CN107245656A - The fin steel and its CSP production technologies of a kind of excellent surface quality - Google Patents
The fin steel and its CSP production technologies of a kind of excellent surface quality Download PDFInfo
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- CN107245656A CN107245656A CN201710455371.2A CN201710455371A CN107245656A CN 107245656 A CN107245656 A CN 107245656A CN 201710455371 A CN201710455371 A CN 201710455371A CN 107245656 A CN107245656 A CN 107245656A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 50
- 239000010959 steel Substances 0.000 title claims abstract description 50
- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 238000005516 engineering process Methods 0.000 title claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000005096 rolling process Methods 0.000 claims abstract description 22
- 229910052742 iron Inorganic materials 0.000 claims abstract description 18
- 238000002791 soaking Methods 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 241000277275 Oncorhynchus mykiss Species 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000498 cooling water Substances 0.000 claims abstract description 8
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 7
- 230000003647 oxidation Effects 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 238000003723 Smelting Methods 0.000 claims abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 3
- 239000000446 fuel Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 21
- 238000000034 method Methods 0.000 abstract description 15
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000007812 deficiency Effects 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 11
- 238000005098 hot rolling Methods 0.000 description 11
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 239000002131 composite material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 235000013372 meat Nutrition 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000005554 pickling Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 230000009931 harmful effect Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- -1 oxonium ion Chemical class 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
- 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
-
- 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
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
A kind of fin steel of excellent surface quality, its component and wt% are：C：No more than 0.01%, Mn：0.18~0.30%, Si：0~0.02%, Als：No more than 0.005%, P：0~0.03%, S：0~0.01%, N：0.002~0.007%.Its technique：Converter smelting；LF stoves are refined；Strand enters soaking pit soaking；Using high-pressure water descaling；Before the rolling of each frame, first start gap cooling water, it is rear to carry out finish rolling using seven frame units；Section cooling；Batch.It is on the high side that the present invention solves fin steel oxidation iron sheet defect, and strip steel head and afterbody hit coiling clamp roller in the case where losing a state and produce the deficiency of roll marks defect, and the advantage of abbreviated system is given full play to, the coil of strip entire volume thickness and precision produced is fluctuated in 30 μm, entire volume length direction strength fluctuation within 20Mpa.
Description
Technical field
The present invention relates to a kind of ultra-low-carbon steel and its CSP production technologies, a kind of fin of excellent surface quality is particularly belonged to
Steel and its CSP manufacturing technique methods.
Background technology
Fin steel is the raw material of finned heat exchanger.Finned heat exchanger is changed as one kind of heat-exchange device by it
Hot cell is similar to fin and gained the name, and is mainly used in air in drying system and heats, is the capital equipment in hot air apparatus.Thermal medium
It can be steam or hot water, it is also possible to conduction oil, because, around piece, radiating fin and radiating tube contact surface are big and tight using machinery, pass
Well, stably, air is small by preventing for hot property, and heat exchange efficiency is high.For the demand of energy-conserving and environment-protective, fin output of steel in recent years
Steady-state growth at home.Fin steel belongs to ultra-low-carbon steel, subsequently to carry out pickling, slitting and composite rolling, its special use
Way and manufacturing process, Surface Quality, plate shape, thickness and precision etc. require harsh.Surface is not allow for iron scale, greasy dirt, roller
The defects such as print, the problems such as otherwise easily producing bubble, peeling in follow-up clad-rolling process has a strong impact on composite rolling effect
Really.
