CN103160753B - A kind of containing Zr corrosionproof steel against sulfuric acid at dew point plate and manufacture method thereof - Google Patents
A kind of containing Zr corrosionproof steel against sulfuric acid at dew point plate and manufacture method thereof Download PDFInfo
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- CN103160753B CN103160753B CN201110418531.9A CN201110418531A CN103160753B CN 103160753 B CN103160753 B CN 103160753B CN 201110418531 A CN201110418531 A CN 201110418531A CN 103160753 B CN103160753 B CN 103160753B
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Abstract
The invention provides a kind of containing Zr corrosionproof steel against sulfuric acid at dew point plate and manufacture method thereof, its composition: C:0.02% ~ 0.15%, Si:0.15% ~ 0.55%, Mn:0.50% ~ 1.60%, P :≤0.020%, S :≤0.020%, Ni:0.08% ~ 0.30%, Cu:0.20% ~ 0.60%, Cr:0.30% ~ 1.50%, Sb:0.04% ~ 0.30%, Zr:0.01% ~ 0.05%, Als:0.015% ~ 0.045%, Nb :≤0.07%, Ti:0.01% ~ 0.05%, surplus is Fe and inevitable impurity.Its method comprises smelting and rolling, and be characterized in the Heating temperature 1210 ± 20 DEG C of steel billet, rolling temperature 1070 ~ 850 DEG C, final pass draught >=30%, two-phase region speed of cooling 10 ~ 15 DEG C/s, final cooling temperature 660 ~ 550 DEG C, rolls rear air cooling.Steel grade of the present invention has good corrosion resistance nature and good welding property under sour gas corrosion environment, and manufacturing process is simple, is specially adapted to the equipment that acid attack easily appears in the industries such as oil, Coal Chemical Industry, electric power, and on transport pipe and chimney.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, particularly relate to a kind of containing Zr corrosionproof steel against sulfuric acid at dew point plate and manufacture method thereof.
Background technology
The most general a kind of erosional forms run in the industries such as sour gas corrosion is oil, chemical industry, electric power, both can form uniform corrosion to equipment and also can form local corrosion.Sulfuric acid dew point corrosion resistant generally appears at boiler preheater and economizes gas fittings, and on transport pipe and chimney.Boiler fuel used, as all contained a large amount of sulphur (S) in heavy oil and coal, becomes sulfurous gas (SO through combustion decomposition
2) and sulphur trioxide (SO
3), to be combined with water vapor in dew-point temperature and to become sulfuric acid (H
2sO
4) there is strong corrosive nature by rare thickening to equipment.SO
2can cause the acidification of metallic surface thin liquid film, its existence can cause the booster action of corrosion product autocatalysis.
Steel for resisting sulfuric acid dew point corrosion is one not only sulfuric acid dew point corrosion resistant but also atmospheric corrosion resistance steel grade.Corrosionproof steel against sulfuric acid at dew point design of alloy is after 1933 are born in the weathering steel of the U.S., to the research of sulphuric acid dew point condensation phenomenon, find that the CORTEN steel containing the alloying element such as certain C u, P, Cr, Ni has certain solidity to corrosion, as the beginning, this low alloy steel is started the air preheater being applied to boiler first.The copper adding 0.2% ~ 0.5% in initial discovery steel greatly can improve the solidity to corrosion of steel to various concentration sulphuric acid, one of copper basal component becoming corrosionproof steel against sulfuric acid at dew point.
Japan exploitation corrosionproof steel against sulfuric acid at dew point be mainly divided into two classes according to environment for use: (1) with 0.2% ~ 0.5%Cu, > 0010%S for matrix, add a small amount of Sn and Sb element, its compound becomes the inhibitor reacted to hydrogen; (2) for the IV corrosive environment of high temperature, high-concentration sulfuric acid, with Cu, Cr or Cu of CORTEN steel homologous ray, Cr, Ni based on develop.As described in examined patent publication 43-14585 publication, compound is added Cu, Sb and is had corrosion resistance to sulfuric acid dew point and applied confirmation.
