CN104831177B - A kind of cold-rolled galvanized duplex steel and preparation method thereof - Google Patents
A kind of cold-rolled galvanized duplex steel and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of cold-rolled galvanized duplex steel, its chemical component weight percentage is respectively：C：0.11 0.14%, Si：0.1 0.3%, Mn：1.2 1.5%, P：≤ 0.01%, S：≤ 0.01%, Al：0.03 0.07%, Cr：0.5 0.7%, Ti：0 0.03%, B≤0.005%, surplus Fe.A kind of preparation method of cold-rolled galvanized duplex steel is further related to, is comprised the following steps：Molten steel obtains continuous casting billet after converter smelting using continuous casting mode；Continuous casting billet obtains hot rolled plate by hot rolling, and hot rolled plate obtains chill strip through cold rolling；Chill strip handles to obtain cold-rolled galvanized duplex steel finished product by continuous zinc coating annealing process.The present invention makes cold-rolled galvanized duplex steel reduce cost of alloy on the basis of intensity requirement is met, while improves plasticity, and can adjust product yield tensile ratio as needed, meets different processability demands.
Description
Technical field
The present invention relates to steelmaking technical field, more particularly to a kind of cold-rolled galvanized duplex steel and preparation method thereof.
Background technology
Usual cold-rolled galvanized duplex steel needs to add due to improving quenching degree and improving the requirement of galvanizing surface quality
The member such as Cr, Mo usually substitutes the elements such as Si, Mn, and as the raising of the dual phase steel trade mark, alloying element content increase therewith.But
Mo element costs are higher, and with the increase of its content, the cost of alloy of cold-rolled galvanized duplex steel has been significantly greatly increased, and especially working as
Under preceding severe steel situation, larger pressure is brought for steel plant.
In addition, the difference of forming parts mode has different requirements to material property.Punch forming performance requires material tool
There is low yield tensile ratio, and flange bending and molding then requires higher yield tensile ratio.MA form in the species of alloying element, dual phase steel
And distribution, the selection of schedule of reinforcement be all by the mechanical property for directly affecting dual phase steel and its final punch forming performance, but it is existing
The production method of dual phase steel can not adjust product yield tensile ratio in technology, can not meet different processability demands.
The content of the invention
The embodiment of the present application provides a kind of cold-rolled galvanized duplex steel and preparation method thereof, solves or part solves
Steel-making cost height, preparation method can not adjust product yield tensile ratio in the prior art, can not meet the skill of different processability demands
Art problem, realize cold-rolled galvanized duplex steel reduces cost on the basis of intensity requirement is met, while improves dual phase steel
Plasticity, and product yield tensile ratio can be adjusted as needed, meet the technique effect of different processability demands.
A kind of chemical composition of cold-rolled galvanized duplex steel provided by the invention is as follows：Calculate by percentage to the quality, C：
0.11~0.14%, Si:0.1~0.3%, Mn：1.2~1.5%, P≤0.01%, S≤0.01%, Al：0.03~0.07%,
Cr：0.5~0.7%, Ti：0~0.03%, B≤0.005%, surplus are Fe and inevitable impurity.
Preferably, the tissue of the dual phase steel includes ferrite Ji Maao islands；
The parameter index of the dual phase steel includes：Tensile strength is more than 590MPa, yield tensile ratio value scope 0.58~0.65,
Gauge length 80mm elongation percentage scope 20.5~22.5%.
A kind of preparation method of cold-rolled galvanized duplex steel provided by the invention comprises the following steps：
Molten steel obtains continuous casting steel billet after converter smelting；The chemical composition of the continuous casting steel billet is as follows：With quality percentage
Than calculating, C：0.11~0.14%, Si:0.1~0.3%, Mn：1.2~1.5%, P≤0.01%, S≤0.01%, Al：0.03
~0.07%, Cr：0.5~0.7%, Ti：0~0.03%, B≤0.005%, surplus are Fe and inevitable impurity；
The continuous casting steel billet obtains hot rolled plate by hot rolling, and the hot rolled plate obtains chill strip through cold rolling；
The chill strip handles to obtain the cold-rolled galvanized duplex steel finished product by continuous zinc coating annealing process.
