CN103451525B - Corrosion-resistant hot-rolled ribbed steel bar with yield strength not less than 600Mpa and production method thereof - Google Patents
Corrosion-resistant hot-rolled ribbed steel bar with yield strength not less than 600Mpa and production method thereof Download PDFInfo
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Abstract
The invention relates to a corrosion-resistant hot-rolled ribbed steel bar with yield strength not less than 600Mpa. The corrosion-resistant hot-rolled ribbed steel bar comprises the following components in percentage by weight: 0.17-0.28% of C, 0.50-0.90% of Si, 0.70-1.50% of Mn, 0.04-0.009% of P, not more than 0.015% of S, 0.08-0.15% of V and 0.025-0.045% of Nb. A production process comprises the following steps: desulfurizing molten iron; performing top and bottom combined blowing by virtue of a converter; refining by virtue of an argon station; refining by an LF (ladle furnace); performing continuous casting; stacking and cooling to a room temperature; heating a cast blank; performing rough rolling and finish rolling; naturally cooling to the room temperature. Compared with a steel bar with an epoxy resin coating, the corrosion-resistant hot-rolled ribbed steel bar has no defect of acceleration of corrosion rate caused by shedding of the coating; compared with the steel bar made of stainless steel, the corrosion-resistant hot-rolled ribbed steel bar has the advantage that the content of Cr is greatly reduced; compared with the ordinary steel bar, the corrosion-resistant hot-rolled ribbed steel bar has the advantage that the resistance to Cl ion corrosion is above 2 times higher than that of the ordinary steel bar; only the refining by virtue of the LF is additionally performed in an existing 400MPa grade steel bar process line, the increase in per ton of steel does not exceed 30 yuan, and then the production can be met.
Description
Technical field
The present invention relates to a kind of reinforcing bar and production method thereof, belong to a kind of Ribbed Bar and production method thereof particularly, be particularly useful for the corrosion-resistant hot rolled ribbed steel bar and the production method that are improved the yield strength >=600MPa of intensity by vanadium niobium micro-alloy intensifying technology.
Background technology
Along with domestic construction engineering is to the development of maximization, large load direction, operating efficiency, the energy-conserving and environment-protective problem of building structure cause common concern, more and more higher to the requirement of building iron use properties.HRB600 corrosion-resistant steel bar is the starting material manufacturing large project, high strength civil construction project.Compared with the HRB400 reinforcing bar used in a large number with current domestic construction industry, HRB600 corrosion-resistant steel bar is in plasticity decline situation by a small margin, and intensity level improves a lot; Yield strength improves 200MPa, and tensile strength improves 190MPa.HRB400 hot rolled ribbed steel bar is substituted with it in engineering construction, can saving steel 28%.Its application, can reduce the amount of reinforcement of construction in a large number, reduces difficulty of construction, improves construction quality, and increases substantially security and the work-ing life of engineering.
Domestic and international enquiry data shows, the reinforcement corrosion used in civil construction project is serious.The annual total corrosion loss of iron and steel of the U.S. accounts for 4.2% of gross national product (GDP).Be used in the reinforcing bar in Infrastructure, the year financial loss of its corrosion failure just reaches 1,500 hundred million dollars.Japan's transport economizes inspection 103 concrete sea port dock situations, finds the use harbour of more than 20 years, has sizable along muscle rust crack.Australia is investigated 62 seashore concrete structures, and the serious corrosion of the endurance issues finding seashore concrete structure all reinforcing bar is relevant.The loss that China is caused by reinforcement corrosion is also very serious, in the investigation carried out 27, East China, China south China harbour concrete structure, finds that the structure deteriorate caused because of steel bar corrosion accounts for 74%.1981, the result of 7 ~ 25 years Reinforced Concrete Docks investigation is used to show to l8 seat, steel bar corrosion or non-resistantly account for 89%.What occur that time of corrosion and destruction has is only 5 ~ 10 years, and these structures all do not reach design reference period requirement work-ing life substantially.Due to the steel bar corrosion that air and marine atmosphere cause, make the destruction of concrete structure, be acknowledged as the major cause causing coastal engineering destroying concrete structure.
