CN106987771B - A kind of extremely low yield strength steel plate and its production method - Google Patents
A kind of extremely low yield strength steel plate and its production method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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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
- 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
- C21D8/0273—Final recrystallisation annealing
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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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- 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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- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a kind of extremely low yield strength steel plate and its production methods, belong to ultra low carbon steel slab production technical field.The extremely low yield strength steel plate, the chemical quality percentage of the steel plate are：C≤0.0050%, Si≤0.03%, Mn：0.10~0.20%, P≤0.013%, S≤0.012%, Als：0.020~0.050%, Ti：0.055~0.070%, N≤0.0050%, surplus are Fe and inevitable impurity.The production method includes smelting procedure, continuous casting working procedure, hot-rolled process and annealing operation.The crystallite dimension of steel plate of the present invention reaches 8~10 grades, yield strength≤110MPa, tensile strength >=280MPa, elongation after fracture A80 >=55%.This method production cost is low, simple for process, product shaping performance is good, can bring considerable economic benefit.
Description
Technical field
The invention belongs to ultra low carbon steel slab production technical fields, and in particular to a kind of extremely low yield strength steel plate and its production
Method.
Background technology
It is well known that cold rolling carbon constructional steel plate is important one of structural timber, it is mainly used for vapour after forming
Among turner industry, building structure, pressure vessel, bridge structure and machine-building.The factor for influencing engineering structure safety is mainly wrapped
Two aspects are included, is on the one hand structure design, is on the other hand material property.Engineering structure by shake, hit or other
When unexpected operating mode, if structure design bonding strength is unable to load metamorphism, the collaboration bearing capacity of the strength of materials is just needed.It carries
The most effectual way of high structure design bearing strength is exactly to increase structural member size, however this can increase cost.Therefore increase material
The performance of material becomes the maximum development trend of current engineering structural material, this just proposes more its intensity, plasticity
High requirement.
Currently, cold rolled automobile with steel in the market, client gradually shapes multistep to ensure that forming property is cost-effective
Technique simplifies, and makes every effort to one step forming.Yield tensile ratio is to weigh the key index of metal material moulding, Plastic Deformation of Metal Materials
When, yield tensile ratio is lower, and material is bigger to the required deformation energy of fracture from plastic deformation is started, to the energy of its compatible deformation
Power is stronger.Therefore more stringent requirements are proposed to yield tensile ratio by client, with the quality improvement and the market demand of steel, low yield strength ratio
As one of the important technology index of some engineering material.
In order to ensure lower yield tensile ratio, various improvement have been done to the chemical composition and production technology of steel in production,
Main path usually has two aspects：On the one hand it is to improve carbon content, but carbon equivalent can be made to increase in this way, influences welding performance；
On the other hand it is to improve finishing temperature or coiling temperature, this can be such that crystallite dimension increases, but can reduce tensile strength simultaneously.
Therefore, optimize ingredient and production technology, produce under the premise of proof strength and welding performance, the product tool of extremely low yield tensile ratio
There is practical and important meaning.
Japan be first research and develop low yield strength steel country, domestic R & D Enterprises mainly have Baosteel, Shoudu Iron and Steel Co, Anshan iron and steel plant,
Wuhan Iron and Steel Plant etc., specific patent are as follows：The patents such as Publication No. " JP55104429A " and " JP2004339548 ", it is disclosed to be all
Yield strength is relatively low, the higher low-alloy structural steel of elongation percentage.Be added to based in composition design by C-Si-Mn Cr, Mo,
One or more of alloys such as Ni, Cu, B, yield strength range is in 180-260MPa.Publication No. " JP05214442A "
Patents such as " JP06235042A ", disclosed low yield point steel plate yield strength is in 130MPa or less.For composition design,
All using addition microalloy element design on the basis of low C-Si-Mn, while the ingredients such as B, Nb are also added into, with regard to production technology
For, it is more complex.
The patent of Publication No. " CN104233061 " disclose a kind of yield strength 225MPa low surrender steel and its system
Method is made, which uses the composition design of C-Si-Mn, the addition without other alloying elements.The invention is by composition design and work
Skill control preferably combines, the low surrender steel plate of production economy type.But this kind of method is susceptible to mixed crystal, rolling temperature
The problems such as window narrows, and its yield tensile ratio is 60%, it is higher.
