Seawater corrosion resistant steel plate with high crack arrest and strain aging embrittlement resistance characteristics and manufacturing method thereof

Abstract

The invention discloses a seawater corrosion resistant steel plate with high crack arrest and strain aging embrittlement resistance characteristics and a manufacturing method thereof. The seawater corrosion resistant steel plate is prepared from the compositions in percentage by weight: 0.040-0.070% of C, less than or equal to 0.15% of Si, 0.85-1.15% of Mn, less than or equal to 0.013% of P, lessthan or equal to 0.0030% of S, 0.90-1.20% of Cu, 0.60-1.00% of Ni, 0.05-0.30% of Mo, 0.010-0.030% of Nb, 0.008-0.014% of Ti, 0.040-0.070% of Al, less than or equal to 0.0050% of N, less than or equalto 0.0003% of B, 0.0010-0.0040% of Ca and the balance of Fe and inevitable impurities. The steel plate has high strength, excellent low-temperature toughness, the crack arresting characteristic and the strain aging embrittlement resistance characteristic, further has excellent seawater corrosion resistance, can withstand large heat input welding, is particularly suitable for icebreaker shells, offshore platforms, sea-crossing bridges, ocean wind tower structures, hydroelectric metal structures (pressure steel pipes, volutes, steel bifurcated pipes and hydraulic turbine metal components), pressure vessels and the like in ice sea areas, and can achieve stable mass industrial production.

Description

technical field [0001] The present invention relates to a seawater corrosion-resistant steel plate, in particular to a seawater corrosion-resistant steel plate with high crack arrest and anti-strain aging embrittlement properties and a manufacturing method thereof. Seawater corrosion-resistant steel plates with specific impact energy (single value) ≥ 100J and NDT (non-plastic transition temperature) ≤ -80°C can realize high heat input welding and ultra-low-cost manufacturing of steel components. 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 on its chemical composition and the process system of...

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Problems solved by technology

[0006] Chinese patent application numbers 201410300713.X, 201310244712.3, ZL201310244706.8, ZL201310124065.2, ZL201310244713.8, and ZL201210209637.2 disclose that various low-temperature steel plates can be welded with large heat input. It is inevitable to add a certain amount of precious alloying elements Cu and Ni, and it is difficult to guarantee the low-temperature toughness of the heat-affected zone (HAZ) of the steel plate with large heat input welding, and it does not involve the steel plate's anti-strain aging embrittlement characteristics and seawater corrosion resistance.

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