CN109576591A - A kind of 700MPa grades of cold rolling is anti-corrosion dual phase steel and its manufacturing method - Google Patents

A kind of 700MPa grades of cold rolling is anti-corrosion dual phase steel and its manufacturing method Download PDF

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CN109576591A
CN109576591A CN201910110914.6A CN201910110914A CN109576591A CN 109576591 A CN109576591 A CN 109576591A CN 201910110914 A CN201910110914 A CN 201910110914A CN 109576591 A CN109576591 A CN 109576591A
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steel
rolling
cold
corrosion
dual phase
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CN109576591B (en
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刘志伟
孙傲
张瑞琦
郭晓宏
杨玉
金星
景鹤
孙荣生
王静
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Angang Steel Co Ltd
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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
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • 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
    • 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
    • C21D8/0236—Cold 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • 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
    • 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
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

Abstract

A kind of 700MPa grades of cold rolling of the present invention is anti-corrosion dual phase steel and its manufacturing method.Contain C:0.080%~0.095% in steel, Si < 0.10%, Mn:1.41%~1.69%, P≤0.018%, S≤0.006%, Als:0.015%~0.045%, Cr:0.51%~0.99%, Ni:0.11%~0.19%, Cu:0.29%~0.46%, Nb:0.031%~0.049%, Ti:0.017%~0.042%, Sb:0.051%~0.119%, Sn:0.037%~0.089%, Mo:0.11%~0.19%, B:0.0008%~0.0019%, Ca:0.0008%~0.0030%；Surplus is iron and inevitable impurity；135~170mm heating of plate blank is to 1228~1249 DEG C, 1100 DEG C of roughing temperature >, and 905~945 DEG C of finish to gauges, 815~845 DEG C of annealing, 350~380 DEG C of tempering, the resistance to sulfuric acid of steel plate and chloride ion corrosion are had excellent performance.

Description

A kind of 700MPa grades of cold rolling is anti-corrosion dual phase steel and its manufacturing method
Technical field
The invention belongs to high strength cold-rolled dual phase steel production technical fields, in particular to a kind of to be used for rolling stock, packaging Case etc. has corrosion proof cold-rolled biphase steel and its manufacturing method.
Background technique
For transport structure, there is an urgent need to the containers of lightweight to increase the transportable goods weight of single, such as The materials such as stainless steel or aluminium alloy by the container of manufacture lightweight or rolling stock and extend the service life.But since they produce Higher cost, and then application is subject to certain restrictions.And existing cold-rolled steel sheet, corrosion resistance cannot fully meet use again and want It asks.In order to adapt to the thinned demand of steel plate, develop yield strength 700MPa and its more than superhigh intensity cold rolling corrosion resistant plate get over The favor by user is got over, the steel plate of this rank can effectively reduce steel consumption to reduce manufacturing cost.
Chinese patent CN 105063510B discloses a kind of high-ductility 700MPa cold rolling weather resisting dual phase steel and its preparation side Method, this method manufacture cold rolling weather resisting dual phase steel chemical component be C:0.07%~0.15%, Si:0.30%~0.80%, Mn:1.40%~1.70%, P < 0.01%, S < 0.01%, Cr:0.40%~0.60%, Cu:0.20%~0.30%, Ni: 0.15%~0.30%, Nb:0.02%~0.05%, Ti:0.02%~0.05%, remaining for Fe and it is other inevitably it is miscellaneous Matter.The yield strength of steel plate is 328~346MPa, and corrosion resistance does not reach requirement.
Chinese patent CN101553586A discloses formable high strength cold-rolled steel sheet and its system with excellent weather resistance Make method.Its chemical component are as follows: C:0.10%~0.20%, Si:0.05%~0.25%, Mn:1.0%~2.5%, P≤ 0.020%, S≤0.010%, Al:0.02%~0.07%, Nb:0.02%~0.08%, Ni:0.05%~0.30%, Cu: The iron of 0.1%~0.5%, Cr:0.8%~1.5%, Co:0.01%~0.10% and surplus and it is other inevitably it is miscellaneous Matter.Technology disclosed in the document is reheated in 1150~1300 DEG C, 750~930 DEG C of final rolling temperature hot rolling, 400~650 DEG C of volumes It takes, in (+30 DEG C of A1 transition point)~(A3 transition point or following) continuous annealing.The steel yield strength maximum of the technology is in 500MPa Below.
