CN101144137A - Steel for niobium-containing high-strength corrosion-resistant steel bar and rolling technique thereof - Google Patents
Steel for niobium-containing high-strength corrosion-resistant steel bar and rolling technique thereof Download PDFInfo
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- CN101144137A CN101144137A CNA2007101335996A CN200710133599A CN101144137A CN 101144137 A CN101144137 A CN 101144137A CN A2007101335996 A CNA2007101335996 A CN A2007101335996A CN 200710133599 A CN200710133599 A CN 200710133599A CN 101144137 A CN101144137 A CN 101144137A
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Abstract
The present invention discloses niobium containing steel with high intensity and corrosion prevention used for reinforced bars, and the production process thereof. According to the weight percentage (wt percent), the steel is composed of the alloying elements of 0.17-0.24 percent of C, 0.55-0.75 percent of Si, 1.35-1.50 percent of Mn, 0.02-0.04 percent of Nb, 0.04-0.10 percent of Re, and Fe and impurity element for the residual. Billet steel is continuously cast after the smelting in an ordinary steel type smelting method, and the rolling process has the parameters that the heating temperature is 1100-1200 DEG C, the opening rolling temperature is 950 to 1050 DEG C, and the finish rolling temperature is 900-1100 DEG C; the temperature of an upper cooling bed is 850-950 DEG C. Compared with the ordinary reinforced bars, the present invention has better corrosion proof performance in the environments of chlorine salt and industrial atmosphere, etc., on the other hand, the reinforced bars of the present invention have low cost and simple production process.
Description
Technical field
The invention belongs to high-strength corrosion-resistant steel and production technique thereof, particularly be used for the high-strength corrosion-resistant steel and the production technique thereof of reinforcing bar.
Background technology
Along with science and technology development; environmental protection requirement is had higher requirement to engineering materials; so the corrosion resistance nature of reinforcing bar has become the main research topic of industrialized country; the various corrosion-resistant steel bars, the reinforcing bar of anti-marquis that improve the work-ing life of reinforcing bar constantly are applied; by in reinforcing bar, adding corrosion-resistant element or adopting modes such as coating, rust inhibitor, the corrosion-resistant steel bar of developing, producing other reinforcing bar of anti-marquis of different intensity scale and use at special occasions.
For high strength cast iron, regulation is arranged among the GB GB1499-1998, and its yield strength can reach 400MPa, 500MPa level, at present to produce the 400MPa level, its predominant quantity percentage concentration is: C≤0.25%, Si≤0.80%, Mn≤1.60%, P, S≤0.045%, Ceq≤0.55%, Ceq=C+Mn/6+ (Cr+V+Mo)/5+ (Cu+Ni)/15 as required, also can add elements such as V, Nb, Ti in the steel.
It is C=0.10-0.12% that the predominant quantity percentage concentration has been studied by Jinan Iron And Steel Company, Cr=0-0.78%, Ni=0.32-0.67%, Mo=0-0.52%, V=0-0.06%, the low carbon high-strength degree corrosion-resistant steel bar of Cu=0.30-0.36% (" special steel " 2004 the 6th phases), but contain alloying elements such as higher Cr, Cu, Ni, Mo in the steel, not only improve production cost, also increased the difficulty of producing simultaneously.
