CN105256223A - Micro-carbon steel with low yield strength and production method thereof - Google Patents
Micro-carbon steel with low yield strength and production method thereof Download PDFInfo
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- CN105256223A CN105256223A CN201510772763.2A CN201510772763A CN105256223A CN 105256223 A CN105256223 A CN 105256223A CN 201510772763 A CN201510772763 A CN 201510772763A CN 105256223 A CN105256223 A CN 105256223A
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Abstract
The invention discloses micro-carbon steel with low yield strength and a production method thereof, and belongs to the technical field of a micro-carbon steel production process. The micro-carbon steel with low yield strength is characterized by comprising the following chemical components in percentage by mass: 0.015-0.025% of C, less than or equal to 0.01% of Si, 0.1-0.2% of Mn, less than or equal to 0.01% of P, less than or equal to 0.01% of S, 0.0015-0.0030% of B, and the balance of Fe and inevitable impurities; size of cold roll crystal grains of the micro-carbon steel reaches level 8.5; and the micro-carbon steel has steel yield strength lower than 180 MPa and elongation after fracture A80 greater than or equal to 40%. According to the the invention, performance of the micro-carbon steel with low yield strength is comparable with that of cold-rolled automotive steel; and a steel plate has a low price and strong competitiveness.
Description
Technical field
The present invention relates to micro-carbon steel sheet technical field of producing, particularly a kind of micro-carbon steel and production method thereof with low yield strength.
Background technology
Micro-carbon steel is the middle product between soft steel and ultra low-carbon steel, and it has the mechanical property close to ultra low-carbon steel, simultaneously cost control in soft steel level, for user low yield strength need alternative ultra low-carbon steel, have good market outlook.
At present on the market of cold rolled automobile steel, client is in order to ensure punching performance, propose the demand of low yield strength, be mainly used in the positions such as crossbeam/mounting plate/top cover after its punching press, and steel mill is the requirement meeting user, general employing ultra low-carbon steel is produced, through RH refining depth decarburization, add the fixation of C/atom N such as Ti/Nb alloy, performance exists significantly rich, steel plate is on the high side, and competitive power is not obvious.
Summary of the invention
The invention provides a kind of micro-carbon steel and the production method thereof with low yield strength, solving or partly solve cold rolled automobile steel in prior art adopts ultra low-carbon steel to produce, add the fixation of C/atom N such as Ti/Nb alloy, performance exists significantly rich, steel plate is on the high side, the unconspicuous technical problem of competitive power.
For solving the problems of the technologies described above, the invention provides a kind of micro-carbon steel with low yield strength, the chemical quality per-cent of described micro-carbon steel is: C:0.015-0.025%, Si≤0.01%, Mn:0.1-0.2%, P≤0.01%, S≤0.01%, B:0.0015-0.0030%, all the other are Fe and inevitable impurity, the cold rolling coil grain-size of described micro-carbon steel reaches 8.5 grades, steel yield strength < 180MPa, elongation after fracture A80 >=40%.
Based on identical inventive concept, the present invention also provides a kind of production method with micro-carbon steel of low yield strength to comprise after hot metal pretreatment, and after top and bottom combined blown converter smelting, RH refining obtain the molten steel of micro-carbon steel, continuous casting obtains slab; After being heated by described slab, carry out roughing to described slab, use coiled sheet case before finish rolling, finish rolling obtains hot-rolled sheet, and finishing temperature control is at 890 ~ 930 DEG C, and oiler temperature control is at 680 ~ 730 DEG C; Through overpickling, cold rolling, annealing and flattening process obtain micro-carbon steel cold rolling coil.
Further, add ferro-boron in described RH refining process, guarantee B > 0.0015%.
Further, use coiled sheet case to comprise before described finish rolling and adopt sparse cooling mode to be cooled to coiling temperature described hot-rolled sheet, the cold process of layer is opened U-shaped and is batched pattern simultaneously, and band steel toe tail 30 meters of exceed target coiling temperature 30 DEG C; Withdrawal roll pressure < 15KN in coiling process, adopts band steel toe tail clamping middle part to lift pattern.
Further, the soaking temperature of described band steel setting annealing furnace is controlled at 800 ~ 830 DEG C; Smooth elongation control is at 0.5-1.5%.
Further, the microscopic metallographic structure of described micro-carbon steel cold rolling coil is ferrite+carbide.
Micro-carbon steel with low yield strength provided by the invention adopts B element coarsened grain, reduce steel grade C content, pure steel grade S, the elements such as P, adopt the mode alligatoring hot rolled ferrite crystal grain of high temperature coiling simultaneously, the high temperature annealing that the company of utilization moves back obtains the discrete carbide particle that evenly thick polygonal ferrite adds crystal boundary distribution, the micro-carbon steel cold rolling coil grain-size obtained reaches 8.5 grades, steel yield strength < 180MPa, elongation after fracture A80 >=40%, poor mechanical property with steel head, middle and end is no more than 10MPa, performance reaches cold rolled automobile steel, steel plate is on the low side, competitive power is strong.
