CN108588560A - The manufacturing method of continuous casting low-carbon microalloy Thin Strip Steel containing ultra-fine acicular ferrite - Google Patents
The manufacturing method of continuous casting low-carbon microalloy Thin Strip Steel containing ultra-fine acicular ferrite Download PDFInfo
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- CN108588560A CN108588560A CN201810507558.7A CN201810507558A CN108588560A CN 108588560 A CN108588560 A CN 108588560A CN 201810507558 A CN201810507558 A CN 201810507558A CN 108588560 A CN108588560 A CN 108588560A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
Abstract
The manufacturing method of continuous casting low-carbon microalloy Thin Strip Steel containing ultra-fine acicular ferrite, carries out according to the following steps：(1) smelting molten steel, ingredient are by mass percentage：C 0.02~0.08%, Si 0.05~0.3%, Mn 0.1~0.5%, S 0.002~0.01%, P 0.01~0.15%, Al 0.002~0.03%, O 0.002~0.01%, Ti 0.005~0.2%, surplus Fe, Si%:Mn%=0.5~1.5, Al%:O%=1.0~3.5；(2) molten steel is solidified and is exported by the roll gap between two crystallization rolls, and continuous casting of thin strip is made；(3) 700~750 DEG C first are cooled to the rate of 10~20 DEG C/s, then 400~450 DEG C is cooled to the rate of 35~45 DEG C/s, batched.The double roller continuous casting low-carbon microalloy Thin Strip Steel for obtaining the acicular ferrite containing width of sheet between 0.5~3 μm of the present invention, further increases the strength of materials and toughness.
Description
Technical field
The invention belongs to thin strap continuous casting low-carbon micro steel-alloy manufacturing field, a kind of continuous casting low-carbon containing ultra-fine acicular ferrite
The manufacturing method of microalloy Thin Strip Steel.
Background technology
Currently, low-carbon thin gauge strip product of the production containing microalloy element mainly passes through traditional hot rolling and Cold-roller
Skill still be there are problems that using traditional hot rolling and cold-rolling process production low-carbon microalloy Thin Strip Steel；First, production stream
Journey is long, and energy-output ratio is big, and production cost is higher；Secondly, in order to improve the intensity of low-carbon thin gauge strip product, usually in smelting
The elements such as addition Nb, V, Mo, can further increase cost in this way during refining；Also, the alloying elements such as Nb, V, Mo are hot rolled
It is precipitated in journey, armor plate strength is made to increase, rolling loads is caused to increase, increase energy consumption and equipment loss.
Strip continuous casting technology is the important front edge technology of 21 century iron and steel domain, has short route, low energy consumption, high production rate
The advantages that, technical characterstic is that metal freezing is made to be carried out at the same time with deformation, omit conventional metals production process in reheating and
Metal is directly processed into the near-net-shape products of 1~5mm thickness by the techniques such as hot rolling from liquid；After into 20th century the eighties, generation
Some iron companies in boundary, such as Nippon Steel, Thyssen Krupp, POSCO, Nucor company have all put into a large amount of resource to grind
Study carefully and develop thin band continuous casting technique, and to realize mild steel on thin strap continuous casting production line thin in May, 2002 Nucor companies
Band is commercially produced, and substituting conventionally produced Thin Specs low-carbon microalloy strip using thin band continuous casting technique has become not
Carry out the important directions of steel production technology development.
However, currently with twin-roll thin strip continuous casting technology production low-carbon microalloy Thin Strip Steel there are still some problems；It is double
The original depth of roller continuous casting strip is close to the final thickness of band, roll reduction very little in production process.It is passed through with traditional handicraft
The product for crossing heavy reduction rolling is compared, and the crystal grain of thin strap continuous casting product is coarseer, and intensity and toughness are also poor.
