CN106929662B - A kind of continuous annealing method of hot press-formed steel - Google Patents
A kind of continuous annealing method of hot press-formed steel Download PDFInfo
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- CN106929662B CN106929662B CN201710031679.4A CN201710031679A CN106929662B CN 106929662 B CN106929662 B CN 106929662B CN 201710031679 A CN201710031679 A CN 201710031679A CN 106929662 B CN106929662 B CN 106929662B
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
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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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- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention discloses a kind of continuous annealing methods of hot press-formed steel comprising annealing and smooth process；The annealing operation: equal 780~800 DEG C of temperature of temperature section, 670~690 DEG C of rapid cooling start temperature, 390~410 DEG C of rapid cooling final temperature, 360~380 DEG C of lapse of time temperature, cold section 140~160 DEG C of temperature of end eventually, 43~50 DEG C of temperature after water quenching.This method is produced using continuous annealing method, and production efficiency is higher；Al-Si coating design is not used, and production cost is low；Using production technologies such as reasonable heating temperature, speeds of production, the dew point in furnace is cooperated to produce product, improves the combination fastness that subsequent thermal is stamped and formed out iron scale and matrix；Using reasonable flattening process, cooperate the work roll for temper mill of certain roughness, control the surface roughness of strip, improves the combination fastness that subsequent thermal is stamped and formed out iron scale and matrix.Iron scale using the hot press-formed product of this method production is not easily to fall off, and the firmness in conjunction with matrix is good.
Description
Technical field
The present invention relates to a kind of heat treatment method of unimach, especially a kind of continuous annealing of hot press-formed steel
Method.
Background technique
A kind of important channel of automobile lightweight is using unimach, but with the raising of its intensity, steel plate
Forming property significantly reduces, and direct handling ease generates cracking, and hot press-formed technique has well solved this problem.Heat
Process for stamping and forming is to combine the Plastic Forming of steel plate and heat treatment, dedicated for shaping the first system of superhigh intensity boron steel
Technology is made, intensity can be made to reach 1500MPa using heat forming technology manufacture auto parts and components.
General hot press-formed technique are as follows: be heated rapidly to 900 DEG C or so → → feeding to stamping station → punching of coming out of the stove
Press and cool down → demoulding (about 200 DEG C) → to be air-cooled to room temperature.In heat forming processes, workpiece works under the high temperature conditions, surface
Iron and alloying element react to form oxidation film with oxygen, the moisture etc. in air dielectric, oxidation film in heat forming processes be easy
It falls off.Adverse effect caused by it mainly has: 1) forming abrasive wear between mold and workpiece, influence the precision of workpiece and outer
It sees；2) mold is caused to wear, reduces die life；3) it induces workpiece body to crack to form formation of crack, keeps workpiece latent
Hidden danger of quality；4) heat transfer and heating conduction are affected, to influence workpiece body phase transition process.
This can effectively be solved the problems, such as using the steel plate of the coating containing Al-Si, make surface of steel plate that there is good anti-oxidant energy
Power, but its manufacturing cost is higher compared with without coated steel sheet.And not band coating cold-rolled steel sheet mostly uses cover annealing method to produce at present,
Its surface film oxide is not easily to fall off but production efficiency is lower.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of continuous annealing sides of the hot press-formed steel of high production efficiency
Method.
In order to solve the above technical problems, the technical solution used in the present invention is: it includes annealing and smooth process；It is described
Annealing operation: equal 780~800 DEG C of temperature of temperature section, 670~690 DEG C of rapid cooling start temperature, 390~410 DEG C of rapid cooling final temperature,
360~380 DEG C of lapse of time temperature, cold section 140~160 DEG C of temperature of end eventually, 43~50 DEG C of temperature after water quenching.
In annealing operation of the present invention, ease up cold section of dew point value of bringing-up section, equal temperature section is controlled+5 DEG C~+20
℃。
Smooth process of the present invention: smooth elongation percentage setting value is 0.8 × d%~1.2 × d%, and wherein d is steel band millimeter
Thickness value；Roll-force control range is 4000~8000KN, and the roughness of work roll for temper mill is 3.0~4.0um.
The beneficial effects of adopting the technical scheme are that the present invention is produced using continuous annealing method, relative to current
Method, that is, cover annealing method production efficiency that mainstream produces drop stamping steel is higher；The present invention does not use Al-Si coating design, production cost
It is low；The present invention cooperates the dew point in furnace to produce product, after raising using production technologies such as reasonable heating temperature, speeds of production
Continuous drop stamping forms the combination fastness of iron scale and matrix；The present invention uses reasonable flattening process, and cooperation is certain coarse
The work roll for temper mill of degree controls the surface roughness of strip, improves the combination jail that subsequent thermal is stamped and formed out iron scale and matrix
Soundness.Iron scale using hot press-formed product produced by the invention is not easily to fall off, and the firmness in conjunction with matrix is good.