Preferably, the molten steel includes by the process control of converter smelting：
The End Aim Temperature of the converter smelting controls：Furnace temperature pours in first 1670~1690 DEG C of furnace temperature, company
1660~1680 DEG C；
Using Al-Fe alloy deoxidations；Mn-Fe alloys are added to add Mn elements；Low-carbon Cr-Fe alloys are added to add
Add Cr elements；
The lower quantity of slag≤80mm of the tapping process of the converter smelting, the time control of the tapping process is 4~8 points
Clock；Start the tapping process early stage to add slag former with steel stream, tap adds all slag making before reaching the 1/5 of total tap
Agent；
The RH-TOP refining target end temperature of the converter smelting：First 1565~1575 DEG C of stove, company pour stove 1560~
1570℃；The RH-TOP refining cycles 30~40 minutes.
Include preferably, the continuous casting steel billet obtains hot rolled plate by hot rolling：
The continuous casting steel billet heating and temperature control is 1210~1300 DEG C；
The hot rolling finishing temperature control is 850~890 DEG C；
The hot-rolling coiling temperature control is 600~680 DEG C.
Include preferably, the hot rolled plate obtains chill strip through cold rolling：
The cold rolling reduction ratio is 50%~75%.
Preferably, the chill strip handles to obtain the cold-rolled galvanized duplex steel by continuous zinc coating annealing process
Finished product includes：
The chill strip is preheated to 220 DEG C；
The temperature that chill strip after the preheating is reheated and is incubated is 760 DEG C~820 DEG C；
By the strip slow cooling after insulation to 680 DEG C~740 DEG C；
The strip after slow cooling is but cooled to zinc-plated temperature soon through height is hydrogen-cooled, the zinc-plated temperature control is 450~460
DEG C, galvanizing process terminates the rear strip and is cooled to 410~430 DEG C；
The strip is cold but through the laggard sector-style of the galvanizing process, and the temperature control of cooling tower top roller is 250~300
℃。
Cold-rolled galvanized duplex steel provided by the invention avoids the Mo elements of high cost by improving the contents of Cr elements
Add, the quenching degree of final cold rolling hot dip galvanized dual phase steel product is ensure that, by suitably reducing Si and Mn constituent contents, being fitted
Amount Al substitutes Si to meet the galvanizing quality requirement of the two-phase product made from steel；By the additions of Cr elements adjust MA forms and distribution come
The plasticity of the two-phase product made from steel is improved, improves its punch forming performance；By adding precipitation strength element ti in right amount, improve
The yield strength and yield tensile ratio of the two-phase product made from steel, while improve flange buckling performance.
Further, the preparation method of cold-rolled galvanized duplex steel provided by the invention in converter smelting by obtaining continuous casting
During slab, the addition of Cr elements is rationally improved, Cr elements promote transgranular MA generation in transgranular enrichment, and MA is normal
Comprising partially stabilized austenite, so as to reduce MA islands hardness, avoid MA islands and ferrite Interface Cracking in deformation process and
Improve plasticity so that two-phase product made from steel made of the preparation method has on the premise of meeting that tensile strength reaches standard requirement
Effect reduces yield tensile ratio, so as to have good punch forming performance.By rationally controlling the addition of Ti elements, because Ti is
Carbide, the enrichment of grain boundaries C element can be avoided, in the transgranular precipitation TiC of ferrite so as to reduce grain boundaries
Continuous N A generation so that MA is distributed more disperse, meanwhile, TiC precipitation strength effect makes dual phase steel made of the preparation method
The yield strength of product is improved, and yield tensile ratio rise, is advantageous to the processabilities such as flange bending.
Brief description of the drawings
Fig. 1 is the microstructure picture for the cold-rolled galvanized duplex steel that the embodiment of the present invention one provides.
Fig. 2 is the microstructure picture for the cold-rolled galvanized duplex steel that the embodiment of the present invention three provides.
Fig. 3 is the Ma Ao islands pattern being distributed in the experiment steel of the embodiment of the present invention one along crystal boundary.
Fig. 4 is the Ma Ao islands pattern in the experiment steel of the embodiment of the present invention one in the transgranular distribution of ferrite.
Fig. 5 is the precipitated phase tested in steel in ferrite of the embodiment of the present invention three.