Can be divided into weather resisting steel about corrosion-resisting steel is weathering steel and Seawate-corrosive-resisting steel, there is the relevant standard of corrosion-resisting steels such as freight container, rail truck, oil derrick, harbour building, production vessel and chemical petroleum equipment in China at present, as: GB/T 4171-2000, high weather-proof structure iron, GB/T 18982-2003 freight container is with anti-corrosion steel plate and steel band, and the corrosion-resistant structure of Baosteel company standard Q/BQB 340-2003 is with hot continuous-milling steel plate and steel band etc.Weathering steel generally is that Xiang Gangzhong adds anti-corrosion elements such as a certain amount of Cu, P, mainly contains two series of Cu-P, Cu-P-Cr-Ni, and 295MPa, 345MPa, three intensity ranks of 390MPa are arranged.And the Seawate-corrosive-resisting steel of domestic present production is to introduce the external sophisticated steel grade trade mark basically, mainly contains: the Mariner steel of U.S. Cu-P-Ni series, the Mariloy steel of Japanese Cr-Cu-Mo series etc.But the Cu element in the corrosion-resisting steel can cause steel " hot-short ", reduces the hot workability of steel, will produce map cracking at steel surface and promptly chaps if processing parameter control is improper in heating, rolling process; P will improve the brittle transition temperature of steel in steel, make steel easily produce " cold short ", reduce the plasticity and toughness of steel, particularly reduce the low-temperature impact toughness of steel, and worsen the welding property of steel.In recent years, have required high strength in order to make corrosion-resisting steel when guaranteeing the good corrosion resistance energy, domestic and international research personnel have carried out the improvement of a large amount of production technique aspects.Having released the trade mark as France is APS20A Seawate-corrosive-resisting steel (Cr
4Al) new production process, this technology is when smelting the molten steel carbon content to be strict controlled in below 0.12%, abandon the smelting technology that in molten steel, adds Cu, P, but in molten steel, added 0.70～1.00% Al alloying element, and 3.9～4.3% Cr alloying element.Though adopt the corrosion-resisting steel of this explained hereafter to overcome Cu, deficiency that P corrosion-resisting steel intensity is low, the processing parameter of the desired harshness of this technology and higher production cost make it be subjected to certain restriction aspect applying.
Chinese patent 200610098398.2, denomination of invention are " a kind of production technique of anti-corrosion carbon constructional steel ", and the applying date is on December 18th, 2006.This invention relates to a kind of corrosion-resistant structural carbon steel that adds rare earth, by following alloying element by weight percentage (wt%) form: C≤0.21%; Si≤0.35%; 0.80 ~ 1.20%Mn; 0.015% ~ 0.035P%, Re≤0.07%, all the other are Fe and impurity element, 3.5 〉=Re/S 〉=2.0, [0] solid solution is 50～80ppm.This invention utilizes rare earth element to make that sulfide inclusion carries out sex change in the steel, forms rare-earth sulfide, and it is spherical that inclusion is become by strip of sheet, and its spot corrosion induced sensitivity descends, thereby the solidity to corrosion of steel is improved.The pit propagation rate mean level (ML) of corrosion-resistant structural carbon steel lowers 15% than the carbon structural steel of same level.With Cu-P, Cu-P-Cr-Ni, Cr-Cu-Mo is that corrosion-resisting steel is compared, and this invention can reduce cost, and improves toughness and welding property, but the corrosion resisting property deficiency.
Flourish along with China's building trade, more and more higher to the requirement of the performance of reinforcing bar especially corrosion resistance nature, the exploitation of high-strength corrosion-resistant steel that is used for reinforcing bar is extremely urgent.
Summary of the invention
Technical problem to be solved by this invention provides the low corrosion resistance nature of a kind of cost higher high-strength corrosion-resistant steel bar steel and rolling technology thereof.
The technical scheme of technical solution problem of the present invention is: a kind of steel for niobium-containing high-strength corrosion-resistant steel bar, by following alloying element by weight percentage (wt%) form: 0.17-0.24%C, 0.55-0.75%Si, 1.35-1.50%Mn, 0.02-0.04%Nb, 0.04-0.10%Re, all the other are Fe and impurity element.
Used Re is a mishmetal, wherein cerium weight percent (wt%)〉45%
A kind of rolling technology of steel for niobium-containing high-strength corrosion-resistant steel bar, 1100～1200 ℃ of Heating temperatures, 1000 ± 50 ℃ of start rolling temperatures, 900～1100 ℃ of finishing temperatures, 850～950 ℃ of last cold bed temperatures.
