CN109252110A - Low-carbon hot-rolled pickled plate for automobile and preparation method thereof - Google Patents
Low-carbon hot-rolled pickled plate for automobile and preparation method thereof Download PDFInfo
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- CN109252110A CN109252110A CN201811311861.6A CN201811311861A CN109252110A CN 109252110 A CN109252110 A CN 109252110A CN 201811311861 A CN201811311861 A CN 201811311861A CN 109252110 A CN109252110 A CN 109252110A
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- cleaning plate
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- rolling acid
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000004140 cleaning Methods 0.000 claims abstract description 57
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 25
- 239000010959 steel Substances 0.000 claims abstract description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 13
- 238000005096 rolling process Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000009749 continuous casting Methods 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000003723 Smelting Methods 0.000 claims abstract description 4
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 4
- 239000011575 calcium Substances 0.000 claims abstract description 4
- 238000007670 refining Methods 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims abstract description 4
- 238000005098 hot rolling Methods 0.000 claims description 61
- 238000005554 pickling Methods 0.000 claims description 11
- 238000010583 slow cooling Methods 0.000 claims description 10
- 239000004615 ingredient Substances 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 3
- 239000002253 acid Substances 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 30
- 238000000034 method Methods 0.000 description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 16
- 239000011572 manganese Substances 0.000 description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 239000006104 solid solution Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 229910000655 Killed steel Inorganic materials 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 125000004433 nitrogen atom Chemical group N* 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 150000001721 carbon Chemical group 0.000 description 2
- 238000009500 colour coating Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 229910021398 atomic carbon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000009966 trimming Methods 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
-
- 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
-
- 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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- 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
The invention provides a low-carbon hot-rolled pickled plate for an automobile and a preparation method thereof, wherein the steel plate comprises the following components in percentage by weight: c: 0.03% -0.08%, Si: less than or equal to 0.05 percent, Mn: 0.1% -0.25%, P: < 0.012%, S: < 0.005%, Als: 0.050% -0.080%, N < 0.003%, Als/N is more than or equal to 20, and the balance is Fe and inevitable impurities. The preparation method comprises the steps of molten iron pretreatment → converter smelting → LF refining → calcium treatment → continuous casting → plate blank heating → rough rolling → finish rolling → coiling → uncoiling → welding → acid cleaning.
Description
Technical field
The invention belongs to a kind of low-carbon of metal material field more particularly to great surface quality for producing suitable automobile heat
Roll acid-cleaning plate and preparation method thereof.
Background technique
Hot rolling acid-cleaning plate be using hot rolled sheet as raw material, through pickling unit remove surface of steel plate oxide layer after, surface quality
Good steel sheet product, surface quality and requirement between hot rolled plate and cold-reduced sheet, it is at low cost compared to cold-reduced sheet,
Cost performance is high, is the ideal substitute products of part cold-reduced sheet.Acid-cleaning plate application field is extensive, can apply automobile, compressor,
The industries such as machine-building, spare and accessory parts processing, wherein automobile industry in the application has hot rolling acid-cleaning plate surface quality very high
It is required that.Therefore, domestic and international iron and steel enterprise improves critical process production technology and technical equipment one after another, for example, quick by application
AGC control technology, Lubrication Technology etc. have hot rolling acid-cleaning plate quality and are obviously improved, but will appear hot rolling point,
The defects of cross break prints.Especially low-carbon hot-rolling acid-cleaning plate is low with tensile strength due to surrendering, when producing thin slab product,
Point and cross breaks incidence are very high, have seriously affected the lumber recovery of acid-cleaning plate, have increased product cost.
Cross break print is low-carbon hot-rolled steel in uncoiling process, the perforation plate face that shows in strip regional area, perpendicular to
The linear streak of rolling direction.The generation of cross breaks is related with yield phenomenon existing for mild steel.Coil of strip is in uncoiler
In uncoiling, straightening process when uncoiling tension is excessive or by curved straighten during deflection it is excessive when, belt steel surface stress reach or
More than the yield strength of material, strip will be caused to generate plastic deformation, since to concentrate on it a certain for the presence of yield point elongation
Region carries out, to form rough cross breaks.
