CN102286700B - Sulfuric acid dew point corrosion resistant steel with tensile strength of more than or equal to 800MPa and preparation method thereof - Google Patents
Sulfuric acid dew point corrosion resistant steel with tensile strength of more than or equal to 800MPa and preparation method thereof Download PDFInfo
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- CN102286700B CN102286700B CN 201110268721 CN201110268721A CN102286700B CN 102286700 B CN102286700 B CN 102286700B CN 201110268721 CN201110268721 CN 201110268721 CN 201110268721 A CN201110268721 A CN 201110268721A CN 102286700 B CN102286700 B CN 102286700B
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- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 title claims abstract description 46
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- 241001062472 Stokellia anisodon Species 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 238000003723 Smelting Methods 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 53
- 239000010959 steel Substances 0.000 abstract description 53
- 238000005260 corrosion Methods 0.000 abstract description 17
- 230000007797 corrosion Effects 0.000 abstract description 16
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- 238000010438 heat treatment Methods 0.000 abstract 1
- 229910052804 chromium Inorganic materials 0.000 description 6
- 229910052759 nickel Inorganic materials 0.000 description 6
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- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
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- 102100038141 Nucleus accumbens-associated protein 1 Human genes 0.000 description 1
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Abstract
The invention discloses sulfuric acid dew point corrosion resistant steel with tensile strength of more than or equal to 800MPa and a preparation method thereof, wherein the steel comprises the following components in percentage by weight: c: 0.05-0.2, Si: 0.10-0.50, Mn: 0.20-1.00, Cu: 0.20-0.60, Cr: 0.30-0.50, Ni: 0.10-0.30, Ti: 0.08-0.15, and the balance Fe and impurities; the steel is prepared by a controlled rolling and controlled cooling process, which comprises the following steps: and heating and preserving the plate blank with the same components as the steel grade at 1150-1250 ℃ for 120-180min, and rolling into a plate coil, wherein the final rolling temperature is 800-900 ℃, and then the plate blank is cooled to 660-750 ℃ through laminar cooling at the cooling speed of 20-40 ℃/s for coiling. According to the invention, by adopting the design of combination of various alloy elements and the rolling and cooling control process, the steel grade with yield strength of more than or equal to 690MPa, tensile strength of more than or equal to 800MPa, elongation of more than or equal to 22% and good corrosion resistance effect is prepared, and the process is simple and low in cost.
Description
Technical field
The present invention be more particularly directed to a kind of high-tensile corrosion-resistant steel and preparation method thereof, relate in particular to a kind of tensile strength 〉=800MPa level corrosionproof steel against sulfuric acid at dew point and preparation method thereof.
Background technology
Corrosionproof steel against sulfuric acid at dew point generally is applied in the smoke processing system of the industrial circles such as metallurgy, electric power, petrochemical industry take coal or heavy oil as main fuel, as desulfurizer in air preheater, economizer, flue, chimney, rail truck, oil derrick, production vessel and the chemical petroleum equipment at boiler low-temperature position etc.
Abroad using at present or disclosed corrosionproof steel against sulfuric acid at dew point in, mainly with Cu-Cr-Sb (Sn) set member formula, as the U.S. and the main trade mark that uses of Japan, COR-TEN, NAC-1, NAC-2B, NAC-2C, CRIA etc. are arranged in boiler preheater.
Domestic development and exploitation for this steel grade started late, the steel grade of composition system and the general Japanese of Application standard, the B485NL of Baosteel, ND (09CuCrSb) steel of Jiangyin special steel etc. are typically arranged, but these steel grade low strengths, tensile strength is generally less than 550MPa, easily causes the rupture failure of chimney, production vessel, chemical industry equipment equivalent-load spare.
In the prior art, the Sb element is the key element that improves the corrosionproof steel against sulfuric acid at dew point corrosion resistance nature always.Publication number is that the patent of invention of CN 1455822A, CN 1490427A, CN 1123845A and CN 101705441A is all the improvement projects that propose on Cu-Cr-Sb system basis, but the tensile strength of these steel grades is all below 550MPa, low strength, in addition, because Sb element fusing point is lower, be a kind of hot-short element that easily causes, it is improper to control as hot rolling technology, more easily produces surface crack.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency, a kind of novel corrosionproof steel against sulfuric acid at dew point and preparation method thereof is provided, this steel grade yield strength 〉=690MPa, tensile strength 〉=800MPa, unit elongation (A) 〉=22%, and do not change in 20 ℃, 20wt% sulfuric acid that under 24 hours conditions of solution, corrosion resistance nature is more than 50 times of Q235B steel, approach and the slightly unconventional erosion resistance that contains the Sb steel, and have good cold roll forming performance, simultaneously, preparation technology is simple for this steel grade, and is with low cost.
For achieving the above object, the present invention has adopted following technical scheme:
A kind of tensile strength 〉=800MPa level corrosionproof steel against sulfuric acid at dew point, it is characterized in that, it comprises the following component of percentage calculating by weight: C 0.05-0.2, Si 0.10-0.50, Mn 0.20-1.00, Cu 0.20-0.60, Cr 0.30-0.50, Ni 0.10-0.30, Ti 0.08-0.15, and the Fe of surplus and impurity.
