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Easily-welded low-yield-ratio quenched and tempered oil storage tank steel plate and manufacturing method thereof

A low yield ratio, oil storage tank technology, applied in the field of metallurgy, can solve the problems of high cost, low yield ratio, unfavorable welding, etc., and achieve the effect of uniform and stable performance, good welding toughness, and low yield ratio

Inactive Publication Date: 2021-11-02
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method of oxide metallurgy has a great impact on the production rhythm, and the cost is high, and the method of controlled rolling and high temperature tempering after controlled cooling cannot meet the requirements of off-line quenching and tempering
[0006] CN104451386A discloses a production method of a steel plate with a low yield ratio for petroleum tanks. The steel plate with a low yield ratio is obtained by means of controlled rolling, air cooling, and high-temperature tempering, which cannot meet the requirements of off-line quenching and tempering
[0007] In order to obtain excellent welding performance of steel for petroleum storage tanks, the above-mentioned patents all adopt the method of low C composition design or oxide metallurgy; in order to obtain a low yield ratio, one method is to increase the content of solid solution elements, but It is unfavorable to welding; another method is to preferentially obtain part of the soft phase structure of ferrite through controlled rolling and air cooling, which is unfavorable to the overall uniformity of steel plate properties
None of the above-mentioned disclosed inventions solves the problem that steel plates for quenching and tempering petroleum storage tanks require large input energy welding while meeting the requirements of low yield ratio

Method used

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  • Easily-welded low-yield-ratio quenched and tempered oil storage tank steel plate and manufacturing method thereof
  • Easily-welded low-yield-ratio quenched and tempered oil storage tank steel plate and manufacturing method thereof
  • Easily-welded low-yield-ratio quenched and tempered oil storage tank steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The steel plate of this embodiment has a thickness of 12 mm and consists of the following components in weight percentage: C 0.09%, Si0.20%, Mn 1.53%, P0.011%, S 0.004%, Ni 0.22%, Ti 0.015% V 0.043 %, Mo 0.13%, and the rest are Fe and unavoidable impurities.

[0039] The manufacturing method of the easy-to-weld low yield ratio quenched and tempered oil storage tank steel plate of this embodiment includes: smelting and continuous casting process, heating and rolling process, and heat treatment process;

[0040] (1) Smelting and continuous casting process: molten iron pretreatment, converter smelting, LF refining, RH refining and slab continuous casting. In the smelting process, the content of sulfur and phosphorus in the molten steel is strictly controlled, the desulfurization of molten iron is ≤0.003%, the P of the slab is ≤0.010%, the LF soft blowing time is ≥10 minutes, the target temperature of the continuous casting tundish is 1534-1548℃, and the casting speed is requ...

Embodiment 2

[0046] The thickness of the steel plate in this embodiment is 18 mm, and it is composed of the following components in weight percentage: C 0.07%, Si0.20%, Mn 1.55%, P0.011%, S 0.004%, Ni 0.22%, Ti 0.015% V 0.048 %, Mo 0.11%, and the rest are Fe and unavoidable impurities.

[0047] The manufacturing method of the easy-to-weld low yield ratio quenched and tempered oil storage tank steel plate of this embodiment includes: smelting and continuous casting process, heating and rolling process, and heat treatment process;

[0048] (1) Smelting and continuous casting process: molten iron pretreatment, converter smelting, LF refining, RH refining and slab continuous casting. In the smelting process, the content of sulfur and phosphorus in the molten steel is strictly controlled, the desulfurization of molten iron is ≤0.003%, the P of the slab is ≤0.010%, the LF soft blowing time is ≥10 minutes, the target temperature of the continuous casting tundish is 1534-1548℃, and the casting spe...

Embodiment 3

[0053] The steel plate of this embodiment has a thickness of 21 mm and is composed of the following components in weight percentage: C 0.08%, Si 0.19%, Mn 1.52%, P 0.009%, S 0.005%, Ni 0.21%, Ti 0.013% V 0.045 %, Mo 0.10%, the rest is Fe and unavoidable impurities.

[0054] The manufacturing method of the easy-to-weld low yield ratio quenched and tempered oil storage tank steel plate of this embodiment includes: smelting and continuous casting process, heating and rolling process, and heat treatment process;

[0055] (1) Smelting and continuous casting process: molten iron pretreatment, converter smelting, LF refining, RH refining and slab continuous casting. In the smelting process, the content of sulfur and phosphorus in the molten steel is strictly controlled, the desulfurization of molten iron is ≤0.003%, the P of the slab is ≤0.010%, the LF soft blowing time is ≥10 minutes, the target temperature of the continuous casting tundish is 1534-1548℃, and the casting speed is re...

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Abstract

The invention discloses an easily-welded low-yield-ratio quenched and tempered oil storage tank steel plate and a manufacturing method thereof. The easily-welded low-yield-ratio quenched and tempered oil storage tank steel plate comprises the following chemical components in percentage by mass: 0.06 to 0.09 percent of C, 0.15 to 0.25 percent of Si, 1.50 to 1.70 percent of Mn, 0.010 to 0.030 percent of Ti, 0.040 to 0.050 percent of V, 0.08 to 0.15 percent of Mo, 0.20 to 0.30 percent of Ni, less than or equal to 0.012 percent of P, less than or equal to 0.008 percent of S and the balance of Fe and inevitable impurities. A quenched and tempered heat treatment method is adopted for the steel plate within the thickness range of 12-35 mm, the yield ratio is smaller than or equal to 0.90, and when heat input of the steel plate reaches 100 KJ / cm, the impact energy of the post-welding welding heat affected zone at -15 DEG C is larger than or equal to 80 J.

Description

technical field [0001] The application belongs to the technical field of metallurgy, and in particular relates to an easy-to-weld low yield ratio quenched and tempered petroleum storage tank steel plate and a manufacturing method thereof. Background technique [0002] Pressure vessels are pressure-bearing special equipment, and their safety has received extensive attention. Petroleum storage tank steel belongs to 610MPa grade quenched and tempered high-strength steel plate. Due to its large volume and high risk factor, its base metal performance and welded joint performance are strictly limited. In recent years, in order to stabilize the overall performance of the steel plate, many projects require the delivery state to be tempered at a temperature not lower than 600°C after off-line quenching and tempering, and the yield ratio is required to be ≤0.90, because the yield ratio increases significantly after quenching and tempering. , it is extremely difficult to produce. [...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/14C22C38/12C22C38/08C21D8/02C21D1/18
Inventor 朱延山曲锦波陆春洁赵辉
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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