CN110295325A - 540MPa grades of Ti microalloying high reaming steel steel bands and its production method - Google Patents
540MPa grades of Ti microalloying high reaming steel steel bands and its production method Download PDFInfo
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- CN110295325A CN110295325A CN201910661495.5A CN201910661495A CN110295325A CN 110295325 A CN110295325 A CN 110295325A CN 201910661495 A CN201910661495 A CN 201910661495A CN 110295325 A CN110295325 A CN 110295325A
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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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of 540MPa grades of Ti microalloying high reaming steel steel bands and its production methods, the steel band chemical component composition and its mass percentage are as follows: C:0.07~0.11%, Mn:1.00~1.30%, S≤0.015%, P≤0.020%, Si:0.05~0.12%, Als:0.015~0.040%, Ti:0.020~0.040%, N≤0.0050%, Ceq:0.30~0.36%, surplus are iron and inevitable impurity；The production method includes converter smelting, LF refining, continuous casting, heating, roughing, finish rolling, cooling and coiling process.The present invention is using low-carbon, conventional manganese, titanium alloy component design, and by cooling path, medium temperature coiling coater, gained steel band is suitble to produce the stamping parts of automobile such as Japanese automotive axle front rack, is conducive to mitigate car body weight, reduces fuel consumption.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of 540MPa grades of Ti microalloying high reaming steel steel bands and its
Production method.
Background technique
Currently, the development of Domestic Automotive Industry not only continues to increase the dosage of high-strength steel sheet, but also to the matter of steel plate
More stringent requirements are proposed with performance for amount.Using orthodox car axle carrier steel SAPH440 component system and hot rolling technology,
Hot rolling performance is although excellent, meets user demand, but the addition of a large amount of alloying elements will lead to the increase of cost while can not expire
The requirement of the high reaming performance of sufficient SP series.
It is needed for the difference of Japanese vehicle, Tang Gang group is dedicated on the basis for guaranteeing plate surface quality and performance
On, develop automotive axle bracket steel further to seriation, high strengthening direction.The automotive axle bracket being currently being deployed
NES-M2021-2009-N is marked with reference to day with steel SP252-540F steel band.
How the reaming performance of product guaranteed by the matching of chemical component to steel and process conditions, while reducing vapour
The cost of vehicle axle carrier steel becomes a problem urgently to be resolved.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of 540MPa grades of Ti microalloying high reaming steel steel bands and its lifes
Production method.The high reaming steel of invention Ti microalloying produces mainly for the production of stamping parts of automobile such as Japanese automotive axle front racks
Moral character is able to satisfy day mark NES-M2021-2009-N.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: it is a kind of 540MPa grades of Ti microalloying high to expand
Hole steel steel band, steel band chemical component composition and its mass percentage are as follows: C:0.07~0.11%, Mn:1.00~1.30%,
S≤0.015%, P≤0.020%, Si:0.05~0.12%, Als:0.015~0.040%, Ti:0.020~0.040%, N≤
0.0050%, Ceq:0.30~0.36%, surplus are iron and inevitable impurity.
Thickness of strips of the present invention is 1.8~3.5mm.
Steel band tensile strength R of the present inventioneH>=540MPa, yield strength Rm: 365~500MPa, elongation after fracture A50:
23~37%, hole expansibility >=80%.
The present invention also provides a kind of production method of 540MPa grades of Ti microalloying high reaming steel steel bands, the producers
Method includes converter smelting, LF refining, continuous casting, heating, roughing, finish rolling, cooling and coiling process；The cooling process, steel band are first
It is as cold as 680~720 DEG C fastly with 15~35 DEG C/s through laminar flow front coarse adjustment section, using intermediate air-cooled 3~6s, then after laminar flow
Accurate adjustment section in portion's is as cold as 460~520 DEG C of coiling temperature with 15~35 DEG C/s fastly.
Coiling process of the present invention, 460~520 DEG C of coiling temperature.
