CN106544485A - The manufacture method of CSP great surface quality medium and high carbon steel - Google Patents
The manufacture method of CSP great surface quality medium and high carbon steel Download PDFInfo
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- CN106544485A CN106544485A CN201610979698.5A CN201610979698A CN106544485A CN 106544485 A CN106544485 A CN 106544485A CN 201610979698 A CN201610979698 A CN 201610979698A CN 106544485 A CN106544485 A CN 106544485A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- Metallurgy (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of manufacture method of CSP great surface quality medium and high carbon steel, comprises the steps：1) base is smelted and is casting continuously to form, slab thickness is 50～70mm；2) continuous casting billet is heated in heating furnace, strand charging temperature is 812～1053 DEG C, tapping temperature is 1107～1182 DEG C, and strand time inside furnace is 26～41min, and in burner hearth, oxygen purity is controlled 1.1%～4.8%；High-pressure water descaling is carried out respectively before entering heating furnace, after going out heating furnace；3) carry out at least six passage finish rolling rolling, in finishing stands, first frame, the second frame rolling reduction ratio are controlled 50%～60%, carry out high-pressure water descaling between the first frame of finish rolling and the second frame, the second frame and the 3rd frame respectively, and finish rolling finishing temperature is 880～910 DEG C；4) cooling is batched and obtains finished steel coils.The CSP great surface quality medium and high carbon steel produced by the method, only 3.9～6.9 μm of its iron scale thickness, in scale structure, the volume fraction of FeO significantly reduces pickling difficulty up to 51%～72%, improves the surface quality of product.
Description
Technical field
The present invention relates to a kind of great surface quality medium and high carbon steel, particularly relates to a kind of CSP great surface quality
The manufacture method of medium and high carbon steel.
Background technology
The characteristics of medium and high carbon steel has high intensity, high rigidity and high-wearing feature, be mainly used in making all kinds of cutting tools and
Special Tool, is widely used in the fields such as papermaking, forestry, rubber, plastics, light textile, electrical equipment, light industry and machinery.
At present, the technological process of production of most medium and high carbon steel products is：Steel-making → continuous casting → heating → hot rolling → pickling →
It is cold rolling.Medium and high carbon steel carry out it is cold rolling before, need first to remove the iron scale of Surfaces of Hot Rolled Strip, then carry out next step
Deep processing, the general removing method for adopting pickling as iron scale.The efficiency of pickling by steel surface iron scale thickness and
The impact of the factors such as structure.Under the premise of the acid washing conditions identical such as concentration, temperature in acid solution, the thickness of iron scale is thinner,
FeO contents in scale structure are more more more are conducive to pickling, and the thickness of iron scale is thicker, in scale structure
Fe3O4Content is more more more is unfavorable for pickling, and pickling quality directly determines the surface quality of finished product.
The medium and high carbon steel produced using thin plate blank continuously casting and continuously rolling technology, as charging temperature is high, the heat time is short, and iron sheet is thick
Degree is relatively thin, and board briquette fluctuation is little, and iron sheet structure is more uniform, and these features advantageously reduce the follow-up pickling of medium and high carbon steel
Difficulty, is conducive to improving the surface quality of finished product.
Chinese patent ZL201210435101.2 discloses a kind of preparation method of easy pickled plate：Smelting molten steel continuous casting
Into slab；Then high-pressure water descaling is used, the slab after de-scaling is carried out into roughing, finish rolling is then carried out, it is cooled to 500 after finish rolling～
Batch when 550 DEG C, 5～10 DEG C/min of cooldown rate after batching, obtain rolled easy pickling of the content of FeO more than 25%
Steel grade, batches when 650～700 DEG C are cooled to after finish rolling, 1～5 DEG C/min of cooldown rate after batching, and obtains iron scale FeO
Content be less than 10%, the easy pickling steel grade of cold rolling state of even structure.The method can cause the more traditional work of iron scale thickness
Thinning 20%～30% under the conditions of skill so that the pickling speed of strip is improved by 150～160m/min under conventional process conditions
To 180～200m/min, steel plate acid-washing quality was both ensure that, be effectively improved pickling efficiency again.However, the method is only suitable for
In the mild steel of conventional hot continuous rolling machine producing line production, for the great surface quality medium and high carbon steel discomfort of CSP production
With.
