CN109136757A - The production method of medium carbon cold heading steel wire rod and medium carbon cold heading steel wire rod - Google Patents
The production method of medium carbon cold heading steel wire rod and medium carbon cold heading steel wire rod Download PDFInfo
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- CN109136757A CN109136757A CN201811032105.XA CN201811032105A CN109136757A CN 109136757 A CN109136757 A CN 109136757A CN 201811032105 A CN201811032105 A CN 201811032105A CN 109136757 A CN109136757 A CN 109136757A
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- steel wire
- wire rod
- medium carbon
- cold heading
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
-
- 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
- B22D11/16—Controlling or regulating processes or operations
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- 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)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Metal Rolling (AREA)
Abstract
The present invention provides the production methods of a kind of medium carbon cold heading steel wire rod and medium carbon cold heading steel wire rod, wherein, medium carbon cold heading steel wire rod, by percentage to the quality, its chemical component are as follows: C 0.30-0.38%, Si 0.05-0.15%, Mn 0.40-0.50%, S≤0.02%, P≤0.02%, B 0.0010-0.0030%, RE 0.02~0.03%, remaining is Fe and inevitable impurity.According to the technical solution of the present invention, it can be in the case where the conventional high-speed rod appointed condition of heavily loaded reducing-sizing mill and shorter stelmor cooling be not configured, pass through the microelements such as addition RE, play the effect that rare earth element promotes the online nodularization of pearlite, realize microscopic structure fining and the Uniform Control, obtaining, there is the fine uniform ferrite of low work hardening capacity to add part nodularization Dispersed precipitate pearlitic structrure, and then cancel fastener drawing passes interval spheroidizing, simplify subsequent fastener manufacturing procedure.
Description
Technical field
The present invention relates to metallurgical technology fields, in particular to a kind of medium carbon cold heading steel wire rod and a kind of middle carbon cold-heading
The production method of steel wire rod.
Background technique
Cold-forging steel is because cold forming capability is good, and metal consumption is low when processing fastener with its cold-heading, and product size essence
Degree is high, and surface smoothness is good, and productivity is high.High-intensity fasteners will usually carry out the technique of " two draw one to move back " before cold upset forming
Processing, the i.e. technique of pickling, drawing, spheroidizing (or soft annealing) and redrawing.The purpose of " two draw one to move back " technique is to improve
The dimensional accuracy and surface smoothness of cold-heading blank, guarantee the cold heading performance of material, prevent the cracking in Cold Heading Process.It is high
Strength fastener final products generally will also can be only achieved performance rate requirement by modifier treatment.Pony-roughing pass soft annealing and
Modifier treatment can improve the processing performance and final structure property of fastener, but improve energy consumption, increase and be produced into
This, but also pollute the environment.
From the point of view of the development trend of cold-forging steel, being controlled by stocking structure property to simplify subsequent fastener manufacturing procedure is
One important direction, wherein exempting from annealed cold-forging steel belongs to typical energy saving environmental protection product.Exempt from annealed cold-forging steel to be omitted or simplified
The soft annealing at drawing passes interval, considerably simplifies production process before cold-heading, shortens the production cycle, reduces
Energy consumption, thus there is significant economic benefit and social benefit.
The high-speed rod-rolling mill equipped with heavily loaded reducing-sizing mill and long Stelmor cooling line is utilized both at home and abroad at present
Production line produces high intensity non-annealed Cold Heading Steel Wire.Its principle is by low temperature large deformation thermal mechanical rolling, in extreme deformation
Austenite grain boundary and intra-die form a large amount of dislocation and Zona transformans, control, obtain in conjunction with subsequent abundant annealing process phase transformation
Higher volume fraction and appropriate coarse grain ferrite, pearlite colony is small and scattered, and the cemetite lamellae in pearlite is thinning, becomes broken
And part-granular.Its hardness is reduced compared with conventional strand, and the contraction percentage of area improves, and cold-workability improves, and be can satisfy and is exempted to anneal
The requirement of cold-forging steel.But for conventional high rate rod-rolling mill, realize that the online soft annealing of cold-forging steel is more difficult.
103882304 A of publication No. CN discloses a kind of super-low-hardness and exempts from annealed cold-forging steel production method, parade one's wealth chemistry at
Point and heating temperature, start rolling temperature, final rolling temperature, the technology controlling and process such as weak cold technique and stelmor roller table speed, but should
Method is mainly for low-carbon cold-forging steel containing Ti-B.
105063481 A of publication No. CN disclose it is a kind of exempt from anneal boron-containing cold heading steel production method, including chemistry at
Divide, smelting, continuous casting, rolling mill practice, but this method is also mainly for low-carbon cold-forging steel containing Ti-B.
