CN104593674A - Hot-dip galvanized ultra-low carbon bake-hardening steel and production method thereof - Google Patents
Hot-dip galvanized ultra-low carbon bake-hardening steel and production method thereof Download PDFInfo
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Abstract
The invention discloses hot-dip galvanized ultra-low carbon bake-hardening steel. The hot-dip galvanized ultra-low carbon bake-hardening steel comprises the following chemical components in percentage by mass: 0.001-0.005% of C, 0-0.12% of Si, 0-1.0% of Mn, 0-0.50% of P, 0.01-0.30% of Al, 0.004-0.01% of Ti, 0.0003-0.0040% of B, less than or equal to 0.010% of S and less than or equal to 0.01% of S as limiting elements and the balance of Fe and unavoidable impurities. The invention also discloses a production method of the hot-dip galvanized ultra-low carbon bake-hardening steel. According to the hot-dip galvanized ultra-low carbon bake-hardening steel and the production method thereof which are disclosed by the invention, by adding the B element and reasonably controlling key alloying elements such as C, Mn, P and Ti and hot-rolling, cold-rolling and hot-dip galvanizing processes, the hot-dip galvanized ultra-low carbon bake-hardening steel which has the advantages of secondary processing embrittlement resistance and excellent comprehensive mechanical properties is produced, the requirements of high-end car users are met and considerable economic benefits are brought.
Description
Technical field
The present invention relates to technical field of steel production, particularly a kind of pot galvanize ultra-low carbon baking hardening steel and production method thereof.
Background technology
20 century 70s, baking hardened steel starts to be applied to automotive industry, and has higher intensity, good dent resistance and plasticity with it and obtain and pay close attention to widely, well solves the contradiction of high strength and good plasticity.The ultimate principle of bake hardening steel is strain aging, through hot rolling and cold rolling after annealed sheet steel in keep appropriate solid solution carbon or/and nitrogen-atoms, after steel plate stands distortion, then through paint baking, its intensity obviously increases.At present, bake hardening steel has been widely used in produces the inside and outside plate of automobile, and the company of mainly containing moves back and galvanizing production.Hot galvanizing bake hardening steel not only has the good plasticity and the dent resistance that connect and move back bake hardening steel, and has good solidity to corrosion and excellent surface quality.
Domestic and international colleges and universities, research institute in one's power iron and steel enterprise have carried out studying comparatively widely to the mechanism of bake hardening steel and commercial exploitation application.Current, bake hardening steel mainly contains three kinds of processing modes such as Ti process, Nb process and Ti+Nb Combined Processing.In recent years, domestic and international investigator is by adding the alloying elements such as Mo, V and B to improve the comprehensive mechanical property of bake hardening steel, and serve good effect, result of study shows, the ultra-low carbon baking hardening steel that Ti and V compound is added has good mechanical property, higher BH value and good aging resistance.In the industrial production, three kinds of bake hardening steels such as Ti process, Nb process and Ti+Nb Combined Processing are mainly contained.Generally, pot galvanize ultra-low carbon baking hardening steel plate, for the manufacture of automobile outside plate, except requiring that steel plate has except good BH value, aging resistance, plasticity, dent resistance, also requires to have excellent secondary processing brittleness.In order to improve armor plate strength in prior art, add solution strengthening element P, P is to grain boundary segregation, P content in the comparable matrix of P content of grain boundaries is high 10 times, easily cause the secondary processing of steel plate brittle, thus make the high velocity impact generation intercrystalline cracking under severe cold environment of the auto sheet parts after punching press, cause the Peril Incident that trolley part ftractures.
Summary of the invention
The object of this invention is to provide one can enhance product performance, reduce pot galvanize ultra-low carbon baking hardening steel and the production method thereof of secondary processing brittleness transition temperature.
One aspect of the present invention, provide a kind of pot galvanize ultra-low carbon baking hardening steel, its chemical composition mass percent is: C:0.001 ~ 0.005%, Si:0 ~ 0.12%, Mn:0 ~ 1.0%, P:0 ~ 0.50%, Al:0.01 ~ 0.30%, Ti:0.004 ~ 0.01%, B:0.0003 ~ 0.0040%, constraint element S≤0.010%, N≤0.01%, all the other are Fe and inevitable impurity.
