CN106282795A - A kind of high-strength IF steel band and hot rolling production method thereof - Google Patents
A kind of high-strength IF steel band and hot rolling production method thereof Download PDFInfo
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- CN106282795A CN106282795A CN201610758942.5A CN201610758942A CN106282795A CN 106282795 A CN106282795 A CN 106282795A CN 201610758942 A CN201610758942 A CN 201610758942A CN 106282795 A CN106282795 A CN 106282795A
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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
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- Chemical & Material Sciences (AREA)
- 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)
- Metal Rolling (AREA)
Abstract
The present invention relates to the hot-rolling method of a kind of high-strength IF steel band, its chemical composition and percentage by weight C :≤0.0050%；Si:0.10～0.30%；Mn:0.35～0.70%；P:0.045～0.085%；S :≤0.008%；Als:0.025～0.055%；Ti:0.050～0.070%；B:0.0005 0.0015%；N :≤0.0050%, remaining is ferrum and inevitable trace element.The present invention is to provide a kind of for manganese, phosphorus, the hot-rolling method of high-strength IF steel band that Ti content is the highest, by controlling the leading portion cooling rate in the slab slab speed of service, Coil Box threading and rolling speed, laminar cooling process when time of staying of heating furnace, the furnace temperature of each section of heating furnace, de-scaling and coiling temperature, the high-strength IF steel band strength obtained is suitable, microscopic structure is uniform, surface quality is good, product yield strength is 310～350MPa, tensile strength >=400MPa, elongation percentage A50 >=38%.
Description
Technical field
The invention belongs to technical field of metallurgical sheet production, be specifically related to a kind of high-strength IF steel band and hot rolling thereof
Production method.
Background technology
High-strength IF steel band, owing to having the deep drawability of excellence and suitable intensity simultaneously, obtains in automobile industry
To extensively application.Current high-strength IF steel band is typically employed in ultra-low-carbon steel strong carbonitride such as addition niobium, titanium etc.
Form element, use manganese, phosphorus to carry out solution strengthening simultaneously, particularly with adding merely titanium, component system without niobium, due to
Manganese, phosphorus, Ti content are the highest, produce center segregation the most after hot rolling, control to cause not to the processability of cold rolling rear product
Profit impact, therefore needs to seek a kind of suitable hot rolling technology, makes product have suitable intensity and the most micro-after hot rolling concurrently
Tissue, avoids belt steel surface to produce iron scale press-in phenomenon simultaneously.
Summary of the invention
It is an object of the present invention to provide a kind of high-strength IF steel band the highest for manganese, phosphorus, Ti content and heat thereof
Rolling production method, makes product be provided simultaneously with suitable intensity, uniform microscopic structure and good surface quality after hot rolling, for
Cold rolling ready.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that a kind of high-strength IF steel band, described
Steel band chemical composition and weight/mass percentage composition thereof are as follows: C≤0.0050%；Si:0.10～0.30%；Mn:0.35～0.70%；P:
0.045～0.085%；S≤0.008%；Als:0.025～0.055%；Ti:0.050～0.070%；B:0.0005-0.0015%；N
≤ 0.0050%, remaining is ferrum and inevitable trace element.
Steel band yield strength of the present invention is 310～350MPa, tensile strength >=400MPa, elongation percentage A50≥38%。
Another object of the present invention is to provide the hot rolling production method of a kind of above-mentioned high-strength IF steel band, described
Production method includes following operation: heating furnace heating, furnace rear de-scaling, roughing de-scaling, single chassis roughing, Coil Box, finish rolling de-scaling,
7 frame finish rolling, section cooling, batch.
Heating furnace heating process of the present invention, is divided into a bringing-up section, two bringing-up sections, three bringing-up sections and soaking zone, slab
Time inside furnace 120-150min, three bringing-up section temperature 1280-1310 DEG C, soaking zone temperature 1240-1270 DEG C, tapping temperature 1130
～1150 DEG C.
Furnace rear de-scaling operation of the present invention, slab speed of service 0.70-0.80m/s.
Single chassis roughing operation of the present invention, for reciprocating rolling, after the passes of end, workpiece thickness is 40-
45mm。
Coil Box operation of the present invention, threading speed 2-2.5m/min, rolling speed 2.5-3m/min.
7 frame finishing rolling step of the present invention, need to reduce temperature drop, it is ensured that mill speed, and finishing temperature control is at 900-
930℃。
Section cooling operation of the present invention, leading portion rate of cooling controls at 80～100 DEG C/s.
Coiling process of the present invention, oiler temperature control is at 580-620 DEG C.