Patent CN201210067092.6 discloses a kind of thin strap continuous casting low-carbon microalloy high-strength steel band manufacturing method；The party
Method use chemical component weight percentage for：C0.01~0.25%, Si≤0.4%, Mn0.6~2.0%, P≤0.015%, S
≤ 0.01%, N≤0.006%, O≤0.008%, B0.0005~0.004%, including more than one Nb of Nb, V, Ti, Mo
0.005~0.1%, V 0.005~0.1%, Ti 0.005~0.1%, Mo 0.05~0.5%, remaining is Fe, to be more than 20
DEG C/s cooling rates are cooled to 1050~1250 DEG C of hot rollings, reduction ratio 20~50%, rate of deformation>Then 20s-1 is batched；Hot rolling
The microscopic structure of band is bainite and acicular ferrite；This method adds B element to obtain acicular ferrite and bainite,
Improve the cost of product, meanwhile, this method also needs to carry out hot rolling, after hot rolling only by primary cooling and coiling temperature compared with
It is high.
Patent CN201611016033.0 discloses a kind of manufacturing method containing acicular ferrite low-carbon Thin Strip Steel, the party
Method is added to Zr elements, and the non-metallic inclusion containing Zr is formed in molten steel, induces acicular ferrite nucleating, and need to carry out
Hot rolling.
Patent CN201611016620.X discloses acicular ferrite volume in a kind of raising double-roller rolling low-carbon Thin Strip Steel
The method of score；This method is added to V element, and the non-metallic inclusion containing V is formed in molten steel, induces acicular ferrite shape
Core, and need to carry out hot rolling；This two patents are required for carrying out hot-rolled process, and only once cool down, and coiling temperature is higher.
Patent CN201510399323.7 disclose a kind of double roller continuous casting low-carbon micro steel-alloy containing acicular ferrite and its
Manufacturing method, this method can only obtain the low-carbon micro steel-alloy strip that acicular ferrite content is 3~15%, and only once
Cooling, coiling temperature is higher.
Patent CN201510399358.0 discloses a kind of raising double roller continuous casting low-carbon micro steel-alloy acicular ferrite content
Method, this method is only once cooled down, and there are hot-rolled process, coiling temperature is higher.
Invention content
The above problem existing for low-carbon microalloy Thin Strip Steel technology is prepared by continuous casting for existing, the present invention provides a kind of
The manufacturing method of continuous casting low-carbon microalloy Thin Strip Steel containing ultra-fine acicular ferrite is obtained by rational ingredient and technological design
To the tissue of the acicular ferrite containing polygonal ferrite and width of sheet between 0.5~3 μm, to make product obtain more
High intensity and toughness.
The method of the present invention carries out according to the following steps：
(1) smelting molten steel, ingredient are by mass percentage：C 0.02~0.08%, Si 0.05~0.3%, Mn 0.1
~0.5%, S 0.002~0.01%, P 0.01~0.15%, sol-Al (dissolved aluminum) 0.002~0.03%, O 0.002~
0.01%, Cu<0.5%, Cr<1.0%, Ni<0.2%, Ti 0.005~0.2%, surplus Fe, and the percentage of Si and Mn
The percentage ratio that ratio is 0.5~1.5, Al and O is 1.0~3.5；
(2) molten steel in ladle is flowed into through tundish by the crystallization roll and side seal of two reverse rotations of double-roller continuous casting machine
Board group at cavity in form molten bath, the degree of superheat of the molten steel of molten bath upper surface is 10~30 DEG C, and molten steel passes through two crystallization rolls
Between roll gap solidify and export, export speed be 20~50m/min, continuous casting of thin strip is made；
(3) continuous casting of thin strip is subjected to cooling for the first time, is cooled to 700~750 DEG C with the cooling rate of 10~20 DEG C/s, so
Second of cooling is carried out afterwards, is cooled to 400~450 DEG C with the cooling rate of 35~45 DEG C/s, is finally batched, thickness 1.5 is made
~4mm continuous casting low-carbon microalloy Thin Strip Steel coiled sheets.
