CN104593674B - Galvanizing ultra-low carbon baking hardening steel and its production method - Google Patents
Galvanizing ultra-low carbon baking hardening steel and its production method Download PDFInfo
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- CN104593674B CN104593674B CN201510030712.2A CN201510030712A CN104593674B CN 104593674 B CN104593674 B CN 104593674B CN 201510030712 A CN201510030712 A CN 201510030712A CN 104593674 B CN104593674 B CN 104593674B
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Abstract
The invention discloses a kind of galvanizing 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%, remaining is Fe and inevitable impurity.The invention also discloses a kind of method for producing above-mentioned galvanizing ultra-low carbon baking hardening steel.A kind of galvanizing ultra-low carbon baking hardening steel provided by the invention and its production method, by adding B element, by rationally controlling the key alloying elements such as C, Mn, P, Ti and hot rolling, cold rolling, hot dip galvanizing process, produce the excellent galvanizing ultra-low carbon baking hardening steel plate of resistance to secondary processing brittleness and comprehensive mechanical property, meet high-end user vehicle requirement, bring considerable economic benefit.
Description
Technical field
The present invention relates to technical field of steel production, more particularly to a kind of galvanizing ultra-low carbon baking hardening steel and its production
Method.
Background technology
In the 1970s, baking hardened steel starts to be applied to auto industry, and there is higher intensity, good with it
Dent resistance and formability have obtained extensive concern, solve the contradiction of high intensity and good formability well.Baking
The general principle of hardened steel plate is strain-aging, kept in the annealed sheet steel after hot rolling and cold rolling appropriate solid solution carbon or/
And nitrogen-atoms, after steel plate is subjected to deformation, then substantially increase through paint baking, its intensity.At present, baking hardening steel plate is extensive
For producing the inside and outside plate of automobile, mainly there are continuous annealing and galvanizing production.Hot-galvanizing-baking hardened steel plate not only has continuous annealing baking hard
Change the good formability and dent resistance of steel plate, and there is good corrosion resistance and excellent surface quality.
Iron and steel enterprise is carried out to the mechanism of baking hardening steel plate and commercial development application in one's power for domestic and international colleges and universities, research institute
Relatively broad research.Currently, baking hardening steel plate mainly has three kinds of processing such as Ti processing, Nb processing and Ti+Nb Combined Processings
Mode.In recent years, domestic and international researcher improves the synthesis mechanical property of baking hardening steel plate by adding the alloying elements such as Mo, V and B
Can, and good effect is served, result of study shows, the ultra-low carbon baking hardening steel of Ti and the compound additions of V has well
Mechanical property, higher BH values and good aging resistance.In the industrial production, Ti processing, Nb processing and Ti+Nb mainly answer
Three kinds of baking hardening steel plates such as conjunction processing.Generally, galvanizing ultra-low carbon baking hardening steel plate is used to manufacture outside automobile using
Plate, in addition to requiring that steel plate has good BH values, aging resistance, formability, dent resistance, it is also desirable to have excellent two
Secondary processing fragility.In the prior art in order to improve armor plate strength, solution strengthening element P, P are added to cyrystal boundary segregation, the P of grain boundaries
Content is high 10 times than the P content in matrix, easily causes the secondary operation of steel plate brittle, so that the automobile board member after punching press
Intercrystalline cracking occurs for high velocity impact under severe cold environment, the peril for causing automobile component to ftracture.
The content of the invention
It is an object of the invention to provide one kind to enhance product performance, and reduces the galvanizing of secondary processing brittleness transition temperature
Ultra-low carbon baking hardening steel and its production method.
One aspect of the present invention, there is provided a kind of galvanizing ultra-low carbon baking hardening steel, its chemical composition quality percentage
Than for：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%, remaining is for Fe and not
Impurity can be avoided.
Another aspect of the present invention, there is provided a kind of method for producing above-mentioned galvanizing ultra-low carbon baking hardening steel, bag
Include：By after smelting the chemical composition slab as claimed in claim 1 obtained and being heated, heat is obtained by roughing, finish rolling
Roll plate；
The hot rolled plate is coiled into hot rolled coil after section cooling；
The hot rolled coil is obtained into chill volume by cold rolling；
The chill volume is obtained into strip by continuous annealing treatment；
Then it is flattened to coil into finished product by the strip after galvanizing is handled.
Further, when the slab is heated, heating-up temperature is 1100~1300 DEG C, and soaking time is 2~5 small
When.
Further, during by the slab after heating by roughing, finish rolling, roughing outlet temperature is 1000~1200 DEG C, heat
Finishing temperature is rolled for 750~960 DEG C.
Further, when the hot rolled plate being coiled into hot rolled coil after section cooling, coiling temperature is 600~780 DEG C.
Further, when the hot rolled coil being obtained into chill volume by cold rolling, cold rolling reduction ratio is 70~95%.
Further, when the strip after galvanizing is handled carries out smooth, using the wet finishing pattern of finishing liquid, finishing extension
Rate 0.5~3.0%.
