CN110306124A - 620MPa grades of hot rolled strips of inexpensive Ti microalloying and production method - Google Patents
620MPa grades of hot rolled strips of inexpensive Ti microalloying and production method Download PDFInfo
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- CN110306124A CN110306124A CN201910661500.2A CN201910661500A CN110306124A CN 110306124 A CN110306124 A CN 110306124A CN 201910661500 A CN201910661500 A CN 201910661500A CN 110306124 A CN110306124 A CN 110306124A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- 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
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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Abstract
The invention discloses a kind of 620MPa grades of hot rolled strips of low cost Ti microalloying and production methods, steel band chemical component composition and its mass percentage are as follows: C:0.15~0.18%, Mn:1.00~1.35%, S≤0.015%, P≤0.020%, Si:0.15~0.25%, Als:0.025~0.050%, Ti:0.08~0.12%, N≤0.0050%, CEV:0.37~0.43%, surplus are iron and inevitable impurity；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, the design of titanium microalloying ingredient, and by cooling path, medium temperature coiling coater, 620MPa grades of hot rolled strips of gained Ti microalloying are suitble to production dumper vehicle bottom, lorry side bar, through cold roll formings light-gauge steel sections such as beams.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of 620MPa grades of hot rolled strips of low cost Ti microalloying and
Production method.
Background technique
Raising with automobile market to the requirements such as energy-saving and environmental protection, safety, comfortable, Vehicle mass reduction become current
The important development direction of automotive technology development.Since high-strength steel and super-high strength steel are while mitigating car body weight, moreover it is possible to improve
The structural strength and energy absorption capability of body of a motor car, therefore high-strength steel and super-high strength steel are still most economical, most effective light
One of quantization approach.
With the development of automobile industry, domestic dumper lightweight development, more and more dumpers in order to mitigate weight,
Structure uses yield strength 620MPa or more, and tensile strength 710~880MPa grade 1.5~3.0mm thin-walled cold-rolled forming section structure is set
Meter substitution hot rolling think gauge high-strength steel.By taking lorry side bar as an example, high-strength steel side's Rectangular Welded Pipe is used, in welded tube cold roll forming mistake
Cheng Zhong, intensity are increased, and elongation percentage sharp fall, to guarantee that high-strength steel side's Rectangular Welded Pipe reaches lorry steel elongation percentage
>=10% requirement, the elongation percentage of high-strength steel band should be not less than 15%, and strength and ductility product is not less than 12GPa%, and yield tensile ratio is not higher than 0.90.
Since Nb, V V-N steel or the high-strength hot-rolled steel band rolling drag of Nb-V-Ti complex intensifying are larger, ultra-thin gauge rolling compares
Difficulty, technology are difficult to meet above-mentioned performance requirement, exist simultaneously thickness price markup, and benefit is lower.
620MPa grades of hot-rolled steels of inexpensive Ti microalloying of the reference national standard GB/T 1591-2018 currently studied
Band product can reduce the thickness using steel plate while improving bus body strength, mitigate complete vehicle weight, reduce vehicle fuel and disappear
Consumption has important Development volue.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of 620MPa grades of hot rolled strips of low cost Ti microalloying and lifes
Production method.The invention passes through cooling path, medium temperature coiling coater, institute using low-carbon, conventional manganese, the design of titanium microalloying ingredient
620MPa grades of hot rolled strips of Ti microalloying are obtained to be suitble to produce dumper vehicle bottom, lorry side bar, run through the cold roll formings thin-walleds such as beam
Fashioned iron is conducive to mitigate car body weight, reduces fuel consumption, realize the green manufacturing of product.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of low cost Ti microalloying 620MPa
Grade hot rolled strip, the steel band chemical component composition and its mass percentage are as follows: C:0.15~0.18%, Mn:1.00~
1.35%, S≤0.015%, P≤0.020%, Si:0.15~0.25%, Als:0.025~0.050%, Ti:0.080~0.120%, N
≤ 0.0050%, CEV:0.37~0.43%, surplus are iron and inevitable impurity.
