CN107012397A - A kind of 340MPa grades of high-strength IF steel and its production method - Google Patents
A kind of 340MPa grades of high-strength IF steel and its production method Download PDFInfo
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- CN107012397A CN107012397A CN201710163920.9A CN201710163920A CN107012397A CN 107012397 A CN107012397 A CN 107012397A CN 201710163920 A CN201710163920 A CN 201710163920A CN 107012397 A CN107012397 A CN 107012397A
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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
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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
- C21D8/0236—Cold rolling
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- 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%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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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- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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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- 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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Abstract
The invention discloses a kind of 340MPa grades of high-strength IF steel and its production method, the high-strength IF steel chemical composition and weight/mass percentage composition are：C≤0.0050%, Si≤0.03%, Mn：0.15~0.35%, P：0.035~0.055%, S≤0.008%, Als：0.025~0.055%, Nb：0.025~0.040%, Ti：0.030~0.045%, B：0.0005~0.0015%, N≤0.0050%, remaining is iron and inevitably micro-.Production method include steel-making, continuous casting, heating of plate blank, hot rolling, section cooling, acid roll, continuous annealing, smooth process.The present invention by rational composition design and match corresponding hot rolling, acid roll, continuous annealing process, obtain a kind of 340MPa grades of high-strength IF steel, tensile strength >=340MPa, the 230MPa of yield strength 180, elongation percentage A80 >=36%.
Description
Technical field
This hair belongs to iron and steel smelting technology field, and in particular to a kind of 340MPa grades of high-strength IF steel and its production method.
Background technology
IF steel is gapless atomic steel, is in ultra-low-carbon steel, to add the strong carboritride formation element such as niobium, titanium,
The interstitial atoms such as the carbon in steel, nitrogen are completely fixed for carboritride, so that the clean ferritic steel of gap-free atom is obtained,
Because it has excellent deep drawability, it is used widely in automobile industry.And high-strength IF steel is that in IF steel, addition is certain
The elements such as phosphorus, manganese, the silicon of amount, improve intensity using its solution strengthening effect, maintain higher plasticity.
Patent of invention CN104233064B discloses a kind of 170MPa grades cold rolling phosphorate IF high-strength steel and its production method,
CN104561788A discloses phosphorous high-strength IF steel and its production method, using bell-type annealing technique.With it is continuous
Annealing is compared, and the bell-type annealing time is long, more phosphorus precipitated phase such as FeTiP can be formed, to the mechanical performance and mouldability of material
Can be unfavorable, simultaneously because the precipitation of phosphorous phase can weaken the solid solution strengthening effect of phosphorus.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of 340MPa grades of high-strength IF steel；Present invention also offers one kind
The production method of 340MPa grades of high-strength IF steels.The present invention by rational composition design and match corresponding hot rolling, acid roll, continuous annealing
Technique, obtains a kind of 340MPa grades of high-strength IF steel, with good combination property.
In order to solve the above technical problems, the invention provides a kind of 340MPa grades of high-strength IF steel, the high-strength IF steel chemistry
Composition and weight/mass percentage composition are：C≤0.0050%, Si≤0.03%, Mn：0.15~0.35%, P：0.035~0.055%, S≤
0.008%, Als：0.025~0.055%, Nb：0.025~0.040 %, Ti：0.030~0.045%, B：0.0005~
0.0015%, N≤0.0050%, remaining is iron and inevitably micro-.
High-strength IF steel tensile strength >=340MPa of the present invention, 180~230MPa of yield strength, elongation percentage A80 >=
36%。
Present invention also offers a kind of production method of 340MPa grades of high-strength IF steel, it includes steel-making, continuous casting, slab and added
Heat, hot rolling, section cooling, acid are rolled, continuous annealing, smooth process, the steel making working procedure, tapping ladle chemistry and quality percentage contain
Measure and be：C≤0.0050%, Si≤0.03%, Mn：0.15~0.35%, P：0.035~0.055%, S≤0.008%, Als：0.025
~0.055%, Nb：0.025~0.040 %, Ti：0.030~0.045%, B：0.0005~0.0015%, N≤0.0050%, remaining
It is for iron and inevitably micro-.
