Rare earth 34Mn2VRE-containing rolled square billet for gas cylinder and manufacturing method of square billet

Abstract

The invention discloses a rare earth 34Mn2VRE-containing rolled square billet for a gas cylinder. The square billet is prepared from the following components by weight percent: 0.30-0.37% of C, 0.17-0.37% of Si, 1.40-1.75% of Mn, less than or equal to 0.035% of P, less than or equal to 0.030% of S, less than or equal to 0.25% of Cr, less than or equal to 0.25% of Ni, less than or equal to 0.20% ofCu, 0.07-0.12% of V, 0.0010-0.0040% of RE, and 0.0015-0.0040% of Ca. The invention further discloses a manufacturing method of the square billet. According to the square billet and the manufacturingmethod of the square billet disclosed by the invention, the square billet, manufactured by explicitly optimizing the rare earth content, the calcium content and the matching ratio of rare earth to calcium, is excellent in product quality; operation and parameters of the manufacturing method are optimized, so that the method is simple and easy to control, the rare earth adding cost is reduced, theproduction efficiency is improved, and the energy consumption production cost is reduced; and in the manufacturing process, the cleanliness of molten steel is high, safety and environmental protectionare achieved, and thus the method is conducive to meeting the requirements of the development of the society.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a gas cylinder containing rare earth 34Mn 2 VRE rolled billet and method for its manufacture. Background technique [0002] Gas cylinder is a mobile steel cylinder that can be refilled with O2, H2, CO2 and other permanent gases or high-pressure liquefied gas. The working pressure is generally 15-30MPa. , medical, military and other sectors of the national economy. Gas cylinders are high-pressure containers, which are the largest number of special equipment in my country. With the development of gas industry and electronic industry, the gas cylinder industry is also developing rapidly, and the demand for gas cylinders is also increasing. There are two main methods for manufacturing seamless gas cylinders. One is the forging bottle method, which uses a square steel billet to be stretched and closed by hot stamping (extrusion); Closing and bottom molding. So fa...

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Problems solved by technology

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that the rare earth content, the calcium content and the matching of the rare earth and calcium are not clearly defined in the prior art; the material cost and the operation cost of the rare earth addition method are relatively high , the manufacturing is difficult to control precisely, and the product quality is not good; there is cleanliness of molten steel when rolling the cylinder billet, and trace residual elements bring adverse effects on subsequent operators and the environment

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