Before making the present invention, fin steel is produced mainly using traditional hot rolling producing line production using heavy slab.Using
Traditional heavy slab and conventional hot rolling producing line are produced, and its deficiency existed is：（1）Product thickness precision is low：After fin steel
Continuous technological process is pickling, slitting, composite rolling, and transverse direction and longitudinal direction thickness difference is no more than 30 μm, institute after customer requirement slitting
To require very high to hot rolling stock roll thickness and precision, it is desirable to which convexity is no more than 50 μm, and wedge shape is no more than 20 μm, and longitudinal thickness is poor
It must control within 30 μm, conventional hot rolling producing line is difficult to fully meet；（2）Properties of product lack of homogeneity：Will during composite rolling
Long rolling load fluctuation of demanding perfection is small, it is desirable to which hot rolling stock roll total length strength fluctuation is within 30MPa, and conventional hot rolling producing line is because rising
The reason for speed rolling, cause strip end to end and middle portion temperature has certain deviation, therefore total length performance inconsistency is larger；（3）In the presence of
Edge upwarping defect：During conventional hot rolling producing line production, there is edge upwarping defect within edge 15-30mm, on the one hand
Lumber recovery is relatively low, on the other hand also results in more quality objection and complains and compensate；（4）Production cycle is long：Connect and order from contract
Coil of strip is delivered, and typically needs time of 1 month, hands over phase more urgent contract for customer requirement, it is difficult to which punctual delivery meets visitor
Family is required.
CSP production lines are the sheet billet continuous casting and rolling production lines of a new generation, and it has, and flow is short, pulling rate is fast, steel-making steel rolling
It is rigidly connected, the features such as constant speed rolling temperature homogeneity is good.Produced under this process conditions, product thickness precision is high, performance ripple
Dynamic small, plate shape is excellent, while entering stove to the hot rolled coil time of offline only several hours, particular case lower delivery cycle from molten iron
It is short, can preferably it meet customer need.To give full play to CSP producing line advantage, preferably meet customer need,
Fin steel is transplanted to the production of CSP producing lines.But during using CSP technique productions fin steel, there is following deficiency：（1）Iron scale
Defect：The mode of heating and rolling mill practice of CSP producing line soaking pits are different from conventional hot rolling producing line, while dephosphorization equipment ability is again not
And conventional hot rolling producing line, scale defect control is always the weak link of continuous casting and rolling technique of sheet bar.On the one hand influence
Fin steel coil pickled surface quality；On the other hand, many defect frames are formed on CSP surface quality detection instrument, influence is mingled with,
Checking and recognizing for the other defects such as greasy dirt, is easily caused defect and fails to judge, and produces respective quality objection.（2）Coiling clamp roller roll marks
Defect：Because fin steel steel is partially soft, strip steel head is easily hit to coiler pinch-roll formation, caused in high-speed wind-up
Fractionlet that strip steel head is peeled off etc. sticks to plus send roller surface, in follow-up coiling process, is pressed into belt steel surface, forms roller
Print defect.Iron scale and coiling clamp roller roll marks defect problem seriously constrain opening for the such high value added product of CSP producing lines
Hair and propulsion.
Through retrieval, seldom there are above-mentioned surface quality problems, especially coiling clamp roller roll marks in current routine hot rolling producing line
Defect.And similar CSP producing lines do not have the knowhow of similar fin steel, the solution that not may be referred to and use for reference.
The content of the invention
It is an object of the invention to overcome the shortcomings of that prior art is present, solution fin steel oxidation iron sheet defect is on the high side, with
And strip steel head and afterbody hit coiling clamp roller in the case where losing a state and produce the deficiency of roll marks defect, and give full play to short stream
The advantage of journey technique is there is provided plate shape is excellent, thickness and precision fluctuation 30 μm, performance uniformity it is good, entire volume length direction intensity wave
Move the fin steel and its CSP manufacturing technique methods of the excellent surface quality for meeting downstream Customer Quality requirement within 20Mpa.
Realize the measure of above-mentioned purpose：
A kind of fin steel of excellent surface quality, its component and weight percent content are：C：No more than 0.01%, Mn：0.18~
0.30%, Si：0~0.02%, Als：No more than 0.005%, P：0~0.03%, S：0~0.01%, N：0.002~0.007%, remaining
For Fe and inevitable impurity.
Preferably：C weight percent content is： 0.003~0.01%.
Preferably：Mn weight percent content is：0.20~0.30%.
Preferably：N weight percent content is：0.003~0.007%.