Accompanying drawing explanation
The schema with the production method of micro-carbon steel of low yield strength that Fig. 1 provides for the embodiment of the present invention;
The microtexture schematic diagram with micro-carbon steel of low surrender degree that Fig. 2 provides for the embodiment of the present invention;
The metallographic structure schematic diagram of the interpolation B element that Fig. 3 provides for the embodiment of the present invention.
Embodiment
See Fig. 2, a kind of micro-carbon steel with low yield strength that the embodiment of the present invention provides, the chemical quality per-cent of described micro-carbon steel is:
C:0.015-0.025%, Si≤0.01%, Mn:0.1-0.2%, P≤0.01%, S≤0.01%, B:0.0015-0.0030%, all the other are Fe and inevitable impurity, the cold rolling coil grain-size of described micro-carbon steel reaches 8.5 grades, steel yield strength < 180MPa, elongation after fracture A80 >=40%.
See Fig. 1, based on identical inventive concept, the present invention also provides a kind of production method with micro-carbon steel of low yield strength to comprise the following steps:
Step 1, after hot metal pretreatment, after top and bottom combined blown converter smelting, RH refining obtain the molten steel of micro-carbon steel, continuous casting obtains slab.
Step 2, after being heated by described slab, uses coiled sheet case before carrying out roughing and finish rolling to described slab, and finish rolling obtains hot-rolled sheet, and finishing temperature control is at 890 ~ 930 DEG C, and oiler temperature control is at 680 ~ 730 DEG C.
Step 3, through overpickling, cold rolling, annealing and flattening process obtain micro-carbon steel cold rolling coil.
Introduce step 1 in detail.
See Fig. 3, add ferro-boron in described RH refining process, guarantee B > 0.0015%.Adding B element in micro-carbon steel composition controls at 0.0015-0.0030%, adds B element coarsened grain principle: thick BN high temperature austenite is preferentially separated out, and suppresses the precipitation of tiny AlN to control grain coarsening; B atom, in austenite grain boundary segregation, suppresses ferrite forming core to control grain coarsening; The preferential combination of B element and N element effectively can reduce the free N element content in steel.In the steel adding B element, coiling temperature does not affect strain aging; On the contrary, do not add in the steel of B at chemistry similar composition, to the solid solution N element content after reducing over ageing treatment during room temperature to improve ageing resistance performance, coiling temperature needs 720 DEG C or higher.
Introduce step 2 in detail.
Use coiled sheet case to comprise before described finish rolling: to adopt sparse cooling mode to be cooled to coiling temperature described hot-rolled sheet, the cold process of layer is opened U-shaped and is batched pattern simultaneously, and band steel toe tail 30 meters of exceed target coiling temperature 30 DEG C; Withdrawal roll pressure < 15KN in coiling process, adopts band steel toe tail clamping middle part to lift pattern.
Introduce step 3 in detail.
The soaking temperature of described band steel setting annealing furnace is controlled at 800 ~ 830 DEG C; Smooth elongation control is at 0.5-1.5%.The microscopic metallographic structure of described micro-carbon steel cold rolling coil is ferrite+carbide, the grain-size obtained reaches 8.5 grades, this band steel yield strength < 180MPa, elongation after fracture A80 >=40%, the poor mechanical property of band steel head, middle and end is no more than 10MPa.
Introduce the embodiment of the present invention in order to clearer, introduced from the using method of the embodiment of the present invention below.
As shown in table 1, the statistical study through early stage finds to be the soft steel of 0.04% for C content, adopts coiling temperature to be 750 DEG C/730 DEG C, annealing temperature at about 780-800 DEG C, average yield strength 172-182MPa, the requirement of basic cold rolled automobile steel; If take 680 DEG C to batch, according to above-mentioned statistics, even if 840 DEG C of annealing, yield strength is still at 194MPa.So propose oiler temperature control at 680 ~ 730 DEG C on the basis reducing C content, adopt more than 800 DEG C annealing temperatures.
Table 1 coiling temperature affects carbon aluminium-killed steel Steel Properties
The invention process utilizes micro-carbon design C to control 0.015 ~ 0.025%, the B element 0.0015 ~ 0.0030% of adding trace promotes that ferrite crystal grain alligatoring reduces yield strength, the layer cold employing U-shaped mode of batching control end to end performance and middle part body difference at 10Mpa, hot rolling adopts coiled sheet case and controls final rolling temperature means and ensures that edge mixed crystal is avoided in the rolling of finish rolling single phase region, design connects the soaking temperature of moving back and at 800 ~ 830 DEG C, the abundant recrystallize of its cold-reduced sheet is grown up, and reduces finished product yield strength.
