CN105734406A - High-performance hot-rolled H profile steel resisting atmosphere corrosion and preparation method thereof - Google Patents

High-performance hot-rolled H profile steel resisting atmosphere corrosion and preparation method thereof Download PDF

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CN105734406A
CN105734406A CN201610187191.6A CN201610187191A CN105734406A CN 105734406 A CN105734406 A CN 105734406A CN 201610187191 A CN201610187191 A CN 201610187191A CN 105734406 A CN105734406 A CN 105734406A
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steel
corrosion resistance
profile steel
atmospheric corrosion
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蒋南宁
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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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • 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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • 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
    • 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
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing 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
    • 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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C21D2211/002—Bainite
    • 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

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Abstract

The invention aims to solve the defects of welding and strength performances in traditional weather-resistant H profile steel, and provides high-performance hot-rolled H profile steel resisting atmosphere corrosion and a preparation method thereof. The H profile steel comprises the following chemical components: C, Si, Mn, Cr, Cu, Ni, Mo, Sb, Als, not more than 0.025% of P, not more than 0.010% of S, not more than 0.0080% of N, Bs, Nb, Ti, V, Ca, and the balance of Fe and inevitable impurities; and the required atmosphere corrosion resisting index I is not less than 6.30. The preparation method is to perform air cooling or rapid cooling for a forging blank of the components after secondary rolling. The product reduces the carbon content, adds the microalloying elements of Nb and Ti, adds Ni, Mo, Cu and Cr, and also adds Sb to greatly improve the corrosion resistance in industrial-polluted atmosphere environment containing such higher pollutants as SO2; the steel structure of the product mainly adopts ferrite and ferrite+bainite; and the product has the yield strength of 235-500 MPa grade, is excellent in toughness and plasticity, is excellent in industrial-polluted atmosphere environment corrosion resistance, and can be used without coating in the industrial-polluted atmosphere environment.

Description

A kind of high-performance atmospheric corrosion resistance is hot rolled H-shaped and preparation method thereof
Technical field
The invention belongs to iron and steel and manufacture field, particularly to a kind of, there is the hot rolled H-shaped and preparation method thereof of excellent resistance to atmospheric environment corrosive nature, superior weldability energy and superior low-temperature toughness.
Background technology
Metal material and rotten even destruction of goods thereof that chemistry under atmospheric environment or electrochemical reaction cause are called atmospheric corrosion.Corrosive gas in global atmosphere such as SO2、SO3、H2S、HCl、Cl2、CO2, CO etc. increasingly become the primary killers of atmospheric corrosion, greatly accelerated metal material corrosion in atmospheric environment.SO in atmosphere pollution2Impact is the most serious, is mainly derived from the waste gas that oil, the waste gas of coal combustion and plant produced are discharged, and its dissolubility in aqueous is higher 1300 times than oxygen, makes the SO in solution2Reach significantly high concentration, be dissolved in the moisture film of metal surface, generation H can be reacted2SO3Or H2SO4, pH value can reach 3-3.5, has greatly accelerated corrosion of metal.In air, SO in the corrosion rate of carbon steel and air2Content is linear, is 50-100 times of desert area atmospheric corrosion rate in industrial occupancy.Even if steel surface is zinc-plated, containing SO2Industrial atmosphere in, the corrosion rate of zinc coat can reach 5～10 μm/year, and conventional steel iron surface galvanized layer thickness is the thickest is about 85 μm, can protect at most iron and steel 10～16 years.Visible, for requiring the steel construction of 50 years or 100 years projected life, adopt and zinc-plated can not solve iron and steel Anticorrosion in industrial atmospheric environment at all.
