CN106702266A - Ageing-resistant cold-rolled bake-hardening steel 220 BH and production method thereof - Google Patents
Ageing-resistant cold-rolled bake-hardening steel 220 BH and production method thereof Download PDFInfo
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- CN106702266A CN106702266A CN201611177925.9A CN201611177925A CN106702266A CN 106702266 A CN106702266 A CN 106702266A CN 201611177925 A CN201611177925 A CN 201611177925A CN 106702266 A CN106702266 A CN 106702266A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention belongs to the technical field of ageing-resistant cold-rolled bake-hardening steel and particularly relates to ageing-resistant cold-rolled bake-hardening steel 220 BH and a production method thereof. The ageing-resistant cold-rolled bake-hardening steel 220 BH comprises the following components: 0.001-0.003% of C, less than or equal to 0.05% of Si, 0.35-0.80% of Mn, 0.035-0.080% of P, less than or equal to 0.015% of S, 0.015-0.060% of Als, 0.005-0.030% of Nb, less than or equal to 0.0050% of N, 0.01-0.08% of Mo, and the balance of Fe and inevitable impurities. The problem of poor aging resistance of cold-rolled bake-hardening steel with the yield strength of 220 MPa in the prior art is solved, and application to the automobile industry is facilitated.
Description
Technical field
The invention belongs to the cold rolling baking hardened steel of resistance to timeliness technical field, and in particular to a kind of cold rolling baking of resistance to timeliness hardening
Steel 220BH and its production method.
Background technology
Into 21 century, Domestic Automotive Industry is developed rapidly, and the big automobile production and marketing state of the first in the world has been turned at present, with vapour
The development of car industry, automobile materials are also progressively changing.Baking hardening (BH) steel is due to having excellent forming property and good concurrently
Good dent resistance energy, the main materials as Hyundai Motor panel do not influence the shape stability of drip molding using BH steel plates,
And dent resistance is improve, and the thin-walled property of Automobile Plate is advantageously implemented, BH steel has turned into the important composition portion of Hyundai Motor steel
Point.
Due to the particular/special requirement of automobile material, BH steel plates are gone back while with excellent baking hardenability (abbreviation BH)
Need with resistance to room temperature ageing, but, good BH performances and resistance to room temperature ageing are lances knowable to the mechanism produced by BH
Shield, so it is very big technological difficulties to ensure that there is the steel grade good BH performances to have resistance to room temperature ageing performance concurrently, at present
National and foreign standards are under the conditions of storage at normal temperature, it is ensured that from completion is manufactured in 3 months, the mechanical property of steel plate and steel band
Can should meet relevant criterion requirement, and automobile factory needs longer period of storage, is easy to use.Based on above reason, it is badly in need of one
Plant new technology and solve problem above, produce the cold rolling baking hardened steel product of resistance to timeliness, be preferably the application service of car industry.
The content of the invention
In order to solve the above-mentioned technical problem, the invention provides a kind of cold rolling baking hardened steel of resistance to timeliness 220BH and its life
Product method, solves the problems, such as that yield strength 220MPa grades of cold rolling baking hardened steel ageing resistance of prior art production can be poor,
It is easy to the application of car industry.
The present invention is achieved in that according to an aspect of the invention, there is provided a kind of cold rolling baking of resistance to timeliness is hardened
Steel 220BH, by mass percentage, including following component, C：0.001%~0.003%, Si≤0.05%, Mn：0.35%~
0.80%th, P：0.035%~0.080%, S≤0.015%, Als：0.015%~0.060%, Nb：0.005%~
0.030%th, N≤0.0050%, Mo：0.01~0.08%, balance of iron and inevitable impurity.
