CN102409225A - High-strength ultrafine-grained cold-rolled IF steel and production method thereof - Google Patents
High-strength ultrafine-grained cold-rolled IF steel and production method thereof Download PDFInfo
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- CN102409225A CN102409225A CN2010102915242A CN201010291524A CN102409225A CN 102409225 A CN102409225 A CN 102409225A CN 2010102915242 A CN2010102915242 A CN 2010102915242A CN 201010291524 A CN201010291524 A CN 201010291524A CN 102409225 A CN102409225 A CN 102409225A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 65
- 239000010959 steel Substances 0.000 title claims abstract description 65
- 238000004519 manufacturing process Methods 0.000 title abstract description 4
- 239000000126 substance Substances 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 238000005097 cold rolling Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 11
- 238000000137 annealing Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 5
- 238000005098 hot rolling Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 239000004615 ingredient Substances 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- 238000010583 slow cooling Methods 0.000 claims description 4
- 238000009749 continuous casting Methods 0.000 claims description 2
- 238000005554 pickling Methods 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 4
- 239000000203 mixture Substances 0.000 abstract 1
- 239000013078 crystal Substances 0.000 description 29
- 238000005728 strengthening Methods 0.000 description 24
- 239000010955 niobium Substances 0.000 description 18
- 239000000243 solution Substances 0.000 description 16
- 239000002244 precipitate Substances 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 9
- 229910000859 α-Fe Inorganic materials 0.000 description 8
- 239000000047 product Substances 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 4
- 229910052758 niobium Inorganic materials 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000010960 cold rolled steel Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
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- 238000005516 engineering process Methods 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 241001062472 Stokellia anisodon Species 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
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- 230000005540 biological transmission Effects 0.000 description 1
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- 238000004140 cleaning Methods 0.000 description 1
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- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
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Abstract
The invention discloses high-strength ultra-fine grain cold-rolled IF steel with tensile strength of more than or equal to 390MPa and a production method thereof, and the product has good surface quality, formability and secondary processing brittleness resistance and can be used as a galvanized sheet base material. The chemical composition (by weight%) of the steel is C: 0.006-0.01, Si: 0.004 to 0.009, Mn: 1.1-1.6, P: 0.06-0.1, S: less than or equal to 0.01, Als: 0.05-0.06, N: less than or equal to 0.003 and Nb: 0.1-0.15, B: 0.0005 to 0.0015, and the balance Fe and inevitable impurities.
Description
Technical field
The invention belongs to automobile, household electrical appliances are made the field with steel, relate to ultra-fine grained cold rolling IF steel plate and the working method thereof of a kind of tensile strength greater than 390MPa.
Background technology
IF (gap-free atom) steel plate has been widely used in automotive industry as third generation punching press with steel.Traditional high-strength IF steel belongs to the solution strengthening steel; Mainly usually improve intensity through in the IF steel, adding solution strengthening units such as Mn, P, Si; Simultaneously owing to C, N atom are completely fixed; Atom very close to each other exists, and help texture and in annealing process, first develop, so it has good deep drawability again.High-strength IF steel has HS and deep drawability concurrently, can be processed into the part of complicated shape and improve automobile anti-pitting, alleviate vehicle weight, meet the requirement of car safety, loss of weight, energy-saving and environmental protection.
Yet the strengthening mechanism of high tensile steel plate has a lot, mainly comprises: solution strengthening; Precipitation strength; Build up (phase transformation strengthening); Refined crystalline strengthening; Working hardening.Adopt different metallurgical technologies and strengthening mechanism can obtain having the product of different tensile strength and elongation.And, when high-strength IF steel only adopts solution strengthening, be prone to produce secondary processing brittleness owing to lacking grain-boundary strengthening; Simultaneously, the Si heavy damage deep drawability in the solution strengthening element and the surface quality of coating make it not be suitable for the complicated outside plate part that is shaped.
Comprehensive above-mentioned consideration, the mentality of designing of the HS ultra-fine grained cold rolling IF product made from steel that the present invention relates to are to utilize grain refining, precipitation strength to combine original solution strengthening to form the strengthening mechanism of steel.In this novel high-strength IF steel, carbon content will be high more a lot of than traditional high-strength IF steel, reduce the addition of the Si that influences surface quality and expensive solution strengthening elements such as Mo; And add a certain amount of Nb; Form more how tiny niobium carboritride Nb (C, N) and disperse distribute, these tiny throw outs will help to obtain tiny ferrite crystal grain; Through crystal grain thinning strengthen and Nb (C, disperse N) separates out acquisition HS.