Scheme 1:
Utilize converter, RH refining, it is C:0.018%, Si:0.007%, Mn:0.12%, P:0.007%, S:0.008%, B:0.0025% that slab cast obtains micro-carbon steel composition, and all the other are Fe and inevitable impurity.1200 DEG C of tapping temperatures are adopted in hot rolling, through coiled sheet case, finishing temperature control is at 900 DEG C, the sparse cooling mode of the cold employing of layer, open U-shaped to batch pattern oiler temperature control is at 720 DEG C end to end, body oiler temperature control is at 690 DEG C, and Withdrawal roll pressure controls at 10KN end to end simultaneously, the empty mistake in middle part, ensures to batch successfully.Through overpickling, cold-rolled process, cold rolling draft controls 85%, and continuous annealing soaking temperature controls, at 800 DEG C, to carry out the smooth of 0.5% unit elongation, obtains finished product volume.Measure yield strength at 165Mpa, unit elongation A80 is 42%, and grain fineness number 8.5 grades, punching performance is excellent.
Scheme 2:
Utilize converter, RH refining, it is C:0.020%, Si:0.008%, Mn:0.11%, P:0.011%, S:0.010%, B:0.003% that slab cast obtains micro-carbon steel composition, and all the other are Fe and inevitable impurity.1190 DEG C of tapping temperatures are adopted in hot rolling, through coiled sheet case, finishing temperature control is at 890 DEG C, the sparse cooling mode of the cold employing of layer, open U-shaped to batch pattern oiler temperature control is at 710 DEG C end to end, body oiler temperature control is at 680 DEG C, and Withdrawal roll pressure controls at 11KN end to end simultaneously, the empty mistake in middle part, ensures to batch successfully.Through overpickling, cold-rolled process, cold rolling draft controls 75%, and continuous annealing soaking temperature controls, at 800 DEG C, to carry out the smooth of 0.5% unit elongation, obtains finished product volume.Measure yield strength at 170Mpa, unit elongation A80 is 40%, and grain fineness number 8.5 grades, punching performance is excellent.
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 (6)
1. have a micro-carbon steel for low yield strength, it is characterized in that, the chemical quality per-cent of described micro-carbon steel is:
C:0.015-0.025%, Si≤0.01%, Mn:0.1-0.2%, P≤0.01%, S≤0.01%, B:0.0015-0.0030%, all the other are Fe and inevitable impurity;
The cold rolling coil grain-size of described micro-carbon steel reaches 8.5 grades, steel yield strength < 180MPa, elongation after fracture A80 >=40%.
2., based on a production method with micro-carbon steel of low yield strength according to claim 1, it is characterized in that, comprising:
After hot metal pretreatment, after top and bottom combined blown converter smelting, RH refining obtain the molten steel of micro-carbon steel, continuous casting obtains slab;
After being heated by described slab, use coiled sheet case before carrying out roughing and finish rolling to described slab, finish rolling obtains hot-rolled sheet, and finishing temperature control is at 890 ~ 930 DEG C, and oiler temperature control is at 680 ~ 730 DEG C;
Through overpickling, cold rolling, annealing and flattening process obtain micro-carbon steel cold rolling coil.
3. there is the production method of the micro-carbon steel of low yield strength as claimed in claim 2, it is characterized in that:
Add ferro-boron in described RH refining process, guarantee B > 0.0015%.
4. there is the production method of the micro-carbon steel of low yield strength as claimed in claim 2, it is characterized in that, before described finish rolling, use coiled sheet case to comprise:
Adopt sparse cooling mode to be cooled to coiling temperature described hot-rolled sheet, the cold process of layer is opened U-shaped and is batched pattern simultaneously, and band steel toe tail 30 meters of exceed target coiling temperature 30 DEG C;
Withdrawal roll pressure < 15KN in coiling process, adopts band steel toe tail clamping middle part to lift pattern.
5. there is the production method of the micro-carbon steel of low yield strength as claimed in claim 2, it is characterized in that:
The soaking temperature of described band steel setting annealing furnace is controlled at 800 ~ 830 DEG C; Smooth elongation control is at 0.5-1.5%.
6. there is the production method of the micro-carbon steel of low yield strength as claimed in claim 2, it is characterized in that:
The microscopic metallographic structure of described micro-carbon steel cold rolling coil is ferrite+carbide.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107779743A (en) * | 2016-08-30 | 2018-03-09 | 上海梅山钢铁股份有限公司 | Micro- carbon hot rolling acid-cleaning steel plate and its manufacture method with good deep drawability |
| CN112226672A (en) * | 2020-09-07 | 2021-01-15 | 日照钢铁控股集团有限公司 | Method for producing anti-aging low-carbon steel by adopting ferrite rolling process |
| CN114686665A (en) * | 2022-03-16 | 2022-07-01 | 安阳钢铁集团有限责任公司 | Anti-aging mild steel deep-drawing strip steel and production method thereof |
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| CN112226672A (en) * | 2020-09-07 | 2021-01-15 | 日照钢铁控股集团有限公司 | Method for producing anti-aging low-carbon steel by adopting ferrite rolling process |
| CN114686665A (en) * | 2022-03-16 | 2022-07-01 | 安阳钢铁集团有限责任公司 | Anti-aging mild steel deep-drawing strip steel and production method thereof |
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