CN106498293B - A kind of preparation method of hot forming high-carbon hot continuous rolling pickling steel band - Google Patents
A kind of preparation method of hot forming high-carbon hot continuous rolling pickling steel band Download PDFInfo
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- 238000005096 rolling process Methods 0.000 title claims abstract description 70
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 69
- 239000010959 steel Substances 0.000 title claims abstract description 69
- 238000005554 pickling Methods 0.000 title claims abstract description 61
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 18
- 238000005098 hot rolling Methods 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 10
- 238000003723 Smelting Methods 0.000 claims abstract description 8
- 238000007670 refining Methods 0.000 claims description 18
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 9
- 238000009966 trimming Methods 0.000 claims description 9
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 8
- 239000008186 active pharmaceutical agent Substances 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 229910052791 calcium Inorganic materials 0.000 claims description 8
- 239000011575 calcium Substances 0.000 claims description 8
- 238000006477 desulfuration reaction Methods 0.000 claims description 8
- 230000023556 desulfurization Effects 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 8
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 8
- 238000009749 continuous casting Methods 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 238000005275 alloying Methods 0.000 abstract description 6
- 229910052719 titanium Inorganic materials 0.000 abstract description 5
- 229910052796 boron Inorganic materials 0.000 abstract description 4
- 229910052758 niobium Inorganic materials 0.000 abstract description 4
- 238000000137 annealing Methods 0.000 abstract description 3
- 238000005097 cold rolling Methods 0.000 abstract description 3
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 238000004140 cleaning Methods 0.000 description 5
- 230000002441 reversible effect Effects 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 208000020442 loss of weight Diseases 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000012546 transfer Methods 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
- 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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- 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 present invention relates to a kind of hot forming preparation methods of high-carbon hot continuous rolling pickling steel band, belong to the preparation technical field of pickling steel band.The technical problem to be solved by the present invention is to provide the preparation methods of the hot forming high-carbon hot continuous rolling pickling steel band of low cost.This method is with C, based on Mn element, improve C content, do not adding Nb, Ti, V, B, Mo, La, under conditions of the alloying elements such as Cr, it controls smelting procedure and guarantees slab purity of steel, under the premise of chemical component is uniform, it is equipped with reasonable Controlled Rolling And Controlled Cooling technique, obtain moderate strength, the higher hot rolled steel plate of elongation percentage, it is clipped, blanking, after heating, carry out hot forming, after heat treatment, it is final to obtain moderate strength, the higher components of plasticity and toughness, it is widely used in automobile structure, alternative alloy part content and the higher high-strength vehicle structure hot rolling of production cost and cold-rolling continuous annealing steel plate and steel band.
Description
Technical field
The present invention relates to a kind of hot forming preparation methods of high-carbon hot continuous rolling pickling steel band, belong to the preparation of pickling steel band
Technical field.
Background technique
Hot rolling acid-cleaning plate is to remove oxide layer, trimming, finishing through pickling unit, mainly using high-quality hot rolled sheet as raw material
Process has hot rolling raw material uncoiling → laser welding → withdrawal straightening stands scale breading → pickling → rinsing → online smooth → trimming → online
Oiling → bundling → is packed and stored, surface quality and requirement (mainly cold bending or punching performance) between hot rolled plate and
Intermediate products between cold-reduced sheet are the ideal substitute products of part hot rolled plate and cold-reduced sheet.Hot rolling acid-cleaning plate is plate market
Emerging product, market development direction essentially consist in substitution cold-reduced sheet and substitution hot rolled plate, especially in recent years, high surface matter
Amount, high formability acid-cleaning plate substitution think gauge cold-reduced sheet have become the development trend of international market.
Compared with hot rolled plate, the advantage of hot rolling acid-cleaning plate is essentially consisted in: surface quality is good, dimensional accuracy is high, any surface finish
Degree is high, can be reduced user disperses environmental pollution caused by pickling；Compared with cold-reduced sheet, the advantage of acid-cleaning plate is guaranteeing surface
Under the premise of quality requirement, effectively reduce cost.