Embodiment
The embodiment of the present application provides a kind of cold-rolled galvanized duplex steel and preparation method thereof, solves or part solves
Steel-making cost height, preparation method can not adjust product yield tensile ratio in the prior art, can not meet the skill of different processability demands
Art problem is appropriate to reduce Si and Mn constituent contents, be subject to appropriate Al replacement Si to meet this pair by improving the content of Cr elements
The galvanizing quality requirement of phase product made from steel, it is appropriate to add precipitation strength element ti, improve the two-phase product made from steel yield strength and
Yield tensile ratio, while flange buckling performance is improved, realize cold-rolled galvanized duplex steel reduces on the basis of intensity requirement is met
Cost, while the plasticity of dual phase steel is improved, and product yield tensile ratio can be adjusted as needed, meet different processability demands
Technique effect.
A kind of chemical composition of cold-rolled galvanized duplex steel provided by the invention is as follows：Calculate by percentage to the quality, C：
0.11~0.14%, Si:0.1~0.3%, Mn：1.2~1.5%, P≤0.01%, S≤0.01%, Al：0.03~0.07%,
Cr：0.5~0.7%, Ti：0~0.03%, B≤0.005%, surplus are Fe and inevitable impurity.
Further, the tissue of the dual phase steel includes ferrite Ji Maao islands；The parameter index of the dual phase steel includes：Tension
Intensity is more than 590MPa, yield tensile ratio value scope 0.58~0.65, gauge length 80mm elongation percentage scope 20.5~22.5%.
Wherein, the detailed description of the effect to each component of the dual phase steel is as follows, calculates by percentage to the quality：
C：0.11~0.14%, carbon can raise yield point and tensile strength, but cause plasticity and impact to reduce, and work as carbon amounts
During more than 0.23%, the welding performance of steel is degenerated, and thus be accordingly used in the low-alloy structural steel of welding, and phosphorus content is usually no more than
0.20%.
Si:0.1~0.3%, intensity, elasticity, heat-resisting, acid resistance of steel etc. can be increased, the proportion of steel and favourable can be reduced
In the improvement of intensity, but if excessively adding can make to generate a thickness, irregular high temperature oxide film on the surface of steel, greatly
The big ductility for reducing steel.
Mn：1.2~1.5%, Mn are used together the formation for helping to control carbide properties and austenite under high temperature with C.
The high temperature precipitations that can promote carbide coexist in particularly Mn and C, hot-short to limit so as to suppress formation of the carbide on crystal boundary
Property, ultimately help the improvement of hardness of steel.But dosage is excessive, band structure in Mn center segregation and hot rolled plate will occur
Surplus, cause ductility reduction.
P≤0.01%, is the element that a kind of addition should be as few as possible, and phosphorus solution strengthening and flow harden in steel act on
By force, added as alloying element in low-alloy structural steel, the atmospheric corrosion resistance of its intensity and steel can be improved, but it can be reduced
Cold stamping performance.
S≤0.01%, the content of sulphur and manganese is improved, the machinability energy of steel can be improved, sulphur is used as and had in automatic steel
Beneficial element adds.Sulphur is segregated the quality for seriously, deteriorating steel in steel.At high temperature, the plasticity of steel is reduced, is a kind of harmful member
Element, it exists in the form of the relatively low FeS of fusing point；The FeS of individualism fusing point only has 1190 DEG C, and is formed in steel with iron
Eutectiferous eutectic temperature is lower, only 988 DEG C, and when steel solidifies, iron sulfide analysis collection is in primary grain boundaries.Steel is in 1100-
1200 DEG C when being rolled, FeS on crystal boundary just will fusing, greatly weaken the adhesion between crystal grain, cause the heat of steel
Crisp phenomenon.
Al：0.03~0.07%, Al addition can reduce the proportion of steel, therefore its addition is 3% or more.Consider
The reduction of proportion, it is preferably added to substantial amounts of Al.If however, add excessive Al, intermetallic compound such as Kappa carbide,
FeAl or Fe3Al will increase so as to substantially reducing the ductility of steel.
Cr：0.5~0.7%, tissue is mainly made up of ferrite and MA islands, and Cr elements promote transgranular in transgranular enrichment
MA generation, MA often include partially stabilized austenite, so as to reduce MA islands hardness, avoid MA islands and iron element in deformation process
Body interface ftractures and improves plasticity.