The presence of yield point elongation is as caused by the KESHI gas mass in steel.Gap solid solution atom C, the N etc. being dissolved in steel
A kind of atomic cloud for assembling formation around dislocation is exactly KESHI gas mass.When plastic deformation occurs for strip stress, KESHI gas mass
The sliding of pinning mobile dislocation, so that upper yield point occurs in strain path in strip, with the increase dislocation mobile one of stress
After section distance, so that it may get rid of the resistance of air mass and be moved under normal stress, this stress is exactly lower yield point, this mistake
Journey is formed yield point elongation.
Cross breaks are usually solved using method smooth before pickling in production.Although can by skin pass rolling
The generation of cross breaks in follow-up producing process is avoided, but can equally generate cross break print in the uncoiling process of smooth process
Defect, this defect area can only be cut off on rewinding unit, cause coil of strip lumber recovery low, increase cost.
Low-carbon disclosed in " a kind of carbon aluminium-killed steel heat zinc coating plate and its production method " (publication number CN104451377A)
Aluminum killed steel uses chemical component for C:0.015%~0.08%, Si :≤0.03%, Mn:0.1%~0.15%, P: <
0.020%, S: < 0.010%, Als:0.035%~0.060%, N≤0.002%, surplus are Fe and inevitable impurity.It should
The design of chemical component uses higher Al content and lower N content, guarantees that N is sufficiently precipitated in the form of AlN, reduces low-carbon aluminium town
Solid solution N content in quiet steel heat zinc coating plate chemically avoids carbon aluminium-killed steel heat zinc coating plate from bending after color coating in terms of ingredient
Barring.The invention simultaneously is taken respectively higher than middle part hot rolled coil head and tail portion different length according to the carbon content of different product
Coiling temperature, avoid the logical volume of hot rolled galvanized sheet to be especially the bending barring after color coating end to end from production method.But due to this
Invention to needed end to end coiling temperature strictly set by length, the high requirements on the equipment.
Hot rolling acid-cleaning plate disclosed in " a kind of hot rolling acid-cleaning plate and its production method " (publication number CN104480391A) passes through
On the basis of ordinary low-carbon steel component system, by adding micro-alloying element B, Ti, and Coil Box heat preservation, finish rolling before finish rolling are combined
Relaxation is cooling afterwards, is finally reached control tissue and precipitated phase, reduces the effect of KESHI gas mass in mild steel, make on hot-strip
Lower yield point stress difference is down to 5MPa hereinafter, eliminating hot rolled plate surface cross breaks in pickling uncoiling straightening process.But
Since the invention is added to the microalloy elements such as B, Ti, steel-making cost is higher.And B, the addition of Ti element is easy to form coarse
Precipitate, damage final properties of product.
Summary of the invention
It is provided a kind of by control low-carbon hot-rolling acid-cleaning plate it is an object of the invention to overcome the above problem and deficiency
Carbon, nitrogen element content to reduce yield point elongation rate, while cooperating with the hot rolling after optimizing, acid cleaning process, produces logical volume property
Energy stabilization, automobile low-carbon hot-rolling acid-cleaning plate of great surface quality and preparation method thereof.
Main method of the present invention is to reduce ferrite matrix by the relative amount of nitrogen and dissolved aluminum in control chemical component
Middle solid solution nitrogen atom content, while using the hot rolling technology after optimization that carbon atom is existed in the form of precipitated phase, mitigate Ke
The influence of family name's air mass is not likely to produce cross breaks so that hot rolling acid-cleaning product has lower yield point elongation rate.Match simultaneously
Hot rolling and pickling uncoiling technique after closing optimization improve product yield strength, thus under the premise of not increasing cost effectively
Eliminate low-carbon acid-cleaning plate surface cross breaks.
A kind of automobile low-carbon hot-rolling acid-cleaning plate, the ingredient of the steel plate are as follows by weight percentage: C:0.03%~
0.08%, Si :≤0.05%, Mn:0.1%~0.25%, P: < 0.012%, S: < 0.005%, Als:0.050%~
0.080%, N < 0.003%, remaining is Fe and inevitable impurity；Als/N >=20 are required simultaneously, to guarantee that N element can be complete
Holotype is at AlN.