China, in the sixties in last century, just starts the corrosion resistance nature research carrying out steel, has developed high durable structure iron, rail truck weather resisting steel, hull structure and the weathering steel such as offshore platform steel, steel for container kind so far.The resistance to atmospheric corrosion of weather-resistant steel plate improves more than 2 times than ordinary steel.But corrosion-resistant steel bar for building, application at home and abroad is at present seldom.
Through retrieval, Chinese Patent Application No. is the patent documentation of CN200910243828.9, discloses " a kind of high-strength low-alloy steel bar of Cl-corrosion resistant and production method ", but yield strength is 400MPa level, can not meet the demand of existing market.
Chinese Patent Application No. is the patent documentation of CN200710133597.7, disclose " a kind of containing vanadium high-strength corrosion-resistant steel bar steel and production technique thereof ", but yield strength is 400MPa level, can not meet the demand of existing market.
Summary of the invention
The yield strength that the present invention is directed to prior art existence is 400 MPa levels and can not meets the deficiency of the growth requirement in market, there is provided a kind of As rolled yield strength at more than 600MPa, anti-Cl ion etching ability is strong, and utilize current 400MPa level reinforcement rebar craft production line, also without the need to adding or transform the corrosion-resistant hot rolled ribbed steel bar of yield strength >=600MPa and the production method of any equipment.
Realize the measure of above-mentioned purpose:
The method of the corrosion-resistant hot rolled ribbed steel bar of production yield strength >=600MPa, its step:
1) desulfurizing iron: adopt spray magnesium powder sulfur removal technology, and control molten steel sulfur content [S]≤0.010%;
2) converter top bottom blowing: when tap to molten steel gross weight 1/4 time, ferro-silico-manganese is added according to 21 ~ 24 kgs/tonne of steel in molten steel, add silicon carbide according to 1.3 ~ 1.7 kgs/tonne of steel and carry out deoxidation, 1.8 ~ 2.5 kilograms of vanadium iron, 0.6 ~ 1.0 kilogram of ferro-niobium, 0.1 ~ 0.3 kilogram of carbon dust, 10 ~ 20 kilograms of ferrochrome, 2.0 ~ 18 kilograms of ferro tantalums are added by ton steel after deoxidation, and be no more than the chrome molybdenum of 1 kg/tonne of steel, when molten steel measure to molten steel gross weight 3/4 time, the alloy that add and carburelant must all add;
3) argon station is concise: trimming is also blown into argon gas, and argon flow amount is at 7 ~ 10Nm3/ minute, and argon blowing time is 3 ~ 15 minutes;
4) LF stove refining: be blown in stove that pressure is 0.5 ~ 0.8MPa, flow is the argon gas of 7.0 ~ 10.0Nm3/Min, argon blowing time is not less than 15 minutes, is not less than 10 minutes heat-up time;
5) continuous casting is carried out: adopt large tank long nozzle and crystallizer submersed nozzle to carry out molding casting; Middle bag covering slag adopts basic powder, and crystallizer protecting residue adopts low-carbon steel protecting slag; Middle Baogang water temp controls at 1530 ~ 1545 DEG C; Casting speed controls at 1.6 ~ 1.8 ms/min; Component and weight percent content are: C:0.17 ~ 0.28%, Si:0.50 ~ 0.90%, Mn:0.70 ~ 1.50%, P:0.04 ~ 0.09%, S≤0.015%, V:0.08 ~ 0.15%, Nb:0.025 ~ 0.045%, Tb:0.01 ~ 1.0%, all the other are Fe and impurity element;
6) cool: stacking is cooled to room temperature;
7) strand heating: control soaking zone temperature at 1150 ~ 1300 DEG C, be not less than 100 minutes heat-up time;
8) roughing and finish rolling: control roughing start rolling temperature at 1050 ~ 1150 DEG C; Control finish rolling finishing temperature and be no more than 1100 DEG C;
9) room temperature is naturally cooled to.
