CN101135025A - Production of cold rolling high-strength ultra-deep-drawing steel plate by bell-type furnace and method for manufacturing same - Google Patents
Production of cold rolling high-strength ultra-deep-drawing steel plate by bell-type furnace and method for manufacturing same Download PDFInfo
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- CN101135025A CN101135025A CNA2006100307161A CN200610030716A CN101135025A CN 101135025 A CN101135025 A CN 101135025A CN A2006100307161 A CNA2006100307161 A CN A2006100307161A CN 200610030716 A CN200610030716 A CN 200610030716A CN 101135025 A CN101135025 A CN 101135025A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 66
- 239000010959 steel Substances 0.000 title claims abstract description 66
- 238000005097 cold rolling Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims description 19
- 238000000137 annealing Methods 0.000 claims abstract description 25
- 239000000126 substance Substances 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 4
- 239000001257 hydrogen Substances 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 238000005096 rolling process Methods 0.000 claims abstract description 3
- 239000004615 ingredient Substances 0.000 claims description 7
- 241001062472 Stokellia anisodon Species 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 2
- -1 nitrogen hydrogen Chemical class 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 10
- 239000000203 mixture Substances 0.000 abstract description 4
- 229910052796 boron Inorganic materials 0.000 abstract description 3
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 3
- 230000007704 transition Effects 0.000 abstract description 3
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- 229910052717 sulfur Inorganic materials 0.000 abstract description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract 1
- 238000003723 Smelting Methods 0.000 abstract 1
- 238000005266 casting Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 8
- 238000012545 processing Methods 0.000 description 8
- 238000004080 punching Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The process of producing cold rolled high strength extra-deep drawing steel sheet in a bell type furnace includes the following steps: 1. smelting and casting steel billet with chemical composition comprising C not more than 0.006 wt%, Si not more than 0.30 wt%, Mn 0.15-1.40 wt%, P not more than 0.08 wt%, S not more than 0.02 wt%, N 0.001-0.005 wt%, Al 0.03-0.06 wt%, B 0.0003-0.002 wt%, Ti 0.005-0.015 wt%, Nb 0-0.03 wt%, and Fe and inevitable impurity for the rest; 2. heating to 1100-1250 and rolling; 3. cold rolling in the reduction rate over 73 %; 4. annealing inside a hydrogen or nitrogen-hydrogen bell type furnace at 690-730 deg.c and 5. leveling after annealing. The steel sheet has strength up to 390 MPa, high elongation and r value, high ability of resisting rework brittleness, and ductile-brittle transition temperature lower than -40 deg.c.
Description
Technical field
The present invention relates to cold rolling high-strength ultra-deep-drawing steel plate and manufacture method thereof, particularly a kind of employing bell type annealing furnace is produced cold rolling high-strength ultra-deep-drawing steel plate and manufacture method thereof.
Background technology
Adopting high tensile steel plate is the great development trend of Hyundai Motor with steel.In general, along with the raising punching performance of armor plate strength descends, the steel plate that exploitation has the punching performance that high intensity becomes reconciled concurrently is automobile and Iron And Steel Industry common hope.On Ultra-low carbon gapless atomic steel (IF) basis,, can obtain having concurrently the steel plate of the punching performance that high intensity becomes reconciled by adding solution strengthening elements such as P, Mn and Si.
High strength IF cold-rolled steel sheet is a kind of high tensile steel plate that is widely used in body of a motor car, and the group of drawing of DDQ is mainly used in the inside and outside plate of making automobile.In the world, high-strength IF steel generally has four intensity ranks, is followed successively by 340,370,390 and 440MPa according to tensile strength.Mainly by the continuous annealing process path, annealing temperature is usually between 800～850 ℃ in the manufacturing of high-strength IF steel.In the composition design, mainly contain multiple mentalities of designing such as Ti-IF+P+Mn, Ti-IF+P+Mn+B, Nb-IF+P+Mn, Ti+Nb-IF+P+Mn and Ti+Nb-IF+P+Mn+B.
Japanese Patent No. a kind of 42～46Kg/mm that has been 100,920/97 patent report
2The manufacture method of high strength cold-rolled deep drawing sheet steel, its chemical ingredients is: 0.004%C, 1.01%Si, 0.22%Mn, 0.025%Al, 0.049%Nb, but it is to adopt continuous annealing to produce.