The content of the invention
It is an object of the invention to provide a kind of mass fraction suitable for carbon is 0.30%～0.79%, product thickness being
The manufacture method of the CSP great surface quality medium and high carbon steel of 1.4mm～7.0mm.
For achieving the above object, the system of a kind of CSP great surface quality medium and high carbon steel provided by the present invention
Method is made, is connected for producing the sheet blank continuous casting that carbon mass fraction is that 0.30%～0.79%, product thickness is 1.4～7.0mm
Great surface quality medium and high carbon steel is rolled, which comprises the steps：
1) base is smelted and is casting continuously to form, slab thickness is 50～70mm；
2) continuous casting billet is heated in heating furnace, strand charging temperature is 812～1053 DEG C, and tapping temperature is 1107
～1182 DEG C, strand time inside furnace is 26～41min, and in burner hearth, oxygen purity is controlled 1.1%～4.8%；Enter heating
Stokehold, go out heating furnace after carry out high-pressure water descaling respectively；
3) at least six passage finish rolling rolling is carried out, in finishing stands, the first frame, the rolling reduction ratio control of the second frame exist
50%～60%, high-pressure water descaling, finish rolling are carried out respectively between the first frame of finish rolling and the second frame, the second frame and the 3rd frame
Finishing temperature is 880～910 DEG C；
4) cooling is batched and obtains finished steel coils.
Preferably, step 1) in, chemical composition as following weight percent is smelted：C：0.30%～0.79%,
Si：0.15%～0.40%, Mn：0.40%～1.70%, Cr：0.15%～1.10%, P：≤ 0.015%, S：≤
0.010%, N：≤ 0.008%, remaining is Fe and inevitable impurity.
Further, step 1) in, chemical composition as following weight percent is smelted：C：0.30%～
0.79%, Si：0.17%～0.40%, Mn：0.69%～1.63%, Cr：0.18%～1.10%, P：≤ 0.011%, S：≤
0.005%, N：≤ 0.007%, remaining is Fe and inevitable impurity.
Preferably, step 2) in, enter stokehold de-scaling water pressure for 34～40MPa, after coming out of the stove de-scaling water pressure be 24～
38MPa。
Preferably, step 2) in, in burner hearth, oxygen purity is controlled 3.2%～4.8%.Oxygen content controls here
In the range of can further improve the content of FeO in iron scale.
Preferably, step 3) in, between frame, the de-scaling water pressure of high-pressure water descaling is 10～15MPa.
Preferably, step 3) in, the muzzle velocity for controlling strip at the end of finish rolling is 8～18m/s, at the end of control finish rolling
Convexity≤60 μm of strip.Using the mill speed of 8～18m/s, iron scale thickness is advantageously reduced；At the end of control finish rolling
Strip profile≤60 μm be conducive to improve plate face iron scale uniformity.
Preferably, step 4) in, cooling down the concrete mode batched is：Section cooling is carried out, with the cooling of 30～50 DEG C/s
Speed water-cooled is batched to after 550～700 DEG C；It is air-cooled to 400～450 DEG C with the cooling velocity of 2～7 DEG C/min after batching,
Room temperature is air cooled to subsequently.Cool down 400～450 DEG C to be conducive to controlling iron scale using 550～700 DEG C of coiling temperatures and quickly
The content of middle FeO so as to be easily acid washed, is conducive to the surface quality of finished product.
