CN103834871A - 500MPa-level corrosion-resistant Cr-contained reinforcing steel bar and rolling process thereof - Google Patents
500MPa-level corrosion-resistant Cr-contained reinforcing steel bar and rolling process thereof Download PDFInfo
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- CN103834871A CN103834871A CN201410104201.6A CN201410104201A CN103834871A CN 103834871 A CN103834871 A CN 103834871A CN 201410104201 A CN201410104201 A CN 201410104201A CN 103834871 A CN103834871 A CN 103834871A
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Abstract
The invention discloses a 500MPa-level corrosion-resistant Cr-contained reinforcing steel bar and a rolling process thereof. The reinforcing steel bar comprises the following components in percentage by weight: 0.05-0.12% of C, 8-10% of Cr, 0.1-0.3% of Cu, 0.1-0.15% of Ni, 1-1.5% of Mn, less than or equal to 0.015% of N, less than or equal to 0.03% of P, less than or equal to 0.035% of S, 0.2-0.5% of Si and the balance of Fe and unavoidable impurities. The rolling process of the reinforcing steel bar is realized under the conditions that the heating furnace temperature is 1150-1250 DEG C, the initial rolling temperature is 1000-1100 DEG C, the final rolling temperature is 950-1150 DEG C, and the upper cooling bed temperature is 900-1000 DEG C. The 500MPa-level corrosion-resistant Cr-contained reinforcing steel bar can be smelted according to the conventional process, and the phase change of steel is controlled through the rolling process, so that a layer of tissues with fine crystal grains is obtained on the surface of a steel material, and meanwhile, the aim of improving the mechanical properties and corrosion resistance of the steel material is achieved; the produced reinforcing steel bar has the yield strength Rel of larger than or equal to 500MPa, the tensile strength Rm of larger than or equal to 630MPa and the elongation A% of larger than or equal to 15%; the corrosion resistance of the reinforcing steel bar is 4-6 times that of a common HRB 500 reinforcing steel bar.
Description
Technical field
The present invention relates to a kind of 500MPa level corrosion-resistant containing Cr reinforcing bar and rolling technology thereof, belong to technical field of ferrous metallurgy.
Background technology
Reinforcing bar is the basic material of modern architecture, is widely used in the engineering constructions such as house, bridge, road, and its performance directly affects life-span and the security of concrete member.At present, China is in the urbanization high speed development stage, and real estate and infrastructure construction are flourish, and output and the consumption of reinforcing bar all rank first in the world, and within 2012, China's crude steel output exceedes 7.16 hundred million tons, and wherein reinforcing bar output exceedes 1.75 hundred million tons.The smelting need of production of reinforcing bar consumes mass energy and environment protection is brought to negative impact; along with the increase of Environmental Protection in China pressure; by increasing reinforced steel bar strength and corrosion resisting property; thereby reduce steel using amount and the technology that increases the service life to reach effects of energy saving and emission reduction, more and more receive the concern of metallurgical scientific worker and government's industry.
Before the nineties in 20th century, West Europe, North America and Japan have just more been used high strength cast iron, adopt high strength cast iron can obviously reduce steel using amount and cost of labor remarkable betterment works quality, there is good Social benefit and economic benefit, and China for a long time the intensity of the leading reinforcing bar of concrete structure be 335Mpa, along with the promulgation of industry standard, intensity is that the III grade reinforcing steel of 400MPa is just used gradually, this causes the serious waste of resource, the energy than an external whole low strength grade; Reinforcement corrosion meeting seriously reduces the work-ing life of reinforcing bar, causes concrete structure premature failure.The direct economic loss that China in 2010 causes because of corrosion is just up to 1.2 trillion Renminbi, accounts for 3% of GDP then.Because corrosion resisting property reinforcing bar can effectively extend the life-span of concrete structure and reduce later maintenance cost, therefore, in the urgent need to developing a kind of reinforcing bar that has high strength, corrosion resisting property concurrently and be easy to popularization.
Summary of the invention
One object of the present invention is to provide a kind of 500MPa level corrosion-resistant containing Cr reinforcing bar, and it is good and have good mechanical property, fatigue property and a welding property that the yield strength of this reinforcing bar is greater than 500MPa, corrosion resisting property.
Another object of the present invention is to provide the rolling technology of above-mentioned reinforcing bar.
For realizing above-mentioned first object, the technical solution used in the present invention is:
A kind of 500MPa level is corrosion-resistant containing Cr reinforcing bar, and the compositions in weight percentage of this reinforcing bar is:
0.05～0.12%C, 8～10%Cr, 0.1～0.3%Cu, 0.1～0.15%Ni, 1～1.5%Mn, N≤0.015%, P≤0.03%, S≤0.035%, 0.2～0.5%Si, all the other are Fe and inevitable impurity.
Further, the compositions in weight percentage of described reinforcing bar is:
0.08～0.10%C, 8～9%Cr, 0.2～0.3%Cu, 0.12～0.15%Ni, 1.2～1.5%Mn, N≤0.010%, P≤0.025%, S≤0.025%, 0.2～0.4%Si, all the other are Fe and inevitable impurity.