A kind of CSP production technologies of the fin steel of excellent surface quality, its step：
1）Converter smelting is carried out, and controls P≤0.0015% in endpoint molten steel；
2）Refined in LF stoves, and carry out RH application of vacuum, be cast into base in CSP conticasters afterwards, control the slab thickness to be
70mm；
3）Strand enters soaking pit and carries out soaking, and control strand tapping temperature is at 1110~1140 DEG C；Time inside furnace is no more than
35min；
Soaking pit takes " two-part " heating, i.e.,：1 ~ 5 section is bringing-up section, and its programming rate is controlled in 15 ~ 25 DEG C/min
Each section of air-fuel ratio is 1.2 ~ 1.3 in this stage；6 ~ 10 sections are soaking zone, control in this stage each section of air-fuel ratio 1.3 ~ 1.4；
4）Using high-pressure water descaling to casting billet surface non-oxidation iron sheet, and control de-scaling water inlet pressure to be not less than 200bar, go out
Mouth pressure is not less than 240bar；
5）Before the rolling of each frame, first start gap cooling water；And finish rolling is carried out using seven frame units, control its finish to gauge temperature
Degree is at 880 ~ 920 DEG C；Strip steel head plate speed is controlled within 8.0m/s；
F1-F4 frame roll gap cooling water sequential is adjusted, is that 12, F2 setting values are that 17, F3 setting values are 21.5, F4 by F1 setting values
Setting value is 26；
6）Section cooling is carried out, therebetween, leading portion opens the mode that a valve closes a valve using the interval type of cooling；And in steel band
Length direction takes two low, the high coiling temperature pattern of remainder, i.e. take the lead and each 10m length of tail in, be cooled to
Coiling temperature at 570 ~ 590 DEG C, the coiling temperature of remainder cooling is at 610 ~ 630 DEG C.
7）Batched.
The mechanism and effect of each element and main technique in the present invention：
C：In the present invention, the purpose designed from Ultra-low carbon is in order to obtain ferritic structure as much as possible, to reduce steel
Fe in tissue3C phases, the excellent ferritic structure of plasticity and toughness is conducive to follow-up composite rolling.Meanwhile, C content control is existed
Less than 0.01%, the solid solution C content in ferrite is reduced as far as possible, ferritic structure is obtained the purification of profound level, after being conducive to
The continuous metal composite good with ductility is rolled.
Mn：Increase the relative quantity of steel medium pearlite, and tissue is attenuated, improve intensity.In this steel grade, Mn is suitably reduced
Content, it is ensured that suitable intensity.Meanwhile, appropriate Mn can eliminate S adverse effect, from this point of view, and Mn is beneficial
Element, but content it is low when, effect is not notable.It is general to require Mn/S >=20 ~ 25, precipitations of the S in crystallization in crystal boundary is controlled, so that
Reduce hot-short sensitiveness of the steel billet in hot rolling.Accordingly, control Mn contents are 0.18 ~ 0.30%.
Si：Increase steel intensity, reduce steel ductility, be unfavorable for the follow-up cold deformation performance of strip, thus it is more low more
It is good.Si contents are controlled in the present invention 0~0.02%.
P：Phosphorus is residual elements in steel, and maximum harm is that segregation is serious, increases temper brittleness, significantly reduces the modeling of steel
Property and toughness, cause steel easy embrittlement in cold working, namely so-called " cold short " phenomenon.Phosphorus also has harmful effect to weldability,
Should strictly it control, control P content is 0~0.03% in the present invention.
S：Sulphur segregation in steel is serious, deteriorates the quality of steel.At high temperature, the plasticity of steel is reduced, is a kind of harmful element,
It is easily caused the hot-short phenomenon of steel.Therefore sulphur should be controlled strictly, control S contents are 0~0.01% in the present invention.
Als：In the present invention, Als contents exist with O and balanced, according to the actual control situation of field trash, are controlled in the present invention
Als contents are no more than 0.005%.