In addition, cold working fragility is one of major defect of IF steel, also be high-strength IF steel the problem that must solve.Reason is how high-strength cold rolling IF steel usually carries out solution strengthening with P unit, after the C in the IF steel, N are fixing by elements such as Ti, Nb, and the crystal boundary cleaning, P has the tendency that grain boundary segregation takes place, and the P content in the comparable matrix of content exceeds 10 times.There are some researches show, thus the B element can separate out fast at the crystal boundary place and strengthen crystal boundary, B can also suppress P in the gathering partially of crystal boundary place simultaneously, therefore, adds the Cold Brittleness Transition Temperature that a small amount of B can significantly reduce the IF steel.
Usually, the steel plate of grain refining and disperse precipitation strength, ys also can rise.But owing to comprise unique no precipitate zone (PFZ) in the tissue, make the ys of the ultra-fine brilliant IF steel of novel high-strength not only not increase, can descend to some extent on the contrary.Product innovation obtains tiny ferrite crystal grain under hot-rolled condition, help under cold rolling condition, obtaining to help { the 111} texture of deep drawability.
Patent CN1492068A has proposed ultralow carbon cold-rolled steel plate and the method for manufacture thereof that a kind of tensile strength is the interpolation Nb of 340～440MPa; Patent CN1383459A and CN1780928A then utilize the inner density variation (PFZ) with crystal boundary place precipitate of crystal grain to design the cold-rolled steel sheet of tensile strength greater than 340MPa.Though above-mentioned three kinds of products all have good formability,,, bring difficulty to zincincation simultaneously so the surface quality of steel plate will be affected because they are not very strict to the control of Si constituent content.In addition, although mentioned the improvement effect of B element to secondary processing brittleness in indivedual patent, the example that contains B among the embodiment seldom explains that it can't good use this method.Process aspect in three patents the annealing type of cooling is not all had particular requirement, and the present invention has proposed the two-part type of cooling in order better to control and utilize PFZ, has obtained good effect.
Characteristics such as HS ultra-fine grained cold rolling IF steel of the present invention will have the intensity height, yield tensile ratio is low, plasticity good and anti-secondary processing brittleness is superior are applicable to complex-shaped component such as car panel, gusset or collision bumper; Simultaneously owing to not adopting Si, so be suitable as the baseplate material of alloying galvanized sheet as strengthening element.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art; The object of the present invention is to provide HS ultra-fine grained cold rolling IF steel and the working method thereof of a kind of tensile strength >=390MPa; This product has favorable surface quality, formability and anti-secondary processing brittleness, can be used as the galvanized sheet base material and uses.
Main contents of the present invention are following:
The present invention utilizes grain refining, precipitation strength to combine the strengthening mechanism of original solution strengthening as product innovation to achieve these goals.In this novel high-strength IF steel, carbon content will be high more a lot of than traditional high-strength IF steel, reduce the addition of the Si that influences surface quality and expensive solution strengthening elements such as Mo; And add a certain amount of Nb; Form more how tiny niobium carboritride Nb (C, N) and disperse distribute, these tiny throw outs will help to obtain tiny ferrite crystal grain; Through crystal grain thinning strengthen and Nb (C, disperse N) separates out acquisition HS.Owing to comprise unique no precipitate zone (PFZ) in the tissue, make the ys of the ultra-fine brilliant IF steel of novel high-strength not only not increase, can descend to some extent on the contrary.The adding of a small amount of B element will suppress the grain boundary segregation of P, improve the secondary processing brittleness of steel plate.
A kind of HS ultra-fine grained cold rolling IF steel; The chemical ingredients (% by weight) that it is characterized in that steel is C:0.006～0.01, Si:0.004～0.009, Mn:1.1～1.6, P:0.06～0.1, S :≤0.01, Als:0.05～0.06, N :≤0.003, Nb:0.1～0.15, B:0.0005～0.0015, surplus are Fe and unavoidable impurities.