For realizing above-mentioned second object, the technical solution used in the present invention is:
The corrosion-resistant rolling technology containing Cr reinforcing bar of 500MPa level, the furnace temp of this technique is 1150～1250 ℃, and start rolling temperature is 1000～1100 ℃, and finishing temperature is 950～1150 ℃, and upper cold bed temperature is 900～1000 ℃.
Each component effect of reinforcing bar of the present invention is as follows:
C is strengthening element important in steel, forms sosoloid tissue in steel, improves the intensity of steel, and carbon content is higher, and intensity, the hardness of steel are higher, but plasticity, toughness can decrease.For containing the corrosion-resistant steel of chromium, due to C and Cr avidity very strong, too high C content can reduce the Cr content in sosoloid, causes the reduction of corrosion resisting property, therefore in the present invention, the scope of C content is elected as: 0.05～0.12%.
Cr is solidity to corrosion element, can significantly increase steel corrosion resisting property, but Cr is ferrite former, and too high Cr content can make ferrite content in steel increase, and causes strength degradation, occurs quenching structure, is unfavorable for organizational controls.In the present invention, Cr content is controlled at 8～10%.
Cu is solidity to corrosion element, contributes to the raising of steel corrosion resisting property, but in its steel, too much Cu can cause the reduction of material plasticity, causes hot rolling cracking.In the present invention, Cu content is controlled at 0.1～0.3%.
Mn is strengthening element, can significantly strengthen the intensity of steel, and strong with the avidity of S, lower the harm of S, but too high Mn can reduce the plasticity of steel by producing sulfide inclusion.In the present invention, Mn content is controlled at 1～1.5%.
P can improve intensity, hardness and the corrosion resisting property of steel, but segregation is serious in steel, can significantly reduce steel mechanics performance, and in the present invention, P content is controlled in 0.03%.
S easily causes hot-short, causes the generation of crackle in the operation of rolling, and in steel, MnS is mingled with the origin that also can become corrosion simultaneously, seriously reduces steel corrosion resisting property, and therefore in the present invention, S content is controlled in 0.035%.
Si is strengthening element, improves the intensity of steel by solution strengthening, simultaneously effectively deoxidation reduce steel inclusion of Si.In the present invention, Si content range is controlled at 0.2～0.5%.
N has solution strengthening effect, can effectively improve intensity and the hardness of steel, but the toughness of too high N content meeting severe exacerbation steel, and cause notch sensitivity to increase.In the present invention, N content is controlled in 0.015.
The present invention is by C in steel, Cr, Cu, Ni, Si, Mn, P, S, N component concentration is adjusted into respectively 0.05～0.12%C, 8～10%Cr, 0.1～0.3%Cu, 0.1～0.15%Ni, 0.2～0.5%Si, 1～1.5%Mn, P≤0.03%, S≤0.035%, N≤0.015%, in converter, in electric furnace or other smelting furnace, smelt according to common process, on common merchant bar mill, adopt Controlled cooling process by selecting suitable Heating temperature, start rolling temperature, finishing temperature and upper cold bed temperature are rolled, can control the phase transformation of steel, obtain the tiny tissue of one deck crystal grain at steel surface, reach the object of simultaneously improving steel mechanics performance and corrosion resisting property.
The hot-rolled reinforced bar performance that the present invention produces can reach following requirement: yield strength R
el>=500MPa, tensile strength R
m>=630MPa, elongation A%>=15%; Corrosion resisting property is 4～6 times (erosion rate of reinforcing bar of the present invention is 175～220 μ m/year, and the erosion rate of common HRB500 reinforcing bar is 940～1050 μ m/year) of common HRB500 reinforcing bar.
Embodiment
Below in conjunction with embodiment, the present invention is further detailed explanation.
The weight percent content of the each component of reinforcing bar of embodiments of the invention 1～10 and comparative example 1～2 is in table 1.Embodiment 1～10 all adopts 50Kg vacuum induction furnace smelting, rolling on Ф 300mm merchant bar mill, bar gauge Ф 16mm.Comparative example 1, comparative example 2 are industrial common HRB500 reinforcing bar.
Salt spray corrosion test carries out in Q-fog cyclic corrosion case, and test period is 672 hours, and temperature is 35 ℃, and corrosive medium adopts the NaCl solution that concentration is 5%.
The main technologic parameters of the rolling technology of each embodiment and comparative example in table 2, mechanics and corrosion resisting property in table 3.
