+pearly-lustre by the optimization of ingredient, steel rolling process
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 according to the present invention, Widmannstatten structure easily occurs in rolling process, especially
Generally existing 3 grades of Φ 5.5mm- Φ 10mm specification wire rod surface or more Widmannstatten structure, it is therefore desirable to overall process key parameter into
Row control especially prevents slab hereditary, to reduce the generation of wire rod Widmannstatten structure.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of control methods 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 group
The control method knitted, the control method include continuous casting, heating steel billet, controlled rolling, wire rod cooling process;The continuous casting work
Sequence, gained continuous casting steel billet chemical component composition and mass percentage are as follows: 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 installs cooling device three times cutting front roller-way after continuous casting billet aligning online,
Casting billet surface press quenching is realized using cooling device three times, slab temperature >=800 DEG C before quenching, casting blank surface temperature after quenching
≤200℃.Quench flame layer thickness 20-25mm, and quenching layer tissue is mainly martensite high tempering product-tempered sorbite, but most
Surface layer is tempered martensite, and blank surface tissue is finer and close.
Heating steel billet process of the present invention, slab, which enters, is initially pre-heated to 1105-1135 DEG C in heating furnace, then heats
It is kept the temperature to 1130-1150 DEG C, the total time≤120min of slab in heating furnace, oxygen content≤6% in furnace.
Controlled rolling process of the present invention, the temperature that slab enters finishing mill is 905-935 DEG C, into the temperature of Laying head
Degree is 870-890 DEG C.
Wire rod cooling process of the present invention, wire rod after process of spinning, all close by insulation cover, and cooling blower is whole
It closes, average roller table speed is 0.30m/s ~ 1.0m/s, and the natural air cooling on PF chain is coiled after collector.
Medium carbon cold heading steel wire rod hardness≤90HRB of control method production of the present invention, Widmannstatten structure≤1 grade;Tissue
For ferrite+pearlite.
The medium carbon cold heading steel wire rod of control method of the present invention production in later period use process, cold heading cracking rate≤
3%, processing efficiency and final product quality greatly improved.
Control method of the present invention is suitable for 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 is carried out to continuous casting billet by increasing cooling device three times, slab is three times
Cooling technique refers in slab after secondary cooling goes out withdrawal straightening machine, strong to slab progress cold, makes to be formed after blank surface is cooling
Very thin martensitic structure, and slab center portion will keep higher temperature, play drawing effect to surface layer martensitic structure;By
After cooling down three times, casting blank surface temperature can be cooled fast to 300 DEG C hereinafter, ferrite is made not have time enough to be precipitated and shape
At one layer of oversaturated martensitic structure of carbon, during slab passes through roller-way, cold bed, slab center meeting outer layers heat transfer, this
Sample skin temperature can be gone up, and be gone up to certain temperature, inside and outside heat reaches balance, and slab is gradually cooled in air
Room temperature, whole process are approximately the heat treatment process of a quenching+tempering;By such processing, slab is by suitable
After heating process, thinner crystallite dimension is formed;Again by controlled rolling and controlled cooling, wire rod surface Widmannstatten structure rank is reduced, reaches and mentions
High material structure uniformity reduces subsequent cold-heading processing cracking rate, reduces waste of material, save the cost.
Medium carbon cold heading steel wire rod Widmannstatten structure detection method refers to GB/T 13299.
The beneficial effects of adopting the technical scheme are that 1, the present invention by increase three times cooling device to even
Slab carries out press quenching processing, strong to slab progress cold, makes to form very thin martensitic structure after blank surface is cooling, and casts
Base center portion will keep higher temperature, play drawing effect to surface layer martensitic structure;Again by controlled rolling and controlled cooling, Wei Shi group is eliminated
It knits, improves material structure uniformity, reduce material hardness, considerably reduce subsequent cold-heading processing cracking rate, improve processing
Efficiency and final product quality.2, the present invention reduces waste of material, saves production cost.