It is as follows that present component designs reason:
Carbon: a kind of cheap, apparent solution strengthening element of effect passes through solution strengthening in low-carbon hot-rolling acid-cleaning plate
The intensity for guaranteeing ferritic structure, as carbon content raising can form a small amount of Fe3C carbide and minimal amount of pearlite group
It knits.KESHI gas mass is easily formed when the carbon atom being dissolved in steel is more, forms yield point elongation and strip is made to have higher yield point
Elongation percentage forms cross breaks in pickling uncoiling process.But the surrender and tension of strip are not can guarantee when carbon content is too low
Intensity is unable to satisfy requirement, and as carbon content < 0.02%, needs to increase process and carries out carbonization treatment, increases life
Produce cost.Therefore the present invention is by carbon content control between 0.03~0.10%.
Silicon: being a kind of cheap alloying element, can effective deoxidation, and play the role of solution strengthening, it is contemplated that low-carbon
Hot rolling acid-cleaning plate surrender and tensile strength are of less demanding, and when silicone content is high will affect rolling scale removal effect and pickled surface matter
Amount, therefore hot rolling acid-cleaning plate of the present invention controls silicone content between≤0.05.
Manganese: in the present invention, Mn is mainly used for improving band hardness of steel and toughness, and when Mn content is low, strip surrender is too low,
It is easy to form cross break print in pickling uncoiling process, product elongation percentage can be reduced again when Mn content is high, be unfavorable for product punching press
Performance, therefore the present invention controls Mn content 0.1~0.25%.
Aluminium: belong to strong deoxidant element.By the aluminium element for adding certain content, it is ensured that the oxygen content in steel is as far as possible
It is low.Extra aluminium can form AlN precipitate with the nitrogen in steel after deoxidation, reduce the N atom being dissolved in steel.Therefore, originally
Als content is controlled in 0.050~0.080wt% in invention.
Nitrogen: the KESHI gas mass that nitrogen is formed in steel can hinder dislocation movement by slip when stretching, and form yield point elongation.Therefore
N content≤0.0030% is controlled in the present invention, by reducing the solid solution nitrogen content in low-carbon hot-rolling acid-cleaning plate, is required simultaneously
Als/N >=20 are further reduced solid solution N content to guarantee that N element can form AlN completely, chemically reduce in terms of ingredient horizontal
The generation of pincher.
P and s are impurity element, are essentially more lower better, it is contemplated that cost, the present invention control the content of p and s
For P≤0.012%, S≤0.005%.
The two of technical solution of the present invention are to provide a kind of preparation method of automobile low-carbon hot-rolling acid-cleaning plate, including molten iron is pre-
→ uncoiling → welding is batched in processing → converter smelting → LF refining → Calcium treatment → continuous casting → heating of plate blank → roughing → finish rolling →
→ pickling,
Continuous blank heating temperature is 1140~1200 DEG C, and continuous casting billet carries out multi- pass rolling, workpiece thickness on milling train
For 35~45mm, finish rolling total reduction >=85%, entry temperature at finishing control at 1030~1070 DEG C, finishing temperature is 840~
880 DEG C, oiler temperature control is between 580~680 DEG C.Stacking slow cooling later, stacking slow cooling slow cooling time >=8h；After hot rolling
Strip stacking slow cooling guarantees that carbide and AlN have the time being sufficiently precipitated.Again uncoiling after when coilcooling is to 45 DEG C or less
Strip is rinsed after chlorohydric acid pickling and is dried up by aligning, final trimming oiling to final finished.