The patent No. is in the corrosion-resistant high-performance H profile steel of a kind of antidetonation of ZL201410087078.1 and processing method patent thereof, disclose the corrosion-resistant high-performance H profile steel of antidetonation and the processing method thereof of a kind of yield strength Rel420～480MPa, its chemical composition of described H profile steel (percentage by weight) is C:0.10～0.15wt%, Si:0.25～0.50wt%, Mn:1.00～1.35wt%, Ti:0.030～0.050wt%, Cr:0.10～0.20wt%, Cu:0.30～0.50wt%, B:0.0020～0.0040wt%, S≤0.020wt%, P≤0.035wt%, all the other are Fe and inevitable impurity.Described H profile steel passes through the H profile steel of selectivity cooling outside heating, de-scaling, preforming, the edge of a wing, finish rolling, the selectivity cooling of R angle, natural cooling, on-line checking, the prepared height of aligning operation, width, web thickness, thickness section physical dimension respectively 400～294mm × 200, the edge of a wing～175mm × 7～8mm × 11～13mm, its yield strength Rel420～480MPa, tensile strength Rm580～650MPa, percentage elongation A > 24.0%, V-type Impact energy Ak v >=70J.This patent H profile steel carbon content is high, and with the addition of B element, and its welding performance and low-temperature impact toughness are poor, and its carbon content is in peritectic steel interval, and continuous casting billet easily splits, and produces to continuous casting billet and welding procedure causes bigger difficulty.Playing the chemical element of weather-proof effect due to its composition in designing is only traditional Cr, Ni element combinations, its poor corrosion resistance in the with serious pollution atmospheric environment of modern industry.
The patent No. is that a kind of yield strength 500MPa level of ZL201310199239.1 is containing in the weather-resistance hot rolled H-shaped rolling mill practice patent of vanadium, disclose a kind of yield strength 500MPa level containing the weather-resistance hot rolled H-shaped rolling mill practice of vanadium, should be weather-resistance hot rolled H-shaped containing vanadium, by mass percentage, composition proportion is C:0.09～0.12, Si:0.43～0.55, Mn:1.39～1.49, P:0.013～0.017, S:0.011～0.016, Cu:0.27～0.36, Cr:0.32～0.38, Ni:0.25～0.32, V:0.098～0.110, AlS:0.014～0.023, all the other are ferrum and remaining trace impurity；This patent of invention remains traditional Cu, Cr, Ni element combinations due to the chemical element playing weather-proof effect in composition design, in the with serious pollution atmospheric environment of modern industry, its decay resistance is general, and its carbon content is in peritectic steel interval, continuous casting billet easily splits, and produces to continuous casting billet and welding procedure causes bigger difficulty.
In sum, it is unreasonable that the deficiency of existing weather-proof H profile steel technology is mainly carbon content height, alloying element proportioning, poor corrosion resistance in industrial atmospheric environment, and the welding performance of steel, low-temperature flexibility are poor simultaneously.
Summary of the invention
Present invention aims to the deficiency of existing weather-proof H profile steel technology, it is provided that a kind of high-performance atmospheric corrosion resistance is hot rolled H-shaped and preparation method thereof.This H profile steel reduce carbon content to 0.015～0.075%, add Nb, Ti micro alloying element and appropriate Ni, Mo, Cu, Cr element while, add Trace Sb element, substantially increase H profile steel containing SO2Deng the decay resistance in the industrial pollution atmospheric environment that pollutant are higher.Structure of steel is controlled as good based on ferrite, ferrite+bainite, yield strength 235～500MPa rank, toughness and plasticity by the method, and has excellent anti-pollution atmosphere environment corrosion and welding performance.The steel adopting manufacture of the present invention can not use in by the atmospheric environment of industrial pollution in application.