The patent of Publication No. " CN101845589 " and " JP10324918A ", disclose a kind of extremely low yield point steel plate
And its manufacturing method, yield strength is in 140MPa or so.Invention is added on the basis of low C-Si-Mn in N, Ti, Nb
One or more, and contain B element.However the addition of B not only increases the manufacturing cost of steel plate, increases smelting difficulty,
And it is unfavorable for welding and the impact property of steel plate.
The patent of Publication No. " 101514426A " discloses a kind of yield strength 100MPa grades of low surrender steel and its system
Method is made, which uses the composition design of C-Si-Mn, addition trace Ti element alloyed.There is the present invention to compare, patent
The carbon equivalent of 101514426A " is higher, and welding performance is poor.
Invention content
A kind of extremely low yield strength steel plate of present invention offer and its production method, the extremely low yield strength steel plate of the steel plate have
Excellent comprehensive mechanical property, the method for the present invention production cost is low, simple for process, product shaping performance is good, can bring considerable
Economic benefit.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：A kind of extremely low yield strength steel plate, feature
It is, the chemical quality percentage of the steel plate is：C≤0.0050%, Si≤0.03%, Mn：0.10~0.20%, P≤
0.013%, S≤0.012%, Als：0.020~0.050%, Ti：0.055~0.070%, N≤0.0050%, surplus are Fe and can not
Avoid impurity.
The cold rolling coil microscopic structure of steel plate of the present invention is single isometric ferrite, and crystallite dimension is 8~10 grades.
Steel plate yield strength≤110MPa of the present invention；Tensile strength >=280MPa；Elongation after fracture A80 >=55%.
1.5~12mm of thickness of finished steel plate of the present invention.
The steel plate Design of Chemical Composition thinking of the present invention is as follows：
C can be such that yield strength increases by solution strengthening, elongation percentage reduces, and excessive C can influence welding performance, control
Make its content≤0.005%.
Si is deoxidant element and solution strengthening element, so that yield strength is increased, elongation percentage reduction, controls its content and exist
0.02% or less.
Mn is intensified element common in steel, improves yield strength by solution strengthening, elongation percentage is made to reduce, control it and contain
Amount is in 0.1-0.2%.
P, S can improve intensity, and steel plate is made to become fragile, influence toughness, and controlling its content as impurity element exists
0.012% or less.
Al is element necessary to deoxidation, but can also improve the intensity of steel, controls its content in 0.01-0.05%.
The solid solution of N can significantly improve the intensity of steel, control its content below 0.005%.
Ti is strong ferrite former and strong deoxidier, makes nitride or carbon that more Ti is generated in steel
Compound.The presence of the carbon, nitride of the Ti can prevent the length of austenite grain in the rolling in later stage and heat treatment process
Greatly, so as to improve the intensity of steel and impact flexibility.And the presence of the nitride or carbide of Ti can also be by preventing hot shadow
The crystal grain for ringing area is grown up, and then effectively improves welding performance.Control its content 0.055-0.070%.
Another object of the present invention is to provide a kind of above-mentioned production method of extremely low yield strength steel plate, the producers
Method includes smelting procedure, continuous casting working procedure, hot-rolled process and annealing operation.
Smelting procedure of the present invention uses converter smelting, and by top and bottom complex blowing, abundant decarburization is taken off using LF refining
Oxygen desulfurized alloy, being refined using RH reduces pernicious gas N, H content, finally upper sheet billet continuous casting.
Hot-rolled process of the present invention, 5 passage of roughing rolling pass, 40~48mm of workpiece thickness；Finish rolling rolling pass 7
Passage, percentage pass reduction >=10%, total reduction >=75%.
Hot-rolled process of the present invention, the continuous rolling in perfect recrystallization temperature range roll preceding continuous blank heating temperature
1230~1270 DEG C, 120~160min of time in stove, 1130~1150 DEG C of tapping temperature；Finish rolling inlet temperature 1030~1070
DEG C, 885~915 DEG C of finishing temperature, 705~735 DEG C of coiling temperature.
Hot-rolled process of the present invention, the cold process of coiling temperature layer open U-shaped and batch pattern, and strip is higher by 30 meters end to end
20 DEG C of coiling temperature；Leading portion rapid cooling is used after rolling, 10~20 DEG C/s of cooling rate, upper and lower water is than control 1:1.
Annealing operation of the present invention, using bell type annealing furnace, hot spot/cold-point temperature is 680 ± 20 DEG C/620 ± 20 DEG C,
Elongation control 1.0%.