The invention has the beneficial effects as follows：
1) thickness of strand be only 50～70mm, strand charging temperature be 812～1053 DEG C, tapping temperature be only 1107～
1182 DEG C, strand time inside furnace is 26～41min, it is only necessary to which low temperature concurrent heating in short-term can just reach target heating temperature and realize
The homogenization of temperature, therefore the iron scale of heating process generation can be greatly lowered；
2) in burner hearth, oxygen content control range is 1.1%～4.8%, can be with effective control oxidized iron sheets on surface of casting blank layer
Thickness and structure, reduce the difficulty of de-scaling；Before entering heating furnace, after going out heating furnace and first and second frame of finish rolling, second and third
High-pressure water descaling is employed between frame, multiple de-scaling is effectively guaranteed scale removal effect；Using 880～910 DEG C of end
Roll temperature to be conducive to further reducing iron scale thickness；
3) the CSP great surface quality medium and high carbon steel produced by the method, its iron scale thickness only 3.9
～6.9 μm, in scale structure, the volume fraction of FeO significantly reduces pickling difficulty, improves finished product up to 51%～72%
Surface quality.
Description of the drawings
Fig. 1 is the hot rolling microstructure shape appearance figure of the medium and high carbon steel produced by embodiment 4.
Fig. 2 is the decarburized structure shape appearance figure of the medium and high carbon steel produced by embodiment 4.
Fig. 3 is the medium and high carbon steel scale structure shape appearance figure produced by embodiment 4.
Specific embodiment
With reference to specific embodiment, the present invention is described in further detail.
The technical process of the manufacture method of CSP great surface quality medium and high carbon steel of the present invention is：Molten iron
Desulfurization → bessemerize → Argon → refining → continuous casting → soaking → seven frame finish rolling → section cooling → batch → control cooling,
Wherein, smelting process, including desulfurizing iron, bessemerize, Argon and refining for prior art, the present invention does not do expansion explanation.
The method is comprised the following steps that：
1) smelted, it is C that refining process carries out the chemical composition ranges of the molten steel after Alloying Treatment：0.30%～
0.79%, Si：0.17%～0.40%, Mn：0.69%～1.63%, Cr：0.18%～1.10%, P：≤ 0.011%, S：≤
0.005%, N：≤ 0.007%, remaining is Fe and inevitable impurity；
2) base is casting continuously to form, wherein：Thickness of strand is 50～70mm；To continuous casting billet heat, strand charging temperature be 812～
1053 DEG C, tapping temperature be 1107～1182 DEG C, strand time inside furnace be 26～41min, oxygen content control range in burner hearth
For 1.1%～4.8%；Before entering heating furnace, go out the laggard horizontal high voltage water de-scaling of heating furnace, enter stokehold de-scaling water pressure for 34～
40MPa, after coming out of the stove, de-scaling water pressure is 24～38MPa；
3) carry out seven passage finish rolling rolling, the rolling reduction ratio control of first and second frame of finish rolling 50%～60%, finish to gauge temperature
Spend for 880～910 DEG C, the 8～18m/s of muzzle velocity of the 7th frame strip of finish rolling, control strip profile at the end of finish rolling≤
60 μm, first and second frame of finish rolling carries out high-pressure water descaling, de-scaling 10～15MPa of water pressure between second and third frame；
4) section cooling is carried out, is batched to after 550～700 DEG C with the cooling velocity water-cooled of 30～50 DEG C/s, is batched
Afterwards with air-cooled to 400～450 DEG C of the cooling velocity of 2～7 DEG C/min, room temperature is then air cooled to；
The hot-rolled product thickness for finally giving be 1.4～7.0mm, 3.9～6.9 μm of iron scale thickness, iron oxide leather block
In structure, the content of FeO is 51%～72%.