Use what technique scheme produced to have the beneficial effects that: the present invention is to provide a kind of equal for manganese, phosphorus, Ti content
The hot-rolling method of higher high-strength IF steel band, by controlling slab at time of staying of heating furnace, each section of heating furnace
Furnace temperature, de-scaling time the slab speed of service, Coil Box threading and rolling speed, laminar cooling process in leading portion cooling rate and
Coiling temperature, the high-strength IF steel band strength obtained is suitable, microscopic structure is uniform, surface quality is good, and product is bent
Taking intensity is 310～350MPa, tensile strength >=400MPa, elongation percentage A50 >=38%.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further detailed explanation.
The various embodiments of the present invention following hot rolling technology flow process of employing: heating furnace heating → furnace rear de-scaling → roughing de-scaling → mono-
Frame roughing → finish rolling de-scaling → 7 frame finish rolling → section cooling → batch；
Heating furnace is divided into a bringing-up section, two bringing-up sections, three bringing-up sections and soaking zone, slab time inside furnace 120-150min, Acanthopanan trifoliatus (L.) Merr.
Hot arc temperature 1280-1310 DEG C, soaking zone temperature 1240-1270 DEG C, tapping temperature 1130～1150 DEG C；Furnace rear de-scaling water pressure
>=25MPa, slab speed of service 0.70-0.80m/s；Roughing de-scaling water pressure >=25MPa, will need to open in each passage of roughing
Open；Workpiece thickness 40-45mm after the passes of single chassis roughing end；Coil Box is used to ensure intermediate blank head and tail temperature, threading
Speed 2-2.5m/min, rolling speed 2.5-3m/min；Using 7 frame finish rolling, finishing temperature control is at 900-930 DEG C；Laminar flow
Cooling uses leading portion cooling, the mode of afterbody fine setting, and leading portion rate of cooling controls at 80～100 DEG C/s, and open side spirt row
The edge purging of layer-cold roller way；Oiler temperature control, at 580-620 DEG C, obtains high-strength IF steel band.Embodiment 1-6 master
Technological parameter is wanted to be shown in Table 2.
Embodiment 1
A kind of high-strength IF steel band, 5.0mm, chemical composition is shown in Table 1, and steel band mechanical property is shown in Table 3.
Production method includes following operation: heating furnace heating → furnace rear de-scaling → roughing de-scaling → single chassis roughing → finish rolling
De-scaling → 7 frame finish rolling → section cooling → batch；
Heating furnace is divided into a bringing-up section, two bringing-up sections, three bringing-up sections and soaking zone, slab time inside furnace 128min, three bringing-up sections
Temperature 1294 DEG C, soaking zone temperature 1252 DEG C, tapping temperature 1132 DEG C；Furnace rear de-scaling water pressure >=25MPa, the slab speed of service
0.75m/s；Roughing de-scaling water pressure >=25MPa, will need to open in each passage of roughing；After the passes of single chassis roughing end
Workpiece thickness 45mm；Coil Box is used to ensure intermediate blank head and tail temperature, threading speed 2.5m/min, rolling speed 3m/min；
Using 7 frame finish rolling, finishing temperature control is at 930 DEG C；Section cooling uses leading portion cooling, the mode of afterbody fine setting, and leading portion is cold
But speed controlling is at 80 DEG C/s, and the edge purging of open side spirt row layer-cold roller way；Oiler temperature control is at 589 DEG C.
Embodiment 2
A kind of high-strength IF steel band, 5.0mm, chemical composition is shown in Table 1, and steel band mechanical property is shown in Table 3.
Production method includes following operation: heating furnace heating → furnace rear de-scaling → roughing de-scaling → single chassis roughing → finish rolling
De-scaling → 7 frame finish rolling → section cooling → batch；
Heating furnace is divided into a bringing-up section, two bringing-up sections, three bringing-up sections and soaking zone, slab time inside furnace 120min, three bringing-up sections
Temperature 1301 DEG C, soaking zone temperature 1270 DEG C, tapping temperature 1130 DEG C；Furnace rear de-scaling water pressure >=25MPa, the slab speed of service
0.70m/s；Roughing de-scaling water pressure >=25MPa, will need to open in each passage of roughing；After the passes of single chassis roughing end
Workpiece thickness 43mm；Coil Box is used to ensure intermediate blank head and tail temperature, threading speed 2.4m/min, rolling speed 2.8m/
min；Using 7 frame finish rolling, finishing temperature control is at 925 DEG C；Section cooling uses leading portion cooling, the mode of afterbody fine setting, front
Section rate of cooling controls at 84 DEG C/s, and the edge purging of open side spirt row layer-cold roller way；Oiler temperature control is at 580 DEG C.
Embodiment 3
A kind of high-strength IF steel band, 4.5mm, chemical composition is shown in Table 1, and steel band mechanical property is shown in Table 3.
