CN106929662A - 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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- CN106929662A CN106929662A CN201710031679.4A CN201710031679A CN106929662A CN 106929662 A CN106929662 A CN 106929662A CN 201710031679 A CN201710031679 A CN 201710031679A CN 106929662 A CN106929662 A CN 106929662A
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- temperature
- hot press
- section
- continuous annealing
- rapid 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
- 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
-
- 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
Abstract
The invention discloses a kind of continuous annealing method of hot press-formed steel, it includes annealing and smooth operation；The annealing operation：Equal 780~800 DEG C of temperature section temperature, 670~690 DEG C of rapid cooling started temperature, 390~410 DEG C of rapid cooling final temperature, 360~380 DEG C of lapse of time temperature, whole cold section of 140~160 DEG C of end temp, 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 designs, low production cost are not used；Using production technologies such as rational heating-up temperature, speeds of production, coordinate the dew point production product in stove, improve the degree of being firmly combined with that subsequent thermal is stamped and formed out iron scale and matrix；Using rational flattening process, coordinate the work roll for temper mill of certain roughness, control the surface roughness of strip, improve the degree of being firmly combined with that subsequent thermal is stamped and formed out iron scale and matrix.The iron scale of the hot press-formed product produced using this method is difficult for drop-off, and the firmness combined 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 technology
A kind of important channel of automobile lightweight is to use unimach, but with the raising of its intensity, steel plate
Forming property is significantly reduced, and direct handling ease produces cracking, and hot press-formed technique solves this problem well.Heat
Process for stamping and forming is to be combined the Plastic Forming and heat treatment of steel plate, dedicated for shaping the first system of superhigh intensity boron steel
Technology is made, using heat forming technology manufacture auto parts and components intensity can be made to reach 1500MPa.
General hot press-formed technique is：It is heated rapidly to 900 DEG C or so → → feeding to stamping station → punching of coming out of the stove
Press and cool down the → demoulding（About 200 DEG C）→ it is air cooled to room temperature.In heat forming processes, workpiece works under the high temperature conditions, surface
Iron and alloying element and air dielectric in the reaction such as oxygen, moisture form oxide-film, oxide-film in heat forming processes easily
Come off.Its adverse effect for causing mainly has：1）Form abrasive wear between mould and workpiece, influence the precision of workpiece and outer
See；2）Abrasion is caused to mould, die life is reduced；3）Induce workpiece body to ftracture to form formation of crack, workpiece is hidden
Hidden danger of quality；4）Heat transfer and heat conductivility are have impact on, so as to influence workpiece body phase transition process.
This problem can effectively be solved using the steel plate containing Al-Si coating, 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 produced using cover annealing method more than current not band coating cold-rolled steel sheet,
Its surface film oxide is difficult for drop-off but production efficiency is relatively low.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of continuous annealing side of production efficiency hot press-formed steel high
Method.
In order to solve the above technical problems, the technical solution used in the present invention is：It includes annealing and smooth operation；It is described
Annealing operation：Equal 780~800 DEG C of temperature section temperature, 670~690 DEG C of rapid cooling started temperature, 390~410 DEG C of rapid cooling final temperature,
360~380 DEG C of lapse of time temperature, whole cold section of 140~160 DEG C of end temp, 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 operation 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.
It is using the beneficial effect produced by above-mentioned technical proposal：The present invention is produced using continuous annealing method, relative to current
The method of main flow production drop stamping steel is that cover annealing method production efficiency is higher；The present invention does not use Al-Si coating designs, production cost
It is low；The present invention coordinates the dew point production product in stove, after raising using production technologies such as rational heating-up temperature, speeds of production
Continuous drop stamping forms the degree of being firmly combined with of iron scale and matrix；The present invention uses rational flattening process, coordinates 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 the hot press-formed product of present invention production is difficult for drop-off, and the firmness combined with matrix is good.
Therefore, the characteristics of present invention has production efficiency high, continuous prodution, low integrated cost, the product of production is through hot press-formed
Function admirable and product oxide-film in heat forming processes is difficult for drop-off after processing, with good application.