A kind of galvanizing ultra-low carbon baking hardening steel provided by the invention and its production method, by adding B element, pass through
Rationally control key alloying elements and hot rolling, cold rolling, the hot dip galvanizing process such as C, Mn, P, Ti, produce resistance to secondary processing brittleness and
The excellent galvanizing ultra-low carbon baking hardening steel plate of comprehensive mechanical property, meets high-end user vehicle requirement, brings considerable warp
Ji benefit.
Embodiment
A kind of galvanizing ultra-low carbon baking hardening steel provided in an embodiment of the present invention, its chemical composition is by weight percentage
For：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%, remaining is Fe and can not
Avoid impurity.
Can have steel plate in this composition range 0.001~0.005% the control of the content of C element in the present invention
There is excellent formability, and can provides enough superfluous C contents, steel plate is had enough baking hardening values.
Mn exists in steel in a manner of being dissolved or separate out, and in addition to playing a part of solution strengthening, can also be combined with S, prevents
Only steel plate occurs red crisp.Mn contents are too low, then do not have reinforcing and prevent the red crisp effect of steel plate；Mn contents are too high, then reduce
The formability of steel plate, therefore its content range is controlled in 0-1.0% in the present invention.
Si and P has intensified element in this steel, too high levels, can reduce Sheet Forming Ability, therefore according to intensity and its
He property requires that Si and P maximum adding quantity are respectively 0.12% and 0.50%.
Al has the function that deoxidation and improves carbonitride-forming elements recovery rate, when its content is less than 0.01%, effect
Unobvious, when addition is higher than 0.30%, effect that cannot be corresponding with addition, therefore Al content scope control in the present invention
System is in 0.01%-0.30%.
Ti can be combined with C, S, N in steel, and removing solute N simultaneously has the function that precipitation strength, in order that Ti can remove it is molten
Matter N and cans ensure that steel plate has enough superfluous C contents, and its control range is 0.004%-0.01%.
B is gathered in crystal boundary in steel grade, strengthens crystal boundary adhesion, it is suppressed that P cyrystal boundary segregation, improves steel plate and resists secondary add
Work fragility.The minimum B additions for acting on its anti-secondary processing brittleness are 0.0003%, and when B content is too high, steel plate can be caused crisp
Property, steel plate deep drawing quality is reduced, therefore its content is not higher than 0.0040%.
For the pure ultra-low-carbon steel of steel of the present invention, forming requirements are higher, are mingled with to avoid the formation of MnS, S maximum levels
Not higher than 0.01%.
N had both been unfavorable for steel plate deep drawing quality, was unfavorable for the aging resistance of steel plate again, reduced its content as far as possible, and generally it contains
Amount is below 0.01%, therefore, N content is defined into 0.01% in the present invention.
The embodiment of the present invention additionally provides a kind of method for producing above-mentioned galvanizing ultra-low carbon baking hardening steel, including following
Several steps：
Step S1：After the slab of above-mentioned chemical composition through smelting acquisition is heated, by roughing, finish rolling, laminar flow
Hot rolled coil is coiled into after cooling；
When slab after heating is passed through roughing, finish rolling and batched, hot rolling finishing temperature is 750~960 DEG C, coiling temperature
For 600~780 DEG C.
When hot rolling finishing temperature is more than 960 DEG C, the crystal grain of hot rolled plate becomes thick, reduces the depth of steel plate after cold rolling, annealing
Punching property；Conversely, when if finishing temperature is less than 750 DEG C, steel plate deformed drag is larger, and rolling load is larger, and rolling is difficult to, because
Hot rolling finishing temperature is set as 750~960 DEG C by this.
Steel plate, using section cooling, after being cooled to coiling temperature setting range, steel sheet edge folded is entered after finish rolling terminates
Row air cooling.Coiler plate temperature is higher, and Carbonitride Precipitation thing is thicker, when temperature is higher than 780 DEG C, surface of steel plate iron scale
It is blocked up, influence the follow-up pickling quality of steel plate.If coiling temperature is less than 600 DEG C, batch more difficult, therefore coiler plate temperature is set
It is set to 600~780 DEG C.
Step S2：By the hot rolled coil by obtaining chill volume after pickling and cold rolling；
When the hot rolled coil is obtained into chill volume by cold rolling, cold rolling reduction ratio is 70~95%.Big cold rolling reduction ratio
Ensure that steel plate has enough deformation energies, ensure that steel plate has tiny crystal grain and favorable texture during subsequent anneal
Performance.When cold rolling reduction ratio is less than 70%, enough plastic deformations do not occur for steel plate, can not obtain desired high r values.But
It is that, when cold rolling reduction ratio is more than 95%, steel plate r values reduce on the contrary.Therefore, the range set of cold rolling reduction ratio be 70~
95%.
Step S3：The chill volume is coiled into after uncoiling-welding-cleaning-annealing-galvanizing-finishing
Product.