Hot forming techniques are the new technologies for being used to produce advanced high-strength steel pressing that exploitation in recent years is promoted.Steel plate is existed
More than austenitic temperature it is heated at high temperature, it is then stamping in fast transfer to module and quench, obtain martensitic structure or more
Item tissue, the strength of parts after punching press are up to 1700MPa grades, due to its high intensity, can be applied to automobile front/rear collision bumper, vehicle
The door car bodies safety component such as collision prevention girders and A column, B column, C column, middle channel.Due to loss of weight, to improve safety and mouldability strong etc.
Advantage, for this technology in the regional developments speed such as Europe, U.S., application of the high-intensitive and superhigh intensity component on vehicle body is more next
More, global hot stamping part demand in 2015 is more than 600,000,000, and automobile production and consumption big country of the China as the whole world,
Demand also sharply rises.
Existing hot forming generally adds the alloying elements such as Ti, Nb, B with steel, obtains the steel alloy of superhigh intensity.Than
Such as, patent CN104195443A " the high-strength anti-bending strength hot forming steel of automobile and its manufacturing method " discloses a kind of high bending resistance
Hot forming steel and its manufacturing method, the main chemical compositions mass percent of the steel grade are as follows: 0.18%≤Cwt.≤0.30%,
Siwt.≤0.50%, 1.00%≤Mnwt.≤1.60%, Pwt.≤0.015%, Swt.≤0.002%, 0.1%≤Crwt.
≤ 0.3%, 0.02%≤Tiwt.≤0.06%, 0.02%≤Als wt≤0.06%, 0.0005%≤Bwt.≤0.004%,
[N]≤0.004%, [O]≤0.003%, remaining is Fe and inevitable impurity.Its manufacturing method is low-temperature heat casting
Base, two-stage control rolling, rapid cooling, low temperature batch, and prepare coil of strip through cold rolling and critical annealing, shearing prepares part material
It is piece, hot-forming.Crystal grain can be refined by the manufacturing method, material plasticity and toughness is improved, absorbs it in deformation process
More energy improve vehicle safety.But Ti, B alloying element need to be added in the manufacturing method, can reach the raising strength of materials
Purpose, final yield strength reaches 1000MPa or more, tensile strength 1300MPa or more, and elongation percentage reaches 5% or more, is super
High-strength hot forming steel, although intensity is higher, elongation percentage is lower, usually 10% hereinafter, can be real after Cr alloying element is added
Now expand the purpose of rolling mill practice window, but this will increase design of material cost.
And it is relatively fewer for the research of low cost, middle high-strength hot forming steel, it is strong in currently used automobile structure
Degree steel be QSTE420 or QSTE500, the steel of these trades mark, mostly cold deformation hot-rolled steel, tensile strength be 400~
600MPa, but the alloying elements such as Ti, Nb, higher cost are still added in ingredient.
Summary of the invention
The technical problem to be solved by the present invention is to provide the preparation sides of the hot forming high-carbon hot continuous rolling pickling steel band of low cost
Method.
The preparation method of hot forming of the present invention high-carbon hot continuous rolling pickling steel band is successively opened including hot continuous rolling, hot rolling raw material
Volume, scale breading and pickling, obtain high-carbon hot continuous rolling pickling steel band, wherein the chemical component of steel billet is by following weight hundred before hot continuous rolling
The group of ratio is divided to be grouped as: 0.20≤C≤0.45%, Si≤1.00%, 1.00≤Mn≤1.80%, P≤0.015%, S≤
0.005%, 0.010≤Als≤0.060%, N≤0.0050%, O≤0.0040%, remaining is Fe and inevitable impurity；
When the hot continuous rolling, billet heating temperature is 1180~1240 DEG C, and finishing temperature is 820~900 DEG C, coiling temperature
It is 580~680 DEG C；
The scale breading breaks phosphorus using withdrawal straightening stands, and withdrawal straightening stands elongation percentage is 1.0~2.0%.