In the metallographic structure of above-mentioned continuous casting low-carbon microalloy Thin Strip Steel coiled sheet, the volume fraction of acicular ferrite is 30~
60%, 0.5~3 μm of the width of sheet of acicular ferrite.
The present invention technical principle be：A certain amount of Ti elements and Al elements are added in steel mainly two aspect effects：
One is deoxidation treatment, reduces the O content in steel；The second is forming effective non-metallic inclusion, acicular ferrite shape is induced
Core, thinning microstructure improve intensity and toughness；Controlling the degree of superheat of molten steel and export speed mainly has two aspect effects：One is
The initial solidification tissue for controlling low-carbon microalloy Thin Strip Steel can eliminate coarse column by controlling the degree of superheat and export speed
Crystalline substance obtains the Cast Strip of all equiax crystal；The second is controlling the size of non-metallic inclusion in molten steel, the ruler of non-metallic inclusion
The very little nucleation rate tool to acicular ferrite has a significant impact, and the size for being most suitable for acicular ferrite nucleating is 0.2~0.8 μm；If
Cooling procedure has two aspect effects to meter twice：One is the content of control acicular ferrite, the acicular ferrite of proper content can
To improve the intensity of strip in the case where ensureing compared with high-elongation；The second is the size of control acicular ferrite lath, ultra-fine
Acicular ferrite can improve the area of high-angle boundary in unit volume, to further increase the strength of materials and toughness；
The difference of cooling procedure and primary cooling procedure is twice：Primary cooling refers to that Cast Strip goes out after roller or hot rolling with constant cooling speed
Rate is cooled to coiling temperature, although this type of cooling can effectively induce acicular ferrite, can not control needle simultaneously
The volume fraction and slat dimension of columnar ferrite obtain optimal tissue；When cooling rate is relatively small, cooling rate can protect
Card obtains the acicular ferrite of enough contents, but acicular ferrite width of sheet can not be made to be refined to 0.5~3 μm；Cooling speed
When rate is larger, cooling rate can ensure that acicular ferrite width of sheet is refined to 0.5~3 μm, but Ovshinsky is largely subcooled
Body is changed into bainite, can not obtain desired tissue；Cooling twice refers to by Cast Strip from roller is gone out to the humidity province of curling process
Between with a certain specific temperature be divided into two continuous temperature ranges (such as：It is divided into 1500~800 DEG C and 800 by 1500~500 DEG C
~500 DEG C of two sections) and Cast Strip is cooled down with different cooling rates respectively in the two temperature ranges；It is cold twice
But technique can control the size of the volume fraction and acicular ferrite lath of acicular ferrite simultaneously, compensate for a bosher
The deficiency of skill obtains the low-carbon micro steel-alloy strip containing a large amount of ultra-fine acicular ferrites.
Acicular ferrite is by the nonequiaxial ferrite of non-metallic inclusion induced synthesis in crystal grain radially grown
Phase, a large amount of acicular ferrite can assemble growth, and closely occlusion forms interlocking structure to adjacent slat, can hinder the expansion of crackle
Exhibition, can effectively improve the toughness of material；Acicular ferrite lath Dislocations density is higher, to improve the intensity of material；With
The mean breadth of acicular ferrite lath is only generally unlike the low-carbon microalloy Thin Strip Steel containing acicular ferrite, in the present invention
It is 0.5~3 μm, and the acicular ferrite width of sheet in other Thin Strip Steels is usually 3.5~5 μm, tiny acicular ferrite
The area that can effectively improve high-angle boundary in acicular ferrite area unit volume can be very big when volume fraction is constant
Improvement material intensity and toughness.
Compared with prior art, the features of the present invention and advantageous effect are：In the double roller continuous casting low-carbon only once cooled down
Average-size works as coiling temperature to the acicular ferrite lath obtained in microalloy Thin Strip Steel between 3.5~5 μm under normal conditions
The average-size of acicular ferrite lath is even greater than 5 μm when excessively high or non-metallic inclusion size is larger；The present invention can obtain
To the double roller continuous casting low-carbon microalloy Thin Strip Steel of the acicular ferrite containing width of sheet between 0.5~3 μm, ultra-fine is needle-shaped
Ferrite can improve the area of high-angle boundary in unit volume, further increase the strength of materials and toughness；Using ultra-fine
The microstructure and mechanical property that acicular ferrite improves double roller continuous casting low-carbon microalloy strip is a kind of cost-effective new method.