U.S. Patent number 4,544, the chemical ingredients of 419 disclosed steel plates is 0.002～0.015%C,＜1.2%Si, 0.04～0.8%Mn, 0.03～0.10%P, 0.02～0.10%Al, (the Nb of c% * 3～C% * 8+0.02%), the temperature of continuous annealing is 700～900 ℃, and soaking time is 10 seconds～5 minutes, adopts speed of cooling greater than 60 ℃/s to be cooled to 500 ℃ and carries out zinc-plated, adopt this composition and technology can produce other high strength of 340～440MPa level and produce the supersteel plate, it also only is suitable for continuous annealing and continuous hot galvanizing production.Japanese Patent No. is that the patent of 563-38556 and 1-96330 is to adopt the method for bell furnace production high strength ultra-deep punching cold-rolling steel sheet, is the technology of carburizing treatment but it adopts.
High-strength IF steel is a kind of steel plate that has high strength and good stamping performance concurrently, adopt continuous annealing easier to produce, but also there is following shortcoming in it:
1. the investment of continuous annealing production line is higher;
2. need to adopt high annealing temperature, about about 840 ℃, the consumption of the energy is more, and high annealing furnace temperature has also reduced the life-span of stove;
3. to the automatization of production line and having relatively high expectations of operator, control bad easy broken belt;
4. for not having continuous annealing line or be subjected to the restriction of continuous annealing line production dimensions and the enterprise that need to produce super deep-draw high tensile steel plate, be badly in need of wishing that the employing bell furnace produces super deep-draw high tensile steel plate.
Summary of the invention
The purpose of this invention is to provide a kind of bell furnace and produce cold rolling high-strength ultra-deep-drawing steel plate and manufacture method thereof, adopt bell furnace to come the cold rolling super deep-draw high tensile steel plate of deep-draw, intensity rank is from 340MPa to 390MPa, steel plate is except that having high unit elongation and r value, the ability that also has high anti-secondary processing brittleness, DBTT is less than-40 ℃.
For achieving the above object, technical scheme of the present invention is,
A kind of employing bell furnace is produced high-strength ultra-deep-drawing steel plate, and its chemical ingredients mass percent is:
C ≤0.006
Si ≤0.30
Mn 0.15～1.40
P ≤0.08
S ≤0.02
N 0.001～0.005
Al 0.03～0.06
B 0.0003～0.002
Its add-on of Ti and Nb is respectively:
Ti-(48/14)N＝(0.005～0.015)
Nb-(93/12)C＝(0～0.03)
All the other are Fe and inevitable impurity.
The present invention adopts bell furnace to produce the manufacture method of high-strength ultra-deep-drawing steel plate, and it comprises the steps:
1) high-strength ultra-deep-drawing steel plate, its chemical ingredients mass percent is: C≤0.006, Si≤0.30, Mn 0.15～1.40, P≤0.08, S≤0.02, N 0.001～0.005, Al0.03～0.06, and B 0.0003～0.002, its add-on of Ti and Nb is respectively: Ti-(48/14) N=(0.005～0.015), Nb-(93/12) C=(0～0.03), and all the other are Fe and inevitable impurity; Smelt, be cast as steel billet by mentioned component;
2) steel billet is rolling after 1100～1250 ℃ of heating, at Ar
3Above temperature is in the finish to gauge of single-phase austenitic area, and high temperature batches, 680 ℃～730 ℃ of coiling temperatures;
3) cold rolling, adopt the cold rolling draft more than 73%;
4) annealing, perhydro or the cover annealing of nitrogen hydrogen, annealing temperature 690-730 ℃; The annealing back is smooth, obtains finished product.
Further, manufacture method step 2 of the present invention) finishing temperature is 900 ℃～950 ℃.
Under the bell furnace production technique, how overcoming secondary processing brittleness, simultaneously not damage deep drawability be main points of the present invention.
C, N be as the fundamental element of IF steel, must dispose clearance C and N atom in the steel by adding strong carbide and nitride forming element, considers the cost that adds alloying element, and C and N should be controlled at lower level as far as possible.
Si exists as relict element at steel grade, does not specially add.
Mn adds to regulate the intensity of steel as the solution strengthening element, and the Mn% of every interpolation about 1% can improve intensity 60MPa, according to the intensity rank decision addition of the finished product.