Technical scheme is as follows:
nullA kind of high-performance atmospheric corrosion resistance is hot rolled H-shaped，Its chemical composition is by weight percentage: C0.015%～0.075%、Si0.10%～0.70%、Mn0.40%～1.80%、Cr0.25%～1.00%、Cu0.25%～0.55%，Ni0.20%～0.70%，Mo0.00%～0.50%，Sb0.035%～0.100%，Als0.015%～0.070%，P≤0.025%，S≤0.010%，N≤0.0080%，Bs0.0000%～0.0025%，Nb0.015%～0.100%、Ti0.005%～0.030%、And Ti+Nb≤0.12%，V0.000%～0.070%，Ca0.0010%～0.0070%，Surplus is Fe and inevitable impurity，And make atmospheric corrosion resistance index I=26.01 (%Cu)+3.88 (%Ni)+1.20 (%Cr)+1.49 (%Si)+17.28 (%P)-7.29 (%Cu) (%Ni)-9.10 (%Ni) (%P)-33.39 (%Cu)2≥6.30；
nullOr chemical composition is by weight percentage: C0.015%～0.075%、Si0.10%～0.70%、Mn0.40%～1.80%、Cr0.25%～1.00%、Cu0.25%～0.55%，Ni0.20%～0.70%，Mo0.00%～0.50%，Sb0.035%～0.100%，Als0.015%～0.070%，P≤0.025%，S≤0.010%，N≤0.0080%，Bs0.0000%～0.0025%，Nb0.015%～0.100%、Ti0.005%～0.030%、And Ti+Nb≤0.12%，V0.000%～0.070%，RE0.05%～0.20%，Surplus is Fe and inevitable impurity，And make atmospheric corrosion resistance index I=26.01 (%Cu)+3.88 (%Ni)+1.20 (%Cr)+1.49 (%Si)+17.28 (%P)-7.29 (%Cu) (%Ni)-9.10 (%Ni) (%P)-33.39 (%Cu)2≥6.30；Wherein RE is rare earth element, lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutecium (Lu) and one or more in the element such as scandium (Sc) and yttrium (Y) can be included；
Preferably, in above-mentioned H profile steel, Cr content is 0.25%～0.70%；
Mo content is 0.05～0.50%；
Bs content is 0.0007%～0.0020%；
Al content is 0.015%～0.050%；
V content is 0.015～0.070%.
The steel grade of the present invention adopts the reason of above-mentioned alloying element to be in that:
C: carbon is very big on the impact of the intensity of steel, toughness and welding performance, the decay resistance of steel grade is also had impact simultaneously；Carbon is low lower than 0.015% intensity, smelts and welding difficulty is big；Carbon is higher than 0.075%, then generating tissue medium pearlite amount increases, and ferrite, bainite structure reduce, and makes intensity, elongation percentage and toughness, decay resistance decline.Therefore present invention determine that ranging for of carbon content: 0.015%～0.075%.
Si: silicon is the essential elements of deoxidation in steel making, it is also possible to play solution strengthening effect, improves the intensity of steel, and Si can also improve the atmospheric corrosion resistance of steel, but the too high toughness that can reduce steel of Si content, welding performance is also unfavorable.Therefore, in the present invention silicon is limited between 0.10%～0.70%.
Mn: manganese is the effective element improving intensity and toughness, and when its content is higher, bainite transformation has bigger facilitation, and with low cost；This constituent content reduces plasticity and the toughness of steel hardly while increasing hardness of steel in certain scope；The additionally too high atmospheric corrosion resistance that can reduce steel of manganese.Therefore, in the present invention according to intensity need add Mn suitable interval be 0.4%～1.8%.
Cu: copper be improve steel the most important alloying element of atmospheric corrosion resistance, add more Cu to improve steel corrosion resistance advantageously, but during Cu content height worsen steel surface performance；Additionally, welding heat affected zone hardening and toughness are not only had harmful effect by copper, the intensity of mother metal can be made again to improve, and make low-temperature flexibility be greatly improved.Therefore, in the present invention by copper content control 0.25%～0.55%.