According to another aspect of the present invention, there is provided the side of the above-mentioned cold rolling baking hardened steel of the resistance to timeliness 220BH of production
Method, comprises the following steps：
1) each component is mixed, is smelted by ultra-low-carbon steel method, pour into strand；
2) strand is placed in walking beam furnace and is heated, 1160~1230 DEG C of heating-up temperature；Strand is come out of the stove into horizontal high voltage
After water de-scaling, into roughing mill rolling, 1020 DEG C~1150 DEG C of start rolling temperature；Base temperature >=950 DEG C in the middle of after roughing, with laggard
Enter mm finishing mill unit rolling, 880~940 DEG C of finishing temperature；Batched after section cooling, 680~740 DEG C of coiling temperature；Cold continuous rolling is total
Reduction ratio is 65~90%；Continuous annealing, 830~870 DEG C of heating/holding temperature；680~760 DEG C of slow cooling temperature, rapid cooling outlet
Temperature 400~450, rapid cooling section cooling rate >=30 DEG C/s, 350~400 DEG C of overaging temperature；Smooth elongation percentage 0.5~1.20%, obtains
To the cold rolling baking hardened steel of resistance to timeliness 220BH.
Compared with prior art, the advantage of the invention is that：Using the cold rolling baking hardened steel of resistance to timeliness 220BH's of the invention
Production method, can be effectively improved baking hardened steel ageing resistance can (prior art production baking hardening rigidity high can guarantee that 3
Individual month), it is ensured that the ageing resistance energy of more than 6 months, the application requirement of car industry is better met, baking hardened steel is expanded in vapour
Application rate on car.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiment, to the present invention
It is further elaborated.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, it is not used to
Limit the present invention.
In order to solve the problems, such as that yield strength 220MPa grades of cold rolling baking hardened steel ageing resistance can be poor in the prior art, this
Invention provides a kind of cold rolling baking hardened steel of resistance to timeliness 220BH, by mass percentage, including following component, C：0.001%
~0.003%, Si≤0.05%, Mn：0.35%~0.80%, P：0.035%~0.080%, S≤0.015%, Als：
0.015%~0.060%, Nb：0.005%~0.030%, N≤0.0050%, Mo：0.01~0.08%, balance of iron and not
Evitable impurity.
Because phosphorus content is extremely low, make the steel grade that there is preferable elongation percentage, r values by high annealing, while improve again
Ageing resistance.Addition Nb mainly with C-shaped into NbC, its Precipitation Temperature be 830 DEG C or so, when annealing temperature be more than 830 DEG C when, NbC
It is decomposed into Nb and C atoms, high annealing and coordinating quickly is cooled down, in C atoms is there is crystal grain with solution,
So as to provide necessary condition for generation BH.Addition Mo be improved by short range atomic effect baking hardened steel it is resistance to when
Effect performance.On the one hand it is the deep drawability for ensureing baking hardened steel using high annealing, is sufficiently formed advantageous mechanisms, the opposing party
It is NbC is fully decomposed, subsequently coordinates fast-cooling technology, there is the form of C atoms solid solution in cold rolling finished product of decomposition, is
Good BH provides guarantee.Therefore, using Ultra-low carbon plus micro Nb, Mo element, the quick cooling technique of high annealing is coordinated,
Excellent forming property can be obtained, while the ageing resistance energy of more than 6 months.
Meanwhile, present invention also offers the method for the production cold rolling baking hardened steel of resistance to timeliness 220BH, produced according to this method
Steel, cold rolling end properties meet table 1 and require, and under conditions of storage at normal temperature, it is ensured that performance indications in 6 months after fabrication
(BH is not included2Value) also correspond to require that table 1 is required.
Table 1
Embodiment 1,
In the present embodiment, by mass percentage, the cold rolling baking hardened steel of resistance to timeliness 220BH includes following component：
C：0.001%~0.003%, Si：0.02%th, Mn：0.50%th, P：0.060%th, S：0.008%th, Als：
0.025%th, Nb：0.005%~0.030%, N：0.0022%th, Mo：0.01~0.08%, balance of iron is miscellaneous with inevitable
Matter.
