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Manufacturing method of corrosion-proof steel plate used for crude oil tanker cargo oil hold inner bottom plate and steel plate

A crude oil tanker, corrosion-resistant steel plate technology, applied in the direction of process efficiency improvement, etc., can solve the problems of inner bottom plate pitting, cumbersome operating procedures, reduce the overall corrosion rate of the cabin, etc., to prevent intrusion, inhibit pitting corrosion, excellent anti-corrosion Effect of local corrosion ability

Active Publication Date: 2015-01-21
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

[0041] Example 1: The chemical composition of the test steel plate in terms of mass percentage is: C: 0.12%, Si: 0.23%, Mn: 1.1%, P: 0.010%, S: 0.002%, Cu: 0.1%, Ni: 0.1%, W: 0.05%, Zr: 0.01%, Ti: 0.015%, Als: 0.047%, Sn: 0.03%, Ce: 0.0014%, Mg: 0.002%, and the balance is Fe and unavoidable impurities. In the steel plate (Cu+Ni+W) / C=2.1, Mn / (S+Ca+Mg+Sr)=275. The main manufacturing process steps and parameters are as follows: the thickness of the test steel plate is 18mm, the slab is in the furnace for 256min, the residual oxygen volume content is 8%, the descaling pressure is 22MPa, the final rolling temperature is 835℃, and the average reduction rate of the first 7 passes is 9.8% , the starting cooling temperature is 800°C, the final cooling temperature is 600°C, and the ACC cooling rate is 13°C / s. After the ACC water cooling, the steel plate is air-cooled, and the cooling rate is about 0.9°C / s.

Embodiment 2

[0042] Example 2: The chemical composition of the test steel plate in terms of mass percentage is: C: 0.05%, Si: 0.28%, Mn: 1.05%, P: 0.005%, S: 0.0019%, Cu: 0.3%, Ni: 0.3%, W: 0.08%, Zr: 0.009%, Ti: 0.02%, Als: 0.026%, Mo: 0.2%, Sr: 0.001%, Ca: 0.002%, Nb: 0.04%, the balance is Fe and unavoidable impurities, In the steel plate (Cu+Ni+W) / C=13.6, Mn / (S+Ca+Mg+Sr)=214. The main manufacturing process steps and parameters are as follows: test steel plate thickness specification 25mm, slab furnace time 290min, residual oxygen volume content 8%, primary descaling pressure 21MPa, final rolling temperature 790°C, average reduction rate of the first 7 passes 12.3% , the starting cooling temperature is 770°C, the final cooling temperature is 600°C, and the ACC cooling rate is 14°C / s. After the ACC water cooling is completed, the steel plate is air-cooled, and the cooling rate is about 0.98°C / s.

[0043] The mechanical properties and average size of sulfides of the test steel plate produ...

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Abstract

The invention discloses a manufacturing method of a corrosion-proof steel plate used for a crude oil tanker cargo oil hold inner bottom plate and the steel plate, and belongs to the technical field of steels used for hot rolling flat-plate boat body structures. The method of manufacturing the corrosion-proof steel plate comprises the following steps of: heating a slab; descaling the slab; rolling; cooling by ACC (activated calcium carbonate) water; cooling by air; controlling parameters. The steel plate disclosed by the invention comprises the following chemical compositions in percentage by mass: 0.02-0.25% of C, 0.05-0.5% of Si, 0.1-2.0% of Mn, at most 0.025% of P, at most 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-proof steel plate disclosed by the invention has the advantages that the steel plate can be directly used for construction of the tanker cargo oil hold lower bottom plate in a bare state, has an excellent local corrosion resistance capability under the service conditions of a high concentration of Cl<-> and a low pH value, coating protection is not needed, the maintenance cost is reduced, and the service life of a hold body is 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 method for manufacturing a corrosion-resistant steel plate for an inner bottom plate of a cargo oil tank of a crude oil tanker and the steel plate. 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 general...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C22C38/16C22C38/58C22C38/54C22C38/50
CPCY02P10/20
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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