C:C and Nb form carbide, are to be used near the ferritic crystal boundary and the inner important element that forms precipitate density different zones of ferrite crystal grain.When C contained quantity not sufficient, ferritic intracrystalline precipitate density was low excessively, and armor plate strength descends; During the C content overproof, precipitate density raises near the crystal boundary, and steel plate ductility reduces, and is easy to generate the punching press crackle, and the shaping surplus is dwindled.Therefore, the present invention requires C content between 0.006～0.01%.
Si:Si does not form carbide in steel; Be present in ferritic or the austenite with the sosoloid form; Improve the intensity and the cold deformation cementation index of steel through solution strengthening, can add, also reduce the plasticity and the toughness of steel simultaneously to a certain extent according to intensity rank.In addition; The equilibrium partial pressure of Si when generating oxide compound is lower than other elements; Belong to easy oxidation element, the annealing back is enriched in surface of steel plate with oxide form, thereby worsens the wellability of steel plate and the tack of zinc plated plate plated layer; Reduce the anti-crackle property and the anti-separability of alloying coating, be easy to generate pin hole shape defectives such as " plating leakages ".Therefore,, can cause plate surface quality to descend, reduce the plasticity of steel plate simultaneously,, require its content to be controlled between 0.004～0.009% so the present invention does not adopt Si as main solution strengthening element along with the increase of Si content.
Mn:Mn is one of main solution strengthening element of the present invention, and it improves intensity through making hot-rolled steel sheet grain refining and solution strengthening, and does not influence the tack of coating.Mn content is low, and then armor plate strength is not enough, the Mn too high levels, and then steel formability property decline, so the present invention controls its content between 1.1～1.6%.
P:P is another main solution strengthening element of the present invention; But it can promote ferrite crystal grain to grow up, and makes the hot-rolled sheet grain coarsening, is easy to simultaneously gather partially in the crystal boundary place; Worsen plasticity and secondary processing brittleness, so the present invention requires P content between 0.06～0.1%.
S:S exists with sulphided form in steel, is the harmful element in the steel plate, is unfavorable for the plasticity of steel plate, so the present invention requires its content below 0.01%.
Als:Al is the deoxidant element in the steel-making, and can separate out with the N formation AlN in the steel, alleviates the damaging effect of solid solution N.Als is not enough, and above-mentioned effect is difficult to give full play to, and Als is excessive, then can influence the surface quality of steel plate.Therefore the present invention requires its content to be controlled between 0.05～0.06%.
N:N is the harmful element in the steel, and too high meeting causes steel plate aging resistance variation.Therefore, the present invention requires the N constituent content to be controlled at below 0.003%.
Nb:Nb combines to form carbide with C, be near the ferritic crystal boundary with the inner important element that forms precipitate density different zones of crystal grain.When Nb content hanged down, the inner precipitate density of ferrite crystal grain was not enough, and when Nb content was high, then crystal boundary place precipitate density was also high, caused plasticity to descend.Therefore, the Nb content requirement among the present invention is between 0.1～0.15%.
B:B can stop growing up of when annealing ferrite crystal grain, prevents the reduction of unit elongation and r value, thereby the B element also can be separated out the reinforcement crystal boundary fast at the crystal boundary place simultaneously, and inhibition P gathers the crystal boundary place partially, improves the secondary processing brittleness of steel plate.Because too high B will obviously reduce the plasticity of steel plate, so the present invention requires its content to be controlled between 0.0005～0.0015%.
The working method of the ultra-fine brilliant IF steel of HS of the present invention is following:
Smelt according to mentioned component, continuous casting becomes slab.
Hot rolling: slab heating temperature is 1150～1250 ℃; The hot rolling start rolling temperature is 1100 ℃, and finishing temperature is 870～910 ℃; Curling temperature is 620～660 ℃.
Pickling and cold rolling: cold rolling draft is controlled between 75～85%.
Continuous annealing: heating rate is 10 ℃/s, and Heating temperature is 800～840 ℃, and soaking time is 120～160s; Slow cooling speed is 15 ℃/s, and the slow cooling temperature out is 660～700 ℃, and fast cooling rate rate is 35 ℃/s; Aging temp is 350 ℃, and aging time is 500～600s.Smooth: smooth draft is 0.4～1.0%.
