CN113549736B - Technological method for stably controlling baking hardening steel BH2 - Google Patents
Technological method for stably controlling baking hardening steel BH2 Download PDFInfo
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- CN113549736B CN113549736B CN202110689851.1A CN202110689851A CN113549736B CN 113549736 B CN113549736 B CN 113549736B CN 202110689851 A CN202110689851 A CN 202110689851A CN 113549736 B CN113549736 B CN 113549736B
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
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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
- C21D11/00—Process control or regulation for heat treatments
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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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%
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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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- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention relates to the technical field of production and processing of automobile outer plates, in particular to a process method for stably controlling bake-hardening steel BH2, which comprises the following steps: s1, detecting the carbon content; s2, controlling the speed of a production line to be 63-124m/min according to the carbon content; s3, controlling the dew point temperature to be (-41 ℃ and (-16 ℃) according to the carbon content; the BH2 value is stably controlled within the range of 30-50MPa, preferably 31-35MPa, the production line speed and the dew point temperature of the production process are regulated and controlled through detected different carbon contents to ensure that the BH2 value is within the optimal range, so that the long and short wave data and the intensity are not influenced, and the strength improvement requirement after baking and hardening is met while the product meets the requirement of customer painting.
Description
Technical Field
The invention relates to the technical field of hardened steel production and processing, in particular to a process method for stably controlling baking hardened steel BH 2.
Background
At present, the floating coat-free process generally adds the function of a floating coat layer into a colored paint layer, and combines the floating coat layer and the colored paint layer into a coating layer, so that the VOC emission can be reduced, and the cost can be reduced. As for the floating coat-free process, a dupont process, an IP double-ground process by BASF, a B1B2 process by PPG, and the like are common.
With the development of the automobile industry, more and more automobile users put forward the waviness requirement to meet the subsequent painting requirement of the floating coat-free process. When the BH2 value is high, more solid solution carbon atoms are in the substrate, a large amount of movable dislocation is generated during stamping, through baking, the thermal activation energy of the solid solution carbon atoms is increased, the solid solution carbon atoms are diffused to the dislocation position to form a Coriolis gas mass through nail rolling, the nail rolling action of the solid solution carbon atoms can generate uneven deformation during stamping, and a steel plate has serious surface texture after paint spraying, so that long and short wave data and surface quality are influenced; the BH2 value is low, the effect of improving the strength after baking cannot be achieved, but the existing BH2 value control process cannot be reasonably controlled according to the carbon content, a differential process is not designed, the ideal BH2 value cannot be achieved, and the reasonable and stable BH2 control is particularly important.
Disclosure of Invention
In order to solve the technical problem, an embodiment of the present invention provides a process method for stably controlling bake-hardening steel BH2, including the following processes:
s1, detecting the carbon content;
s2, controlling the speed of a production line to be 63-124m/min according to the carbon content;
s3, controlling the dew point temperature to be (-41 ℃ and-16 ℃) according to the carbon content;
the BH2 value is stably controlled within the range of 30-50MPa, and 31-35MPa is preferred.
Through the technical scheme, the production line speed and the dew point temperature are controlled according to different carbon contents after the carbon content is detected, so that the BH2 value is stably controlled in the most reasonable range, and the BH2 value is not too high or too low to influence the long-short wave data and the intensity.
Further preferably, the production line speed is 90-110m/min.
Through the technical scheme, the BH2 value can be better enabled to be within the preferable range of 31-35MPa by controlling the production line speed within the range, and the BH2 value is not within the range of 31-35MPa when the production line speed is lower than 90m/min and higher than 110 according to practical experience.
Further preferably, the dew point temperature is (-38 ℃, -23 ℃).
Through the technical scheme, the dew point temperature is controlled in the range, so that the BH2 value can be better in the preferable range of 31-35MPa, and the BH2 value is less than 31-35MPa when the dew point temperature is not in the range according to practical experience.
Further preferably, the heating temperature in the annealing furnace is 810-837 ℃, the temperature also has an influence on the BH2 value, too low temperature solid solution carbon atoms have less pinning when being diffused to dislocation parts during high temperature baking, and a better baking hardening value cannot be ensured, if too high temperature NbC is redissolved in a high temperature process, too much carbon is diffused to the dislocation parts to form strong pinning to form a Coriolis gas group, so that the deformation unevenness of the material in a stamping process causes surface texture influence on the appearance effect after painting.