Ni: welding heat affected zone hardening and the toughness of steel are not had harmful effect by nickel element, can improve the atmospheric corrosion resistance of steel simultaneously, and, nickel makes the low-temperature flexibility of steel be greatly improved；But nickel is noble element, cause that the cost of steel significantly rises.Therefore, in the present invention Ni content is controlled 0.20%～0.70%.
Cr: chromium is one of main alloy element of atmospheric corrosion resistance improving steel, forms fine and close rusty scale on steel surface, and protection steel does not continue to corrosion, adds with Cu compound, and corrosion resistance significantly improves；And Cr can promote bainite transformation, when contributing to rolling, the refinement of austenite crystal and the generation of fine bainite, improve tensile strength；But, Cr is medium carbide former, and when in steel, Cr constituent content is more than 0.70%, the carbide crystal boundary initially forming Cr precipitates out, and makes the impact flexibility of steel, plasticity decline.Therefore, in the present invention, Cr constituent content controls 0.25%～1.00%, and optimal control is 0.25%～0.70%.
Mo: molybdenum is also able to be effectively improved the alloying element of atmospheric corrosion resistance, and, molybdenum contributes to the refinement of austenite crystal during rolling and the generation of fine bainite, but when adding more than 0.5%, solderability reduces；Additionally, Mo is noble element, cause that the cost of steel significantly rises.Therefore, in the present invention Mo content is controlled 0.00%～0.50%.
Sb: antimony is to improve steel chemical element of corrosion resistance most pronounced effects in sour environment (containing sulphuric acid, hydrochloric acid etc.), but Sb belongs to the intensity to steel, toughness, plasticity and weldability and has the element of adverse effect.Therefore the content of Sb element is controlled 0.035%～0.100% by steel grade of the present invention.
B: boron can improve the quenching degree of steel, the notable postponement austenite transformation to ferrite, pearlite, when there being Nb to exist simultaneously, the effect of B is more prominent；In the present invention, not all of intensity rank or specification all add B element, when H profile steel requires that yield strength rank can add B element, Substitute For Partial Mo element when more than 450MPa, reduce cost.Therefore in the present invention boron is limited between 0.0000%～0.0025% (in acid-soluble boron s)；The optimum content added is interval 0.0007%～0.0020%.
Nb: niobium is the important addition element of the present invention, it can effectively the austenitic recrystallization of delayed deformation, stop Austenite Grain Growth, improve austenite recrystallization temperature, crystal grain thinning, improve intensity and the toughness of steel simultaneously；And, Nb is strong carbon, nitride forming element, it is possible to is combined with carbon, nitrogen to be formed and stablizes tiny carbon, nitride, plays significant precipitation strength effect.Therefore in the present invention Nb content is limited in 0.015%～0.100% scope.
Ti: add titanium, one is the austenite crystal in order to refine when steel billet reheats and welding heat affected zone, improves toughness, and two is the nitrogen element in order to fix in steel, so that it is guaranteed that the raising quenching degree effect of boron element；And, titanium, nitrogen can form titanium nitride, stop steel billet the growing up of crystal grain in heating, rolling, welding process, improve the toughness of mother metal and welding heat affected zone.Therefore in the present invention, in conjunction with the content of N in steel, by titanium Composition Control 0.005%～0.030%.
V: can rely on vanadium precipitation strength, improves the yield strength of steel, the atmospheric corrosion resistance of steel is also had advantageous effect, but welding performance and the low-temperature flexibility of steel are had adverse effect by V.In the present invention V content is limited to 0.000%～0.070%.
Al: aluminum is deoxidant element, it is possible to as AlN forming element, can crystal grain thinning effectively.Therefore in the present invention aluminum content is limited to 0.010%～0.07%；Best interval 0.015%～0.050%.
P: phosphorus is to improve one of maximally effective alloying element of steel atmospheric corrosion resistance in alloying element, when P and Cu combines in addition steel, it is shown that better complex effect；But, P worsens the welding performance of steel, worsens the plasticity of steel, toughness, particularly acutely reduces low-temperature impact toughness；It is also easy to spot segregation, forms banded structure.Therefore in the present invention, P content controls at P≤0.025%.