Chinese patent CN101376950A discloses a kind of superhigh intensity cold rolling weather resisting steel plate and its manufacturing method.Its chemistry Ingredient are as follows: C:0.09%~0.16%, Si:0.20%~0.60%, Mn:1.00%~2.00%, P≤0.030%, S≤ 0.015%, N≤0.008%, Al:0.02%~0.06%, Cu:0.20%~0.40%, Cr:0.40%~0.60%, Mo: 0.05%~0.25%, (Nb+Ti): 0.04%~0.08%, other is Fe and inevitable magazine.The steel of the technology is bent Take 700~1000MPa of intensity, 800~1070MPa of tensile strength, elongation percentage 5%~14%.Although the invention intensity reaches 700MPa or more, but corrosion resistance can be met the requirements.
Chinese patent CN102011060A discloses a kind of 700MPa grades of cold-rolled steel sheet and its system with excellent weather resistance Make method.Its chemical component are as follows: C:0.03%~0.07%, Si≤0.35%, Mn:0.1%~1.8%, P≤0.020%, S ≤ 0.010%, Cu:0.25%~0.50%, Cr:0.25%~0.80%, Ni:0.05%~0.30%, Ti:0.06%~ 0.20%, it is other remaining for Fe and inevitable impurity.Temperature range of the technology disclosed in the document in 500 DEG C~A1 transition point The steel are inside made to anneal in bell type annealing furnace.This technology is suitable only for small lot production, it is difficult to meet mass production Demand, and the uniformity of coil of strip entire volume is not easy to guarantee.
Perhaps intensity and corrosion resistance are not achieved requirement or are unsuitable for high-volume in patent disclosed above Production.
Summary of the invention
For presently, there are the technical issues of, the technical solution that the present invention is specifically proposed.The purpose of the present invention is to provide one Kind yield strength 700MPa cold rolling is anti-corrosion dual phase steel and its manufacturing method, to solve the above-mentioned problems in the prior art.Steel Plate not only has good atmospheric corrosion resistance, but also has excellent medium corrosion resistance energy, in 20%H2SO4+ 3.5% Solution is changed without in NaCl solution for 24 hours under immersion corrosion experimental condition, relative to Q345B corrosion rate less than 4%, except this it Outside, steel plate also has superhigh intensity and excellent processability, and the lightweight development for being suitable for rolling stock and container etc. needs It asks.
Specific technical solution is:
The present invention proposes a kind of anti-corrosion dual phase steel of 700MPa grades of cold rolling, and chemical component is as follows by mass percentage: C: 0.080%~0.095%, Si < 0.10%, Mn:1.41%~1.69%, P≤0.018%, S≤0.006%, Als: 0.015%~0.045%, Cr:0.51%~0.99%, Ni:0.11%~0.19%, Cu:0.29%~0.46%, Nb: 0.031%~0.049%, Ti:0.017%~0.042%, Sb:0.051%~0.119%, Sn:0.037%~0.089%, Mo:0.11%~0.19%, B:0.0008%~0.0019%, Ca:0.0008%~0.0030%, remaining is Fe and can not keep away Exempt from element.
The mechanism of action of element in steel are as follows:
C: being main intensified element in steel, can significantly improve the intensity of steel plate, but the C of more content welds steel plate Property, toughness and plasticity are unfavorable.Low C, which is designed, to be to limit the formation of pearlitic structrure and other carbide, guarantees the micro- of steel Structure is equal phase constitution, avoids electrochemical corrosion caused by the potential difference between out-phase, improves the corrosion resisting property of steel, this hair Bright middle C content control is 0.080%~0.095%.
Si:Si solid solubility with higher in steel has preferable solution strengthening effect, but its too high levels can make steel Plasticity reduces, welding performance and surface quality decline.The control of Si content is Si < 0.10% in the present invention.
Mn: belonging to typical austenite stabilizer element, has solution strengthening and Grain Refinement Effect, to raising harden ability Favorably, perlitic transformation and bainite transformation can significantly be postponed.But Mn is as the element for expanding austenitic area, when manganese content mistake Greatly, while postponing perlitic transformation, ferritic precipitation can be also postponed, while increasing the center segregation tendency of continuous casting billet, Mn content is controlled 1.41%~1.69% in the present invention.
