CN108396260A - The high-strength high reaming performance galvanized steel plain sheet of one kind and its manufacturing method - Google Patents

The high-strength high reaming performance galvanized steel plain sheet of one kind and its manufacturing method Download PDF

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CN108396260A
CN108396260A CN201710064850.1A CN201710064850A CN108396260A CN 108396260 A CN108396260 A CN 108396260A CN 201710064850 A CN201710064850 A CN 201710064850A CN 108396260 A CN108396260 A CN 108396260A
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bainite
steel plate
plain sheet
temperature
steel
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CN108396260B (en
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吕家舜
李峰
杨洪刚
周芳
刘仁东
王铁军
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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Abstract

The high-strength high reaming performance galvanized steel plain sheet of one kind and its manufacturing method, steel plate ingredient：C 0.16~0.60%, Si 0.50~2.5%, Mn 1.10~4.00%, P≤0.020%, S≤0.010%, Al 0.02~3.00% also contains Cr 0.30~1.50%, Mo 0.25~0.60%, Ni 0.50~2.50%, Cu 0.20~0.50%, V 0.05~0.50%, at least one of Ti 0.02~0.20%, Nb 0.02~0.20%.Recrystallization annealing galvanizing is carried out in continuous hot galvanizing line, control hot rolled steel plate is organized as ferrite+lower bainite, cold-rolled compression ratio 30~70%, continuous annealing is heated to 800~930 DEG C with the speed of >=20 DEG C/s, it is cooled to bainite transformation temperature with the speed of >=40 DEG C/s, belt steel temperature is adjusted after transformation to 450~480 DEG C of progress galvanizings by dipping, is cooled to room temperature later.There is galvanized steel plain sheet of the present invention excellent plasticity, welding performance, processability, reaming performance and Extending flange Perfor, production method to have fabulous economy and high efficiency.