104593673 A of publication No. CN discloses a kind of middle carbon and exempts from annealed cold-forging steel gren rod and its production method, wraps
Chemical component adjustment is included, the control of TMCP technology reduces the final hardness of wire rod, accomplishes the product requirement for exempting from annealing.But it should
Method is realized under the conditions of having and subtracting sizing apparatus.
104988409 A of publication No. CN discloses one kind and exempts from annealed cold-forging steel gren rod and its production method, using normal
High-speed rod-rolling mill is advised, is designed by optimization of Chemical Composition, control heating temperature, into final rolling temperature, laying temperature and cooling
Degree controls ferrite content and ferrite grain size, realizes the production for exempting from annealed cold-forging steel gren rod, but this method pertains only to greatly
The production of billet continuous casting base, and it is still necessary to further improve with pearlite colony Dispersed precipitate for microscopic structure fining.
Summary of the invention
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
For this purpose, it is an object of the present invention to provide a kind of medium carbon cold heading steel wire rods.
It is another object of the present invention to provide a kind of production methods of medium carbon cold heading steel wire rod.
In view of this, the technical solution of first aspect present invention provides a kind of medium carbon cold heading steel wire rod, with quality percentage
Than meter, chemical component are as follows: C 0.30-0.38%, Si 0.05-0.15%, Mn 0.40-0.50%, S≤0.02%, P≤
0.02%, B 0.0010-0.0030%, RE 0.02~0.03%, remaining is Fe and inevitable impurity.
The technical solution of second aspect of the present invention proposes a kind of production method of medium carbon cold heading steel wire rod, for producing the
The medium carbon cold heading steel wire rod of the technical solution of one side, comprising: bloom continuous casting, cogging are heated, and are rolled, spinning, stelmor
Cooling line is cooling；Or continuous small-billet casting, cogging are heated, and are rolled, spinning, Stelmor cooling line is cooling.
Further, in the continuous casting working procedure, 15-25 DEG C of baotou steel water superheat in bloom process, pulling speed of continuous casting 0.60
~0.70m/min；25-30 DEG C of baotou steel water superheat in small billet process, pulling speed of continuous casting 1.8-2.0m/min.
Further, in the rolling process, 1050 DEG C of heating temperature, 950~1000 DEG C of start rolling temperature, pre- finish rolling entrance
950~990 DEG C of temperature, 800~860 DEG C of entry temperature at finishing.
Further, in the cooling process: 790~850 DEG C of laying temperature, 1# and 2# blower opens 30%~50%, protects
Temperature cover is all closed, and 700~750 DEG C of insulation cover inlet temperature, 600~680 DEG C of insulation cover outlet temperature, insulation cover section cooling rate
0.1~0.3 DEG C/s.
One or more technical solution provided in an embodiment of the present invention, has at least the following technical effects or advantages:
It can lead in the case where the conventional high-speed rod appointed condition of heavily loaded reducing-sizing mill and shorter stelmor cooling is not configured
It crosses the microelements such as addition RE, plays the effect that rare earth element promotes the online nodularization of pearlite, in conjunction with controlled rolling and online soft
Change and is segmented accurate Controlled cooling process, it is quick by water tank before spinning in mm finishing mill unit acceptable temperature range lower limit controlled rolling
Cooling, deformation energy storage heredity to subsequent Stelmor cooling line cooling phase-change process softens rule with online based on phase transformation law,
Phase transformation is accurately controlled in effective insulation cover slow cooling section, microscopic structure fining and the Uniform Control is realized, obtains with low
The fine uniform ferrite of work hardening capacity adds part nodularization Dispersed precipitate pearlitic structrure, and then cancels fastener drawing road
Minor tick spheroidizing simplifies subsequent fastener manufacturing procedure.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Fig. 1 is the microstructure picture of 1 hot rolling wire of embodiment；
Fig. 2 is the microstructure picture of 2 hot rolling wire of embodiment.
Specific embodiment
In order to be more clearly understood that aforementioned aspect of the present invention, feature and advantage, With reference to embodiment
The present invention is further described in detail.It should be noted that in the absence of conflict, embodiments herein and reality
The feature applied in example can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
The medium carbon cold heading steel wire rod of embodiment according to the present invention, by percentage to the quality, chemical component are as follows: C
0.30-0.38%, Si 0.05-0.15%, Mn 0.40-0.50%, S≤0.02%, P≤0.02%, B 0.0010-
0.0030%, RE 0.02~0.03%, remaining is Fe and inevitable impurity.
