CN114686665A - Anti-aging mild steel deep-drawing strip steel and production method thereof - Google Patents
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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
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- C21D8/0221—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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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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
- C22C38/001—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
- C22C38/04—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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Abstract
The invention discloses an anti-aging micro-carbon steel deep-drawing strip steel and a production method thereof, wherein the anti-aging micro-carbon steel deep-drawing strip steel is prepared from the following raw materials in percentage by mass: c: 0.010-0.025%, Si: less than or equal to 0.05 percent, Mn: 0.10-0.25%, P is less than or equal to 0.025%, S is less than or equal to 0.015%, Al: 0.020-0.060 percent, N is less than or equal to 0.0040 percent, and the balance is iron and inevitable impurities, the anti-aging micro-carbon deep drawing steel and the method thereof adopt a micro-carbon steel component system, solid solution carbon can be precipitated in crystal and grain boundaries during continuous annealing cooling, so that the ratio of the solid solution carbon is less, but when the carbon content is lower, the solid solution carbon can be only precipitated in the grain boundaries during cooling, the content of the solid solution carbon which is not precipitated is far more than that of carbides precipitated in the grain boundaries, so that the final solid solution carbon content of the material is very high, and the solid solution carbon can be precipitated during aging; the yield strength is 140-190MPa, the tensile strength is 310-360MPa, and the elongation A80 is more than or equal to 40 percent; the invention has the characteristics of low production cost, good surface quality, excellent product performance, good anti-aging performance, good punch forming and simple process.
Description
Technical Field
The invention belongs to the technical field of micro-carbon steel production, and particularly relates to an anti-aging micro-carbon steel deep-drawing strip steel and a production method thereof.
Background
Deep-drawing steel, which has excellent formability and excellent property uniformity, is interstitial-free steel having a very low carbon content and to which alloy stabilizing elements are added, and is a steel in which an aging phenomenon does not occur.
The micro-carbon deep drawing steel is the more typical, economical and practical deep drawing steel used at present, and is developed by further reducing carbon and purifying steel on the basis of the traditional low-carbon aluminum killed deep drawing steel. The method is mainly applied to the field of automobile and household appliance manufacturing.
Because the steel does not contain strong carbonitride forming elements, obvious aging phenomenon often occurs in the using process of products, the strength of the steel is increased, the stamping forming difficulty is increased, the defects of folds, tensile strain marks and the like are easy to occur, and the subsequent coating effect is seriously influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an anti-aging mild steel deep drawing strip steel and a production method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
an anti-aging mild steel deep-drawing strip steel and a production method thereof are prepared from the following raw materials in percentage by mass: c: 0.010-0.025%, Si: less than or equal to 0.05 percent, Mn: 0.10-0.25%, P is less than or equal to 0.025%, S is less than or equal to 0.015%, Al: 0.020-0.060%, N is less than or equal to 0.0040%, and the balance is iron and inevitable impurities.
Preferably, the composition is prepared from the following raw materials in percentage by mass: c: 0.010-0.020%, Si: less than or equal to 0.05 percent, Mn: 0.10-0.20%, P is less than or equal to 0.023%, S is less than or equal to 0.012%, Al: 0.020-0.050%, N less than or equal to 0.0040%, and the balance of iron and inevitable impurities.
Preferably, the yield strength of the anti-aging micro-carbon deep-drawing strip steel is 140-190MPa, the tensile strength is 310-360MPa, the elongation A80 is more than or equal to 40%, and the thickness of the anti-aging micro-carbon deep-drawing strip steel is 0.40-2.00 mm.
Preferably, the method for manufacturing the anti-aging mild steel deep drawing strip steel comprises the following specific steps:
(S1) smelting:
selecting raw materials according to the mass percentage, and smelting in a converter;
(S2), and continuous casting:
continuously casting molten iron smelted by the converter;
(S3) hot continuous rolling
Heating and continuously rolling the plate blank formed by continuous casting;
(S4) acid continuous rolling
Carrying out acid pickling continuous rolling on the plate blank after hot continuous rolling;
(S5) continuous annealing step
And (3) adopting a continuous annealing process after acid continuous rolling to obtain the micro-carbon steel deep-drawing strip steel.
Preferably, the raw materials are selected in the step (S1) according to the mass percentage, the raw materials are selected through a pretreatment process of molten iron, then converter smelting is carried out, S is required to be less than or equal to 0.010% at the blowing end point of the converter smelting process, and the end point temperature is controlled to be more than or equal to 1600 ℃.
Preferably, in the step (S1), the LF refining is heated, and the outlet temperature is controlled at 1610-; the RH refining net cycle time is more than or equal to 8min, the components meet the target requirements of finished products, the outlet temperature is controlled at 1580-1595 ℃, and calcium treatment is not carried out.