Another aspect of the present invention, provides a kind of method of producing above-mentioned pot galvanize ultra-low carbon baking hardening steel, comprising: after being heated by the chemical composition slab as claimed in claim 1 through smelting acquisition, obtains hot-rolled sheet through roughing, finish rolling;
Described hot-rolled sheet is coiled into hot rolled coil after section cooling;
By described hot rolled coil by the chill volume of cold rolling acquisition;
Described chill volume is obtained band steel through continuous annealing process;
Then by described band steel after pot galvanize process, coil into finished product through smooth.
Further, when being heated by described slab, Heating temperature is 1100 ~ 1300 DEG C, and soaking time is 2 ~ 5 hours.
Further, by the slab after heating through roughing, finish rolling, roughing temperature out is 1000 ~ 1200 DEG C, and hot rolling finishing temperature is 750 ~ 960 DEG C.
Further, when described hot-rolled sheet is coiled into hot rolled coil after section cooling, coiling temperature is 600 ~ 780 DEG C.
Further, during by chill by cold rolling acquisition for described hot rolled coil volume, cold rolling draft is 70 ~ 95%.
Further, when being undertaken smooth by the band steel after pot galvanize process, finishing liquid is adopted to wet polishing pattern, polishing unit elongation 0.5 ~ 3.0%.
A kind of pot galvanize ultra-low carbon baking hardening steel provided by the invention and production method thereof, by adding B element, by the key alloying elements such as conservative control C, Mn, P, Ti and hot rolling, cold rolling, hot dip galvanizing process, produce the pot galvanize ultra-low carbon baking hardening steel plate of resistance to secondary processing brittleness and comprehensive mechanical property excellence, meet high-end user vehicle requirement, bring considerable economic benefit.
Embodiment
A kind of pot galvanize ultra-low carbon baking hardening steel that the embodiment of the present invention provides, its chemical composition is by weight percentage: C:0.001 ~ 0.005%, Si:0 ~ 0.12%, Mn:0 ~ 1.0%, P:0 ~ 0.50%, Al:0.01 ~ 0.30%, Ti:0.004 ~ 0.01%, B:0.0003 ~ 0.0040%, constraint element S≤0.010%, N≤0.01%, all the other are Fe and inevitable impurity.
In the present invention, the content of C element is controlled 0.001 ~ 0.005%, steel plate can be made in this composition range to have excellent plasticity, enough superfluous C content can be provided again, make steel plate have enough baking hardening values.
Mn exists in steel in the mode of solid solution or precipitation, except the effect playing solution strengthening, also can be combined with S, prevents steel plate from occurring red crisp.Mn content is too low, then do not have strengthening and prevent the red crisp effect of steel plate; Mn content is too high, then reduce the plasticity of steel plate, and therefore in the present invention, its content range controls at 0-1.0%.
Si and P has strengthening element in this steel, too high levels, can reduce Sheet Forming Ability, and therefore according to intensity and other property requirements, the maximum adding quantity of Si and P is respectively 0.12% and 0.50%.
Al has deoxidation and improves the effect of carbonitride-forming elements recovery rate, its content lower than 0.01% time, DeGrain, addition higher than 0.30% time, can not get the effect corresponding with addition, therefore in the present invention, Al content range controls at 0.01%-0.30%.
Ti C, S, N can be combined in steel, and remove solute N and have the effect of precipitation strength, can remove solute N to make Ti and can ensure that again steel plate has enough superfluous C content, its span of control is 0.004%-0.01%.
B is gathered in crystal boundary at steel grade, strengthens Grain-boundary Junctions and makes a concerted effort, inhibit the grain boundary segregation of P, improve the anti-secondary processing brittleness of steel plate.The B add-on of its anti-secondary processing brittleness of minimum effect is 0.0003%, and during B too high levels, can cause steel plate fragility, and reduce steel plate deep drawing quality, therefore its content is not higher than 0.0040%.
For the ultra low-carbon steel that steel of the present invention is pure, forming requirements is higher, and be mingled with for avoiding the formation of MnS, S maximum level is not higher than 0.01%.
N had both been unfavorable for steel plate deep drawing quality, was unfavorable for again the aging resistance of steel plate, reduced its content as far as possible, and its content is below 0.01% usually, therefore, in the present invention, N content was defined as 0.01%.
