A high-performance corrosion-resistant mobile pressure vessel steel plate and its manufacturing method

Abstract

The invention relates to the technical field of alloy steel manufacturing and in particular relates to a steel plate for a high-performance and corrosion-resisting movable pressure container and a manufacturing method thereof. The steel plate is prepared from the following chemical components in percentage by mass: 0.12 to 0.18 percent of C, 0.10 to 0.60 percent of Si, 1.10 to 1.74 percent of Mn,less than or equal to 0.013 percent of P, less than or equal to 0.004 percent of S, 0.10 to 0.30 percent of Ni, 0.032 to 0.055 percent of V, less than or equal to 0.06 percent of Nb, 0.008 to 0.020 percent of Ti, 0.009 to 0.025 percent of N and the balance of Fe and unavoidable impurities, wherein the content of the components meets the following relations: Ti / N is less than or equal to 4.0, and the sum of the Nb, the V and the Ti is less than or equal to 0.11 percent; the yield strength of the steel plate is greater than or equal to 430MPa, the tensile strength is 600 to 720MPa, the elongation percentage is greater than or equal to 20 percent and the transverse-50 DEG C KV2 of the steel plate is greater than or equal to 60J; meanwhile, the steel plate has relatively high corrosion performance and is especially suitable for manufacturing movable pressure containers with relatively high requirements.

Description

technical field [0001] The invention relates to the technical field of alloy steel manufacturing, in particular to a steel plate for a high-performance corrosion-resistant mobile pressure vessel and a manufacturing method thereof. Background technique [0002] With the rapid development of my country's economy, the acceleration of industrialization and urbanization, and the rapid development and advancement of petrochemical, gas and energy industries, mobile pressure vessels are used in liquid (or gas-liquid) fuels and chemical industries due to their flexibility and convenience. It plays an important and irreplaceable role in the transportation of raw materials. [0003] Mobile pressure vessels are divided into car tankers, railway tankers and tank containers. The medium for storage and transportation of mobile pressure vessels is liquefied gas, cryogenic liquid and permanent gas, such as liquefied petroleum gas, ethylene oxide, liquid oxygen, liquid ammonia, liquid carbon ...

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Problems solved by technology

[0005] The patent document with the publication number CN107099746A discloses a high-strength low-alloy steel plate for normalizing pressure vessels and its production method, but its yield strength is only ≥ 415 MPa, and its tensile strength is only 550-690 MPa. Impact properties and corrosion resistance, without specifying the microstructure of the steel

[0006] The patent document with the publication number CN106756525A discloses steel plates for liquefied petroleum gas tank cars and their preparation methods, but it only provides impact performance at -20°C, does not mention corrosion resistance, and does not explain the microstructure of the steel

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