Further, temperature control is as follows during coiling technique after hot rolling:
Steel plate of the present invention mainly passes through C, Mn progress solution strengthening using low-carbon hardness of steel and reaches, therefore selected parameter λ=C
It is 0.035~0.055,0.056~0.75,0.076~0.0925 3 that+Mn/20, which divides λ as the measurement standard of the strength of materials,
Section, while thickness is divided into 1.4mm~2.5mm, 2.51mm~4.0mm and tri- sections 4.01mm~6.0mm
To guarantee that yield strength >=240MPa is further, temperature control is as follows during coiling technique after hot rolling:
Further, temperature control is as follows during coiling technique after hot rolling:
When 0.035≤λ≤0.055, finished product hot rolling acid-cleaning plate of the thickness within the scope of 1.4mm~2.5mm, coiling temperature control
It is made as 650 ± 20 DEG C；
When 0.035≤λ≤0.055, finished product hot rolling acid-cleaning plate of the thickness within the scope of 2.51mm~4.0mm, coiling temperature
Control is 630 ± 20 DEG C；
When 0.035≤λ≤0.055, finished product hot rolling acid-cleaning plate of the thickness within the scope of 4.01mm~6.0mm, coiling temperature
Control is 610 ± 20 DEG C；
When 0.056≤λ≤0.075, finished product hot rolling acid-cleaning plate of the thickness within the scope of 1.4mm~2.5mm, coiling temperature control
It is made as 660 ± 20 DEG C；
When 0.056≤λ≤0.075, finished product hot rolling acid-cleaning plate of the thickness within the scope of 2.51mm~4.0mm, coiling temperature
Control is 640 ± 20 DEG C；
When 0.056≤λ≤0.075, finished product hot rolling acid-cleaning plate of the thickness within the scope of 4.01mm~6.0mm, coiling temperature
Control is 620 ± 20 DEG C
When 0.076≤λ≤0.0925, finished product hot rolling acid-cleaning plate of the thickness within the scope of 1.4mm~2.5mm, coiling temperature
Control is 670 ± 20 DEG C；
When 0.076≤λ≤0.0925, finished product hot rolling acid-cleaning plate of the thickness within the scope of 2.51mm~4.0mm, coiling temperature
Control is 650 ± 20 DEG C；
When 0.076≤λ≤0.0925, finished product hot rolling acid-cleaning plate of the thickness within the scope of 4.01mm~6.0mm, coiling temperature
Control is 630 ± 20 DEG C；
When environment temperature >=28 DEG C, above-mentioned coiling temperature reduces by 20 DEG C.
Guarantee low-carbon hot-rolling acid-cleaning plate yield strength >=240MPa of production by this method.
Low-carbon hot-rolling acid-cleaning plate in the present invention for production great surface quality reduces N content by improving Als, guarantees N
It is sufficiently precipitated in the form of AlN, reduces the solid solution nitrogen content in low-carbon hot-rolling acid-cleaning plate.Meanwhile it is cooling by the stacking of hot rolled coil
Guarantee that C element is precipitated as far as possible with carbide form, reduces the concentration that the gap in ferritic structure is dissolved atomic carbon, nitrogen, drop
Low-yield elongation percentage, the probability that cross breaks occur when mitigating uncoiling.
Equally in hot rolling technology, because not containing the microalloy element for being difficult to dissolve after low-carbon hot-rolling acid-cleaning plate,
Using low heating temperature, on the one hand prevent grain coarsening, on the other hand can be convenient control obtain lower finishing temperature and
Coiling temperature produces the tiny hot rolling acid-cleaning plate of crystal grain, takes into account intensity and toughness, so that hot rolling acid-cleaning plate yield strength >=
240MPa, elongation percentage >=40% are not easy to form cross breaks in pickling uncoiling process under this yield strength.
The beneficial effects of the present invention are:
The present invention, by increasing Als content in right amount, reduces N atom content, makes it on the component system of ordinary low-carbon steel
Exist in the form of AlN, in conjunction with rear stacking slow cooling is rolled, reduces the yield point elongation rate of product itself；Hot rolling after optimizing simultaneously
Technique ensure that yield strength >=240MPa, eliminate the generation of cross breaks in uncoiling process.The present invention does not need to use
Smooth process eliminates product cross breaks, and equipment is simple, at low cost.
Detailed description of the invention
Fig. 1 is 2 tensile stress strain curve of the embodiment of the present invention.
Specific embodiment
Below by embodiment, the present invention is further illustrated.
The embodiment of the present invention according to the component proportion of technical solution, carry out molten iron pretreatment → converter smelting → LF refining →
→ uncoiling → welding → pickling is batched in Calcium treatment → continuous casting → heating of plate blank → roughing → finish rolling →.