The embodiment of the present invention additionally provides a kind of method of producing above-mentioned pot galvanize ultra-low carbon baking hardening steel, comprises following step:
Step S1: after being heated by the slab through smelting the above-mentioned chemical composition obtained, coil into hot rolled coil after roughing, finish rolling, section cooling;
By the slab after heating through roughing, finish rolling with when batching, hot rolling finishing temperature is 750 ~ 960 DEG C, and coiling temperature is 600 ~ 780 DEG C.
When hot rolling finishing temperature is more than 960 DEG C, the crystal grain of hot-rolled sheet becomes thick, reduces deep drawing quality that is cold rolling, the rear steel plate of annealing; Otherwise if when finishing temperature is lower than 750 DEG C, steel plate deformed drag is comparatively large, and rolling load is comparatively large, and rolling is difficult to carry out, and therefore hot rolling finishing temperature is set as 750 ~ 960 DEG C.
Steel plate, after finish rolling terminates, adopts section cooling, after being cooled to coiling temperature setting range, steel sheet edge folded is carried out air cooling.Coiler plate temperature is higher, and Carbonitride Precipitation thing is thicker, and when temperature is higher than 780 DEG C, surface of steel plate iron scale is blocked up, affects the follow-up pickling quality of steel plate.If coiling temperature is lower than 600 DEG C, batch more difficult, therefore coiler plate temperature is set as 600 ~ 780 DEG C.
Step S2: by described hot rolled coil by pickling and the chill volume of cold rolling rear acquisition;
During by chill by cold rolling acquisition for described hot rolled coil volume, cold rolling draft is 70 ~ 95%.Large cold rolling draft ensures that steel plate has enough deformation energies, ensures that steel plate has tiny crystal grain and the performance of favorable texture in subsequent anneal process.When cold rolling draft lower than 70% time, there is not enough viscous deformation in steel plate, cannot obtain expect high r value.But when cold rolling draft is greater than 95%, steel plate r value reduces on the contrary.Therefore, the range set of cold rolling draft is 70 ~ 95%.
Step S3: described chill volume is coiled into finished product after uncoiling-welding-cleaning-anneal-pot galvanize-polishing.
After cold rolling, steel plate carries out the recrystallization annealing of 750 ~ 900 DEG C.When annealing temperature is lower than 700 DEG C, steel plate carbide dissolution is less on the one hand, and solid solution atom C content is less, cannot ensure the BH value required by steel plate, and steel plate generation recrystallize is insufficient on the other hand, reduces the deep drawing quality of steel plate.But when annealing temperature is higher than 900 DEG C, steel plate generation austenitic transformation, texture becomes disordering, reduces r value, and then reduces steel plate deep drawing quality.Therefore, steel plate annealing temperature is set as 700 ~ 900 DEG C.
After recrystallization annealing and pot galvanize, steel plate is applied to the polishing unit elongation of 0.5 ~ 3%, to ensure plate shape and the roughness of steel plate.Polishing unit elongation lower than 0.5% time, the effect of plate shape, roughness and elimination yield point elongation cannot be optimized to steel plate; Polishing unit elongation higher than 3% time, steel plate send work hardening, affect the plasticity of steel plate, therefore, the span of control of light plate polishing unit elongation of the present invention is 0.5 ~ 3%.
A kind of pot galvanize ultra-low carbon baking hardening steel provided by the invention and production method thereof, by adding B element, by the key alloying elements such as conservative control C, Mn, P, Ti and hot rolling, cold rolling, hot dip galvanizing process, produce the pot galvanize ultra-low carbon baking hardening steel plate of resistance to secondary processing brittleness and comprehensive mechanical property excellence, meet high-end user vehicle requirement, bring considerable economic benefit.
Below by specific embodiment, the present invention is described in detail.
The present invention have studied the mechanical property feature of pot galvanize ultra-low carbon baking hardening steel plate under various processes condition of different chemical composition, and chemical composition is in table 1.
Table 1 pot galvanize ultra-low carbon baking hardening steel plate chemical composition
Production technique is in table 2.
Table 2 production technique
Final finished mechanical property is in table 3.