Tensile strength 〉=800Mpa level corrosionproof steel against sulfuric acid at dew point is to adopt the cooling controlling and rolling controlling process preparation as mentioned above, this technique is: the slab that will have with above-mentioned tensile strength 〉=800Mpa level corrosionproof steel against sulfuric acid at dew point same composition rolls into coiled sheet after 1150-1250 ℃ of heat tracing 120-180min, wherein finishing temperature is 800-900 ℃, and batch speed of cooling 20-40 ℃/s by the cooling 660-750 of being chilled to of laminar flow ℃.
Below technical scheme of the present invention is made schematic illustration.
Effect and the mechanism of each alloying element of the present invention are as follows:
C element: C is indispensable one of high-intensity element of carrying in steel, but because C can make the corrosion resistance nature of steel deteriorated, therefore, consider intensity and corrosion resistance nature, setting the C content range is 0.05%-0.20% (unless otherwise noted following, as all to be weight percentage).
The Si element: the Si element is to carry high-intensityly with the solution strengthening form, be also simultaneously the deoxidant element in steel, but content can not be too high, in order to avoid reduce toughness and the welding property of steel, so Si content of the present invention is set as 0.10%-0.50%.
The Mn element: add appropriate Mn in steel, not only can improve by the solution strengthening of Mn the intensity of steel, and can reduce the transformation temperature of steel, crystal grain thinning, the over-all properties of raising steel, Mn content of the present invention is set as 0.20%-1.00%.
P and S element: P easily cause segregation in steel, worsen welding property, significantly reduce the impelling strength of steel, improve brittle transition temperature; The easy production MnS of being combined with Mn of S is mingled with, and affects the processability of steel.Therefore, should try one's best less P and S element of the present invention.
Cu, Cr and Ni element: the Cu element is the fundamental element that improves erosion resistance, can promote steel to produce anode passivation under certain condition, thereby reduces the corrosion speed of steel.Cu enrichment in rusty scale can greatly improve the protectiveness of rusty scale.Suitable S and Cu effect can form the Cu2S protective membrane, play the corrosion mitigation effect; Cr and Ni only have to coordinate just with Cu can positive effect, because the electropotential of Cr and Ni is lower, has the passivation tendency, thereby improves corrosion resisting property, and Cr and Ni are used in conjunction with, and effect is more obvious.In addition, the Ni element can reduce the hot-short impact that the Cu element brings at course of hot rolling.Therefore Cu content of the present invention is decided to be 0.20%-0.60%, and Cr content is decided to be 0.30%-0.50%, and Ni content is decided to be 0.10-0.30%.
Ti element: Ti and Cu and Cr rational proportion make corrosion product finer and close, reduce erosion rate, and Ti is conducive to the tissue of refinement steel, the intergranular corrosion resistance performance of the potential difference raising steel between less matrix; In addition, when Ti content＞0.06%, along with the increase of Ti content, precipitating reinforcing effect is better, and namely the TiC particle is separated out in ferrite after alternate or phase transformation, produces strong precipitation strength effect; But when Ti content＞0.15%, be that abundant solid solution is more in the thick TiN amount of austenite under high temperature, worsen on the contrary the toughness of steel, thick TiN and the potential difference between matrix are larger, can become again the source of corrosion, worsen the corrosion resistance to sulfuric acid of steel.Therefore, controlling its content is 0.08%-0.15%.
Compared with prior art, the present invention has following advantage at least:
(1) steel yield strength 〉=690MPa of the present invention, tensile strength 〉=800MPa, unit elongation (A) 〉=22% is compared with traditional Sb steel that contains that has disclosed in Sb steel or patent that contains, and performance is obviously excellent.Steel of the present invention batches between 660-750 ℃, so that TiC fully separates out, precipitated phase is tiny, reaches strengthening effect.Simultaneously tiny precipitated phase and the potential difference between matrix are less, improve the corrosion resistance to sulfuric acid of steel.
(2) to be designed to Cu-Cr-Ni-Ti be corrosionproof steel against sulfuric acid at dew point to composition of steel of the present invention, compares with Cu-Cr-Sb system, removed the use to the Sb element, and alloying element is simple, and the Cr constituent content is lower, and cost is lower.Avoided simultaneously the impact of Sb element on the hot-short performance of steel, rolling technology is controlled easily; In addition, also avoided Sb as the impurity element in a kind of Clean Steel, to the pollution of steelmaking process.
Embodiment
Below in conjunction with a preferred embodiment, technical scheme of the present invention is further described.
The basal component of the present embodiment corrosionproof steel against sulfuric acid at dew point is as shown in table 1, and all the other are Fe and inevitable impurity.
Table 1 implementation column 1 chemical composition
The present embodiment is to adopt the cooling controlling and rolling controlling process preparation, its technological process is: at first prepare raw materials for metallurgy according to the composition of described corrosionproof steel against sulfuric acid at dew point, and smelt and cast slab, then slab is rolled into coiled sheet after 1250 ℃ of heat tracing 180min, finishing temperature is 820 ℃, it is chilled to 690 ℃ and batches by laminar flow is cooling, and speed of cooling is 25 ℃/s, and the mechanical property of the sheet material that obtains is as shown in table 2.