The invention has the beneficial effects as follows:
(1) ferrite crystal grain is tiny in the steel plate, and crystal grain inside exists, and Nb (C, N) a large amount of, tiny, that disperse distributes separates out, and except that indivedual larger-size precipitates, forms PFZ (nothing is separated out the district) along crystal boundary near the crystal boundary;
(2) above-mentioned tissue signature causes steel plate when tensile strength improves, and ys does not only increase, and can descend to some extent on the contrary, thereby make steel plate have good plasticity;
(3) adding of a small amount of B element has suppressed the segregation of P at crystal boundary, has improved the anti-secondary processing brittleness of steel plate;
(4) do not use Si as the solution strengthening element, improved the surface quality of steel plate, can be as the base material of galvanized sheet.
Description of drawings
The metallographic structure figure of Fig. 1 steel plate of the present invention;
Fig. 2 steel plate transmission electron microscope of the present invention film figure.
Embodiment
Below in conjunction with several specific embodiments super high tensile cold-rolled steel plate of the present invention and method of manufacture thereof are described.
The embodiment chemical ingredients is as shown in table 1:
Table 1 chemical ingredients (wt%)
| Embodiment | C | Si | Mn | P | S | Als | N | Nb | B | Fe |
| 1 | 0.0067 | 0.004 | 1.12 | 0.067 | 0.0031 | 0.058 | 0.0028 | 0.12 | 0.0009 | Surplus |
| 2 | 0.0082 | 0.008 | 1.29 | 0.069 | 0.0038 | 0.053 | 0.0026 | 0.13 | 0.0011 | Surplus |
| 3 | 0.0074 | 0.006 | 1.37 | 0.061 | 0.0025 | 0.056 | 0.0023 | 0.13 | 0.0010 | Surplus |
| 4 | 0.0080 | 0.007 | 1.19 | 0.077 | 0.0034 | 0.055 | 0.0026 | 0.12 | 0.0012 | Surplus |
| 5 | 0.0070 | 0.005 | 1.46 | 0.081 | 0.0036 | 0.053 | 0.0029 | 0.11 | 0.0009 | Surplus |
| 6 | 0.0075 | 0.009 | 1.59 | 0.092 | 0.0028 | 0.057 | 0.0027 | 0.13 | 0.0010 | Surplus |
The embodiment rolling technological parameter is as shown in table 2:
Table 2 rolling technological parameter
Embodiment connect move back and flattening technological parameter as shown in table 3:
Table 3 even moves back and flattening technological parameter
The mechanical property of embodiment product is as shown in table 4:
The mechanical property of table 4 steel plate
| Embodiment | Rp 0.2(MPa) | ?Rm(MPa) | A(％) | r15 | n |
| 1 | 230 | ?410 | 36.5 | 1.75 | 0.27 |
| 2 | 235 | ?415 | 36 | 1.7 | 0.25 |
| 3 | 245 | ?425 | 36 | 1.65 | 0.26 |
| 4 | 255 | ?450 | 35.5 | 1.65 | 0.24 |
| 5 | 260 | ?460 | 35 | 1.6 | 0.23 |
| 6 | 270 | ?465 | 34 | 1.6 | 0.23 |
Claims (3)
1. HS ultra-fine grained cold rolling IF steel; It is characterized in that: the chemical ingredients of steel (% by weight) is C:0.006～0.01, Si:0.004～0.009, Mn:1.1～1.6, P:0.06～0.1, S :≤0.01, Als:0.05～0.06, N :≤0.003, Nb:0.1～0.15, B:0.0005～0.0015, surplus are Fe and unavoidable impurities.