In the present embodiment, the cold rolling baking hardened steel of resistance to timeliness 220BH production methods are as follows：
1) smelted by ultra-low-carbon steel method, pour into strand；
2) strand is placed in walking beam furnace and is heated, 1200 DEG C of heating-up temperature；Strand laggard horizontal high voltage water of coming out of the stove is removed
After squama, into roughing mill rolling；Base temperature >=950 DEG C in the middle of after roughing, subsequently enter mm finishing mill unit rolling, finishing temperature 900
℃；Batched after section cooling, 720 DEG C of coiling temperature；Cold continuous rolling total reduction is 75%；Continuous annealing, heating/holding temperature
845℃；730 DEG C of slow cooling temperature, 420 DEG C of rapid cooling outlet temperature, rapid cooling section cooling rate >=30 DEG C/s, 380 DEG C of overaging temperature；It is smooth
Elongation percentage 0.8%.After testing, the cold rolling baking hardened steel of the resistance to timeliness 220BH of the present embodiment production has following performance：Product is bent
Take intensity：232MPa, tensile strength 343MPa, elongation after fracture 41.7%, n values 0.23, r values 2.0, BH value 47MPa, normal temperature warp
After crossing storage in 6 months, strength fluctuation is within 10MPa, and elongation percentage, n values, r value changes trend is not obvious.
Embodiment 2
In the present embodiment, by mass percentage, the cold rolling baking hardened steel of resistance to timeliness 220BH includes following component：
C：0.001%~0.003%, Si：0.02%th, Mn：0.55%th, P：0.045%th, S：0.010%th, Als：
0.030%th, Nb：0.005%~0.030%, N：0.0024、Mo：0.01~0.08%, balance of iron is miscellaneous with inevitable
Matter.
In the present embodiment, the cold rolling baking hardened steel of resistance to timeliness 220BH production methods are as follows：
1) smelted by ultra-low-carbon steel method, pour into strand；
2) strand is placed in walking beam furnace and is heated, 1210 DEG C of heating-up temperature；Strand laggard horizontal high voltage water of coming out of the stove is removed
After squama, into roughing mill rolling；Base temperature >=950 DEG C in the middle of after roughing, subsequently enter mm finishing mill unit rolling, finishing temperature 900
℃；Batched after section cooling, 720 DEG C of coiling temperature；Cold continuous rolling total reduction is 70%；Continuous annealing, heating/holding temperature
840℃；740 DEG C of slow cooling temperature, 420 DEG C of rapid cooling outlet temperature, rapid cooling section cooling rate >=30 DEG C/s, 380 DEG C of overaging temperature；It is smooth
Elongation percentage 0.9%.After testing, the cold rolling baking hardened steel of the resistance to timeliness 220BH of the present embodiment production has following performance：Product is bent
Take intensity：229MPa, tensile strength 345MPa, elongation after fracture 40.5%, n values 0.22, r values 2.0, BH value 45MPa, normal temperature warp
After crossing storage in 6 months, strength fluctuation is within 10MPa, and elongation percentage, n values, r value changes trend is not obvious.
Comparative example：
By 6 months of the 220BH steel of conventional method production and the 220BH steel of the method production of present invention offer after dispatching from the factory
Test, as a result as shown in table 2：
Table 2
By compare it can be seen that present invention production the 220BH of resistance to timeliness products by after long-term placement, performance is bright
Aobvious fluctuation is smaller, and routine 220BH products the timeliness such as yield strength is raised, elongation percentage declines substantially occur and manifest.
Claims (2)
1. a kind of cold rolling baking hardened steel of resistance to timeliness 220BH, it is characterised in that by mass percentage, including following component, C：
0.001%~0.003%, Si≤0.05%, Mn：0.35%~0.80%, P：0.035%~0.080%, S≤0.015%,
Als：0.015%~0.060%, Nb：0.005%~0.030%, N≤0.0050%, Mo：0.01~0.08%, balance of iron
With inevitable impurity.
