Corrosion-resistant low alloy steel plate for marine splash zones and production method thereof

Abstract

The invention discloses a corrosion-resistant low alloy steel plate for marine splash zones and a production method thereof. The corrosion-resistant low alloy steel plate comprises the following chemical components in percentage by weight: 0.04-0.07% of C, 0.10-0.30% of Si, 1.60-1.80% of Mn, at most 0.010% of P, at most 0.0080% of S, 0.030-0.050% of Nb, 0.020-0.060% of V, 0.006-0.015% of Ti, 0.90-1.30% of Ni, 0.30-0.60% of Cr, 0.20-0.40% of Cr, 0.40-0.60% of Mo and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps: smelting in a vacuum induction furnace, carrying out rolling-controlled cooling-controlled TMCP (thermomechanical rolling process), and carrying out low-temperature tempering heat treatment at 180-250 DEG C. The steel plate disclosed by the invention has the characteristics of favorable conventional mechanical properties (equivalent to Q500E level), strong corrosion resistance, stable production technique, strong operability and the like, and has mass production conditions.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and relates to a corrosion-resistant steel material, in particular to a corrosion-resistant low-alloy steel with an ocean splash zone and a production method thereof. Background technique [0002] According to the difference in the corrosion of steel materials in different locations in the ocean, the marine environment can be divided into five zones: the marine atmosphere zone, the seawater splash zone, the tidal range zone, the total immersion zone, and the submarine mud zone. In these five zones, the corrosion behavior is different, but the splash zone is the zone where the steel facilities are most severely corroded in the marine environment. People have done a lot of research on the corrosion of various zones in the marine environment, and have taken a series of preventive measures, such as coating protection and cathodic protection, and have also achieved many research results. Howe...

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Problems solved by technology

[0004] In order to overcome the problem of poor corrosion resistance of the ocean splash zone existing in the prior art, the object of the present invention is to provide a corrosion-resistant low-alloy steel plate for the ocean splash zone and its production method, the corrosion resistance of the steel plate is better than that of the existing Other steel grades used in the splash zone, with excellent seawater corrosion resistance in the marine splash zone

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