Description

The high-strength high reaming performance galvanized steel plain sheet of one kind and its manufacturing method
Technical field
The invention belongs to cold-rolling galvanization steel plate manufacturing technology field, more particularly to a kind of high-strength high-plasticity cold-rolling galvanization steel Plate and its manufacturing method.
Background technology
With the continuous improvement of energy conservation and environmental protection provisions of laws and regulations, steel and iron industry must constantly promote the performance of product with full Such requirement of foot.Improve steel products intensity with the overall usage amount of saving steel, improve steel corrosion resistance to carry The needs of service life of high steel, high-strength galvanized sheet can just meet in terms of the two, therefore obtained in recent years Prodigious development successively has the galvanized sheet of the steel grades such as dual phase steel, TRIP steel to be developed and obtains prodigious commercial Success.
But there is soft phase ferrite and hard phase martensite/bainite in these steel, in Pressing Deformation, the mistake of reaming Cheng Zhonghui occurs not matching between soft phase and hard phase, cracks, causes the reaming performance of steel plate poor.Bainite steel plate has There is more excellent reaming performance, but its plasticity is bad to affect comprehensive mechanical performance.
Number of patent application 201010283882.9,201110383478.3,201210195411.1,201210268312.1 It is the production mainly for hot rolled steel plate.201010283882.9 disclosing a kind of high-elongation high strength low carbon bainibic steel Plate and its production method, chemical composition C0.06-0.18%, Si0.55%-1.70%, Mn1.1-1.7, also contain The alloying elements such as Nb, V, Ti, Cr, Ni, Mo, Cu, technique are controlled rolling and the control cooling of hot rolling, are subsequently carried out at some heat Reason；It is organized as bainite, martensite and retained austenite.201110383478.3 provide a kind of ultralow-carbon bainite steel plate and Its manufacturing method, chemical composition be C≤0.03%, Si≤0.15%%, Mn1.2-1.6%, also contain some Nb, V, Ti, The alloying elements such as Cu, Ni, B obtain ultralow-carbon bainite steel plate using the method for controlled rolling and controlled cooling, and carry out 500-600 DEG C of time Fire processing is finally organized as tempering ultra-low carbon bainite+disperse educt object.201210195411.1 then disclosing a kind of Ultra-low carbon Bainite steel plate and its manufacturing method, similar with 201110383478.3, only C content is slightly higher, and Mn contents 3.0-4.5% is very Height, without containing noble elements such as Cu, Ni.201210268312.1 disclosed one kind plate containing B bainitic steel and its manufacturing method, Its chemical composition is C0.20-0.35%, Si0.6-1.6%%, Mn1.5-2.0%, additionally contains Ti, B, Al and impurity member Element, is organized as bainite, and finished product is hot rolled plate.
Existing open source information is also the achievement in research for hot rolled steel plate, the rarer zinc-plated bayesian of cold-rolled high-strength mostly The report of body steel plate.
Invention content
The present invention provides the high-strength high reaming performance galvanized steel plain sheet of one kind and its manufacturing method, and its object is to so that steel plate is had High intensity, high reaming performance, while there is high corrosion resistance, the consumption of energy resources, Promote Sustainable Development can be reduced.
For this purpose, this invention takes following technical solutions：
A kind of high-strength high reaming performance galvanized steel plain sheet, the chemical composition mass percent of steel plate are：C 0.16%~ 0.60%, Si0.50%~2.5%, Mn1.10%~4.00%, P≤0.020%, S≤0.010%, Al0.02%~ 3.00%, chemical composition also contain Cr0.30%~1.50%, Mo0.25%~0.60%, Ni0.50%~2.50%, Cu0.20%~0.50%, V0.05%~0.50%, Ti0.02%~0.20%, at least one in Nb0.02%~0.20% Kind；Remaining is Fe and some inevitable impurity elements；Steel plate is organized as bainite+retained austenite i.e. B+A, wherein bayesian Body volume fraction is 55%~85%, and retained austenite volume fraction is 15%~45%, the form of bainite be lath-shaped and Granular, retained austenite is distributed between bainite and inside bainite.
Also contain Ca0.0005%~0.005% in steel plate chemical composition, one kind in Mg0.0005%~0.005% or Two kinds.
A kind of manufacturing method of high-strength high reaming performance galvanized steel plain sheet, steel plate pass through smelting-continuous casting-hot rolling-pickling- After cold rolling, recrystallization annealing galvanizing is carried out in Continuous Hot Dip Galvanizing Line, wherein hot rolling finishing temperature is not less than 800 DEG C, 400 DEG C~600 DEG C of coiling temperature, the institutional framework for controlling hot rolled steel plate are ferrite+lower bainite, are distributed in bainite structure There is the carbide of small and dispersed, the compression ratio of cold rolling is 30%~70%, and Continuous Hot Dip Galvanizing Line is not provided with soaking zone, heating Section selects quick sensing heating；Continuous annealing process control is as follows：Speed to be not less than 20 DEG C/s quickly heats up to 800~ After 930 DEG C, it is cooled to bainite transformation temperature to be not less than the speed of 40 DEG C/s immediately, is adjusted after completing bainite isothermal transformation Whole belt steel temperature is to galvanizing by dipping is carried out within the scope of 450~480 DEG C, and bainite isothermal transformation time control is in 15~150s, zinc Liquid ingredient is containing 0.18%~0.50%Al, remaining is Zn and the zinc liquid of inevitable impurity, is cooled to room temperature later.