P: can effectively improve the atmospheric corrosion resistance of steel, but phosphorus is easy to be segregated, increase the cold brittleness of steel, to weldability and Mouldability is unfavorable.To guarantee welding performance and processability requirement, P content is controlled it in the present invention and is not higher than 0.018%.
S: being harmful element in steel, and steel is made to generate red brittleness, reduces the ductility and toughness of steel, deteriorates welding performance, together When S presence will deteriorate the atmospheric corrosion resistance of steel, S content is controlled it not higher than 0.006% in the present invention.
Als: being common deoxidier, and 0.015%~0.045% aluminium is added in steel, can refine crystal grain.
Cr, Ni, Cu: three kinds of elements are added in steel simultaneously has good effect to atmospheric corrosion resistance is improved.Steel plate In corrosion process, the enrichment of element such as Cu, Cr, Ni in the rusty scale of matrix, formed it is fine and close, close to amorphous stabilization Rusty scale.Ni can also significantly improve the low-temperature flexibility of steel simultaneously, increase substantially substrate and Low Temperature Impact Toughness of Heat-affected Zone. The weight ratio of Ni/Cu is 1/2 or more, can effectively prevent steel containing Cu due to check crack caused by hot-short.By the content of Cr in the present invention Control is 0.51%~0.99%, by the content control of Ni 0.11%~0.19%, by the content control of Cu 0.29%~ 0.46%.
Nb: both can be improved the recrystallization temperature of austenite, carry out controlled rolling in higher temperature, reduce milling train Load, while austenite can be reduced again to ferrite transformation temperature, promote the formation of low-carbon bainite or acicular ferrite, change The performance of kind steel.Nb also improves the intensity of steel by precipitation strength.The range of Nb content of the invention be 0.031%~ 0.049%.
Ti: being important V-N steel element in the present invention, not only can effectively refine outside crystal grain, and energy and C Tiny carbide and nitride or carbonitride are formed with N, there is very high precipitation enhancement, steel can be significantly increased The intensity of plate.Ti content is controlled 0.017%~0.042% in the present invention.
Sb, Sn:Sb and Sn element are constantly enriched in steel usually as harmful element, severely impact the quality of steel. Sb and Sn is to improve corrosion proof effective element in the present invention, and by the compound addition of Sb, Sn and Cr, collaboration is rich in rusty scale Collection, and form one layer of fine and close dense oxidation film rich in elements such as Sb, Sn, Cr higher than several times of matrix, significantly obstruction etch Property the ion transmission and corrosive environment that coexists of more resistance to sulfate radical and chloride ion.In order to ensure obtaining required corrosion resistance It can, it is necessary to play the common effect of three elements.Ti and Sb attracts each other simultaneously, when in Ti segregation to crystal boundary, also drags Sb It drags on crystal boundary, so that Sb is precipitated with tiny second phase particles, rather than field trash form is precipitated, and particle size is in 10~30nm Between, to improve the intensity of steel plate.Sb is acid to resistance to sulfuric acid, salt tolerant and the resistance to sour corrosion containing chloride is effective Fruit, the Sb amount the how then resistance to sulfuric acid higher, but can reduce to the toughness of hot-workability, steel plate and welding point.Therefore, originally The content of Sn 0.051%~0.119%, is controlled the content control of Sb 0.037%~0.089% by invention.
Mo: MoO is generated in aqueous solution4 2-Ion, to inhibit chloride permeability, so as to improve the corrosion resistance of antifreezing agent, together When be formed by austenite harden ability with desirable influence, to the inhibiting effect of perlitic transformation to when improving critical zone heating Clearly, but it is a large amount of containing being deteriorated sometimes to the corrosion resistance of sulfuric acid, inhibit chloride ion effect unobvious when a small amount of, considers simultaneously The increase of cost.The content of Mo is controlled 0.11%~0.19% in the present invention.
B: in the corrosion-resistant element of the low melting point containing Sb, Cu, Sn, a certain amount of B, which is added, can play inhibition hot-working Property be deteriorated effect, while improve critical zone heating when formed austenite harden ability.When less than 0.0008%, it is unable to get foot Enough effects, if it exceeds 0.0019%, there is the tendency of hot-working variation instead.Therefore, when addition, make content range 0.0008%~0.0019% is desired.