The effect of P is similar with Mn, plays the solution strengthening effect, and its strengthening effect is obvious than Mn, and the Mn% of every interpolation about 0.1% can improve intensity 80MPa.But in ultra low carbon IF steel, P is easy to gather partially at crystal boundary in annealing (particularly bell furnace) process, causes secondary processing brittleness, so the add-on of P is difficult for too much.
Al is the deoxidant element in the steel, adopts conventional interpolation.
B mainly plays the effect that suppresses secondary processing brittleness in ultra low carbon IF steel, B is easy to gather partially at crystal boundary after annealing, and crystal boundary is strengthened, thereby has improved the ability of the anti-secondary processing brittleness of steel plate.The adding of B can also improve the anisotropy of IF steel in addition, but too much B will influence the production performance of steel plate.
Ti is mainly used in the N in the fixing steel in ultra low-carbon steel, too high or too low all unfavorable to the performance of steel plate.Cross when low when Ti content, the r value of steel plate will reduce, the intensity raising.When the Ti too high levels, Ti is easy to form the FeTiP phase in containing the IF steel of P, with the solution strengthening effect of reduction P, also will influence the tensile strength of steel plate except that the punching performance that influences steel plate, and controlling suitable Ti content is the key that bell furnace is produced high-strength IF steel.Following table 1 and 2 is that different Ti content is to high-strength IF steel Effect on Performance situation.Therefrom can find out, when the atomic ratio of Ti/N is near 1, over-all properties the best of steel plate.
Table 1 Ti content is to the influence of high-strength IF steel mechanical property
| Numbering | C | Si | Mn | P | S | Al | Ti | Nb | B | N | Ti/N |
| 1 | 33 | <0.03 | 0.35 | 0.038 | 48 | 0.011 | 0.007 | 0.032 | 7 | 30 | 0.68 |
| 2 | 38 | <0.03 | 0.42 | 0.044 | 75 | 0.012 | 0.014 | 0.026 | 15 | 32 | 1.27 |
| 3 | 39 | <0.03 | 0.39 | 0.045 | 49 | 0.025 | 0.029 | 0.033 | 6 | 40 | 1.84 |
| 4 | 40 | <0.03 | 0.41 | 0.043 | 50 | 0.020 | 0.067 | 0.030 | 14 | 24 | 8.14 |
| 5 | 20 | <0.03 | 0.39 | 0.042 | 68 | 0.030 | O.100 | 0.030 | 7 | 40 | 7.28 |
*The unit of remarks: C, S, B, N is ppm
Table 2 Ti content is to the influence (710 ℃ * 4 hours) of high-strength IF steel mechanical property
Nb plays the effect of fixation of C in ultra low-carbon steel, form the NbC precipitated phase, and unnecessary Nb can be solid-solubilized in crystal boundary and the matrix, helps the even growth of coating when pot galvanize, is solid-solubilized in the effect that Nb on the crystal boundary improves the anti-secondary processing brittleness of steel plate in addition in addition.
Beneficial effect of the present invention
Compare with continuous annealing deep-draw high strength ultra-deep punching cold-rolling steel sheet technology, the present invention adopts bell furnace to produce super deep-draw cold rolling high strength steel plate, the armor plate strength rank of producing is from 340MPa to 390MPa, steel plate is except that having high unit elongation and r value, the ability that also has high anti-secondary processing brittleness, ductile-brittle transition temperature (DBTT) is less than-40 ℃.In addition, advantages such as adopting bell furnace to produce this a series of steel plate also to have less investment, be easy to organize and the dimensions variation range of steel plate is wide.
Embodiment
Embodiment is referring to table 3, smelt the back slab and be heated to 1230 ℃ of insulations 1 hour, adopt 910 ℃ of finish to gauges and 700 ℃ to batch, the cold rolling draft of employing 80% is rolled down to 0.8mm, with stove be heated to 710 ℃ of insulations after 4 hours stove cold, steel plate carries out Mechanics Performance Testing according to JIS13# sample processing and to it.Ductile-brittle transition temperature DBTT carries out according to the GM9920P standard.