Preferably, in the continuous casting step (S2), the continuous casting mold and the secondary cooling are strongly cooled, the water amount on the wide surface of the mold is 4450-4500L/min, the water amount on the narrow surface is 450-500L/min, and the water amount on the secondary cooling is 0.91 kg/t.
Preferably, in the step (S3) of hot rolling, the heating temperature is 1210-.
Preferably, in the hot rolling step (S4), the total reduction ratio in the acid continuous rolling step is 75 to 80%.
Preferably, in the step (S5) of cold continuous rolling, the heating soaking temperature is controlled at 830 ℃ and the belt speed is controlled at 300mpm and the flat elongation is controlled at 0.8-1.6% according to different thickness specifications.
1. According to the anti-aging micro-carbon deep drawing steel and the method thereof provided by the invention, a micro-carbon steel component system is adopted, solid solution carbon can be precipitated in crystal and grain boundaries during continuous annealing and cooling, so that the solid solution carbon is less, but when the carbon content is lower, the solid solution carbon can be only precipitated in the grain boundaries during cooling, the content of the solid solution carbon which is not precipitated is far more than that of carbides precipitated in the grain boundaries, so that the final solid solution carbon content of the material is very high, and the solid solution carbon can be precipitated in the aging process.
2. The anti-aging micro-carbon deep drawing steel produced by the method has reasonable matching degree of strength, toughness and wear resistance, the yield strength is 140-.
3. The invention and the method thereof have the characteristics of low production cost, good surface quality, excellent product performance, good anti-aging performance, good punch forming and simple process.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Detailed Description
The following further describes a specific embodiment of the anti-aging mild steel deep-drawing strip steel and the production method thereof with reference to the attached drawing 1. The anti-aging mild steel deep-drawing strip steel and the production method thereof are not limited to the description of the following examples.
Example 1:
the thickness specification of the anti-aging micro-carbon deep drawing steel produced by the embodiment is 0.50 mm.
The embodiment provides an anti-aging mild steel deep-drawing strip steel and a production method thereof, and the anti-aging mild steel deep-drawing strip steel is prepared from the following raw materials in percentage by mass: c: 0.015%, Si: 0.02%, Mn: 0.17%, P: 0.015%, S: 0.008%, Al: 0.035%, and the balance of iron and inevitable impurities.
A manufacturing method of anti-aging micro-carbon steel deep drawing strip steel comprises the following specific steps:
(S1) smelting:
selecting raw materials according to the mass percentage, namely selecting the raw materials by a molten iron pretreatment process, and then carrying out converter smelting, wherein the blowing end point of the converter smelting process requires S: 0.008 percent and the end point temperature is controlled at 1635 ℃;
heating the LF refining, and controlling the outbound temperature at 1635 ℃;
the RH refining net circulation time is 12min, and the outbound temperature is controlled to be 1590 ℃.
(S2), and continuous casting:
the continuous casting crystallizer and the secondary cooling adopt strong cooling, the water quantity of the wide surface of the crystallizer is 4455L/min, the water quantity of the narrow surface of the crystallizer is 465L/min, and the water quantity of the secondary cooling is 0.91 kg/t.
(S3) hot continuous rolling
The heating temperature is 1250 ℃, the rough rolling temperature is 1055 ℃, the final rolling temperature is 920 ℃, and the coiling temperature is 712 ℃.
(S4) acid continuous rolling
In the acid continuous rolling process, the total reduction rate is 78%.
(S5) continuous annealing step
In the cold continuous rolling process, the heating soaking temperature is controlled at 815 ℃, the belt speed is controlled at 280mpm, and the leveling elongation is controlled at 0.8%.
The detection result of the steel strip with the thickness of 0.50mm obtained in the embodiment is as follows: the tensile strength was 165MPa, the tensile strength was 325MPa, and the elongation A80 was 42.5%.
Example 2:
the thickness specification of the anti-aging micro-carbon deep drawing steel produced by the embodiment is 0.89 mm.
The embodiment provides an anti-aging mild steel deep-drawing strip steel and a production method thereof, and the anti-aging mild steel deep-drawing strip steel is prepared from the following raw materials in percentage by mass: c: 0.012%, Si: 0.01%, Mn: 0.16%, P: 0.020%, S: 0.005%, Al: 0.032%, and the balance of iron and inevitable impurities.
A manufacturing method of anti-aging micro-carbon steel deep drawing strip steel comprises the following specific steps:
(S1) smelting:
selecting raw materials according to the mass percentage, namely selecting the raw materials by a molten iron pretreatment process, and then carrying out converter smelting, wherein the blowing end point of the converter smelting process requires S: 0.004 percent, and the end point temperature is controlled at 1638 ℃;
heating the LF refining, and controlling the outbound temperature at 1645 ℃;
the RH refining net circulation time is 13min, and the outbound temperature is controlled at 1585 ℃.