The domestic Study and Development for corrosionproof steel against sulfuric acid at dew point is started late, the steel grade of component system and use Standard General Japanese, wherein typically there are the B485NL of In Baosteel, the 10CrlCu of Anshan iron and steel plant, in addition ND (09CuCrSb) steel, the Ji 12MnCuCr of steel and the NS corrosionproof steel against sulfuric acid at dew point product of Baosteel one steel company of Jiangyin special steel.
The CORTEN steel of the U.S. and the B485NL of domestic In Baosteel, the 10CrlCu of Anshan iron and steel plant, the 12MnCuCr of Ji steel is Cr, Cu system steel (publication number: 90101258.0), but eliminate resistance to sulphuric acid dew point good element S n and Sb in the design of Cr, Cu set member, in sour environment, its solidity to corrosion is unsatisfactory.
As mentioned above, the desired steel plate at sour gas corrosion environment with good corrosion resistance nature and good welds performance.Also there is no production technology preferably now.
Summary of the invention
The object of the invention is to the deficiency overcome existing for prior art, a kind of steel plate and the manufacture method thereof under sour gas corrosion environment with good corrosion resistance nature and good welds performance are provided.
The present invention is achieved in that the moiety weight percent (Wt%) that this contains Zr corrosionproof steel against sulfuric acid at dew point plate is: C:0.02% ~ 0.15%, Si:0.15% ~ 0.55%, Mn:0.50% ~ 1.60%, P :≤0.020%, S :≤0.020%, Ni:0.08% ~ 0.30%, Cu:0.20% ~ 0.60%, Cr:0.30% ~ 1.50%, Sb:0.04% ~ 0.30%, Zr:0.01% ~ 0.05%, Als:0.015% ~ 0.045%, Nb :≤0.07%, Ti:0.01% ~ 0.05%, surplus is Fe and inevitable impurity.
The present invention adds Zr in the alloy, and Zr is a Strong oxdiative thing, strong nitride forming element. and its compound not only fusing point is high (as ZrO
2fusing point is 2677 DEG C, and ZrN fusing point is 3255 DEG C), hardness is also high, can suppress Austenite Grain Growth in steel, and the ferrite in steel is also fine ferrite grain.Grain refining can improve the homogeneity of corrosion, particularly favourable to resistance to local corrosion.The corrosion resistance nature of Zr also depends on their dense oxidation film ZrO
2and the passivation behavior in corrosive medium, the passive potential region of Zr is little, has transpassivation phenomenon, thus has and improves sulfuric acid dew point corrosion resistant ability; Zr element can effectively promote that acicular ferrite is formed, and improves the toughness of weld seam significantly.
Present component design reason is as follows:
One of important feature of the present invention is the selection of C element, and carbon content is maximum no more than 0.30%, and C element is strengthening element, and carbon content is on the low side by the intensity of infringement material, selects carbon content 0.02% ~ 0.15%.Reduce carbon content, be conducive on the one hand improving toughness, can significantly improve Plate Welding performance simultaneously.
Si strengthening element, is solid-solution in the yield strength that ferrite improves steel, lower than 0.15%, can increases steel making working procedure cost.Higher than 0.50%, in this composition combination, easily make slab produce the regeneration iron sheet being difficult to removal, affect the surface quality of finished steel plate.Therefore determine that its scope is 0.15% ~ 0.55%.
Mn is mainly dissolved in ferrite and plays strengthening effect, improves the hardening capacity of steel, the element certainly existed when being again and smelting in steel.Intensity rank level according to reaching determines its content range, but high lower than 0.15% pair of smelting requirements, and increase cost, content too Gao Shiyi causes segregation, therefore determines that its scope is 0.50 ~ 1.60%.
P is easy to cause segregation, to weldability and processability unfavorable.For ensureing weldability and processability requirement, the present invention controls it lower than 0.020%.
S is harmful element, and from mechanical property, be more low better naturally, but too low meeting causes process cost to increase, the present invention controls it lower than 0.020%.