Detailed description of the invention
Fig. 1 is the micro-organization chart of 1 medium carbon cold heading steel wire rod of embodiment;
Fig. 2 is the micro-organization chart of 2 medium carbon cold heading steel wire rod of embodiment;
Fig. 3 is the micro-organization chart of 3 medium carbon cold heading steel wire rod of embodiment;
Fig. 4 is the micro-organization chart of 4 medium carbon cold heading steel wire rod of embodiment;
Fig. 5 is the micro-organization chart of 5 medium carbon cold heading steel wire rod of embodiment;
Fig. 6 is the micro-organization chart of 6 medium carbon cold heading steel wire rod of embodiment;
Fig. 7 is the micro-organization chart of 1 medium carbon cold heading steel wire rod of comparative example;
Fig. 8 is the micro-organization chart of 2 medium carbon cold heading steel wire rod of comparative example;
Fig. 9 is the micro-organization chart of 3 medium carbon cold heading steel wire rod of comparative example.
Specific embodiment
The present invention will be further described in detail below with reference to specific embodiments.
Embodiment 1
The control method of the present embodiment medium carbon cold heading steel wire rod Widmannstatten structure includes continuous casting, heating steel billet, controlled rolling, disk
Cooling process, the specific process steps are as follows:
1) continuous casting working procedure: realizing casting billet surface press quenching using cooling device three times in continuous casting process, slab before quenching
825 DEG C of temperature, 185 DEG C of casting blank surface temperature after quenching, quench flame layer thickness 20mm;Steel billet chemical component composition and quality percentage contain
Amount are as follows: 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: slab, which enters in heating furnace, is initially pre-heated to 1110 DEG C, is then heated to 1130 DEG C of heat preservations,
The total time 120min of slab in heating furnace, oxygen content 6% in furnace;
3) controlled rolling process: slab is into 905 DEG C of finishing mill temperature, into 870 DEG C of Laying head temperature;
4) wire rod cooling process: wire rod after process of spinning, all close by insulation cover, and cooling blower is all closed, and is put down
Equal roller table speed is 0.30m/s, and the natural air cooling on PF chain is coiled after collector.
Wire rod tissue and performance: wire rod specification Φ 6.5mm, hardness 85HRB, Widmannstatten structure < 1 grade is organized as ferrite+pearl
Body of light;In client's later period use process, 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 includes continuous casting, heating steel billet, controlled rolling, disk
Cooling process, the specific process steps are as follows:
1) continuous casting working procedure: realizing casting billet surface press quenching using cooling device three times in continuous casting process, slab before quenching
803 DEG C of temperature, 168 DEG C of casting blank surface temperature after quenching, quench flame layer thickness 24mm;Steel billet chemical component composition and quality percentage contain
Amount are as follows: 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: slab, which enters in heating furnace, is initially pre-heated to 1135 DEG C, is then heated to 1150 DEG C of heat preservations,
The total time 100min of slab in heating furnace, oxygen content 6% in furnace;
3) controlled rolling process: slab is into 935 DEG C of finishing mill temperature, into 890 DEG C of Laying head temperature;
4) wire rod cooling process: wire rod after process of spinning, all close by insulation cover, and cooling blower is all closed, and is put down
Equal roller table speed is 1.00m/s, and the natural air cooling on PF chain is coiled after collector.
Wire rod tissue and performance: wire rod specification Φ 8.0mm, hardness 88HRB, Widmannstatten structure < 1 grade is organized as ferrite+pearl
Body of light;In client's later period use process, 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 includes continuous casting, heating steel billet, controlled rolling, disk
Cooling process, the specific process steps are as follows:
1) continuous casting working procedure: realizing casting billet surface press quenching using cooling device three times in continuous casting process, slab before quenching
816 DEG C of temperature, 190 DEG C of casting blank surface temperature after quenching, quench flame layer thickness 23mm;Steel billet chemical component composition and quality percentage contain
Amount are as follows: 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: slab, which enters in heating furnace, is initially pre-heated to 1120 DEG C, is then heated to 1140 DEG C of heat preservations,
The total time 90min of slab in heating furnace, oxygen content 4% in furnace;
3) controlled rolling process: slab is into 920 DEG C of finishing mill temperature, into 880 DEG C of Laying head temperature;
4) wire rod cooling process: wire rod after process of spinning, all close by insulation cover, and cooling blower is all closed, and is put down
Equal roller table speed is 0.50m/s, and the natural air cooling on PF chain is coiled after collector.