It is using advantageous effect caused by above-mentioned technical proposal：1, extremely low yield strength steel plate tool provided by the invention
There is an excellent comprehensive mechanical property, the crystallite dimension of steel plate reaches 8~10 grades, yield strength≤110MPa, tensile strength >=
280MPa, elongation after fracture A80 >=55% have excellent plastic deformation ability；2, extremely low yield strength steel provided by the invention
There is plate good welding performance, low-carbon-equivalent composition design ensure that steel plate has good welding performance；3, of the invention
Method is raw using controlled rolling and controlled cooling rolling mill practice and bell-type annealing technique with the basis of low C+Mn, single plus microalloy Ti elements
Production. art simply puts into small, is suitable for the production of enterprise large-scale low-cost.
Description of the drawings
200 times of micro- metallographic structure figures of edge of 1 steel band of Fig. 1 embodiments；
200 times of micro- metallographic structure figures of center portion of 1 steel band of Fig. 2 embodiments；
200 times of micro- metallographic structure figures of edge of 2 steel band of Fig. 3 embodiments；
200 times of micro- metallographic structure figures of center portion of 2 steel band of Fig. 4 embodiments；
200 times of micro- metallographic structure figures of edge of 3 steel band of Fig. 5 embodiments；
200 times of micro- metallographic structure figures of center portion of 3 steel band of Fig. 6 embodiments；
200 times of micro- metallographic structure figures of edge of 4 steel band of Fig. 7 embodiments；
200 times of micro- metallographic structure figures of center portion of 4 steel band of Fig. 8 embodiments.
Specific implementation mode
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
Embodiment 1
A kind of extremely low yield strength steel plate, thickness 3mm, chemical composition composition are shown in Table 1, and surplus is Fe and inevitable impurity
Element.
Above-mentioned extremely low yield strength steel plate producing process includes：Smelting procedure, continuous casting working procedure, hot-rolled process and lehr attendant
Sequence.Detailed process is as follows：
1）Smelting and continuous casting working procedure：
By predetermined ingredient smelting molten steel, smelting procedure uses converter smelting, and by top and bottom complex blowing, abundant decarburization uses LF
Refining carries out deoxidization desulfuration alloying, and being refined using RH reduces pernicious gas N, H content, finally upper sheet billet continuous casting.Continuous casting obtains
210mm thickness specification continuous casting billets.
2）Hot-rolled process：
Continuous casting billet after cooling is heated, 1250 DEG C, the 120min of time in stove of soaking temperature, 1150 DEG C of tapping temperature；
5 passage of roughing rolling pass, workpiece thickness 40mm；
7 passage of finish rolling rolling pass, percentage pass reduction 10%, total reduction 92%；
1070 DEG C of finish rolling inlet temperature, 900 DEG C of finishing temperature；730 DEG C of coiling temperature, the cold process of coiling temperature layer open U
Shape batches pattern, and strip is higher by 20 DEG C of coiling temperature at 30 meters end to end；
Leading portion rapid cooling is used after rolling, 10 DEG C/s of cooling rate, upper and lower water is than control 1：1.
3）Annealing operation：
690/630 DEG C of hot spot/cold-point temperature, withdrawal straightening machine elongation control 1.0%.
It obtains mechanical property of steel plate and is shown in Table 2.The cold rolling coil microscopic structure of steel plate is isometric ferrite, and crystallite dimension is 8 grades.
Embodiment 2
A kind of extremely low yield strength steel plate, thickness 9mm, chemical composition composition are shown in Table 1, and surplus is Fe and inevitable impurity
Element.
Above-mentioned extremely low yield strength steel plate producing process includes：Smelting procedure, continuous casting working procedure, hot-rolled process and lehr attendant
Sequence.Detailed process is as follows：
1）Smelting and continuous casting working procedure：
By predetermined ingredient smelting molten steel, smelting procedure uses converter smelting, and by top and bottom complex blowing, abundant decarburization uses LF
Refining carries out deoxidization desulfuration alloying, and being refined using RH reduces pernicious gas N, H content, finally upper sheet billet continuous casting.Continuous casting obtains
210mm thickness specification continuous casting billets.
2）Hot-rolled process：
Continuous casting billet after cooling is heated, 1250 DEG C, the 140min of time in stove of soaking temperature, 1140 DEG C of tapping temperature.
5 passage of roughing rolling pass, workpiece thickness 46mm；
7 passage of finish rolling rolling pass, percentage pass reduction 12%, total reduction 80%；
Controlled rolling and controlled cooling rolling process：1040 DEG C of finish rolling inlet temperature, 885 DEG C of finishing temperature；705 DEG C of coiling temperature, is batched
The cold process of temperature layer opens U-shaped and batches pattern, and strip is higher by 20 DEG C of coiling temperature at 30 meters end to end.