Why the present invention controls 1 ~ 5 section of soaking pit to be weak oxide atmosphere, and each section of air-fuel ratio is in 1.2 ~ 1.3, soaking pit 6
~ 10 sections are strong oxidizing property atmosphere, and each section of air-fuel ratio of control is 1.3 ~ 1.4.It is, due to the steel alloy content seldom, in stove
Interior Mn, Si etc. are smaller to the structure and thickness effect of iron scale.So soaking pit leading portion uses weak oxide atmosphere, in bringing-up section
Produce imperfect combustion product, CO and H2Concentration increase, suppress H2O and CO2Oxidation to slab, while avoiding depositing in furnace gas
In free oxonium ion, in iron scale of the billet surface formation based on FeO, and iron scale thickness is suitably reduced.In back segment
Using strong oxidizing property atmosphere, make the O in furnace gas2, CO2And H2O carries out Strong oxdiative to FeO, and FeO is converted into Fe2O3Based on
Structure more loose iron scale, is easy to follow-up de-scaling process to be easily removed.
Why the present invention uses leading portion interval cooling means（One valve is opened, and a valve is closed）, partly in order to suppressing
Thickness increase of the iron sheet in layer-cold roller way；On the other hand it is to cause thermal stress uneven in order to avoid continuously cold by force, is changed with reaching
The purpose of kind plate shape.When back segment is cooled down, more three times thicker iron scales can be formed in section cooling leading portion high temperature, and leading portion
Cooling advantageously reduces the thickness of iron scale.
Why the present invention opens F1-F4 frame roll gap cooling waters in advance, is to reduce strip steel head temperature, Jin Erzeng
Plus strip steel head intensity, to reduce the probability of happening that meat is glued during head impact coiling clamp roller.
Why the present invention uses ladder refrigerating mode in laminar flow（Namely two temperature of steel band is low, remainder temperature
High pattern）, control in steel coil head and afterbody 10m length, chilling temperature is at 570 ~ 590 DEG C, and remainder temperature exists
610-630 DEG C, be, in order to improve strip steel head and afterbody intensity, to lose and hit under a state to reduce super low carbon soft steel head and afterbody
Hit coiling clamp roller and cause viscous meat, reduction roll marks defect is changed the original sentence to.
The present invention is compared with prior art：
First, the Proper Match of the invention by shortening time inside furnace, low-temperature heat, furnace atmosphere optimization, and the type of cooling,
Obtain the strip that surface iron sheet is easy to pickling.
Second, the present invention is controlled by limiting strip steel head plate speed and head and tail temperature, super low carbon soft steel head is solved
Portion and afterbody lose hits pinch roll under a state, and is easy to produce viscous meat, the problem of causing roll marks defect.
Third, the present invention plays the advantage of CSP abbreviated system, make full use of constant speed rolling temperature equal
The characteristics of even property is good, makes thickness and precision high, and performance uniformity is good, i.e. fluctuation is no more than 30 μm, entire volume length direction strength fluctuation
Within 20Mpa, excellent surface quality, and it has good heat conduction, forming property, can be widely applied to finned heat exchanger
Field.
Fourth, present invention process, production process control is stable, CSP producing line quality control on the surface is overcome
The big inferior position of difficulty, solves the big technical bottleneck that restriction CSP producing lines produce super low carbon soft steel.
Embodiment
With reference to embodiment, the present invention is described in further detail, is easy to more clearly understand the present invention, but it
Not to the present invention constitute limit.
Table 1 is various embodiments of the present invention and comparative example chemical composition comparative example；
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example；
Table 3 is various embodiments of the present invention and comparative example thickness and precision, mechanics properties testing situation.