Therefore, the present invention has the characteristics that high production efficiency, continuous production, overall cost are low, and the product of production is through hot press-formed
Function admirable and product oxidation film in heat forming processes is not easily to fall off after processing has good application.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is continuous annealing process signal schematic diagram of the invention；
Fig. 2 is the poly- degree figure of analysis of steel strip surface Mn, Si element under high dew point and low dew point conditions；
Fig. 3 is the smoother iron scale pattern schematic diagram in interface；
Fig. 4 is anchor-shaped iron scale pattern schematic diagram；
Fig. 5 is the surface condition photo of hot press-formed product obtained by conventional method；
Fig. 6 is the surface condition photo of hot press-formed product obtained by this method.
Specific embodiment
The continuous annealing method of this hot press-formed steel uses following technical process:
(1) mass fraction of the hot press-formed steel band chemical component produced are as follows: C 0.21~0.25%, Mn 1.30~
1.50%, Si 0.18~0.35%, S≤0.006%, P≤0.022%, Al 0.030~0.050%, Cr 0.10~0.50%, B
0.002~0.005%, surplus is iron and inevitable impurity.
(2) annealing operation: vertical continuous annealing furnace is used, entire annealing furnace is by preheating section, bringing-up section, soaking zone, slow cooling
Section, rapid cooling section, overaging section, eventually cold section and water quenching equipment composition.
A, each section of temperature control system are as follows: as shown in Figure 1,780~800 DEG C of temperature of temperature section, rapid cooling start temperature 670~
690 DEG C, 390~410 DEG C of rapid cooling final temperature, 360~380 DEG C of lapse of time temperature, cold section 140~160 DEG C of temperature of end eventually,
43~50 DEG C of temperature after water quenching.The thickness range for producing product is 1.0~2.5mm, and process speed is 80~100m/min, foundation
Product thickness adjusting process speed guarantees that steel band performance is qualified and uniform.
B, dew point technique: the gaseous mixture station hydrogen content setting 4% of annealing furnace, furnace pressure is set as 1.2mbar；Using slow cooling section
Humidifying mode improves dew point value, and adjustment bringing-up section furnace roof release aperture control dew point improves speed, aperture generally 10~60%,
To guarantee bringing-up section, equal temperature section, slow cooling section dew point value between+5 DEG C to+20 DEG C.
It is examined using content distribution of the aura spectrometer to high dew point and steel strip surface Mn, Si element under low dew point conditions
It surveys, the poly- degree of analysis of surface Mn, Si element is as shown in Fig. 2, the surface (Gao Ludian) Mn, Si element under wet atmosphere as seen from Figure 2
It analyses that poly- degree is higher, advantageously forms complicated oxidation phase structure, to the iron scale and matrix for improving subsequent hot forming and being formed
Firmness it is advantageous.
This method cooperates the dew point in furnace using production technologies such as reasonable heating temperature, speeds of production, and control strip is close
The poly- degree of the analysis of surface-element.The analysis of near surface element is poly- to influence iron scale that subsequent hot forming is formed at being grouped as, complicated
Oxidation phase structure improve the combination fastness of oxide and matrix, there is the rising of anchor-shaped iron scale pattern probability.Steel plate
Surface difference iron scale pattern schematic diagram is as shown in Figure 3, Figure 4.
(3) smooth process: using permanent elongation control mode, smooth elongation percentage setting value is 0.8 × d%~1.2 × d%,
Wherein d is thickness of strips value (unit is millimeter)；Roll-force control range is 4000~8000KN, is prolonged with reaching the smooth of setting
The rate value of stretching is suitable；The roughness of work roll for temper mill is 3.0~4.0um.This method uses reasonable flattening process, and cooperation is certain
The work roll for temper mill of roughness controls the surface roughness of strip.The subsequent hot forming of the surface roughness affect of strip is formed
The structure and pattern of iron scale, roughness value is big, and number of peaks is more in unit length, anchor-shaped iron scale pattern probability occurs
Rise.
Fig. 5, shown in 6, after above-mentioned technique, the iron scale of the hot press-formed product of gained is not easily to fall off, with matrix
In conjunction with firmness it is good.
Embodiment 1: the concrete technology of the continuous annealing method of this hot press-formed steel is as described below.
The mass fraction of the hot press-formed steel chemical composition are as follows: C 0.21%, Mn 1.40%, Si 0.30%, S
0.006%, P 0.015%, Al 0.035%, Cr 0.20%, B 0.002%, remaining is iron and inevitable impurity.