According to the difference of each step design parameter, the invention provides following examples：
Embodiment 1
It is C that refining process carries out the chemical composition ranges of the molten steel after Alloying Treatment：0.30%, Si：0.17%, Mn：
0.69%, Cr：0.93%, P：0.011%, S：0.004%, N：0.005%, remaining is Fe and inevitable impurity；Continuous casting
Base thickness is 50mm；Strand is heated, strand charging temperature is 812 DEG C, and strand tapping temperature is 1107 DEG C, and strand is in stove
Time is 41min, and in burner hearth, oxygen content is controlled 3.2%；Before entering heating furnace, go out the laggard horizontal high voltage water de-scaling of heating furnace, enter
Stokehold de-scaling water pressure 40MPa, de-scaling water pressure 24MPa after coming out of the stove；Rolled, the rolling reduction ratio control of the 1st frame of finish rolling
52%, 60%, finishing temperature is 907 DEG C to the rolling reduction ratio control of the 2nd frame of finish rolling, the outlet of the 7th frame strip of finish rolling
Speed is 18m/s, and strip profile is 26 μm, and first and second frame of finish rolling carries out high-pressure water descaling, de-scaling water between second and third frame
Pressure is respectively 15MPa and 10MPa；Section cooling is carried out, is batched to after 550 DEG C with the cooling velocity water-cooled of 50 DEG C/s,
With air-cooled to 450 DEG C of the cooling velocity of 7 DEG C/min after batching, room temperature is then air cooled to.
Embodiment 2
It is C that refining process carries out the chemical composition ranges of the molten steel after Alloying Treatment：0.41%, Si：0.40%, Mn：
0.89%, Cr：1.10%, P：0.008%, S：0.003%, N：0.007%, remaining is Fe and inevitable impurity；Continuous casting
Base thickness is 53mm；Strand is heated, strand charging temperature is 916 DEG C, and strand tapping temperature is 1143 DEG C, and strand is in stove
Time is 39min, and in burner hearth, oxygen content is controlled 2.5%；Before entering heating furnace, go out the laggard horizontal high voltage water de-scaling of heating furnace, enter
Stokehold de-scaling water pressure 35MPa, de-scaling water pressure 38MPa after coming out of the stove；Rolled, the rolling reduction ratio control of the 1st frame of finish rolling
60%, 52%, finishing temperature is 910 DEG C to the rolling reduction ratio control of the 2nd frame of finish rolling, the outlet of the 7th frame strip of finish rolling
Speed is 15m/s, and strip profile is 34 μm, and first and second frame of finish rolling carries out high-pressure water descaling, de-scaling water between second and third frame
Pressure is respectively 13MPa and 12MPa；Section cooling is carried out, is batched to after 591 DEG C with the cooling velocity water-cooled of 46 DEG C/s,
With air-cooled to 432 DEG C of the cooling velocity of 5 DEG C/min after batching, room temperature is then air cooled to.
Embodiment 3
It is C that refining process carries out the chemical composition ranges of the molten steel after Alloying Treatment：0.54%, Si：0.29%, Mn：
1.63%, Cr：0.18%, P：0.007%, S：0.005%, N：0.006%, remaining is Fe and inevitable impurity；Continuous casting
Base thickness is 59mm；Strand is heated, strand charging temperature is 871 DEG C, and strand tapping temperature is 1129 DEG C, and strand is in stove
Time is 34min, and in burner hearth, oxygen content is controlled 4.8%；Before entering heating furnace, go out the laggard horizontal high voltage water de-scaling of heating furnace, enter
Stokehold de-scaling water pressure 39MPa, de-scaling water pressure 31MPa after coming out of the stove；Rolled, the rolling reduction ratio control of the 1st frame of finish rolling
50%, 57%, finishing temperature is 880 DEG C to the rolling reduction ratio control of the 2nd frame of finish rolling, the outlet of the 7th frame strip of finish rolling
Speed is 11m/s, and strip profile is 43 μm, and first and second frame of finish rolling carries out high-pressure water descaling, de-scaling water between second and third frame
Pressure is respectively 13MPa and 15MPa；Section cooling is carried out, is batched to after 632 DEG C with the cooling velocity water-cooled of 41 DEG C/s,
With air-cooled to 400 DEG C of the cooling velocity of 6 DEG C/min after batching, room temperature is then air cooled to.