Continuous casting working procedure of the present invention, by stablizing casting speed control component segregation, slab width≤1300mm, pulling rate are
1.40~1.50m/min, slab width ﹥ 1300mm, pulling rate are 1.30~1.40m/min, and continuous casting obtains 180~230mm of thickness
Steel billet；Continuous casting steel billet chemical component composition and its mass percentage are as follows: C:0.07~0.11%, Mn:1.00~1.30%, S
≤ 0.015%, P≤0.020%, Si:0.05~0.12%, Als:0.015~0.040%, Ti:0.020~0.040%, N≤
0.0050%, Ceq:0.30~0.36%, surplus are iron and inevitable impurity.
Heating process of the present invention, through stepped heating stove heating, total time in furnace of heating furnace be 150~
200min, 1210~1310 DEG C of heating furnace soaking zone heating temperature, 35~48min of soaking time.
Roughing operation of the present invention, the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, dephosphorization water pressure
It batches through Coil Box and overturns end to end for 20~25MPa, gained centre 30~34mm of sotck thinkness.
Finishing rolling step of the present invention rolls into the steel band with a thickness of 1.8~3.5mm, entry temperature at finishing through 7 passage finish rolling
1020~1060 DEG C, 820~860 DEG C of finishing temperature.
The beneficial effects of adopting the technical scheme are that 1,540MPa grades of high reamings of Ti microalloying of the present invention
Steel steel band is using low-carbon, conventional manganese, titanium alloy component design, by cooling path clustering, adjusts steel C in phase transition process and matches
Point, improve elongation percentage；It being batched by controlling medium temperature, control F changes ratio to P, and the F+B of available better performances is organized, from
And obtain higher tensile strength and good elongation percentage and higher hole expansibility.2,540MPa grades of Ti microalloying of the present invention high
Reaming steel steel band tensile strength ReH>=540MPa, yield strength Rm: 365~500MPa, elongation after fracture A50: 23~37%, reaming
Rate >=80% has preferable cold formability energy, is suitble to the stamping parts of automobile such as the Japanese automotive axle front rack of production.3, of the invention
540MPa grades of Ti microalloying high reaming steel steel bands are conducive to mitigate car body weight, reduce fuel consumption, reduce vehicle exhaust row
It puts, realizes the green manufacturing of product.
Detailed description of the invention
Fig. 1 is the metallographic structure figure of the 540MPa grades high reaming steel SP252-540F steel band of 1 Ti microalloying of embodiment；
Fig. 2 is the metallographic structure figure of the 540MPa grades high reaming steel SP252-540F steel band of 2 Ti microalloying of embodiment；
Fig. 3 is the metallographic structure figure of the 540MPa grades high reaming steel SP252-540F steel band of 3 Ti microalloying of embodiment；
Fig. 4 is the metallographic structure figure of the 540MPa grades high reaming steel SP252-540F steel band of 4 Ti microalloying of embodiment；
Fig. 5 is the metallographic structure figure of the 540MPa grades high reaming steel SP252-540F steel band of 5 Ti microalloying of embodiment；
Fig. 6 is the metallographic structure figure of the 540MPa grades high reaming steel SP252-540F steel band of 6 Ti microalloying of embodiment；
Fig. 7 is the metallographic structure figure of the 540MPa grades high reaming steel SP252-540F steel band of 7 Ti microalloying of embodiment；
Fig. 8 is the metallographic structure figure of the 540MPa grades high reaming steel SP252-540F steel band of 8 Ti microalloying of embodiment；
Fig. 9 is the metallographic structure figure of the 540MPa grades high reaming steel SP252-540F steel band of 9 Ti microalloying of embodiment；
Figure 10 is the metallographic structure figure of the 540MPa grades high reaming steel SP252-540F steel band of 10 Ti microalloying of embodiment.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
Embodiment 1
The 540MPa grades high reaming steel SP252-540F finished steel sheet of the present embodiment Ti microalloying with a thickness of 1.8mm, chemistry at
It is grouped as and mass percentage is shown in Table 1.