Ti：0~0.03%, can be in the transgranular precipitation TiC of ferrite because Ti is carbide.TiC analysis
Go out, the enrichment of grain boundaries C element is avoided, so as to reduce grain boundaries continuous N A generation so that MA is distributed more disperse.In addition
TiC precipitation strength, which acts on, causes experiment steel yield strength to improve, and yield tensile ratio rise, this is for processabilities such as flange bendings
Favourable.
B≤0.005%, improving the effect of very competent 0.001%~0.003% boron of quenching degree can be respectively equivalent to
0.6% manganese, 0.7% chromium, 0.5% molybdenum and 1.5% nickel, therefore it improves the very capable of quenching degree, only needs very small amount boron
Save substantial amounts of expensive alloying elements.
A kind of preparation method of cold-rolled galvanized duplex steel provided by the invention comprises the following steps：
S1：Molten steel obtains continuous casting steel billet after converter smelting；The chemical composition of institute's continuous casting steel billet is as follows：With quality percentage
Than calculating, C：0.11~0.14%, Si:0.1~0.3%, Mn：1.2~1.5%, P≤0.01%, S≤0.01%, Al：0.03
~0.07%, Cr：0.5~0.7%, Ti：0~0.03%, B≤0.005%, surplus are Fe and inevitable impurity；
S2：Continuous casting steel billet obtains hot rolled plate by hot rolling, and hot rolled plate obtains chill strip through cold rolling；
S3：Chill strip handles to obtain cold-rolled galvanized duplex steel finished product by continuous zinc coating annealing process.
Further, molten steel includes by the process control of converter smelting：The End Aim Temperature of converter smelting controls：
1660~1680 DEG C of furnace temperature pours in first 1670~1690 DEG C of furnace temperature, company；Using Al-Fe alloy deoxidations；Add Mn-Fe alloys
To add Mn elements；Low-carbon Cr-Fe alloys are added to add Cr elements；The lower quantity of slag of the tapping process of converter smelting≤
80mm, the time control of tapping process is 4~8 minutes；Tapping process starts to add slag former with steel stream early stage, and tap reaches
All slag formers are added before the 1/5 of total tap；The RH-TOP refining target end temperature of converter smelting：First stove 1565~
1575 DEG C, 1560~1570 DEG C of stove pours in company；RH-TOP refining cycles 30~40 minutes.
Further, continuous casting steel billet obtains hot rolled plate by hot rolling and included：Continuous casting steel billet heating and temperature control be 1210~
1300℃；Hot rolling finishing temperature control is 850~890 DEG C；Hot-rolling coiling temperature control is 600~680 DEG C.
Further, hot rolled plate obtains chill strip through cold rolling includes：Cold rolling reduction ratio is 50%~75%.
Further, chill strip handles to obtain cold-rolled galvanized duplex steel finished product bag by continuous zinc coating annealing process
Include：Chill strip is preheated to 220 DEG C；The temperature that chill strip after preheating is reheated and is incubated is 760 DEG C~820 DEG C；
By the strip slow cooling after insulation to 680 DEG C~740 DEG C；By the strip after slow cooling through it is high it is hydrogen-cooled be but cooled to zinc-plated temperature soon, it is zinc-plated
Temperature control is 450~460 DEG C, and galvanizing process terminates rear strip and is cooled to 410~430 DEG C；Strip is carried out after galvanizing process
Air-cooled cooling, the temperature control of cooling tower top roller is 250~300 DEG C.
Technical scheme is described in detail with reference to the accompanying drawings and examples.
Embodiment one
Cold-rolled galvanized duplex steel that the present embodiment uses and preparation method thereof, comprises the following steps：
S1：Molten steel is passed through into converter smelting, continuous casting billet is obtained using continuous casting mode；
S2：Above-mentioned continuous casting billet is obtained into hot rolled plate by hot rolling, hot rolled plate further obtains chill strip through cold rolling；
S3：Above-mentioned chill strip is carried out into continuous zinc coating annealing process to handle to obtain finished product.