Table 3 chemical ingredients (wt%)
| Embodiment | C | Si | Mn | P | S | N | Al | Ti | Nb | B |
| 1 | 0.0011 | 0.02 | 0.15 | 0.040 | 0.005 | 0.0014 | 0.05 | 0.019 | 0.023 | 0.0008 |
| 2 | 0.0013 | 0.02 | 0.18 | 0.032 | 0.0044 | 0.0013 | 0.057 | 0.018 | 0.02 | 0.0003 |
| 3 | 0.0016 | 0.07 | 0.15 | 0.080 | 0.0072 | 0.0023 | 0.049 | 0.02 | 0.02 | 0.002 |
| 4 | 0.0018 | 0.03 | 0.16 | 0.039 | 0.0064 | 0.005 | 0.047 | 0.028 | 0.019 | 0.0008 |
| 5 | 0.0022 | 0.03 | 0.74 | 0.034 | 0.0056 | 0.0016 | 0.047 | 0.02 | 0.025 | 0.0008 |
| 6 | 0.003 | 0.30 | 1.4 | 0.050 | 0.0039 | 0.0016 | 0.045 | 0.014 | 0.025 | 0.0012 |
| 7 | 0.006 | 0.03 | 0.4 | 0.040 | 0.012 | 0.0030 | 0.060 | 0.020 | 0.05 | 0.0006 |
| 8 | 0.0025 | 0.10 | 1.0 | 0.020 | 0.010 | 0.0025 | 0.060 | 0.021 | 0.03 | 0.0013 |
Table 4 mechanical property
| Embodiment | Yield strength (MPa) | Tensile strength (MPa) | Unit elongation 80 (%) | The N value | Value | DBTT(℃) |
| 1 | 206 | 365 | 40 | 0.21 | 1.6 | -50℃～ -80℃ |
| 2 | 191 | 354 | 40 | 0.23 | 1.8 | |
| 3 | 205 | 360 | 38 | 0.21 | 1.6 | |
| 4 | 205 | 376 | 39 | 0.23 | 1.6 | |
| 5 | 212 | 379 | 38 | 0.22 | 1.7 | |
| 6 | 264 | 414 | 34 | 0.2 | 1.5 | |
| 7 | 210 | 354 | 36 | 0.21 | 1.6 | |
| 8 | 230 | 393 | 35 | 0.20 | 1.6 |
Table 4 be the embodiment steel after above-mentioned art breading mechanical property, as seen from the table, adopt composition of the present invention and technology, can produce the super deep-draw high strength cold rolled steel plate of excellent combination property with bell furnace.
Claims (3)
1. an employing bell furnace is produced high-strength ultra-deep-drawing steel plate, and its chemical ingredients mass percent is:
C ≤0.006
Si ≤0.30
Mn 0.15～1.40
P ≤0.08
S ≤0.02
N 0.001～0.005
Al 0.03～0.06
B 0.0003～0.002
Its add-on of Ti and Nb is respectively:
Ti-(48/14)N＝(0.005～0.015)
Nb-(93/12)C＝(0～0.03)
All the other are Fe and inevitable impurity.
2. employing bell furnace as claimed in claim 1 is produced the manufacture method of high-strength ultra-deep-drawing steel plate, and it comprises the steps:
1) high-strength ultra-deep-drawing steel plate, its chemical ingredients mass percent is: C≤0.006, Si≤0.30, Mn 0.15～1.40, P≤0.08, S≤0.02, N0.001～0.005, Al0.03～0.06, B0.0003～0.002, its add-on of Ti and Nb is respectively: Ti-(48/14) N=(0.005～0.015), Nb-(93/12) C=(0～0.03), and all the other are Fe and inevitable impurity; Smelt, be cast as steel billet by mentioned component;
2) steel billet is rolling after 1100～1250 ℃ of heating, at Ar
3The single-phase austenitic area finish to gauge of above temperature, high temperature batches, 680 ℃～730 ℃ of coiling temperatures;
3) cold rolling, adopt the cold rolling draft more than 73%;
4) annealing, perhydro or the cover annealing of nitrogen hydrogen, annealing temperature 690-730 ℃;
5) the annealing back is smooth, obtains finished product.
3. employing bell furnace as claimed in claim 1 is produced the manufacture method of high-strength ultra-deep-drawing steel plate, it is characterized in that step 2) finishing temperature is 900 ℃～950 ℃.
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