The production method of the 540MPa grades high reaming steel SP252-540F steel band of the present embodiment Ti microalloying includes converter smelting
Refining, LF refining, continuous casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) continuous casting working procedure: by stablizing casting speed control component segregation, pulling rate 1.45m/min, continuous casting obtains thickness 200mm, width
The steel billet of 1280mm, continuous casting steel billet chemical component composition and its mass percentage are shown in Table 1；
(2) heating process: being 200min, heating furnace soaking zone in total time in furnace of heating furnace through stepped heating stove heating
1310 DEG C of heating temperature, soaking time 39min；
(3) roughing operation: the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, dephosphorization water pressure are 22MPa, gained
Intermediate sotck thinkness 34mm, batches through Coil Box and overturns end to end；
(4) finishing rolling step: rolling into the steel band with a thickness of 1.8mm through 7 passage finish rolling, and 1050 DEG C of entry temperature at finishing, finishing temperature
840℃；
(5) cooling process: steel band is first as cold as 690 DEG C through laminar flow front coarse adjustment section with 19 DEG C/s fastly, using intermediate air-cooled 5s, so
It is as cold as 460 DEG C of coiling temperature fastly with 26 DEG C/s by laminar flow rear portion accurate adjustment section；
(6) coiling process: 460 DEG C of coiling temperature.
The 540MPa grades high reaming steel SP252-540F steel band performance of the present embodiment Ti microalloying is shown in Table 2；Steel band metallographic group
It knits and sees Fig. 1.
Embodiment 2
The 540MPa grades high reaming steel SP252-540F finished steel sheet of the present embodiment Ti microalloying with a thickness of 2.4mm, chemistry at
It is grouped as and mass percentage is shown in Table 1.
The production method of the 540MPa grades high reaming steel SP252-540F steel band of the present embodiment Ti microalloying includes converter smelting
Refining, LF refining, continuous casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) continuous casting working procedure: by stablizing casting speed control component segregation, pulling rate 1.50m/min, continuous casting obtains thickness 200mm, width
The steel billet of 1250mm, continuous casting steel billet chemical component composition and its mass percentage are shown in Table 1；
(2) heating process: being 198min, heating furnace soaking zone in total time in furnace of heating furnace through stepped heating stove heating
1309 DEG C of heating temperature, soaking time 38min；
(3) roughing operation: the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, dephosphorization water pressure are 23MPa, gained
Intermediate sotck thinkness 32mm, batches through Coil Box and overturns end to end；
(4) finishing rolling step: rolling into the steel band with a thickness of 2.4mm through 7 passage finish rolling, and 1060 DEG C of entry temperature at finishing, finishing temperature
860℃；
(5) cooling process: steel band is first as cold as 680 DEG C through laminar flow front coarse adjustment section with 25 DEG C/s fastly, using intermediate air-cooled 3s, so
It is as cold as 520 DEG C of coiling temperature fastly with 16 DEG C/s by laminar flow rear portion accurate adjustment section；
(6) coiling process: 520 DEG C of coiling temperature.
The 540MPa grades high reaming steel SP252-540F steel band performance of the present embodiment Ti microalloying is shown in Table 2；Steel band metallographic group
It knits and sees Fig. 2.
Embodiment 3
The 540MPa grades high reaming steel SP252-540F finished steel sheet of the present embodiment Ti microalloying with a thickness of 2.2mm, chemistry at
It is grouped as and mass percentage is shown in Table 1.
The production method of the 540MPa grades high reaming steel SP252-540F steel band of the present embodiment Ti microalloying includes converter smelting
Refining, LF refining, continuous casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) continuous casting working procedure: by stablizing casting speed control component segregation, pulling rate 1.40m/min, continuous casting obtains thickness 210mm, width
The steel billet of 1300mm, continuous casting steel billet chemical component composition and its mass percentage are shown in Table 1；
(2) heating process: being 180min, heating furnace soaking zone in total time in furnace of heating furnace through stepped heating stove heating
1307 DEG C of heating temperature, soaking time 39min；
(3) roughing operation: the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, dephosphorization water pressure are 23MPa, gained
Intermediate sotck thinkness 32mm, batches through Coil Box and overturns end to end；
(4) finishing rolling step: rolling into the steel band with a thickness of 2.2mm through 7 passage finish rolling, and 1060 DEG C of entry temperature at finishing, finishing temperature
850℃；
(5) cooling process: steel band is first as cold as 720 DEG C through laminar flow front coarse adjustment section with 27 DEG C/s fastly, using intermediate air-cooled 4.5s,
Then it is as cold as 470 DEG C of coiling temperature fastly with 23 DEG C/s through laminar flow rear portion accurate adjustment section；
(6) coiling process: 470 DEG C of coiling temperature.