Description of the drawings
Fig. 1 is the manufacturing method flow signal of the continuous casting low-carbon microalloy Thin Strip Steel containing ultra-fine acicular ferrite of the present invention
Figure；
In figure：1, ladle, 2, tundish, 3, double-roller continuous casting machine crystallization roll, 4, molten bath, 5, continuous casting of thin strip, 6, cooling system
A, 7, cooling system B, 8, crimping machine, 9, continuous casting low-carbon microalloy Thin Strip Steel coiled sheet；
Fig. 2 is the scanning electron microscope (SEM) photograph of the continuous casting low-carbon microalloy Thin Strip Steel of the embodiment of the present invention 1；
Fig. 3 is the transmission electron microscope picture of the continuous casting low-carbon microalloy Thin Strip Steel of the embodiment of the present invention 1；
Fig. 4 is the metallographic structure micrograph of the continuous casting low-carbon microalloy Thin Strip Steel of the embodiment of the present invention 1；
Fig. 5 is the metallographic structure micrograph of the continuous casting low-carbon microalloy Thin Strip Steel of comparative example 1 of the present invention；
Fig. 6 is the metallographic structure micrograph of the continuous casting low-carbon microalloy Thin Strip Steel of comparative example 3 of the present invention；
Fig. 7 is the metallographic structure micrograph of the continuous casting low-carbon microalloy Thin Strip Steel of comparative example 4 of the present invention；
Fig. 8 is the metallographic structure micrograph of the continuous casting low-carbon microalloy Thin Strip Steel of comparative example 5 of the present invention.
Specific implementation mode
The method flow of the present invention is as shown in Figure 1；Smelting molten steel, the molten steel in ladle 1 flow into anti-by two through tundish 2
Molten bath 4 is formed in the cavity formed to the double-roller continuous casting machine crystallization roll 3 and side seal board of rotation, molten steel is by between two crystallization rolls
Roll gap solidify and export, form continuous casting of thin strip 5, continuous casting of thin strip 5 carried out through cooling system A 6 it is cooling for the first time, then through cooling
System B 7 carries out second of cooling, is finally batched by coiling machine 8, obtains continuous casting low-carbon microalloy thin strip steel coil 9.
In the continuous casting low-carbon microalloy Thin Strip Steel obtained in the embodiment of the present invention, the volume fraction of acicular ferrite and average
Width of sheet is calculated according to the occupied area and width of sheet of acicular ferrite in metallographic structure figure.
The width 200mm of low-carbon microalloy thin strip steel coil in the embodiment of the present invention.
The equipment that use is observed in the embodiment of the present invention is respectively OLYMPUS-BX53M metallographic microscopes, Tecnai
G2F20 Flied emissions transmission electron microscope, 600 electronic scanner microscopes of FEI QUANTA.
Embodiment 1
Smelting molten steel, ingredient are by mass percentage：C 0.0,3%, Si 0.3%, Mn 0.3%, S 0.005%, P
0.12%, sol-Al 0.01%, O 0.003%, Cu 0.2%, Cr 0.4%, Ni 0.1%, Ti 0.007%, surplus are
The ratio that the ratio of Fe, Si% and Mn% are 1, Al% and O% is 3.33；
Molten steel in ladle is flowed into through tundish by the crystallization roll and side seal board of two reverse rotations of double-roller continuous casting machine
Molten bath is formed in the cavity of composition, the degree of superheat of the molten steel of molten bath upper surface is 10 DEG C, and molten steel is by between two crystallization rolls
Roll gap is solidified and is exported, and export speed is 20m/min, and continuous casting of thin strip is made；
Continuous casting of thin strip is subjected to cooling for the first time, 700 DEG C is cooled to the cooling rate of 10 DEG C/s, then carries out second
It is cooling, 400 DEG C are cooled to the cooling rate of 35 DEG C/s, is finally batched, thickness 4mm continuous casting low-carbon microalloy thin band steel sheets are made
Volume；In its metallographic structure, the volume fraction of acicular ferrite is 30%, 2.4 μm of the width of sheet of acicular ferrite, electron-microscope scanning
The results are shown in Figure 2, and the results are shown in Figure 3 for transmission electron microscopy, and microstructure morphology is as shown in Figure 4.