Preferably, hot forming high-carbon hot continuous rolling pickling steel band yield strength ReH>=355MPa, tensile strength Rm490
~680MPa, elongation percentage A80>=20%.Through being heat-treated rear surface practical decarburized depth within the scope of 880~950 DEG C less than 20 μm, and power
It learns performance and is all satisfied requirement.
Further, the specific steps of the method for the present invention are as follows: vanadium extraction from hot metal → desulfurization → converter smelting → LF refining → RH
Room temperature → hot rolling raw material uncoiling is batched → is air-cooled in refining → continuous casting → heating stove heating → roughing → finish rolling → section cooling →
→ laser welding → withdrawal straightening stands scale breading → pickling → rinsing → trimming → online oiling → bundling → is packed and stored.
Preferably, when the heating stove heating, slab charging temperature≤300 DEG C.
Preferably, Argon processing is carried out when the converter smelting, the RH refining latter stage carries out Calcium treatment.
Further, the preferably described hot forming non-metallic inclusion A class of high-carbon hot continuous rolling pickling steel band, B class, C class,
D class and DS class are respectively less than 1.0 grades.
Compared with prior art, the invention has the following beneficial effects:
The present invention is improved C content, is not being added the alloying elements such as Nb, Ti, V, B, Mo, La, Cr based on C, Mn element
Under the conditions of, under the premise of smelting procedure guarantees that slab purity of steel, chemical component are uniform, it is equipped with reasonable Controlled Rolling And Controlled Cooling
Technique obtains moderate strength, the higher hot rolled steel plate of elongation percentage, after clipped, blanking, heating, carries out hot forming, heat treatment
Afterwards, moderate strength is finally obtained, the higher components of plasticity and toughness are widely used in automobile structure, and alternative alloy part contains
Amount and the higher high-strength vehicle structure hot rolling of production cost and cold-rolling continuous annealing steel plate and steel band.
Specific embodiment
The preparation method of hot forming of the present invention high-carbon hot continuous rolling pickling steel band is successively opened including hot continuous rolling, hot rolling raw material
Volume, scale breading and pickling, obtain high-carbon hot continuous rolling pickling steel band, wherein the chemical component of steel billet is by following weight hundred before hot continuous rolling
The group of ratio is divided to be grouped as: 0.20≤C≤0.45%, Si≤1.00%, 1.00≤Mn≤1.80%, P≤0.015%, S≤
0.005%, 0.010≤Als≤0.060%, N≤0.0050%, O≤0.0040%, remaining is Fe and inevitable impurity；
When the hot continuous rolling, billet heating temperature is 1180~1240 DEG C, and finishing temperature is 820~900 DEG C, coiling temperature
It is 580~680 DEG C；
The scale breading breaks phosphorus using withdrawal straightening stands, and withdrawal straightening stands elongation percentage is 1.0~2.0%.
Preferably, hot forming high-carbon hot continuous rolling pickling steel band yield strength ReH>=355MPa, tensile strength Rm490
~680MPa, elongation percentage A80>=20%.Through being heat-treated rear surface practical decarburized depth within the scope of 880~950 DEG C less than 20 μm, and power
It learns performance and is all satisfied requirement.
Further, the specific steps of the method for the present invention are as follows: vanadium extraction from hot metal → desulfurization → converter smelting → LF refining → RH
Room temperature → hot rolling raw material uncoiling is batched → is air-cooled in refining → continuous casting → heating stove heating → roughing → finish rolling → section cooling →
→ laser welding → withdrawal straightening stands scale breading → pickling → rinsing → trimming → online oiling → bundling → is packed and stored.
Preferably, when the heating stove heating, slab charging temperature≤300 DEG C.
Preferably, Argon processing is carried out when the converter smelting, the RH refining latter stage carries out Calcium treatment.