Brief description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 is that continuous annealing process of the invention illustrates schematic diagram；
Fig. 2 is dew point high and the poly- degree figure of the analysis of steel strip surface Mn, Si element under 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 the conventional method hot press-formed product of gained；
Fig. 6 is the surface condition photo of this method hot press-formed product of gained.
Specific embodiment
The continuous annealing method of this hot press-formed steel uses following technical process：
（1）The mass fraction of hot press-formed steel band chemical composition of production is：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%, balance of iron and inevitable impurity.
（2）Annealing operation：Using vertical continuous annealing furnace, whole annealing furnace is by preheating section, bringing-up section, soaking zone, slow cooling
Section, rapid cooling section, eventually overaging section, cold section and water quenching equipment composition.
A, each section of temperature control system are：As shown in figure 1, equal 780~800 DEG C of temperature section temperature, rapid cooling started temperature 670~
690 DEG C, 390~410 DEG C of rapid cooling final temperature, 360~380 DEG C of lapse of time temperature, whole cold section of 140~160 DEG C of end temp,
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, it is ensured that steel band performance is qualified and uniform.
B, dew point technique：The gaseous mixture station hydrogen content of annealing furnace sets 4%, and furnace pressure is set as 1.2mbar；Using slow cooling section
Humidifying mode improve dew point value, adjustment bringing-up section furnace roof diffuse aperture control dew point improve speed, aperture typically 10~60%,
So as to ensure bringing-up section, equal temperature section, slow cooling section dew point value between+5 DEG C to+20 DEG C.
Dew point high is examined with the content distribution of steel strip surface Mn, Si element under low dew point conditions using aura spectrometer
Survey, the poly- degree of analysis of surface Mn, Si element is as shown in Fig. 2 as seen from Figure 2 under wet atmosphere（Dew point high）Surface Mn, Si element
Analyse that poly- degree is higher, advantageously form the oxidation phase structure of complexity, to improving iron scale and matrix that follow-up hot forming is formed
Firmness it is favourable.
This method coordinates the dew point in stove using production technologies such as rational heating-up temperature, speeds of production, and control strip is near
The poly- degree of analysis of surface-element.The iron scale that the poly- follow-up hot forming of influence of analysis of near surface element is formed is complicated into being grouped into
Oxidation phase structure improve the degree of being firmly combined with of oxide and matrix, there is the rising of anchor-shaped iron scale pattern probability.Steel plate
The different iron scale pattern schematic diagrames in surface are as shown in Figure 3, Figure 4.
（3）Smooth operation：Using permanent elongation control pattern, 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 rational flattening process, coordinates certain
The work roll for temper mill of roughness, controls the surface roughness of strip.What the follow-up hot forming of surface roughness affect of strip was formed
The structure and pattern of iron scale, roughness value are 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 difficult for drop-off, with matrix
With reference to 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 is：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 is：1）Annealing operation：Equal 780 DEG C of temperature section temperature, 680 DEG C of rapid cooling started temperature, rapid cooling terminates
390 DEG C of temperature, 360 DEG C of lapse of time temperature, whole cold section of 150 DEG C of end temp, 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 operation：Smooth elongation percentage is 1.2%, and roll-force is 6000KN, and the thickness of product is 1.0mm, finishing operations
The roughness of roller is 3.0um.
Performance after the hot press-formed steel continuous annealing is：Tensile strength is 642MPa, and yield strength is 450MPa,
Elongation percentage A80mm is 21%.Performance after hot press-formed again is：Tensile strength is 1665 MPa, and elongation percentage A50mm is 6%, full
Sufficient customer requirement；Hot press-formed rear oxidation iron sheet firmness is good.
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 is：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 is：1）Annealing operation：Equal 790 DEG C of temperature section temperature, 670 DEG C of rapid cooling started temperature, rapid cooling terminates
400 DEG C of temperature, 370 DEG C of lapse of time temperature, whole cold section of 160 DEG C of end temp, 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 operation：Smooth elongation percentage is 1.5%, and roll-force is 8000KN, and the thickness of product is 1.5mm, finishing operations
The roughness of roller is 4.0um.