The 540MPa grades high reaming steel SP252-540F steel band performance of the present embodiment Ti microalloying is shown in Table 2；Steel band metallographic group
It knits and sees Fig. 3.
Embodiment 4
The 540MPa grades high reaming steel SP252-540F finished steel sheet of the present embodiment Ti microalloying with a thickness of 2.0mm, chemistry at
It is grouped as and mass percentage is shown in Table 1.
The production method of the 540MPa grades high reaming steel SP252-540F steel band of the present embodiment Ti microalloying includes converter smelting
Refining, LF refining, continuous casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) continuous casting working procedure: by stablizing casting speed control component segregation, pulling rate 1.30m/min, continuous casting obtains thickness 200mm, width
The steel billet of 1350mm, continuous casting steel billet chemical component composition and its mass percentage are shown in Table 1；
(2) heating process: being 200min, heating furnace soaking zone in total time in furnace of heating furnace through stepped heating stove heating
1300 DEG C of heating temperature, soaking time 40min；
(3) roughing operation: the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, dephosphorization water pressure are 25MPa, gained
Intermediate sotck thinkness 30mm, batches through Coil Box and overturns end to end；
(4) finishing rolling step: rolling into the steel band with a thickness of 2.0mm through 7 passage finish rolling, and 1020 DEG C of entry temperature at finishing, finishing temperature
835℃；
(5) cooling process: steel band is first as cold as 710 DEG C through laminar flow front coarse adjustment section with 33 DEG C/s fastly, using intermediate air-cooled 6s, so
It is as cold as 460 DEG C of coiling temperature fastly with 21 DEG C/s by laminar flow rear portion accurate adjustment section；
(6) coiling process: 460 DEG C of coiling temperature.
The 540MPa grades high reaming steel SP252-540F steel band performance of the present embodiment Ti microalloying is shown in Table 2；Steel band metallographic group
It knits and sees Fig. 4.
Embodiment 5
The 540MPa grades high reaming steel SP252-540F finished steel sheet of the present embodiment Ti microalloying with a thickness of 2.3mm, chemistry at
It is grouped as and mass percentage is shown in Table 1.
The production method of the 540MPa grades high reaming steel SP252-540F steel band of the present embodiment Ti microalloying includes converter smelting
Refining, LF refining, continuous casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) continuous casting working procedure: by stablizing casting speed control component segregation, pulling rate 1.40m/min, continuous casting obtains thickness 200mm, width
The steel billet of 1400mm, continuous casting steel billet chemical component composition and its mass percentage are shown in Table 1；
(2) heating process: being 160min, heating furnace soaking zone in total time in furnace of heating furnace through stepped heating stove heating
1300 DEG C of heating temperature, soaking time 40min；
(3) roughing operation: the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, dephosphorization water pressure are 20MPa, gained
Intermediate sotck thinkness 31mm, batches through Coil Box and overturns end to end；
(4) finishing rolling step: rolling into the steel band with a thickness of 2.3mm through 7 passage finish rolling, and 1060 DEG C of entry temperature at finishing, finishing temperature
850℃；
(5) cooling process: steel band is first as cold as 710 DEG C through laminar flow front coarse adjustment section with 17 DEG C/s fastly, using intermediate air-cooled 5s, so
It is as cold as 470 DEG C of coiling temperature fastly with 21 DEG C/s by laminar flow rear portion accurate adjustment section；
(6) coiling process: 470 DEG C of coiling temperature.
The 540MPa grades high reaming steel SP252-540F steel band performance of the present embodiment Ti microalloying is shown in Table 2；Steel band metallographic group
It knits and sees Fig. 5.
Embodiment 6
The 540MPa grades high reaming steel SP252-540F finished steel sheet of the present embodiment Ti microalloying with a thickness of 2.8mm, chemistry at
It is grouped as and mass percentage is shown in Table 1.