In smelting process：(1) converter smelting endpoint temperature is controlled：1660 DEG C of stove pours in first 1675 DEG C of stove, company；(2) use
Al-Fe deoxidations；Mn is matched somebody with somebody using Mn-Fe, Cr is matched somebody with somebody using Cr-Fe；The lower quantity of slag 80mm of tapping, taps 4 minutes time；Tapping process adds
Enter slag former, tapping begins to add slag charge, added with steel stream, all slag charges are added before tapping 1/5 early stage；(3) RH- is controlled
TOP refines end temp：1560 DEG C of stove pours in first 1569 DEG C of stove, company；RH-TOP refining cycles controlled by 35 minutes.Smelt and complete
Afterwards, the continuous casting billet chemical composition percentage of acquisition is respectively：C：0.117%, Si：0.18%, Mn：1.43%, P：0.01%, S：
0.004%, Al：0.046%, Cr：0.59%, B:0.0006%, surplus is Fe and impurity.
Technological parameter in course of hot rolling is：Preheating temperature is 220 DEG C, and heating-up temperature is 780 DEG C, soaking temperature 780
DEG C, slow cooling outlet temperature is 690 DEG C, and rapid cooling outlet temperature is 460 DEG C, and air knife is cooled to 420 DEG C, and the top roller temperature of cooling tower is
250 DEG C, the finishing elongation percentage of hot rolled plate is 0.3%, and straightening elongation percentage is 0.
The cold-rolled galvanized duplex steel mechanical property finally obtained：Tensile strength is 623.1MPa, and yield strength is
362.8MPa, gauge length are 22.3% in 80mm elongation percentage.
Embodiment two
Cold-rolled galvanized duplex steel that the present embodiment uses and preparation method thereof, comprises the following steps：
S1：Molten steel is passed through into converter smelting, continuous casting billet is obtained using continuous casting mode；
S2：Above-mentioned continuous casting billet is obtained into hot rolled plate by hot rolling, hot rolled plate further obtains chill strip through cold rolling；
S3：Above-mentioned chill strip is carried out into continuous zinc coating annealing process to handle to obtain finished product.
In smelting process：(1) converter smelting endpoint temperature is controlled：1660 DEG C of stove pours in first 1675 DEG C of stove, company；(2) use
Al-Fe deoxidations；Mn is matched somebody with somebody using Mn-Fe, Cr is matched somebody with somebody using Cr-Fe；The lower quantity of slag 80mm of tapping, taps 4 minutes time；Tapping process adds
Enter slag former, tapping begins to add slag charge, added with steel stream, all slag charges are added before tapping 1/5 early stage；(3) RH- is controlled
TOP refines end temp：1560 DEG C of stove pours in first 1569 DEG C of stove, company；RH-TOP refining cycles controlled by 35 minutes.Smelt and complete
Afterwards, the continuous casting billet chemical composition percentage of acquisition is respectively：C：0.123%, Si：0.19%, Mn：1.49%, P：0.01%, S：
0.004%, Al：0.049%, Cr：0.62%, B:0.0007%, surplus is Fe and impurity.
Technological parameter in course of hot rolling is：Preheating temperature is 220 DEG C, and heating-up temperature is 800 DEG C, soaking temperature 800
DEG C, slow cooling outlet temperature is 700 DEG C, and rapid cooling outlet temperature is 460 DEG C, and air knife is cooled to 420 DEG C, and the top roller temperature of cooling tower is
250 DEG C, the finishing elongation percentage of hot rolled plate is 0.3%, and straightening elongation percentage is 0.
The cold-rolled galvanized duplex steel mechanical property finally obtained：Tensile strength is 637.6MPa, and yield strength is
375.1MPa, gauge length are 21.8% in 80mm elongation percentage.
Embodiment three
Cold-rolled galvanized duplex steel that the present embodiment uses and preparation method thereof, comprises the following steps：
S1：Molten steel is passed through into converter smelting, continuous casting billet is obtained using continuous casting mode；
S2：Above-mentioned continuous casting billet is obtained into hot rolled plate by hot rolling, hot rolled plate further obtains chill strip through cold rolling；
S3：Above-mentioned chill strip is carried out into continuous zinc coating annealing process to handle to obtain finished product.
