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A corrosion-resistant steel technology, applied in the field of corrosion-resistant steel for crude oil tankers, can solve the problems of electrolytic protection not working, corrosion, etc., and achieve the effect of excellent general corrosion resistance and local corrosion resistance
Active Publication Date: 2011-11-30
JFE STEEL CORP
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However, when the ballast tank is not filled with seawater, the electrolytic protection does not work at all, so it is severely corroded due to the action of residual attached saline metter
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[0106] Various steels having the compositions of Nos. 1 to 36 shown in Table 1 were melted in a vacuum melting furnace or a converter to produce steel ingots or steel slabs, and the obtained steel ingots or steel slabs were reheated to 1200° C., and then Hot rolling at a finishing temperature of 800° C. was performed to obtain a thick steel plate with a plate thickness of 16 mm. The steel plates of Nos. 1 to 36 obtained above were subjected to the following three kinds of corrosion resistance tests.
[0107] (1) Comprehensive corrosion test simulating the environment on the upper deck of an oil tanker
[0108] In order to evaluate the corrosion resistance to the general corrosion of the back of the upper deck of the oil tanker, cut rectangular pieces with a width of 25 mm x a length of 48 mm x a thickness of 4 mm from the thick steel plates of No. 1 to 36 above, and perform shot blasting (shot blasting) on the surface. ), so as to make a corrosion test piece in the bare sta...
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Abstract
Disclosed is a corrosion-resistant steel material for a tanker, which has excellent corrosion resistance in a corrosive environment produced in an oil tank in the tanker and also has excellent post-coating corrosion resistance in a corrosive environment produced in a ballast tank in the tanker. Specifically disclosed is a corrosion-resistant steel material for a crude oil tanker, which comprises (by mass%) 0.03 to 0.16% of C, 0.05 to 1.50% of Si, 0.1 to 2.0% of Mn, 0.025% or less of P, 0.01% or less of S, 0.005 to 0.10% of Al, 0.008% or less of N, more than 0.1% and not more than 0.5% of Cr, and 0.03 to 0.5% of Cu, and may additionally comprise, as an optional additive element, at least one element selected from W in an amount of 0.01 to 0.5%, Mo in an amount of 0.01 to 0.5%, Sn in an amount of 0.001 to 0.2%, Sb in an amount of 0.001 to 0.5%, Ni in an amount of 0.005 to 0.3% and Co in an amount of 0.005 to 0.3%, wherein Cu, W, Mo, Sn, Sb, Cr, Ni, Co, S and P are so contained as to meet a specific relationship.
Description
technical field [0001] The present invention relates to a corrosion-resistant steel material for a crude oil tanker used in different parts of a corrosion environment such as an oil tank and a ballast tank of a crude oil tanker steel product), in particular, relates to the ability to reduce the local corrosion (local corrosion) that occurs at the bottom plate (bottom plate) of the tank portion of the crude oil tanker and the general corrosion (top board) and side plate (side plate) that occur at the place ( general corrosion), and the corrosion-resistant steel for crude oil tankers that corrodes the painted surface of the ballast tank part on the back of the bottom plate of the tank part. Background technique [0002] It is known that inert gas (inert gas) (in O 2 : 5% by volume, CO 2 : 13% by volume, SO 2 : 0.01% by volume, balance N 2 O contained in the exhaust gas (exhaust gas) of the boiler (boiler) or engine (engine) etc.) representing the composition 2 , CO 2 , S...
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