Heating of plate blank process of the present invention, is divided into a bringing-up section, two bringing-up sections, three bringing-up sections and soaking zone, and slab exists
120~150min of stove time, three 1220~1300 DEG C of bringing-up section temperature, 1200~1280 DEG C of soaking zone temperature.
Hot-rolled process of the present invention, is divided into single chassis roughing, Coil Box and 7 frame finish rolling, wherein roughing is reciprocating
Workpiece thickness is 40~45mm after rolling, last passes；The finishing temperature control of 7 frame finish rolling is at 900~930 DEG C.
Section cooling process of the present invention, is cooled down using leading portion, by the way of afterbody fine setting, the control of leading portion cooling velocity exists
60~80 DEG C/s, oiler temperature control is at 680~720 DEG C.
Acid of the present invention rolls process, and acid rolls reduction ratio >=65%.
Continuous annealing process of the present invention, be divided into preheating section, heating one section, heating two sections, soaking zone, slow cooling section, rapid cooling section,
Aging section and cold section eventually, wherein two sections of heating and soaking zone temperature control are at 820~840 DEG C, slow cooling section temperature control 660~
700 DEG C, rapid cooling section temperature control is at 380~420 DEG C, and aging section temperature control is at 360~400 DEG C.
Smooth process of the present invention, smooth elongation percentage point specifications control is 0.6~1.2%.
340MPa grades of high-strength IF steel examination criterias refer to EN 10268.
It is using the beneficial effect produced by above-mentioned technical proposal：1st, the present invention is ultralow by rational composition design
Carbon, P, Mn solution strengthening, while adding the interstitial atoms such as C, N that Nb, Ti are fixed in steel, rolled by matching corresponding hot rolling, acid,
Continuous annealing process, obtains a kind of 340MPa grades of high-strength IF steel.2nd, product has a good combination property, tensile strength >=340MPa,
Yield strength 180-230MPa, elongation percentage A80 >=36%.
Embodiment
With reference to specific embodiment, the present invention is further detailed explanation.
Present invention 340MPa grades of high-strength IF steel methods of production include steel-making, continuous casting, heating of plate blank, hot rolling, section cooling, acid
Roll, continuous annealing, smooth process, concrete technology step is as follows：
1）Steel making working procedure：Tapping ladle chemistry and weight/mass percentage composition are：C≤0.0050%, Si≤0.03%, Mn：0.15
~0.35%, P：0.035~0.055%, S≤0.008%, Als：0.025~0.055%, Nb：0.025~0.040 %, Ti：
0.030~0.045%, B：0.0005~0.0015%, N≤0.0050%, remaining is iron and inevitably micro-.
2）Continuous casting working procedure：Using whole argon gas protective casting, using dynamic soft-reduction, liquid level fluctuation of crystallizer stability contorting
In ± 2mm.
3）Heating of plate blank process：Heating of plate blank process of the present invention, is divided into a bringing-up section, two bringing-up sections, three bringing-up sections
And soaking zone, 120~150min of slab time inside furnace, three 1220~1300 DEG C of bringing-up section temperature, soaking zone temperature 1200~
1280℃。
4）Hot-rolled process：It is divided into single chassis roughing, Coil Box and 7 frame finish rolling, wherein roughing is reciprocating rolling, extreme trace
Workpiece thickness is 40~45mm after secondary rolling；The finishing temperature control of 7 frame finish rolling is at 900~930 DEG C.
5）Section cooling process：Section cooling process of the present invention, is cooled down using leading portion, by the way of afterbody fine setting, preceding
Section cooling velocity control is in 60~80 DEG C/s, and oiler temperature control is at 680~720 DEG C.
6）Acid rolls process：Acid rolls reduction ratio >=65%.
7）Continuous annealing process：Be divided into preheating section, heating one section, heating two sections, soaking zone, slow cooling section, rapid cooling section, aging section and
Cold section eventually, wherein two sections of heating and soaking zone temperature control are at 820~840 DEG C, slow cooling section temperature control is at 660~700 DEG C, soon
Cold section of temperature control is at 380~420 DEG C, and aging section temperature control is at 360~400 DEG C.
8）Smooth process：Smooth elongation percentage point specifications control is 0.6~1.2%.
