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Corrosion-resistant steel for upper deck and bottom plate of crude oil tanker and crude oil tanker

A crude oil tanker, corrosion-resistant technology, applied in the field of crude oil tanks, can solve problems such as inspection and coating cost, expansion of coating area, oil coating detachment, etc., and achieve the effect of inhibiting general corrosion

Active Publication Date: 2022-02-25
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] (2) Detachment of the oil coating due to excessive cleaning,
However, the coating work of crude oil tanks not only enlarges the coating area, but also requires repainting every 10 years due to the deterioration of the coating film, so inspection and painting cost a lot of money

Method used

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  • Corrosion-resistant steel for upper deck and bottom plate of crude oil tanker and crude oil tanker
  • Corrosion-resistant steel for upper deck and bottom plate of crude oil tanker and crude oil tanker
  • Corrosion-resistant steel for upper deck and bottom plate of crude oil tanker and crude oil tanker

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Effect test

Embodiment 1

[0135] Molten steel having the composition shown in Table 1 (the remainder being Fe and unavoidable impurities) was melted and continuously cast by a generally known method to produce a slab. After the slab was heated under the conditions shown in Table 2, it was hot-rolled under the conditions shown in Table 2 to make a hot-rolled steel sheet with a thickness of 40 mm, and was heated by water cooling under the conditions shown in Table 2. Cool to a cooling stop temperature of 450°C. It should be noted that in the heating atmosphere for heating the slab, oxygen is defined as the volume % described in Table 2, and gases other than oxygen are expressed as CO in volume %. 2 : 13%, CH 2 O: 14%, N 2 :margin.

[0136] Next, with respect to the obtained steel material, after removing the oxide film called the black scale on the surface, a test piece having the size described later was taken, and the measurement of the amount of solid solution Cu in the surface layer portion of the...

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Abstract

The present invention provides a corrosion-resistant steel material for the upper deck and the bottom plate of a crude oil tanker, which can be used in both the upper deck and the bottom plate of the crude oil tanker, and has both excellent general corrosion resistance and local corrosion resistance. With a predetermined component composition, the amount of solid-solution Cu in the surface layer portion of the steel material is 0.40% by mass or less, and the relationship of the following formula (1) is satisfied. 〔%Solution Cu〕 / 〔%Cu〕≥0.35‑‑‑(1).

Description

technical field [0001] The present invention relates to a crude oil tank of a crude oil tanker, in particular to a corrosion-resistant steel material for the upper deck and bottom plate of a crude oil tanker suitable for the top and side wall of a crude oil tank where general corrosion occurs, and the bottom of a crude oil tank where pitting corrosion occurs. Moreover, this invention relates to the crude oil tanker which consists of said steel materials. [0002] In addition, the corrosion-resistant steel materials for the upper deck and bottom plate of the crude oil tanker of the present invention include thick steel plates, thin steel plates and shaped steels. Background technique [0003] It is known that general corrosion occurs on the inner surface of crude oil tanks used in crude oil tankers, especially on the back of the upper deck and steel materials at the upper part of the side walls. The causes of this general corrosion include [0004] (1) Repeated dew condensa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C22C38/60C21D8/02
CPCC21D8/02C22C38/00C22C38/60C22C38/04C22C38/02C22C38/08C22C38/16
Inventor 寒泽至塩谷和彦橘俊一池田博司伊木聪
Owner JFE STEEL CORP
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