Further, the non-metallic inclusion of the hot forming high-carbon hot continuous rolling pickling steel band meets the requirement of table 1.
Table 1 is with non-metallic inclusion requirement
It is preferred that non-metallic inclusion A class, B class, C class, D class and DS class of the hot forming with high-carbon hot continuous rolling pickling steel band
Respectively less than 1.0 grades.
Specifically, the method for the present invention is that molten iron is successively refined through vanadium extraction, desulfurization, converter (Argon is needed to handle), LF refining, RH
(the process latter stage carries out Calcium treatment) is casting continuously to form slab；Slab temperature be down to 300 DEG C or less can shove charge, be heated to 1180~
1240 DEG C, through 5 passes of single stand reversible roughing mill at intermediate base, then enter 7 rack hot continuous rollings after Coil Box is kept the temperature
Mm finishing mill unit, start rolling temperature are 980~1050 DEG C, and finishing temperature is 820~900 DEG C, then enter after section cooling and batch
Machine batches to obtain strip, and coiling temperature is 580~680 DEG C；Coil of strip be air-cooled to room temperature can uncoiling, coil of strip uncoiling need to use anti-crease rollers,
Through withdrawal straightening stands scale breading (withdrawal straightening stands elongation percentage be 1.0~2.0%), again through pickling unit pickling, then oiling is packaged into
Product.
A specific embodiment of the invention is further described below with reference to embodiment, is not therefore limited the present invention
System is among the embodiment described range.
Embodiment 1
Inexpensive hot forming high-carbon hot continuous rolling pickling steel is produced using 2050 Hot Rolling Mills (7 rack rolling finishing mill group)
Band.The chemical component weight percentage of the steel billet of starting are as follows: Cwt.:0.41%, Siwt.:0.25%, Mnwt.:1.18%,
Pwt.:0.007%, Swt.:0.002%, Alswt.:0.036%, [N]: 0.0040%, [O]: 0.0029%, remaining for Fe and
Inevitable impurity.Its production process are as follows: vanadium extraction from hot metal → desulfurization → converter (Argon is needed to handle) → LF refining → RH refining
(the process latter stage carries out Calcium treatment) → continuous casting → heating stove heating (slab charging temperature≤300 DEG C) → roughing → finish rolling → layer
Stream cool down → batches → is air-cooled to room temperature → raw material uncoiling → laser welding → withdrawal straightening stands scale breading → pickling → rinsing → trimming
→ online oiling → bundling → is packed and stored.Steel billet 230mm × 1450mm × Cmm, through 1210 DEG C heating after, after coming out of the stove after remove
Squama, through 5 passes of single stand reversible roughing mill at 42mm × 1450mm × C1The intermediate base of mm, then kept the temperature through Coil Box,
7 rolling finishing mill groups are subsequently entered, 5.0mm × 1450mm × C is rolled into2The coil of strip of mm, start rolling temperature are 1020 DEG C, finish to gauge temperature
Degree is 835 DEG C.Enter coiling machine after section cooling and batch to obtain strip, coiling temperature is 586 DEG C.Coilcooling to room temperature (≤
40 DEG C), through uncoiling (anti-crease rollers need to be used), weld together with the tail portion of preceding a roll, then through withdrawal straightening stands scale breading, subsequently enter acid
Slot pickling, pickling speed 80m/min, then oiling bundling, obtaining specification is 5.0mm × 1450mm × C2The hot forming high-carbon of mm
Hot continuous rolling pickling steel band.
After measured, the hot forming of production is as follows with the performance of high-carbon hot continuous rolling pickling steel band: yield strength, tensile strength,
Elongation percentage is respectively 475MPa, 670MPa, 21.5%；Non-metallic inclusion A class, B class, C class, D class and DS class are respectively less than 1.0
Grade.Through being heat-treated rear surface practical decarburized depth within the scope of 880~950 DEG C less than 20 μm, and mechanical property is all satisfied requirement.