Ca: making sulfide nodularization, may further ensure that the lateral extensibility of steel plate improves, improves cold roll forming performance. Ca processing is carried out after refining, Ca content has the function that 0.0008% can play nodularization sulfide, excessive Ca meeting Make sulfide coarsening, cause ductility reduction, therefore the present invention limits the upper limit of Ca content as 0.0030%, by Ca content control System is 0.0008%~0.0030%.
Another aspect of the present invention provides the manufacturing method of the anti-corrosion dual phase steel of 700MPa grades of cold rolling, and the method includes plates Base smelting continuous casting, heating, hot continuous rolling, cooling, batches, is pickling cold continuous rolling, annealing, smooth, and specific production method includes:
(1) smelt continuous casting process: molten iron pretreatment, converter smelting-is through top blast or top bottom blowing, at LF furnace desulfurization To control inclusion morphology and improve the ductility and cold-bending property of steel, continuous casting is using electromagnetic agitation and moves for reason and progress Calcium treatment State slighter compress, to improve the quality of continuous casting steel billet.Converter procedure is added by the way of antimony slab after tapping, is stirred using argon gas Mix, be completely melt alloy, ingredient it is uniform.Continuous casting billet with a thickness of 135~170mm, hence it is evident that be thinner than lead at present it is to be applied The thick continuous casting billet of 200mm or more, solidification cooling rate are far longer than traditional heavy slab, and secondary dendrite spacing significantly subtracts It is small.
(2) hot continuous rolling process: slab is not offline after continuous casting, directly into heating stove heating, guarantees slab charging temperature 800 DEG C or more, 1228~1249 DEG C of heating temperature, it is reducing atmosphere that steel atmosphere is burnt in heating, and air-fuel ratio is lower than 2.0.It is short using high temperature When burn steel technology, guarantee that hot material bringing-up section and soaking zone time inside furnace are not more than 110min, with prevent low melting point element Cu, Sb and Sn belt steel surface precipitation and caused by surface defect so that steel slab surface low melting point Cu, Sb and Sn generate it is subtle lack Falling into can be fully oxidized, and formation is loose easily to remove iron scale, to improve strip surface quality.It is being higher than 1100 DEG C of temperature range Interior carry out roughing, strip do not allow to swing, and in 1045~1090 DEG C of beginning finish rolling, finish rolling start rolling temperature is higher than 1090 DEG C, finished product Crystal grain is not easy to refine, and refined crystalline strengthening effect is bad；Lower than 1045 DEG C, tail part of band steel cooling is fast, increases the load of finishing rolling mill, holds Easily lead to accident；It is rolled in 905~945 DEG C of end, it can be to avoid keeping mill load excessive.It is cold that laminar flow is carried out after rolling But, batch.Coiling temperature is set in 581~637 DEG C, and laminar flow concentrates cooling using leading portion.
(3) cold-rolling process: the hot rolled plate is used into 5 rack continuous rollings after overpickling, cold rolling reduction ratio is 50% ~70%.
(4) annealing process: continuous annealing uses 815~845 DEG C of 112~160s of heat preservation, and with 4~9 DEG C/s speed jet 685~700 DEG C are cooled to, is then cooled to 220~250 DEG C with the cooling rate jet of 41~59 DEG C/s, then it is heated to 350~ 380 DEG C of tempering 310~510s, it is smooth using 0.9%~1.3%.
The cold rolling that the present invention produces according to the method described above is anti-corrosion dual phase steel, steel plate yield strength reach 700MPa or more, resist Tensile strength reaches 800MPa or more, elongation percentage (A50mm) it is not less than 10%.Product microstructure is that ferrite adds martensite two-phase Tissue, is in addition also dispersed with a certain amount of alloyed cementite on ferrite matrix.In conventional hot rolling and cold-rolling process condition Under, being quickly cooled down two stage continuous annealing annealing way using Slow cooling cooperation can produce, and not need with water quenching ability Continuous annealing apparatus.According to TB/T2375-93, at 45 ± 2 DEG C, 70% ± 5%RH, in 0.01mol/LNaHSO3In solution Under the conditions of testing 72h, relative to Q345B corrosion rate less than 55%.According to JB/T 7901-1999, at room temperature, 20% H2SO4It is soaked entirely in+3.5%NaCl solution for 24 hours, relative to Q345B corrosion rate less than 4%.Suitable for rolling stock and container Etc. industries lightweight growth requirement, greatly reduce maintenance cost, with good application prospect.