Slab heating temperature is 1140~1200 DEG C, is rolled later to slab, and workpiece thickness is 35~45mm, essence
Total reduction >=85% is rolled, entry temperature at finishing control is at 1030~1070 DEG C, and finishing temperature is 840~880 DEG C, coiling temperature
It controls between 580~680 DEG C, later stacking slow cooling, stacking slow cooling slow cooling time >=8h；When coilcooling is to 45 DEG C or less
Uncoiling is aligned again afterwards.
Further coiling temperature are as follows:
Selected parameter λ=C+Mn/20 as the strength of materials measurement standard by λ point for 0.035~0.055,0.056~
0.75,0.076~0.0925 3 sections, while thickness is divided into 1.4mm~2.5mm, 2.51mm~4.0mm and 4.01mm
Tri- sections~6.0mm；
When 0.035≤λ≤0.055, finished product hot rolling acid-cleaning plate of the thickness within the scope of 1.4mm~2.5mm, coiling temperature control
It is made as 650 ± 20 DEG C；
When 0.035≤λ≤0.055, finished product hot rolling acid-cleaning plate of the thickness within the scope of 2.51mm~4.0mm, coiling temperature
Control is 630 ± 20 DEG C；
When 0.035≤λ≤0.055, finished product hot rolling acid-cleaning plate of the thickness within the scope of 4.01mm~6.0mm, coiling temperature
Control is 610 ± 20 DEG C；
When 0.056≤λ≤0.075, finished product hot rolling acid-cleaning plate of the thickness within the scope of 1.4mm~2.5mm, coiling temperature control
It is made as 660 ± 20 DEG C；
When 0.056≤λ≤0.075, finished product hot rolling acid-cleaning plate of the thickness within the scope of 2.51mm~4.0mm, coiling temperature
Control is 640 ± 20 DEG C；
When 0.056≤λ≤0.075, finished product hot rolling acid-cleaning plate of the thickness within the scope of 4.01mm~6.0mm, coiling temperature
Control is 620 ± 20 DEG C
When 0.076≤λ≤0.0925, finished product hot rolling acid-cleaning plate of the thickness within the scope of 1.4mm~2.5mm, coiling temperature
Control is 670 ± 20 DEG C；
When 0.076≤λ≤0.0925, finished product hot rolling acid-cleaning plate of the thickness within the scope of 2.51mm~4.0mm, coiling temperature
Control is 650 ± 20 DEG C；
When 0.076≤λ≤0.0925, finished product hot rolling acid-cleaning plate of the thickness within the scope of 4.01mm~6.0mm, coiling temperature
Control is 630 ± 20 DEG C；
When environment temperature >=28 DEG C, above-mentioned coiling temperature reduces by 20 DEG C.
The ingredient of steel of the embodiment of the present invention is shown in Table 1.The main technologic parameters of steel of the embodiment of the present invention are shown in Table 2.The present invention is real
The performance for applying a steel is shown in Table 3.
The ingredient (wt%) of 1 steel of the embodiment of the present invention of table
| Embodiment | C | Si | Mn | P | S | Als | N | Als/N |
| 1 | 0.030 | 0.01 | 0.18 | 0.011 | 0.005 | 0.060 | 0.0019 | 31.6 |
| 2 | 0.050 | 0.02 | 0.16 | 0.012 | 0.004 | 0.035 | 0.0017 | 20.6 |
| 3 | 0.065 | 0.04 | 0.25 | 0.011 | 0.005 | 0.040 | 0.0012 | 33.3 |
| 4 | 0.070 | 0.03 | 0.12 | 0.009 | 0.005 | 0.045 | 0.0014 | 32.1 |
| 5 | 0.08 | 0.05 | 0.1 | 0.008 | 0.003 | 0.055 | 0.0015 | 36.7 |
The main technologic parameters of 2 steel of the embodiment of the present invention of table
The performance of 3 steel of the embodiment of the present invention of table
In order to state the present invention, explanation appropriately and is being sufficiently carried out to the present invention by embodiment among the above, it is above
Embodiment is merely to illustrate the present invention, and not limitation of the present invention, those of ordinary skill in related technical field, not
In the case where being detached from the spirit and scope of the present invention, it can also make a variety of changes and modification, made any modification are equally replaced
It changes, improve, should all be included in the protection scope of the present invention, scope of patent protection of the invention should be limited by claim
It is fixed.