Yield strength, tensile strength, elongation percentage, the measuring method of non-metallic inclusion rank in present example are all
It is measured by national standard.
Embodiment 2
Inexpensive hot forming high-carbon hot continuous rolling pickling steel is produced using 2050 Hot Rolling Mills (7 rack rolling finishing mill group)
Band.The chemical component weight percentage of the steel billet of starting are as follows: Cwt.:0.22%, Siwt.:0.22%, Mnwt.:1.76%,
Pwt.:0.009%, Swt.:0.003%, Alswt.:0.043%, [N]: 0.0049%, [O]: 0.0033%, remaining for Fe and
Inevitable impurity.Its production process are as follows: vanadium extraction from hot metal → desulfurization → converter (Argon is needed to handle) → LF refining → RH refining
(the process latter stage carries out Calcium treatment) → continuous casting → heating stove heating (slab charging temperature≤300 DEG C) → roughing → finish rolling → layer
Stream cool down → batches → is air-cooled to room temperature → raw material uncoiling → laser welding → withdrawal straightening stands scale breading → pickling → rinsing → trimming
→ online oiling → bundling → is packed and stored.Steel billet 230mm × 1450mm × Cmm, through 1210 DEG C heating after, after coming out of the stove after remove
Squama, through 5 passes of single stand reversible roughing mill at 42mm × 1400mm × C1The intermediate base of mm, then kept the temperature through Coil Box,
7 rolling finishing mill groups are subsequently entered, 6.0mm × 1400mm × C is rolled into2The coil of strip of mm, start rolling temperature are 1000 DEG C, finish to gauge temperature
Degree is 881 DEG C.Enter coiling machine after section cooling and batch to obtain strip, coiling temperature is 620 DEG C.Coilcooling to room temperature (≤
40 DEG C), through uncoiling (anti-crease rollers need to be used), weld together with the tail portion of preceding a roll, then through withdrawal straightening stands scale breading, subsequently enter acid
Slot pickling, pickling speed 70m/min, then oiling bundling, obtaining specification is 6.0mm × 1400mm × C2The hot forming high-carbon of mm
Hot continuous rolling pickling steel band.
After measured, the hot forming of production is as follows with the performance of high-carbon hot continuous rolling pickling steel band: yield strength, tensile strength,
Elongation percentage is respectively 462MPa, 654MPa, 25.0%；Non-metallic inclusion A class, B class, C class, D class and DS class are respectively less than 1.0
Grade.Through being heat-treated rear surface practical decarburized depth within the scope of 880~950 DEG C less than 20 μm, and mechanical property is all satisfied requirement.
Yield strength, tensile strength, elongation percentage, the measuring method of non-metallic inclusion rank in present example are all
It is measured by national standard.
Embodiment 3
Inexpensive hot forming high-carbon hot continuous rolling pickling steel is produced using 2050 Hot Rolling Mills (7 rack rolling finishing mill group)
Band.The chemical component weight percentage of the steel billet of starting are as follows: Cwt.:0.30%, Siwt.:0.38%, Mnwt.:1.45%,
Pwt.:0.005%, Swt.:0.004%, Alswt.:0.031%, [N]: 0.0038%, [O]: 0.0026%, remaining for Fe and
Inevitable impurity.Its production process are as follows: vanadium extraction from hot metal → desulfurization → converter (Argon is needed to handle) → LF refining → RH refining
(the process latter stage carries out Calcium treatment) → continuous casting → heating stove heating (slab charging temperature≤300 DEG C) → roughing → finish rolling → layer
Stream cool down → batches → is air-cooled to room temperature → raw material uncoiling → laser welding → withdrawal straightening stands scale breading → pickling → rinsing → trimming
→ online oiling → bundling → is packed and stored.Steel billet 230mm × 1250mm × Cmm, through 1210 DEG C heating after, after coming out of the stove after remove
Squama, through 5 passes of single stand reversible roughing mill at 42mm × 1250mm × C1The intermediate base of mm, then kept the temperature through Coil Box,
7 rolling finishing mill groups are subsequently entered, 3.0mm × 1250mm × C is rolled into2The coil of strip of mm, start rolling temperature are 1000 DEG C, finish to gauge temperature
Degree is 842 DEG C.Enter coiling machine after section cooling and batch to obtain strip, coiling temperature is 656 DEG C.Coilcooling to room temperature (≤
40 DEG C), through uncoiling (anti-crease rollers need to be used), weld together with the tail portion of preceding a roll, then through withdrawal straightening stands scale breading, subsequently enter acid
Slot pickling, pickling speed 90m/min, then oiling bundling, obtaining specification is 3.0mm × 1250mm × C2The hot forming high-carbon of mm
Hot continuous rolling pickling steel band.