2. working method according to the said HS ultra-fine grained cold rolling of claim 1 IF steel is smelted, and continuous casting becomes hot rolling behind the slab, it is characterized in that:
The a hot rolling: slab heating temperature is 1150～1250 ℃; The hot rolling start rolling temperature is 1100 ℃, and finishing temperature is 870～910 ℃; Curling temperature is 620～660 ℃;
B pickling and cold rolling: cold rolling draft is controlled between 75～85%;
C continuous annealing: heating rate is 10 ℃/s, and Heating temperature is 800～840 ℃, and soaking time is 120～160s; Slow cooling speed is 15 ℃/s, and the slow cooling temperature out is 660～700 ℃, and fast cooling rate rate is 35 ℃/s; Aging temp is 350 ℃, and aging time is 500～600s;
3. according to the working method of the said HS ultra-fine grained cold rolling of claim 2 IF steel, it is characterized in that: smooth after the continuous annealing, smooth draft is 0.4～1.0%.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747281A (en) * | 2012-07-31 | 2012-10-24 | 首钢总公司 | Batch annealing interstitial-free (IF) steel and production method thereof |
| CN102925796A (en) * | 2012-10-30 | 2013-02-13 | 鞍钢股份有限公司 | Non-alloyed ultra-low carbon cold-rolled sheet for structure and production method thereof |
| CN104384228A (en) * | 2014-09-18 | 2015-03-04 | 北京首钢冷轧薄板有限公司 | Process control method for pickling rolling production of high strength IF steel and device thereof |
| CN104630622A (en) * | 2015-01-20 | 2015-05-20 | 内蒙古科技大学 | High-strength IF steel containing rare earth and preparation method of high-strength IF steel |
| CN106825100A (en) * | 2017-02-16 | 2017-06-13 | 重庆大学 | A kind of preparation method of novel high-strength high-ductility IF steel |
| CN108203789A (en) * | 2016-12-16 | 2018-06-26 | 宝山钢铁股份有限公司 | The high-strength IF steel and its manufacturing method of a kind of fine corrosion resistance |
| CN109518085A (en) * | 2018-12-10 | 2019-03-26 | 北京首钢股份有限公司 | Phosphorus-containing high-strength IF steel and method for eliminating surface pockmark defects thereof |
| CN112222189A (en) * | 2020-09-11 | 2021-01-15 | 山东钢铁集团日照有限公司 | Production method of IF cold-rolled steel strip with high surface quality and high strength |
| CN115627414A (en) * | 2022-09-23 | 2023-01-20 | 马鞍山钢铁股份有限公司 | Phosphorus-containing IF steel plate with secondary processing brittleness resistance and excellent surface quality and production method thereof |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747281A (en) * | 2012-07-31 | 2012-10-24 | 首钢总公司 | Batch annealing interstitial-free (IF) steel and production method thereof |
| CN102925796A (en) * | 2012-10-30 | 2013-02-13 | 鞍钢股份有限公司 | Non-alloyed ultra-low carbon cold-rolled sheet for structure and production method thereof |
| CN102925796B (en) * | 2012-10-30 | 2014-07-09 | 鞍钢股份有限公司 | Non-alloyed ultra-low carbon cold-rolled sheet for structure and production method thereof |
| CN104384228A (en) * | 2014-09-18 | 2015-03-04 | 北京首钢冷轧薄板有限公司 | Process control method for pickling rolling production of high strength IF steel and device thereof |
| CN104630622A (en) * | 2015-01-20 | 2015-05-20 | 内蒙古科技大学 | High-strength IF steel containing rare earth and preparation method of high-strength IF steel |
| CN108203789A (en) * | 2016-12-16 | 2018-06-26 | 宝山钢铁股份有限公司 | The high-strength IF steel and its manufacturing method of a kind of fine corrosion resistance |
| CN108203789B (en) * | 2016-12-16 | 2019-11-22 | 宝钢湛江钢铁有限公司 | A kind of high-strength IF steel and its manufacturing method of fine corrosion resistance |
| CN106825100A (en) * | 2017-02-16 | 2017-06-13 | 重庆大学 | A kind of preparation method of novel high-strength high-ductility IF steel |
| CN106825100B (en) * | 2017-02-16 | 2018-11-02 | 重庆大学 | A kind of preparation method of High-strength high-plasticity IF steel |
| CN109518085A (en) * | 2018-12-10 | 2019-03-26 | 北京首钢股份有限公司 | Phosphorus-containing high-strength IF steel and method for eliminating surface pockmark defects thereof |
| CN109518085B (en) * | 2018-12-10 | 2021-01-08 | 北京首钢股份有限公司 | Phosphorus-containing high-strength IF steel and method for eliminating surface pockmark defects thereof |
| CN112222189A (en) * | 2020-09-11 | 2021-01-15 | 山东钢铁集团日照有限公司 | Production method of IF cold-rolled steel strip with high surface quality and high strength |
| CN115627414A (en) * | 2022-09-23 | 2023-01-20 | 马鞍山钢铁股份有限公司 | Phosphorus-containing IF steel plate with secondary processing brittleness resistance and excellent surface quality and production method thereof |
| CN115627414B (en) * | 2022-09-23 | 2023-07-25 | 马鞍山钢铁股份有限公司 | Secondary processing brittleness resistance and excellent surface quality phosphorus-containing IF steel plate and production method thereof |
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