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Pressure container steel having high toughness at -120 DEG C, and its production method

A pressure vessel, high toughness technology, applied in low temperature pressure vessel steel and its production, pressure vessel steel and its production field, can solve the problems of high production cost and so on

Inactive Publication Date: 2015-03-25
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nickel content in this literature is still high, that is, 7.5~10.0%, and the production cost is high

Method used

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  • Pressure container steel having high toughness at -120 DEG C, and its production method
  • Pressure container steel having high toughness at -120 DEG C, and its production method
  • Pressure container steel having high toughness at -120 DEG C, and its production method

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Embodiment Construction

[0051] The present invention is described in detail below:

[0052] Table 1 is the value list of each embodiment of the present invention and comparative examples;

[0053] Table 2 is the main process parameter list of each embodiment of the present invention and comparative example;

[0054] Table 3 is the heat treatment list of the embodiment of the present invention and comparative steel grade;

[0055] Table 4 is the mechanical inspection result of the embodiment of the present invention and comparative steel type;

[0056] Table 5 shows the test results of the hydrogen sulfide corrosion resistance of the examples of the present invention and the comparative steel grades.

[0057] Each embodiment of the present invention is produced according to the following steps:

[0058] Its steps:

[0059] 1) Smelting and continuous casting into billets: Carry out Ca treatment in the LF furnace, control the Ca in the molten steel within the target; control the RH vacuum treatment ...

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Abstract

A pressure container steel having a high toughness at -120DEG C comprises 0.06% or less of C, 0.05% or less of Si, 0.40-0.80% of Mn, 0.008% or less of P, 0.003% or less of S, 0.015-0.050% of Alt, 3.00-3.80% of Ni, 0.10-0.30% of Cu, 0.008-0.025% of Ti, and 0.004% or less of N, and also comprises one or above two of 0.50% or less of Cr, 0.50% or less of Mo, 0.040% or less of Nb, and 0.005% or less of Ca. A method for producing the pressure container steel comprises the following steps: carrying out smelting and continuous casting to form a casting blank; heating the casting blank; carrying out first-stage rough rolling; carrying out primary temperature control, and then carrying out second-stage rough rolling; carrying out secondary temperature control, and then carrying out fine rolling; and carrying out heat treatment according to the thickness of a steel plate for later use. The pressure container steel has a KV2 of 100J or more at -120DEG C, a transverse crack thickness rate (CTR) of 3% or less, a transverse crack length rate (CLR) of 10% or less, a transverse crack sensitivity rate (CSR) of 1.5% or less, a low Ni content and an excellent welding performance.

Description

technical field [0001] The invention relates to an alloy steel for containers and a production method thereof, specifically belongs to a low-temperature pressure vessel steel and a production method thereof, and further relates to a pressure vessel steel suitable for -120°C and a production method thereof. Background technique [0002] Before the present invention was proposed, although there were some research works on Ni-based low-temperature steels, the way of thinking was that the content of Ni added would increase as the temperature decreased, which resulted in high production costs. For example, after searching, the Japanese patent document JP60059032 discloses "a high-nickel steel plate with excellent low-temperature toughness and low yield ratio and its manufacturing method", and its composition mass percentage is C≤0.03, Si: 0.02~0.22, Mn: 0.05~ 0.47, P≤0.005, S≤0.005, Ni: 7.5~12.0, Al: 0.01~0.10, if necessary, one or more elements such as C, Mn or Nb (0.005~0.03) o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/50C22C38/16C21D8/02
Inventor 刘文斌李书瑞董汉雄丁庆丰邹德辉王宪军郭斌习天辉洪霞
Owner 武汉钢铁有限公司
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