Various embodiments of the present invention are according to following technique productions：
1）Converter smelting is carried out, and controls P≤0.0015% in endpoint molten steel；
2）Refined in LF stoves, and carry out RH application of vacuum, be cast into base in CSP conticasters afterwards, control the slab thickness to be
70mm；
3）Strand enters soaking pit and carries out soaking, and control strand tapping temperature is at 1110~1140 DEG C；Time inside furnace is no more than
35min；
Soaking pit takes " two-part " heating, i.e.,：1 ~ 5 section is bringing-up section, and its programming rate is controlled in 15 ~ 25 DEG C/min
Each section of air-fuel ratio is 1.2 ~ 1.3 in this stage；6 ~ 10 sections are soaking zone, control in this stage each section of air-fuel ratio 1.3 ~ 1.4；
4）Using high-pressure water descaling to casting billet surface non-oxidation iron sheet, and control de-scaling water inlet pressure to be not less than 200bar, go out
Mouth pressure is not less than 240bar；
5）Before the rolling of each frame, first start gap cooling water；And finish rolling is carried out using seven frame units, control its finish to gauge temperature
Degree is at 880 ~ 920 DEG C；Strip steel head plate speed is controlled within 8.0m/s；
F1-F4 frame roll gap cooling water sequential is adjusted, is that 12, F2 setting values are that 17, F3 setting values are 21.5, F4 by F1 setting values
Setting value is 26；
6）Section cooling is carried out, therebetween, leading portion opens the mode that a valve closes a valve using the interval type of cooling；And in steel band
Length direction takes two low, the high coiling temperature pattern of remainder, i.e. take the lead and each 10m length of tail in, be cooled to
Coiling temperature at 570 ~ 590 DEG C, the coiling temperature of remainder cooling is at 610-630 DEG C.
7）Batched.
Table 1 is the chemical composition and its weight of Ultra-low carbon fin steel in invention embodiment 1~10 and comparative example
Percentage, surplus is Fe and inevitable impurity.
The various embodiments of the present invention of table 1 and comparative example chemical composition comparative example（wt%）
The various embodiments of the present invention of table 2 and comparative example main technologic parameters list
The various embodiments of the present invention of table 3 and comparative example thickness and precision, mechanics properties testing situation
As seen from Table 3, the coil of strip total length thickness fluctuation of each embodiment is within 30 μm, coil of strip total length strength fluctuation 20Mpa with
It is interior, and non-oxidation iron sheet, coiling clamp roller roll marks defect change the original sentence to plate shape and excellent surface quality.And comparative example 1 is because of iron oxide
Skin defect is changed the original sentence to, and comparative example 2 is changed the original sentence to because of coiling clamp roller roll marks defect.
Above-described embodiment is only most preferably to enumerate, and is not the restriction to embodiments of the present invention.
Claims (5)
1. a kind of fin steel of excellent surface quality, its component and weight percent content are：C：No more than 0.01%, Mn：0.18
~0.30%, Si：0~0.02%, Als：No more than 0.005%, P：0~0.03%, S：0~0.01%, N：0.002~0.007%, its
Remaining is Fe and inevitable impurity.
2. a kind of fin steel of excellent surface quality as claimed in claim 1, it is characterised in that：C weight percent content
For： 0.003~0.01%.
3. a kind of fin steel of excellent surface quality as claimed in claim 1, it is characterised in that：Mn weight percent content
For：0.20~0.30%.
4. a kind of fin steel of excellent surface quality as claimed in claim 1, it is characterised in that：N weight percent content
For：0.003~0.007%.