C 0.16%~0.60%, carbon determine the intensity of bainite in the steel of the present invention by solution strengthening, simultaneously Influence the stability of later stage retained austenite.To ensure the stability of overcooling austenite, it is needed to have higher carbon content；To protect Demonstrate,prove welding performance, it is desirable that limitation carbon content.
Si 0.50%~2.50% is non-carbide former, have higher solid solution strengthening effect, can promote C to Austenite is enriched with, and has " removing " and " purification " effect to the C being dissolved in ferrite, Si does not dissolve in cementite, therefore can hinder The austenite reacted by carbon spread-cementite transformation, stable austenite so that retained austenite is stabilized deposits at room temperature .Si too high levels, it will deteriorate the hot-dip energy of steel plate.
Mn 1.10~4.00%, manganese are typical austenite stabilizer elements, and the quenching degree of steel can be improved, and play one Fixed solution strengthening effect, Mn can reduce A3, A1 critical point, can postpone perlitic transformation simultaneously as the element for expanding γ phase regions Bainite transformation temperature is reduced, but also postpones and extend ferritic transformation simultaneously, Bainite Region is made to move to right, to make steel grade to control The sensibility of cold process conditions slightly reduces.High Mn contents easily cause hardening constituent zonal distribution in duplex structure, to make At the uneven of performance.
P≤0.020%, solution strengthening element inhibit the precipitation of cementite.
The fewer S≤0.010%, the impurity element in steel the better.Al 0.02%~3.00%, to the shadow of Austenite Morphology Sound is similar to Si, and as non-carbide formation element, C is promoted to be enriched with to austenite and inhibit the precipitation of cementite.
Al can also form AlN precipitations, play certain Grain refinement.
Cr0.3~1.5% can effectively improve the quenching degree of steel and prevent high temperature surface oxidation, while can improve resistance to Corrosive nature and raising intensity.
Mo0.25~0.60% effectively improves the quenching degree of steel, and can strengthen crystal boundary.Content has been difficult to less than 0.25% To above-mentioned effect, but content is more than 0.60% above-mentioned function and effect saturation, and cost is higher, should control in 0.2-0.6wt% In range.
Ni0.5~2.5%：Ni is austenitizing stable element, can effectively reduce Ms points, while can improve material modeling Property and low-temperature flexibility, but Ni prices are high, and content should control below 2.5%.
Cu0.2~0.50% realizes precipitation strength by the way that ε-Cu are precipitated, improves the intensity of steel.
V0.05~0.50%, Ti0.02~0.20%, Nb0.02~0.20%, to crystal grain refinement, transformation behavior, Ovshinsky C enrichments play remarkable effect in body.In the Nb delay thermal deformation process of solid solution condition static and dynamic recrystallization and austenite to Ferritic phase transformation, to expand the temperature range between dynamic recrystallization final temperature and Ac3, to be rolled in Unhydrated cement It provides convenience.Nb is combined with C and N to be formed tiny carbonitride also and can postpone to recrystallize, and ferrite crystal grain is prevented to grow up, from And there is strong refined crystalline strengthening effect and stronger precipitating reinforcing effect.
Ti, V have the function of precipitation strength.
Ca0.0005~0.005%, Mg0.0005~0.005%, Ca, Mg can purify steel, and modified field trash improves The comprehensive performance of steel.
Control hot-rolling coiling temperature so that the institutional framework of hot rolled steel plate is the tissue of ferrite+bainite, bainite group The carbide of small and dispersed is distributed in knitting, after cold rolling (reduction ratio is 30%~70%), carries out continuous annealing, continuous annealing Process control is as follows, and the speed to be not less than 20 DEG C/s quickly heats, until immediately to be not less than 40 DEG C/s after 800~930 DEG C Speed be cooled to bainite transformation temperature, carry out bainite isothermal transformation, adjust temperature thereafter and complete galvanizing by dipping, be cooled to Room temperature.In view of cold rolling ability, the reduction ratio of 30%-70% is selected, quickly heats, be quickly cooled down guarantee steel in austenite Crystal grain is tiny during change, and austenite is not carried out complete homogenization, can ensure in subsequent bainitic transformation Bainite structure is uniform tiny in the process.Higher cooling velocity, it can be ensured that generate ferrite bainite and granular bainite And retained austenite.Bainite Region isothermal can be such that C atoms are spread into retained austenite simultaneously, stable residual austenite, So that steel plate has better toughness.
Beneficial effects of the present invention are：
The present invention provides the cold-rolling galvanization steel plate and its production method of a kind of high reaming performance of high intensity, which has excellent Good plasticity, welding performance, processability, reaming performance, Extending flange Perfor.The production method have fabulous economy, High efficiency.Its tensile strength >=800MPa, elongation after fracture (A50) >=28%, λ >=40 have good toughness.
Specific implementation mode
The chemical composition of specific embodiment steel is shown in Table 1, and process processing parameter and performance are shown in Table 2.
The chemical composition wt% of 1 steel plate of table
The process processing parameter and performance of 2 steel plate of table