Embodiment 1
This 340MPa grades of high-strength IF steels, product thickness 0.8mm, chemical composition and weight/mass percentage composition are shown in Table 1, and mechanical property is shown in Table
2。
Production method include steel-making, continuous casting, heating of plate blank, hot rolling, section cooling, acid roll, continuous annealing, smooth process, specifically
Processing step is as follows：
1）Steel making working procedure：Tapping ladle chemistry and weight/mass percentage composition are shown in Table 1, and remaining is iron and inevitable micro member
Element.
2）Continuous casting working procedure：Using whole argon gas protective casting, using dynamic soft-reduction, liquid level fluctuation of crystallizer stability contorting
In ± 2mm.
3）Heating of plate blank process：Heating of plate blank 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 135min, three 1260 DEG C of bringing-up section temperature, 1200 DEG C of soaking zone temperature.
4）Hot-rolled process：It is divided into single chassis roughing, Coil Box and 7 frame finish rolling, wherein roughing is reciprocating rolling, extreme trace
Workpiece thickness is 40mm after secondary rolling；The finishing temperature control of 7 frame finish rolling is at 900 DEG C.
5）Section cooling process：Section cooling process of the present invention, is cooled down using leading portion, by the way of afterbody fine setting, preceding
Section cooling velocity control is in 80 DEG C/s, and oiler temperature control is at 690 DEG C.
6）Acid rolls process：Acid rolls reduction ratio 80%.
7）Continuous annealing process：Be divided into preheating section, heating one section, heating two sections, soaking zone, slow cooling section, rapid cooling section, aging section and
Cold section eventually, wherein two sections of heating and soaking zone temperature control are at 820 DEG C, slow cooling section temperature control is in 660 DEG C, rapid cooling section temperature control
System is at 380 DEG C, and aging section temperature control is at 390 DEG C.
8）Smooth process：Smooth elongation percentage point specifications control is 0.6%.
Embodiment 2
This 340MPa grades of high-strength IF steels, product thickness 1.0mm, chemical composition and weight/mass percentage composition are shown in Table 1, and mechanical property is shown in Table
2。
Production method include steel-making, continuous casting, heating of plate blank, hot rolling, section cooling, acid roll, continuous annealing, smooth process, specifically
Processing step is as follows：
1）Steel making working procedure：Tapping ladle chemistry and weight/mass percentage composition are shown in Table 1, and remaining is iron and inevitable micro member
Element.
2）Continuous casting working procedure：Using whole argon gas protective casting, using dynamic soft-reduction, liquid level fluctuation of crystallizer stability contorting
In ± 2mm.
3）Heating of plate blank process：Heating of plate blank 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 130min, three 1220 DEG C of bringing-up section temperature, 1255 DEG C of soaking zone temperature.
4）Hot-rolled process：It is divided into single chassis roughing, Coil Box and 7 frame finish rolling, wherein roughing is reciprocating rolling, extreme trace
Workpiece thickness is 40mm after secondary rolling；The finishing temperature control of 7 frame finish rolling is at 905 DEG C.
5）Section cooling process：Section cooling process of the present invention, is cooled down using leading portion, by the way of afterbody fine setting, preceding
Section cooling velocity control is in 75 DEG C/s, and oiler temperature control is at 715 DEG C.
6）Acid rolls process：Acid rolls reduction ratio 78%.
7）Continuous annealing process：Be divided into preheating section, heating one section, heating two sections, soaking zone, slow cooling section, rapid cooling section, aging section and
Cold section eventually, wherein two sections of heating and soaking zone temperature control are at 825 DEG C, slow cooling section temperature control is in 675 DEG C, rapid cooling section temperature control
System is at 391 DEG C, and aging section temperature control is at 380 DEG C.
8）Smooth process：Smooth elongation percentage point specifications control is 0.7%.
Embodiment 3
This 340MPa grades of high-strength IF steels, product thickness 1.2mm, chemical composition and weight/mass percentage composition are shown in Table 1, and mechanical property is shown in Table
2。
Production method include steel-making, continuous casting, heating of plate blank, hot rolling, section cooling, acid roll, continuous annealing, smooth process, specifically
Processing step is as follows：
1）Steel making working procedure：Tapping ladle chemistry and weight/mass percentage composition are shown in Table 1, and remaining is iron and inevitable micro member
Element.
2）Continuous casting working procedure：Using whole argon gas protective casting, using dynamic soft-reduction, liquid level fluctuation of crystallizer stability contorting
In ± 2mm.
