CN110218937A - Carbon high-strength steel band S50C and its production method in a kind of cold rolling - Google Patents
Carbon high-strength steel band S50C and its production method in a kind of cold rolling Download PDFInfo
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- CN110218937A CN110218937A CN201910483021.6A CN201910483021A CN110218937A CN 110218937 A CN110218937 A CN 110218937A CN 201910483021 A CN201910483021 A CN 201910483021A CN 110218937 A CN110218937 A CN 110218937A
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- steel band
- cold rolling
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- strength steel
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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
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials 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 discloses carbon high-strength steel band S50C and its production methods in a kind of cold rolling, and the chemical component of the steel band is [C]: 0.50~0.55Wt% by weight percentage；[Si]: 0.25~0.35Wt%；[Mn]: 0.55~0.80Wt%；[P] :≤0.030Wt%；[S] :≤0.030Wt%；[Als]: >=0.015Wt%；Remaining is the inevitable microelements such as Fe and Ca, Cr.The steel band is prepared using pickling cold continuous rolling and bell-type furnace technology, and production method successively includes hot rolled strip S50C Flash Butt Welding process, pickling cold continuous rolling process, cover annealing process, smooth process and test package storage process.The present invention is optimized by cold rolling reduction ratio reasonable distribution and batch annealing as raw material using carbon high-strength steel band S50C in hot rolling, realizes the production of cold-rolled strip, obtain tensile strength >=650MPa, carbon high-strength steel band S50C in the cold rolling of elongation after fracture >=16%.Carbon high-strength steel band S50C good mechanical performance, intensity are high in the cold rolling, have good processing performance, can satisfy the use in the fields such as automobile manufacture, engineering machinery.
Description
Technical field
The present invention relates to iron and steel smelting technology field, it is related to carbon high-strength steel band S50C and its production method in a kind of cold rolling,
In particular to a kind of using flash welder welding procedure, pickling tandem mills rolling mill practice and batch annealing production
Production method of the carbon high-strength steel with S50C and the steel band in 650Pa grades of cold rollings.
Background technique
The high-strength steel band of middle carbon high-strength steel band, that is, carbon content >=0.5% is that the alloys such as addition manganese, chromium, molybdenum are strong in medium carbon steel
Change the high-strength steel band that element is prepared, product is widely used to automobile manufacture, engineering machinery, special equipment, high-end saw
The fields such as piece and motorcycle engine accessory special implement.Middle carbon high-strength steel be mainly used for S50C camera structure member,
Spring, clutch components, motorcycle engine accessory, safety buckle and washer etc., which is generally hot rolled strip.But heat
Strip rolling haves the defects that mechanical performance is not good enough.
Summary of the invention
The purpose of the invention is to overcome defect of the carbon high-strength steel with bad mechanical property existing for S50C in hot rolling, provide
Carbon high-strength steel band S50C in a kind of cold rolling.
It is a further object of the present invention to provide production method of the carbon high-strength steel with S50C in above-mentioned cold rolling.
Carbon high-strength steel band S50C in a kind of cold rolling provided by the invention, chemical component is [C] by weight percentage:
0.50~0.55Wt%；[Si]: 0.25~0.35Wt%；[Mn]: 0.55~0.80Wt%；[P] :≤0.030Wt%；[S] :≤
0.030Wt%；[Als]: >=0.015Wt%；Remaining is the inevitable microelements such as Fe and Ca, Cr.
Tensile strength >=650MPa of the carbon high-strength steel with S50C, elongation after fracture >=16% in above-mentioned cold rolling.