Production method includes following operation: heating furnace heating → furnace rear de-scaling → roughing de-scaling → single chassis roughing → finish rolling
De-scaling → 7 frame finish rolling → section cooling → batch；
Heating furnace is divided into a bringing-up section, two bringing-up sections, three bringing-up sections and soaking zone, slab time inside furnace 132min, three bringing-up sections
Temperature 1280 DEG C, soaking zone temperature 1254 DEG C, tapping temperature 1133 DEG C；Furnace rear de-scaling water pressure >=25MPa, the slab speed of service
0.78m/s；Roughing de-scaling water pressure >=25MPa, will need to open in each passage of roughing；After the passes of single chassis roughing end
Workpiece thickness 43mm；Coil Box is used to ensure intermediate blank head and tail temperature, threading speed 2.2m/min, rolling speed 2.7m/
min；Using 7 frame finish rolling, finishing temperature control is at 922 DEG C；Section cooling uses leading portion cooling, the mode of afterbody fine setting, front
Section rate of cooling controls at 88 DEG C/s, and the edge purging of open side spirt row layer-cold roller way；Oiler temperature control is at 604 DEG C.
Embodiment 4
A kind of high-strength IF steel band, 4.0mm, chemical composition is shown in Table 1, and steel band mechanical property is shown in Table 3.
Production method includes following operation: heating furnace heating → furnace rear de-scaling → roughing de-scaling → single chassis roughing → finish rolling
De-scaling → 7 frame finish rolling → section cooling → batch；
Heating furnace is divided into a bringing-up section, two bringing-up sections, three bringing-up sections and soaking zone, slab time inside furnace 145min, three bringing-up sections
Temperature 1283 DEG C, soaking zone temperature 1262 DEG C, tapping temperature 1143 DEG C；Furnace rear de-scaling water pressure >=25MPa, the slab speed of service
0.72m/s；Roughing de-scaling water pressure >=25MPa, will need to open in each passage of roughing；After the passes of single chassis roughing end
Workpiece thickness 42mm；Coil Box is used to ensure intermediate blank head and tail temperature, threading speed 2.1m/min, rolling speed 2.6m/
min；Using 7 frame finish rolling, finishing temperature control is at 920 DEG C；Section cooling uses leading portion cooling, the mode of afterbody fine setting, front
Section rate of cooling controls at 90 DEG C/s, and the edge purging of open side spirt row layer-cold roller way；Oiler temperature control is at 608 DEG C.
Embodiment 5
A kind of high-strength IF steel band, 3.5mm, chemical composition is shown in Table 1, and steel band mechanical property is shown in Table 3.
Production method includes following operation: heating furnace heating → furnace rear de-scaling → roughing de-scaling → single chassis roughing → finish rolling
De-scaling → 7 frame finish rolling → section cooling → batch；
Heating furnace is divided into a bringing-up section, two bringing-up sections, three bringing-up sections and soaking zone, slab time inside furnace 150min, three bringing-up sections
Temperature 1292 DEG C, soaking zone temperature 1240 DEG C, tapping temperature 1150 DEG C；Furnace rear de-scaling water pressure >=25MPa, the slab speed of service
0.80m/s；Roughing de-scaling water pressure >=25MPa, will need to open in each passage of roughing；After the passes of single chassis roughing end
Workpiece thickness 40mm；Coil Box is used to ensure intermediate blank head and tail temperature, threading speed 2m/min, rolling speed 2.5m/min；
Using 7 frame finish rolling, finishing temperature control is at 917 DEG C；Section cooling uses leading portion cooling, the mode of afterbody fine setting, and leading portion is cold
But speed controlling is at 93 DEG C/s, and the edge purging of open side spirt row layer-cold roller way；Oiler temperature control is at 613 DEG C.
Embodiment 6
A kind of high-strength IF steel band, 3.0mm, chemical composition is shown in Table 1, and steel band mechanical property is shown in Table 3.
Production method includes following operation: heating furnace heating → furnace rear de-scaling → roughing de-scaling → single chassis roughing → finish rolling
De-scaling → 7 frame finish rolling → section cooling → batch；
Heating furnace is divided into a bringing-up section, two bringing-up sections, three bringing-up sections and soaking zone, slab time inside furnace 137min, three bringing-up sections
Temperature 1310 DEG C, soaking zone temperature 1260 DEG C, tapping temperature 1144 DEG C；Furnace rear de-scaling water pressure >=25MPa, the slab speed of service
0.77m/s；Roughing de-scaling water pressure >=25MPa, will need to open in each passage of roughing；After the passes of single chassis roughing end
Workpiece thickness 40mm；Coil Box is used to ensure intermediate blank head and tail temperature, threading speed 2m/min, rolling speed 2.5m/min；
Using 7 frame finish rolling, finishing temperature control is at 900 DEG C；Section cooling uses leading portion cooling, the mode of afterbody fine setting, and leading portion is cold
But speed controlling is at 100 DEG C/s, and the edge purging of open side spirt row layer-cold roller way；Oiler temperature control is at 620 DEG C.