3）Heating of plate blank process：Heating of plate blank 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 120min, three 1250 DEG C of bringing-up section temperature, 1260 DEG C of soaking zone temperature.
4）Hot-rolled process：It is divided into single chassis roughing, Coil Box and 7 frame finish rolling, wherein roughing is reciprocating rolling, extreme trace
Workpiece thickness is 42mm after secondary rolling；The finishing temperature control of 7 frame finish rolling is at 910 DEG C.
5）Section cooling process：Section cooling process of the present invention, is cooled down using leading portion, by the way of afterbody fine setting, preceding
Section cooling velocity control is in 72 DEG C/s, and oiler temperature control is at 720 DEG C.
6）Acid rolls process：Acid rolls reduction ratio 75%.
7）Continuous annealing process：Be divided into preheating section, heating one section, heating two sections, soaking zone, slow cooling section, rapid cooling section, aging section and
Cold section eventually, wherein two sections of heating and soaking zone temperature control are at 835 DEG C, slow cooling section temperature control is in 686 DEG C, rapid cooling section temperature control
System is at 410 DEG C, and aging section temperature control is at 375 DEG C.
8）Smooth process：Smooth elongation percentage point specifications control is 0.7%.
Embodiment 4
This 340MPa grades of high-strength IF steels, product thickness 1.5mm, chemical composition and weight/mass percentage composition are shown in Table 1, and mechanical property is shown in Table
2。
Production method include steel-making, continuous casting, heating of plate blank, hot rolling, section cooling, acid roll, continuous annealing, smooth process, specifically
Processing step is as follows：
1）Steel making working procedure：Tapping ladle chemistry and weight/mass percentage composition are shown in Table 1, and remaining is iron and inevitable micro member
Element.
2）Continuous casting working procedure：Using whole argon gas protective casting, using dynamic soft-reduction, liquid level fluctuation of crystallizer stability contorting
In ± 2mm.
3）Heating of plate blank process：Heating of plate blank 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 140min, three 1300 DEG C of bringing-up section temperature, 1280 DEG C of soaking zone temperature.
4）Hot-rolled process：It is divided into single chassis roughing, Coil Box and 7 frame finish rolling, wherein roughing is reciprocating rolling, extreme trace
Workpiece thickness is 42mm after secondary rolling；The finishing temperature control of 7 frame finish rolling is at 915 DEG C.
5）Section cooling process：Section cooling process of the present invention, is cooled down using leading portion, by the way of afterbody fine setting, preceding
Section cooling velocity control is in 70 DEG C/s, and oiler temperature control is at 680 DEG C.
6）Acid rolls process：Acid rolls reduction ratio 72%.
7）Continuous annealing process：Be divided into preheating section, heating one section, heating two sections, soaking zone, slow cooling section, rapid cooling section, aging section and
Cold section eventually, wherein two sections of heating and soaking zone temperature control are at 830 DEG C, slow cooling section temperature control is in 691 DEG C, rapid cooling section temperature control
System is at 385 DEG C, and aging section temperature control is at 360 DEG C.
8）Smooth process：Smooth elongation percentage point specifications control is 0.8%.
Embodiment 5
This 340MPa grades of high-strength IF steels, product thickness 2.0mm, chemical composition and weight/mass percentage composition are shown in Table 1, and mechanical property is shown in Table
2。
Production method include steel-making, continuous casting, heating of plate blank, hot rolling, section cooling, acid roll, continuous annealing, smooth process, specifically
Processing step is as follows：
1）Steel making working procedure：Tapping ladle chemistry and weight/mass percentage composition are shown in Table 1, and remaining is iron and inevitable micro member
Element.
2）Continuous casting working procedure：Using whole argon gas protective casting, using dynamic soft-reduction, liquid level fluctuation of crystallizer stability contorting
In ± 2mm.
3）Heating of plate blank process：Heating of plate blank 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 150min, three 1275 DEG C of bringing-up section temperature, 1240 DEG C of soaking zone temperature.
4）Hot-rolled process：It is divided into single chassis roughing, Coil Box and 7 frame finish rolling, wherein roughing is reciprocating rolling, extreme trace
Workpiece thickness is 45mm after secondary rolling；The finishing temperature control of 7 frame finish rolling is at 920 DEG C.