The mechanical property of table 2 embodiment 1
| Yield strength/MPa | Tensile strength/MPa | Unit elongation A 50/％ | 180 ° of clod washes (width＞35mm, d=2a) |
| 710 | 820 | 24 | Qualified |
In the corrosion resistance to sulfuric acid test, adopt two kinds of compared steel: a kind of is Q235B; Another kind of Sb composition of steel is: C 0.12%, Si 0.45%, Mn 0.49%, P 0.007%, S 0.004%, Cu 0.33%, Cr1.00%, Ni 0.13%, Sb 0.10%, all the other are Fe and inevitable impurity.Corrosion test adopts sulfuric acid entirely to soak experiment, with reference to national standard JB/T7901-1999.Experiment condition is: entirely soaked continuously 24 hours in 20 ℃, 20% sulfuric acid (mass percent).
The corrosion resistance nature of table 3 embodiment 1 and Comparative Examples
The present invention adds multiple alloying element simultaneously, by the comprehensive action between each element, adopts the temperature control controlled rolling process, especially batches at 660-750 ℃, reaches high-tensile and anti-corrosion effect.
Although technical scheme of the present invention is described by preferred embodiment, but those skilled in the art obviously can change method as herein described within not breaking away from content of the present invention, spirit and scope, more particularly, the replacement that all are similar and change apparent to those skilled in the artly, they are deemed to be included in spirit of the present invention, scope and content.
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| US10351925B2 (en) * | 2014-03-28 | 2019-07-16 | Nippon Steel Nisshin Co., Ltd. | Steel plate having excellent acid dew point corrosion resistance, method of production, and exhaust gas channel constituent member |
| CN106282831B (en) * | 2015-05-25 | 2018-11-06 | 宝钢湛江钢铁有限公司 | A kind of high-strength container weather resisting steel and its manufacturing method |
| CN108342662B (en) * | 2018-02-23 | 2020-03-10 | 柳州钢铁股份有限公司 | High-strength weathering steel with yield strength of 550MPa |
| CN110438402B (en) * | 2019-09-05 | 2021-02-12 | 首钢集团有限公司 | 1000 Mpa-grade sulfuric acid dew point corrosion resistant bolt steel and preparation method thereof |
| CN115637391B (en) * | 2022-11-07 | 2023-05-12 | 鞍钢股份有限公司 | 550MPa grade sulfuric acid dew point corrosion resistant rare earth steel and manufacturing method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101910442A (en) * | 2007-12-27 | 2010-12-08 | Posco公司 | Steel having excellent resistance to corrosion by hydrochloric acid and sulfuric acid and method for manufacturing the same |
| CN102021498A (en) * | 2009-09-18 | 2011-04-20 | 鞍钢股份有限公司 | A kind of low alloy sulfuric acid dew point corrosion resistant steel plate and its manufacturing method |
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| JPH0925536A (en) * | 1995-07-06 | 1997-01-28 | Sumitomo Metal Ind Ltd | Acid dew point corrosion steel |
| JP3584636B2 (en) * | 1996-10-08 | 2004-11-04 | 住友金属工業株式会社 | Sulfuric acid / hydrochloric acid dew-point corrosion resistant steel with excellent hot workability |
| JP2000017382A (en) * | 1998-07-03 | 2000-01-18 | Nippon Steel Corp | Steel with excellent sulfuric acid corrosion resistance |
| JP2000073139A (en) * | 1998-08-26 | 2000-03-07 | Nkk Corp | Steel for bolt excellent in sulfuric acid corrosion resistance |
| JP4319817B2 (en) * | 2001-11-19 | 2009-08-26 | 新日本製鐵株式会社 | Low alloy steel excellent in hydrochloric acid corrosion resistance and sulfuric acid corrosion resistance and its welded joint |
| CN101717886A (en) * | 2009-11-20 | 2010-06-02 | 江苏省沙钢钢铁研究院有限公司 | Tensile strength 650MPa grade hot-rolled dual-phase steel plate and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101910442A (en) * | 2007-12-27 | 2010-12-08 | Posco公司 | Steel having excellent resistance to corrosion by hydrochloric acid and sulfuric acid and method for manufacturing the same |
| CN102021498A (en) * | 2009-09-18 | 2011-04-20 | 鞍钢股份有限公司 | A kind of low alloy sulfuric acid dew point corrosion resistant steel plate and its manufacturing method |
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| JP特开2000-73139A 2000.03.07 |
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Denomination of invention: Sulfuric acid dew point corrosion resistant steel with tensile strength 800MPa and its preparation method Effective date of registration: 20210901 Granted publication date: 20130612 Pledgee: China Construction Bank Zhangjiagang branch Pledgor: INSTITUTE OF RESEARCH OF IRON & STEEL,SHAGANG,JIANGSU PROVINCE Registration number: Y2021980008699 |