CN102534381A - All-weather low-cost weathering steel - Google Patents
All-weather low-cost weathering steel Download PDFInfo
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- CN102534381A CN102534381A CN2011104568725A CN201110456872A CN102534381A CN 102534381 A CN102534381 A CN 102534381A CN 2011104568725 A CN2011104568725 A CN 2011104568725A CN 201110456872 A CN201110456872 A CN 201110456872A CN 102534381 A CN102534381 A CN 102534381A
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Abstract
The invention relates to the field of low-alloy steel, particularly an all-weather low-cost weathering steel capable of resisting corrosion of marine atmosphere, industrial atmosphere and industrial coast atmosphere. The invention is mainly used for steel structures of marine operating platforms, railways, vehicles, bridges, towers and the like which are exposed to the marine atmosphere, industrial atmosphere and industrial coast atmosphere for a long time. The weathering steel comprises the following alloy components in percentage by weight: 0.12-0.2% of C, 0.4-0.5% of Si, 1.2-2.0% of Mn, at most 0.02% of S, 0.045-0.075% of P, 0.30-0.40% of Cu and the balance of Fe. By alloying Cu, Mn, P and the like and simply adjusting the contents of part of elements in the ordinary low-carbon steel (Q235 steel), the invention can produce the low-cost weathering steel capable of resisting corrosion of marine atmosphere, industrial atmosphere and industrial coast atmosphere without changing the conditions of the Q235 steel production technique.
Description
Technical field
The present invention relates to the low alloy steel field; The low-cost weathering steel of the full time type of particularly a kind of anti-marine atmosphere, industrial atmosphere and industrial seashore atomospheric corrosion is mainly used in offshore operations platform, railway, vehicle, bridge, pylon etc. and is exposed to the steelwork that uses in marine atmosphere, industrial atmosphere and the industrial seashore atmosphere for a long time.
Background technology
At present, FSU's patent (SU1822446A3), Japanese Patent (spy opens flat 9-277083, the spy opens flat 1-92341), European patent (EP 0841 409A1) etc. are introduced weather resisting steel in the disclosed at present technical literature, in steel, add Cu but generally adopt; P, Cr, Ni; Alloying elements such as Al, the also interpolation As that has, Ce; Co, Ti, elements such as V.Though above-mentioned patent has improved the performance of steel, cost is too high, and technical process is complicated, and there is bigger difficulty in the marketization.
In existing low-cost weather resisting steel, most typical is the MnCu weathering steel.Its staple (weight %) is as follows: C 0.12-0.21%, and Si 0.2-2.0%, Mn 0.7-2.0%, S≤0.036%, P≤0.034%, Cu0.10-0.40%, Al＜0.2%, all the other are Fe and trace impurity.The applicant and the patent No. are: Dong Junhua, CHEN XINHUA, Han Enhou etc. a kind of economy type weathering-resistant steel, 200510045624.6.
Above-mentioned MnCu weathering steel can show in the seashore atmospheric environment than ordinary steel Q235 and the excellent solidity to corrosion of 16Mn.But, this steel anti-corrosion unsatisfactory in the industrial atmosphere environment, it is suitable with the Q235 solidity to corrosion slightly to be superior to 16Mn.Simultaneously, along with the development of economic society, the atmosphere in many coastal cities is polluted gradually and is changed into the seashore industrial atmosphere gradually by the seashore atmospheric environment.This is objectively requiring the not only anti-single seashore atomospheric corrosion of weathering steel, and perhaps industrial atmospheric corrosion also will have the ability of the industrial atmospheric corrosion of anti-the seashore simultaneously.
Summary of the invention
The present invention is directed to existing steel grade production cost height and MnCu weathering steel present situation, provide a kind of novel full time type low-cost weathering steel in industrial atmosphere environment solidity to corrosion difference.It is element alloyed on the basis of MnCu weathering steel, to pass through P, just can produce not only in the seashore atmospheric environment, to have good corrosion resistance, and the low-cost weathering steel that in industrial atmosphere and seashore industrial atmosphere environment, has good corrosion resistance.
To above-mentioned purpose, the technical scheme that the present invention adopted is:
On the basis of MnCu weathering steel chemical ingredients, improve the content of P element.Concrete chemical ingredients weight percent content of the present invention is: C 0.12-0.2%, and Si 0.4-0.5%, Mn 1.2-2.0%, S≤0.02%, P0.045-0.075%, Cu 0.30-0.40%, all the other are Fe.