Claims (3)
1. a kind of automobile low-carbon hot-rolling acid-cleaning plate, which is characterized in that the ingredient of the steel plate is as follows by weight percentage: C:
0.03%~0.08%, Si :≤0.05%, Mn:0.1%~0.25%, P: < 0.012%, S: < 0.005%, Als:0.050%
~0.080%, N < 0.003%, and Als/N >=20, remaining is Fe and inevitable impurity.
2. a kind of a kind of preparation method of automobile low-carbon hot-rolling acid-cleaning plate described in claim 1, including molten iron pretreatment →
→ uncoiling → welding → pickling is batched in converter smelting → LF refining → Calcium treatment → continuous casting → heating of plate blank → roughing → finish rolling →,
It is characterized by:
Slab heating temperature is 1140~1200 DEG C, is rolled later to slab, and workpiece thickness is 35~45mm, and finish rolling is total
Reduction ratio >=85%, entry temperature at finishing control is at 1030~1070 DEG C, and finishing temperature is 840~880 DEG C, oiler temperature control
Between 580~680 DEG C, stacking slow cooling later, the stacking slow cooling time >=8h；It is opened again after when coilcooling is to 45 DEG C or less
Volume aligning.
3. a kind of preparation method of automobile low-carbon hot-rolling acid-cleaning plate according to claim 2, it is characterised in that:
Coiling temperature are as follows:
λ point as the measurement standard of the strength of materials is 0.035~0.055 by selected parameter λ=C+Mn/20,0.056~0.75,
0.076~0.0925 3 sections, at the same by thickness be divided into 1.4mm~2.5mm, 2.51mm~4.0mm and 4.01mm~
Tri- sections 6.0mm；
When 0.035≤λ≤0.055, hot rolled plate of the thickness within the scope of 1.4mm~2.5mm, oiler temperature control is 650 ± 20
℃；
When 0.035≤λ≤0.055, finished product hot rolling acid-cleaning plate of the thickness within the scope of 2.51mm~4.0mm, oiler temperature control
It is 630 ± 20 DEG C；
When 0.035≤λ≤0.055, finished product hot rolling acid-cleaning plate of the thickness within the scope of 4.01mm~6.0mm, oiler temperature control
It is 610 ± 20 DEG C；
When 0.056≤λ≤0.075, finished product hot rolling acid-cleaning plate of the thickness within the scope of 1.4mm~2.5mm, oiler temperature control is
660±20℃；
When 0.056≤λ≤0.075, finished product hot rolling acid-cleaning plate of the thickness within the scope of 2.51mm~4.0mm, oiler temperature control
It is 640 ± 20 DEG C；
When 0.056≤λ≤0.075, finished product hot rolling acid-cleaning plate of the thickness within the scope of 4.01mm~6.0mm, oiler temperature control
It is 620 ± 20 DEG C
When 0.076≤λ≤0.0925, finished product hot rolling acid-cleaning plate of the thickness within the scope of 1.4mm~2.5mm, oiler temperature control
It is 670 ± 20 DEG C；
When 0.076≤λ≤0.0925, finished product hot rolling acid-cleaning plate of the thickness within the scope of 2.51mm~4.0mm, oiler temperature control
It is 650 ± 20 DEG C；
When 0.076≤λ≤0.0925, finished product hot rolling acid-cleaning plate of the thickness within the scope of 4.01mm~6.0mm, oiler temperature control
It is 630 ± 20 DEG C；
When environment temperature >=28 DEG C, above-mentioned coiling temperature reduces by 20 DEG C.
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| CN111663078A (en) * | 2020-06-09 | 2020-09-15 | 首钢集团有限公司 | Hot-rolled pickled plate and method for eliminating pit defect of hot-rolled pickled plate |
| CN113249558A (en) * | 2021-04-15 | 2021-08-13 | 首钢集团有限公司 | Method for reducing coarse grain defects of low-carbon aluminum-killed steel and low-carbon aluminum-killed steel prepared by same |
| CN114645195A (en) * | 2020-10-31 | 2022-06-21 | 日照宝华新材料有限公司 | Hot-rolled pickled sheet band without transverse crease defect |
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|---|---|
| CN109252110B (en) | 2019-09-20 |
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