Embodiment 2
With embodiment 1, difference is method：
(1) molten steel composition is by mass percentage：C 0.05%, Si 0.15%, Mn 0.1%, S 0.002%, P
0.01%, sol-Al 0.03%, O 0.01%, Cu 0.3%, Cr 0.8%, Ni 0.2%, Ti 0.005%, surplus Fe,
The ratio that the ratio of Si% and Mn% is 1.5, Al% and O% is 3.0；
(2) degree of superheat of molten steel is 20 DEG C, and export speed is 30m/min；
(3) cooling for the first time to be cooled to 730 DEG C with the cooling rate of 15 DEG C/s, second of the cooling cooling speed with 40 DEG C/s
Rate is cooled to 430 DEG C, continuous casting low-carbon microalloy Thin Strip Steel coiled sheet thickness 2.5mm；In its metallographic structure, the volume of acicular ferrite
Score is 45%, 2.2 μm of the width of sheet of acicular ferrite.
Embodiment 3
With embodiment 1, difference is method：
(1) molten steel composition is by mass percentage：C 0.08%, Si 0.25%, Mn 0.5%, S 0.01%, P
0.15%, sol-Al0.002%, O 0.002%, Cu 0.5%, Cr 1.0%, Ni 0.05%, Ti 0.2%, surplus Fe,
The ratio that the ratio of Si% and Mn% is 0.5, Al% and O% is 1.0；
(2) degree of superheat of molten steel is 30 DEG C, and export speed is 50m/min；
(3) cooling for the first time to be cooled to 750 DEG C with the cooling rate of 20 DEG C/s, second of the cooling cooling speed with 45 DEG C/s
Rate is cooled to 450 DEG C, continuous casting low-carbon microalloy Thin Strip Steel coiled sheet thickness 1.5mm；In its metallographic structure, the volume of acicular ferrite
Score is 60%, 1.9 μm of the width of sheet of acicular ferrite.
Comparative example 1
The molten steel composition of use is smelted with embodiment 1 and continuous casting is the same as embodiment 1, the cooling speed with 5 DEG C/s cooling for the first time
Rate is cooled to 700 DEG C, and second of cooling cooling rate with 1 DEG C/s, which is cooled to 400 DEG C, (i.e. while reducing first time and second
Cooling cooling velocity), other steps are with embodiment 1, and in manufactured strip microscopic metallographic structure, acicular ferrite content is
5%, acicular ferrite mean breadth is about 4.1 μm, as shown in Figure 5.
Comparative example 2
The molten steel composition of use is smelted with embodiment 1 and continuous casting is the same as embodiment 1, for the first time cooling cooling with 20 DEG C/s
Rate is cooled to 700 DEG C, and second of cooling cooling rate with 60 DEG C/s is cooled to 400 DEG C and (accelerates the cold of second of cooling
But speed), other steps are with embodiment 1, in manufactured strip microscopic metallographic structure, Main Tissues be martensite, bainite and
Polygonal ferrite is practically free of acicular ferrite.
Comparative example 3
The molten steel composition of use is smelted with embodiment 1 and continuous casting is the same as embodiment 1, for the first time cooling cooling with 50 DEG C/s
Rate is cooled to 700 DEG C, and second of cooling cooling rate with 0.5 DEG C/s is cooled to 400 DEG C and (accelerates the cold of cooling for the first time
But speed reduces by second cooling cooling velocity), other steps are with embodiment 1, in manufactured strip microscopic metallographic structure,
Acicular ferrite content 10%, acicular ferrite lath mean breadth are 4.3 μm, as shown in Figure 6.