The utility model has the advantages that
The present invention compared with the existing technology, has the beneficial effect that:
(1) it is added simultaneously using a variety of alloying elements, especially the synergistic effect of Cr, Cu, Sb and Sn, there are also Nb, Ti, Mo Achieved the effect that high-intensitive and anti-corrosion with the booster action of the elements such as B by a small amount of polynary effect of alloying element.
(2) using continuous casting steel billet with a thickness of 135~170mm, using short route casting and rolling process, using high temperature, short time Fast-firing technique, it is high-efficient, save the energy, it is ensured that steel of the present invention has good surface quality.The dedicated production of high-strength steel is not needed Line is readily produced.
(3) steel plate not only has good atmospheric corrosion resistance, but also has excellent medium corrosion resistance energy.By this The 700MPa grade cold rolling corrosion resistant plate for inventing production, relative to weathering steel currently in use, atmospheric corrosion resistance and its Quite, but medium corrosion resistance can significantly improve, and steel of the invention can be widely applied to the system of rolling stock and container etc. It makes, is conducive to promote and apply.
(4) steel plate thickness specification is 1.0~2.0mm, and the microstructure of steel plate is made of ferrite+martensite, by area Percentages: ferrite is 61%~67%, and martensite is 33%~39%.
Specific embodiment
For following embodiment for illustrating the content of present invention, these embodiments are only the general description of the content of present invention, The content of present invention is not limited.
The chemical component of steel of the embodiment of the present invention is shown in Table 1, and the rolling mill practice of steel of the embodiment of the present invention is shown in Table 2, and the present invention is real It applies Heat-Treatment of Steel technique and is shown in Table 3, the mechanical property of steel of the embodiment of the present invention is shown in Table 4.On the steel plate of Examples 1 to 10, The sample of 50 × 50 × 5mm is intercepted, test method is referring to " the railway weathering steel alternate-immersion test side TB/T 2375-93 Method " standard carries out period soaking corrosion test, and test period 72h, the atmospheric corrosion resistance of steel embodiment of the present invention the results are shown in Table 5； On the steel plate of Examples 1 to 10, the sample of 50 × 25 × 5mm is intercepted, test method is referring to JB/T 7901-1999 " metal material Expect laboratory homogeneous corrosion total immersion test method " standard progress 20%H2SO4The soak test of+3.5%NaCl, test period For 24 hours, the resistance to 20%H of steel embodiment of the present invention2SO4+ 3.5%NaCl corrosion test result is shown in Table 6.
The chemical component (wt%) of the steel embodiment of the present invention of table 1
The rolling mill practice of 2 steel of the embodiment of the present invention of table
The continuous annealing process of 3 steel of the embodiment of the present invention of table
The mechanical property of 4 steel of the embodiment of the present invention of table
Note: F --- ferrite, M --- martensite.
5 steel atmospheric corrosion resistance test result of the embodiment of the present invention of table
Steel grade Relatively corrosive rate/%
Embodiment 1 52
Embodiment 2 51
Embodiment 3 54
Embodiment 4 52
Embodiment 5 54
Embodiment 6 53
Embodiment 7 50
Embodiment 8 53
Embodiment 9 51
Embodiment 10 54
Q700NQR1 52
Q345B 100
Note: straight carbon steel Q345B and high-strength weathering steel Q700NQR1 is contrast sample.
The 6 resistance to 20%H of steel of the embodiment of the present invention of table2SO4+ 3.5%NaCl corrosion test result
Steel grade Relatively corrosive rate/%
Embodiment 1 2.37
Embodiment 2 2.48
Embodiment 3 3.26
Embodiment 4 2.18
Embodiment 5 3.07
Embodiment 6 2.98
Embodiment 7 3.16
Embodiment 8 2.15
Embodiment 9 2.29
Embodiment 10 3.09
Q700NQR1 14.3
Q345B 100
Note: straight carbon steel Q345B and high-strength weathering steel Q700NQR1 is contrast sample.