The production method of the 540MPa grades high reaming steel SP252-540F steel band of the present embodiment Ti microalloying includes converter smelting
Refining, LF refining, continuous casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) continuous casting working procedure: by stablizing casting speed control component segregation, pulling rate 1.40m/min, continuous casting obtains thickness 190mm, width
The steel billet of 1200mm, continuous casting steel billet chemical component composition and its mass percentage are shown in Table 1；
(2) heating process: being 190min, heating furnace soaking zone in total time in furnace of heating furnace through stepped heating stove heating
1220 DEG C of heating temperature, soaking time 37min；
(3) roughing operation: the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, dephosphorization water pressure are 23MPa, gained
Intermediate sotck thinkness 32mm, batches through Coil Box and overturns end to end；
(4) finishing rolling step: rolling into the steel band with a thickness of 2.8mm through 7 passage finish rolling, and 1050 DEG C of entry temperature at finishing, finishing temperature
835℃；
(5) cooling process: steel band is first as cold as 708 DEG C through laminar flow front coarse adjustment section with 25 DEG C/s fastly, using intermediate air-cooled 3s, so
It is as cold as 465 DEG C of coiling temperature fastly with 22 DEG C/s by laminar flow rear portion accurate adjustment section；
(6) coiling process: 465 DEG C of coiling temperature.
The 540MPa grades high reaming steel SP252-540F steel band performance of the present embodiment Ti microalloying is shown in Table 2；Steel band metallographic group
It knits and sees Fig. 6.
Embodiment 7
The 540MPa grades high reaming steel SP252-540F finished steel sheet of the present embodiment Ti microalloying with a thickness of 2.5mm, chemistry at
It is grouped as and mass percentage is shown in Table 1.
The production method of the 540MPa grades high reaming steel SP252-540F steel band of the present embodiment Ti microalloying includes converter smelting
Refining, LF refining, continuous casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) continuous casting working procedure: by stablizing casting speed control component segregation, pulling rate 1.50m/min, continuous casting obtains thickness 210mm, width
The steel billet of 1260mm, continuous casting steel billet chemical component composition and its mass percentage are shown in Table 1；
(2) heating process: being 180min, heating furnace soaking zone in total time in furnace of heating furnace through stepped heating stove heating
1310 DEG C of heating temperature, soaking time 35min；
(3) roughing operation: the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, dephosphorization water pressure are 24MPa, gained
Intermediate sotck thinkness 34mm, batches through Coil Box and overturns end to end；
(4) finishing rolling step: rolling into the steel band with a thickness of 2.5mm through 7 passage finish rolling, and 1060 DEG C of entry temperature at finishing, finishing temperature
855℃；
(5) cooling process: steel band is first as cold as 694 DEG C through laminar flow front coarse adjustment section with 28 DEG C/s fastly, using intermediate air-cooled 3.5s,
Then it is as cold as 460 DEG C of coiling temperature fastly with 20 DEG C/s through laminar flow rear portion accurate adjustment section；
(6) coiling process: 460 DEG C of coiling temperature.
The 540MPa grades high reaming steel SP252-540F steel band performance of the present embodiment Ti microalloying is shown in Table 2；Steel band metallographic group
It knits and sees Fig. 7.
Embodiment 8
The 540MPa grades high reaming steel SP252-540F finished steel sheet of the present embodiment Ti microalloying with a thickness of 3.5mm, chemistry at
It is grouped as and mass percentage is shown in Table 1.
The production method of the 540MPa grades high reaming steel SP252-540F steel band of the present embodiment Ti microalloying includes converter smelting
Refining, LF refining, continuous casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) continuous casting working procedure: by stablizing casting speed control component segregation, pulling rate 1.35m/min, continuous casting obtains thickness 220mm, width
The steel billet of 1420mm, continuous casting steel billet chemical component composition and its mass percentage are shown in Table 1；
(2) heating process: being 200min, heating furnace soaking zone in total time in furnace of heating furnace through stepped heating stove heating
1310 DEG C of heating temperature, soaking time 48min；
(3) roughing operation: the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, dephosphorization water pressure are 21MPa, gained
Intermediate sotck thinkness 34mm, batches through Coil Box and overturns end to end；
(4) finishing rolling step: rolling into the steel band with a thickness of 3.5mm through 7 passage finish rolling, and 1060 DEG C of entry temperature at finishing, finishing temperature
860℃；
(5) cooling process: steel band is first as cold as 685 DEG C through laminar flow front coarse adjustment section with 19 DEG C/s fastly, using intermediate air-cooled 4.5s,
Then it is as cold as 475 DEG C of coiling temperature fastly with 30 DEG C/s through laminar flow rear portion accurate adjustment section；
(6) coiling process: 475 DEG C of coiling temperature.