The weight percent content of each component in the each embodiment of table 1 and comparative example
| Example | C | Cr | Cu | Mn | P | S | Si | N |
| Embodiment 1 | 0.05 | 9.1 | 0.10 | 1.0 | 0.012 | 0.012 | 0.21 | 0.010 |
| Embodiment 2 | 0.10 | 8.0 | 0.11 | 1.2 | 0.030 | 0.015 | 0.23 | 0.007 |
| Embodiment 3 | 0.11 | 8.5 | 0.15 | 1.4 | 0.011 | 0.011 | 0.20 | 0.005 |
| Embodiment 4 | 0.06 | 9.6 | 0.25 | 1.1 | 0.012 | 0.010 | 0.31 | 0.015 |
| Embodiment 5 | 0.07 | 8.3 | 0.18 | 1.2 | 0.014 | 0.035 | 0.25 | 0.012 |
| Embodiment 6 | 0.08 | 8.7 | 0.30 | 1.4 | 0.020 | 0.013 | 0.22 | 0.011 |
| Embodiment 7 | 0.05 | 9.5 | 0.25 | 1.3 | 0.016 | 0.018 | 0.50 | 0.008 |
| Embodiment 8 | 0.08 | 10.0 | 0.27 | 1.4 | 0.017 | 0.020 | 0.34 | 0.014 |
| Embodiment 9 | 0.09 | 9.7 | 0.22 | 1.5 | 0.015 | 0.011 | 0.40 | 0.012 |
| Embodiment 10 | 0.12 | 9.4 | 0.20 | 1.2 | 0.010 | 0.014 | 0.28 | 0.013 |
| Comparative example 1 | 0.20 | 0.010 | 0.007 | 1.5 | 0.020 | 0.020 | 0.35 | 0.024 |
| Comparative example 2 | 0.21 | 0.013 | 0.009 | 1.4 | 0.026 | 0.019 | 0.67 | 0.025 |
The main technologic parameters of the rolling technology of the each embodiment of table 2 and comparative example
Mechanics and the corrosion resisting property of the each embodiment of table 3 and comparative example
Test-results shows, the steel bar mechanics performance containing Cr of processing by rolling technology of the present invention is better than common 500MPa grade reinforcing steel, and corrosion resisting property is 4～6 times of conventional 500MPa reinforcing bar.
Claims (3)
1. 500MPa level is corrosion-resistant containing a Cr reinforcing bar, it is characterized in that: the compositions in weight percentage of this reinforcing bar is:
0.05～0.12%C, 8～10%Cr, 0.1～0.3%Cu, 0.1～0.15%Ni, 1～1.5%Mn, N≤0.015%, P≤0.03%, S≤0.035%, 0.2～0.5%Si, all the other are Fe and inevitable impurity.
2. 500MPa level according to claim 1 is corrosion-resistant containing Cr reinforcing bar, it is characterized in that: the compositions in weight percentage of described reinforcing bar is:
0.08～0.10%C, 8～9%Cr, 0.2～0.3%Cu, 0.12～0.15%Ni, 1.2～1.5%Mn, N≤0.010%, P≤0.025%, S≤0.025%, 0.2～0.4%Si, all the other are Fe and inevitable impurity.
3. the corrosion-resistant rolling technology containing Cr reinforcing bar of 500MPa level claimed in claim 1, is characterized in that: furnace temp is 1150～1250 ℃, and start rolling temperature is 1000～1100 ℃, and finishing temperature is 950～1150 ℃, and upper cold bed temperature is 900～1000 ℃.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108774711A (en) * | 2018-06-05 | 2018-11-09 | 马鞍山钢铁股份有限公司 | A kind of armored concrete economical 500MPa grades of seawater corrosion resistance reinforcing bar and its production method |
| CN112458381A (en) * | 2020-11-04 | 2021-03-09 | 江苏省沙钢钢铁研究院有限公司 | Short-process 500 MPa-grade weather-resistant and earthquake-resistant reinforcing steel bar and preparation method thereof |
| CN113846264A (en) * | 2021-08-27 | 2021-12-28 | 马鞍山钢铁股份有限公司 | Tin-containing 500 MPa-grade high-corrosion-resistance steel bar for ocean island concrete engineering and production method thereof |
| CN114672605A (en) * | 2022-05-30 | 2022-06-28 | 江苏沙钢集团有限公司 | Corrosion-resistant steel bar mechanical connection sleeve, wire rod and production method of wire rod |
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| CN108774711A (en) * | 2018-06-05 | 2018-11-09 | 马鞍山钢铁股份有限公司 | A kind of armored concrete economical 500MPa grades of seawater corrosion resistance reinforcing bar and its production method |
| CN108774711B (en) * | 2018-06-05 | 2019-10-01 | 马鞍山钢铁股份有限公司 | A kind of armored concrete economical 500MPa grades of seawater corrosion resistance reinforcing bar and its production method |
| CN112458381A (en) * | 2020-11-04 | 2021-03-09 | 江苏省沙钢钢铁研究院有限公司 | Short-process 500 MPa-grade weather-resistant and earthquake-resistant reinforcing steel bar and preparation method thereof |
| CN112458381B (en) * | 2020-11-04 | 2022-04-19 | 江苏省沙钢钢铁研究院有限公司 | Short-process 500 MPa-grade weather-resistant and earthquake-resistant reinforcing steel bar and preparation method thereof |
| CN113846264A (en) * | 2021-08-27 | 2021-12-28 | 马鞍山钢铁股份有限公司 | Tin-containing 500 MPa-grade high-corrosion-resistance steel bar for ocean island concrete engineering and production method thereof |
| CN114672605A (en) * | 2022-05-30 | 2022-06-28 | 江苏沙钢集团有限公司 | Corrosion-resistant steel bar mechanical connection sleeve, wire rod and production method of wire rod |
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