By table 1~6 as it can be seen that the corrosion-resisting steel produced using technical solution of the present invention, yield strength reaches 700MPa or more, resistance to Atmospheric corrosion performance is suitable with existing high-strength weathering steel Q700NQR1, resistance to SO42-+Cl-Corrosive effect is substantially better than existing high-strength resistance to Steel and straight carbon steel Q345B are waited, not only there is good atmospheric corrosion resistance, but also has excellent resistance to sulfuric acid and chloride ion total Corrosive nature under dis environment, meanwhile, steel plate also has high-intensitive, excellent processability, is suitable for rolling stock and packaging The manufacture such as case.

Claims (4)

1. a kind of anti-corrosion dual phase steel of 700MPa grades of cold rolling, which is characterized in that chemical component is by mass percentage in steel are as follows: C: 0.080%~0.095%, Si < 0.10%, Mn:1.41%~1.69%, P≤0.018%, S≤0.006%, Als: 0.015%~0.045%, Cr:0.51%~0.99%, Ni:0.11%~0.19%, Cu:0.29%~0.46%, Nb: 0.031%~0.049%, Ti:0.017%~0.042%, Sb:0.051%~0.119%, Sn:0.037%~0.089%, Mo:0.11%~0.19%, B:0.0008%~0.0019%, Ca:0.0008%~0.0030%, surplus are iron and can not keep away The impurity exempted from.
2. the anti-corrosion dual phase steel of 700MPa grades of cold rolling according to claim 1, which is characterized in that steel plate thickness be 1.0~ 2.0mm。
3. a kind of manufacturing method of the anti-corrosion dual phase steel of 700MPa as claimed in claim 1 or 2 grades of cold rollings, the production technology of steel plate Are as follows: slab smelting continuous casting, heating, hot continuous rolling, cooling, batches, is pickling cold continuous rolling, annealing, smooth, it is characterised in that:
(1) continuous casting process is smelted: through molten iron pretreatment, converter smelting, LF furnace desulfurization process and Calcium treatment；Continuous casting is stirred using electromagnetism It mixes or dynamic soft-reduction, converter procedure is added by the way of antimony slab after tapping, is stirred using argon gas；The thickness of continuous casting billet For 135~170mm；
(2) rolling mill practice: for the heated stove heating of continuous casting steel billet to 1228~1249 DEG C, it is reducing atmosphere that steel atmosphere is burnt in heating, Air-fuel ratio is lower than 2.0；Hot material bringing-up section and soaking zone time inside furnace are not more than 110min；
Roughing temperature is higher than 1100 DEG C, and finish rolling start rolling temperature is 1045~1090 DEG C, and finish rolling finishing temperature is 905~945 DEG C, rolls Section cooling is carried out after system, is batched, and for oiler temperature control at 581~637 DEG C, laminar flow concentrates cooling using leading portion；
(3) cold-rolling process: cold rolling reduction ratio is 50%~70%；
(4) annealing process: continuous annealing temperature is 815~845 DEG C, keeps the temperature 112~160s, and be cooled to 4~9 DEG C/s speed 685~700 DEG C, 220~250 DEG C then are cooled to the cooling rate of 41~59 DEG C/s, is then heated to 350~380 DEG C of tempering 310~510s, it is smooth using 0.9%~1.3%.
4. the manufacturing method of the anti-corrosion dual phase steel of 700MPa grades of cold rolling according to claim 1 or 3, which is characterized in that steel plate Microstructure is ferrite and martensite, by area percentage: ferrite is 61%~67%, martensite for 33%~ 39%.