In smelting process：(1) converter smelting endpoint temperature is controlled：1680 DEG C of stove pours in first 1677 DEG C of stove, company；(2) use
Al-Fe deoxidations；Mn is matched somebody with somebody using Mn-Fe, Cr is matched somebody with somebody using Cr-Fe；The lower quantity of slag 60mm of tapping, taps 5 minutes time；Tapping process adds
Enter slag former, tapping begins to add slag charge, added with steel stream, all slag charges are added before tapping 1/5 early stage；(3) RH- is controlled
TOP refines end temp：1570 DEG C of stove pours in first 1568 DEG C of stove, company；RH-TOP refining cycles controlled by 34 minutes.Smelt and complete
Afterwards, the continuous casting billet chemical composition percentage of acquisition is respectively：C：0.129%, Si：0.18%, Mn：1.47%, P：0.01%, S：
0.004%, Al：0.048%, Cr：0.58%, Ti：0.028%, B:0.0006%, surplus is Fe and impurity.
Technological parameter in course of hot rolling is：Preheating temperature is 220 DEG C, and heating-up temperature is 780 DEG C, soaking temperature 780
DEG C, slow cooling outlet temperature is 690 DEG C, and rapid cooling outlet temperature is 460 DEG C, and air knife is cooled to 420 DEG C, and the top roller temperature of cooling tower is
250 DEG C, the finishing elongation percentage of hot rolled plate is 0.3%, and straightening elongation percentage is 0.
The cold-rolled galvanized duplex steel mechanical property finally obtained：Tensile strength is 635.7MPa, and yield strength is
413.5MPa, gauge length are 20.6% in 80mm elongation percentage.
Example IV
Cold-rolled galvanized duplex steel that the present embodiment uses and preparation method thereof, comprises the following steps：
S1：Molten steel is passed through into converter smelting, continuous casting billet is obtained using continuous casting mode；
S2：Above-mentioned continuous casting billet is obtained into hot rolled plate by hot rolling, hot rolled plate further obtains chill strip through cold rolling；
S3：Above-mentioned chill strip is carried out into continuous zinc coating annealing process to handle to obtain finished product.
In smelting process：(1) converter smelting endpoint temperature is controlled：1680 DEG C of stove pours in first 1679 DEG C of stove, company；(2) use
Al-Fe deoxidations；Mn is matched somebody with somebody using Mn-Fe, Cr is matched somebody with somebody using Cr-Fe；The lower quantity of slag 60mm of tapping, taps 5 minutes time；Tapping process adds
Enter slag former, tapping begins to add slag charge, added with steel stream, all slag charges are added before tapping 1/5 early stage；(3) RH- is controlled
TOP refines end temp：1570 DEG C of stove pours in first 1566 DEG C of stove, company；RH-TOP refining cycles controlled by 35 minutes.Smelt and complete
Afterwards, the continuous casting billet chemical composition percentage of acquisition is respectively：C：0.127%, Si：0.19%, Mn：1.41%, P：0.01%, S：
0.004%, Al：0.050%, Cr：0.55%, Ti：0.024%, B:0.0007%, surplus is Fe and impurity.
Technological parameter in course of hot rolling is：Preheating temperature is 220 DEG C, and heating-up temperature is 800 DEG C, soaking temperature 800
DEG C, slow cooling outlet temperature is 700 DEG C, and rapid cooling outlet temperature is 460 DEG C, and air knife is cooled to 420 DEG C, and the top roller temperature of cooling tower is
250 DEG C, the finishing elongation percentage of hot rolled plate is 0.3%, and straightening elongation percentage is 0.
The cold-rolled galvanized duplex steel mechanical property finally obtained：Tensile strength is 640.2MPa, and yield strength is
411.2MPa, gauge length are 20.9% in 80mm elongation percentage.
The continuous casting billet that embodiment one to four obtains is smelted in course of hot rolling：Continuous blank heating temperature is 1250 DEG C；Hot rolling is whole
Roll 870 DEG C of temperature；640 DEG C of hot-rolling coiling temperature.Hot rolling terminates, and the hot rolling plate thickness of acquisition is 4mm；Control in cold-rolled process
Cold rolling reduction ratio 50%~75%, cold rolling obtain the chill strip that thickness is 1.5mm after terminating.
