CN106834937A - A kind of 530MPa grades of Thin Specs galvanized steel and its production method - Google Patents
A kind of 530MPa grades of Thin Specs galvanized steel and its production method Download PDFInfo
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- CN106834937A CN106834937A CN201710007607.6A CN201710007607A CN106834937A CN 106834937 A CN106834937 A CN 106834937A CN 201710007607 A CN201710007607 A CN 201710007607A CN 106834937 A CN106834937 A CN 106834937A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- 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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
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Abstract
A kind of 530MPa grades of Thin Specs galvanized steel and production method, chemical composition (wt%)：C：0.08~0.12, Si≤0.06, Mn：1.1~1.5, P≤0.016, S≤0.008, Nb：0.040~0.055, Als：0.020~0.045, N≤0.007, Ti：0.015~0.030, Ca：0.0015~0.0045, remaining is Fe；Converter, LF refining use low nitrogen pattern, acid-soluble aluminum content 0.025~0.045% before LF refining Calcium treatment, and Calcium treatment argon bottom-blowing blows 6~15min of molten steel and terminates refining only；Soluble aluminium content≤0.004wt% when terminating to refine, the ratio between Soluble aluminium and calcium content≤2.5, carry out Calcium treatment as target；Galvanized steel of the present invention meets surface quality rank FB requirements in GB2518 and EN10346.
Description
Technical field
The invention belongs to technical field of metallurgical sheet production, more particularly to 530MPa grades that a kind of thickness is 0.9~2.5mm
Thin Specs galvanized steel and its production method.
Background technology
With the growth of auto output, people increasingly pay attention to the discharge of vehicle exhaust；Application of the high-strength steel on automobile,
On the one hand automotive light weight technology is advantageously implemented, vehicle exhaust discharge quantity is reduced, occupant is on the other hand also improved and is protected safely
Barrier；What is more important, in order to ensure Automobile Plate decay resistance, the usage amount of zinc-plated Automobile Plate is also increasing year by year.At present
The production method of zinc-plated Automobile Plate of the production tensile strength more than 530MPa is mainly the phase transformation strengthening sides such as dual phase steel, Multiphase Steel
The characteristics of method, its production method is the martensite formation elements such as addition Cr, Mo, and the tensile strength of steel, the work are improved using phase transformation
Process control difficulty is larger, and Cr, Mo cost of alloy of addition are high, at the same it is high to the quick cooling capacity requirement of galvanizing equipment,
It is unfavorable for popularization and application on a large scale.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of 530MPa grades of Thin Specs galvanized steel and its production method,
By control composition and optimized production process, can realize that low cost production thickness is on the premise of production control difficulty is reduced
0.9~2.5mm, tensile strength intensity are more than 530MPa, the Thin Specs galvanized steel of elongation percentage >=22%.
In order to solve the above technical problems, the technical solution adopted in the present invention is：
A kind of 530MPa grades of Thin Specs galvanized steel, the weight/mass percentage composition of its chemical composition is：C：0.08%~0.12%, Si：
≤ 0.06%, Mn：1.1%~1.5%, P：≤ 0.016%, S：≤ 0.008%, Nb：0.040%~0.055%, Als：0.020%~
0.045%, N：≤ 0.007%, Ti：0.015%~0.030%, Ca：0.0015%~0.0045%, balance of Fe.
A kind of 530MPa grades of above-mentioned Thin Specs galvanized steel, the weight/mass percentage composition of its chemical composition is preferably：C：
0.08%~0.10%, Si：≤ 0.06%, Mn：1.1%~1.5%, P：≤ 0.012%, S：≤ 0.008%, Nb：0.040%~
0.055%, Als：0.020%~0.045%, N：≤ 0.005%, Ti：0.015%~0.030%, Ca：0.0015%~0.0045%, it is remaining
It is Fe to measure.
A kind of production method of 530MPa grades of Thin Specs galvanized steel, the quality percentage of the galvanized steel chemical composition contains
Measure and be：C：0.08%~0.10%, Si：≤ 0.06%, Mn：1.1%~1.5%, P：≤ 0.012%, S：≤ 0.008%, Nb：0.040%
~0.055%, Als：0.020%~0.045%, N：≤ 0.005%, Ti：0.015%~0.030%, Ca：0.0015%~0.0045%,
Balance of Fe.
A kind of 530MPa grades of above-mentioned production method of Thin Specs galvanized steel, including smelting, hot rolling, it is zinc-plated before continuously move back
Fiery and zinc-plated rear finishing straightening operation, in the smelting procedure, converter, LF refining are smelted using low nitrogen pattern, and continuous casting protection is poured
Casting control nitrogen pick-up, 0.025%~0.045%, molten steel is in LF after Calcium treatment for the control of molten steel acid-soluble aluminum content before LF refining Calcium treatment
Under the protection of refining furnace cover, blow 6~15min of molten steel only using argon bottom-blowing and terminate refining；When terminating refining, acid is insoluble in molten steel
Aluminium weight/mass percentage composition is less than 0.004%, and the ratio between Soluble aluminium weight/mass percentage composition and calcium weight/mass percentage composition are not more than in molten steel
2.5, and carry out Calcium treatment as target.