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110343829A (en) * 2019-08-06 2019-10-18 北京首钢冷轧薄板有限公司 A kind of technique that cold rolling produces yield strength 700MPa grades of dual phase steel
CN111424211A (en) * 2020-04-30 2020-07-17 鞍钢股份有限公司 Weather-resistant steel for wide 700 MPa-grade hot-rolled container and manufacturing method thereof
CN112662856A (en) * 2020-12-04 2021-04-16 安阳钢铁股份有限公司 Production method of cold-rolled acid-resistant steel 09CrCuSb
CN112831726A (en) * 2021-01-06 2021-05-25 鞍钢股份有限公司 Coating-free high-carbon high-strength corrosion-resistant electromagnetic steel plate and production method thereof
CN114737116A (en) * 2022-03-30 2022-07-12 鞍钢股份有限公司 700 MPa-grade wear-resistant corrosion-resistant steel and manufacturing method thereof
CN115135797A (en) * 2019-12-19 2022-09-30 Posco公司 Steel sheet having excellent wear resistance and composite corrosion resistance, and method for producing same

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007284783A (en) * 2006-03-20 2007-11-01 Nippon Steel Corp High strength cold rolled steel sheet and its production method
CN101942603A (en) * 2010-09-28 2011-01-12 北京科技大学 600MPa-level ultra-low silicon cold rolling hot galvanizing dual-phase steel and preparation process thereof
CN102471852A (en) * 2009-07-28 2012-05-23 杰富意钢铁株式会社 High-strength cold-rolled steel sheet and method for producing same
CN104419878A (en) * 2013-09-05 2015-03-18 鞍钢股份有限公司 Ultrahigh-strength cold rolled dual-phase steel with weatherability and manufacturing method of ultrahigh-strength cold rolled dual-phase steel
CN104471092A (en) * 2012-03-09 2015-03-25 新日铁住金不锈钢株式会社 Ferrite-austenite 2-phase stainless steel plate having low in-plane anisotropy and method for producing same
CN107130191A (en) * 2017-03-29 2017-09-05 江苏省沙钢钢铁研究院有限公司 A kind of low yield strength ratio air cooling dual phase steel of ferrite and bainite plate and its production method
CN109112433A (en) * 2017-06-26 2019-01-01 鞍钢股份有限公司 Without 590MPa grades of cold-rolled biphase steels of striated surface defect and production method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007284783A (en) * 2006-03-20 2007-11-01 Nippon Steel Corp High strength cold rolled steel sheet and its production method
CN102471852A (en) * 2009-07-28 2012-05-23 杰富意钢铁株式会社 High-strength cold-rolled steel sheet and method for producing same
CN101942603A (en) * 2010-09-28 2011-01-12 北京科技大学 600MPa-level ultra-low silicon cold rolling hot galvanizing dual-phase steel and preparation process thereof
CN104471092A (en) * 2012-03-09 2015-03-25 新日铁住金不锈钢株式会社 Ferrite-austenite 2-phase stainless steel plate having low in-plane anisotropy and method for producing same
CN104419878A (en) * 2013-09-05 2015-03-18 鞍钢股份有限公司 Ultrahigh-strength cold rolled dual-phase steel with weatherability and manufacturing method of ultrahigh-strength cold rolled dual-phase steel
CN107130191A (en) * 2017-03-29 2017-09-05 江苏省沙钢钢铁研究院有限公司 A kind of low yield strength ratio air cooling dual phase steel of ferrite and bainite plate and its production method
CN109112433A (en) * 2017-06-26 2019-01-01 鞍钢股份有限公司 Without 590MPa grades of cold-rolled biphase steels of striated surface defect and production method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110343829A (en) * 2019-08-06 2019-10-18 北京首钢冷轧薄板有限公司 A kind of technique that cold rolling produces yield strength 700MPa grades of dual phase steel
CN115135797A (en) * 2019-12-19 2022-09-30 Posco公司 Steel sheet having excellent wear resistance and composite corrosion resistance, and method for producing same
CN115135797B (en) * 2019-12-19 2023-09-22 Posco公司 Steel sheet excellent in wear resistance and composite corrosion resistance and method for producing same
CN111424211A (en) * 2020-04-30 2020-07-17 鞍钢股份有限公司 Weather-resistant steel for wide 700 MPa-grade hot-rolled container and manufacturing method thereof
CN112662856A (en) * 2020-12-04 2021-04-16 安阳钢铁股份有限公司 Production method of cold-rolled acid-resistant steel 09CrCuSb
CN112662856B (en) * 2020-12-04 2023-06-02 安阳钢铁股份有限公司 Production method of cold-rolled acid-resistant steel 09CrCuSb
CN112831726A (en) * 2021-01-06 2021-05-25 鞍钢股份有限公司 Coating-free high-carbon high-strength corrosion-resistant electromagnetic steel plate and production method thereof
CN114737116A (en) * 2022-03-30 2022-07-12 鞍钢股份有限公司 700 MPa-grade wear-resistant corrosion-resistant steel and manufacturing method thereof

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