CN102286700A - Sulfuric-acid-resistant dew point corrosion steel with tensile strength greater than or equal to 800Mpa grade and preparation method thereof - Google Patents
Sulfuric-acid-resistant dew point corrosion steel with tensile strength greater than or equal to 800Mpa grade and preparation method thereof Download PDFInfo
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- CN102286700A CN102286700A CN2011102687217A CN201110268721A CN102286700A CN 102286700 A CN102286700 A CN 102286700A CN 2011102687217 A CN2011102687217 A CN 2011102687217A CN 201110268721 A CN201110268721 A CN 201110268721A CN 102286700 A CN102286700 A CN 102286700A
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Abstract
The invention discloses sulfuric-acid-resistant dew point corrosion steel with the tensile strength greater than or equal to 800Mpa grade, which comprises the following ingredients (weight percent): 0.05 to 0.2 of C, 0.10 to 0.50 of Si, 0.20 to 1.00 of Mn, 0.20 to 0.60 of Cu, 0.30 to 0.50 of Cr, 0.10 to 0.30 of Ni, 0.08 to 0.15 of Ti and the balance iron and impurities and is prepared through a rolling control and cold control process. The rolling control and cold control process comprises the following steps of: carrying out heating and heat preservation for 120 to 180 min on plate blanks with the same ingredients as the steel at 1150 to 1250 DEG C; then, rolling the plate blanks into plate rolls at the final rolling temperature being 800 to 900 DEG C; and carrying out coiling after the laminar flow cooling to 660 to 750 DEG C at the cooling speed being 20 to 40 DEG C/s. The invention adopts the design with the combination of various alloy elements and the rolling control and cold control process, the steel with the bending intensity greater than or equal to 690MPa, the tensile strength greater than or equal to 800Mpa, the elongation rate greater than or equal to 22 percent and a good anti-corrosion effect can be obtained through preparation, in addition, the process is simple, and the cost is low.
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
The corrosionproof steel against sulfuric acid at dew point widespread usage is the smoke processing system of main fuel at industrial circles such as metallurgy, electric power, petrochemical industry with coal or heavy oil, 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 prescription, COR-TEN, NAC-1, NAC-2B, NAC-2C, CRIA etc. are arranged as the U.S. and the main trade mark that in the boiler preheating device, uses of Japan.
Domestic development and exploitation for this steel grade started late, composition system and use standard are generally used for reference the steel grade of Japan, the B485NL of Baosteel, ND (09CuCrSb) steel of Jiangyin special steel etc. are typically arranged, but these steel grade intensity are on the low side, 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 all is the improvement projects that propose on Cu-Cr-Sb system basis, but the tensile strength of these steel grades is all below 550MPa, intensity is on the low side, in addition, because Sb element fusing point is lower, be a kind of hot-short element that causes easily, improper as hot rolling technology control, more be easy to generate surface crack.
Summary of the invention
The objective 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 ℃ in 20wt% sulfuric acid that corrosion resistance nature is more than 50 times of Q235B steel under 24 hours conditions of solution, the approaching also 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 technology 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 behind 1150-1250 ℃ of heat tracing 120-180min, wherein finishing temperature is 800-900 ℃, and after laminar flow be chilled to 660-750 ℃ and batch, speed of cooling 20-40 ℃/s.
Below technical scheme of the present invention is made schematic illustration.
The effect and the mechanism of each alloying element of the present invention are as follows:
C element: C is one of element of indispensable raising intensity in the steel, but, therefore, take all factors into consideration intensity and corrosion resistance nature because C can make the corrosion resistance nature deterioration of steel, 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 improves intensity with the solution strengthening form, also be simultaneously the deoxidant element in the steel, but content can not be too high, in order to avoid reduce the toughness and the welding property of steel, so Si content of the present invention is set at 0.10%-0.50%.
The Mn element: in steel, add an amount of Mn, not only can improve the intensity of steel, and can reduce the transformation temperature of steel by the solution strengthening of Mn, crystal grain thinning, the over-all properties of raising steel, Mn content of the present invention is set at 0.20%-1.00%.