Steel of the present invention is to utilize to produce regular reinforcement desired raw material, equipment and smelt conventional production process, when smelting, adopt currently known methods, C in the steel, Mn are adjusted to 0.17～0.24%C, 1.35-1.50%Mn respectively, P in the steel, S are reduced to below 0.030%, operating method is added several known alloying elements in molten steel routinely, and adopts technology for controlled cooling to be rolled.
Steel grade of the present invention only need be by the mentioned component scope, and smelting technology can be realized routinely in converter, electric furnace or other smelting furnace, and can produce high-strength corrosion-resistant steel bar under the condition that adopts common rolling technology and controlled chilling on the common merchant bar mill.
Used rare earth is a mishmetal, cerium＞45% wherein, Re low price and have good corrosion resistance.The reason that Re has the good corrosion resistance energy has: (1) Re has purified steel quality, and O in the molten steel, S content are reduced greatly, has reduced to be mingled with total amount in the steel; (2) Re can be that the little rare earth of erosion rate is mingled with big being mingled with of erosion rate in the molten steel (as MnS) sex change, reduces the inner film micro area galvanic corrosion of steel matrix, and energy nodularization MnS, improves the pinning effect of rusty scale and steel matrix.(3) Re joins and contains in the P steel, and the macrosegregation of P is reduced.
The effect of each element has also effectively been brought into play in the combination of employing Nb, Re.Nb exists with the displacement solute atoms in steel, Nb atomic ratio iron atom size is big, easily poly-partially on dislocation line, climb of dislocation is produced the intensive effect of dragging, the recrystallize forming core is suppressed, recrystallize is had the intensive interception, improved austenitic recrystallization temperature, thereby reach the purpose of refine austenite crystal grain, grain refining can not only improve the obdurability of steel, improves the comprehensive mechanical property of steel; And can improve the erosion rate at corrosion initial stage, and quicken to stablize the kinetics that rusty scale α-2FeOOH forms, thus improve the corrosion resistance nature of steel.In addition, the solubleness of Nb in ferro element is greater than the solubleness in rusty scale, and can improve the electrochemical potential of steel matrix.Therefore, the combination of Nb, Re can improve the corrosion resistance nature of steel.
Controlled cooling technology is promptly by the reasonable control to process for cooling parameter (Heating temperature, start rolling temperature, finishing temperature, last cold bed temperature etc.), for the phase transformation of steel is got ready, and by controlling the speed of cooling of phase transition process, obtain the comparatively tiny grain structure of one deck at steel surface, thereby improve and improve the comprehensive mechanical property and the corrosion resistance nature of steel.
The hot-rolled reinforced bar performance that adopts the control refrigeration technique to produce with this steel can reach following requirement: yield strength Rel (Rp0.2) 〉=400MPa, tensile strength Rm 〉=570MPa, elongation A% 〉=14%.And compare with regular reinforcement and under environment such as villaumite, industrial atmosphere, to have better corrosion resistance nature.Use high-strength corrosion-resistant steel bar of the present invention can improve the erosion resistance of building structure steel, improve the weather resistance and the security of its use with steel.On the other hand, the production cost of reinforcing bar of the present invention is low, production technique is simple.Therefore have good market outlook.
Embodiment
Embodiment 1-3 all adopts intermediate frequency furnace to smelt, and is rolling on φ 300mm merchant bar mill, bar gauge φ 16mm.
