CN102766754A - Heat treatment method for improving corrosion resistance of steel plate for cargo oil tank of crude oil carrier - Google Patents
Heat treatment method for improving corrosion resistance of steel plate for cargo oil tank of crude oil carrier Download PDFInfo
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- CN102766754A CN102766754A CN2012102258324A CN201210225832A CN102766754A CN 102766754 A CN102766754 A CN 102766754A CN 2012102258324 A CN2012102258324 A CN 2012102258324A CN 201210225832 A CN201210225832 A CN 201210225832A CN 102766754 A CN102766754 A CN 102766754A
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Abstract
The invention discloses a heat treatment method for improving the corrosion resistance of a steel plate for a cargo oil tank of a crude oil carrier. The method comprises the following steps of: heating, namely allowing the steel plate in a room temperature state to directly enter a non-oxidation roller hearth type heat treatment furnace at furnace temperature, calculating heating time according to the temperature equalization time of unit thickness of 1.8 to 4.0min/mm, and heating to the tempering temperature of 200 to 650 DEG C; preserving heat, namely obtaining heat preservation time according to the temperature equalization time of unit thickness of 0.2 to 3.0min/mm after the steel plate is heated to the tempering temperature, and preserving heat; and cooling, namely air-cooling to room temperature. The reasonable tempering heat treatment process design is adopted, so that steel grades have excellent plate shapes, mechanical properties and corrosion resistance. The obtained steel for the cargo oil tank of the crude oil carrier simultaneously has excellent resistance to the general corrosion and the local corrosion in two environments, namely a crude oil corrosion environment and a seawater corrosion environment.
Description
Technical field
The invention belongs to the metal heat treatmet field, relate to a kind of tempering process of steel, specifically a kind of heat treating method that improves the crude oil carrier oil cargo tank with the steel plate corrosion resistance nature.
Background technology
In recent years, Japan has proposed to the notion of crude oil carrier with corrosion-resistant steel, hopes that substituting coating with corrosion-resistant steel carries out corrosion prevention.Propose in the IMO design of holding in February, 2010 and the 53rd meeting of equipment subcommittee (DE) and passed through " crude oil carrier oil cargo tank coating and anticorrosion " and alternative scheme " crude oil carrier oil cargo tank corrosion-resistant steel standard of performance and testing sequence ".After coating and corrosion-resistant steel standard are passed through; The shipowner can select coating or corrosion-resistant steel to carry out anticorrosion; Because the coating antiseptic standard has proposed very strict requirement to shipyard at the processing mode of building boats and ships process floating coat, surface clearness, coating process etc.; And the cost that coating expends is higher, and it is anticorrosion that obviously more shipowner can select corrosion-resistant steel to carry out.Therefore, the market outlook of crude oil carrier corrosion resistant steel for cargo oil tanks are just very huge.In the prior art, there is not a kind of temper tempering heat treatment method of crude oil carrier corrosion resistant steel for cargo oil tanks well to be applicable to the thermal treatment of crude oil carrier corrosion resistant steel for cargo oil tanks.
Summary of the invention
The purpose of this invention is to provide a kind of heat treating method that improves the crude oil carrier oil cargo tank with the steel plate corrosion resistance nature, this method guarantees that through adopting rational tempering heat treatment process design steel grade has excellent plate shape, mechanical property, corrosion resistance nature.The crude oil carrier steel product for cargo oil tank that obtains has excellent in general corrosion and local corrosive resistivity under two kinds of environment of crude oil corrosive environment and corrosive environment of sea water simultaneously.
The objective of the invention is to realize through following technical scheme:
A kind of heat treating method that improves the crude oil carrier oil cargo tank with the steel plate corrosion resistance nature is characterized in that this method specific requirement is following:
1) heating: steel plate directly gets into from room temperature state in the non-oxidation roller hearth heat-treated furnace of furnace temperature, calculates by unit thickness samming time 1.8～4.0min/mm and is heated to tempering temperature heat-up time; Tempering temperature is: 200 ~ 650 ℃;
2) insulation: after steel plate is heated to tempering temperature, obtains soaking time by unit thickness samming time 0.2～3.0min/mm and be incubated;
3) cooling: air cooling is to room temperature;
The said unit thickness samming time begins to the heart portion arrival treatment production technological temperature required time of steel plate and the ratio of steel plate thickness for steel plate being got into stove.
The present invention guarantees that through adopting rational tempering heat treatment process design steel grade has excellent plate shape, mechanical property, corrosion resistance nature.The crude oil carrier steel product for cargo oil tank that obtains has excellent in general corrosion and local corrosive resistivity under two kinds of environment of crude oil corrosive environment and corrosive environment of sea water simultaneously.
Description of drawings
Fig. 1 is the metallograph figure of 500 times of amplifications after the steel plate tempering of the present invention.
Embodiment
Select the crude oil carrier corrosion resistant steel for cargo oil tanks of TMCP state EH36 level for use, steel plate thickness is 6 ~ 50mm, and through selecting rational tempering heat treatment process, this steel plate has excellent resistivity to crude oil corrosive environment, corrosive environment of sea water.
Embodiment 1
The production technique of the crude oil carrier corrosion resistant steel for cargo oil tanks plate of present embodiment; Utilize Steckel mill production line or Heavy Plate Production line to produce, comprise converter or electrosmelting operation, external refining operation, vacuum-treat operation, continuous casting working procedure, slab reheat operation, controlled rolling operation and controlled chilling operation, tempering heat treatment operation.