The production method of the medium carbon cold heading steel wire rod of embodiment according to the present invention, comprising: bloom continuous casting, cogging add
Heat rolls, spinning, and Stelmor cooling line is cooling；Or continuous small-billet casting, cogging are heated, and are rolled, spinning, stelmor cooling
Line is cooling.
Further, in the smelting process, be added one of ferrosilicon, silicomanganese, anthracite and aluminium silicon titanium or it is a variety of into
Row deoxidation alloying；Tapping process carries out BOTTOM ARGON BLOWING operation to ladle.
Further, in the refining process, ferrosilicon, mid-carbon fe-mn is added and is calcined one or more progress in anthracite
Trimming；Refine later period addition VN alloy；The soft blow time is greater than 10min.
Further, in the operation of rolling, Φ 8mm reinforcing bar laying temperature is 970~990 DEG C；The spinning of Φ 10mm reinforcing bar
Temperature is 940~960 DEG C；Φ 12mm reinforcing bar laying temperature is 920~940 DEG C；Φ 14mm reinforcing bar laying temperature is 890~910
℃。
Further, in the cooling process: 790~850 DEG C of laying temperature, 1# and 2# blower opens 30%~50%, protects
Temperature cover is all closed, and 700~750 DEG C of insulation cover inlet temperature, 600~680 DEG C of insulation cover outlet temperature, insulation cover section cooling rate
0.1~0.3 DEG C/s.
It can lead in the case where the conventional high-speed rod appointed condition of heavily loaded reducing-sizing mill and shorter stelmor cooling is not configured
It crosses the microelements such as addition RE, plays the effect that rare earth element promotes the online nodularization of pearlite, in conjunction with controlled rolling and online soft
Change and is segmented accurate Controlled cooling process, it is quick by water tank before spinning in mm finishing mill unit acceptable temperature range lower limit controlled rolling
Cooling, deformation energy storage heredity to subsequent Stelmor cooling line cooling phase-change process softens rule with online based on phase transformation law,
Phase transformation is accurately controlled in effective insulation cover slow cooling section, microscopic structure fining and the Uniform Control is realized, obtains with low
The fine uniform ferrite of work hardening capacity adds part nodularization Dispersed precipitate pearlitic structrure, and then cancels fastener drawing road
Minor tick spheroidizing simplifies subsequent fastener manufacturing procedure.
Specific embodiment
Embodiment 1:
A kind of microalloying of rare earth exempts from anneal medium carbon cold heading steel wire rod and its production technology, and chemical component presses quality percentage
Number includes: C 0.33%, Si 0.13%, Mn 0.46%, S 0.003%, P 0.007%, B 0.0028%, RE additional amount
0.03%, remaining is Fe and inevitable impurity.
A kind of microalloying of rare earth exempts to anneal medium carbon cold heading steel wire rod and its production technology, process flow include: small side
Base continuous casting, heating, rolling, spinning and Stelmor cooling line are cooling.
In the continuous casting working procedure, 26 DEG C of middle baotou steel water superheat, continuous small-billet casting pulling rate 2.0m/min.
In the rolling process, 1050 DEG C of heating temperature, 965 DEG C of start rolling temperature, 960 DEG C of pre- entry temperature at finishing, finish rolling
840 DEG C of inlet temperature.Finished wire rod specification Φ 10.
In the cooling process: 840 DEG C of laying temperature, 1# and 2# blower opens 50%, and insulation cover is all closed, and insulation cover enters
750 DEG C of temperature of mouth, 600~680 DEG C of insulation cover outlet temperature, insulation cover section 0.1~0.3 DEG C/s of cooling rate.
Mentioned component and technique is used to obtain microscopic structure as Dispersed precipitate pearlite on the ferrite matrix of fine uniform
Pelletizing, about 10.5 μm of polygonal ferrite average grain size, in cross section ferrite grain size level difference 0.5 grade with
It is interior, pearlite volume fraction 39%.Tensile strength 543MPa, elongation 33.0%, reduction of area 55.0%, hardness 80.5HRB.Tool
There is the matching of low-intensity, soft and good plasticity, can satisfy 8.8 grades of fasteners and exempt from processing performance requirement of annealing.Hot Line
The microstructure picture of material is as shown in Figure 1.
Embodiment 2:
A kind of microalloying of rare earth exempts from anneal medium carbon cold heading steel wire rod and its production technology, and chemical component presses quality percentage
Number includes: C 0.34%, Si 0.12%, Mn 0.50%, S 0.006%, P 0.012%, B 0.0032%, RE additional amount
0.02%, remaining is Fe and inevitable impurity.