Embodiment 4
It is C that refining process carries out the chemical composition ranges of the molten steel after Alloying Treatment：0.66%, Si：0.23%, Mn：
1.05%, P：0.007%, S：0.005%, N：0.006%, remaining is Fe and inevitable impurity；Thickness of strand is
66mm；Strand is heated, strand charging temperature is 1053 DEG C, strand tapping temperature is 1182 DEG C, strand time inside furnace is
26min, in burner hearth, oxygen content is controlled 4.1%；Before entering heating furnace, go out the laggard horizontal high voltage water de-scaling of heating furnace, enter stokehold and remove
Squama water pressure 34MPa, de-scaling water pressure 29MPa after coming out of the stove；Rolled, the 1st frame of finish rolling rolling reduction ratio is controlled 56%,
50%, finishing temperature is 895 DEG C to the rolling reduction ratio control of the 2nd frame of finish rolling, and the muzzle velocity of the 7th frame strip of finish rolling is
10m/s, strip profile are 55 μm, first and second frame of finish rolling, and high-pressure water descaling, de-scaling water pressure point are carried out between second and third frame
Wei not 10MPa and 12MPa；Section cooling is carried out, is batched to after 687 DEG C with the cooling velocity water-cooled of 30 DEG C/s, after batching
With air-cooled to 421 DEG C of the cooling velocity of 2 DEG C/min, room temperature is then air cooled to.
Embodiment 5
It is C that refining process carries out the chemical composition ranges of the molten steel after Alloying Treatment：0.79%, Si：0.33%, Mn：
0.71%, P：0.009%, S：0.003%, N：0.007%, remaining is Fe and inevitable impurity；Thickness of strand is
70mm；Strand is heated, strand charging temperature is 1005 DEG C, strand tapping temperature is 1168 DEG C, strand time inside furnace is
29min, in burner hearth, oxygen content is controlled 1.1%；Before entering heating furnace, go out the laggard horizontal high voltage water de-scaling of heating furnace, enter stokehold and remove
Squama water pressure 37MPa, de-scaling water pressure 37MPa after coming out of the stove；Rolled, the 1st frame of finish rolling rolling reduction ratio is controlled 57%,
56%, finishing temperature is 889 DEG C to the rolling reduction ratio control of the 2nd frame of finish rolling, and the muzzle velocity of the 7th frame strip of finish rolling is
8m/s, strip profile are 60 μm, first and second frame of finish rolling, and high-pressure water descaling, de-scaling water pressure point are carried out between second and third frame
Wei not 11MPa and 14MPa；Section cooling is carried out, is batched to after 700 DEG C with the cooling velocity water-cooled of 37 DEG C/s, after batching
With air-cooled to 441 DEG C of the cooling velocity of 3 DEG C/min, room temperature is then air cooled to.
The examination and test of products
Every mechanical property and iron scale of each embodiment hot rolling medium and high carbon steel product are detected, under testing result
Shown in table 1.
1 each embodiment product mechanical property of table and iron scale detection table
The pattern of the hot rolling medium and high carbon steel product produced to embodiment 4 is tested, and Fig. 1 is hot rolling microstructure pattern, by
Figure is visible, and lamellar pearlite+net carbide is organized as after rolling.Fig. 2 is decarburized structure pattern, as seen from the figure, one side decarburized layer
Average thickness is 14 μm, and one side decarburization stratum proportion is 0.61%.Fig. 3 is scale structure pattern, as seen from the figure, iron scale
Structure is mainly by FeO and Fe3O4Composition, iron scale thickness range are 4.2～5.1 μm, the content of FeO in scale structure
About 68%.