Thickness of strips of the present invention is 1.5~3.0mm.
Steel band yield strength ReH >=620MPa of the present invention, tensile strength Rm:710~880MPa, yield tensile ratio≤
0.90, elongation after fracture A >=15%, strength and ductility product >=12GPa%.
The present invention also provides a kind of production method of low cost 620MPa grades of hot rolled strips of Ti microalloying, the productions
Method includes converter smelting, LF refining, continuous casting, heating, roughing, finish rolling, cooling and coiling process；The cooling process, steel band
It is first 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 through laminar flow
Accurate adjustment section in rear portion is as cold as 520~580 DEG C of coiling temperature with 15~35 DEG C/s fastly.
Coiling process of the present invention, 520~580 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:0.15~0.18%, Mn:1.00~1.35%, S
≤ 0.015%, P≤0.020%, Si:0.15~0.25%, Als:0.025~0.050%, Ti:0.080~0.120%, N≤
0.0050%, CEV:0.37~0.43%, 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 160~
210min, 1220~1310 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 30~36mm of sotck thinkness.
Finishing rolling step of the present invention rolls into the steel band with a thickness of 1.5~3.0mm, entry temperature at finishing through 7 passage finish rolling
1020~1080 DEG C, 815~855 DEG C of finishing temperature.
The beneficial effects of adopting the technical scheme are that the 1, present invention is using low-carbon, conventional manganese, titanium micro-alloyed
Meter is set up in chemical conversion separately, by cooling path clustering, adjusts the partition of steel C in phase transition process, improves elongation percentage, by controlling medium temperature
It batches, control F changes ratio, the F+B tissue of available better performances to P, to obtain higher tensile strength and good
Elongation percentage, solve Nb, V V-N steel or Nb-V-Ti complex intensifying high-strength hot-rolled steel band rolling drag be larger, it is thin
Specification rolls relatively difficult problem.2,620MPa grades of hot rolled strip yield strength ReH of Ti microalloying produced by the invention >=
620MPa, tensile strength Rm:710~880MPa, yield tensile ratio≤0.90, elongation after fracture A >=15%, strength and ductility product >=12GPa%, tool
Have higher intensity, good elongation percentage and processability, be suitble to production dumper vehicle bottom, lorry side bar, through the clod washes such as beam at
Type light-gauge steel section can meet its mechanical property and forming requirements.3,620MPa grades of hot-rolled steels of Ti microalloying produced by the invention
Band is conducive to mitigate car body weight, reduces fuel consumption, reduces motor vehicle exhaust emission, realizes the green manufacturing of product.
Detailed description of the invention
Fig. 1 is the metallographic structure figure of 1 620MPa grades of hot rolled strip Q620M of Ti microalloying of embodiment；
Fig. 2 is the metallographic structure figure of 2 620MPa grades of hot rolled strip Q620M of Ti microalloying of embodiment；
Fig. 3 is the metallographic structure figure of 3 620MPa grades of hot rolled strip Q620M of Ti microalloying of embodiment；
Fig. 4 is the metallographic structure figure of 4 620MPa grades of hot rolled strip Q620M of Ti microalloying of embodiment；
Fig. 5 is the metallographic structure figure of 5 620MPa grades of hot rolled strip Q620M of Ti microalloying of embodiment；
Fig. 6 is the metallographic structure figure of 6 620MPa grades of hot rolled strip Q620M of Ti microalloying of embodiment；
Fig. 7 is the metallographic structure figure of 7 620MPa grades of hot rolled strip Q620M of Ti microalloying of embodiment；
Fig. 8 is the metallographic structure figure of 8 620MPa grades of hot rolled strip Q620M of Ti microalloying of embodiment；
Fig. 9 is the metallographic structure figure of 9 620MPa grades of hot rolled strip Q620M of Ti microalloying of embodiment；
Figure 10 is the metallographic structure figure of 10 620MPa grades of hot rolled strip Q620M of 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
620MPa grades of hot rolled strip Q620M finished product thicknesses of the present embodiment Ti microalloying are 1.5mm, chemical component composition and matter
Amount percentage composition is shown in Table 1.