After measured, the hot forming of production is as follows with the performance of high-carbon hot continuous rolling pickling steel band: yield strength, tensile strength,
Elongation percentage is respectively 408MPa, 590MPa, 23.5%；Non-metallic inclusion A class, B class, C class, D class and DS class are respectively less than 0.5
Grade.Through being heat-treated rear surface practical decarburized depth within the scope of 880~950 DEG C less than 20 μm, and mechanical property is all satisfied requirement.
Yield strength, tensile strength, elongation percentage, the measuring method of non-metallic inclusion rank in present example are all
It is measured by national standard.
Embodiment 4
Inexpensive hot forming high-carbon hot continuous rolling pickling steel is produced using 2050 Hot Rolling Mills (7 rack rolling finishing mill group)
Band.The chemical component weight percentage of the steel billet of starting are as follows: Cwt.:0.26%, Siwt.:0.38%, Mnwt.:1.35%,
Pwt.:0.005%, Swt.:0.002%, Alswt.:0.031%, [N]: 0.0038%, [O]: 0.0026%, remaining for Fe and
Inevitable impurity.Its production process are as follows: vanadium extraction from hot metal → desulfurization → converter (Argon is needed to handle) → LF refining → RH refining
(the process latter stage carries out Calcium treatment) → continuous casting → heating stove heating (slab charging temperature≤300 DEG C) → roughing → finish rolling → layer
Stream cool down → batches → is air-cooled to room temperature → raw material uncoiling → laser welding → withdrawal straightening stands scale breading → pickling → rinsing → trimming
→ online oiling → bundling → is packed and stored.Steel billet 230mm × 1250mm × Cmm, through 1210 DEG C heating after, after coming out of the stove after remove
Squama, through 5 passes of single stand reversible roughing mill at 42mm × 1250mm × C1The intermediate base of mm, then kept the temperature through Coil Box,
7 rolling finishing mill groups are subsequently entered, 3.0mm × 1250mm × C is rolled into2The coil of strip of mm, start rolling temperature are 1000 DEG C, finish to gauge temperature
Degree is 834 DEG C.Enter coiling machine after section cooling and batch to obtain strip, coiling temperature is 588 DEG C.Coilcooling to room temperature (≤
40 DEG C), through uncoiling (anti-crease rollers need to be used), weld together with the tail portion of preceding a roll, then through withdrawal straightening stands scale breading, subsequently enter acid
Slot pickling, pickling speed 90m/min, then oiling bundling, obtaining specification is 3.0mm × 1250mm × C2The hot forming high-carbon of mm
Hot continuous rolling pickling steel band.
After measured, the hot forming of production is as follows with the performance of high-carbon hot continuous rolling pickling steel band: yield strength, tensile strength,
Elongation percentage is respectively 428MPa, 612MPa, 27.5%；Non-metallic inclusion A class, B class, C class, D class and DS class are respectively less than 0.5
Grade.Through being heat-treated rear surface practical decarburized depth within the scope of 880~950 DEG C less than 20 μm, and mechanical property is all satisfied requirement.