A kind of 530MPa grades of above-mentioned production method of Thin Specs galvanized steel, acid is not when the end is refined, in molten steel
The ratio between molten aluminium weight/mass percentage composition and calcium weight/mass percentage composition are not more than 1.2, and carry out Calcium treatment as target.
A kind of 530MPa grades of above-mentioned production method of Thin Specs galvanized steel, the hot-rolled process slab heating temperature is
1210 DEG C~1250 DEG C, finish rolling start rolling temperature is 1050 DEG C~1100 DEG C, and finishing temperature is 860 DEG C~920 DEG C, and coiling temperature is
600 DEG C~680 DEG C, in course of hot rolling, it is incubated using stay-warm case, takes the leading portion type of cooling to be cooled to 710 DEG C~760 after finish to gauge
DEG C, 20~35 DEG C/S of cooldown rate.
A kind of 530MPa grades of above-mentioned production method of Thin Specs galvanized steel, in the zinc-plated preceding continuous annealing operation
Hot temperature is 790 DEG C~840 DEG C, and slow cooling temperature is 680 DEG C~710 DEG C, and rapid cooling temperature is 410 DEG C~465 DEG C, rapid cooling cooling rate control
20~35 DEG C/s of scope processed；Zinc-plated rear finishing elongation control scope 0.6%~1.5%, withdrawal straightening machine elongation control scope %0.1
~0.4%, finishing elongation percentage+straightening elongation percentage≤1.7%.
The inventive method sets N, Al content, by controlling hot rolling and lehr attendant to appropriate Nb, Mn alloy is added in steel
Skill, control band structure of steel while, control steel in Nb, ALN precipitate pattern, be distributed and realize that Mn is uniformly distributed, reach fine grain
Reinforcing, solution strengthening and precipitating reinforcing effect, realize that tensile strength reaches 530MPa；What is more important steel making working procedure terminates essence
During refining, Soluble aluminium weight/mass percentage composition is less than 0.004%, Soluble aluminium weight/mass percentage composition and calcareous amount in molten steel in molten steel
The ratio between percentage composition is not more than 2.5, and carries out Calcium treatment as target.
The present invention improves fine grain by advantages of simple on the premise of without alloying elements such as Cr, Mo using Nb elements
Invigoration effect, Mn element solid solution invigoration effects；Rationally reduce the Si elements of influence galvanizing surface quality and processability；Rationally drop
P, S element of low influence processability；Rationally addition Ti elements improve welding performance；Establish with Soluble aluminium in molten steel and Ca
The ratio between content is the calcium content method of adjustment of target, improves Molten Steel Cleanliness, it is ensured that the product ductility under the premise of high-strength.
Beneficial effects of the present invention are：
The galvanized steel product strength that the present invention is produced reaches 530MPa, and elongation percentage reaches more than 22%, has strip excellent
Processability, it is to avoid using dual phase steel, Multiphase Steel production technology, reduce production control difficulty；Addition Cr, Mo etc. are avoided simultaneously
Precious alloy, reduces production cost；Avoid using Si elements, improve galvanizing surface quality；The zinc-plated band that the inventive method is obtained
The tensile strength of steel is 530~590MPa, and 460~500MPa of yield strength, elongation percentage is 22~27%；Thickness range can be produced
0.9-2.5mm, while the control of FB ranks is required during galvanizing surface quality fully meets GB2518 and EN10346, thickness≤1.2mm
Product can reach surface quality rank FC controls and require.