2. a kind of method for producing the cold rolling baking hardened steel of resistance to timeliness 220BH as claimed in claim 1, it is characterised in that bag
Include following steps：
1) each component is mixed, is smelted by ultra-low-carbon steel method, pour into strand；
2) strand is placed in walking beam furnace and is heated, 1160~1230 DEG C of heating-up temperature；Strand is come out of the stove and carries out water under high pressure and remove
After squama, into roughing mill rolling, 1020 DEG C~1150 DEG C of start rolling temperature；Base temperature >=950 DEG C, subsequently enter essence in the middle of after roughing
Milling train group is rolled, 880~940 DEG C of finishing temperature；Batched after section cooling, 680~740 DEG C of coiling temperature；Under cold continuous rolling stagnation pressure
Rate is 65~90%；Continuous annealing, 830~870 DEG C of heating/holding temperature；680~760 DEG C of slow cooling temperature, rapid cooling outlet temperature
400~450 DEG C, rapid cooling section cooling rate >=30 DEG C/s, 350~400 DEG C of overaging temperature；Smooth elongation percentage 0.5~1.20%, obtains
The cold rolling baking hardened steel of resistance to timeliness 220BH.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611177925.9A CN106702266A (en) | 2016-12-19 | 2016-12-19 | Ageing-resistant cold-rolled bake-hardening steel 220 BH and production method thereof |
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| CN201611177925.9A CN106702266A (en) | 2016-12-19 | 2016-12-19 | Ageing-resistant cold-rolled bake-hardening steel 220 BH and production method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107400829A (en) * | 2017-08-07 | 2017-11-28 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of ultra-low carbon baking hardening cold rolled steel sheet and preparation method thereof |
| CN111471925A (en) * | 2020-02-17 | 2020-07-31 | 本钢板材股份有限公司 | Low-cost ultra-wide automobile outer plate and preparation method thereof |
| CN113088635A (en) * | 2021-03-17 | 2021-07-09 | 东风汽车集团股份有限公司 | Bake-hardened steel and method for prolonging aging time of bake-hardened steel |
| CN114231845A (en) * | 2021-12-03 | 2022-03-25 | 本钢板材股份有限公司 | Cold-rolled deep-drawing high-strength steel with yield strength of 220Mpa and production method thereof |
| CN114262844A (en) * | 2021-12-03 | 2022-04-01 | 本钢板材股份有限公司 | Low-cost 220BH cold-rolled baking hardened steel 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 |
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| CN1386142A (en) * | 2000-08-04 | 2002-12-18 | 新日本制铁株式会社 | Cold rolled steel sheet and hot rolled steel sheet excellent in bake hardenability and resistance to ordinary temperatureaging and method for their production |
| CN103975082A (en) * | 2011-12-08 | 2014-08-06 | 杰富意钢铁株式会社 | Method for manufacturing high-strength cold-rolled steel sheet having excellent aging resistance and bake hardenability |
| CN104593674A (en) * | 2015-01-21 | 2015-05-06 | 首钢总公司 | Hot-dip galvanized ultra-low carbon bake-hardening steel and production method thereof |
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2016
- 2016-12-19 CN CN201611177925.9A patent/CN106702266A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1386142A (en) * | 2000-08-04 | 2002-12-18 | 新日本制铁株式会社 | Cold rolled steel sheet and hot rolled steel sheet excellent in bake hardenability and resistance to ordinary temperatureaging and method for their production |
| CN103975082A (en) * | 2011-12-08 | 2014-08-06 | 杰富意钢铁株式会社 | Method for manufacturing high-strength cold-rolled steel sheet having excellent aging resistance and bake hardenability |
| CN104593674A (en) * | 2015-01-21 | 2015-05-06 | 首钢总公司 | Hot-dip galvanized ultra-low carbon bake-hardening steel and production method thereof |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107400829A (en) * | 2017-08-07 | 2017-11-28 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of ultra-low carbon baking hardening cold rolled steel sheet and preparation method thereof |
| CN107400829B (en) * | 2017-08-07 | 2019-02-01 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of ultra-low carbon baking hardening cold rolled steel sheet and preparation method thereof |
| CN111471925A (en) * | 2020-02-17 | 2020-07-31 | 本钢板材股份有限公司 | Low-cost ultra-wide automobile outer plate and preparation method thereof |
| CN113088635A (en) * | 2021-03-17 | 2021-07-09 | 东风汽车集团股份有限公司 | Bake-hardened steel and method for prolonging aging time of bake-hardened steel |
| CN114231845A (en) * | 2021-12-03 | 2022-03-25 | 本钢板材股份有限公司 | Cold-rolled deep-drawing high-strength steel with yield strength of 220Mpa and production method thereof |
| CN114262844A (en) * | 2021-12-03 | 2022-04-01 | 本钢板材股份有限公司 | Low-cost 220BH cold-rolled baking hardened steel 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 |
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Application publication date: 20170524 |