Table 3 pot galvanize ultra-low carbon baking hardening steel plate mechanical property
Visible, according to requirement of the present invention, baking hardening value stabilization can be produced at 35 ~ 50MPa, secondary processing brittleness transition temperature not higher than-80 DEG C, the pot galvanize ultra-low carbon baking hardening steel plate of comprehensive mechanical property excellence.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (7)
1. a pot galvanize ultra-low carbon baking hardening steel, is characterized in that, its chemical composition mass percent is:
C:0.001 ~ 0.005%, Si:0 ~ 0.12%, Mn:0 ~ 1.0%, P:0 ~ 0.50%, Al:0.01 ~ 0.30%, Ti:0.004 ~ 0.01%, B:0.0003 ~ 0.0040%, constraint element S≤0.010%, N≤0.01%, all the other are Fe and inevitable impurity.
2. produce a method for a kind of pot galvanize ultra-low carbon baking hardening steel as claimed in claim 1, it is characterized in that, comprising:
After being heated by chemical composition slab as claimed in claim 1 through smelting acquisition, obtain hot-rolled sheet through roughing, finish rolling;
Described hot-rolled sheet is coiled into hot rolled coil after section cooling;
By described hot rolled coil by the chill volume of cold rolling acquisition;
Described chill volume is obtained band steel through continuous annealing process;
Then by described band steel after pot galvanize process, coil into finished product through smooth.
3. the production method of pot galvanize ultra-low carbon baking hardening steel as claimed in claim 2, is characterized in that:
When being heated by described slab, Heating temperature is 1100 ~ 1300 DEG C, and soaking time is 2 ~ 5 hours.
4. the production method of pot galvanize ultra-low carbon baking hardening steel as claimed in claim 2, is characterized in that:
By the slab after heating through roughing, finish rolling, roughing temperature out is 1000 ~ 1200 DEG C, and hot rolling finishing temperature is 750 ~ 960 DEG C.
5. the production method of pot galvanize ultra-low carbon baking hardening steel as claimed in claim 2, is characterized in that:
When described hot-rolled sheet is coiled into hot rolled coil after section cooling, coiling temperature is 600 ~ 780 DEG C.
6. the production method of pot galvanize ultra-low carbon baking hardening steel as claimed in claim 2, is characterized in that:
During by chill by cold rolling acquisition for described hot rolled coil volume, cold rolling draft is 70 ~ 95%.
7. the production method of pot galvanize ultra-low carbon baking hardening steel as claimed in claim 2, is characterized in that:
When being undertaken smooth by the band steel after pot galvanize process, finishing liquid is adopted to wet polishing pattern, polishing unit elongation 0.5 ~ 3.0%.
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104911478A (en) * | 2015-07-06 | 2015-09-16 | 武汉钢铁(集团)公司 | Cold continuous rolling bake-hardening steel with yield strength 240 MPa and production method thereof |
| CN105603158A (en) * | 2016-03-10 | 2016-05-25 | 河北钢铁股份有限公司邯郸分公司 | Method for controlling dissolved carbon content in ultralow-carbon bake-hardening steel |
| CN106702266A (en) * | 2016-12-19 | 2017-05-24 | 本钢板材股份有限公司 | Ageing-resistant cold-rolled bake-hardening steel 220 BH and production method thereof |
| CN106756554A (en) * | 2016-12-19 | 2017-05-31 | 本钢板材股份有限公司 | A kind of cold rolling baking hardened steel of resistance to timeliness 180BH and its production method |
| CN106906416A (en) * | 2015-12-23 | 2017-06-30 | 本钢板材股份有限公司 | A kind of automobile 180BH cold rolling bakings harden high-strength steel |
| CN106906419A (en) * | 2015-12-23 | 2017-06-30 | 本钢板材股份有限公司 | A kind of automobile 220BH cold rolling bakings harden high-strength steel |
| CN106906418A (en) * | 2015-12-23 | 2017-06-30 | 本钢板材股份有限公司 | The processing method that a kind of automobile hardens high-strength steel with 180BH cold rolling bakings |
| CN106906417A (en) * | 2015-12-23 | 2017-06-30 | 本钢板材股份有限公司 | The processing method that a kind of automobile hardens high-strength steel with 220BH cold rolling bakings |