A kind of microalloying of rare earth exempts to anneal medium carbon cold heading steel wire rod and its production technology, process flow include: generous
Base continuous casting, cogging, heating, rolling, spinning and Stelmor cooling line are cooling.
In the continuous casting working procedure, 24 DEG C of middle baotou steel water superheat, continuous small-billet casting pulling rate 0.65m/min.
In the rolling process, 1050 DEG C of heating temperature, 970 DEG C of start rolling temperature, 960 DEG C of pre- entry temperature at finishing, finish rolling
850 DEG C of inlet temperature.Finished wire rod specification Φ 10.
In the cooling process: 820 DEG C of laying temperature, 1# and 2# blower opens 30%, and insulation cover is all closed, and insulation cover enters
750 DEG C of temperature of mouth, 600~680 DEG C of insulation cover outlet temperature, insulation cover section 0.1~0.3 DEG C/s of cooling rate.
Mentioned component and technique is used to obtain microscopic structure as Dispersed precipitate pearlite on the ferrite matrix of fine uniform
Pelletizing, about 11.0 μm of polygonal ferrite average grain size, in cross section ferrite grain size level difference 0.5 grade with
It is interior, pearlite volume fraction 40%.Tensile strength 537MPa, elongation 33.0%, reduction of area 57.0%, hardness 80.8HRB.Tool
There is the matching of low-intensity, soft and good plasticity, can satisfy 8.8 grades of fasteners and exempt from processing performance requirement of annealing.Hot Line
The microstructure picture of material is as shown in Figure 2.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one reality of the invention
It applies in example or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment or reality
Example.Moreover, description particular features, structures, materials, or characteristics can in any one or more of the embodiments or examples with
Suitable mode combines.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of medium carbon cold heading steel wire rod, which is characterized in that by percentage to the quality, chemical component are as follows: C 0.30-
0.38%, Si 0.05-0.15%, Mn 0.40-0.50%, S≤0.02%, P≤0.02%, B 0.0010-0.0030%, RE
0.02~0.03%, remaining is Fe and inevitable impurity.
2. a kind of production method of medium carbon cold heading steel wire rod, for producing medium carbon cold heading steel wire rod as described in claim 1,
It is characterized in that, comprising:
Bloom continuous casting, cogging are heated, and are rolled, spinning, and Stelmor cooling line is cooling；Or
Continuous small-billet casting, cogging are heated, and are rolled, spinning, and Stelmor cooling line is cooling.
3. the production method of medium carbon cold heading steel wire rod according to claim 2, which is characterized in that in the continuous casting working procedure,
15-25 DEG C of baotou steel water superheat in bloom process, 0.60~0.70m/min of pulling speed of continuous casting；Baogang's water mistake in small billet process
25-30 DEG C of temperature, pulling speed of continuous casting 1.8-2.0m/min.
4. the production method of medium carbon cold heading steel wire rod according to claim 2, which is characterized in that in the rolling process,
1050 DEG C of heating temperature, 950~1000 DEG C of start rolling temperature, 950~990 DEG C of pre- entry temperature at finishing, entry temperature at finishing 800~
860℃。
5. the production method of medium carbon cold heading steel wire rod according to claim 2, which is characterized in that in the cooling process:
790~850 DEG C of laying temperature, 1# and 2# blower opens 30%~50%, and insulation cover is all closed, and insulation cover inlet temperature 700~
750 DEG C, 600~680 DEG C of insulation cover outlet temperature, insulation cover section 0.1~0.3 DEG C/s of cooling rate.
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| CN201811032105.XA CN109136757B (en) | 2018-09-05 | 2018-09-05 | Production method of medium-carbon cold heading steel wire and medium-carbon cold heading steel wire |
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| CN201811032105.XA CN109136757B (en) | 2018-09-05 | 2018-09-05 | Production method of medium-carbon cold heading steel wire and medium-carbon cold heading steel wire |
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| CN109136757B CN109136757B (en) | 2020-10-27 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114058956A (en) * | 2021-10-28 | 2022-02-18 | 马鞍山钢铁股份有限公司 | 4.8-grade corrosion-resistant cold forging steel and production method thereof |
| CN116065099A (en) * | 2023-01-03 | 2023-05-05 | 包头钢铁（集团）有限责任公司 | Annealing-free cold heading steel wire rod and production process thereof |
| CN117512468A (en) * | 2023-12-29 | 2024-02-06 | 山西建龙实业有限公司 | ML35TiB-M cold heading steel for annealing-free high-strength fastener and preparation method thereof |
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