Yield strength, tensile strength, elongation percentage, the measuring method of non-metallic inclusion rank in present example are all
It is measured by national standard.
Comparative example 1
Using the method for embodiment 2, only change the chemical component of the steel billet of starting, chemical component weight percentage are as follows:
Cwt.:0.16%, Siwt.:0.32%, Mnwt.:1.78%, Pwt.:0.010%, Swt.:0.004%, Alswt.:
0.029%, [N]: 0.0033%, [O]: 0.0021%, remaining is Fe and inevitable impurity.
After measured, the hot forming of production is as follows with the performance of high-carbon hot continuous rolling pickling steel band: yield strength, tensile strength,
Elongation percentage is respectively 409MPa, 588MPa, 30.2%；Non-metallic inclusion A class, B class, C class, D class and DS class are respectively less than 0.5
Grade.But through being heat-treated rear surface practical decarburized depth within the scope of 880~950 DEG C up to 30 μm or more, and the yield strength after heat treatment
It is below 355MPa, is unsatisfactory for requiring.
Claims (5)
1. a kind of hot forming preparation method of high-carbon hot continuous rolling pickling steel band successively includes hot continuous rolling, the uncoiling of hot rolling raw material, breaks
Squama and pickling obtain high-carbon hot continuous rolling pickling steel band, it is characterised in that: the chemical component of steel billet is by following weight hundred before hot continuous rolling
The group of ratio is divided to be grouped as: 0.20≤C≤0.45%, Si≤1.00%, 1.18≤Mn≤1.80%, P≤0.015%, S≤
0.005%, 0.010≤Als≤0.060%, N≤0.0050%, O≤0.0040%, remaining is Fe and inevitable impurity；
When the hot continuous rolling, billet heating temperature is 1180~1240 DEG C, and finishing temperature is 820~900 DEG C, and coiling temperature is
580~680 DEG C；
The scale breading breaks phosphorus using withdrawal straightening stands, and withdrawal straightening stands elongation percentage is 1.0~2.0%；
Hot forming high-carbon hot continuous rolling pickling steel band yield strength ReH>=355MPa, tensile strength Rm490~680MPa prolongs
Stretch rate A80>=20%.
2. the hot forming according to claim 1 preparation method of high-carbon hot continuous rolling pickling steel band, it is characterised in that: production
The specific steps of method are as follows: vanadium extraction from hot metal → desulfurization → converter smelting → LF refining → RH refining → continuous casting → heating stove heating →
Room temperature → hot rolling raw material uncoiling → laser welding → withdrawal straightening stands scale breading is batched → is air-cooled in roughing → finish rolling → section cooling →
→ pickling → rinsing → trimming → online oiling → bundling → is packed and stored.
3. the hot forming according to claim 2 preparation method of high-carbon hot continuous rolling pickling steel band, it is characterised in that: described
When heating stove heating, slab charging temperature≤300 DEG C.
4. the hot forming according to claim 2 preparation method of high-carbon hot continuous rolling pickling steel band, it is characterised in that: described
Argon processing is carried out when converter smelting, the RH refining latter stage carries out Calcium treatment.
5. the hot forming according to claim 2 preparation method of high-carbon hot continuous rolling pickling steel band, it is characterised in that: described
Hot forming is respectively less than 1.0 grades with non-metallic inclusion A class, B class, C class, D class and the DS class of high-carbon hot continuous rolling pickling steel band.
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Application publication date: 20170315 Assignee: PANGANG GROUP PANZHIHUA STEEL & VANADIUM Co.,Ltd. Assignor: PANGANG GROUP PANZHIHUA IRON & STEEL RESEARCH INSTITUTE Co.,Ltd. Contract record no.: X2024980004525 Denomination of invention: A Preparation Method for High Carbon Hot Rolling Pickled Steel Strip for Hot Forming Granted publication date: 20190122 License type: Common License Record date: 20240417 |