5. a kind of CSP production technologies of the fin steel of excellent surface quality as claimed in claim 1, its step：
1）Converter smelting is carried out, and controls P≤0.0015% in endpoint molten steel；
2）Refined in LF stoves, and carry out RH application of vacuum, be cast into base in CSP conticasters afterwards, control the slab thickness to be
70mm；
3）Strand enters soaking pit and carries out soaking, and control strand tapping temperature is at 1110~1140 DEG C；Time inside furnace is no more than
35min；
Soaking pit takes " two-part " heating, i.e.,：1 ~ 5 section is bringing-up section, and its programming rate is controlled in 15 ~ 25 DEG C/min
Each section of air-fuel ratio is 1.2 ~ 1.3 in this stage；6 ~ 10 sections are soaking zone, control in this stage each section of air-fuel ratio 1.3 ~ 1.4；
4）Using high-pressure water descaling to casting billet surface non-oxidation iron sheet, and control de-scaling water inlet pressure to be not less than 200bar, go out
Mouth pressure is not less than 240bar；
5）Before the rolling of each frame, first start gap cooling water；And finish rolling is carried out using seven frame units, control its finish to gauge temperature
Degree is at 880 ~ 920 DEG C；Strip steel head plate speed is controlled within 8.0m/s；
F1-F4 frame roll gap cooling water sequential is adjusted, is that 12, F2 setting values are that 17, F3 setting values are 21.5, F4 by F1 setting values
Setting value is 26；
6）Section cooling is carried out, therebetween, leading portion opens the mode that a valve closes a valve using the interval type of cooling；And in steel band
Length direction takes two low, the high coiling temperature pattern of remainder, i.e. take the lead and each 10m length of tail in, be cooled to
Coiling temperature at 570 ~ 590 DEG C, the coiling temperature of remainder cooling is at 610 ~ 630 DEG C；
7）Batched.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710455371.2A CN107245656B (en) | 2017-06-16 | 2017-06-16 | A kind of the fin steel and its CSP production technology of excellent surface quality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710455371.2A CN107245656B (en) | 2017-06-16 | 2017-06-16 | A kind of the fin steel and its CSP production technology of excellent surface quality |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107245656A true CN107245656A (en) | 2017-10-13 |
| CN107245656B CN107245656B (en) | 2019-01-25 |
Family
ID=60018244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710455371.2A Active CN107245656B (en) | 2017-06-16 | 2017-06-16 | A kind of the fin steel and its CSP production technology of excellent surface quality |
Country Status (1)
| Country | Link |
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| CN (1) | CN107245656B (en) |
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| CN109226258A (en) * | 2018-09-05 | 2019-01-18 | 湖南华菱涟源钢铁有限公司 | Method for preventing medium-high carbon hot-rolled strip steel from generating roll marks |
| CN110899329A (en) * | 2019-10-25 | 2020-03-24 | 邯郸钢铁集团有限责任公司 | Method for producing brake pad back steel based on CSP continuous casting and rolling production line |
| CN110976516A (en) * | 2019-12-30 | 2020-04-10 | 唐山市德龙钢铁有限公司 | Rolling method for eliminating roll marks on surface of hot-rolled strip steel |
| CN113118783A (en) * | 2020-05-31 | 2021-07-16 | 日照宝华新材料有限公司 | Method for controlling low-carbon steel transverse folding defect with specification of 1.5-4 mm |
| CN113680818A (en) * | 2021-06-22 | 2021-11-23 | 武汉钢铁有限公司 | CSP flow-based SAE1006 thin material manufacturing method |
| CN115382913A (en) * | 2022-09-21 | 2022-11-25 | 福建鼎盛钢铁有限公司 | Method for producing hot-rolled strip steel with thickness of 0.8mm based on full endless thin slab continuous casting and rolling |
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| CN110899329B (en) * | 2019-10-25 | 2021-08-20 | 邯郸钢铁集团有限责任公司 | Method for producing brake pad back steel based on CSP continuous casting and rolling production line |
| CN110976516A (en) * | 2019-12-30 | 2020-04-10 | 唐山市德龙钢铁有限公司 | Rolling method for eliminating roll marks on surface of hot-rolled strip steel |
| CN110976516B (en) * | 2019-12-30 | 2021-07-02 | 唐山市德龙钢铁有限公司 | Rolling method for eliminating roll marks on surface of hot-rolled strip steel |
| CN113118783A (en) * | 2020-05-31 | 2021-07-16 | 日照宝华新材料有限公司 | Method for controlling low-carbon steel transverse folding defect with specification of 1.5-4 mm |
| CN113680818A (en) * | 2021-06-22 | 2021-11-23 | 武汉钢铁有限公司 | CSP flow-based SAE1006 thin material manufacturing method |
| CN115382913A (en) * | 2022-09-21 | 2022-11-25 | 福建鼎盛钢铁有限公司 | Method for producing hot-rolled strip steel with thickness of 0.8mm based on full endless thin slab continuous casting and rolling |
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