Ni is precious metal element, improves hardening capacity element, and improve the intensity of steel and do not reduce its toughness, its scope playing obvious corrosion-resistant effect is more than 1.0%, suitably adds surface C u when this element mainly also can take precautions against heating of plate blank and splits phenomenon.For controlling cost, limiting its scope is 0.08 ~ 0.30%.
Cu has good result for raising solidity to corrosion, and necessary content is 0.20%, but content is more than 0.60%, and its effect reaches capacity, and therefore limiting its scope is 0.20% ~ 0.60%.
Cr improves hardening capacity element strongly, carbide, and with Cu with the use of the solidity to corrosion improving steel, necessary amount is 0.30%, and therefore limiting its content range is 0.30 ~ 1.50%.
Sb improves solidity to corrosion effective element, and it forms the dense oxidation film being rich in the elements such as Sb, Zr, Cu, Cr higher than matrix several times of one deck densification on surface, thus has high sulfuric-resisting dew point corrosion corrosive power; Do not have effect lower than 0.04%, be greater than 0.30% owing to there is hot-work deterioration, therefore its content is advisable between 0.04% ~ 0.30%.
The nitrogen killer that Als is traditional, forming AlN can fining austenite grains, and therefore limiting its content range is 0.015% ~ 0.045%.
The strong carbonitride-forming elements of Zr, forms ZrN, ZrC in soaking with reheat in process and all can stop Austenite Grain Growth, fining austenite grains, even if deformation also can obtain superfine crystal particle under high temperature austenite recrystallization zone.Also can control the form of sulfide, improve transverse impact toughness, improve the welding property of steel.The erosion rate of nanoscale grain size lower than the erosion rate of typical die, along with the reduction erosion rate of nanocrystalline grain size also reduces.Zr corrosion resistance nature depends on their oxide film ZrO2 and the passivation behavior in corrosive medium.The oxide compound of Zr is formed than the oxide compound of Ti can be lower, that is more can the tissue of refinement coarse grain heat affect zone.Zr element can effectively promote that acicular ferrite is formed, and improves the toughness of weld seam significantly.The content range of Zr should be limited to 0.010% ~ 0.050%.
The strong carbonitride-forming elements of Ti, forms TiN, TiC in soaking with reheat in process and all can stop Austenite Grain Growth, fining austenite grains.Ti content range should be limited to 0.010% ~ 0.050%.
Can postpone austenite recrystallization during Nb hot rolling and reach the object of crystal grain thinning, in cooling subsequently and course of hot rolling, NbCN disperse educt, plays precipitation strength effect, raising intensity.Reheating in process, stoping Austenite Grain Growth.Because when Nb content reaches 0.07%, Grain refinement reaches capacity.So limiting its upper content limit is 0.07%.
The present invention comprises smelting and rolling containing the manufacture method of Zr corrosionproof steel against sulfuric acid at dew point plate, be characterized in that the Heating temperature of steel billet is 1210 ± 20 DEG C, be rolled in austenite recrystallization district and non-recrystallization zone, temperature is crossed high energy consumption and is raised, and the oxidational losses of steel billet is large; Start rolling temperature is limited to less than 1070 DEG C, and the plasticity of steel is good, and intensity is low, is easy to rolling, and base can not cause size bad and the shape defects such as nose, wooden dipper be bent occur and affects normally carrying out of lower step operation end to end because of the temperature difference; Finishing temperature is greater than 850 DEG C, but finishing temperature is higher than 950 DEG C, and grain refining is not enough, and affect strengthening effect, lower than 850 DEG C, the load of milling train can increase, and the transverse and longitudinal poor performance mutation of steel plate is large; Final pass draught >=30% of rolling; Suitably spray water 850 ~ 700 DEG C of two-phase regions accelerating cooling, speed of cooling is 10 ~ 15 DEG C/s, final cooling temperature 660 ~ 550 DEG C, and final cooling temperature, lower than 660 DEG C, form crystal grain and substantially do not grow up, but too low temperature is for roll bending, is difficult to curling; Roll laggard line space cold.