Leading portion rapid cooling is used after rolling, 12 DEG C/s of cooling rate, upper and lower water is than control 1：1.
3）Annealing operation：
In cover annealing process, 670/610 DEG C of hot spot/cold-point temperature, withdrawal straightening machine elongation control 0.7%.
It obtains mechanical property of steel plate and is shown in Table 2.The cold rolling coil microscopic structure of steel plate is isometric ferrite, and crystallite dimension is 9 grades.
Embodiment 3
A kind of extremely low yield strength steel plate, thickness 1.5mm, chemical composition composition are shown in Table 1, and surplus is Fe and inevitable miscellaneous
Prime element.
Above-mentioned extremely low yield strength steel plate producing process includes：Smelting procedure, continuous casting working procedure, hot-rolled process and lehr attendant
Sequence.Detailed process is as follows：
1）Smelting and continuous casting working procedure：
By predetermined ingredient smelting molten steel, smelting procedure uses converter smelting, and by top and bottom complex blowing, abundant decarburization uses LF
Refining carries out deoxidization desulfuration alloying, and being refined using RH reduces pernicious gas N, H content, finally upper sheet billet continuous casting.Continuous casting obtains
210mm thickness specification continuous casting billets.
2）Hot-rolled process：
Continuous casting billet after cooling is heated, 1270 DEG C, the 120min of time in stove of soaking temperature, 1150 DEG C of tapping temperature；
5 passage of roughing rolling pass, workpiece thickness 40mm；
7 passage of finish rolling rolling pass, rolling pass reduction rate 11%, total reduction 96%；
1070 DEG C of finish rolling inlet temperature, 890 DEG C of finishing temperature；735 DEG C of coiling temperature, the cold process of coiling temperature layer open U
Shape batches pattern, and strip is higher by 20 DEG C of coiling temperature at 30 meters end to end.
Leading portion rapid cooling is used after rolling, 20 DEG C/s of cooling rate, upper and lower water is than control 1：1.
3）Annealing operation：
In cover annealing process, 660/600 DEG C of hot spot/cold-point temperature, withdrawal straightening machine elongation control 0.6%.
It obtains mechanical property of steel plate and is shown in Table 2.The cold rolling coil microscopic structure of steel plate is isometric ferrite, and crystallite dimension is 8 grades.
Embodiment 4
A kind of extremely low yield strength steel plate, thickness 12mm, chemical composition composition are shown in Table 1, and surplus is Fe and inevitable miscellaneous
Prime element.
Above-mentioned extremely low yield strength steel plate producing process includes：Smelting procedure, continuous casting working procedure, hot-rolled process and lehr attendant
Sequence.Detailed process is as follows：
1）Smelting and continuous casting working procedure：
By predetermined ingredient smelting molten steel, smelting procedure uses converter smelting, and by top and bottom complex blowing, abundant decarburization uses LF
Refining carries out deoxidization desulfuration alloying, and being refined using RH reduces pernicious gas N, H content, finally upper sheet billet continuous casting.Continuous casting obtains
210mm thickness specification continuous casting billets.
2）Hot-rolled process：
Continuous casting billet after cooling is heated, 1230 DEG C, the 160min of time in stove of soaking temperature, 1130 DEG C of tapping temperature；
5 passage of roughing rolling pass, workpiece thickness 48mm；
7 passage of finish rolling rolling pass, percentage pass reduction 10%, total reduction 75%；
Controlled rolling and controlled cooling rolling process：1030 DEG C of finish rolling inlet temperature, 915 DEG C of finishing temperature；705 DEG C of coiling temperature, is batched
The cold process of temperature layer opens U-shaped and batches pattern, and strip is higher by 20 DEG C of coiling temperature at 30 meters end to end.
Leading portion rapid cooling is used after rolling, 10 DEG C/s of cooling rate, upper and lower water is than control 1:1.
3）Annealing operation：
In cover annealing process, 700/640 DEG C of hot spot/cold-point temperature, withdrawal straightening machine elongation control 1.0%.
It obtains mechanical property of steel plate and is shown in Table 2.The cold rolling coil microscopic structure of steel plate is isometric ferrite, crystallite dimension 10
Grade.