Accompanying drawing 1 show the high Cr systems experiment steel that embodiment one is not added with Ti elements, lays particular stress on sulfurous using picric acid
Acid sodium solution corrodes, and wherein grey is ferrite matrix, and black is bainite structure, and brilliant white is horse (MA) island difficult to understand.It can see
Go out tissue to be mainly made up of ferrite Ji Maao islands.Other accompanying drawing 3, accompanying drawing 4 sets forth the Zhong Maao islands of embodiment one difference
In the pattern that crystal boundary and ferrite are transgranular, Cr elements promote the generation on transgranular Ma Ao islands, Ma Ao islands Chang Bao in transgranular enrichment
Containing partially stabilized austenite, so as to reduce Ma Ao islands hardness, deformation process Zhong Maao islands and ferrite Interface Cracking are avoided
And improve plasticity.Find out that its yield tensile ratio is relatively low from the performance of table 2, so as to have good punch forming performance.
Accompanying drawing 2 show embodiment three and adds the high Cr systems experiment steel after Ti elements, lays particular stress on sulfurous using picric acid
Acid sodium solution corrodes, and wherein grey is ferrite matrix, and black is bainite structure, and brilliant white is horse (MA) island difficult to understand.Due to Ti
, can be in the transgranular precipitation TiC of ferrite for carbide (shown in accompanying drawing 5).TiC precipitation, avoid grain boundaries C members
Element enrichment, so as to reduce the generation on the continuous Ma Ao islands of grain boundaries so that Ma Ao islands are distributed more disperse.Other TiC precipitation is strong
Change, which acts on, causes experiment steel yield strength to improve, and yield tensile ratio rise, this is favourable for processabilities such as flange bendings.
It can show that cold-rolled galvanized duplex steel product reaches made of the preparation method by above-mentioned 4 embodiments
The tensile strength requirement of 590MPa levels, meanwhile, this method can need to produce low yield strength ratio or high-yield-ratio according to processability
Cold-rolled galvanized duplex steel.
Cold-rolled galvanized duplex steel provided by the invention avoids the Mo elements of high cost by improving the contents of Cr elements
Add, the quenching degree of final cold rolling hot dip galvanized dual phase steel product is ensure that, by suitably reducing Si and Mn constituent contents, being fitted
Amount Al substitutes Si to meet the galvanizing quality requirement of the two-phase product made from steel；By the additions of Cr elements adjust MA forms and distribution come
The plasticity of the two-phase product made from steel is improved, improves its punch forming performance；By adding precipitation strength element ti in right amount, improve
The yield strength and yield tensile ratio of the two-phase product made from steel, while improve flange buckling performance.
Further, the preparation method of cold-rolled galvanized duplex steel provided by the invention in converter smelting by obtaining continuous casting
During slab, the addition of Cr elements is rationally improved, Cr elements promote transgranular MA generation in transgranular enrichment, and MA is normal
Comprising partially stabilized austenite, so as to reduce MA islands hardness, avoid MA islands and ferrite Interface Cracking in deformation process and
Improve plasticity so that high Cr made of the preparation method is meeting tensile strength without Mo low cost cold-rolled galvanized duplex steel products
On the premise of reaching standard requirement, yield tensile ratio is effectively reduced, so as to have good punch forming performance.By rationally controlling
The addition of Ti elements, because Ti is carbide, grain boundaries C members can be avoided in the transgranular precipitation TiC of ferrite
Element enrichment, so as to reduce grain boundaries continuous N A generation so that MA is distributed more disperse, meanwhile, TiC precipitation strength effect makes
The yield strength of two-phase product made from steel is improved made of the preparation method, yield tensile ratio rise, is advantageous to the shaping such as flange bending
Performance.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not limited to this hair
It is bright, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., it should be included in the present invention
Protection domain within.
Claims (2)
- A kind of 1. cold-rolled galvanized duplex steel, it is characterised in that：The chemical composition of the dual phase steel is as follows：Calculate by percentage to the quality, C：0.117~0.14%, Si:0.1~0.3%, Mn：1.2~1.5%, P≤0.01%, S≤0.01%, Al：0.03~0.07%, Cr：0.55~0.7%, Ti：0.024~ 0.03%th, B≤0.005%, surplus are Fe and inevitable impurity；The tissue of the dual phase steel includes ferrite Ji Maao islands；The parameter index of the dual phase steel includes：Tensile strength is more than 590MPa, and yield tensile ratio value scope is 0.58~0.65, gauge length 80mm elongation percentage scope 20.5~22.5%.