S: sulfur is the element that steel grade corrosion resistance is the most harmful, reduces sulfur content, to the atmospheric corrosion resistance of steel grade, acid resistance electrolyte solution corrosive nature, anti-H2The corrosive natures such as S all have good action；Meanwhile, the toughness of steel, plasticity etc. are also had adverse effect by sulfur height.Therefore the present invention controls S≤0.010%.
Being possible not only to significantly improve the overall atmospheric corrosion resistance of steel in Ca: trace Ca addition weathering steel, and can be prevented effectively from the rust liquid stream occurred when weathering steel uses and hang phenomenon, Ca, Si are used in combination effect more preferably；Additionally, Ca can process change inclusion morphology, improve the Z-direction performance of steel, lateral performance, reduce anisotropy.In the present invention, Ca content controls 0.0010%～0.0070%.
RE: rare earth element can accelerate the formation of weathering steel surface compact rusty scale, improves steel decay resistance；And to steel aseptic, change the state that steel inclusion exists, what minimizing was harmful is mingled with greatly quantity, reduces corrosion source point, thus improving the weather-resistant performance of steel；The segregation also making P alleviates, and reduces the P adverse effect to Steel Properties；And rare earth element can change inclusion morphology, improve the Z-direction performance of steel, lateral performance, reduce anisotropy.In steel of the present invention, RE addition (non-content) controls 0.05%～0.20%, and both Ca, RE are alternative adds one.
Impurity element in steel: H, N, O etc. control more low more good, and to improve the combination property of steel, the present invention controls target H≤0.0002%, N≤0.008%, O≤0.003%.
So, the atmospheric corrosion resistance of H profile steel of the present invention controls to realize mainly through the Optimized Matching of the above alloying element and the strict of production technology.
The preparation method that above-mentioned high-performance atmospheric corrosion resistance is hot rolled H-shaped, comprises the steps:
1) strand is smelted
nullThe steel grade of the present invention is smelted and strand，Its chemical composition is by weight percentage: C0.015%～0.075%、Si0.10%～0.70%、Mn0.40%～1.80%、Cr0.25%～1.00%、Cu0.25%～0.55%，Ni0.20%～0.70%，Mo0.00%～0.50%，Sb0.035%～0.100%，Als0.015%～0.070%，P≤0.025%，S≤0.010%，N≤0.0080%，Bs0.0000%～0.0025%，Nb0.015%～0.100%、Ti0.005%～0.030%、And Ti+Nb≤0.12%，V0.000%～0.070%，Ca0.0010%～0.0070%，Surplus is Fe and inevitable impurity，And make atmospheric corrosion resistance index I=26.01 (%Cu)+3.88 (%Ni)+1.20 (%Cr)+1.49 (%Si)+17.28 (%P)-7.29 (%Cu) (%Ni)-9.10 (%Ni) (%P)-33.39 (%Cu)2≥6.30；
nullOr its chemical composition is by weight percentage: C0.015%～0.075%、Si0.10%～0.70%、Mn0.40%～1.80%、Cr0.25%～1.00%、Cu0.25%～0.55%，Ni0.20%～0.70%，Mo0.00%～0.50%，Sb0.035%～0.100%，Als0.015%～0.070%，P≤0.025%，S≤0.010%，N≤0.0080%，Bs0.0000%～0.0025%，Nb0.015%～0.100%、Ti0.005%～0.030%、And Ti+Nb≤0.12%，V0.000%～0.070%，RE0.05%～0.20%，Surplus is Fe and inevitable impurity，And make atmospheric corrosion resistance index I=26.01 (%Cu)+3.88 (%Ni)+1.20 (%Cr)+1.49 (%Si)+17.28 (%P)-7.29 (%Cu) (%Ni)-9.10 (%Ni) (%P)-33.39 (%Cu)2≥6.30；Wherein RE is rare earth metal, lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutecium (Lu) and one or more in the element such as scandium (Sc) and yttrium (Y) can be included；
Preferably, in above-mentioned steel grade, Cr content is 0.25%～0.70%；
Mo content is 0.05～0.50%；
Bs content is 0.0007%～0.0020%；
Al content is 0.015%～0.050%；
V content is 0.015～0.070%；