The 540MPa grades high reaming steel SP252-540F steel band performance of the present embodiment Ti microalloying is shown in Table 2；Steel band metallographic group
It knits and sees Fig. 8.
Embodiment 9
The 540MPa grades high reaming steel SP252-540F finished steel sheet of the present embodiment Ti microalloying with a thickness of 3.0mm, chemistry at
It is grouped as and mass percentage is shown in Table 1.
The production method of the 540MPa grades high reaming steel SP252-540F steel band of the present embodiment Ti microalloying includes converter smelting
Refining, LF refining, continuous casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) continuous casting working procedure: by stablizing casting speed control component segregation, pulling rate 1.30m/min, continuous casting obtains thickness 180mm, width
The steel billet of 1320mm, continuous casting steel billet chemical component composition and its mass percentage are shown in Table 1；
(2) heating process: being 180min, heating furnace soaking zone in total time in furnace of heating furnace through stepped heating stove heating
1280 DEG C of heating temperature, soaking time 48min；
(3) roughing operation: the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, dephosphorization water pressure are 22MPa, gained
Intermediate sotck thinkness 30mm, batches through Coil Box and overturns end to end；
(4) finishing rolling step: rolling into the steel band with a thickness of 3.0mm through 7 passage finish rolling, and 1040 DEG C of entry temperature at finishing, finishing temperature
835℃；
(5) cooling process: steel band is first as cold as 700 DEG C through laminar flow front coarse adjustment section with 35 DEG C/s fastly, using intermediate air-cooled 5.5s,
Then it is as cold as 470 DEG C of coiling temperature fastly with 15 DEG C/s through laminar flow rear portion accurate adjustment section；
(6) coiling process: 470 DEG C of coiling temperature.
The 540MPa grades high reaming steel SP252-540F steel band performance of the present embodiment Ti microalloying is shown in Table 2；Steel band metallographic group
It knits and sees Fig. 9.
Embodiment 10
The 540MPa grades high reaming steel SP252-540F finished steel sheet of the present embodiment Ti microalloying with a thickness of 3.2mm, chemistry at
It is grouped as and mass percentage is shown in Table 1.
The production method of the 540MPa grades high reaming steel SP252-540F steel band of the present embodiment Ti microalloying includes converter smelting
Refining, LF refining, continuous casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) continuous casting working procedure: by stablizing casting speed control component segregation, pulling rate 1.30m/min, continuous casting obtains thickness 230mm, width
The steel billet of 1360mm, continuous casting steel billet chemical component composition and its mass percentage are shown in Table 1；
(2) heating process: being 150min, heating furnace soaking zone in total time in furnace of heating furnace through stepped heating stove heating
1210 DEG C of heating temperature, soaking time 35min；
(3) roughing operation: the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, dephosphorization water pressure are 20MPa, gained
Intermediate sotck thinkness 34mm, batches through Coil Box and overturns end to end；
(4) finishing rolling step: rolling into the steel band with a thickness of 3.2mm through 7 passage finish rolling, and 1060 DEG C of entry temperature at finishing, finishing temperature
820℃；
(5) cooling process: steel band is first as cold as 720 DEG C through laminar flow front coarse adjustment section with 15 DEG C/s fastly, using intermediate air-cooled 4s, so
It is as cold as 470 DEG C of coiling temperature fastly with 35 DEG C/s by laminar flow rear portion accurate adjustment section；
(6) coiling process: 470 DEG C of coiling temperature.