Continuous annealing process are as follows: 1) annealing operation: equal 780 DEG C of temperature of temperature section, 680 DEG C of rapid cooling start temperature, rapid cooling terminates
390 DEG C of temperature, 360 DEG C of lapse of time temperature, cold section 150 DEG C of temperature of end eventually, 43 DEG C of temperature after water quenching.Process speed is
100m/min.Dew point value is respectively+14 DEG C of bringing-up section ,+15 DEG C of equal temperature section ,+16 DEG C of slow cooling section.
2) smooth process: smooth elongation percentage be 1.2%, roll-force 6000KN, product with a thickness of 1.0mm, finishing operations
The roughness of roller is 3.0um.
Performance after the hot press-formed steel continuous annealing are as follows: tensile strength 642MPa, yield strength 450MPa,
Elongation percentage A80mm is 21%.Performance after hot press-formed again are as follows: tensile strength is 1665 MPa, and elongation percentage A50mm is 6%, full
Sufficient customer requirement；Iron scale firmness is good after hot press-formed.
Embodiment 2: the concrete technology of the continuous annealing method of this hot press-formed steel is as described below.
The mass fraction of the hot press-formed steel chemical composition are as follows: C 0.22%, Mn 1.30%, Si 0.35%, S
0.006%, P 0.020%, Al 0.030%, Cr 0.50%, B 0.005%, remaining is iron and inevitable impurity.
Continuous annealing process are as follows: 1) annealing operation: equal 790 DEG C of temperature of temperature section, 670 DEG C of rapid cooling start temperature, rapid cooling terminates
400 DEG C of temperature, 370 DEG C of lapse of time temperature, cold section 160 DEG C of temperature of end eventually, temperature 45 C after water quenching.Process speed is 95m/
min.Dew point value is respectively+19 DEG C of bringing-up section ,+19 DEG C of equal temperature section ,+20 DEG C of slow cooling section.
2) smooth process: smooth elongation percentage be 1.5%, roll-force 8000KN, product with a thickness of 1.5mm, finishing operations
The roughness of roller is 4.0um.
Performance after the hot press-formed steel continuous annealing are as follows: tensile strength 661MPa, yield strength 473MPa,
Elongation percentage A80mm is 20%.Performance after hot press-formed again are as follows: tensile strength is 1610 MPa, and elongation percentage A50mm is 6.5%,
Meet customer requirement；Iron scale firmness is good after hot press-formed.
Embodiment 3: the concrete technology of the continuous annealing method of this hot press-formed steel is as described below.
The mass fraction of the hot press-formed steel chemical composition are as follows: C 0.25%, Mn 1.40%, Si 0.18%, S
0.005%, P 0.022%, Al 0.050%, Cr 0.30%, B 0.003%, remaining is iron and inevitable impurity.
Continuous annealing process are as follows: 1) annealing operation: equal 800 DEG C of temperature of temperature section, 690 DEG C of rapid cooling start temperature, rapid cooling terminates
410 DEG C of temperature, 380 DEG C of lapse of time temperature, cold section 150 DEG C of temperature of end eventually, temperature 50 C after water quenching.Process speed is 80m/
min.Dew point value is respectively+12 DEG C of bringing-up section ,+13 DEG C of equal temperature section ,+15 DEG C of slow cooling section.
2) smooth process: smooth elongation percentage be 2.0%, roll-force 7000KN, product with a thickness of 2.5mm, finishing operations
The roughness of roller is 3.5um.
Performance after the hot press-formed steel continuous annealing are as follows: tensile strength 628MPa, yield strength 443MPa,
Elongation percentage A80mm is 20.5%.Performance after hot press-formed again are as follows: tensile strength 1605MPa, elongation percentage A50mm are
6.5%, meet customer requirement；Iron scale firmness is good after hot press-formed.
Embodiment 4: the concrete technology of the continuous annealing method of this hot press-formed steel is as described below.
The mass fraction of the hot press-formed steel chemical composition are as follows: C 0.23%, Mn 1.50%, Si 0.28%, S
0.005%, P 0.018%, Al 0.035%, Cr 0.10%, B 0.004%, remaining is iron and inevitable impurity.
Continuous annealing process are as follows: 1) annealing operation: equal 800 DEG C of temperature of temperature section, 680 DEG C of rapid cooling start temperature, rapid cooling terminates
400 DEG C of temperature, 370 DEG C of lapse of time temperature, cold section 140 DEG C of temperature of end eventually, temperature 45 C after water quenching.Process speed is 85m/
min.Dew point value is respectively+12 DEG C of bringing-up section ,+13 DEG C of equal temperature section ,+15 DEG C of slow cooling section.