Described smelting and strand are conventional method, it may include: molten iron pretreatment, heavily desulfurating and reducing low sulfur content；Adopt converter smelting, by top blast or top bottom blowing, deep as far as possible decarburization, dephosphorization；Adopt VD or RH application of vacuum, LF etc. to carry out refining treatment, reduce the harmful element content such as S, H, O, N, and carry out microalloying；Carry out Ca process, feed Si-Ca line according to Ca content requirement, or carry out RE-treated；Control oxide morphology, improve ductility and toughness, reduce the horizontal and vertical poor performance of steel plate；Continuous casting adopts electromagnetic agitation, argon shield casting, reduces element segregation, improves slab quality；
2) rolling
By heating steel billet to 1050 DEG C～1220 DEG C before rolling, the upper limit selects 1220 DEG C, it is ensured that obtain tiny austenite crystal, and lower limit selects 1050 DEG C, considerable amount of Nb can be had to dissolve in austenite, be conducive to the precipitation strength in the refinement of austenite in the operation of rolling and roller repairing process；
Then two-stage control rolling is adopted: control temperature >=980 DEG C, the steel edge of a wing in roughing finish to gauge stage；The steel edge of a wing temperature controlling the finish rolling stage is 950 DEG C～750 DEG C, and the steel edge of a wing temperature controlling the finish rolling finish to gauge stage is 870 DEG C～750 DEG C；Being rolling to H profile steel edge of a wing thickness is 6～50mm；
3) cooling
H profile steel after rolling is carried out air cooling or quickly cooled down, and the structure of steel after cooling is based on ferrite, ferrite+bainite；
Wherein, quickly the cooling system of cooling is: it is 680 DEG C～400 DEG C that H profile steel is quickly cooled to steel edge of a wing temperature, then carries out natural cooling at cold bed or be quickly cooled to room temperature, and best rate of cooling is 5～60 DEG C/S.
After testing, the hot rolled H-shaped yield strength of high-performance atmospheric corrosion resistance that the present invention prepares is 256～590MPa, has reached 235～500MPa rank；Tensile strength is 407～720MPa；A% is 19～34%；The KV2 of-40 DEG C is 146～329J；Atmospheric corrosion resistance preferably, and owing to low carbon content makes its welding performance be greatly improved.
Compared with prior art, present invention have an advantage that
1, high-performance provided by the invention is hot rolled H-shaped has high intensity, high tenacity, excellent welding performance and good anti-pollution atmosphere environment corrosion performance, and yield strength reaches 235～500MPa rank.
2, H profile steel of the present invention reduce carbon content to 0.015～0.075%, add Nb, Ti micro alloying element and appropriate Ni, Mo, Cu, Cr element while, add Trace Sb element, substantially increase H profile steel containing SO2Deng the decay resistance in the industrial pollution atmospheric environment that pollutant are higher.
3, the chemical composition of steel of the present invention and manufacture method are equally applicable to the manufacture of all kinds of shaped steel such as I-steel, channel-section steel and angle steel, round steel, steel pipe etc..The steel adopting manufacture of the present invention can not use in by the atmospheric environment of industrial pollution in application.Product is mainly used in electric power pylon, railway contact line pillar, bridge and the steel construction such as railing, road and rail guardrail, substitutes zinc-plated or coating application repeatedly, is beneficial to environmental conservation, belongs to green manufacturing.