5）Section cooling process：Section cooling process of the present invention, is cooled down using leading portion, by the way of afterbody fine setting, preceding
Section cooling velocity control is in 65 DEG C/s, and oiler temperature control is at 700 DEG C.
6）Acid rolls process：Acid rolls reduction ratio 68%.
7）Continuous annealing process：Be divided into preheating section, heating one section, heating two sections, soaking zone, slow cooling section, rapid cooling section, aging section and
Cold section eventually, wherein two sections of heating and soaking zone temperature control are at 825 DEG C, slow cooling section temperature control is in 700 DEG C, rapid cooling section temperature control
System is at 420 DEG C, and aging section temperature control is at 364 DEG C.
8）Smooth process：Smooth elongation percentage point specifications control is 1.0%.
Embodiment 6
This 340MPa grades of high-strength IF steels, product thickness 2.5mm, chemical composition and weight/mass percentage composition are shown in Table 1, and mechanical property is shown in Table
2。
Production method include steel-making, continuous casting, heating of plate blank, hot rolling, section cooling, acid roll, continuous annealing, smooth process, specifically
Processing step is as follows：
1）Steel making working procedure：Tapping ladle chemistry and weight/mass percentage composition are shown in Table 1, and remaining is iron and inevitable micro member
Element.
2）Continuous casting working procedure：Using whole argon gas protective casting, using dynamic soft-reduction, liquid level fluctuation of crystallizer stability contorting
In ± 2mm.
3）Heating of plate blank process：Heating of plate blank 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 145min, three 1280 DEG C of bringing-up section temperature, 1250 DEG C of soaking zone temperature.
4）Hot-rolled process：It is divided into single chassis roughing, Coil Box and 7 frame finish rolling, wherein roughing is reciprocating rolling, extreme trace
Workpiece thickness is 45mm after secondary rolling；The finishing temperature control of 7 frame finish rolling is at 930 DEG C.
5）Section cooling process：Section cooling process of the present invention, is cooled down using leading portion, by the way of afterbody fine setting, preceding
Section cooling velocity control is in 60 DEG C/s, and oiler temperature control is at 715 DEG C.
6）Acid rolls process：Acid rolls reduction ratio 65%.
7）Continuous annealing process：Be divided into preheating section, heating one section, heating two sections, soaking zone, slow cooling section, rapid cooling section, aging section and
Cold section eventually, wherein two sections of heating and soaking zone temperature control are at 840 DEG C, slow cooling section temperature control is in 668 DEG C, rapid cooling section temperature control
System is at 407 DEG C, and aging section temperature control is at 400 DEG C.
8）Smooth process：Smooth elongation percentage point specifications control is 1.2%.
Each embodiment product of table 1 and tapping ladle chemistry and weight/mass percentage composition（%）
| Sequence number | C | Si | Mn | P | S | Als | Nb | Ti | B | N |
| Embodiment 1 | 0.0028 | 0.02 | 0.24 | 0.045 | 0.003 | 0.030 | 0.029 | 0.045 | 0.0006 | 0.0017 |
| Embodiment 2 | 0.0034 | 0.03 | 0.22 | 0.043 | 0.004 | 0.055 | 0.033 | 0.036 | 0.0008 | 0.0020 |
| Embodiment 3 | 0.0050 | 0.02 | 0.15 | 0.055 | 0.005 | 0.035 | 0.040 | 0.033 | 0.0005 | 0.0024 |
| Embodiment 4 | 0.0042 | 0.01 | 0.29 | 0.044 | 0.005 | 0.025 | 0.038 | 0.041 | 0.0010 | 0.0031 |
| Embodiment 5 | 0.0021 | 0.02 | 0.35 | 0.035 | 0.008 | 0.039 | 0.025 | 0.030 | 0.0015 | 0.0050 |
| Embodiment 6 | 0.0030 | 0.03 | 0.28 | 0.039 | 0.006 | 0.043 | 0.034 | 0.035 | 0.0012 | 0.0027 |
Each embodiment product mechanical property of table 2
| Sequence number | Product thickness/mm | Tensile strength Rm/MPa | Yield strength Rp0.2/MPa | Elongation percentage A80mm/% |
| Embodiment 1 | 0.8 | 360 | 198 | 44 |
| Embodiment 2 | 1.0 | 367 | 202 | 38 |
| Embodiment 3 | 1.2 | 375 | 206 | 42 |
| Embodiment 4 | 1.5 | 383 | 211 | 39 |
| Embodiment 5 | 2.0 | 395 | 217 | 37 |
| Embodiment 6 | 2.5 | 378 | 208 | 40 |
Above example is only used to illustrative and not limiting technical scheme, although entering with reference to above-described embodiment to the present invention
Go detailed description, it will be understood by those within the art that：Still the present invention can be modified or equally replaced
Change, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should cover will in right of the invention
Ask among scope.