Production method of the carbon high-strength steel with S50C in a kind of cold rolling provided by the invention successively includes that hot rolled strip S50C dodges
Photocoagulation process, pickling cold continuous rolling process, cover annealing process, smooth process and test package are put in storage process；
Wherein, in pickling cold continuous rolling process: the control of pickling concentration is 18% ± 0.5%, 80~85 DEG C of pickling temperature, pickling speed 30
~35m/min；Cold rolling total reduction 45.0~55.0%, the first rack reduction ratio 14.4~17.6%, the second rack reduction ratio
13.2~16.0%, third rack reduction ratio 8.0~9.8%, the 4th rack reduction ratio 7.9~9.6%, the 5th rack reduction ratio 1.5
~2.0%；
In cover annealing process: cold hot(test)-spot temperature of annealing is 620(-5~+5) DEG C/690(-5~+0) DEG C, soaking time >=
5h, cooling section are 690~550 DEG C；Cooling rate control is≤25 DEG C/h, cold using air-cooled full speed when temperature is less than 550 DEG C
But, cooling at full speed using water cooling when temperature is less than 380 DEG C, tapping temperature≤90 DEG C；
As the further preferred of technical solution of the present invention, in above-mentioned Flash Butt Welding process: 11~13s of flash time, upset are long
4~5.5mm is spent, 4 grades of voltage class, bond pattern is oil dripping+annealing.
In smooth process: elongation percentage is set as 1.59~1.62%, 14.8~15.3mS/cm of leveling precision conductivity.
The beneficial effects of the present invention are:
1, the present invention passes through cold rolling reduction ratio reasonable distribution and cover annealing work as raw material using carbon high-strength steel band S50C in hot rolling
Skill optimization, realizes the production of cold-rolled strip, obtains tensile strength >=650MPa, and carbon is high in the cold rolling of elongation after fracture >=16%
Strong steel band S50C.Carbon high-strength steel band S50C good mechanical performance, intensity are high in the cold rolling, have good processing performance, can be with
Meet the use in the fields such as automobile manufacture, engineering machinery.
2, the present invention carries out cold rolling using tandem mills, and welds and use Flash Butt Welding process, compared to resistance
The cold rolling production method of welding and routine, with technological advantage with short production cycle, production cost is low.
3, the present invention carries out the heat treatment after cold rolling using bell type annealing furnace, and annealing heating rate is uniform, and soaking time is long,
The fluctuation of product mechanical performance is small, microscopic structure is uniform and processing performance is good.
Specific embodiment
Carbon high-strength steel band S50C and its production method in cold rolling of the invention are carried out below by specific embodiment detailed
Explanation.
Carbon high-strength steel band S50C is carbon high-strength steel band in 650Pa grades of cold rollings in cold rolling in each embodiment.Its production technology is such as
Preceding described, details are not described herein again, only provides the design parameter of production technology below.
Embodiment 1
Cold-rolled strip ingredient:
[C]: 0.50Wt%；[Si]: 0.25Wt%；[Mn]: 0.72Wt%；[P]: 0.030Wt%；[S]: 0.0155Wt%；[Als]:
0.026Wt%；Remaining is the inevitable microelements such as Fe and Ca, Cr.
Flash Butt Welding process:
Flash time 11s, upset length 4mm, 4 grades of voltage class, bond pattern is oil dripping+annealing.
Pickling cold continuous rolling process:
The control of pickling concentration is 18.2%, and pickling temperature is 80 DEG C, pickling speed 30m/min；Cold rolling total reduction is 51.4%,
First rack reduction ratio 16.5%, the second rack reduction ratio 15.1%, third rack reduction ratio 9.1%, the 4th rack reduction ratio
9.0%, the 5th rack reduction ratio 1.7%.
Annealing and smooth process:
The practical cold hot(test)-spot temperature of annealing is 615 DEG C/685 DEG C, soaking time 5.2h, practical in 690~550 DEG C of cooling sections
21 DEG C/h of cooling rate when temperature reaches 549 DEG C, starts air-cooled full speed cooling, and temperature reaches 379 DEG C, is converted to water cooling at full speed
Cooling, tapping temperature is 88 DEG C；Practical elongation percentage is 1.59%, and leveling precision conductivity is 14.8mS/cm, final products specification
1.70*1250mm.Carbon high-strength steel band S50C and carbon high-strength steel band in cold rolling manufactured in the present embodiment in the existing hot rolling of same specification
The mechanical performance of S50C is compared as follows shown in table 1.
Carbon high-strength steel compares with the mechanical performance of S50C in hot, cold rolling in 1 embodiment 1 of table
Embodiment 2
Cold-rolled strip ingredient:
[C]: 0.55Wt%；[Si]: 0.28Wt%；[Mn]: 0.55Wt%；[P]: 0.021Wt%；[S]: 0.030Wt%；[Als]:
0.028Wt%；Remaining is the inevitable microelements such as Fe and Ca, Cr.
