Steel sheet for pressure vessel having excellent low-temperature lateral expansion, and method for manufacturing same

A pressure vessel and low temperature technology, which is applied in the field of steel plates for low temperature pressure vessels and its manufacture, can solve the problems of insufficient lateral low temperature expansion characteristics of steel, and achieve the effect of excellent lateral expansion characteristics.

Active Publication Date: 2022-04-12
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, since the invention described in the above Patent Document 1 is steel produced by typical normalizing treatment, there may be a problem that the lateral low-temperature expansion characteristics of the steel are insufficient even if Ni is added

Method used

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  • Steel sheet for pressure vessel having excellent low-temperature lateral expansion, and method for manufacturing same
  • Steel sheet for pressure vessel having excellent low-temperature lateral expansion, and method for manufacturing same

Examples

Experimental program
Comparison scheme
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Embodiment approach

[0069] Hereinafter, the present disclosure will be described in more detail with reference to Examples.

[0070] (Example)

[0071] After preparing the respective steel slabs having the compositional components shown in Table 1 below, these steel slabs were reheated at a temperature ranging from 1050°C to 1250°C. The reheated steel sheets are respectively subjected to hot rolling at a reduction ratio of 5% to 30% per pass to manufacture hot-rolled steel sheets. Then, after the hot-rolled steel sheets thus manufactured were air-cooled, the air-cooled hot-rolled steel sheets were subjected to heat treatment, intermediate heat treatment, and tempering under the conditions shown in Table 2 to manufacture pressure vessel steel sheets. In this case, the heat treatment time, the intermediate heat treatment time and the tempering time were kept constant: 80 minutes for steel type a, 105 minutes for steel type b, and 140 minutes for steel type c.

[0072] The phase fractions of tempe...

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Abstract

Provided are a steel sheet for a pressure vessel having excellent low-temperature lateral expansion, and a method for manufacturing the same. The steel plate for a pressure vessel according to the present invention contains, in wt%, 0.05% to 0.15% of C, 0.20% to 0.40% of Si, 0.3% to 0.6% of Mn, 0.015% or less of P, 0.015% or less of S, 0.02% to 0.10% of Al, 4.5% to 5.5% of Ni, 0.2% to 0.4% of Mo, 0.001% to 0.15% of Pd, and the balance of Fe and unavoidable impurities, and the steel sheet has a steel microstructure containing, in area fraction, 0.5% to 5.0% of retained austenite, 25% to 85% of tempered bainite, and the remainder of tempered martensite.

Description

technical field [0001] The present disclosure relates to thick steel plates for low-temperature pressure vessels, ships, storage tanks, structural steel, etc., and methods of manufacturing the same, and more particularly, to low-temperature pressure with a tensile strength on the order of 700 MPa having excellent lateral low-temperature expansion characteristics Steel plate for container and its manufacturing method. Background technique [0002] The high-strength thick steel plate material for low temperature use contains a three-phase mixed structure, the three-phase mixed structure includes retained austenite structure, tempered martensite structure and tempered bainite structure, and the low temperature use The high-strength thick steel plate material needs to be able to itself be used as a structural material for low-temperature use during construction, and thus, needs to have excellent strength and lateral low-temperature expansion characteristics. [0003] Meanwhile,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/08C22C38/12C21D1/18C21D8/02
CPCC22C38/12C22C38/02C22C38/08C22C38/04C22C38/002C21D9/46C21D8/0205C21D1/78C21D1/18C21D1/26C21D2211/008C21D2211/001C21D2211/002C21D6/001C21D8/0226C21D8/0263C21D1/60C21D8/0273C21D6/005C21D6/008C22C38/06
Inventor 洪淳泽
Owner POHANG IRON & STEEL CO LTD
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