- 2. a kind of preparation method of cold-rolled galvanized duplex steel, it is characterised in that comprise the following steps：Molten steel obtains continuous casting steel billet after converter smelting；The chemical composition of the continuous casting steel billet is as follows：By percentage to the quality Calculate, C：0.117~0.14%, Si:0.1~0.3%, Mn：1.2~1.5%, P≤0.01%, S≤0.01%, Al：0.03~ 0.07%th, Cr：0.55~0.7%, Ti：0.024~0.03%, B≤0.005%, surplus are Fe and inevitable impurity；Institute State converter smelting End Aim Temperature control be：1660~1680 DEG C of furnace temperature pours in first 1670~1690 DEG C of furnace temperature, company； The molten steel includes by the process control of converter smelting：Using Al-Fe alloy deoxidations；Mn-Fe alloys are added to add Mn Element；Low-carbon Cr-Fe alloys are added to add Cr elements；The lower quantity of slag≤80mm of the tapping process of the converter smelting, institute The time control for stating tapping process is 4~8 minutes；Start the tapping process early stage to add slag former with steel stream, tap reaches All slag formers are added before to the 1/5 of total tap；The RH-TOP refining target end temperature of the converter smelting：First stove 1565~1575 DEG C, 1560~1570 DEG C of stove pours in company；The RH-TOP refining cycles 30~40 minutes；The continuous casting steel billet obtains hot rolled plate by hot rolling, and the continuous casting steel billet heating and temperature control is 1210~1300 DEG C；Institute It is 850~890 DEG C to state hot rolling finishing temperature control；The hot rolled plate obtains chill strip through cold rolling；The cold rolling reduction ratio is 50%~75%；The hot-rolling coiling temperature control is 600~680 DEG C；The chill strip handles to obtain the cold-rolled galvanized duplex steel finished product by continuous zinc coating annealing process；Wherein, institute Stating the processing of continuous zinc coating annealing process includes：The chill strip is preheated to 220 DEG C；The temperature that chill strip after the preheating is reheated and is incubated is 760 DEG C~820 DEG C；By the strip slow cooling after insulation to 680 DEG C~740 DEG C；The strip after slow cooling is but cooled to zinc-plated temperature soon through height is hydrogen-cooled, the zinc-plated temperature control is 450~460 DEG C, Galvanizing process terminates the rear strip and is cooled to 410~430 DEG C；The strip is cold but through the laggard sector-style of the galvanizing process, The temperature control of cooling tower top roller is 250~300 DEG C.
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| CN106086638B (en) * | 2016-06-17 | 2018-08-21 | 首钢集团有限公司 | A kind of Galvanized Dual Phase Steel and its production method |
| CN107058895A (en) * | 2016-12-23 | 2017-08-18 | 首钢总公司 | A kind of 1000MPa grades of hot dip galvanized dual phase steel and preparation method thereof |
| CN108486501B (en) * | 2018-05-15 | 2020-07-24 | 首钢集团有限公司 | 1000 MPa-grade cold-rolled hot-galvanized dual-phase steel with enhanced plasticity and manufacturing method thereof |
| CN109023106A (en) * | 2018-09-25 | 2018-12-18 | 首钢集团有限公司 | A kind of cold rolling hot dip galvanizing Multiphase Steel and preparation method thereof |
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| CN110093491B (en) * | 2019-05-17 | 2020-12-22 | 中冶赛迪工程技术股份有限公司 | Cold-rolled hot-galvanized dual-phase steel and manufacturing method thereof |
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| CN112658031A (en) * | 2020-12-10 | 2021-04-16 | 华菱安赛乐米塔尔汽车板有限公司 | Control method for improving edge forming of cold-rolled hot-galvanized high-strength dual-phase steel |
| CN113957221B (en) * | 2021-10-21 | 2023-11-24 | 山东钢铁集团日照有限公司 | Preparation method and application of DP980 chilled steel strip |
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