Steel plate for seamless high pressure gas cylinder, and manufacture method thereof

Abstract

The invention provides a steel plate for a seamless high pressure gas cylinder. The steel plate is characterized by comprising the following components, by weight, 0.28- 0.40% of C, 0.20-0.40% of Si, 0.50-1.50% of Mn, 0.010% or less of S, 0.015% or less of P, 1.20% or less of C, 0.50% or less of Mo, 0.10-0.50% of Ni, 0.010-0.030% of Ti, 0.050% or less of Al, and the balance of iron (Fe) and other inevitable impurities. The invention further provides a manufacture method for the steel plate. The method comprises processes of smelting, hot rolling, reeling, holding, quenching and tempering. According to the present invention, after quenched-tempered heat treatment, yielding strength of the steel plate is higher than 990 MPa and tensile strength of the steel plate exceeds 1100 MPa, and impact energy of the steel plate is over 40J / cm<2> at a temperature of -50 DEG C, such that the steel plate can be used for manufacturing various compressed gas steel cylinders, particularly high pressure gas cylinders.

Description

technical field [0001] The invention relates to iron and steel materials, in particular to a steel plate for high-pressure seamless gas cylinders and a manufacturing method thereof. Background technique [0002] The production of traditional seamless gas cylinders is realized through processes such as billet perforation and drawing. The seamless gas cylinders made of steel billets have the disadvantages of too thick walls of the steel cylinders, heavy weight of the steel cylinders, and low loading efficiency. The steel used for traditional gas cylinders is generally low-carbon steel, which is treated by normalizing, and its strength is generally only about 500MPa, and the normalizing strength of low-carbon micro-alloy steel is only about 600MPa. The strength of the steel cylinder determines the pressure bearing capacity, usually the inflation pressure does not exceed 150kgf / cm 2 , for vehicle-mounted gas cylinders, because the inflation pressure is low and the amount of inf...

AI Technical Summary

Problems solved by technology

[0003] Traditional gas cylinders are usually made of steel billets through stamping, drawing and other processes. The disadvantages are obvious. For example, the wall thickness of the steel cylinder, especially the thick bottom of the steel cylinder, makes the weight of the steel cylinder itself large. It is not conducive to energy saving, and the surface quality of steel cylinders manufactured by stamping is poor, requiring multiple surface treatment processes, and the production efficiency is low

When the traditional steel cylinder is used in the normalizing state, the strength of low carbon steel generally does not exceed 500MPa, and the strength of low carbon microalloy steel is only about 600MPa, because the low strength limits the inflation pressure

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