Seawater corrosion-resistant steel plate with high crack arrest and anti-strain aging embrittlement properties and manufacturing method thereof
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A technology of anti-strain aging and seawater resistance, which is applied in the field of seawater corrosion-resistant steel plates, and can solve problems that do not involve the anti-strain aging embrittlement characteristics of steel plates, seawater corrosion resistance, and difficulty in guaranteeing low-temperature toughness.
Active Publication Date: 2020-08-25
BAOSHAN IRON & STEEL CO LTD
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[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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[0073] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0074] Refer to Table 1 for the composition of the steel in the embodiment of the present invention, Table 2 to Table 4 show the manufacturing process of the steel in the embodiment of the present invention, and Table 5 and Table 6 show the properties of the steel plate in the embodiment of the present invention.
[0075] Depend on figure 1 It can be seen that the microstructure of the steel plate is uniform and fine ferrite + dispersed bainite, and the average grain size of the microstructure is below 10 μm.
[0076] The steel plate of the present invention is designed through combination of components and combined with the TMCP+T manufacturing process, not only can produce TMCP steel plate with excellent comprehensive performance at a low cost, but also greatly shorten the manufacturing cycle of the steel plate, creating huge value for the enterprise ...
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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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