Claims (3)

1. a kind of high-strength high reaming performance galvanized steel plain sheet, which is characterized in that the chemical composition mass percent of steel plate is：C 0.16%~0.60%, Si0.50%~2.5%, Mn1.10%~4.00%, P≤0.020%, S≤0.010%, Al0.02%~3.00%, chemical composition also contain Cr0.30%~1.50%, Mo0.25%~0.60%, Ni0.50%~ 2.50%, Cu0.20%~0.50%, V0.05%~0.50%, Ti0.02%~0.20%, in Nb0.02%~0.20% It is at least one；Remaining is Fe and some inevitable impurity elements；Steel plate is organized as bainite+retained austenite i.e. B+A, Middle bainite volume fraction is 55%~85%, and retained austenite volume fraction is 15%~45%, and the form of bainite is plate Strip and granular, retained austenite are distributed between bainite and inside bainite.
2. high-strength high reaming performance galvanized steel plain sheet according to claim 1, which is characterized in that also contain in steel plate chemical composition Ca0.0005%~0.005%, one or both of Mg0.0005%~0.005%.
3. a kind of manufacturing method of high-strength high reaming performance galvanized steel plain sheet as described in claim 1, which is characterized in that steel plate passes through After smelting-continuous casting-hot rolling-pickling-cold rolling, recrystallization annealing galvanizing is carried out in Continuous Hot Dip Galvanizing Line, wherein Hot rolling finishing temperature be not less than 800 DEG C, 400 DEG C~600 DEG C of coiling temperature, control hot rolled steel plate institutional framework be ferrite+ The carbide of small and dispersed is distributed in bainite structure for lower bainite, and the compression ratio of cold rolling is 30%~70%, continuously dip coat Zinc production line is not provided with soaking zone, and bringing-up section selects quick sensing heating；Continuous annealing process control is as follows：To be not less than 20 DEG C/speed of s quickly heats up to after 800~930 DEG C, immediately bainite transformation temperature is cooled to be not less than the speed of 40 DEG C/s Degree completes after bainite isothermal transformation adjustment belt steel temperature to carrying out galvanizing by dipping, bainite isothermal within the scope of 450~480 DEG C Fringe time control is in 15~150s, and zinc liquid ingredient is containing 0.18%~0.50%Al, remaining is Zn and inevitable impurity Zinc liquid, is cooled to room temperature later.
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CN113528950A (en) * 2021-06-22 2021-10-22 首钢集团有限公司 Hot-dip galvanized high-strength steel with good welding performance and preparation method thereof
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CN110499465A (en) * 2019-09-02 2019-11-26 鞍钢股份有限公司 A kind of low-cost high-strength galvanized steel plain sheet and its manufacturing method
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CN111945075A (en) * 2020-09-07 2020-11-17 鞍钢股份有限公司 Alloying hot galvanizing DH590 steel with high hole expansion performance and preparation method thereof
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CN113403548B (en) * 2021-05-21 2022-08-16 鞍钢股份有限公司 1470 MPa-grade high-hole-expansion steel plate for cold stamping and preparation method thereof
CN113528950A (en) * 2021-06-22 2021-10-22 首钢集团有限公司 Hot-dip galvanized high-strength steel with good welding performance and preparation method thereof
CN113528950B (en) * 2021-06-22 2022-10-21 首钢集团有限公司 Preparation method of hot-dip galvanized high-strength steel with good welding performance

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