Claims (9)
1. a kind of 340MPa grades of high-strength IF steel, it is characterised in that the high-strength IF steel chemical composition and weight/mass percentage composition are：C
≤ 0.0050%, Si≤0.03%, Mn：0.15~0.35%, P：0.035~0.055%, S≤0.008%, Als：0.025~
0.055%, Nb：0.025~0.040 %, Ti：0.030~0.045%, B：0.0005~0.0015%, N≤0.0050%, remaining is
Iron and inevitably trace element.
2. a kind of 340MPa grades of high-strength IF steels according to claim 1, it is characterised in that the high-strength IF steel tensile strength
>=340MPa, 180~230MPa of yield strength, elongation percentage A80 >=36%.
3. based on a kind of production method of 340MPa grades of high-strength IF steels described in claim 1 or 2, it includes steel-making, continuous casting, plate
Base heating, hot rolling, section cooling, acid are rolled, continuous annealing, smooth process, it is characterised in that the steel making working procedure, tapping molten steel chemistry
Composition and weight/mass percentage composition are：C≤0.0050%, Si≤0.03%, Mn：0.15~0.35%, P：0.035~0.055%, S≤
0.008%, Als：0.025~0.055%, Nb：0.025~0.040 %, Ti：0.030~0.045%, B：0.0005~
0.0015%, N≤0.0050%, remaining is iron and inevitably micro-.
4. the production method of a kind of 340MPa grades of high-strength IF steels according to claim 3, it is characterised in that the slab adds
Thermal technology's sequence, is divided into a bringing-up section, two bringing-up sections, three bringing-up sections and soaking zone, 120~150min of slab time inside furnace, three heating
1220~1300 DEG C of Duan Wendu, 1200~1280 DEG C of soaking zone temperature.
5. a kind of production method of 340MPa grades of high-strength IF steels according to claim 3 any one, it is characterised in that institute
Hot-rolled process is stated, is divided into single chassis roughing, Coil Box and 7 frame finish rolling, after wherein roughing is reciprocating rolling, last passes
Workpiece thickness is 40~45mm；The finishing temperature control of 7 frame finish rolling is at 900~930 DEG C.
6. a kind of production method of 340MPa grades of high-strength IF steels according to claim 3-5 any one, it is characterised in that
The section cooling process, is cooled down using leading portion, by the way of afterbody fine setting, the control of leading portion cooling velocity is in 60~80 DEG C/s, volume
Temperature control is taken at 680~720 DEG C.
7. a kind of production method of 340MPa grades of high-strength IF steels according to claim 3-5 any one, it is characterised in that
The acid rolls process, and acid rolls reduction ratio >=65%.
8. a kind of production method of 340MPa grades of high-strength IF steels according to claim 3-5 any one, it is characterised in that
The continuous annealing process, is divided into preheating section, one section of heating, two sections of heating, soaking zone, slow cooling section, rapid cooling section, aging section and end cold
Section, wherein two sections of heating and soaking zone temperature control are at 820~840 DEG C, slow cooling section temperature control is in 660~700 DEG C, rapid cooling section
Temperature control is at 380~420 DEG C, and aging section temperature control is at 360~400 DEG C.
9. a kind of production method of 340MPa grades of high-strength IF steels according to claim 3-5 any one, it is characterised in that
The smooth process, smooth elongation percentage point specifications control is 0.6~1.2%.
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| CN109161814A (en) * | 2018-08-30 | 2019-01-08 | 唐山钢铁集团有限责任公司 | A kind of ultra-low carbon baking hardening steel plate and its production method |
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Application publication date: 20170804 |