CN103834871B - 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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- CN103834871B CN103834871B CN201410104201.6A CN201410104201A CN103834871B CN 103834871 B CN103834871 B CN 103834871B CN 201410104201 A CN201410104201 A CN 201410104201A CN 103834871 B CN103834871 B CN 103834871B
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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 corrosion-resistant reinforcing bar containing cr of 500mpa level and its rolling mill practice, belong to Ferrous Metallurgy technology neck
Domain.
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 is straight
Connect the life-span affecting concrete component and safety.At present, China is in urbanization high speed development stage, real estate and base
Infrastructure construction flourishes, and the yield of reinforcing bar and consumption figure all rank first in the world, and China's crude steel yield is more than 7.16 within 2012
Hundred million tons, wherein reinforcing bar yield is more than 1.75 hundred million tons.The smelting of reinforcing bar produces to be needed to consume mass energy and environmental conservation is brought
Negative effect, with the increase of Environmental Protection in China pressure, by increasing reinforced steel bar strength and corrosion resisting property, thus reducing steel using amount and prolonging
Long life, to reach the technology of effects of energy saving and emission reduction, is increasingly paid close attention to by metallurgical scientific worker and government industry.
Before the nineties in 20th century, West Europe, North America and day originally more using high strength cast iron, using high intensity
Reinforcing bar can substantially reduce steel using amount and cost of labor and significantly improve construction quality, have good social benefit and economic effect
Benefit, and China's intensity that xoncrete structure dominates reinforcing bar for a long time is 335mpa, with the promulgation of industry standard, intensity is
The level reinforcing bar of 400mpa is just gradually used, this than a totally low abroad strength grade, cause resource, the energy serious
Waste；Reinforcement corrosion can seriously reduce the service life of reinforcing bar, leads to xoncrete structure premature failure.China is because of corrosion within 2010
And the direct economic loss causing just is up to 1.2 trillion RMB, account for the 3% of gdp then.Because corrosion resisting property reinforcing bar can be effective
Extend the life-span of xoncrete structure and reduce later maintenance cost, therefore, have high intensity, corrosion resistance concurrently in the urgent need to exploitation one kind
Energy and reinforcing bar easy to spread.
Content of the invention
It is an object of the present invention to provide a kind of corrosion-resistant reinforcing bar containing cr of 500mpa level, the yield strength of this reinforcing bar is big
In 500mpa, corrosion resisting property is excellent and has good mechanical property, fatigue behaviour and welding performance.
Further object is that providing the rolling mill practice of above-mentioned reinforcing bar.
For realizing above-mentioned first purpose, the technical solution used in the present invention is:
A kind of corrosion-resistant reinforcing bar containing cr of 500mpa level, the component of this reinforcing bar is by weight percentage:
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, remaining is fe and inevitable impurity.
Further, the component of described reinforcing bar is by weight percentage:
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, remaining is fe and inevitable impurity.
For realizing above-mentioned second purpose, the technical solution used in the present invention is:
A kind of corrosion-resistant rolling mill practice containing cr reinforcing bar of 500mpa level, the furnace temp of this technique is 1150～1250
DEG C, start rolling temperature is 1000～1100 DEG C, and finishing temperature is 950～1150 DEG C, and temperature on cooling table is 900～1000 DEG C.
It is as follows that each group of the reinforcing bar of the present invention is allocated as use:
C is important intensified element in steel, forms solid solution tissue, improves the intensity of steel, phosphorus content is higher, steel in steel
Intensity, hardness higher, but plasticity, toughness can decrease.For the corrosion resisting steel containing chromium, because c and cr affinity is very strong,
Too high c content can reduce the cr content in solid solution, leads to the reduction of corrosion resisting property, the scope of c content therefore in the present invention
Elect as: 0.05～0.12%.
Cr is corrosion resistance element, can dramatically increase steel corrosion resisting property, but cr is ferrite former, and too high cr contains
Amount can make ferrite content in steel increase, and lead to intensity to decline, quenching structure, be unfavorable for organizational controls.In the present invention, cr
Content controls 8～10%.
Cu is corrosion resistance element, contributes to the raising of steel corrosion resisting property, but excessive cu in its steel can cause material to mould
The reduction of property, leads to Hot rolling craccking.In the present invention, cu content controls 0.1～0.3%.
Mn is intensified element, can significantly increase the intensity of steel, and strong with the affinity of s, is subtracted by producing sulphide inculsion
The harm of low s, but too high mn can reduce the plasticity of steel.In the present invention, mn content controls 1～1.5%.
P can improve intensity, hardness and the corrosion resisting property of steel, but in steel, segregation is serious, can significantly reduce steel material mechanical
Can, in the present invention, p content controls within 0.03%.
S easily causes hot-short, leads to the generation of crackle in the operation of rolling, and in steel, mns is mingled with and will also become corrosion simultaneously
Origin, serious reduce steel corrosion resisting property, therefore in the present invention, s content controls within 0.035%.
Si is intensified element, improves the intensity of steel by solution strengthening, and si can effectively be mingled with deoxidation reducing in steel simultaneously
Thing.In the present invention, si content range controls 0.2～0.5%.
N has solution strengthening effect, can effectively improve intensity and the hardness of steel, but too high n content can severe exacerbation steel
Toughness, and lead to notch sensitivity increase.In the present invention, n content controls within 0.015.