The production method of the present embodiment Ti microalloying 620MPa hot rolled strip Q620M includes converter smelting, LF refining, company
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
1300 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 1.5mm through 7 passage finish rolling, and 1070 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 25 DEG C/s fastly, using intermediate air-cooled 5s, so
It is as cold as 550 DEG C of coiling temperature fastly with 17 DEG C/s by laminar flow rear portion accurate adjustment section；
(6) coiling process: 550 DEG C of coiling temperature.
620MPa grades of hot rolled strip Q620M performances of the present embodiment Ti microalloying are shown in Table 2；Fig. 1 is shown in steel band metallographic structure.
Embodiment 2
620MPa grades of hot rolled strip Q620M finished product thicknesses of the present embodiment Ti microalloying are 1.8mm, chemical component composition and matter
Amount percentage composition is shown in Table 1.
The production method of 620MPa grades of hot rolled strip Q620M of the present embodiment Ti microalloying include converter smelting, 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 208min, 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 1.8mm through 7 passage finish rolling, and 1080 DEG C of entry temperature at finishing, finishing temperature
855℃；
(5) cooling process: steel band is first as cold as 680 DEG C through laminar flow front coarse adjustment section with 32 DEG C/s fastly, using intermediate air-cooled 3s, so
It is as cold as 520 DEG C of coiling temperature fastly with 20 DEG C/s by laminar flow rear portion accurate adjustment section；
(6) coiling process: 520 DEG C of coiling temperature.
620MPa grades of hot rolled strip Q620M performances of the present embodiment Ti microalloying are shown in Table 2；Fig. 2 is shown in steel band metallographic structure.
Embodiment 3
620MPa grades of hot rolled strip Q620M finished product thicknesses of the present embodiment Ti microalloying are 2.0mm, chemical component composition and matter
Amount percentage composition is shown in Table 1.
The production method of 620MPa grades of hot rolled strip Q620M of the present embodiment Ti microalloying include converter smelting, 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 210min, 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 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 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 18 DEG C/s fastly, using intermediate air-cooled 4.5s,
Then it is as cold as 580 DEG C of coiling temperature fastly with 23 DEG C/s through laminar flow rear portion accurate adjustment section；
(6) coiling process: 580 DEG C of coiling temperature.
620MPa grades of hot rolled strip Q620M performances of the present embodiment Ti microalloying are shown in Table 2；Fig. 3 is shown in steel band metallographic structure.
Embodiment 4
620MPa grades of hot rolled strip Q620M finished product thicknesses of the present embodiment Ti microalloying are 2.0mm, chemical component composition and matter
Amount percentage composition is shown in Table 1.
The production method of 620MPa grades of hot rolled strip Q620M of the present embodiment Ti microalloying include converter smelting, 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
815℃；
(5) cooling process: steel band is first as cold as 710 DEG C through laminar flow front coarse adjustment section with 24 DEG C/s fastly, using intermediate air-cooled 6s, so
It is as cold as 530 DEG C of coiling temperature fastly with 19 DEG C/s by laminar flow rear portion accurate adjustment section；
(6) coiling process: 530 DEG C of coiling temperature.
620MPa grades of hot rolled strip Q620M performances of the present embodiment Ti microalloying are shown in Table 2；Fig. 4 is shown in steel band metallographic structure.
Embodiment 5
620MPa grades of hot rolled strip Q620M finished product thicknesses of the present embodiment Ti microalloying are 2.3mm, chemical component composition and matter
Amount percentage composition is shown in Table 1.
The production method of 620MPa grades of hot rolled strip Q620M of the present embodiment Ti microalloying include converter smelting, 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 580 DEG C of coiling temperature fastly with 25 DEG C/s by laminar flow rear portion accurate adjustment section；
(6) coiling process: 580 DEG C of coiling temperature.
