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Steel materials for crude oil tanks and crude oil tanks with excellent corrosion resistance

A technology for corrosion resistance and crude oil tanks, which is applied in the field of steel for crude oil tanks and crude oil tanks with excellent corrosion resistance, and can solve the problems of large coating area, huge inspection costs, and promotion of corrosion

Active Publication Date: 2020-12-04
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating work of crude oil tanks not only requires a large coating area, but also requires recoating every 10 years due to the deterioration of the coating film. Therefore, huge costs are incurred in inspection and coating.
Furthermore, it is pointed out that the damaged part of the repainted coating film will actually promote corrosion in the corrosive environment of crude oil tanks

Method used

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  • Steel materials for crude oil tanks and crude oil tanks with excellent corrosion resistance
  • Steel materials for crude oil tanks and crude oil tanks with excellent corrosion resistance
  • Steel materials for crude oil tanks and crude oil tanks with excellent corrosion resistance

Examples

Experimental program
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Effect test

Embodiment

[0141]The steels with various compositions shown in Table 3 No. 1 to 37 are melted in a vacuum melting furnace to make steel ingots, or melted in a converter and made into billets by continuous casting, and they are reheated to 1150°C After that, hot rolling was performed at the finishing temperature shown in Table 4 to form a thick steel plate with a thickness of 25 mm, and then cooled to the cooling stop temperature shown in Table 4 at a water cooling rate of 10° C. / s.

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Abstract

By making the composition of the steel material contain C: 0.03-0.18%, Si: 0.03-1.50%, Mn: 0.1-2.0%, P: 0.025% or less, S: 0.010% or less, Al: 0.015-0.049% by mass % %, N: 0.008% or less, W: 0.005 to 0.5%, and Nd: 0.0001 to 0.010%, the remainder is composed of Fe and unavoidable impurities, and the dislocation density α of the steel satisfies the following formula (1) Steel materials for crude oil tanks that are excellent in both the overall corrosion resistance of the top plate of crude oil tanks such as oil tanks in oil tankers and the localized corrosion resistance of the bottom plates of crude oil tanks. α( / m 2 )≤{10 20 ×[%W]×[%Nd]} / (5×[%Al]−0.01)...(1), where [%M] is the content (mass %) of the M element in the steel material.

Description

technical field [0001] The present invention relates to an oil tank of a crude oil tanker formed by welding steel materials, and a tank for transporting or storing crude oil (hereinafter collectively referred to as "crude tank"). Steel materials for crude oil tanks that can prevent full surface corrosion at the bottom of the crude oil tank and localized corrosion at the bottom of the crude oil tank, and crude oil tanks made of the steel. [0002] It should be noted that the steel material for crude oil tanks of the present invention includes thick steel plates, thin steel plates and section steels. Background technique [0003] It is known that steel materials used on the inner surface of crude oil tanks of oil tankers, especially the back of the upper deck and the upper part of the side walls, are corroded over the entire surface. The following reasons etc. are mentioned as a cause which causes this whole surface corrosion. [0004] (1) Repeated occurrences of dew condens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C22C38/02C22C38/04C22C38/06B65D90/02B65D90/22C22C38/12C22C38/60C21D8/02
CPCB65D90/02B65D90/22C21D8/02C22C38/00C22C38/12C22C38/60C22C38/001C22C38/02C22C38/04C22C38/06
Inventor 钓之郎村濑正次
Owner JFE STEEL CORP
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