The effect of each element and master operation in the present invention
C: as the economical strengthening element of one, be dissolved in matrix, about can solution strengthening being played, therefore can not be too low, so select the scope of C 0.17 ~ 0.28%.
Si: the displacement strengthening element being a kind of cheapness, can significantly improve the intensity of steel, but Si too high levels can affect the welding property of steel, so select the scope of Si 0.5 ~ 0.9%.
Mn: the transformation temperature significantly reducing steel, by controlled rolling process, crystal grain thinning, the comprehensive over-all properties improving steel, but the too high meeting of Mn causes the hot deterioration of weldability and welded heat affecting zone, so select the scope of Mn 0.7 ~ 1.5%;
P: the corrosion resistance nature element improving steel, but too high levels reduces the plasticity of material by causing segregation, select the scope 0.04 ~ 0.09% of P.
S: as harmful element, requires that its content is more low better in theory, but considers situ production cost reason, select Fan Wei≤0.015% of S.
V: be microalloyed steel the most frequently used be also one of the most effective strengthening element.The effect of vanadium is the structure and properties affecting steel by forming VN, V (CN), and it is Precipitation in the ferrite of austenite grain boundary mainly, fining ferrite grains, increases the intensity of steel.After adding vanadium in steel, intensity can increase by 150 more than MPa.This effect of vanadium, the steel for hot rolling delivery seem particularly important.In the present invention, if the content of vanadium is lower than 0.12%, intensity can be produced and do not reach 600MPa rank, if higher than 0.15%, then reinforcing bar surplus capacity can be made excessive and cause alloy to waste, therefore being controlled 0.08 ~ 0.15%.
Nb: as crystal grain thinning and precipitation-strengthening element, can improve the intensity of steel, but time its content exceedes a certain amount of, its result no longer increases, so select the scope of Nb 0.025 ~ 0.045%.
Cr: the element improving anti-seawater corrosion ability, easily carries out enrichment at interior rusty scale, so select Cr≤1.0%;
Cu: improve corrosion resistance element, too high meeting causes intergranular segregation and causes embrittlement of grain boundaries, so select the scope of Cu 0.3% ~ 0.6%;
Ni: improve corrosion resistance element, improve the intensity of steel, its too high levels not only raises the cost, and easily enrichment and cause oxide skin to adhere to, so the scope of selection Ni is 0.1% ~ 0.4% under oxide skin;
Mo: improve corrosion resistance element, but after exceeding certain content, effect no longer increases, therefore select Mo≤0.5;
B: too high meeting causes intergranular segregation and causes embrittlement of grain boundaries, so select the scope of B 0.0001 ~ 0.005%;
Tb: improve corrosion resistance element, improve the intensity of steel, its too high levels not only raises the cost, and range of choice is 0.01 ~ 1.0%;
The control reason of main technique: the present invention utilizes vanadium Nb-microalloying to improve the intensity of reinforcing bar, adds the corrosive nature that corrosion-resistant element improves steel, improves matrix current potential, reaches reduction source of corrosion by increasing LF stove refinery practice minimizing steel inclusion.
Compared with existing Epoxy Resin Coated Steel Bars, without the need to brushwork epoxy resin coating, there is not coating shedding and the shortcoming causing erosion rate to accelerate in the present invention; Compared with stainless steel rebar, a large amount of cost pressure reducing interpolation precious alloy Cr and bring, just with the addition of a small amount of P, Cu, Ni, Cr microalloy element, and its total content < 2% improves corrosion resistance nature; Compared with regular reinforcement, its anti-Cl ion etching ability is more than 2 times of regular reinforcement, and on current 400MPa level reinforcement rebar craft production line, only attaching the refining of LF stove increases, the increase of ton steel is no more than 30 yuan, just can meet the production of 600MPa level corrosion-resistant steel bar.The present invention forbids water-cooled or get wet.