Salt-fog test is the corrosion behavior of simulation material in the atmospheric environment of coastal chloride ion contamination, and soaking test week is that simulation material is containing SO
2The industrial atmosphere environment under corrosion behavior.Adopt relative erosion rate to come comparison steel of the present invention and the corrosion resistance of compared steel (HRB400) under these two kinds of test conditionss, the corrosion rate of the corrosion rate/compared steel (HRB400) of relative corrosion rate=steel of the present invention, corrosion rate adopt weight-loss method to calculate.The low more corrosion resistance that shows of corrosion rate is strong more relatively,
Table 1: salt-fog test and week are soaked the condition of test
| Salt-fog test | Week is soaked test | |
| Testing installation | FQY010 type salt fog cabinet | F1-65 type week is soaked trier |
| Touchstone | GB10125-97 | TB/T2375-93 |
| Corrosive medium | 5％NaCl | 0.01MNaHSO 3, added 0.02MNaHSO in 3L/ days 3 |
| PH value | 6.5～7.2 | 4.4～4.8 |
| Temperature (℃) | 35±2 | 45±2 |
| Relative humidity, % | 60～80 | |
| Time (h) | 96 | 96 |
Annotate: soaking the testing campaign cycle week is 60min, and wherein infiltrating time is 12 ± 1.5min.
Embodiment 1:
Various element wt compositions in the molten steel are adjusted into respectively: C=0.2%, Si=0.61%, Mn=1.49%, Nb=0.037%, Re=0.077%, P=0.025%, S=0.014%, Re is a mishmetal, cerium=47% wherein, in rolling process, Heating temperature is 1160-1190 ℃, start rolling temperature is 990-1030 ℃, and finishing temperature is 970-1100 ℃; In refrigerating work procedure, last cold bed temperature is 890-940 ℃.
Embodiment 2:
Various element wt compositions in the molten steel are adjusted into respectively: C=0.23%, Si=0.61%, Mn=1.5%, Nb=0.031%, Re=0.045%, P=0.024%, S=0.014%, Re is a mishmetal, cerium=49% wherein, in rolling process, Heating temperature is 1140-1170 ℃, start rolling temperature is 990-1010 ℃, and finishing temperature is 960-1100 ℃; In refrigerating work procedure, last cold bed temperature is 880-920 ℃.
Embodiment 3:
Various element wt compositions in the molten steel are adjusted into respectively: C=0.24%, Si=0.56%, Mn=1.38%, Nb=0.03%, Re=0.061%, P=0.026%, S=0.016%, Re is a mishmetal, cerium=51.2% wherein, in rolling process, Heating temperature is 1140-1160 ℃, start rolling temperature is 980-1010 ℃, and finishing temperature is 960-1000 ℃; In refrigerating work procedure, last cold bed temperature is 880-920 ℃.
Embodiment 1-3 corrosion resistance nature, mechanical property see Table 2.
| Embodiment 1 | Embodiment 2 | Embodiment 3 | |
| Salt-fog test | 50 | 60 | 58 |
| Week is soaked test | 54 | 64 | 50 |
| Rel，MPa | 455/460/455 | 460/464/461 | 450/460/464 |
| Rm，MPa | 640/646/650 | 646/650/644 | 650/656/660 |
| A，％ | 19/20/20 | 20/20/19 | 20/19/19 |
Test-results show the prepared steel of embodiment 1-3 in bar in chlorine salt solution, contain SO
2The industrial atmosphere environment under have higher corrosion resistance than HRB400 steel.
Claims (3)
1. steel for niobium-containing high-strength corrosion-resistant steel bar, by following alloying element by weight percentage (wt%) form: 0.17-0.24%C, 0.55-0.75%Si, 1.35-1.50%Mn, 0.02-0.04%Nb, 0.04-0.10%Re, all the other are Fe and impurity element.
2. a kind of steel for niobium-containing high-strength corrosion-resistant steel bar according to claim 1 is characterized in that: described Re is a mishmetal, wherein the weight percent of cerium (wt%)＞45%.
3. the rolling technology of a kind of steel for niobium-containing high-strength corrosion-resistant steel bar according to claim 1 is characterized in that: 1100～1200 ℃ of Heating temperatures, 1000 ± 50 ℃ of start rolling temperatures, 900～1100 ℃ of finishing temperatures, 850～950 ℃ of last cold bed temperatures.