620MPa grades of hot rolled strip Q620M performances of the present embodiment Ti microalloying are shown in Table 2；Fig. 5 is shown in steel band metallographic structure.
Embodiment 6
620MPa grades of hot rolled strip Q620M finished product thicknesses of the present embodiment Ti microalloying are 2.3mm, chemical component composition and matter
Amount percentage composition is shown in Table 1.
The production method of 620MPa grades of hot rolled strip Q620M of the present embodiment Ti microalloying include converter smelting, 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 2.3mm through 7 passage finish rolling, and 1050 DEG C of entry temperature at finishing, finishing temperature
830℃；
(5) cooling process: steel band is first as cold as 708 DEG C through laminar flow front coarse adjustment section with 33 DEG C/s fastly, using intermediate air-cooled 3s, so
It is as cold as 540 DEG C of coiling temperature fastly with 21 DEG C/s by laminar flow rear portion accurate adjustment section；
(6) coiling process: 540 DEG C of coiling temperature.
620MPa grades of hot rolled strip Q620M performances of the present embodiment Ti microalloying are shown in Table 2；Fig. 6 is shown in steel band metallographic structure.
Embodiment 7
620MPa grades of hot rolled strip Q620M finished product thicknesses of the present embodiment Ti microalloying are 2.5mm, chemical component composition and matter
Amount percentage composition is shown in Table 1.
The production method of 620MPa grades of hot rolled strip Q620M of the present embodiment Ti microalloying include converter smelting, 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 1080 DEG C of entry temperature at finishing, finishing temperature
835℃；
(5) cooling process: steel band is first as cold as 694 DEG C through laminar flow front coarse adjustment section with 22 DEG C/s fastly, using intermediate air-cooled 3.5s,
Then it is as cold as 560 DEG C of coiling temperature fastly with 34 DEG C/s through laminar flow rear portion accurate adjustment section；
(6) coiling process: 560 DEG C of coiling temperature.
620MPa grades of hot rolled strip Q620M performances of the present embodiment Ti microalloying are shown in Table 2；Fig. 7 is shown in steel band metallographic structure.
Embodiment 8
620MPa grades of hot rolled strip Q620M finished product thicknesses of the present embodiment Ti microalloying are 2.5mm, chemical component composition and matter
Amount percentage composition is shown in Table 1.
The production method of 620MPa grades of hot rolled strip Q620M of the present embodiment Ti microalloying include converter smelting, 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 210min, 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 35mm, 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 1065 DEG C of entry temperature at finishing, finishing temperature
845℃；
(5) cooling process: steel band is first as cold as 685 DEG C through laminar flow front coarse adjustment section with 26 DEG C/s fastly, using intermediate air-cooled 4.5s,
Then it is as cold as 555 DEG C of coiling temperature fastly with 20 DEG C/s through laminar flow rear portion accurate adjustment section；
(6) coiling process: 555 DEG C of coiling temperature.
620MPa grades of hot rolled strip Q620M performances of the present embodiment Ti microalloying are shown in Table 2；Fig. 8 is shown in steel band metallographic structure.
Embodiment 9
620MPa grades of hot rolled strip Q620M finished product thicknesses of the present embodiment Ti microalloying be 2.75mm, chemical component composition and
Mass percentage is shown in Table 1.
The production method of 620MPa grades of hot rolled strip Q620M of the present embodiment Ti microalloying include converter smelting, 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 2.75mm through 7 passage finish rolling, and 1040 DEG C of entry temperature at finishing, finishing temperature
820℃；
(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 530 DEG C of coiling temperature fastly with 15 DEG C/s through laminar flow rear portion accurate adjustment section；
(6) coiling process: 530 DEG C of coiling temperature.
620MPa grades of hot rolled strip Q620M performances of the present embodiment Ti microalloying are shown in Table 2；Fig. 9 is shown in steel band metallographic structure.
Embodiment 10
620MPa grades of hot rolled strip Q620M finished product thicknesses of the present embodiment Ti microalloying are 3.0mm, chemical component composition and matter
Amount percentage composition is shown in Table 1.