Comparative example 4
The molten steel composition of use is smelted with embodiment 1 and continuous casting is the same as embodiment 1, for the first time cooling cooling with 35 DEG C/s
Rate is cooled to 500 DEG C (accelerating cooling velocity cooling for the first time, reduce temperature after cooling), cold without second
But, other steps are with embodiment 1, in manufactured strip microscopic metallographic structure, containing a large amount of bainites, as shown in Figure 7.
Comparative example 5
The molten steel composition of use is smelted with embodiment 1 and continuous casting is the same as embodiment 1, for the first time cooling cooling with 50 DEG C/s
Rate is cooled to 500 DEG C (cooling velocity cooling for the first time is further speeded up relative to comparative example 4), cold without second
But, other steps in manufactured strip microscopic metallographic structure, are mainly made of bainite and martensite, are not almost had with embodiment 1
There is acicular ferrite, as shown in Figure 8.
Claims (2)
1. a kind of manufacturing method of the continuous casting low-carbon microalloy Thin Strip Steel containing ultra-fine acicular ferrite, it is characterised in that press following step
It is rapid to carry out：
(1) smelting molten steel, ingredient are by mass percentage：C 0.02~0.08%, Si 0.05~0.3%, Mn 0.1~
0.5%, S 0.002~0.01%, P 0.01~0.15%, sol-Al 0.002~0.03%, O 0.002~0.01%, Cu<
0.5%, Cr<1.0%, Ni<0.2%, Ti 0.005~0.2%, surplus Fe, and the percentage ratio of Si and Mn is 0.5
The percentage ratio of~1.5, Al and O are 1.0~3.5；
(2) molten steel in ladle is flowed into through tundish by the crystallization roll and side seal board group of two reverse rotations of double-roller continuous casting machine
At cavity in form molten bath, the degree of superheat of the molten steel of molten bath upper surface is 10~30 DEG C, and molten steel is by between two crystallization rolls
Roll gap solidify and export, export speed be 20~50m/min, continuous casting of thin strip is made；
(3) continuous casting of thin strip is carried out cooling for the first time, 700~750 DEG C is cooled to the cooling rate of 10~20 DEG C/s, then into
Second of cooling of row, is cooled to 400~450 DEG C with the cooling rate of 35~45 DEG C/s, finally batches, 1.5~4mm of thickness is made
Continuous casting low-carbon microalloy Thin Strip Steel coiled sheet.
2. the manufacturing method of the continuous casting low-carbon microalloy Thin Strip Steel according to claim 1 containing ultra-fine acicular ferrite,
It being characterized in that in the metallographic structure of the continuous casting low-carbon microalloy Thin Strip Steel coiled sheet, the volume fraction of acicular ferrite is 30~
60%, 0.5~3 μm of the width of sheet of acicular ferrite.
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Cited By (3)
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| CN111558701A (en) * | 2020-06-23 | 2020-08-21 | 中南大学 | Manufacturing method of fine-grain high-strength microalloy martensitic steel thin strip |
| CN111647794A (en) * | 2020-04-17 | 2020-09-11 | 江阴兴澄特种钢铁有限公司 | Steel wire rod and wire rod packing steel wire and manufacturing method thereof |
| CN113751679A (en) * | 2021-09-09 | 2021-12-07 | 中南大学 | Manufacturing method of cobalt-free maraging steel cold-rolled thin strip |
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| WO2013047078A1 (en) * | 2011-09-30 | 2013-04-04 | 日立金属株式会社 | Maraging steel |
| CN103436790A (en) * | 2013-08-29 | 2013-12-11 | 宝山钢铁股份有限公司 | Wear-resistant steel for ore slurry delivering welded pipe line and manufacturing method thereof |
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