(S2), and continuous casting:
the continuous casting crystallizer and the secondary cooling adopt strong cooling, the water quantity of the wide surface of the crystallizer is 4465L/min, the water quantity of the narrow surface of the crystallizer is 460L/min, and the water quantity of the secondary cooling is 0.91 kg/t.
(S3) hot continuous rolling
The heating temperature is 1255 ℃, the rough rolling temperature is 1052 ℃, the final rolling temperature is 922 ℃ and the coiling temperature is 715 ℃.
(S4) acid continuous rolling
In the acid continuous rolling process, the total reduction rate is 76%.
(S5) continuous annealing step
In the cold continuous rolling procedure, the heating soaking temperature is controlled at 825 ℃, the belt speed is controlled at 240mpm, and the flat elongation is controlled at 1.20%.
The detection result of the steel strip with the thickness of 0.50mm obtained in the embodiment is as follows: the tensile strength was 160MPa, the tensile strength was 318MPa, and the elongation A80 was 43.0%.
Example 3:
the thickness specification of the anti-aging micro-carbon deep drawing steel produced by the embodiment is 1.50 mm.
The embodiment provides an anti-aging mild steel deep-drawing strip steel and a production method thereof, and the anti-aging mild steel deep-drawing strip steel is prepared from the following raw materials in percentage by mass: c: 0.012%, Si: 0.01%, Mn: 0.17%, P: 0.015%, S: 0.006%, Al: 0.035%, and the balance of iron and inevitable impurities.
A manufacturing method of anti-aging micro-carbon steel deep drawing strip steel comprises the following specific steps:
(S1) smelting:
selecting raw materials according to the mass percentage, namely selecting the raw materials by a molten iron pretreatment process, and then carrying out converter smelting, wherein the blowing end point of the converter smelting process requires S: 0.007 percent and the end point temperature is controlled to be 1645 ℃;
heating the LF refining, and controlling the outbound temperature to 1655 ℃;
the RH refining net circulation time is 15min, and the outbound temperature is controlled to be 1593 ℃.
(S2), and continuous casting:
the continuous casting crystallizer and the secondary cooling adopt strong cooling, the water quantity of the wide surface of the crystallizer is 4450L/min, the water quantity of the narrow surface of the crystallizer is 460L/min, and the water quantity of the secondary cooling is 0.91 kg/t.
(S3) hot continuous rolling
The heating temperature is 1258 ℃, the rough rolling temperature is 1060 ℃, the final rolling temperature is 925 ℃ and the coiling temperature is 725 ℃.
(S4) acid continuous rolling
In the acid continuous rolling process, the total reduction rate is 71%.
(S5) continuous annealing step
In the cold continuous rolling procedure, the heating soaking temperature is controlled at 825 ℃, the belt speed is controlled at 180mpm, and the flat elongation is controlled at 1.50%.
The detection result of the steel strip with the thickness of 0.50mm obtained in the embodiment is as follows: tensile strength of 155MPa, tensile strength of 315MPa, and elongation A80 of 45.0%.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. An anti-aging mild steel deep drawing strip steel is characterized in that: the composite material is prepared from the following raw materials in percentage by mass: c: 0.010-0.025%, Si: less than or equal to 0.05 percent, Mn: 0.10-0.25%, P is less than or equal to 0.025%, S is less than or equal to 0.015%, Al: 0.020-0.060%, N is less than or equal to 0.0040%, and the balance is iron and inevitable impurities.
2. The anti-aging mild steel deep drawing strip steel as claimed in claim 1, characterized in that: the composite material is prepared from the following raw materials in percentage by mass: c: 0.010-0.020%, Si: less than or equal to 0.05 percent, Mn: 0.10-0.20%, P is less than or equal to 0.023%, S is less than or equal to 0.012%, Al: 0.020-0.050%, N less than or equal to 0.0040%, and the balance of iron and inevitable impurities.
3. The anti-aging mild steel deep-drawing strip steel as claimed in any one of claims 1 to 2, wherein: the yield strength of the anti-aging micro-carbon deep-drawing strip steel is 140-190MPa, the tensile strength is 310-360MPa, the elongation A80 is more than or equal to 40%, and the thickness of the anti-aging micro-carbon deep-drawing strip steel is 0.40-2.00 mm.
4. The method for manufacturing the anti-aging micro-carbon steel deep drawing strip steel as claimed in the claims 1-2, characterized in that: the method comprises the following specific steps:
(S1), smelting:
selecting raw materials according to mass percentage, and smelting in a converter;
(S2), and continuous casting:
continuously casting molten iron smelted by the converter;
(S3) hot continuous rolling
Heating and continuously rolling the plate blank formed by continuous casting;
(S4) acid continuous rolling
Carrying out acid pickling continuous rolling on the plate blank after hot continuous rolling;
(S5) continuous annealing step
And (3) adopting a continuous annealing process after acid continuous rolling to obtain the micro-carbon steel deep-drawing strip steel.