The 540MPa grades high reaming steel SP252-540F steel band performance of the present embodiment Ti microalloying is shown in Table 2；Steel band metallographic group
It knits and sees Figure 10.
The chemical component of 540MPa grades of the Ti microalloying high reaming steel SP252-540F steel band of 1 embodiment 1-10 of table forms
And its mass percentage (%)
Ingredient surplus is iron and inevitable impurity in table 1.
The mechanical property of 540MPa grades of the Ti microalloying high reaming steel SP252-540F steel band of 2 embodiment 1-10 of table
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to the present invention into
Go detailed description, those skilled in the art should understand that: it can still modify to the present invention or equally replace
It changes, without departing from the spirit or scope of the invention, or any substitutions, should all cover and be wanted in right of the invention
It asks in range.
Claims (9)
1. a kind of 540MPa grades of Ti microalloying high reaming steel steel bands, which is characterized in that steel band chemical component composition and its
Mass percentage are as follows: C:0.07~0.11%, Mn:1.00~1.30%, S≤0.015%, P≤0.020%, Si:0.05~
0.12%, Als:0.015~0.040%, Ti:0.020~0.040%, N≤0.0050%, Ceq:0.30~0.36%, surplus are iron
With inevitable impurity.
2. 540MPa grades of a kind of Ti microalloying high reaming steel steel bands according to claim 1, which is characterized in that the steel
Tape thickness is 1.8~3.5mm.
3. 540MPa grades of a kind of Ti microalloying high reaming steel steel bands according to claim 1, which is characterized in that the steel
Band tensile strength ReH>=540MPa, yield strength Rm: 365~500MPa, elongation after fracture A50: 23~37%, hole expansibility >=80%.
4. the producer based on a kind of 540MPa grades high reaming steel steel band of Ti microalloying described in claim 1-3 any one
Method, which is characterized in that the production method includes converter smelting, LF refining, continuous casting, heating, roughing, finish rolling, cooling and batches
Process；The cooling process, steel band is first as cold as 680~720 DEG C through laminar flow front coarse adjustment section with 15~35 DEG C/s fastly, in
Between air-cooled 3~6s, be then as cold as 460~520 DEG C of coiling temperature fastly through laminar flow rear portion accurate adjustment section with 15~35 DEG C/s.
5. a kind of production method of 540MPa grades of Ti microalloying high reaming steel steel bands according to claim 4, feature
It is, the coiling process, 460~520 DEG C of coiling temperature.
6. a kind of production method of 540MPa grades of Ti microalloying high reaming steel steel bands according to claim 4, feature
It is, the continuous casting working procedure, slab width≤1300mm, pulling rate are 1.40~1.50m/min, slab width ﹥ 1300mm, pulling rate
For 1.30~1.40m/min, continuous casting obtains the steel billet of 180~230mm of thickness；Continuous casting steel billet chemical component composition and its quality hundred
Divide content are as follows: C:0.07~0.11%, Mn:1.00~1.30%, S≤0.015%, P≤0.020%, Si:0.05~0.12%, Als:
0.015~0.040%, Ti:0.020~0.040%, N≤0.0050%, Ceq:0.30~0.36%, surplus is for iron and unavoidably
Impurity.
7. a kind of producer of 540MPa grades of Ti microalloying high reaming steel steel bands according to claim 4-6 any one
Method, which is characterized in that the heating process, through stepped heating stove heating, total time in furnace of heating furnace be 150~
200min, 1210~1310 DEG C of heating furnace soaking zone heating temperature, 35~48min of soaking time.
8. a kind of producer of 540MPa grades of Ti microalloying high reaming steel steel bands according to claim 4-6 any one
Method, which is characterized in that the roughing operation, the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, dephosphorization water pressure
It batches through Coil Box and overturns end to end for 20~25MPa, gained centre 30~34mm of sotck thinkness.
9. a kind of producer of 540MPa grades of Ti microalloying high reaming steel steel bands according to claim 4-6 any one
Method, which is characterized in that the finishing rolling step rolls into the steel band with a thickness of 1.8~3.5mm, entry temperature at finishing through 7 passage finish rolling
1020~1060 DEG C, 820~860 DEG C of finishing temperature.
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