Flash Butt Welding process:
Flash time 13s, upset length 5.5mm, 4 grades of voltage class, bond pattern is oil dripping+annealing.
Pickling cold continuous rolling process:
The control of pickling concentration is 17.5%, and pickling temperature is 82 DEG C, pickling speed 31m/min；Cold rolling total reduction is 55.0%,
First rack reduction ratio 17.6%, the second rack reduction ratio 16.0%, third rack reduction ratio 9.8%, the 4th rack reduction ratio
9.6%, the 5th rack reduction ratio 2.0%.
Annealing and smooth process:
The practical cold hot(test)-spot temperature of annealing is 621 DEG C/689 DEG C, soaking time 5.4h, practical in 690~550 DEG C of cooling sections
22 DEG C/h of cooling rate when temperature reaches 549 DEG C, starts air-cooled full speed cooling, and temperature reaches 379 DEG C, is converted to water cooling at full speed
Cooling, tapping temperature is 85 DEG C；Practical elongation percentage is 1.61%, and leveling precision conductivity is 15.1mS/cm, final products specification
1.35*1250mm.Carbon high-strength steel band S50C and carbon high-strength steel band in cold rolling manufactured in the present embodiment in the existing hot rolling of same specification
The mechanical performance of S50C is compared as follows shown in table 2.
Carbon high-strength steel compares with the mechanical performance of S50C in hot, cold rolling in 2 embodiment 2 of table
Embodiment 3
Cold-rolled strip ingredient:
[C]: 0.52Wt%；[Si]: 0.35Wt%；[Mn]: 0.80Wt%；[P]: 0.011Wt%；[S]: 0.010Wt%；[Als]:
0.015Wt%；Remaining is the inevitable microelements such as Fe and Ca, Cr.
Flash Butt Welding process:
Flash time 13s, upset length 4.5mm, 4 grades of voltage class, bond pattern is oil dripping+annealing.
Pickling cold continuous rolling process:
The control of pickling concentration is 18.5%, and pickling temperature is 85 DEG C, pickling speed 35m/min；Cold rolling total reduction is 45.0%,
First rack reduction ratio 14.4%, the second rack reduction ratio 13.2%, third rack reduction ratio 8.0%, the 4th rack reduction ratio
7.9%, the 5th rack reduction ratio 1.5%.
Annealing and smooth process:
The practical cold hot(test)-spot temperature of annealing is 625 DEG C/690 DEG C, soaking time 5.0h, practical in 690~550 DEG C of cooling sections
25 DEG C/h of cooling rate when temperature reaches 549 DEG C, starts air-cooled full speed cooling, and temperature reaches 379 DEG C, is converted to water cooling at full speed
Cooling, tapping temperature is 90 DEG C；Practical elongation percentage is 1.62%, and leveling precision conductivity is 15.3mS/cm, final products specification
2.20*1250mm.Carbon high-strength steel band S50C and carbon high-strength steel band in cold rolling manufactured in the present embodiment in the existing hot rolling of same specification
The mechanical performance of S50C is compared as follows shown in table 3.
Carbon high-strength steel compares with the mechanical performance of S50C in hot, cold rolling in 3 embodiment 3 of table
Data can be seen that cold-rolled strip elongation after fracture with higher, and its yield strength and tensile strength from table 1-3
Obviously higher than hot rolled strip, the tensile strength of cold-rolled strip >=650MPa, can satisfy the neck such as automobile manufacture, engineering machinery
The use in domain.
Claims (6)
1. carbon high-strength steel band S50C in a kind of cold rolling, which is characterized in that the chemical component of the steel band is by weight percentage,
[C]: 0.50~0.55Wt%；[Si]: 0.25~0.35Wt%；[Mn]: 0.55~0.80Wt%；[P] :≤0.030Wt%；[S] :≤
0.030Wt%；[Als]: >=0.015Wt%；Remaining is the inevitable microelements such as Fe and Ca, Cr.