| CN108531819A (en) * | 2018-03-15 | 2018-09-14 | 鞍钢蒂森克虏伯汽车钢有限公司 | Exempt from the middle hot-dip galvanizing sheet steel and its manufacturing method for applying automobile exterior panel requirement with meeting |
| CN108796388A (en) * | 2018-08-06 | 2018-11-13 | 首钢集团有限公司 | A kind of color coating hot-dip galvanizing sheet steel and its manufacturing method |
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| CN109321839A (en) * | 2018-10-24 | 2019-02-12 | 首钢京唐钢铁联合有限责任公司 | 240 MPa-grade bake-hardening steel and manufacturing method thereof |
| CN110499471A (en) * | 2019-08-22 | 2019-11-26 | 唐山钢铁集团有限责任公司 | A kind of zinc-plated baking hardening steel plate and its production method of the timeliness greater than 6 months |
| CN111636031A (en) * | 2020-06-03 | 2020-09-08 | 北京首钢股份有限公司 | Ultra-low carbon bake-hardening steel and production method thereof |
| CN112063927A (en) * | 2020-09-17 | 2020-12-11 | 南京奇纳金属材料科技有限公司 | High-formability ultra-low carbon bake-hardening steel plate and preparation method thereof |
| CN114411055A (en) * | 2021-12-31 | 2022-04-29 | 河钢股份有限公司 | 220 MPa-grade bake-hardening high-strength steel and production method thereof |
| CN114737126A (en) * | 2022-04-20 | 2022-07-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-dip galvanized steel sheet and method for producing same |
| CN115074616A (en) * | 2021-03-16 | 2022-09-20 | 上海梅山钢铁股份有限公司 | Hot-dip aluminum-zinc steel plate for refrigerator bottom plate and manufacturing method thereof |
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Cited By (21)
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| CN104911478A (en) * | 2015-07-06 | 2015-09-16 | 武汉钢铁(集团)公司 | Cold continuous rolling bake-hardening steel with yield strength 240 MPa and production method thereof |
| CN104911478B (en) * | 2015-07-06 | 2017-05-10 | 武汉钢铁(集团)公司 | Cold continuous rolling bake-hardening steel with yield strength 240 MPa and production method thereof |
| CN106906416A (en) * | 2015-12-23 | 2017-06-30 | 本钢板材股份有限公司 | A kind of automobile 180BH cold rolling bakings harden high-strength steel |
| CN106906419A (en) * | 2015-12-23 | 2017-06-30 | 本钢板材股份有限公司 | A kind of automobile 220BH cold rolling bakings harden high-strength steel |
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| CN105603158A (en) * | 2016-03-10 | 2016-05-25 | 河北钢铁股份有限公司邯郸分公司 | Method for controlling dissolved carbon content in ultralow-carbon bake-hardening steel |
| CN105603158B (en) * | 2016-03-10 | 2017-09-01 | 河北钢铁股份有限公司邯郸分公司 | A kind of method for controlling ultra-low carbon baking hardening steel dissolved carbon content |
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| CN106756554A (en) * | 2016-12-19 | 2017-05-31 | 本钢板材股份有限公司 | A kind of cold rolling baking hardened steel of resistance to timeliness 180BH and its production method |
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| CN108796388A (en) * | 2018-08-06 | 2018-11-13 | 首钢集团有限公司 | A kind of color coating hot-dip galvanizing sheet steel and its manufacturing method |
| CN109321839A (en) * | 2018-10-24 | 2019-02-12 | 首钢京唐钢铁联合有限责任公司 | 240 MPa-grade bake-hardening steel and manufacturing method thereof |
| CN110499471A (en) * | 2019-08-22 | 2019-11-26 | 唐山钢铁集团有限责任公司 | A kind of zinc-plated baking hardening steel plate and its production method of the timeliness greater than 6 months |
| CN111636031A (en) * | 2020-06-03 | 2020-09-08 | 北京首钢股份有限公司 | Ultra-low carbon bake-hardening steel and production method thereof |
| CN112063927A (en) * | 2020-09-17 | 2020-12-11 | 南京奇纳金属材料科技有限公司 | High-formability ultra-low carbon bake-hardening steel plate and preparation method thereof |
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| CN114411055A (en) * | 2021-12-31 | 2022-04-29 | 河钢股份有限公司 | 220 MPa-grade bake-hardening high-strength steel and production method thereof |
| CN114737126A (en) * | 2022-04-20 | 2022-07-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-dip galvanized steel sheet and method for producing same |
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