P and S element: P cause segregation easily in steel, worsen welding property, significantly reduce the impelling strength of steel, improve brittle transition temperature; S easily combines production MnS and is mingled with Mn, influence 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 the certain condition, thereby reduces the corrosion speed of steel.The protectiveness of Cu enrichment in rusty scale can greatly improvement rusty scale.Suitable S and Cu effect can form the Cu2S protective membrane, play the corrosion mitigation effect; Cr and Ni have only to cooperate 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, and effect is more obvious.In addition, the Ni element can reduce the hot-short influence 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 fine and close more, reduce erosion rate, and Ti helps 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 good more, and promptly the TiC particle is separated out in ferrite after alternate or phase transformation, produces intensive precipitation strength effect; But when Ti content＞0.15%, high temperature is more in the thick TiN amount of austenite for abundant solid solution down, worsens the toughness of steel on the contrary, and thick TiN and the potential difference between matrix are bigger, can become the corrosive source again, 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 the 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 the Sb element to the hot-short Effect on Performance of steel simultaneously, rolling technology control 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 present embodiment corrosionproof steel against sulfuric acid at dew point is as shown in table 1, and all the other are Fe and unavoidable impurities.
Table 1 implementation column 1 chemical ingredients
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 behind 1250 ℃ of heat tracing 180min, finishing temperature is 820 ℃, it is after laminar flow is chilled to 690 ℃ batches, 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 unavoidable impurities.Corrosion test adopts sulfuric acid to soak experiment entirely, with reference to national standard JB/T7901-1999.Experiment condition is: soaked entirely 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 in 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 regarded as being included in spirit of the present invention, scope and the content.
Claims (3)
1. 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.
2. the preparation method of tensile strength 〉=800Mpa level corrosionproof steel against sulfuric acid at dew point according to claim 1, it is characterized in that, this method is: the slab that will have with the described tensile strength of claim 1 〉=800Mpa level corrosionproof steel against sulfuric acid at dew point same composition rolls into coiled sheet behind 1150-1250 ℃ of heat tracing 120-180min, wherein finishing temperature is 800-900 ℃, and after laminar flow be chilled to 660-750 ℃ and batch, speed of cooling 20-40 ℃/s.
3. 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;
And described corrosionproof steel against sulfuric acid at dew point is via following prepared:
(1) prepares raw materials for metallurgy according to the composition of described corrosionproof steel against sulfuric acid at dew point, and smelt and cast slab;
(2) described slab is rolled into coiled sheet behind 1150-1250 ℃ of heat tracing 120-180min, wherein, finishing temperature is 800-900 ℃;
(3) described coiled sheet is chilled to 660-750 ℃ through laminar flow and batches, speed of cooling 20-40 ℃/s.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106282831A (en) * | 2015-05-25 | 2017-01-04 | 宝山钢铁股份有限公司 | A kind of high-strength container weather resisting steel and manufacture method thereof |
| JPWO2015147166A1 (en) * | 2014-03-28 | 2017-04-13 | 日新製鋼株式会社 | Steel plate excellent in acid dew point corrosion resistance, manufacturing method, and exhaust gas flow path component |
| CN108342662A (en) * | 2018-02-23 | 2018-07-31 | 柳州钢铁股份有限公司 | A kind of yield strength 550MPa grade high-strength weathering steels |
| CN110438402A (en) * | 2019-09-05 | 2019-11-12 | 首钢集团有限公司 | A kind of 1000Mpa grades of resistant to sulfuric acid dew point corrosion bolting steel and preparation method thereof |
| CN115637391A (en) * | 2022-11-07 | 2023-01-24 | 鞍钢股份有限公司 | 550 MPa-grade sulfuric acid dew point corrosion resistant rare earth steel and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPWO2015147166A1 (en) * | 2014-03-28 | 2017-04-13 | 日新製鋼株式会社 | Steel plate excellent in acid dew point corrosion resistance, manufacturing method, and exhaust gas flow path component |
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| CN108342662A (en) * | 2018-02-23 | 2018-07-31 | 柳州钢铁股份有限公司 | A kind of yield strength 550MPa grade high-strength weathering steels |
| CN110438402A (en) * | 2019-09-05 | 2019-11-12 | 首钢集团有限公司 | A kind of 1000Mpa grades of resistant to sulfuric acid dew point corrosion bolting steel and preparation method thereof |
| CN115637391A (en) * | 2022-11-07 | 2023-01-24 | 鞍钢股份有限公司 | 550 MPa-grade sulfuric acid dew point corrosion resistant rare earth steel and manufacturing method thereof |
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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, JIANGSU PROVINCE/SHA-STEEL, Co.,Ltd. Registration number: Y2021980008699 |