Accompanying drawing explanation
Fig. 1, the embodiment of the present invention 2 and the tradition high weather resistance steel 09CuPCrNi corrosion depth figure when simulating industrial atmosphere.
The exposed sample of Fig. 2, the embodiment of the present invention 2 and tradition high weather resistance steel 09CuPCrNi and the AC impedance spectrogram with rust sample.
Detailed description of the invention
The present invention adopts Rolling With Universal Mill in the finish rolling stage.
The chemical composition of the embodiment of the present invention 1～14 is as shown in table 1, rolled h-section steel beam edge of a wing thickness 6～50mm, its actual rolling mill practice and to roll state property energy assay as shown in table 2.
Table 2 embodiment rolling mill practice and roll state property energy assay
Wherein, the final cooling temperature of first time cooling when the final cooling temperature described in table is adopt acceleration cooling method.
Corrosion resistance is tested
Experiment 1
Indoor week leaching experiment (alternate-immersion experiment) of industrial atmospheric environment it is simulated, to verify the resistance to industrial atmospheric performance of steel grade of the present invention at laboratory.The steel of the present invention adopted is embodiment 2, and contrast steel grade is tradition high weather resistance steel 09CuPCrNi, and test medium is the NaHSO of concentration 0.08547mol/L3Solution, experiment parameter is: immerse time 10min, drying time 50min, solution temperature 27 ± 1 DEG C, air themperature 27 ± 1 DEG C, relative humidity 30%RH, within 2 days, take a sample.Testing and after terminating, the average corrosion depth of sample has been measured and calculated, the result of the corrosion depth when simulating industrial atmosphere is as shown in Figure 1.
As seen from Figure 1, each test steel corrosion degree of depth extends all in rising trend with etching time, and that final corrosion depth is maximum is contrast sample 09CuPCrNi, for about 1.24 times of the steel corrosion degree of depth of the present invention.
Experiment 2
Exposed sample and the ac impedance spectroscopy with rust sample is at room temperature measured with the frequency response instrument that model is 1255B and the voltage stabilizing instrument associating that model is PAR1287A.The measurement of ac impedance spectroscopy is at 0.5%NaHSO3Carrying out in solution, sinusoidal voltage is close to open-circuit voltage, and amplitude is 10mv, frequency range 106～10-2Hz.Result is as in figure 2 it is shown, under industrial atmospheric environment, naked steel curved beam is quickly generated corrosion products film.Two samples all show as capacitive reactance arc at high frequency region, and the capacitive reactance arc radius of steel grade of the present invention is significantly greater than contrast steel grade 09CuPCrNi, and diffusing phenomenon then occurs in low frequency range.Show that rusty scale protectiveness is by being followed successively by weak ordering by force: steel > 09CuPCrNi of the present invention, this result is consistent with corrosion depth measurement result.
Conclusion
From simulation industrial atmosphere corrosion test result, the decay resistance of steel of the present invention is better than tradition high weather resistance steel 09CuPCrNi.

Claims (10)

  1. null1. a high-performance atmospheric corrosion resistance is hot rolled H-shaped，It is characterized in that，Its chemical composition is by weight percentage: C0.015%～0.075%、Si0.10%～0.70%、Mn0.40%～1.80%、Cr0.25%～1.00%、Cu0.25%～0.55%，Ni0.20%～0.70%，Mo0.00%～0.50%，Sb0.035%～0.100%，Als0.015%～0.070%，P≤0.025%，S≤0.010%，N≤0.0080%，Bs0.0000%～0.0025%，Nb0.015%～0.100%、Ti0.005%～0.030%、And Ti+Nb≤0.12%，V0.000%～0.070%，Ca0.0010%～0.0070%，Surplus is Fe and inevitable impurity；And make atmospheric corrosion resistance index I=26.01 (%Cu)+3.88 (%Ni)+1.20 (%Cr)+1.49 (%Si)+17.28 (%P)-7.29 (%Cu) (%Ni)-9.10 (%Ni) (%P)-33.39 (%Cu)2≥6.30。
  2. null2. a high-performance atmospheric corrosion resistance is hot rolled H-shaped，It is characterized in that，Chemical composition is by weight percentage: C0.015%～0.075%、Si0.10%～0.70%、Mn0.40%～1.80%、Cr0.25%～1.00%、Cu0.25%～0.55%，Ni0.20%～0.70%，Mo0.00%～0.50%，Sb0.035%～0.100%，Als0.015%～0.070%，P≤0.025%，S≤0.010%，N≤0.0080%，Bs0.0000%～0.0025%，Nb0.015%～0.100%、Ti0.005%～0.030%、And Ti+Nb≤0.12%，V0.000%～0.070%，RE0.05%～0.20%，Surplus is Fe and inevitable impurity；And make atmospheric corrosion resistance index I=26.01 (%Cu)+3.88 (%Ni)+1.20 (%Cr)+1.49 (%Si)+17.28 (%P)-7.29 (%Cu) (%Ni)-9.10 (%Ni) (%P)-33.39 (%Cu)2≥6.30。
  3. 3. a kind of high-performance atmospheric corrosion resistance according to claim 1 and 2 is hot rolled H-shaped, it is characterised in that in described H profile steel, Cr content is 0.25%～0.70%.
  4. 4. a kind of high-performance atmospheric corrosion resistance according to claim 1 and 2 is hot rolled H-shaped, it is characterised in that in described H profile steel, Mo content is 0.05～0.50%.
  5. 5. a kind of high-performance atmospheric corrosion resistance according to claim 1 and 2 is hot rolled H-shaped, it is characterised in that in described H profile steel, Bs content is 0.0007%～0.0020%.
  6. 6. a kind of high-performance atmospheric corrosion resistance according to claim 1 and 2 is hot rolled H-shaped, it is characterised in that in described H profile steel, Al content is 0.015%～0.050%.
  7. 7. a kind of high-performance atmospheric corrosion resistance according to claim 1 and 2 is hot rolled H-shaped, it is characterised in that in described H profile steel, V content is 0.015～0.070%.
  8. 8. the preparation method that high-performance atmospheric corrosion resistance described in a claim 1 or 2 is hot rolled H-shaped, it is characterised in that comprise the steps:
    1) strand is smelted
    Carry out smelting and strand according to the chemical composition proportioning of this H profile steel；
    2) rolling
    By heating steel billet to 1050 DEG C～1220 DEG C before rolling；
    Then two-stage control rolling is adopted: control temperature >=980 DEG C, the steel edge of a wing in roughing finish to gauge stage；The steel edge of a wing temperature controlling the finish rolling stage is 950 DEG C～750 DEG C, and the steel edge of a wing temperature controlling the finish rolling finish to gauge stage is 870 DEG C～750 DEG C；Being rolling to H profile steel edge of a wing thickness is 6～50mm；
    3) cooling
    H profile steel after rolling is carried out air cooling or quickly cools down；
    Wherein, the cooling system of quickly cooling is: it is 680 DEG C～400 DEG C that H profile steel is cooled to steel edge of a wing temperature, then carries out natural cooling at cold bed or be quickly cooled to room temperature.
  9. 9. the preparation method that a kind of high-performance atmospheric corrosion resistance according to claim 8 is hot rolled H-shaped, it is characterised in that the rate of cooling of described quickly cooling is 5～60 DEG C/S.
  10. 10. the preparation method that a kind of high-performance atmospheric corrosion resistance according to claim 8 is hot rolled H-shaped, it is characterised in that the structure of steel of the H profile steel that described method prepares is based on ferrite, ferrite+bainite；Yield strength is 256～590MPa, and tensile strength is 407～720MPa, A% is 19～34%；The KV2 of-40 DEG C is 146～329J.
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Application publication date: 20160706