Wire rod tissue and performance: wire rod specification Φ 10.0mm, hardness 85HRB, Widmannstatten structure < 1 grade, organize for ferrite+
Pearlite;In client's later period use process, 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 includes continuous casting, heating steel billet, controlled rolling, disk
Cooling process, the specific process steps are as follows:
1) continuous casting working procedure: realizing casting billet surface press quenching using cooling device three times in continuous casting process, slab before quenching
808 DEG C of temperature, 185 DEG C of casting blank surface temperature after quenching, quench flame layer thickness 22mm;Steel billet chemical component composition and quality percentage contain
Amount are as follows: 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: slab, which enters in heating furnace, is initially pre-heated to 1110 DEG C, is then heated to 1132 DEG C of heat preservations,
The total time 115min of slab in heating furnace, oxygen content 5% in furnace;
3) controlled rolling process: slab is into 930 DEG C of finishing mill temperature, into 870 DEG C of Laying head temperature;
4) wire rod cooling process: wire rod after process of spinning, all close by insulation cover, and cooling blower is all closed, and is put down
Equal roller table speed is 0.70m/s, and the natural air cooling on PF chain is coiled after collector.
Wire rod tissue and performance: wire rod specification Φ 9.0mm, hardness 83HRB, Widmannstatten structure < 1 grade is organized as ferrite+pearl
Body of light;In client's later period use process, 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 includes continuous casting, heating steel billet, controlled rolling, disk
Cooling process, the specific process steps are as follows:
1) continuous casting working procedure: realizing casting billet surface press quenching using cooling device three times in continuous casting process, slab before quenching
820 DEG C of temperature, 190 DEG C of casting blank surface temperature after quenching, quench flame layer thickness 21mm;Steel billet chemical component composition and quality percentage contain
Amount are as follows: 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: slab, which enters in heating furnace, is initially pre-heated to 1120 DEG C, is then heated to 1145 DEG C of heat preservations,
The total time 100min of slab in heating furnace, oxygen content 4% in furnace;
3) controlled rolling process: slab is into 930 DEG C of finishing mill temperature, into 890 DEG C of Laying head temperature;
4) wire rod cooling process: wire rod after process of spinning, all close by insulation cover, and cooling blower is all closed, and is put down
Equal roller table speed is 0.70m/s, and the natural air cooling on PF chain is coiled after collector.
Wire rod tissue and performance: wire rod specification Φ 6.0mm, hardness 86HRB, Widmannstatten structure < 1 grade is organized as ferrite+pearl
Body of light;In client's later period use process, 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 includes continuous casting, heating steel billet, controlled rolling, disk
Cooling process, the specific process steps are as follows:
1) continuous casting working procedure: realizing casting billet surface press quenching using cooling device three times in continuous casting process, slab before quenching
800 DEG C of temperature, 200 DEG C of casting blank surface temperature after quenching, quench flame layer thickness 25mm;Steel billet chemical component composition and quality percentage contain
Amount are as follows: 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: slab, which enters in heating furnace, is initially pre-heated to 1105 DEG C, is then heated to 1140 DEG C of heat preservations,
The total time 105min of slab in heating furnace, oxygen content 3% in furnace;
3) controlled rolling process: slab is into 925 DEG C of finishing mill temperature, into 885 DEG C of Laying head temperature;
4) wire rod cooling process: wire rod after process of spinning, all close by insulation cover, and cooling blower is all closed, and is put down
Equal roller table speed is 0.80m/s, and the natural air cooling on PF chain is coiled after collector.