The chemical composition of 1 embodiment 1-4 steel of table（wt%）
| Serial number | C | Si | Mn | P | S | Als | Ti | N |
| Embodiment 1 | 0.004 | 0.015 | 0.16 | 0.010 | 0.010 | 0.036 | 0.060 | 0.002 |
| Embodiment 2 | 0.003 | 0.020 | 0.13 | 0.009 | 0.010 | 0.033 | 0.058 | 0.003 |
| Embodiment 3 | 0.005 | 0.030 | 0.10 | 0.008 | 0.012 | 0.050 | 0.070 | 0.005 |
| Embodiment 4 | 0.0045 | 0.025 | 0.20 | 0.013 | 0.008 | 0.020 | 0.055 | 0.004 |
The comprehensive mechanical property of 2 embodiment 1-4 steel plates of table
| Serial number | Position | Yield strength/MPa | Tensile strength/MPa | Yield tensile ratio | Elongation percentage A80/% |
| Embodiment 1 | 1/4 | 106 | 298 | 0.36 | 58 |
| Embodiment 2 | 1/4 | 100 | 286 | 0.35 | 61 |
| Embodiment 3 | 1/4 | 108 | 303 | 0.36 | 59 |
| Embodiment 4 | 1/4 | 110 | 280 | 0.39 | 55 |
As can be seen from the above table, extremely low yield strength steel plate provided by the invention has stable yield strength, in difference
Rolling mill practice under, the yield strengths of various thickness steel plates≤110MPa.Extremely low yield strength steel plate provided by the invention is also
With very high elongation percentage and good toughness.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although with reference to above-described embodiment to this hair
It is bright to be described in detail, it will be understood by those of ordinary skill in the art that：Still can the present invention be modified or be waited
With replacing, without departing from the spirit or scope of the invention, or any substitutions, the power in the present invention should all be covered
In sharp claimed range.
Claims (4)
1. a kind of production method of extremely low yield strength steel plate, which is characterized in that the chemical quality percentage of the steel plate is：C
≤ 0.0050%, Si≤0.03%, Mn：0.10~0.20%, P≤0.013%, S≤0.012%, Als：0.020~0.050%, Ti：
0.055~0.070%, N≤0.0050%, surplus are Fe and inevitable impurity, and cold rolling coil microscopic structure is isometric ferrite, brilliant
Particle size is 8~10 grades；Steel plate yield strength≤the 110MPa；Tensile strength >=280MPa；Elongation after fracture A80 >=55%,
The thickness of the steel plate is 1.5~12mm, and the production method includes smelting procedure, continuous casting working procedure, hot-rolled process and lehr attendant
Sequence；The smelting procedure uses converter smelting, and by top and bottom complex blowing, abundant decarburization carries out deoxidization desulfuration alloy using LF refining
Change, being refined using RH reduces pernicious gas N, H content, finally upper sheet billet continuous casting；The hot-rolled process, roughing rolling pass 5
It is secondary, 40~48mm of workpiece thickness；7 passage of finish rolling rolling pass, percentage pass reduction >=10%, total reduction >=75%；The heat
Process is rolled, the continuous rolling in perfect recrystallization temperature range, 1230~1270 DEG C of continuous blank heating temperature before rolling, the time in stove
120~160min, 1130~1150 DEG C of tapping temperature；1030~1070 DEG C of finish rolling inlet temperature, finishing temperature 885~915
DEG C, 705~735 DEG C of coiling temperature；The annealing operation, using bell type annealing furnace, hot spot/cold-point temperature is 680 ± 20 DEG C/
620 ± 20 DEG C, elongation control 0.6-1.0%.
2. the production method of extremely low yield strength steel plate according to claim 1, which is characterized in that the hot-rolled process,
The cold process of coiling temperature layer opens U-shaped and batches pattern, and strip is higher by 20 DEG C of coiling temperature at 30 meters end to end；It is fast using leading portion after rolling
Cold, 10~20 DEG C/s of cooling rate, upper and lower water is than control 1：1.