Accompanying drawing explanation
Accompanying drawing is metallographic structure figure of the present invention.
Embodiment
Below the present invention is described in detail:
Table 1 is the value list of various embodiments of the present invention and comparative example;
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example;
Table 3 is various embodiments of the present invention and the list of comparative example Performance Detection situation.
Various embodiments of the present invention are produced according to following steps:
1) desulfurizing iron: adopt spray magnesium powder sulfur removal technology, and control molten steel sulfur content [S]≤0.010%;
2) converter top bottom blowing: when tap to molten steel gross weight 1/4 time, ferro-silico-manganese is added according to 21 ~ 24 kgs/tonne of steel in molten steel, add silicon carbide according to 1.3 ~ 1.7 kgs/tonne of steel and carry out deoxidation, 1.8 ~ 2.5 kilograms of vanadium iron, 0.6 ~ 1.0 kilogram of ferro-niobium, 0.1 ~ 0.3 kilogram of carbon dust, 10 ~ 20 kilograms of ferrochrome, 2.0 ~ 18 kilograms of ferro tantalums are added by ton steel after deoxidation, and be no more than the chrome molybdenum of 1 kg/tonne of steel, when molten steel measure to molten steel gross weight 3/4 time, the alloy that add and carburelant must all add;
3) argon station is concise: trimming is also blown into argon gas, and argon flow amount is at 7 ~ 10Nm3/ minute, and argon blowing time is 3 ~ 15 minutes;
4) LF stove refining: be blown in stove that pressure is 0.5 ~ 0.8MPa, flow is the argon gas of 7.0 ~ 10.0Nm3/Min, argon blowing time is not less than 15 minutes, is not less than 10 minutes heat-up time;
5) continuous casting is carried out: adopt large tank long nozzle and crystallizer submersed nozzle to carry out molding casting; Middle bag covering slag adopts basic powder, and crystallizer protecting residue adopts low-carbon steel protecting slag; Middle Baogang water temp controls at 1530 ~ 1545 DEG C; Casting speed controls at 1.6 ~ 1.8 ms/min;
6) cool: stacking is cooled to room temperature;
7) strand heating: control soaking zone temperature at 1150 ~ 1300 DEG C, be not less than 100 minutes heat-up time;
8) roughing and finish rolling: control roughing start rolling temperature at 1050 ~ 1150 DEG C; Control finish rolling finishing temperature and be no more than 1100 DEG C;
9) room temperature is naturally cooled to.
The chemical composition (wt%) of table 1 various embodiments of the present invention and comparative example
Table 2 various embodiments of the present invention and comparative example technique significant parameter control list ()
Table 2 various embodiments of the present invention and comparative example controlled rolling process significant parameter control (two)
Table 3 various embodiments of the present invention and the list of comparative example mechanical properties test Comparative result
Corrosion rate test conditions in table 3: carry out week leaching experiment, experimental solutions is 3%NaCl, experimental temperature 45 ± 2 DEG C, relative humidity 70 ± 5%, soak wheel speed 1 week to enclose/60 minutes, etching time is respectively 216 hours (corrosion rate 1) and 288 hours (corrosion rate 2).
As can be seen from Table 3, the composition of the present invention's design all can meet 600Mpa corrosion-resistant steel bar performance, and the more current common 600Mpa level reinforcing bar of its corrosion rate reduces more than 70%, and drawn test, break on mother metal, illustrate that welding property is good.
The present invention forbids with water cooling or touches water.
Above-described embodiment is only the best and exemplifies, and is not the restriction to embodiments of the present invention.
