Longitudinal variable-thickness steel plate for upper deck of crude oil cargo oil tank and production method of longitudinal variable-thickness steel plate

Abstract

The invention relates to a longitudinal variable-thickness steel plate for an upper deck of a crude oil cargo oil tank, which is characterized by comprising the following chemical components: 0.020%-0.080% of C, 0.10%-0.50% of Si, 0.90%-1.50% of Mn, 0.015%-0.045% of Nb, 0.020%-0.060% of V, 0.005%-0.018% of Ti, 0.18%-0.34% of Cu, 0.10%-0.33% of Ni, 0.08%-0.19% of Cr, 0.15%-0.25% of Sn, 0.06%-0.20% of Sb, 0.0120%-0.0160% of N, 0.008%-0.015% of P, less than or equal to 0.005% of S, 0.015%-0.030% of Als and the balance of Fe and inevitable impurities. The steel plate has excellent mechanical properties and corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of metal material production, in particular to a longitudinally variable-thickness steel plate for the upper deck of a crude oil cargo oil tank and a production method thereof. Background technique [0002] In recent years, my country's crude oil consumption and imports have been increasing year by year, and it is the second largest oil consumer in the world. However, my country's dependence on foreign crude oil is high, exceeding 65%. Therefore, the safety of crude oil transportation is very important to my country's energy strategy. Import More than 90% of crude oil is transported by VLCC, because crude oil contains such as H 2 S, Cl - Such corrosive media will cause corrosion to oil tankers, oil storage tanks, etc., which is the biggest safety hazard in the process of crude oil storage and transportation. In view of the operational safety of oil tankers, the International Maritime Organization (IMO) has ...

AI Technical Summary

Problems solved by technology

[0006] 1) The alloying elements are high, the production cost is high, and the performance of the steel plate is deteriorated

[0007] 2) The strength and toughness of the steel plate are low, which cannot meet the requirements of use

[0008] 2) The steel plate is of equal thickness, which is unfavorable to the optimization of the hull structure

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