Wherein, Improving the crude oil carrier oil cargo tank uses the heat treating method of steel plate corrosion resistance nature to be: to the thick EH36 level crude oil carrier corrosion resistant steel for cargo oil tanks plate of 6mm; Tempering temperature is 200 ℃; Be 24min (being 4.0min/mm) heat-up time, and soaking time is 10min (being 1.7min/mm), and air cooling is to room temperature then.The ys of steel plate is 425MPa, and tensile strength is 570MPa.
Embodiment 2
The production technique of the crude oil carrier corrosion resistant steel for cargo oil tanks plate of present embodiment; Utilize Steckel mill production line or Heavy Plate Production line to produce, comprise converter or electrosmelting operation, external refining operation, vacuum-treat operation, continuous casting working procedure, slab reheat operation, controlled rolling operation and controlled chilling operation, tempering heat treatment operation.
Wherein, Improving the crude oil carrier oil cargo tank uses the heat treating method of steel plate corrosion resistance nature to be: to the thick EH36 grade steel plate of 16mm, tempering temperature is 450 ℃, and be 36min (being 2.3min/mm) heat-up time; Soaking time is 16min (being 1.0min/mm), and air cooling is to room temperature then.The ys of steel plate is 445MPa, and tensile strength is 545MPa.Microstructure is seen accompanying drawing 1 after the tempering.
Embodiment 3
The production technique of the crude oil carrier corrosion resistant steel for cargo oil tanks plate of present embodiment; Utilize Steckel mill production line or Heavy Plate Production line to produce, comprise converter or electrosmelting operation, external refining operation, vacuum-treat operation, continuous casting working procedure, slab reheat operation, controlled rolling operation and controlled chilling operation, tempering heat treatment operation.
Wherein, Improving the crude oil carrier oil cargo tank uses the heat treating method of steel plate corrosion resistance nature to be: to the thick EH36 grade steel plate of 50mm, tempering temperature is 560 ℃, and be 155min (being 3.1min/mm) heat-up time; Soaking time is 30min (being 0.6min/mm), and air cooling is to room temperature then.The ys of steel plate is 430MPa, and tensile strength is 530MPa.
The steel plate of embodiment 1-3 has excellent resistivity to crude oil corrosive environment, corrosive environment of sea water, and uniform corrosion speed is 0.18 ~ 0.29mm/.
Except that the foregoing description, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (2)
1. heat treating method that improves the crude oil carrier oil cargo tank with the steel plate corrosion resistance nature is characterized in that this method specific requirement is following:
1) heating: steel plate directly gets into from room temperature state in the non-oxidation roller hearth heat-treated furnace of furnace temperature, calculates by unit thickness samming time 1.8～4.0min/mm and is heated to tempering temperature heat-up time; Tempering temperature is: 200 ~ 650 ℃;
2) insulation: after steel plate is heated to tempering temperature, obtains soaking time by unit thickness samming time 0.2～3.0min/mm and be incubated;
3) cooling: air cooling is to room temperature.
2. according to the heat treating method of the described raising crude oil carrier of claim 1 oil cargo tank with the steel plate corrosion resistance nature, it is characterized in that: the said unit thickness samming time begins to the heart portion arrival treatment production technological temperature required time of steel plate and the ratio of steel plate thickness for steel plate being got into stove.
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| CN2012102258324A CN102766754A (en) | 2012-07-03 | 2012-07-03 | Heat treatment method for improving corrosion resistance of steel plate for cargo oil tank of crude oil carrier |
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| CN2012102258324A CN102766754A (en) | 2012-07-03 | 2012-07-03 | Heat treatment method for improving corrosion resistance of steel plate for cargo oil tank of crude oil carrier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103060714A (en) * | 2013-01-28 | 2013-04-24 | 南京钢铁股份有限公司 | Corrosion-resistant low alloy steel plate for marine splash zones and production method thereof |
| CN114182075A (en) * | 2021-12-20 | 2022-03-15 | 江苏省沙钢钢铁研究院有限公司 | Heat treatment method of plastic die steel plate |
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| CN101638755A (en) * | 2009-08-21 | 2010-02-03 | 东北大学 | High-toughness and ultrahigh-strength wear-resistant steel plate and production method thereof |
| CN101660105A (en) * | 2008-08-26 | 2010-03-03 | 宝山钢铁股份有限公司 | High-strength extra-thick quenched and tempered steel plate with good obdurability matching and manufacturing method thereof |
| CN101928891A (en) * | 2010-08-23 | 2010-12-29 | 首钢总公司 | A low-cost high-strength wear-resistant steel plate and its production method |
| CN102115812A (en) * | 2011-03-24 | 2011-07-06 | 南京钢铁股份有限公司 | Prompt tempering heat treatment method for Q690D steel |
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2012
- 2012-07-03 CN CN2012102258324A patent/CN102766754A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101660105A (en) * | 2008-08-26 | 2010-03-03 | 宝山钢铁股份有限公司 | High-strength extra-thick quenched and tempered steel plate with good obdurability matching and manufacturing method thereof |
| CN101638755A (en) * | 2009-08-21 | 2010-02-03 | 东北大学 | High-toughness and ultrahigh-strength wear-resistant steel plate and production method thereof |
| CN101928891A (en) * | 2010-08-23 | 2010-12-29 | 首钢总公司 | A low-cost high-strength wear-resistant steel plate and its production method |
| CN102115812A (en) * | 2011-03-24 | 2011-07-06 | 南京钢铁股份有限公司 | Prompt tempering heat treatment method for Q690D steel |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103060714A (en) * | 2013-01-28 | 2013-04-24 | 南京钢铁股份有限公司 | Corrosion-resistant low alloy steel plate for marine splash zones and production method thereof |
| CN114182075A (en) * | 2021-12-20 | 2022-03-15 | 江苏省沙钢钢铁研究院有限公司 | Heat treatment method of plastic die steel plate |
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Application publication date: 20121107 |