High-performance marine climate resistant steel plate and manufacturing method thereof

Abstract

The invention relates to a high-performance marine climate resistant steel plate and a manufacturing method thereof. The high-performance marine climate resistant steel plate comprises the following components in percentage by weight: 0.040-0.080 percent of C, less than or equal to 0.30 percent of Si, 0.40-0.80 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.003 percent of S, 0.15-0.45 percent of Cu, 1.25-1.85 percent of Ni, 0.15-0.45 percent of Mo, 0.007-0.013 percent of Ti, 0.015-0.030 percent of Nb, 0.035-0.065 percent of Als, less than or equal to 0.0050 percent of N, 0.001-0.004 percent of Ca and the balance of Fe and inevitable impurities. According to the high-performance marine climate resistant steel plate and the manufacturing method thereof, a low-alloy weathering resistant steel system adopting ultralow C-low Mn-high Als-low N-(Cu and high Ni) alloying-Nb microalloying-ultramicro Ti treatment is used for controlling sea atmosphere corrosion resistant parameter Eta to be greater than or equal to 1.36, (%Ni)*(%Mo) to be greater than or equal to 0.27, Ceq to be less than or equal to 0.42 percent, Ca treatment and Ca / S to be 1.0-3.0 and Ca*S0.28 to be less than or equal to 1.0*10<-3>; the sea atmosphere corrosion resistant steel plate with excellent toughness, strong plasticity matching, low yield ratio, sea atmosphere corrosion resistant property and fatigue resistance is obtained by adopting TMCP, and the sea atmosphere corrosion resistant steel plate can be welded at high heat input.

Description

technical field [0001] The invention relates to low-carbon (high-strength) low-alloy steel and a manufacturing method thereof, in particular to a high-performance marine weather-resistant steel plate and a manufacturing method thereof. Ratio ≤0.80, Charpy transverse impact energy (single value) at -40°C ≥100J, can be welded with large heat input, Charpy impact energy (single value) at -40°C in the heat-affected zone of large heat input welding ≥100J, mainly used for Coating coastal bridges, offshore platforms, offshore wind tower structures, etc. Background technique [0002] As we all know, low-carbon (high-strength) low-alloy steel is one of the most important engineering structural materials, widely used in oil and gas pipelines, offshore platforms, shipbuilding, bridge structures, boiler pressure vessels, building structures, automobile industry, railway transportation and machinery under manufacture. The properties of low-carbon (high-strength) low-alloy steel depend ...

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Problems solved by technology

[0004] Chinese patent ZL200910048288.9 discloses "a high-performance weather-resistant building structure steel and its manufacturing method" and Chinese patent ZL200910196233.2 discloses "60 kg high-performance weather-resistant steel plate and its manufacturing method" are ordinary atmospheric corrosion-resistant steel , this kind of steel plate cannot withstand the erosion of chloride ions in the marine atmospheric environment

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