Further preferably, the steel comprises the following chemical components in percentage by mass: less than or equal to 0.003 percent; si:0.04 to 0.06 percent; mn:0.1 to 0.17 percent; p:0.015% -0.025%; s: less than or equal to 0.008 percent; ti:0.007 to 0.014 percent; nb: less than or equal to 0.005 percent; and Als:0.025 percent to 0.045 percent; n: less than or equal to 0.003 percent.
The bake hardening performance is a result of interaction of interstitial atoms C and N and dislocation formed in the punch forming process, except C and N, N is mainly combined with Als and Ti, and the N is used for independently stabilizing part C.
Further preferably, the steel comprises the following chemical components in percentage by mass: 0.0025 percent; si:0.05 percent; mn:0.14 percent; p:0.02 percent; s:0.006%; ti:0.001 percent; nb:0.003%; and Als:0.03 percent; n:0.002%, and the optimal component percentage obtained according to practice, the steel plate has stable proportioning performance and the BH2 value is easier to control.
The invention has the beneficial effects that:
the production line speed and the dew point temperature of the production process are regulated and controlled through detected different carbon contents to ensure that the BH2 value is in an optimal range, so that the long and short wave data and the strength are not influenced, and the strength improvement requirement after baking and hardening is met while the product meets the customer painting requirement.
Detailed Description
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
A process method for stably controlling bake-hardening steel BH2 comprises the following processes:
s1, detecting the carbon content;
s2, controlling the speed of a production line to be 63-124m/min according to the carbon content;
s3, controlling the dew point temperature to be (-41 ℃ and (-16 ℃) according to the carbon content;
the BH2 value is stably controlled within the range of 30-50MPa, and 31-35MPa is preferred.
After the carbon content is detected, the speed and the dew point temperature of the production line are controlled according to different carbon contents, so that the BH2 value is stably controlled in the most reasonable range, and the BH2 value is not too high or too low to influence the long and short wave data and the intensity.
In some preferred embodiments, the line speed is 90-110m/min, and controlling the line speed in this range will preferably result in a BH2 value in the preferred range of 31-35MPa, as empirically determined, BH2 values outside the range of 31-35MPa when the line speed is below 90m/min and above 110.
In some preferred embodiments, a dew point temperature of (-38 deg.C, -23 deg.C) to control the dew point temperature within this range will better result in a BH2 value within the preferred range of 31-35MPa, and experience has shown that BH2 values of less than 31-35MPa should be used when the dew point temperature is outside this range.
In the embodiment, the heating temperature in the annealing furnace is 810-837 ℃, the temperature also has an influence on the BH2 value, the pinning of the carbon atoms with excessively low solid solution diffused to the dislocation position when the carbon atoms are baked at high temperature is less, and a better baking hardening value cannot be ensured, if the NbC with excessively high temperature is redissolved in the high-temperature process, the carbon atoms are diffused to the dislocation position to form strong pinning to form a Coriolis gas group, so that the deformation and the unevenness of the material in the stamping process cause the influence of the surface texture on the appearance effect after painting.
In some preferred embodiments, the steel plate comprises the following chemical components in percentage by mass: less than or equal to 0.003 percent; si:0.04 to 0.06 percent; mn:0.1 to 0.17 percent; p:0.015% -0.025%; s: less than or equal to 0.008 percent; ti:0.007 to 0.014 percent; nb: less than or equal to 0.005 percent; and (3) Als:0.025 percent to 0.045 percent; n: less than or equal to 0.003 percent.
The bake hardening performance is the result of the interaction of interstitial atoms C and N and dislocation formed in the punch forming process, except C and N, ti is used for fixing N and S in raw material components to form Ti compounds of N and S, in addition, N is mainly combined with Als and Ti, and a part C is independently stabilized by N.
Further preferably, the steel plate comprises the following chemical components in percentage by mass: 0.0025%; si:0.05 percent; mn:0.14 percent; p:0.02 percent; s:0.006%; ti:0.001 percent; nb:0.003%; and (3) Als:0.03 percent; n:0.002%, and the optimal component percentage obtained according to practice, the steel plate has stable proportioning performance and the BH2 value is easier to control.