Performance after the hot press-formed steel continuous annealing is：Tensile strength is 661MPa, and yield strength is 473MPa,
Elongation percentage A80mm is 20%.Performance after hot press-formed again is：Tensile strength is 1610 MPa, and elongation percentage A50mm is 6.5%,
Meet customer requirement；Hot press-formed rear oxidation iron sheet firmness is good.
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 is：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 is：1）Annealing operation：Equal 800 DEG C of temperature section temperature, 690 DEG C of rapid cooling started temperature, rapid cooling terminates
410 DEG C of temperature, 380 DEG C of lapse of time temperature, whole cold section of 150 DEG C of end temp, 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 operation：Smooth elongation percentage is 2.0%, and roll-force is 7000KN, and the thickness of product is 2.5mm, finishing operations
The roughness of roller is 3.5um.
Performance after the hot press-formed steel continuous annealing is：Tensile strength is 628MPa, and yield strength is 443MPa,
Elongation percentage A80mm is 20.5%.Performance after hot press-formed again is：Tensile strength is 1605MPa, and elongation percentage A50mm is
6.5%, meet customer requirement；Hot press-formed rear oxidation iron sheet firmness is good.
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 is：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 is：1）Annealing operation：Equal 800 DEG C of temperature section temperature, 680 DEG C of rapid cooling started temperature, rapid cooling terminates
400 DEG C of temperature, 370 DEG C of lapse of time temperature, whole cold section of 140 DEG C of end temp, 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 operation：Smooth elongation percentage is 2.0%, and roll-force is 4000KN, and the thickness of product is 2.0mm, finishing operations
The roughness of roller is 3.0um.
Performance after the hot press-formed steel continuous annealing is：Tensile strength is 637MPa, and yield strength is 440MPa,
Elongation percentage A80mm is 21%.Performance after hot press-formed again is：Tensile strength is 1655MPa, and elongation percentage A50mm is 5.5%,
Meet customer requirement；Hot press-formed rear oxidation iron sheet firmness is good.
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 is：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 is：1）Annealing operation：Equal 800 DEG C of temperature section temperature, 680 DEG C of rapid cooling started temperature, rapid cooling terminates
410 DEG C of temperature, 375 DEG C of lapse of time temperature, whole cold section of 145 DEG C of end temp, 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 operation：Smooth elongation percentage is 1.8%, and roll-force is 5000KN, and the thickness of product is 1.8mm, finishing operations
The roughness of roller is 4.0um.
Performance after the hot press-formed steel continuous annealing is：Tensile strength is 659MPa, and yield strength is 459MPa,
Elongation percentage A80mm is 19.5%.Performance after hot press-formed again is：Tensile strength is 1544MPa, and elongation percentage A50mm is
6.0%, meet customer requirement；Hot press-formed rear oxidation iron sheet firmness is good.
Claims (3)
1. a kind of continuous annealing method of hot press-formed steel, it is characterised in that：It includes annealing and smooth operation；The annealing
Operation：Equal 780~800 DEG C of temperature section temperature, 670~690 DEG C of rapid cooling started temperature, 390~410 DEG C of rapid cooling final temperature, timeliness
360~380 DEG C of final temperature, whole cold section of 140~160 DEG C of end temp, 43~50 DEG C of temperature after water quenching.
2. the continuous annealing method of hot press-formed steel according to claim 1, it is characterised in that：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.
3. the continuous annealing method of hot press-formed steel according to claim 1 and 2, it is characterised in that the smooth work
Sequence：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 is 3.0~4.0um.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111299326A (en) * | 2020-03-04 | 2020-06-19 | 首钢京唐钢铁联合有限责任公司 | Preparation method of non-coating hot-formed steel resistant to iron sheet shedding and product thereof |
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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
- 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111299326A (en) * | 2020-03-04 | 2020-06-19 | 首钢京唐钢铁联合有限责任公司 | Preparation method of non-coating hot-formed steel resistant to iron sheet shedding and product thereof |
| CN111299326B (en) * | 2020-03-04 | 2022-03-18 | 首钢京唐钢铁联合有限责任公司 | Preparation method of non-coating hot-formed steel resistant to iron sheet shedding and product thereof |
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