Table 1 each embodiment chemical composition value (%)
Table 2 each embodiment main technologic parameters
Table 3 each embodiment steel band mechanical property
Above example is only in order to illustrative not limiting technical scheme, although entering the present invention with reference to above-described embodiment
Go detailed description, it will be understood by those within the art that: still the present invention can be modified or be equal to and replace
Changing, any modification or partial replacement without departing from the spirit and scope of the present invention, its right that all should contain in the present invention is wanted
Ask in the middle of scope.
Claims (10)
1. a high-strength IF steel band, it is characterised in that described steel band chemical composition and weight/mass percentage composition thereof are as follows:
C≤0.0050%；Si:0.10～0.30%；Mn:0.35～0.70%；P:0.045～0.085%；S≤0.008%；Als:0.025
～0.055%；Ti:0.050～0.070%；B:0.0005-0.0015%；N≤0.0050%, remaining is ferrum and the most micro-
Secondary element.
2. a kind of high-strength IF steel band as claimed in claim 1, it is characterised in that described steel band yield strength is
310～350MPa, tensile strength >=400MPa, elongation percentage A50≥38%。
3. hot rolling production method based on a kind of high-strength IF steel band described in claim 1 or 2, it is characterised in that
Described production method includes following operation: heating furnace heating, furnace rear de-scaling, roughing de-scaling, single chassis roughing, Coil Box, finish rolling
De-scaling, 7 frame finish rolling, section cooling, batch.
4. hot rolling production method as claimed in claim 3, it is characterised in that described heating furnace heating process, is divided into a heating
Section, two bringing-up sections, three bringing-up sections and soaking zone, slab time inside furnace 120-150min, three bringing-up section temperature 1280-1310 DEG C,
Soaking zone temperature 1240-1270 DEG C, tapping temperature 1130～1150 DEG C.
5. hot rolling production method as claimed in claim 3, it is characterised in that described furnace rear de-scaling operation, the slab speed of service
0.70-0.80m/s。
6. hot rolling production method as claimed in claim 3, it is characterised in that described single chassis roughing operation, for reciprocating
Rolling, after the passes of end, workpiece thickness is 40-45mm.
7. the hot rolling production method as described in claim 3-6 any one, it is characterised in that described Coil Box operation, wears
Tape speed 2-2.5m/min, rolling speed 2.5-3m/min.
8. the hot rolling production method as described in claim 3-6 any one, it is characterised in that 7 described frame finishing rolling step,
Need to reduce temperature drop, it is ensured that mill speed, finishing temperature control is at 900-930 DEG C.
9. the hot rolling production method as described in claim 3-6 any one, it is characterised in that described section cooling operation,
Leading portion rate of cooling controls at 80～100 DEG C/s.
10. the hot rolling production method as described in claim 3-6 any one, it is characterised in that described coiling process, batches
Temperature controls at 580-620 DEG C.
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| CN201610758942.5A CN106282795B (en) | 2016-08-30 | 2016-08-30 | A kind of high-strength IF steel band and its hot rolling production method |
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| CN106702268A (en) * | 2017-02-14 | 2017-05-24 | 唐山钢铁集团有限责任公司 | 390MPa-level high-strength IF (Interstitial-Free) steel and production method thereof |
| CN110172637A (en) * | 2019-03-29 | 2019-08-27 | 宁波钢铁有限公司 | A kind of 340MPa grades of deep-draw high-strength IF steel band and preparation method thereof |
| CN111266406A (en) * | 2020-03-02 | 2020-06-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Rolling method of ultrathin hot continuous rolling steel strip |
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| CN106702268A (en) * | 2017-02-14 | 2017-05-24 | 唐山钢铁集团有限责任公司 | 390MPa-level high-strength IF (Interstitial-Free) steel and production method thereof |
| CN110172637A (en) * | 2019-03-29 | 2019-08-27 | 宁波钢铁有限公司 | A kind of 340MPa grades of deep-draw high-strength IF steel band and preparation method thereof |
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| CN111266406A (en) * | 2020-03-02 | 2020-06-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Rolling method of ultrathin hot continuous rolling steel strip |
| CN111266406B (en) * | 2020-03-02 | 2022-01-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Rolling method of ultrathin hot continuous rolling steel strip |
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| Publication number | Publication date |
|---|---|
| CN106282795B (en) | 2018-04-10 |
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