Claims (8)
1. a kind of manufacture method of CSP great surface quality medium and high carbon steel, for producing carbon mass fraction be
0.30%～0.79%, product thickness is the CSP great surface quality medium and high carbon steel of 1.4～7.0mm, its feature
It is：The method comprises the steps：
1) base is smelted and is casting continuously to form, slab thickness is 50～70mm；
2) continuous casting billet is heated in heating furnace, strand charging temperature be 812～1053 DEG C, tapping temperature be 1107～
1182 DEG C, strand time inside furnace is 26～41min, and in burner hearth, oxygen purity is controlled 1.1%～4.8%；Enter heating furnace
Before, go out heating furnace after carry out high-pressure water descaling respectively；
3) at least six passage finish rolling rolling is carried out, in finishing stands, the first frame, the second frame rolling reduction ratio are controlled 50%
～60%, carry out high-pressure water descaling, finish rolling finish to gauge between the first frame of finish rolling and the second frame, the second frame and the 3rd frame respectively
Temperature is 880～910 DEG C；
4) cooling is batched and obtains finished steel coils.
2. the manufacture method of CSP great surface quality medium and high carbon steel according to claim 1, its feature exist
In：Step 1) in, chemical composition as following weight percent is smelted：C：0.30%～0.79%, Si：0.15%～
0.40%, Mn：0.40%～1.70%, Cr：0.15%～1.10%, P：≤ 0.015%, S：≤ 0.010%, N：≤
0.008%, remaining is Fe and inevitable impurity.
3. the manufacture method of CSP great surface quality medium and high carbon steel according to claim 2, its feature exist
In：Step 1) in, chemical composition as following weight percent is smelted：C：0.30%～0.79%, Si：0.17%～
0.40%, Mn：0.69%～1.63%, Cr：0.18%～1.10%, P：≤ 0.011%, S：≤ 0.005%, N：≤
0.007%, remaining is Fe and inevitable impurity.
4. the manufacturer of the CSP great surface quality medium and high carbon steel according to any one of claims 1 to 3
Method, it is characterised in that：Step 2) in, enter stokehold de-scaling water pressure for 34～40MPa, after coming out of the stove de-scaling water pressure be 24～
38MPa。
5. the manufacturer of the CSP great surface quality medium and high carbon steel according to any one of claims 1 to 3
Method, it is characterised in that：Step 2) in, in burner hearth, oxygen purity is controlled 3.2%～4.8%.
6. the manufacturer of the CSP great surface quality medium and high carbon steel according to any one of claims 1 to 3
Method, it is characterised in that：Step 3) in, between frame, the de-scaling water pressure of high-pressure water descaling is 10～15MPa.
7. the manufacturer of the CSP great surface quality medium and high carbon steel according to any one of claims 1 to 3
Method, it is characterised in that：Step 3) in, the muzzle velocity for controlling strip at the end of finish rolling is 8～18m/s, at the end of control finish rolling
Convexity≤60 μm of strip.
8. the manufacturer of the CSP great surface quality medium and high carbon steel according to any one of claims 1 to 3
Method, it is characterised in that：Step 4) in, cooling down the concrete mode batched is：Section cooling is carried out, with the cooling speed of 30～50 DEG C/s
Degree water-cooled is batched to after 550～700 DEG C；With air-cooled to 400～450 DEG C of the cooling velocity of 2～7 DEG C/min after batching, with
After be air cooled to room temperature.
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| CN109628715A (en) * | 2018-12-28 | 2019-04-16 | 首钢集团有限公司 | Cooling method for improving quality of steel coil |
| CN110317995A (en) * | 2019-06-03 | 2019-10-11 | 武汉钢铁有限公司 | A method of with carbon hot rolled steel plate in the CSP production good thin gauge of surface quality |
| CN112760554A (en) * | 2019-10-21 | 2021-05-07 | 宝山钢铁股份有限公司 | High-strength steel with excellent ductility and manufacturing method thereof |
| CN113877963A (en) * | 2021-09-28 | 2022-01-04 | 日照钢铁控股集团有限公司 | Control method for pressing in iron scale on surface of hot-rolled silicon-controlled strip steel |
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| CN116219274A (en) * | 2022-12-05 | 2023-06-06 | 天津市新天钢联合特钢有限公司 | Steel for building engineering aluminum template pull tab and production method |
| CN117733093A (en) * | 2023-12-08 | 2024-03-22 | 湖南华菱涟源钢铁有限公司 | Control method for surface cracks of medium-high carbon steel |
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