After cold rolling, steel plate carries out 750~900 DEG C of recrystallization annealing.When annealing temperature is less than 700 DEG C, one side steel plate
Carbide dissolution is less, and solid solution atom C content is less, can not ensure the BH values required by steel plate, and another aspect steel plate occurs again
Crystallize insufficient, reduce the deep drawing quality of steel plate.However, when annealing temperature is higher than 900 DEG C, austenite transformation, texture occur for steel plate
Become disordering, reduce r values, and then reduce steel plate deep drawing quality.Therefore, steel plate annealing temperature is set as 700~900 DEG C.
After recrystallization annealing and galvanizing, apply 0.5~3% finishing elongation percentage to steel plate, to ensure steel plate
Plate shape and roughness.When finishing elongation percentage is less than 0.5%, plate shape, roughness can not be optimized to steel plate and eliminate yield point elongation
Effect；When finishing elongation percentage is higher than 3%, steel plate sends processing hardening, influences the formability of steel plate, therefore, light plate of the present invention
The control range of finishing elongation percentage is 0.5~3%.
A kind of galvanizing ultra-low carbon baking hardening steel provided by the invention and its production method, by adding B element, pass through
Rationally control key alloying elements and hot rolling, cold rolling, the hot dip galvanizing process such as C, Mn, P, Ti, produce resistance to secondary processing brittleness and
The excellent galvanizing ultra-low carbon baking hardening steel plate of comprehensive mechanical property, meets high-end user vehicle requirement, brings considerable warp
Ji benefit.
Below by specific embodiment, the present invention is described in detail.
The present invention have studied the galvanizing ultra-low carbon baking hardening steel plate of different chemical composition in various processes condition
Under mechanical property feature, chemical composition is shown in Table 1.
The galvanizing ultra-low carbon baking hardening steel plate chemical composition of table 1
Production technology is shown in Table 2.
The production technology of table 2
Final finished mechanical property is shown in Table 3.
The galvanizing ultra-low carbon baking hardening steel plate mechanical property of table 3
It can be seen that according to requirement of the present invention, can produce baking hardening value stabilization 35~50MPa, it is secondary plus
Work brittle transition temperature is not higher than -80 DEG C, the excellent galvanizing ultra-low carbon baking hardening steel plate of comprehensive mechanical property.
It should be noted last that above embodiment is merely illustrative of the technical solution of the present invention and unrestricted,
Although the present invention is described in detail with reference to example, it will be understood by those within the art that, can be to the present invention
Technical scheme modify or equivalent substitution, without departing from the spirit and scope of technical solution of the present invention, it all should cover
Among scope of the presently claimed invention.
Claims (3)
- A kind of 1. method for producing galvanizing ultra-low carbon baking hardening steel, it is characterised in that including：By after smelting the slab obtained and being heated, hot rolled plate is obtained by roughing, finish rolling；Wherein, the slab is carried out During heating, heating-up temperature is 1100~1300 DEG C, and soaking time is 2~5 hours；By the slab after heating by roughing, finish rolling When, roughing outlet temperature is 1000~1200 DEG C, and hot rolling finishing temperature is 750~960 DEG C；The hot rolled plate is coiled into hot rolled coil after section cooling；The hot rolled coil is obtained into chill volume by cold rolling；The chill volume is obtained into strip by continuous annealing treatment, it is cold when the hot rolled coil is obtained into chill volume by cold rolling It is 84%~95% to roll reduction ratio, and after cold rolling, the strip is carried out to 840~900 DEG C of recrystallization annealing；Then it is flattened to coil into finished product by the strip after galvanizing is handled；Wherein, the chemical composition mass percent of the finished product is：C：0.0012%, Si：0.04%, Mn：0.022%, P： 0.045%, Al：0.05%, Ti：0.007%, B：0.0018%, constraint element S：0.005%, N：0.0020%, remaining is Fe And inevitable impurity.
- 2. the production method of galvanizing ultra-low carbon baking hardening steel as claimed in claim 1, it is characterised in that：When the hot rolled plate is coiled into hot rolled coil after section cooling, coiling temperature is 600~780 DEG C.
- 3. the production method of galvanizing ultra-low carbon baking hardening steel as claimed in claim 1, it is characterised in that：When strip after galvanizing is handled carries out smooth, using the wet finishing pattern of finishing liquid, finishing elongation percentage 0.5~3.0%.
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| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
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| 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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| JP2808014B2 (en) * | 1989-06-23 | 1998-10-08 | 新日本製鐵株式会社 | Manufacturing method of good workability cold rolled steel sheet with excellent bake hardenability |
| JP2793348B2 (en) * | 1990-09-28 | 1998-09-03 | 川崎製鉄株式会社 | Manufacturing method of cold-rolled sheet for deep drawing with high bake hardenability |
| CN102719741A (en) * | 2012-06-19 | 2012-10-10 | 武汉钢铁(集团)公司 | Hot-galvanized high-strength steel with 220MPa-level yield strength and production method thereof |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |