CN101376953B - High-corrosion resistant high-strength weather resisting steel and manufacturing method thereof - Google Patents
High-corrosion resistant high-strength weather resisting steel and manufacturing method thereof Download PDFInfo
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- CN101376953B CN101376953B CN200710045329XA CN200710045329A CN101376953B CN 101376953 B CN101376953 B CN 101376953B CN 200710045329X A CN200710045329X A CN 200710045329XA CN 200710045329 A CN200710045329 A CN 200710045329A CN 101376953 B CN101376953 B CN 101376953B
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Abstract
The invention provides high-corrosion resistance and high-strength weather resistant steel which comprises the following chemical components (in weight percentage): 0.002 percent to 0.005 percent of C, 0.20 percent to 0.40 percent of Si, 0.01 percent to 0.05 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.008 percent of S, 0.01 percent to 0.05 percent of Al, 0.20 percent to 0.40 percent of Cu, 4.50 percent to 5.50 percent of Cr, less than or equal to 0.40 percent of Ni, 0.001 percent to 0.006 percent of Ca, 0.001 percent to 0.006 percent of N, less than or equal to 0.03 percent of Ti, and the rest are Fe and other inevitable impurities. The invention also provides a manufacturing method of the weather resistant steel. The yield strength of the weather resistant steel is more than 700MPa, the extensibility is more than 20 percent and the atmospheric corrosion resistance is higher than that of traditional high-strength weather resistant steel; in addition, the steel can be directly used in atmospheric environment without being coated, and meets the requirements of railway freight car, container and bridge building fields.
Description
Technical field
The invention belongs to field of iron and steel, more specifically, the present invention relates to a kind of high-corrosion resistant high-strength weather resisting steel and manufacture method thereof.Described high-corrosion resistant high-strength weather resisting steel is suitable for non-packed to be used.
Background technology
Up to now, declared multinomial patent of invention with regard to high-strength weathering steel (or claiming weather resisting steel) and manufacture method thereof both at home and abroad.For example, domestic mainly containing:
The patent application (chemical ingredients sees Table 1) of 2006 disclosed " low temperature high toughness weather corrosion resistant steel and manufacture method thereof " (patent publication No. " CN1718832A ") with 600MPa level;
The Chinese patent application of " a kind of economy type weathering-resistant steel " (patent publication No. " CN1800428A ");
Disclosed " acicular structure high strength weathering steel and manufacture method thereof " patent publication No. " CN1609257A " in 2005) mandate Chinese patent (chemical ingredients sees Table 1);
4 patents such as the Chinese granted patent of calendar year 2001 disclosed " weather resisting steel " (patent publication No. " CN1280207A ") or patent application technology.
Abroad mainly contain: " Thermomechanically Controlled Processed High Strength WeatheringSteel with Low Yield/Tensile Ratio " be (chemical ingredients sees Table 1) and " Ultra-low CarbonBainitic Weathering Steel " (US6315946) 2 (US6056833).The steel grades that above-mentioned patent documentation provides all comes from the CORTEN steel series that the U.S. invents at first, its composition system belongs to Cu-P-Cr-Ni system or Cr-Mn-Cu system, add other trace alloying elements and under certain rolling technology condition, obtain the different tissues form by auxiliary, thereby reach required mechanical property and corrosion resisting property.
The composition contrast (wt%) of the relevant steel grade of table 1
Above-mentioned steel grade all belongs to the low-alloy class.Under atmosphere Service Environment condition, in the steel between each alloying element interaction takes place, generating with α-FeOOH on the surface is the outer rusty scale of main component, its compact structure, Thermodynamically stable does not participate in the cathode reduction process of steel galvanic corrosion.When the enrichment of chromium in the rusty scale reaches 5% left and right sides, also can make the rusty scale of formation have ion selectivity, make that the atmospheric corrosion resistance of steel is significantly improved through characteristic.When being exposed to general natural environmental condition (be non-packed use) following time, the comparable ordinary steel of the weather-resistance of weathering steel improves 2～8 times.
But corrode under the comparatively harsh envrionment conditions at some, according to United States Government Guidelines, weathering steel must can use after application.Under the higher coastal environment condition of saltiness in air, because the strong penetration of chlorion and to the continuous destruction of corrosion products film, the above-mentioned weathering steel that develops based on the Corten steel all can not form the stabilization rusty scale, its weathering steel surface rusty scale forms layered structure usually, and after exposing certain hour serious big area peeling phenomenon can take place, be difficult to satisfy the solidity to corrosion needs.Therefore, above-mentioned weathering steel must could use after the application, causes use cost to increase, that is, described weathering steel is not suitable for non-packed and uses, and causes environmental pollution.
In China, weathering steel is mainly used in rail truck and makes the field.In recent years, railway interests has carried out complete investigation to the railway goods that the weather-proof steel of the low-alloy that adopts aforementioned composition system is made with the carrier vehicle corrosion condition, and the result shows: the corrosion resisting property of existing common high-strength weathering steel can not satisfy the technical need in 25 years of design life.Studies show that and adopt the auxiliary corrosion resisting property that microalloy element can not increase substantially steel of adding, and adopt stainless steel that the vehicle manufacturing cost is improved greatly.
For improving the design service life of rail truck, prolong the repair in shop cycle, further improve the technical equipment of existing rail truck, an urgent demand breaks through the composition system of original weathering steel, in the intensity rank that improves weathering steel, guarantees that it has excellent more corrosion resistance nature, and can directly use without application, that is, non-packed uses, to reduce environmental pollution and manufacturing cost.The present inventor has solved the problems referred to above by research, has finally obtained a kind of high-corrosion resistant high-strength weather resisting steel, thereby has finished the present invention.
Therefore, first purpose of the present invention is to provide a kind of high-corrosion resistant high-strength weather resisting steel, and described high-corrosion resistant high-strength weather resisting steel is particularly suitable for non-packed and uses.
Second purpose of the present invention is to provide the manufacture method of this high-corrosion resistant high-strength weather resisting steel.
Summary of the invention
One aspect of the present invention provides a kind of high-corrosion resistant high-strength weather resisting steel, described weathering steel comprises following chemical ingredients (wt%): C:0.002-0.005, Si:0.20-0.40, Mn:0.01～0.05, P≤0.020, S≤0.008, Al:0.01-0.05, Cu:0.20-0.40, Cr:4.50-5.50, Ni:0.10-0.40, Ca:0.001-0.006, N:0.001-0.006, Ti:0.01-0.03, surplus is Fe and inevitable other impurity elements.
The effect of above-mentioned each chemical ingredients is as described below.
The ultralow C design of C:0.002-0.005% has been to suppress the formation of pearlitic structure and other carbide, guarantees that the microstructure of steel is equal phase constitution, has avoided the potential difference between the out-phase to cause galvanic corrosion, has improved the corrosion resisting property of steel.
Si: content is controlled at 0.20～0.40%, and Si has higher solid solubility in steel, can increase ferrite volume fraction in the steel, crystal grain thinning, thereby help improving toughness, but too high levels can cause welding property to descend, so the upper limit is controlled at 0.40%.
Mn: have stronger solution strengthening effect, can significantly reduce the transformation temperature of steel, the microstructure of refinement steel, it is important highly malleablized element, but Mn content too much makes hardening capacity increase, thereby cause weldability and welding heat influence area toughness to worsen, so its content is controlled at 0.01～0.05%.
S, P: its existence will worsen the atmospheric corrosion resistance of steel, and P can effectively improve the atmospheric corrosion resistance of steel, but P content is crossed high toughness and the plasticity that reduces steel of meeting, thereby extremely low S, P content are adopted in steel grade of the present invention design simultaneously, its span of control is P≤0.020, S≤0.008.
Al: be the reductor that adds in the steel, the Al of 0.01-0.05% content helps crystal grain thinning, improves the toughness and tenacity of steel.
Cr: the passivation ability that improves steel is had significant effect, can promote the steel surface to form fine and close passive film or protectiveness rusty scale, its enrichment in rusty scale can effectively improve the selective permeation characteristic of rusty scale to corrosive medium.Its content can make the traditional relatively weathering steel of atmospheric corrosion resistance of steel double at 4.50-5.50%.Cr content influences as shown in Figure 1 the atmospheric corrosion resistance of steel.
Cu: have synergy with Cr, effectively improve the atmospheric corrosion resistance of steel, but too high Cu can cause the hot-short of steel, so its content is controlled at 0.20-0.40%.
Ni: can significantly improve the low-temperature flexibility of steel, can stop effectively simultaneously that Cu's is hot-short.Because Ni is the noble metal element, for cost factor, the upper limit of Ni is controlled at 0.40%, too high Ni can increase the adhesivity of oxide skin, is pressed in the steel and can forms the hot rolling defective on the surface.
Ca: the Ca that adds 0.001-0.006% in the alloy system composition can improve the corrosion resisting property of steel simultaneously and improve the mechanical property of steel; the Ca that adds in the steel exists with compound (as CaS, CaO or other mixture) state; can generate the weakly alkaline environment of microcell by hydrolysis reaction, help the generation of protective oxide alpha-feooh.On the other hand, can improve steel inclusion form and distribution, the isotropy that helps improving the toughness of steel and guarantee mechanical property by little Ca processing.
Ti: the main purpose of adding 0.01-0.03%Ti be suppress slab again the austenite crystal in the thermal process grow up, in recrystallize controlled rolling process, suppress ferrite crystal grain simultaneously and grow up, improve the toughness of steel.
The present invention provides the manufacture method of this high-corrosion resistant high-strength weather resisting steel on the other hand, described method comprises that molten iron takes off S, converter top bottom blowing, external refining, continuous casting, slab reheat, controlled rolling, controlled chilling deeply, batches and finishing, it is characterized in that the reheat temperature in the described slab reheat step is greater than 1200 ℃; Described controlled rolling step adopts two sections controlled rolling technologies; In the described controlled chilling step, rate of cooling is 5-8 ℃/s; Described batching in the step, coiling temperature are 600-650 ℃.
According to the manufacture method of high-corrosion resistant high-strength weather resisting steel of the present invention, one preferred embodiment is, in the controlled rolling step, the cumulative deformation more than 950 ℃ is greater than 80%.
According to the manufacture method of high-corrosion resistant high-strength weather resisting steel of the present invention, one preferred embodiment is, in the controlled rolling step, the roughing finishing temperature is not less than 880 ℃.
According to the manufacture method of high-corrosion resistant high-strength weather resisting steel of the present invention, one preferred embodiment is, in the controlled rolling step, the finish rolling finishing temperature is 800-850 ℃.
According to the manufacture method of high-corrosion resistant high-strength weather resisting steel of the present invention, its typical process flow comprises following each step:
Molten iron takes off S (guarantee steel in low S content), converter top bottom blowing (control C content), external refining, continuous casting (machine is clear), slab reheat, controlled rolling, controlled chilling deeply, batches, finishing.
The reason of controlling each manufacturing step is as described below:
1) take all factors into consideration the microalloy element carbonitride in austenite solubility behavior and heat-processed in the austenite crystal behavior of growing up, steel billet is more than 1200 ℃ again after the heat, through two sections controlled rolling technologies;
2) for guaranteeing the recrystallize grain refinement effect, require accumulative total deflection 〉=80% more than 950 ℃, the finish rolling finishing temperature is not less than 880 ℃ (the finished product thickness increase can suitably reduce finishing temperature);
3) for guaranteeing the deformation grain refinement effect, finishing temperature is controlled at 800-850 ℃, quickens to be cooled to 600-650 ℃ with the rate of cooling of 5-8 ℃/s then and batches, and is cooled to room temperature afterwards again.
Beneficial effect
1. according to steel grade provided by the invention, its yield strength reaches more than the 700MPa, belongs to high-strength weathering steel, can effectively reduce the deadweight of member, thus the manufacturing cost of reduction rail truck etc.
2. the adding of moderate content alloying elements cr has guaranteed that steel grade provided by the invention has good atmospheric corrosion resistance, with respect to traditional weathering steel, this its atmospheric corrosion resistance of steel grade provided by the invention is enhanced about more than once, can replace traditional high-strength weathering steel, and can directly apply to railway freight-car, freight container and bridge field without application, reduce and use and maintenance cost.
3. steel grade provided by the invention adopts the manufacturing of controlled rolling and controlled cooling (TMCP) manufacturing process, do not need to heat-treat, but the hot-rolled state supply of material has effectively guaranteed delivery cycle, has reduced manufacturing cost.
Description of drawings
Fig. 1 Cr content is to the influence of the atmospheric corrosion resistance of steel.
Embodiment
The present invention is further elaborated with embodiment below, but these embodiment have any restriction to the present invention absolutely not.Any change that those skilled in the art are done in to the invention process under the enlightenment of this specification sheets all will drop in the scope of claims.
Embodiment 1Cr content is to the influence of the atmospheric corrosion resistance of steel
Add the atmospheric corrosion resistance influence of the Cr of different content to steel for quantitative expedition, adopt 50Kg vacuum induction furnace laboratory to refine the weather-proof steel grade of the high-Cr of Cr content in the 5-9% scope, adopt the controlling hot rolling technology of common weathering steel to be rolled into the steel plate that thickness is 5mm, with plain carbon stool (SS400, Q345B) and different classes of traditional weathering steel (09CuPCrNi, CortenA, CortenB, Q400NQR1) be the contrast sample, soak into the cycle infiltration cyclic corrosion experiment that corrosion test method (TB/T2375-93) has been carried out 72h with the weathering steel cycle by railway.
The relative corrosion rate of different steel grades, promptly Cr content is seen Fig. 1 to the influence of the atmospheric corrosion resistance of steel.According to shown in Figure 1, when interpolation Cr amount reaches 5% left and right sides in the steel alloy, can make the corrosion resisting property of steel improve nearly 1 times again than traditional weathering steel.
Embodiment 2
1. the manufacturing of present embodiment steel: by molten iron take off S, converter top bottom blowing, external refining, continuous casting, slab reheat, controlled rolling, controlled chilling deeply, batch, finishing, acquisition has the Finished Steel of chemical ingredients as shown in table 2 below, wherein each processing parameter sees Table 6, and mechanical property sees Table 7.
The chemical ingredients (wt%) of table 2 embodiment 2 steel
2. atmospheric corrosion resistance test: with plain carbon stool Q345B and high-strength weathering steel Q450NQR1 is comparative sample, soaks into the cycle infiltration cyclic corrosion experiment that corrosion test method (TB/T2375-93) is carried out 72h by railway with the weathering steel cycle.Try to achieve average corrosion rate by calculation sample unit surface corrosion weight loss amount, and then try to achieve the relative erosion rate of steel grade.Test result sees Table 8.
1. the manufacturing of present embodiment steel: by molten iron take off S, converter top bottom blowing, external refining, continuous casting, slab reheat, controlled rolling, controlled chilling deeply, batch, finishing, acquisition has the Finished Steel of chemical ingredients as shown in table 3 below, wherein each processing parameter sees Table 6, and mechanical property sees Table 7.
The chemical ingredients (wt%) of table 3 embodiment 3 steel
2. atmospheric corrosion resistance test: described with embodiment 2.
Embodiment 4
1. the manufacturing of present embodiment 4 steel: by molten iron take off S, converter top bottom blowing, external refining, continuous casting, slab reheat, controlled rolling, controlled chilling deeply, batch, finishing, acquisition has the Finished Steel of chemical ingredients as shown in table 4 below, wherein each processing parameter sees Table 6, and mechanical property sees Table 7.
The chemical ingredients (wt%) of table 4 embodiment 4 steel
2. atmospheric corrosion resistance test: described with embodiment 2.
1. the manufacturing of present embodiment steel: by molten iron take off S, converter top bottom blowing, external refining, continuous casting, slab reheat, controlled rolling, controlled chilling deeply, batch, finishing, acquisition has the Finished Steel of chemical ingredients as shown in table 5 below, wherein each processing parameter sees Table 6, and mechanical property sees Table 7.
The chemical ingredients (wt%) of table 5 embodiment 5 steel
2. atmospheric corrosion resistance test: described with embodiment 2.
Table 6 embodiment 2-5 steel is made each processing parameter in the process
The mechanical property of table 7 embodiment 2-5 steel
The atmospheric corrosion resistance test result of table 8 embodiment 2-5 steel
In sum, by steel grades scope of design provided by the invention and rolling technology control techniques, the yield strength of gained embodiment steel reaches more than the 700MPa, and unit elongation is more than 20%, and cold-forming property is qualified; The atmospheric corrosion resistance comparing result also shows that the atmospheric corrosion resistance of invention steel grade is more than doubled with respect to traditional high-strength weathering steel Q450NQR1.
As seen, the weather-proof steel grade of high corrosion-proof and high-strength provided by the invention can replace traditional weathering steel and existing high-strength weathering steel fully, do not need application can directly apply under the atmospheric environment condition, satisfy the demand of railway freight-car, freight container manufacturing and bridge construction industrial circle.
Claims (5)
1. high-corrosion resistant high-strength weather resisting steel, it is characterized in that, described high-corrosion resistant high-strength weather resisting steel comprises following chemical ingredients (wt%): C:0.002-0.005, Si:0.20-0.40, Mn:0.01～0.05, P≤0.020, S≤0.008, Al:0.01-0.05, Cu:0.20-0.40, Cr:4.50-5.50, Ni:0.10-0.40, Ca:0.001-0.006, N:0.001-0.006, Ti:0.01-0.03, surplus is Fe and inevitable other impurity elements.
2. the manufacture method of the described a kind of high-corrosion resistant high-strength weather resisting steel of claim 1, comprise that molten iron takes off S, converter top bottom blowing, external refining, continuous casting, slab reheat, controlled rolling, controlled chilling deeply, batches and finishing, it is characterized in that the reheat temperature of described slab reheat step is greater than 1200 ℃; Described controlled rolling step adopts two sections controlled rolling technologies; In the described controlled chilling step, rate of cooling is 5-8 ℃/s; Described batching in the step, coiling temperature are 600-650 ℃.
3. manufacture method as claimed in claim 2 is characterized in that, in described controlled rolling step, the cumulative deformation more than 950 ℃ is greater than 80%.
4. manufacture method as claimed in claim 2 is characterized in that, in described controlled rolling step, the roughing finishing temperature is not less than 880 ℃.
5. manufacture method as claimed in claim 2 is characterized in that, in described controlled rolling step, the finish rolling finishing temperature is 800-850 ℃.
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| CN101994063A (en) * | 2009-08-18 | 2011-03-30 | 宝山钢铁股份有限公司 | Weathering steel with yield strength of more than 700MPa and manufacturing method thereof |
| CN101792888A (en) * | 2010-03-17 | 2010-08-04 | 首钢总公司 | High-strength weathering steel and method for producing same |
| CN102409256A (en) * | 2011-11-09 | 2012-04-11 | 上海大学 | Method for preparing high-strength weathering steel based on carrier control technology |
| CN102644031B (en) * | 2012-05-17 | 2014-06-11 | 武汉钢铁(集团)公司 | Hot rolling container steel without punctiform surface defect and manufacturing method thereof |
| CN103343295B (en) * | 2013-05-21 | 2016-08-10 | 马钢(集团)控股有限公司 | The high intensity high-corrosion resistance steel board of a kind of yield strength 700MPa and production method thereof |
| CN105274446B (en) * | 2015-11-19 | 2017-12-29 | 攀钢集团西昌钢钒有限公司 | High chromium weathering steel and preparation method thereof |
| CN115109990B (en) * | 2021-03-17 | 2023-11-14 | 宝山钢铁股份有限公司 | High-strength hot-rolled weather-resistant steel plate and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004162119A (en) * | 2002-11-13 | 2004-06-10 | Nippon Steel Corp | Corrosion resistant steel with excellent haz toughness |
| JP2004360064A (en) * | 2003-05-15 | 2004-12-24 | Sumitomo Metal Ind Ltd | Steel material superior in beach weather resistance, and structure using it |
| CN1609257A (en) * | 2004-11-16 | 2005-04-27 | 武汉钢铁(集团)公司 | Acicular constituent high strength weathering resistant steel and producing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004162119A (en) * | 2002-11-13 | 2004-06-10 | Nippon Steel Corp | Corrosion resistant steel with excellent haz toughness |
| JP2004360064A (en) * | 2003-05-15 | 2004-12-24 | Sumitomo Metal Ind Ltd | Steel material superior in beach weather resistance, and structure using it |
| CN1609257A (en) * | 2004-11-16 | 2005-04-27 | 武汉钢铁(集团)公司 | Acicular constituent high strength weathering resistant steel and producing method thereof |
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