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Corrosion-resistant steel for bottom board in cargo oil compartment of crude oil tanker

A technology of corrosion-resistant steel and cargo oil tank, which is applied in the field of corrosion-resistant steel for the inner bottom plate of the cargo oil tank of crude oil tankers, can solve the problems of reducing the overall corrosion rate of the tank body, pitting corrosion of the inner bottom plate, and complicated operation procedures, and achieves excellent anti-corrosion properties. Local corrosion ability, intrusion prevention, pitting inhibition effect

Inactive Publication Date: 2013-09-18
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of corrosion inhibitors will significantly reduce the overall corrosion rate of the tank, but the operating procedures are cumbersome, and the cost of protection is several times that of coatings, so it is not suitable for extensive use in tanks of oil tankers
Neither of the two protection methods can fundamentally solve the pitting corrosion problem of the inner bottom plate during the service period of the oil tanker

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: The chemical composition of the test steel is: C: 0.12wt%, Si: 0.23wt%, Mn: 1.1wt%, P: 0.010wt%, S: 0.002wt%, Cu: 0.1wt%, Ni: 0.1wt% %, W: 0.05wt%, Zr: 0.01wt%, Ti: 0.015wt%, Als: 0.047wt%, Sn: 0.03wt%, Ce: 0.0014wt%, Mg: 0.002wt%, the balance is Fe and not Avoid impurities. In steel (Cu+Ni+W) / C=2.1, Mn / (S+Ca+Mg+Sr)=275.

Embodiment 2

[0036] Example 2: The chemical composition of the test steel is: C: 0.05wt%, Si: 0.28wt%, Mn: 1.05wt%, P: 0.005wt%, S: 0.0019wt%, Cu: 0.3wt%, Ni: 0.3wt% %, W: 0.08wt%, Zr: 0.009wt%, Ti: 0.02wt%, Als: 0.026wt%, Mo: 0.2wt%, Sr: 0.001wt%, Ca: 0.002wt%, also contains Nb: 0.04wt% %, the balance is Fe and unavoidable impurities, in steel (Cu+Ni+W) / C=13.6, Mn / (S+Ca+ Mg + Sr )=214.

[0037] The test steel with the above composition is smelted in an industrial converter, heated by a continuous casting slab, and rolled by a rolling mill to produce thick steel plates with different thickness specifications. Its mechanical properties and average size of sulfide are as follows:

[0038] The thickness specification of the test steel in the comparative example is 18mm, the yield strength is 340MPa, the tensile strength is 470MPa, the elongation after fracture is 25%, and the transverse impact energy absorbed at -20°C is 148J; the average size of sulfide is 4.5μm.

[0039] Example 1 The thi...

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Abstract

The invention relates to corrosion-resistant steel for a bottom board in a cargo oil compartment of a crude oil tanker, belonging to the field of steel for hot-rolled slab ship structure. The corrosion-resistant steel comprises the chemical components by mass percentage: 0.02-0.25% of C, 0.05-0.5% of Si, 0.1-2.0% of Mn, less than or equal to 0.025% of P, less than or equal to 0.01% of S, 0.05-2% of Cu, 0.05-2% of Ni, 0.001-1% of W, 0.001-0.1% of Zr, 0.005-0.1% of Ti, 0.020-0.1% of Als, and the balance of Fe and inevitable impurities. The corrosion-resistant steel has the advantages that the corrosion-resistant steel can be directly used for building the bottom board in the cargo oil compartment of the oil tanker in a naked-state manner, has excellent local corrosion resistance capability under the service conditions of high Cl<-> concentration and lower pH value, is not required for coating protection, the maintenance cost can be lowered, and the service life of the compartment body can be effectively prolonged.

Description

technical field [0001] The invention belongs to the technical field of steel for hot-rolled flat hull structures, and in particular relates to a corrosion-resistant steel for the inner bottom plate of a cargo oil tank of a crude oil tanker. Suitable for general strength and high strength ship plates. Background technique [0002] In recent years, oil spill accidents have occurred frequently during the operation of oil tankers at sea, causing huge economic losses and serious pollution to the marine environment. In addition, shipping companies also urgently need to reduce the cost of inspection and maintenance of oil tankers. Therefore, the corrosion of oil tankers has been greatly affected More and more attention. The main cause of the accident was the corrosion and perforation of the inner bottom plate of the cargo oil tank. The cargo oil tank is the main container for carrying crude oil on an oil tanker. The steel generally used for the cargo oil tank is A32-E36 grade thic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C22C38/58C22C38/50
Inventor 杨建炜曹建平许静章军王全礼麻庆申狄国标
Owner SHOUGANG CORPORATION
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