Claims (1)
1. the production method of the corrosion-resistant hot rolled ribbed steel bar of yield strength >=600MPa, its step:
1) desulfurizing iron: adopt spray magnesium powder sulfur removal technology, and control molten steel sulfur content [S]≤0.010%;
2) converter top bottom blowing: when tap to molten steel gross weight 1/4 time, ferro-silico-manganese is added according to 21 ~ 24 kgs/tonne of steel in molten steel, add silicon carbide according to 1.3 ~ 1.7 kgs/tonne of steel and carry out deoxidation, 1.8 ~ 2.5 kilograms of vanadium iron, 0.6 ~ 1.0 kilogram of ferro-niobium, 0.1 ~ 0.3 kilogram of carbon dust, 10 ~ 20 kilograms of ferrochrome, 2.0 ~ 18 kilograms of ferro tantalums are added by ton steel after deoxidation, and be no more than the chrome molybdenum of 1 kg/tonne of steel, when molten steel measure to molten steel gross weight 3/4 time, the alloy that add and carburelant must all add;
3) argon station is concise: trimming is also blown into argon gas, and argon flow amount is at 7 ~ 10Nm
3/ minute, argon blowing time is 3 ~ 15 minutes;
4) LF stove refining: be blown in stove that pressure is 0.5 ~ 0.8MPa, flow is 7.0 ~ 10.0Nm
3the argon gas of/min, argon blowing time is not less than 15 minutes, is not less than 10 minutes heat-up time;
5) continuous casting is carried out: adopt large tank long nozzle and crystallizer submersed nozzle to carry out molding casting; Middle bag covering slag adopts basic powder, and crystallizer protecting residue adopts low-carbon steel protecting slag; Middle Baogang water temp controls at 1530 ~ 1545 DEG C; Casting speed controls at 1.6 ~ 1.8 ms/min; Strand component and weight percent content are: C:0.17 ~ 0.28%, Si:0.50 ~ 0.90%, Mn:0.70 ~ 1.50%, P:0.04 ~ 0.09%, S≤0.015%, V:0.08 ~ 0.15%, Nb:0.025 ~ 0.045%, Tb:0.01 ~ 1.0%, all the other are Fe and impurity element;
6) cool: stacking is cooled to room temperature;
7) strand heating: control soaking zone temperature at 1150 ~ 1300 DEG C, be not less than 100 minutes heat-up time;
8) roughing and finish rolling: control roughing start rolling temperature at 1050 ~ 1150 DEG C; Control finish rolling finishing temperature and be no more than 1100 DEG C;
9) room temperature is naturally cooled to.
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| CN103898403B (en) * | 2014-04-09 | 2016-06-29 | 武汉钢铁(集团)公司 | The hot-rolled ribbed anti-seismic steel bar of HRB500 level |
| CN103898407B (en) * | 2014-04-09 | 2016-07-06 | 武汉钢铁(集团)公司 | 600MPa hot rolled ribbed bars and preparation method thereof |
| CN104233096A (en) * | 2014-09-20 | 2014-12-24 | 唐山市德龙钢铁有限公司 | Method used for producing 400 MPa level hot rolled ribbed steel bar and capable of reducing alloy cost |
| CN104451410B (en) * | 2014-12-18 | 2017-04-12 | 马钢(集团)控股有限公司 | Steel for 600MPa-level high-strength steel bars and thermal mechanical rolling method thereof |
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| CN107723603A (en) * | 2017-11-29 | 2018-02-23 | 安徽工业大学 | Yield strength 500MPa levels corrosion-resistant steel bar and manufacture method |
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| CN112195394B (en) * | 2020-09-01 | 2022-02-18 | 陕钢集团产业创新研究院有限公司 | MG600 grade anchor rod steel with yield ratio less than or equal to 0.8 and production method thereof |
| CN113061805B (en) * | 2021-03-12 | 2022-05-03 | 盐城市联鑫钢铁有限公司 | 600 MPa-grade corrosion-resistant rare earth reinforcing steel bar and production method thereof |
| CN114058770A (en) * | 2021-11-02 | 2022-02-18 | 阳春新钢铁有限责任公司 | Production method of HRB600E high-strength anti-seismic steel bar |
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