Steel grade of the present invention has good corrosion resistance nature and good welding property under sour gas corrosion environment, and manufacturing process is simple, this steel grade is specially adapted to the industries such as oil, Coal Chemical Industry, electric power and easily occurs the boiler preheater of acid attack and economize gas fittings, and on transport pipe and chimney.
Embodiment
Below by embodiment, the present invention is further illustrated.
The embodiment of the present invention, according to the component proportion of technical scheme, carries out smelting and rolling at use for laboratory 80kg.The chemical composition of steel grade of the present invention is in table 1.The chemical composition of embodiment of the present invention steel is in table 2.The rolling technology of embodiment of the present invention steel is in table 3.The performance of embodiment of the present invention steel is in table 4.
The chemical composition (wt%) of table 1 steel grade of the present invention
The chemical composition (wt%) of table 2 embodiment of the present invention steel
| C | Si | Mn | P | S | Cu | Cr | Ni | Als | Sb | Nb | Ti | Zr | |
| Comparative example 1 | 0.10 | 0.30 | 0.85 | 0.010 | 0.006 | 0.25 | 0.65 | - | - | - | - | - | - |
| Comparative example 2 | 0.09 | 0.25 | 0.54 | 0.015 | 0.004 | 0.26 | 0.95 | 0.46 | - | 0.05 | - | - | - |
| Embodiment 1 | 0.08 | 0.35 | 127 | 0.009 | 0.009 | 0.38 | 0.85 | 0.17 | 0.015 | 0.09 | 0.015 | 0.021 | 0.011 |
| Embodiment 2 | 0.14 | 0.20 | 0.53 | 0.008 | 0.005 | 0.22 | 0.35 | 0.09 | 0.030 | 0.05 | 0.028 | 0.022 | 0.025 |
| Embodiment 3 | 0.04 | 0.19 | 0.99 | 0.007 | 0.008 | 0.55 | 1.45 | 0.15 | 0.018 | 0.19 | 0.065 | 0.020 | 0.015 |
| Embodiment 4 | 0.10 | 0.25 | 0.78 | 0.011 | 0.007 | 0.25 | 0.89 | 0.18 | 0.043 | 0.15 | - | 0.045 | 0.011 |
| Embodiment 5 | 0.07 | 0.38 | 149 | 0.016 | 0.005 | 0.26 | 120 | 0.30 | 0.023 | 0.29 | - | 0.031 | 0.020 |
| Embodiment 6 | 0.08 | 0.21 | 122 | 0.009 | 0.006 | 0.26 | 125 | 0.25 | 0.034 | 0.22 | - | 0.026 | 0.012 |
| Embodiment 7 | 0.12 | 0.52 | 0.89 | 0.018 | 0.003 | 0.26 | 0.40 | 0.12 | 0.025 | 0.07 | - | 0.012 | 0.029 |
The rolling technology of table 3 embodiment of the present invention steel
| Heating temperature DEG C | Start rolling temperature DEG C | Finishing temperature DEG C | Final cooling temperature DEG C | |
| Embodiment 1 | 1210 | ＜1070 | 855 | 645 |
| Embodiment 2 | 1220 | ＜1070 | 875 | 650 |
| Embodiment 3 | 1225 | ＜1070 | 850 | 580 |
| Embodiment 4 | 1200 | ＜1070 | 890 | 660 |
| Embodiment 5 | 1230 | ＜1070 | 865 | 605 |
| Embodiment 6 | 1225 | ＜1070 | 860 | 620 |
| Embodiment 7 | 1195 | ＜1070 | 850 | 625 |
The performance of table 4 embodiment of the present invention steel
| Rel(MPa) | Rm(MPa) | A(％) | 20 DEG C, 20%H2SO4 solution, erosion rate (g/m 2h) | |
| Comparative example 1 | 385 | 542 | 25.6 | 25.0 |
| Comparative example 2 | 320 | 430 | 38.0 | 11.4 |
| Embodiment 1 | 385 | 530 | 31.0 | 8.58 |
| Embodiment 2 | 370 | 490 | 34.0 | 7.31 |
| Embodiment 3 | 450 | 595 | 26.5 | 4.61 |
| Embodiment 4 | 420 | 580 | 32.0 | 8.49 |
| Embodiment 5 | 400 | 525 | 29.0 | 4.98 |
| Embodiment 6 | 385 | 535 | 27.5 | 6.58 |