3. the production method of extremely low yield strength steel plate according to claim 1, which is characterized in that the chemistry of the steel plate
Mass percent is：C：0.003%, Si：0.020%, Mn：0.13%, P：0.009%, S：0.010%, Als：0.033%, Ti：
0.058%, N：0.003%, surplus is Fe and inevitable impurity, thickness 9mm；Production method includes：Smelting procedure, continuous casting work
Sequence, hot-rolled process and annealing operation, detailed process are as follows：
1）Smelting and continuous casting working procedure：By predetermined ingredient smelting molten steel, smelting procedure is filled using converter smelting by top and bottom complex blowing
Divide decarburization, deoxidization desulfuration alloying is carried out using LF refining, being refined using RH reduces pernicious gas N, H content, finally upper slab
Continuous casting；Continuous casting obtains 210mm thickness specification continuous casting billets；
2）Hot-rolled process：Continuous casting billet after cooling is heated, 1250 DEG C, the 140min of time in stove of soaking temperature, tapping temperature
1140℃；5 passage of roughing rolling pass, workpiece thickness 46mm；7 passage of finish rolling rolling pass, percentage pass reduction 12%, stagnation pressure
Lower rate 80%；
Controlled rolling and controlled cooling rolling process：1040 DEG C of finish rolling inlet temperature, 885 DEG C of finishing temperature；705 DEG C of coiling temperature, coiling temperature
The cold process of layer opens U-shaped and batches pattern, and strip is higher by 20 DEG C of coiling temperature at 30 meters end to end；Leading portion rapid cooling, cooling rate are used after rolling
12 DEG C/s, upper and lower water is than control 1：1；
3）Annealing operation：In cover annealing process, 670/610 DEG C of hot spot/cold-point temperature, withdrawal straightening machine elongation control 0.7%；Surrender is strong
Degree：100MPa, tensile strength：286MPa, yield tensile ratio：0.35, elongation percentage A80/%：61；The cold rolling coil microscopic structure of steel plate be etc.
Axis ferrite, crystallite dimension are 9 grades.
4. the production method of extremely low yield strength steel plate according to claim 1, which is characterized in that the chemistry of the steel plate
Mass percent is：C：0.005%, Si：0.030%, Mn：0.10%, P：0.008%, S：0.012%, Als：0.050%, Ti：
0.070%, N：0.005%, surplus is Fe and inevitable impurity, thickness 1.5mm；Production method includes：Smelting procedure, continuous casting work
Sequence, hot-rolled process and annealing operation, detailed process are as follows：
1）Smelting and continuous casting working procedure：By predetermined ingredient smelting molten steel, smelting procedure is filled using converter smelting by top and bottom complex blowing
Divide decarburization, deoxidization desulfuration alloying is carried out using LF refining, being refined using RH reduces pernicious gas N, H content, finally upper slab
Continuous casting；Continuous casting obtains 210mm thickness specification continuous casting billets；
2）Hot-rolled process：Continuous casting billet after cooling is heated, 1270 DEG C, the 120min of time in stove of soaking temperature, tapping temperature
1150℃；5 passage of roughing rolling pass, workpiece thickness 40mm；7 passage of finish rolling rolling pass, percentage pass reduction 11%, stagnation pressure
Lower rate 96%；
Controlled rolling and controlled cooling rolling process：1070 DEG C of finish rolling inlet temperature, 890 DEG C of finishing temperature；735 DEG C of coiling temperature, coiling temperature
The cold process of layer opens U-shaped and batches pattern, and strip is higher by 20 DEG C of coiling temperature at 30 meters end to end；Leading portion rapid cooling, cooling rate are used after rolling
20 DEG C/s, upper and lower water is than control 1：1；
3）Annealing operation：In cover annealing process, 660/600 DEG C of hot spot/cold-point temperature, withdrawal straightening machine elongation control 0.6%；Surrender is strong
Degree：108MPa, tensile strength：303MPa, yield tensile ratio：0.36, elongation percentage A80/%：59；The cold rolling coil microscopic structure of steel plate be etc.
Axis ferrite, crystallite dimension are 8 grades.
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| CN108998742B (en) * | 2018-08-08 | 2020-08-18 | 南京钢铁股份有限公司 | Steel plate with extremely low yield strength and manufacturing method thereof |
| CN110218946B (en) * | 2019-07-17 | 2021-10-01 | 新余钢铁股份有限公司 | Ultra-low carbon steel coiled plate for ultra-thin shell of oil filter and manufacturing method thereof |
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| CN110373613B (en) * | 2019-08-05 | 2021-05-07 | 钢铁研究总院 | Low-yield-point steel for 100 MPa-level anti-seismic damper and preparation method thereof |
| CN112063818A (en) * | 2020-09-22 | 2020-12-11 | 攀钢集团研究院有限公司 | Low-temperature coiled cold-rolled steel plate with high formability and production method thereof |
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| CN113714288B (en) * | 2021-08-19 | 2023-06-30 | 安钢集团冷轧有限责任公司 | Production method of hot-rolled strip steel for low-cost low-yield-strength DC01 cold-rolled sheet |
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