Specific embodiment
A kind of 530MPa grades of Thin Specs galvanized steel and its production method, the weight/mass percentage composition of galvanized steel chemical composition
For：C：0.08%~0.12%, preferably C：0.08%~0.10%；Si：≤0.06%；Mn：1.1%~1.5%；P：≤ 0.016%, preferably
P：≤0.012%；S：≤0.008%；Nb：0.040%~0.055%；Als：0.020%~0.045%；N：≤ 0.007%, preferably N：
≤0.005%；Ti：0.015%~0.030%；Ca：0.0015%~0.0045%；Balance of Fe；
Production method includes smelting, hot rolling, zinc-plated preceding continuous annealing and zinc-plated rear finishing straightening operation, in smelting procedure, converter,
LF refining is smelted using low nitrogen pattern, the control nitrogen pick-up of continuous casting protective casting, molten steel acid-soluble aluminum content control before LF refining Calcium treatment
0.025%~0.045%, after Calcium treatment molten steel under the protection of LF refining bell, blown only using argon bottom-blowing molten steel 6~
15min terminates refining；When terminating refining, Soluble aluminium weight/mass percentage composition is less than 0.004%, Soluble aluminium in molten steel in molten steel
The ratio between weight/mass percentage composition and calcium weight/mass percentage composition≤2.5, preferably≤1.2, and Calcium treatment is carried out as target；
In hot-rolled process slab heating temperature be 1210 DEG C~1250 DEG C, finish rolling start rolling temperature be 1050 DEG C~1100 DEG C, finish to gauge
Temperature is 860 DEG C~920 DEG C, and coiling temperature is 600 DEG C~680 DEG C, in course of hot rolling, is incubated using stay-warm case, is adopted after finish to gauge
Take the leading portion type of cooling and be cooled to 710 DEG C~760 DEG C, 20~35 DEG C/S of cooldown rate；
Soaking temperature is 790 DEG C~840 DEG C in zinc-plated preceding continuous annealing operation, and slow cooling temperature is 680 DEG C~710 DEG C, rapid cooling temperature
It is 410 DEG C~465 DEG C to spend, 20~35 DEG C/s of rapid cooling cooling rate control range；Zinc-plated rear finishing elongation control scope 0.6%~
1.5%, withdrawal straightening machine elongation control scope %0.1~0.4%, finishing elongation percentage+straightening elongation percentage≤1.7%.
With reference to specific embodiment, the present invention is further detailed explanation：
Embodiment 1~13 is using converter smelting, LF refining, continuous casting, hot rolling, cold rolling, continuous annealing, zinc-plated production process；
Smelting procedure：The chemical composition of casting is shown in Table 1 after continuous casting：
The casting chemical composition of table 1
Hot-rolled process：
There is the solid solution of second phase particles and precipitation, the deformation of austenite and recrystallization, ferritic transformation in course of hot rolling, because
This hot rolling is the important step of quality control；The joint of heating-up temperature, finishing temperature and coiling temperature is set, and controls finish rolling
Leading portion cooling afterwards, can cause the tiny Secondary phase particle of disperse to separate out, and realize crystal grain refinement；The specific technological parameter of hot-rolled process
It is shown in Table 2：
The hot-rolled process parameter of table 2
| Embodiment | Heating-up temperature/DEG C | Finish rolling start rolling temperature/DEG C | Finishing temperature/DEG C | Leading portion cooldown rate/DEG C/S | Coiling temperature/DEG C |
| 1 | 1215 | 1050 | 860 | 21 | 620 |
| 2 | 1250 | 1090 | 920 | 22 | 650 |
| 3 | 1225 | 1080 | 910 | 35 | 600 |
| 4 | 1249 | 1100 | 911 | 22 | 610 |
| 5 | 1210 | 1065 | 880 | 26 | 600 |
| 6 | 1235 | 1070 | 900 | 20 | 680 |
| 7 | 1243 | 1090 | 916 | 30 | 660 |
| 8 | 1230 | 1060 | 890 | 33 | 640 |
| 9 | 1220 | 1060 | 900 | 25 | 635 |
| 10 | 1230 | 1090 | 910 | 22 | 640 |
| 11 | 1235 | 1070 | 890 | 29 | 635 |
| 12 | 1240 | 1090 | 900 | 28 | 649 |
| 13 | 1241 | 1080 | 910 | 30 | 630 |
Zinc-plated preceding continuous annealing and zinc-plated rear finishing straightening technique：
The zinc-plated preceding rational soaking of continuous annealing process step design, slow cooling, rapid cooling temperature and cooling rate, obtain galvanized steel institute required
Microscopic structure；Soaking temperature ensures to form grain size and form is uniform, control slow cooling temperature, rapid cooling temperature and cooldown rate
, to diffusion in austenite, using spreading, the phase-change mechanism new pig iron of reduction is plain for C, N element in promoting the ferrite crystal grain of equal thermosetting
Body impurity content, and ensure that crystal grain is more uniform tiny, grow up not too much；Specific continuous annealing and finishing straightening technological parameter are shown in Table
3：
The zinc-plated preceding continuous annealing of table 3 and finishing straightening technique
The galvanized steel product mechanical property that embodiment 1~13 is produced is shown in Table 4：
The product mechanical property of table 4
As shown in Table 4, embodiment 1-13 products obtained therefroms are entirely capable of meeting the 530MPa grades of performance requirement of galvanized steel；In addition in table
On the basis of 4, consolidated statement 1-3, the especially production method of embodiment 1,7,11,12 is more beneficial for 530MPa grades of Thin Specs in each embodiment
Galvanized steel is produced, and the galvanized steel product comprehensive mechanical property for being produced is more excellent.
