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Pressure vessel steel sheet having excellent pwht resistance, and manufacturing method therefor

A technology for pressure vessels and steel plates, which is applied in the field of pressure vessel steel plates and its manufacturing, and can solve the problems of steel plate tensile strength deterioration, steel plate tensile strength and impact toughness deterioration, etc.

Active Publication Date: 2019-08-02
浦项股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the steel sheet subjected to the long-time PWHT process may have a problem in that the tensile strength of the steel sheet may deteriorate due to the coarsening of the structure of the steel sheet
However, the steel plate subjected to the long-time PWHT process may have a problem in that the tensile strength and impact toughness of the steel plate may be deteriorated due to the coarsening of the structure of the steel plate

Method used

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  • Pressure vessel steel sheet having excellent pwht resistance, and manufacturing method therefor
  • Pressure vessel steel sheet having excellent pwht resistance, and manufacturing method therefor

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Embodiment approach

[0055] The slabs having the composition shown in Table 1 below were reheated for 300 minutes at 1140°C, and in the recrystallization zone (1100°C to 900°C) at a reduction rate of 10% to 15% per pass The hot-rolling process is completed in the process to obtain hot-rolled steel sheets. Thereafter, the hot-rolled steel plate was subjected to a normalizing heat treatment of 1.3×t+20 minutes at 890° C., cooled in the air, and the cooled steel sheet was subjected to a return temperature of 1.6×t+20 minutes at 650° C. Fire heat treatment to obtain pressure vessel steel plate.

[0056] The PWHT process was performed under the conditions for the pressure vessel listed in Table 2 below, the microstructure was analyzed, and yield strength, tensile strength, elongation, and low temperature impact toughness were measured and listed in Table 2. For all the examples in Table 2, the rest of the structure except tempered bainite is ferrite and pearlite, and the precipitate volume can refer t...

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Abstract

Disclosed are a pressure vessel steel sheet and a method for manufacturing the same, the steel sheet comprising: by wt%, 0.10-0.20% of C, 0.15-0.40% of Si, 1.15-1.50% of Mn, 0.45-0.60% of Mo, 0.03-0.30% of Cu, 0.025% or less of P, 0.025% or less of S and 0.005-0.06% of sol. Al; two or more selected from the group consisting of 0.03-0.30% of Cr, 0.002-0.025% of Nb and 0.002-0.025% of Zr; and the balance of Fe and inevitable impurities, wherein the structure comprises a mixture structure of ferrite, perlite and tempered bainite after post weld heat treatment (PWHT) for 60 hours at 600-660 DEG C,and the area fraction of the tempered bainite is at least 10% (excluding 100%).

Description

technical field [0001] The present disclosure relates to a pressure vessel steel plate having excellent PWHT resistance (PWHT resistance) and a manufacturing method thereof, and more particularly to a pressure vessel having excellent PWHT resistance which can be suitably used as a material for a heat recovery steam generator (HRSG) or the like Steel plate and its manufacturing method. Background technique [0002] According to the recent trend of actively developing oil fields in harsh environments due to the era of high oil prices and the recent shortage of oil supply, the thickness of steel containers for refining and storing crude oil has increased. [0003] In addition to the aforementioned steel thickening, post-weld heat treatment (PWHT) is performed to relieve stress generated during welding for the purpose of preventing deformation of structures when welding steel and stabilizing shape and size after welding. However, the steel sheet subjected to the long-time PWHT ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C21D8/02C21D1/28C22C38/04C22C38/02C21D9/50C22C38/20C22C38/00C22C38/38
CPCC21D1/28C21D8/02C21D9/50C22C38/00C22C38/02C22C38/04C22C38/20C22C38/22C22C38/26C22C38/38C21D6/005C21D6/008C21D8/0205C21D8/0226C21D8/0263C22C38/06C22C38/12C22C38/16C22C38/18C22C38/002C21D2211/002C21D2211/005C21D2211/009
Inventor 洪淳泽
Owner 浦项股份有限公司
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