Among the present invention, P is preferably 0.05-0.07%.
The present invention improves the lower limit of P constituent content in the MnCu weathering steel, is based on following principle:
The P element is to improve the most effectively one of alloying element of low alloy steel acid resistance atomospheric corrosion.Research shows: the P element promotes that to corrosive restraining effect and P element densification is stablized in formation and antiacid dissolved alpha-feooh component is relevant in the weathering steel rusty scale, it has stopped rodent H in the corrosive medium
+Ion is to the transmission of metallic matrix.In addition, follow the corrosion of steel, P together is oxidized to PO
4 3-Can also play the inhibiter effect after getting into rusty scale, on the one hand PO
4 3-H in can the complexing thin liquid film
+Improve interface pH value, the reduction reaction of slowing down cathode liberation of hydrogen is also slowed down the dissolving to rusty scale, on the other hand, and PO
4 3-In the anodic dissolution processes of steel can with Fe
2+And Mn
2+Plasma combines, and forms the phosphate layer of indissoluble, and the carrying out of blocking anode solubilizing reaction plays the effect of inhibiter.
After Cu adds; Help to form non-crystal oxide (oxyhydroxide) resist fine and close, that adhesivity is good on the surface of steel; Make corrosive medium be difficult to pass through; Thereby stoped the interface zone corrosive between steel surface and the non-crystalline state resist to take place, the time, long more resist was finer and close, and anti-corrosion effect is also obvious more.
In addition, Cu can also offset the deleterious effect of S in the steel, and Cu and S generate the sulfide of indissoluble, thereby have offset S to the corrosion proof deleterious effect of steel.Cu has very strong solution strengthening effect, and the intensity of steel is significantly improved.
Mn improves weather-resistant effective element.In 0.3-0.7% (mass percent) scope of effect can take place Cu, Mn reached a certain amount of back and acts synergistically with Cu, and the atmospheric corrosion resistance ability improves greatly.Mn and S form the high MnS of fusing point, both can prevent the hot-short phenomenon that causes because of FeS, offset S to the corrosion proof deleterious effect of steel; Reduce the lower change point of steel; Condensate depression when increasing the austenite cooling, refine pearlite is organized and is improved its mechanical property, can improve the validity of Cu again; Mn enlarges the γ phase region simultaneously, forms unlimited solid solution, and stronger solution strengthening effect is arranged, and further improves the intensity of steel.
Characteristics of the present invention are:
1, the present invention is through improving the content of P element in the MnCu weathering steel, provides a kind of production technique simple and have a good atmosphere of anti-seashore the, the low-cost weather resisting steel of industrial atmosphere and seashore industrial atmospheric corrosion performance and comprehensive mechanical performance.
2, the present invention passes through Cu; Mn; Alloyings such as P, and simply adjust the part constituent content of ordinary low-carbon steel (Q235 steel), need not change under the Q235 steel manufacturing condition; Just can produce and have good anti-seashore atomospheric corrosion, the low-cost weathering steel of industrial atmospheric corrosion and seashore industrial atmospheric corrosion.
Description of drawings
Fig. 1 is the surrosion curve of different embodiment P content weathering steels laboratory accelerated test in simulation seashore atmospheric environment; Wherein, simulation solution is 0.3% (mass percent) NaCl solution.
Fig. 2 is the surrosion curve of different embodiment P content weathering steels laboratory accelerated test in simulation industrial atmosphere environment; Wherein, simulation solution is 0.1% (mass percent) Na
2SO
3Solution, pH=4.0.
Fig. 3 is the surrosion curve of different embodiment P content weathering steels laboratory accelerated test in simulation seashore industrial atmosphere environment; Wherein, simulation solution is 0.3% (mass percent) NaCl+0.1% (mass percent) Na
2SO
3Solution, pH=4.0.
Fig. 4 is the surrosion curve of embodiment MnCuP weathering steel and other steel grade laboratory accelerated test in simulation seashore atmospheric environment; Wherein, simulation solution is 0.3% (mass percent) NaCl solution.
Fig. 5 is the surrosion curve of embodiment MnCuP weathering steel and other steel grade laboratory accelerated test in simulation industrial atmosphere environment; Wherein, simulation solution is 0.1% (mass percent) Na
2SO
3Solution, pH=4.0.
