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High-nickel steel for low-temperature container and manufacturing method of high-nickel steel

A low-temperature container and manufacturing method technology, applied in the field of metallurgical steelmaking, can solve problems such as the inability to meet the technical requirements of 9Ni steel, and achieve the effects of increasing the quantity, reducing harmful elements, and improving strength

Active Publication Date: 2020-03-06
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of the 5Ni steel manufactured by these two patents meets the technical requirements for 5Ni steel in EN10028-4, but cannot meet the technical requirements for 9Ni steel
[0004] The thesis on 5Ni steel is also a study of its rolling process, heat treatment process, structure, etc., and strives to better meet the technical requirements for 5Ni steel in EN10028-4, but it cannot meet the technical requirements of 9Ni steel

Method used

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  • High-nickel steel for low-temperature container and manufacturing method of high-nickel steel
  • High-nickel steel for low-temperature container and manufacturing method of high-nickel steel
  • High-nickel steel for low-temperature container and manufacturing method of high-nickel steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A method for manufacturing high-nickel steel for cryogenic vessels, comprising the following steps:

[0047] 1) 100 tons of oxygen top-blown converter is used for smelting, and the carbon temperature is coordinated during the blowing process;

[0048] 2) Desulfurization of reducing slag made in LF furnace, reducing inclusions and adjusting composition. The holding time of VD furnace is 18min. Determination of H, O content, [H] = 1.0ppm, [O] = 15ppm;

[0049] 3) The whole process of continuous casting is protected and poured, and the billet size is 300mm;

[0050] 4) The slab is slowly cooled in a slow cooling pit for 60 hours;

[0051] 5) Two-stage controlled rolling, the first-stage start-rolling temperature is 1100°C, the second-stage start-rolling temperature is 880°C, and the final rolling temperature is 850°C. The temperature is 190°C, the redness temperature is 310°C, and the thickness of the steel plate is 30mm;

[0052] 6) Heat treatment: Put the steel plat...

Embodiment 2

[0054] A method for manufacturing high-nickel steel for cryogenic vessels, comprising the following steps:

[0055] 1) 100 tons of oxygen top-blown converter is used for smelting, and the carbon temperature is coordinated during the blowing process;

[0056] 2) Desulfurization of reducing slag made in LF furnace, reducing inclusions and adjusting composition. The holding time of VD furnace is 18min. Determination of H and O content, [H] = 1.2ppm, [O] = 16ppm;

[0057] 3) The whole process of continuous casting is protected and poured, and the billet size is 300mm;

[0058] 4) The slab is slowly cooled in a slow cooling pit for 60 hours;

[0059] 5) Two-stage controlled rolling, the first-stage start-rolling temperature is 1100°C, the second-stage start-rolling temperature is 860°C, and the final rolling temperature is 830°C. The temperature is 180°C, the redness temperature is 300°C, and the thickness of the steel plate is 30mm;

[0060] 6) Heat treatment: Put the steel p...

Embodiment 3

[0062] A method for manufacturing high-nickel steel for cryogenic vessels, comprising the following steps:

[0063] 1) 100 tons of oxygen top-blown converter is used for smelting, and the carbon temperature is coordinated during the blowing process;

[0064] 2) Desulfurization of reducing slag made in LF furnace, reducing inclusions and adjusting composition. The holding time of the VD furnace is 20min. Determination of H and O content, [H] = 1.2ppm, [O] = 16ppm;

[0065] 3) The whole process of continuous casting is protected and poured, and the billet size is 300mm;

[0066] 4) The slab is slowly cooled in a slow cooling pit for 60 hours;

[0067] 5) Two-stage controlled rolling, the first-stage start-rolling temperature is 1100°C, the second-stage start-rolling temperature is 900°C, and the final rolling temperature is 845°C. The temperature is 190°C, the redness temperature is 320°C, and the thickness of the steel plate is 30mm;

[0068] 6) Heat treatment: Put the ste...

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Abstract

The invention relates to high-nickel steel for a low-temperature container. The high-nickel steel comprises, by weight, 0.01%-0.10% of C, 0.10%-0.25% of Si, 0.50%-1.50% of Mn, 5.0%-6.0% of Ni, 0.05%-0.30% of Mo, 0.30%-0.90% of Cr, 0.03%-0.20% of RE, less than or equal to 0.005% of S, less than or equal to 0.008% of P, and the balance Fe and impurities. By adding a certain amount of the Cr, the Moand rare earth into the steel, the strength and the low-temperature toughness reach the standard requirements of 9% Ni steel; rare earth elements are added, so that molten steel is purified, and the effect of harmful elements is greatly reduced; the rare earth elements are mainly dissolved in austenite, so that the strength of a matrix and the Ni content of the matrix can be improved, the number of the residual austenite is increased, and the toughness of the steel is improved; and controlled rolling and online quenching and two-phase region quenching and high-temperature tempering heat treatment are adopted by a manufacturing method after smelting. The use amount of nickel is greatly reduced, the production cost of the steel is reduced, and the method is especially suitable for construction of liquefied natural gas (LNG) storage tanks.

Description

technical field [0001] The invention relates to the field of metallurgy and steelmaking, in particular to a high-nickel steel for low-temperature containers and a manufacturing method thereof. Background technique [0002] With the increasing use of natural gas worldwide, the demand for 9% Ni steel for the construction of liquefied natural gas (LNG) storage tanks is also increasing rapidly. The cost of 9% Ni steel remains high because its Ni content reaches 9%. The present invention intends to adopt 5% Ni steel to replace the traditional 9% Ni steel, and make up for the Ni by adding an appropriate amount of Cr, Mo and rare earth elements. The impact of the reduction of the content on the strength and low temperature toughness of the steel plate. [0003] Patents on 5Ni steel include CN201510815584, a method for producing high-toughness 5Ni steel medium-thick plates by online quenching, and CN201410600875, a 5Ni steel plate for low-temperature pressure vessels and its produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/02C22C38/04C22C38/44C21D8/02C22C33/04
CPCC21D8/0205C21D8/0226C21D8/0263C21D2211/00C21D2211/001C22C33/04C22C38/005C22C38/02C22C38/04C22C38/44
Inventor 朱莹光张宏亮吴铎王超王飞龙侯家平杜林郑欣
Owner ANGANG STEEL CO LTD
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