Method for manufacturing anticorrosion steel plate for upper deck on crude oil tanker oil cargo tank and steel plate

A technology for crude oil tankers and cargo oil tanks, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., to achieve the effect of prolonging the service life, reducing the uniform corrosion rate, and reducing the number of hull inspections and maintenance

Active Publication Date: 2013-09-11
SHOUGANG CORPORATION
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a method for manufacturing a corrosion-resistant steel plate for the upper deck of the cargo oil tank of a crude oil tanker and the steel plate, which solves the problem of uniform corrosion of the upper deck in the corrosive environment of the cargo oil tank

Method used

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Examples

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Embodiment Construction

[0037] The chemical composition of the test steel plate of the comparative example is: C: 0.14%, Si: 0.28%, Mn: 1.33%, P: 0.015%, S: 0.005%, Cr: 0.15%, Als: 0.035%, and the balance It is Fe and unavoidable impurities. The main manufacturing process steps and parameters are as follows: test steel plate thickness specification 18mm, slab furnace time 240min, residual oxygen volume content 10%, primary descaling pressure 19MPa, final rolling temperature 910℃, average reduction rate of the first 7 passes 9.8% , the starting cooling temperature is 870°C, the final cooling temperature is 700°C, the ACC cooling rate is 5°C / s, and the ACC is cooled by air after water cooling.

[0038] EXAMPLES The chemical composition of the test steel plate in terms of mass percentage is: C: 0.05%, Si: 0.25%, Mn: 1.1%, P: 0.005%, S: 0.0008%, Cu: 0.15%, Ni: 0.1%, Cr: 0.10%, W: 0.08%, Nb: 0.04%, Zr: 0.009%, N: 0.006%, Hf: 0.001%, Sr: 0.001%, Ca: 0.002%, Ti: 0.02%, Als: 0.026%, balance It is Fe and un...

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Abstract

The invention discloses a method for manufacturing an anticorrosion steel plate for an upper deck on a crude oil tanker oil cargo tank and the steel plate and belongs to the technical field of steel for a hot-rolling slab ship structure. The steel plate is manufactured through the processes of plate blank heating, plate blanking scale removing, rolling, ACC water cooling and air cooling. The steel plate comprises the following chemical composition, by weight, 0.02%-0.25% of C, 0.05%-0.5% of Si, 0.1%-2.0% of Mn, <=0.025% of P, <=0.01% of S, 0.05%-2% of Cu, 0.05%-2% of Ni, 0.01%-5% of Cr, 0.001%-1% of W, 0.001%-0.1% of Zr, 0.0002%-0.01% of Ca, 0.005%-0.1% of Ti, 0.001%-0.008% of N, 0.020%-0.1% of Als, and the balance Fe and unavoidable impurities. The steel plate has the advantages of being capable of being used directly at an exposed state and obviously reducing the uniform corrosion rate on the upper deck, free of the requirements for coating protection and capable of prolonging service life.

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 method for manufacturing a corrosion-resistant steel plate for the upper deck of a cargo oil tank of a crude oil tanker and the steel plate, which is suitable for general-strength and high-strength ship plates. Background technique [0002] The cargo oil tank is the main container for carrying crude oil on an oil tanker, and its steel generally uses thick plates of A32-E36 grade, and the specifications are mostly between 20-50mm. With the exploitation of offshore oil and deep formation oil, 80% of the crude oil is highly corrosive crude oil such as high sulfur and high acid. The internal corrosion environment of the crude oil tank of the tanker is complex and unique. The tank is mainly crude oil and a small amount of H 2 O, also contains O 2 , CO 2 , SO 2 , N 2 Such as explosion-proof inert gas, and H volatilized from crude oil ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22B21B45/04B21B45/02C22C38/58C22C38/50
Inventor 杨建炜许静曹建平章军王全礼麻庆申狄国标
Owner SHOUGANG CORPORATION
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