Fig. 6 is the surrosion curve of embodiment MnCuP weathering steel and other steel grade laboratory accelerated test in simulation seashore industrial atmosphere environment; Wherein, simulation solution is 0.3% (mass percent) NaCl+0.1% (mass percent) Na
2SO
3Solution, pH=4.0.
Embodiment
According to chemical ingredients scope of the present invention, electric furnace or the conventional smelting of converter are adopted in its preparation, control the content of crucial alloying element, have prepared 3 stoves weathering steel WR1 of the present invention, WR2, WR3.Concrete chemical ingredients is as shown in table 1, and the mechanical property of this steel grade is seen table 2.To the steel chamber of the experimentizing simulation atomospheric corrosion accelerated test of three heat (batch) numbers, the simulation atmospheric environment is seashore atmosphere, industrial atmosphere and seashore industrial atmosphere.Test-results such as Fig. 1-shown in Figure 3.
In order to contrast, the application has still carried out the atmosphere accelerated corrosion test in above-mentioned three environment with the sample of compared steel Q235,16Mn, MnCu simultaneously.Test-results such as Fig. 4-shown in Figure 6.
The chemical ingredients of the different embodiment P of table 1 content weathering steel: (mass percent)
| Embodiment | C | Si | Mn | S | P | Cu | Fe |
| WR1 | 0.196 | 0.49 | 1.89 | 0.013 | 0.046 | 0.292 | Surplus |
| WR2 | 0.14 | 0.413 | 1.38 | 0.011 | 0.066 | 0.396 | Surplus |
| WR3 | 0.143 | 0.43 | 1.23 | 0.017 | 0.074 | 0.30 | Surplus |
The mechanical property of table 2 embodiment
As can beappreciated from fig. 1, after 120 cycles (60 days) accelerated test, the anti-seashore atomospheric corrosion performance of embodiment sample WR2 steel grade is best.
As can beappreciated from fig. 2, after 120 cycles (60 days) accelerated test, the anti-industrial atmospheric corrosion performance of embodiment sample WR1 steel grade is best.
As can beappreciated from fig. 3, after 120 cycles (60 days) accelerated test, the industrial atmospheric corrosion of anti-seashore performance of embodiment sample WR2 steel grade is best.
Comprehensive different embodiment P content weathering steel is being simulated the seashore atmosphere, the surrosion result in industrial atmosphere and the seashore industrial atmosphere, and the present invention confirms that the optimum range of P content in the steel is (mass percent): 0.05-0.07%.
As can beappreciated from fig. 4, after 120 cycles (60 days) accelerated test, MnCuP weathering steel solidity to corrosion in the seashore atmosphere is superior to 16Mn steel, Q235 steel and MnCu weathering steel.
As can beappreciated from fig. 5, after 120 cycles (60 days) accelerated test, MnCuP weathering steel solidity to corrosion in industrial atmosphere is superior to 16Mn steel, Q235 steel and MnCu weathering steel.
As can beappreciated from fig. 6, after 120 cycles (60 days) accelerated test, MnCuP weathering steel solidity to corrosion in the seashore industrial atmosphere is superior to the Q235 steel.
Comprehensive MnCuP weathering steel can find that with the solidity to corrosion contrast of 16Mn steel, Q235 steel and MnCu weathering steel the MnCuP weathering steel that the present invention obtains is a kind of low-cost weathering steel of full time type in simulation seashore atmosphere, industrial atmosphere and seashore industrial atmosphere.
Claims (2)
1. low-cost weathering steel of full time type, it is characterized in that: the alloy ingredient of this weathering steel and weight percent content are:
C 0.12-0.2%, Si 0.4-0.5%, Mn 1.2-2.0%, S≤0.02%, P 0.045-0.075%, Cu0.30-0.40%, all the other are Fe.
2. according to the low-cost weathering steel of the described full time type of claim 1, it is characterized in that: P is preferably 0.05-0.07%.