The present invention by c, cr, cu, ni, si, mn, p, s, n constituent content in steel be adjusted to 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%, smelt according to common process in converter, electric furnace or other smelting furnace, using control cooling on common bar mill
Technique is rolled by selecting suitable heating-up temperature, start rolling temperature, finishing temperature and temperature on cooling table, can control steel
Phase transformation, obtain the tiny tissue of a layer crystal grain in steel surface, reach and improve steel mechanics performance and corrosion resisting property simultaneously
Purpose.
The hot-rolled reinforced bar performance that the present invention produces can reach following requirements: yield strength rel>=500mpa, tensile strength rm
>=630mpa, percentage elongation a% >=15%；Corrosion resisting property is 4～6 times of (corrosion speed of the reinforcing bar of the present invention of common hrb500 reinforcing bar
Rate is 175～220 μm/year, and the corrosion rate of common hrb500 reinforcing bar is 940～1050 μm/year).
Specific embodiment
Below in conjunction with specific embodiment, the present invention is further detailed explanation.
The weight percent content of each component of reinforcing bar of embodiments of the invention 1～10 and comparative example 1～2 is shown in Table 1.Implement
Example 1～10, all using 50kg vacuum induction furnace smelting, rolls, bar gauge ф 16mm on ф 300mm bar mill.Comparative example
1st, comparative example 2 is industrial common hrb500 reinforcing bar.
Salt spray corrosion test is carried out in q-fog cyclic corrosion case, and test period is 672 hours, and temperature is 35 DEG C, corrosion
The nacl solution that medium is 5% using concentration.
The main technologic parameters of the rolling mill practice of each embodiment and comparative example are shown in Table 2, mechanics and corrosion resisting property is shown in Table 3.
The weight percent content of each component in 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 mill practice of each embodiment of table 2 and comparative example
The mechanics of each embodiment of table 3 and comparative example and corrosion resisting property
Result of the test shows, is better than common by the steel bar mechanics performance containing cr of the rolling mill practice processing of the present invention
500mpa level reinforcing bar, and corrosion resisting property is 4～6 times of conventional 500mpa reinforcing bar.
Claims (2)
1. a kind of corrosion-resistant rolling mill practice containing cr reinforcing bar of 500mpa level it is characterised in that: the component of this reinforcing bar percentage by weight
Than for:
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, remaining is fe and inevitable impurity；
Furnace temp is 1150～1250 DEG C, and start rolling temperature is 1000～1100 DEG C, and finishing temperature is 950～1150 DEG C, on
Cold bed temperature is 900～1000 DEG C.
2. the corrosion-resistant rolling mill practice containing cr reinforcing bar of 500mpa level according to claim 1 it is characterised in that: described reinforcing bar
Component be by weight percentage:
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%th, p≤0.025%, s≤0.025%, 0.2～0.4%si, remaining is fe and inevitable impurity.
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| CN201410104201.6A CN103834871B (en) | 2014-03-19 | 2014-03-19 | 500MPa-level corrosion-resistant Cr-contained reinforcing steel bar and rolling process thereof |
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| CN103834871B true CN103834871B (en) | 2017-01-18 |
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Families Citing this family (4)
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| 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 |
| 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 |
| CN113846264B (en) * | 2021-08-27 | 2022-08-19 | 马鞍山钢铁股份有限公司 | High-corrosion-resistance steel bar for tin-containing 500 MPa-grade ocean island concrete engineering and production method thereof |
| CN114672605B (en) * | 2022-05-30 | 2022-09-16 | 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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| SU503932A1 (en) * | 1974-12-25 | 1976-02-25 | Череповецкий Ордена Ленина Металлургический Завод Им.50-Летия Ссср | Reinforcing steel |
| JP2006273692A (en) * | 2005-03-30 | 2006-10-12 | Jfe Steel Kk | Hydrated hardened body containing reinforcing bar excellent in salt damage resistance |
| CN102605255A (en) * | 2012-01-19 | 2012-07-25 | 武汉钢铁(集团)公司 | 400Mpa grade corrosion resistant reinforcing steel bar |
| CN103451516A (en) * | 2013-08-30 | 2013-12-18 | 武汉钢铁(集团)公司 | HRB500 reinforcing steel bar and preparation method thereof |
| CN103556058A (en) * | 2013-10-21 | 2014-02-05 | 武汉钢铁(集团)公司 | Low-cost, high-performance corrosion-resistant steel bar and preparation method thereof |
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| JP4441295B2 (en) * | 2004-03-15 | 2010-03-31 | 新日本製鐵株式会社 | Manufacturing method of high strength steel for welding and high strength steel for welding with excellent corrosion resistance and machinability |
| CN102732787B (en) * | 2012-07-20 | 2013-12-25 | 江苏省沙钢钢铁研究院有限公司 | 600 MPa-level anti-seismic twisted steel and manufacturing method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU503932A1 (en) * | 1974-12-25 | 1976-02-25 | Череповецкий Ордена Ленина Металлургический Завод Им.50-Летия Ссср | Reinforcing steel |
| JP2006273692A (en) * | 2005-03-30 | 2006-10-12 | Jfe Steel Kk | Hydrated hardened body containing reinforcing bar excellent in salt damage resistance |
| CN102605255A (en) * | 2012-01-19 | 2012-07-25 | 武汉钢铁(集团)公司 | 400Mpa grade corrosion resistant reinforcing steel bar |
| CN103451516A (en) * | 2013-08-30 | 2013-12-18 | 武汉钢铁(集团)公司 | HRB500 reinforcing steel bar and preparation method thereof |
| CN103556058A (en) * | 2013-10-21 | 2014-02-05 | 武汉钢铁(集团)公司 | Low-cost, high-performance corrosion-resistant steel bar and preparation method thereof |
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