2) smooth process: smooth elongation percentage be 2.0%, roll-force 4000KN, product with a thickness of 2.0mm, finishing operations
The roughness of roller is 3.0um.
Performance after the hot press-formed steel continuous annealing are as follows: tensile strength 637MPa, yield strength 440MPa,
Elongation percentage A80mm is 21%.Performance after hot press-formed again are as follows: tensile strength 1655MPa, elongation percentage A50mm are 5.5%,
Meet customer requirement；Iron scale firmness is good after hot press-formed.
Embodiment 5: the concrete technology of the continuous annealing method of this hot press-formed steel is as described below.
The mass fraction of the hot press-formed steel chemical composition are as follows: C 0.22%, Mn 1.40%, Si 0.25%, S
0.005%, P 0.019%, Al 0.038%, Cr 0.35%, B 0.003%, remaining is iron and inevitable impurity.
Continuous annealing process are as follows: 1) annealing operation: equal 800 DEG C of temperature of temperature section, 680 DEG C of rapid cooling start temperature, rapid cooling terminates
410 DEG C of temperature, 375 DEG C of lapse of time temperature, cold section 145 DEG C of temperature of end eventually, 43 DEG C of temperature after water quenching.Process speed is 87m/
min.Dew point value is respectively+5 DEG C of bringing-up section ,+10 DEG C of equal temperature section ,+13 DEG C of slow cooling section.
2) smooth process: smooth elongation percentage be 1.8%, roll-force 5000KN, product with a thickness of 1.8mm, finishing operations
The roughness of roller is 4.0um.
Performance after the hot press-formed steel continuous annealing are as follows: tensile strength 659MPa, yield strength 459MPa,
Elongation percentage A80mm is 19.5%.Performance after hot press-formed again are as follows: tensile strength 1544MPa, elongation percentage A50mm are
6.0%, meet customer requirement；Iron scale firmness is good after hot press-formed.
Claims (2)
1. a kind of continuous annealing method of hot press-formed steel, it is characterised in that: it includes annealing and smooth process；The annealing
Process: equal 780~800 DEG C of temperature of temperature section, 670~690 DEG C of rapid cooling start temperature, 390~410 DEG C of rapid cooling final temperature, timeliness
360~380 DEG C of final temperature, cold section 140~160 DEG C of temperature of end eventually, 43~50 DEG C of temperature after water quenching；The annealing operation
In, ease up cold section of dew point value of bringing-up section, equal temperature section is controlled at+5 DEG C~+20 DEG C；
The mass fraction of hot press-formed steel chemical composition are as follows: C 0.21~0.25%, Mn 1.30~1.50%, Si 0.18~
0.35%, S≤0.006%, P≤0.022%, Al 0.030~0.050%, Cr 0.10~0.50%, B 0.002~0.005%, it is remaining
Amount is iron and inevitable impurity.
2. the continuous annealing method of hot press-formed steel according to claim 1, which is characterized in that the smooth process:
Smooth elongation percentage setting value is 0.8 × d%~1.2 × d%, and wherein d is steel band millimeters thick angle value；Roll-force control range is 4000
~8000KN, the roughness of work roll for temper mill are 3.0~4.0um.
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| CN101812578A (en) * | 2009-02-25 | 2010-08-25 | 宝山钢铁股份有限公司 | Flexible strip processing line suitable for producing various high-strength steel |
| CN102212745A (en) * | 2011-06-03 | 2011-10-12 | 首钢总公司 | High-plasticity 780MPa-level cold rolled dual-phase steel and preparation method thereof |
| CN102304665A (en) * | 2011-09-21 | 2012-01-04 | 首钢总公司 | Steel plate for automobile and production method thereof |
| CN104714519A (en) * | 2014-12-30 | 2015-06-17 | 东北大学 | Method for setting and online optimizing technological parameters of production process of continuous annealing unit |
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- 2017-01-17 CN CN201710031679.4A patent/CN106929662B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101812578A (en) * | 2009-02-25 | 2010-08-25 | 宝山钢铁股份有限公司 | Flexible strip processing line suitable for producing various high-strength steel |
| CN102212745A (en) * | 2011-06-03 | 2011-10-12 | 首钢总公司 | High-plasticity 780MPa-level cold rolled dual-phase steel and preparation method thereof |
| CN102304665A (en) * | 2011-09-21 | 2012-01-04 | 首钢总公司 | Steel plate for automobile and production method thereof |
| CN104714519A (en) * | 2014-12-30 | 2015-06-17 | 东北大学 | Method for setting and online optimizing technological parameters of production process of continuous annealing unit |
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