5. The method for manufacturing the anti-aging micro carbon steel deep drawing strip steel as claimed in claim 4, wherein the method comprises the following steps: in the step (S1), the raw materials are selected according to the mass percentage by carrying out a pretreatment process on molten iron, and then smelting in a converter, wherein S is required to be less than or equal to 0.010% at the blowing end point of the smelting process of the converter, and the end point temperature is controlled to be more than or equal to 1600 ℃.
6. The method for manufacturing the anti-aging micro carbon steel deep drawing strip steel as claimed in claim 4, wherein the method comprises the following steps: in the step (S1), the LF refining is heated, and the outlet temperature is controlled at 1610-; the RH refining net cycle time is more than or equal to 8min, the components meet the target requirements of finished products, the outlet temperature is controlled at 1580-1595 ℃, and calcium treatment is not carried out.
7. The method for manufacturing the anti-aging micro carbon steel deep drawing strip steel as claimed in claim 4, wherein the method comprises the following steps: in the step (S2) of continuous casting, the continuous casting mold and the secondary cooling are strongly cooled, the water amount on the wide surface of the mold is 4450-4500L/min, the water amount on the narrow surface is 450-500L/min, and the water amount of the secondary cooling is 0.91 kg/t.
8. The method for manufacturing the anti-aging micro carbon steel deep drawing strip steel as claimed in claim 4, wherein the method comprises the following steps: in the step (S3), in the hot rolling process, the heating temperature is 1210-.
9. The method for manufacturing the anti-aging micro carbon steel deep drawing strip steel as claimed in claim 4, wherein the method comprises the following steps: in the hot rolling step (S4), the total reduction ratio in the acid continuous rolling step is 75 to 80%.
10. The method for manufacturing the anti-aging micro carbon steel deep drawing strip steel as claimed in claim 4, wherein the method comprises the following steps: in the step (S4) of the cold continuous rolling process, the heating and soaking temperature is controlled at 830 ℃ at 160 ℃ at 300mpm and the flat elongation is controlled at 0.8-1.6% according to different thickness specifications.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3020883A1 (en) * | 1980-06-02 | 1981-12-10 | Nippon Steel Corp., Tokyo | Cold rolled, continuously annealed steel strip - contains controlled ratio of boron and nitrogen producing excellent deep drawing properties after hot and cold rolling |
| KR20120049994A (en) * | 2010-11-10 | 2012-05-18 | 주식회사 포스코 | Method for manufacturing tensile strength 590mpa class cold rolled trip steel with excellent variation of mechanical property |
| CN102758132A (en) * | 2012-06-19 | 2012-10-31 | 河北钢铁股份有限公司邯郸分公司 | Method for manufacturing deep-drawing steel with high r value through continuous annealing of micro-carbon aluminum killed steel |
| CN105256223A (en) * | 2015-11-12 | 2016-01-20 | 首钢总公司 | Micro-carbon steel with low yield strength and production method thereof |
| CN105256224A (en) * | 2015-11-11 | 2016-01-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Cold-rolled micro carbon steel strip for oil heater and preparation method of steel strip |
| US20220389534A1 (en) * | 2019-09-19 | 2022-12-08 | Baoshan Iron & Steel Co., Ltd. | Nb microalloyed high strength high hole expansion steel and production method therefor |
-
2022
- 2022-03-16 CN CN202210257135.0A patent/CN114686665A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3020883A1 (en) * | 1980-06-02 | 1981-12-10 | Nippon Steel Corp., Tokyo | Cold rolled, continuously annealed steel strip - contains controlled ratio of boron and nitrogen producing excellent deep drawing properties after hot and cold rolling |
| KR20120049994A (en) * | 2010-11-10 | 2012-05-18 | 주식회사 포스코 | Method for manufacturing tensile strength 590mpa class cold rolled trip steel with excellent variation of mechanical property |
| CN102758132A (en) * | 2012-06-19 | 2012-10-31 | 河北钢铁股份有限公司邯郸分公司 | Method for manufacturing deep-drawing steel with high r value through continuous annealing of micro-carbon aluminum killed steel |
| CN105256224A (en) * | 2015-11-11 | 2016-01-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Cold-rolled micro carbon steel strip for oil heater and preparation method of steel strip |
| CN105256223A (en) * | 2015-11-12 | 2016-01-20 | 首钢总公司 | Micro-carbon steel with low yield strength and production method thereof |
| US20220389534A1 (en) * | 2019-09-19 | 2022-12-08 | Baoshan Iron & Steel Co., Ltd. | Nb microalloyed high strength high hole expansion steel and production method therefor |
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