Through multi-round tests, key influence factors of the BH2 value are found, namely the production line speed and the in-furnace humidification (namely the control of the dew point temperature)
When the upper table is different carbon contents, the production line speed at different stages corresponds to the controlled dew point temperature, the dew point temperature outside the mark is the target optimal dew point temperature, and the dew point temperature is controlled by differentially setting the heating section dew point temperature in the furnace aiming at different solid solution carbon contents of raw materials, namely controlling the humidifier to control the dew point temperature, so as to accurately control the BH2 value, and obtaining the following control method according to practical experience:
(1) when BH2 is pasted with an upper limit or a lower limit, the prior RTH2 dew point reference result is adjusted correspondingly to the upper limit and the lower limit; if the adjustment is carried out within the control range of the RTH2 dew point and the BH2 cannot be controlled within the target range, the RTH2 dew point can exceed the given range for control, so that the BH2 is controlled within the target range;
(2) the temperature of the RTH2 strip steel is increased, the BH2 value is reduced, and the reverse is true;
(3) increasing the production line speed, the BH2 value will increase, and vice versa.
The technological method of the invention realizes the obvious improvement of BH2 value control stability, avoids successful test production of the floating coat product, and supplies a plurality of host factories.
In the description of the present specification, reference to the description of "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In view of the foregoing, it is intended that the present invention cover the preferred embodiment of the invention and not be limited thereto, but that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (6)
1. A process method for stably controlling baking hardening steel BH2 is characterized by comprising the following steps: the method comprises the following steps:
s1, detecting the carbon content;
s2, controlling the speed of a production line to be 63-124m/min according to the carbon content;
s3, controlling the dew point temperature to be between-41 ℃ and-16 ℃ according to the carbon content;
stably controlling the BH2 value to be 31-35MPa, wherein the corresponding production line speed and dew point temperature control data are as follows;
2. the process method for stably controlling the bake hardening steel BH2 according to claim 1, characterized in that: the production line speed is 90-110m/min.
3. The process method for stably controlling the bake hardening steel BH2 according to claim 1, characterized in that: the production line speed and dew point temperature control data are as follows;
4. the process for stably controlling bake hardening steel BH2 according to claim 2 or 3, characterized in that: the heating temperature in the annealing furnace is 810-837 ℃.
5. The process method for stably controlling the bake hardening steel BH2 according to claim 4, characterized in that: the steel comprises the following chemical components in percentage by mass: less than or equal to 0.003 percent; si:0.04 to 0.06 percent; mn:0.1 to 0.17 percent; p:0.015% -0.025%; s: less than or equal to 0.008 percent; ti:0.007% -0.014%; nb: less than or equal to 0.005 percent; and Als:0.025 percent to 0.045 percent; n: less than or equal to 0.003 percent.
6. The process method for stably controlling the bake hardening steel BH2 according to claim 5, characterized in that: the steel comprises the following chemical components in percentage by mass: 0.0025 percent; si:0.05 percent; mn:0.14 percent; p:0.02 percent; s:0.006%; ti:0.001 percent; nb:0.003%; and (3) Als:0.03 percent; n:0.002%.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5591929A (en) * | 1978-12-29 | 1980-07-11 | Nippon Steel Corp | Method and facility for continuous annealing of cold rolled steel strip |
| CN106480305A (en) * | 2015-08-24 | 2017-03-08 | 鞍钢股份有限公司 | Production method for improving decarburization efficiency of cold-rolled electrical steel |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5656102A (en) * | 1996-02-27 | 1997-08-12 | Bethlehem Steel Corporation | Bake hardenable vanadium containing steel and method thereof |
| JP2007270167A (en) * | 2006-03-30 | 2007-10-18 | Jfe Steel Kk | Method for producing galvanized steel sheet excellent in baking hardenability |
| CN104109814B (en) * | 2014-08-08 | 2016-05-04 | 鞍钢蒂森克虏伯汽车钢有限公司 | One has flanging property cold-rolled galvanized duplex steel plate and manufacture method |
| CN109440006B (en) * | 2018-11-22 | 2020-11-03 | 唐山钢铁集团有限责任公司 | Baking hardened steel for automobile outer plate and production method thereof |
| CN111101067A (en) * | 2020-02-06 | 2020-05-05 | 鞍钢蒂森克虏伯汽车钢有限公司 | Hot-dip galvanized steel plate with stable baking hardening performance and production method thereof |
| 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 |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5591929A (en) * | 1978-12-29 | 1980-07-11 | Nippon Steel Corp | Method and facility for continuous annealing of cold rolled steel strip |
| CN106480305A (en) * | 2015-08-24 | 2017-03-08 | 鞍钢股份有限公司 | Production method for improving decarburization efficiency of cold-rolled electrical steel |
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