Wire rod tissue and performance: wire rod specification Φ 5.5mm, hardness 90HRB, organize as ferrite+pearl by 1 grade of Widmannstatten structure
Body of light;In client's later period use process, 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
The difference of this comparative example and embodiment 1 is only that steel making working procedure: bosher three times is not used in casting billet surface after continuous casting
Skill, rolling process: into 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
The difference of this comparative example and embodiment 2 is only that steel making working procedure: bosher three times is not used in casting billet surface after continuous casting
Skill, rolling process: into 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
The difference of this comparative example and embodiment 3 is only that steel making working procedure: bosher three times is not used in casting billet surface after continuous casting
Skill, rolling process: into 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.
It can be seen that the medium carbon cold heading steel Widmannstatten structure grade of Fig. 1-6 application the method for the present invention production by comparing attached drawing 1-9
Not, content is significantly lower than Fig. 7-9;1 grade of Widmannstatten structure rank in Fig. 1-6, and there is only 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.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (9)
1. a kind of control method of medium carbon cold heading steel wire rod Widmannstatten structure, which is characterized in that the control method includes continuous casting, steel
Base heating, controlled rolling, wire rod cooling process;The continuous casting working procedure, gained continuous casting steel billet chemical component composition and quality percentage
Content are as follows: 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 continuous casting working procedure,
After continuous casting billet is aligned, casting billet surface press quenching, slab temperature >=800 DEG C before quenching, casting blank surface temperature after quenching≤
200℃。
2. a kind of control method of medium carbon cold heading steel wire rod Widmannstatten structure according to claim 1, which is characterized in that described
Continuous casting working procedure uses cooling device three times cutting front roller-way online, realizes that casting billet surface is quenched online after continuous casting billet aligning
Fire.
3. a kind of control method of medium carbon cold heading steel wire rod Widmannstatten structure according to claim 1, which is characterized in that described
Heating steel billet process, slab, which enters, is initially pre-heated to 1105-1120 DEG C in heating furnace, is then heated to 1130-1150 DEG C of heat preservation.
4. a kind of control method of medium carbon cold heading steel wire rod Widmannstatten structure according to claim 1, which is characterized in that described
Heating steel billet process, the total time≤120min of slab in heating furnace, oxygen content≤6% in furnace.
5. a kind of control method of medium carbon cold heading steel wire rod Widmannstatten structure according to claim 1, which is characterized in that described
Controlled rolling process, the temperature that slab enters finishing mill is 905-935 DEG C, and the temperature into Laying head is 870-890 DEG C.
6. a kind of control method of medium carbon cold heading steel wire rod Widmannstatten structure described in -5 any one according to claim 1, special
Sign is that the wire rod cooling process, insulation cover is all closed, and cooling blower is all closed, and average roller table speed is 0.30m/
S-1.0m/s coils the natural air cooling on PF chain after collector.
7. a kind of control method of medium carbon cold heading steel wire rod Widmannstatten structure described in -5 any one according to claim 1, special
Sign is, medium carbon cold heading steel wire rod hardness≤90HRB of the control method production, Widmannstatten structure≤1 grade;Tissue is ferrite
+ pearlite.
8. a kind of control method of medium carbon cold heading steel wire rod Widmannstatten structure described in -5 any one according to claim 1, special
Sign is that the medium carbon cold heading steel wire rod of the control method production is in later period use process, cold heading cracking rate≤3%.
9. a kind of control method of medium carbon cold heading steel wire rod Widmannstatten structure described in -5 any one according to claim 1, special
Sign is that the control method is suitable for the medium carbon cold heading steel wire rod that production specification is Φ 5.5-10mm.
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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 for medium-carbon chromium-bearing cold heading steel wire rod |
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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 for medium-carbon chromium-bearing cold heading steel wire rod |
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