| Embodiment 7 | 370 | 500 | 29.5 | 9.05 |
Claims (1)
1. the manufacture method containing Zr corrosionproof steel against sulfuric acid at dew point plate, it is characterized in that the moiety weight percent of steel plate is: C:0.02% ~ 0.15%, Si:0.15% ~ 0.55%, Mn:0.50% ~ 1.60%, P :≤0.020%, S :≤0.020%, Ni:0.08% ~ 0.30%, Cu:0.20% ~ 0.60%, Cr:0.30% ~ 1.50%, Sb:0.04% ~ 0.30%, Zr:0.01% ~ 0.029%, Als:0.015% ~ 0.045%, Nb :≤0.07%, Ti:0.01% ~ 0.05%, surplus is Fe and inevitable impurity; Described manufacture method comprises smelting and rolling, and the Heating temperature of steel billet is 1210 ± 20 DEG C, rolling temperature 1070 ~ 850 DEG C, final pass draught >=30%, two-phase region accelerating cooling, speed of cooling 10 ~ 15 DEG C/s, and final cooling temperature 660 ~ 550 DEG C, rolls rear air cooling.
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| CN103589972B (en) * | 2013-10-10 | 2015-04-29 | 中天钢铁集团有限公司 | Low-cost low alloy steel for resistance to dew point corrosion of sulfuric acid as well as production process and application of low alloy steel |
| CN106435129B (en) * | 2016-06-30 | 2021-04-02 | 宝钢德盛不锈钢有限公司 | Ferritic stainless steel with good toughness and corrosion resistance and manufacturing method thereof |
| CN106521317B (en) * | 2016-11-18 | 2018-06-26 | 东北大学 | A kind of manufacturing method containing acicular ferrite low-carbon Thin Strip Steel |
| JP7385106B2 (en) * | 2019-07-23 | 2023-11-22 | 日本製鉄株式会社 | steel material |
| CN111088463B (en) * | 2020-01-21 | 2021-04-27 | 鞍钢股份有限公司 | Steel bar resistant to corrosion in low-temperature atmospheric environment and production method thereof |
| CN112779478B (en) * | 2020-12-25 | 2022-09-16 | 鞍钢股份有限公司 | Weather-resistant steel plate for 390 MPa-grade high-speed train bogie and manufacturing method thereof |
| CN112760567B (en) * | 2020-12-25 | 2022-09-16 | 鞍钢股份有限公司 | Steel plate with excellent toughness for high-speed train bogie and manufacturing method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705441A (en) * | 2009-11-24 | 2010-05-12 | 上海亘富冶金科技有限公司 | High-strength low-alloy steel resistant to sulfuric acid dew point corrosion |
| CN102021498A (en) * | 2009-09-18 | 2011-04-20 | 鞍钢股份有限公司 | Low-alloy sulfuric acid-resistant dew point corrosion steel plate and production method thereof |
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| JP2000073139A (en) * | 1998-08-26 | 2000-03-07 | Nkk Corp | Steel for bolt excellent in sulfuric acid corrosion resistance |
| JP2000199029A (en) * | 1999-01-07 | 2000-07-18 | Nippon Steel Corp | Steel sheet and steel pipe excellent in carbon dioxide corrosion resistance and sulfide stress cracking resistance and production thereof |
| JP4374320B2 (en) * | 2005-02-28 | 2009-12-02 | 新日本製鐵株式会社 | Steel with excellent resistance to sulfuric acid dew point corrosion |
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| CN102021498A (en) * | 2009-09-18 | 2011-04-20 | 鞍钢股份有限公司 | Low-alloy sulfuric acid-resistant dew point corrosion steel plate and production method thereof |
| CN101705441A (en) * | 2009-11-24 | 2010-05-12 | 上海亘富冶金科技有限公司 | High-strength low-alloy steel resistant to sulfuric acid dew point corrosion |
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