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| CNB2007101335996A CN100554478C (en) | 2007-09-22 | 2007-09-22 | A kind of steel for niobium-containing high-strength corrosion-resistant steel bar and rolling technology thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534390A (en) * | 2011-12-15 | 2012-07-04 | 江苏省沙钢钢铁研究院有限公司 | Corrosion-resistant twisted steel and production method thereof |
| CN110735086A (en) * | 2019-10-14 | 2020-01-31 | 盐城市联鑫钢铁有限公司 | control process for solving problem of unobvious yield of niobium-containing deformed steel bars |
| CN111020379A (en) * | 2019-11-22 | 2020-04-17 | 龙南龙钇重稀土科技股份有限公司 | Rare earth composite reinforced hot-rolled steel bar and preparation method thereof |
| CN111621707A (en) * | 2020-06-28 | 2020-09-04 | 马鞍山钢铁股份有限公司 | Steel for high-ductility cold-rolled steel bar CRB680H and production process thereof |
| CN114657447A (en) * | 2020-12-22 | 2022-06-24 | 上海大学 | Rare earth-containing corrosion-resistant hot-rolled ribbed steel bar |
| CN115044829A (en) * | 2022-05-25 | 2022-09-13 | 芜湖新兴铸管有限责任公司 | Corrosion-resistant steel and preparation method thereof |
-
2007
- 2007-09-22 CN CNB2007101335996A patent/CN100554478C/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534390A (en) * | 2011-12-15 | 2012-07-04 | 江苏省沙钢钢铁研究院有限公司 | Corrosion-resistant twisted steel and production method thereof |
| CN102534390B (en) * | 2011-12-15 | 2013-09-04 | 江苏省沙钢钢铁研究院有限公司 | Corrosion-resistant reinforced steel bar and production method thereof |
| CN110735086A (en) * | 2019-10-14 | 2020-01-31 | 盐城市联鑫钢铁有限公司 | control process for solving problem of unobvious yield of niobium-containing deformed steel bars |
| CN111020379A (en) * | 2019-11-22 | 2020-04-17 | 龙南龙钇重稀土科技股份有限公司 | Rare earth composite reinforced hot-rolled steel bar and preparation method thereof |
| CN111621707A (en) * | 2020-06-28 | 2020-09-04 | 马鞍山钢铁股份有限公司 | Steel for high-ductility cold-rolled steel bar CRB680H and production process thereof |
| CN111621707B (en) * | 2020-06-28 | 2022-02-08 | 马鞍山钢铁股份有限公司 | Steel for high-ductility cold-rolled steel bar CRB680H and production process thereof |
| CN114657447A (en) * | 2020-12-22 | 2022-06-24 | 上海大学 | Rare earth-containing corrosion-resistant hot-rolled ribbed steel bar |
| CN115044829A (en) * | 2022-05-25 | 2022-09-13 | 芜湖新兴铸管有限责任公司 | Corrosion-resistant steel and preparation method thereof |
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Assignee: Anhui BRC & Ma Steel Weldmesh Co., Ltd. Assignor: Ma'anshan Iron and Steel Co., Ltd. Contract record no.: 2011340000089 Denomination of invention: Steel for niobium-containing high-strength corrosion-resistant steel bar and rolling technique thereof Granted publication date: 20091028 License type: Exclusive License Open date: 20080319 Record date: 20110707 |
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Address after: 243003 Department of intellectual property right of Hunan West Road No. 8 technology center, Ma'anshan City, Anhui Province Patentee after: Ma'anshan Iron and Steel Co., Ltd. Address before: 243003 technical center, 8 West Hunan Road, Ma'anshan, Anhui Patentee before: Ma'anshan Iron and Steel Co., Ltd. |
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Address after: 243003 8 Jiuhua Road, Yushan, Ma'anshan, Anhui Patentee after: Ma'anshan Iron and Steel Co., Ltd. Address before: 243003 intellectual property department, technology center, No. 8 Hunan West Road, Yushan, Ma'anshan, Anhui Patentee before: Ma'anshan Iron and Steel Co., Ltd. |
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