The production method of 620MPa grades of hot rolled strip Q620M of the present embodiment Ti microalloying include converter smelting, 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 210min, 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 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 36mm, 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 1060 DEG C of entry temperature at finishing, finishing temperature
855℃；
(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 570 DEG C of coiling temperature fastly with 35 DEG C/s by laminar flow rear portion accurate adjustment section；
(6) coiling process: 570 DEG C of coiling temperature.
620MPa grades of hot rolled strip Q620M performances of the present embodiment Ti microalloying are shown in Table 2；Figure 10 is shown in steel band metallographic structure.
The chemical component of 1 620MPa grades of hot rolled strip Q620M of embodiment 1-10 Ti microalloying of table forms and its quality
Percentage composition (%)
Ingredient surplus is iron and inevitable impurity in table 1.
The mechanical property of 2 620MPa grades of hot rolled strip Q620M of embodiment 1-10 Ti microalloying 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 620MPa grades of hot rolled strips of low cost Ti microalloying, which is characterized in that steel band chemical component composition and
Its mass percentage are as follows: C:0.15~0.18%, Mn:1.00~1.35%, S≤0.015%, P≤0.020%, Si:0.15~
0.25%, Als:0.025~0.050%, Ti:0.080~0.120%, N≤0.0050%, CEV:0.37~0.43%, surplus are iron
With inevitable impurity.
2. a kind of 620MPa grades of hot rolled strips of low cost Ti microalloying according to claim 1, which is characterized in that described
Thickness of strips is 1.5~3.0mm.
3. a kind of 620MPa grades of hot rolled strips of low cost Ti microalloying according to claim 1, which is characterized in that described
Steel band yield strength ReH >=620MPa, tensile strength Rm:710~880MPa, yield tensile ratio≤0.90, elongation after fracture A >=15%,
Strength and ductility product >=12GPa%.
4. the production based on a kind of low cost 620MPa grades of hot rolled strips 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 volume
Take process；The cooling process, steel band are first as cold as 680~720 DEG C through laminar flow front coarse adjustment section with 15~35 DEG C/s fastly, using
Intermediate air-cooled 3~6s, is then as cold as 520~580 DEG C of coiling temperature through laminar flow rear portion accurate adjustment section with 15~35 DEG C/s fastly.
5. a kind of production method of low cost 620MPa grades of hot rolled strips of Ti microalloying according to claim 4, special
Sign is, the coiling process, 520~580 DEG C of coiling temperature.
6. a kind of production method of low cost 620MPa grades of hot rolled strips of Ti microalloying according to claim 4, special
Sign is that the continuous casting working procedure, slab width≤1300mm, pulling rate are 1.40~1.50m/min, slab width ﹥ 1300mm, draws
Speed is 1.30~1.40m/min, and continuous casting obtains the steel billet of 180~230mm of thickness；Continuous casting steel billet chemical component composition and its quality
Percentage composition are as follows: C:0.15~0.18%, Mn:1.00~1.35%, S≤0.015%, P≤0.020%, Si:0.15~0.25%,
Als:0.025~0.050%, Ti:0.080~0.120%, N≤0.0050%, CEV:0.37~0.43%, surplus are iron and can not
The impurity avoided.
7. a kind of production of low cost 620MPa grades of hot rolled strips of Ti microalloying 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 160~
210min, 1220~1310 DEG C of heating furnace soaking zone heating temperature, 35~48min of soaking time.
8. a kind of production of low cost 620MPa grades of hot rolled strips of Ti microalloying 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 hydraulic pressure
Power is 20~25MPa, and 30~36mm of sotck thinkness among gained is batched through Coil Box and overturned end to end.
9. a kind of production of low cost 620MPa grades of hot rolled strips of Ti microalloying 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 1.5~3.0mm, finish rolling entrance temperature through 7 passage finish rolling
1020~1080 DEG C, 815~855 DEG C of finishing temperature of degree.
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