2. carbon high-strength steel band S50C in a kind of cold rolling according to claim 1, which is characterized in that carbon is high-strength in the cold rolling
Tensile strength >=650MPa of steel band S50C, elongation after fracture >=16%.
3. production method of the carbon high-strength steel with S50C in a kind of cold rolling according to claim 1 or 2, which is characterized in that institute
It states steel band to be prepared using pickling cold continuous rolling and bell-type furnace technology, production method successively includes hot rolled strip S50C flash welding
Connect process, pickling cold continuous rolling process, cover annealing process, smooth process and test package storage process；
In the pickling cold continuous rolling process: the control of pickling concentration is 18% ± 0.5%, 80~85 DEG C of pickling temperature, pickling speed 30
~35m/min；Cold rolling total reduction 45.0~55.0%, the first rack reduction ratio 14.4~17.6%, the second rack reduction ratio
13.2~16.0%, third rack reduction ratio 8.0~9.8%, the 4th rack reduction ratio 7.9~9.6%, the 5th rack reduction ratio 1.5
~2.0%；
In the cover annealing process: cold hot(test)-spot temperature of annealing is 620(-5~+5) DEG C/690(-5~+0) DEG C, soaking time
>=5h, cooling section are 690~550 DEG C；Cooling rate control is≤25 DEG C/h, when temperature is less than 550 DEG C, using air-cooled full speed
It is cooling, cooling at full speed using water cooling when temperature is less than 380 DEG C, tapping temperature≤90 DEG C.
4. production method of the carbon high-strength steel with S50C in a kind of cold rolling according to claim 3, which is characterized in that the sudden strain of a muscle
In photocoagulation process: 11~13s of flash time, upset 4~5.5mm of length, 4 grades of voltage class, bond pattern is oil dripping+move back
Fire.
5. production method of the carbon high-strength steel with S50C in a kind of cold rolling according to claim 3, which is characterized in that described flat
In whole process: elongation percentage is set as 1.59~1.62%, 14.8~15.3mS/cm of leveling precision conductivity.
6. production method of the carbon high-strength steel with S50C in a kind of cold rolling according to claim 4, which is characterized in that described flat
In whole process: elongation percentage is set as 1.59~1.62%, 14.8~15.3mS/cm of leveling precision conductivity.
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| CN201910483021.6A CN110218937A (en) | 2019-06-04 | 2019-06-04 | Carbon high-strength steel band S50C and its production method in a kind of cold rolling |
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| CN201910483021.6A CN110218937A (en) | 2019-06-04 | 2019-06-04 | Carbon high-strength steel band S50C and its production method in a kind of cold rolling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112474822A (en) * | 2020-12-10 | 2021-03-12 | 安阳钢铁股份有限公司 | Cold continuous rolling production process for medium carbon steel |
Citations (3)
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|---|---|---|---|---|
| CN104722904A (en) * | 2015-03-12 | 2015-06-24 | 唐山钢铁集团有限责任公司 | Welding process for producing cold-rolled dual-phase steel strips of 780 MPa and below |
| CN106256918A (en) * | 2015-06-17 | 2016-12-28 | 上海梅山钢铁股份有限公司 | The Automobile flywheel cold-strip steel of a kind of precision stamping processing and manufacture method thereof |
| CN107649512A (en) * | 2017-09-08 | 2018-02-02 | 新余钢铁股份有限公司 | A kind of manufacturing process of 65Mn cold rollings wide strip |
-
2019
- 2019-06-04 CN CN201910483021.6A patent/CN110218937A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104722904A (en) * | 2015-03-12 | 2015-06-24 | 唐山钢铁集团有限责任公司 | Welding process for producing cold-rolled dual-phase steel strips of 780 MPa and below |
| CN106256918A (en) * | 2015-06-17 | 2016-12-28 | 上海梅山钢铁股份有限公司 | The Automobile flywheel cold-strip steel of a kind of precision stamping processing and manufacture method thereof |
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| 陈宏祖等: "《电炉炼钢问答》", 31 March 2012, 冶金工业出版社 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112474822A (en) * | 2020-12-10 | 2021-03-12 | 安阳钢铁股份有限公司 | Cold continuous rolling production process for medium carbon steel |
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Application publication date: 20190910 |