Claims (7)
1. a kind of 530MPa grades of Thin Specs galvanized steel, it is characterised in that：The quality percentage of the galvanized steel chemical composition contains
Measure and be：C：0.08%~0.12%, Si：≤ 0.06%, Mn：1.1%~1.5%, P：≤ 0.016%, S：≤ 0.008%, Nb：0.040%
~0.055%, Als：0.020%~0.045%, N：≤ 0.007%, Ti：0.015%~0.030%, Ca：0.0015%~0.0045%,
Balance of Fe.
2. a kind of 530MPa grades of Thin Specs galvanized steel as claimed in claim 1, it is characterised in that：The galvanized steel chemistry
Composition quality percentage composition is preferably：C：0.08%~0.10%, Si：≤ 0.06%, Mn：1.1%~1.5%, P：≤ 0.012%, S：
≤ 0.008%, Nb：0.040%~0.055%, Als：0.020%~0.045%, N：≤ 0.005%, Ti：0.015%~0.030%,
Ca：0.0015%~0.0045%, balance of Fe.
3. a kind of production method of 530MPa grades of Thin Specs galvanized steel, it is characterised in that：The galvanized steel chemical composition
Weight/mass percentage composition is：C：0.08%~0.10%, Si：≤ 0.06%, Mn：1.1%~1.5%, P：≤ 0.012%, S：≤ 0.008%,
Nb：0.040%~0.055%, Als：0.020%~0.045%, N：≤ 0.005%, Ti：0.015%~0.030%, Ca：0.0015%
~0.0045%, balance of Fe.
4. a kind of 530MPa grades of Thin Specs galvanized steel as claimed in claim 3, it is characterised in that：Including smelting, hot rolling, plating
The preceding continuous annealing of zinc and zinc-plated rear finishing straightening operation, in the smelting procedure, converter, LF refining are smelted using low nitrogen pattern,
Continuous casting protective casting controls nitrogen pick-up, and the control of molten steel acid-soluble aluminum content is in 0.025%~0.045%, Calcium treatment before LF refining Calcium treatment
Molten steel is blown 6~15min of molten steel using argon bottom-blowing and terminates refining only under the protection of LF refining bell afterwards；When terminating refining, steel
Soluble aluminium weight/mass percentage composition is less than 0.004% in water, Soluble aluminium weight/mass percentage composition and calcium weight/mass percentage composition in molten steel
The ratio between be not more than 2.5, and carry out Calcium treatment as target.
5. a kind of 530MPa grades of Thin Specs galvanized steel as claimed in claim 4, it is characterised in that：During the end refining,
The ratio between Soluble aluminium weight/mass percentage composition and calcium weight/mass percentage composition are not more than 1.2 in molten steel, and are carried out at calcium as target
Reason.
6. a kind of 530MPa grades of Thin Specs galvanized steel as claimed in claim 5, it is characterised in that：The hot-rolled process slab
Heating-up temperature is 1210 DEG C~1250 DEG C, and finish rolling start rolling temperature is 1050 DEG C~1100 DEG C, and finishing temperature is 860 DEG C~920 DEG C,
Coiling temperature is 600 DEG C~680 DEG C, in course of hot rolling, is incubated using stay-warm case, takes the leading portion type of cooling to be cooled to after finish to gauge
710 DEG C~760 DEG C, 20~35 DEG C/S of cooldown rate.
7. a kind of 530MPa grades of Thin Specs galvanized steel as claimed in claim 6, it is characterised in that：It is described it is zinc-plated before continuously move back
Soaking temperature is 790 DEG C~840 DEG C in firer's sequence, and slow cooling temperature is 680 DEG C~710 DEG C, and rapid cooling temperature is 410 DEG C~465 DEG C,
20~35 DEG C/s of rapid cooling cooling rate control range；Zinc-plated rear finishing elongation control scope 0.6%~1.5%, withdrawal straightening machine elongation percentage control
Scope %0.1~0.4% processed, finishing elongation percentage+straightening elongation percentage≤1.7%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107326277A (en) * | 2017-06-20 | 2017-11-07 | 河钢股份有限公司邯郸分公司 | 480MPa grades of galvanized steels and its production method |
| CN115109994A (en) * | 2021-03-22 | 2022-09-27 | 宝山钢铁股份有限公司 | High-strength cold-rolled hot-galvanized microalloy strip steel and manufacturing method thereof |
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| CN104017969A (en) * | 2014-06-18 | 2014-09-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Cold-rolled steel sheet, preparation method thereof, hot galvanized steel sheet and preparation method thereof |
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| CN107326277B (en) * | 2017-06-20 | 2019-01-25 | 河钢股份有限公司邯郸分公司 | 480MPa grades of galvanized steels and its production method |
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| CN115109994B (en) * | 2021-03-22 | 2023-09-12 | 宝山钢铁股份有限公司 | High-strength cold-rolled hot-dip galvanized microalloy strip steel and manufacturing method thereof |
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