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| CN2011104568725A CN102534381A (en) | 2011-12-30 | 2011-12-30 | All-weather low-cost weathering steel |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103233167A (en) * | 2013-04-11 | 2013-08-07 | 首钢总公司 | An industrial atmospheric corrosion resistant rebar and a production method thereof |
| CN108286026A (en) * | 2018-01-17 | 2018-07-17 | 福建三宝钢铁有限公司 | A kind of An industrial atmospheric corrosion resistant rebar and preparation method thereof |
| CN108754334A (en) * | 2018-07-25 | 2018-11-06 | 包头钢铁（集团）有限责任公司 | 500MPa grades of antidetonation atmospheric corrosion resistance reinforcing bars and its manufacturing method |
| CN109023041A (en) * | 2018-07-24 | 2018-12-18 | 包头钢铁（集团）有限责任公司 | 400MPa grades of antidetonation anti-chlorine ion corrosion reinforcing bars and its manufacturing method |
| CN109023042A (en) * | 2018-07-25 | 2018-12-18 | 包头钢铁（集团）有限责任公司 | 500MPa grades of antidetonation anti-chlorine ion corrosion reinforcing bars and its manufacturing method |
| CN109023040A (en) * | 2018-07-24 | 2018-12-18 | 包头钢铁（集团）有限责任公司 | 400MPa grades of antidetonation atmospheric corrosion resistance reinforcing bars and its manufacturing method |
| CN113789506A (en) * | 2021-09-15 | 2021-12-14 | 西安隆基绿能建筑科技有限公司 | Metal plate, building and preparation method of metal plate |
| CN114753566A (en) * | 2022-05-05 | 2022-07-15 | 易建网科技有限公司 | High resistant steel heat preservation connecting piece that waits |
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| JP2001020036A (en) * | 1999-07-08 | 2001-01-23 | Nkk Corp | Wide flange shape for timbering excellent in weather resistance |
| CN1752260A (en) * | 2005-10-10 | 2006-03-29 | 燕山大学 | Hot-rolling double-phase weather-resistant steel plate and mfg. method thereof |
| CN1800428A (en) * | 2005-01-07 | 2006-07-12 | 中国科学院金属研究所 | Economy type weathering-resistant steel |
| CN101067162A (en) * | 2007-06-27 | 2007-11-07 | 攀钢集团攀枝花钢铁研究院 | Copper-containing steel heating method and copper-containing steel produced by the same |
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2011
- 2011-12-30 CN CN2011104568725A patent/CN102534381A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001020036A (en) * | 1999-07-08 | 2001-01-23 | Nkk Corp | Wide flange shape for timbering excellent in weather resistance |
| CN1800428A (en) * | 2005-01-07 | 2006-07-12 | 中国科学院金属研究所 | Economy type weathering-resistant steel |
| CN1752260A (en) * | 2005-10-10 | 2006-03-29 | 燕山大学 | Hot-rolling double-phase weather-resistant steel plate and mfg. method thereof |
| CN101067162A (en) * | 2007-06-27 | 2007-11-07 | 攀钢集团攀枝花钢铁研究院 | Copper-containing steel heating method and copper-containing steel produced by the same |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103233167A (en) * | 2013-04-11 | 2013-08-07 | 首钢总公司 | An industrial atmospheric corrosion resistant rebar and a production method thereof |
| CN108286026A (en) * | 2018-01-17 | 2018-07-17 | 福建三宝钢铁有限公司 | A kind of An industrial atmospheric corrosion resistant rebar and preparation method thereof |
| CN109023041A (en) * | 2018-07-24 | 2018-12-18 | 包头钢铁（集团）有限责任公司 | 400MPa grades of antidetonation anti-chlorine ion corrosion reinforcing bars and its manufacturing method |
| CN109023040A (en) * | 2018-07-24 | 2018-12-18 | 包头钢铁（集团）有限责任公司 | 400MPa grades of antidetonation atmospheric corrosion resistance reinforcing bars and its manufacturing method |
| CN108754334A (en) * | 2018-07-25 | 2018-11-06 | 包头钢铁（集团）有限责任公司 | 500MPa grades of antidetonation atmospheric corrosion resistance reinforcing bars and its manufacturing method |
| CN109023042A (en) * | 2018-07-25 | 2018-12-18 | 包头钢铁（集团）有限责任公司 | 500MPa grades of antidetonation anti-chlorine ion corrosion reinforcing bars and its manufacturing method |
| CN113789506A (en) * | 2021-09-15 | 2021-12-14 | 西安隆基绿能建筑科技有限公司 | Metal plate, building and preparation method of metal plate |
| CN113789506B (en) * | 2021-09-15 | 2023-09-01 | 隆基乐叶光伏科技有限公司 | Metal plate, building and preparation method of metal plate |
| CN114753566A (en) * | 2022-05-05 | 2022-07-15 | 易建网科技有限公司 | High resistant steel heat preservation connecting piece that waits |
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Application publication date: 20120704 |