High-capacity high-pressure gas cylinder steel and production method thereof

Abstract

The invention belongs to the field of iron and steel production, and in particular relates to large capacity high pressure gas cylinder steel and a production method thereof. The invention aims at solving the technical problems of providing the large capacity high pressure gas cylinder steel and improving the quality and comprehensive mechanical properties of the large capacity high pressure gas cylinder steel. The large capacity high pressure gas cylinder steel provided by the invention comprises the following components in percentage by weight: 0.33-0.38 percent of carbon, 0.15-0.35 percentof silicon, 0.80-0.90 percent of manganese, 1.05-1.2 percent of chromium, 0.20-0.30 percent of molybdenum, 0.02-0.04 percent of aluminum, not more than 0.010 percent of phosphorus, not more than 0.008 percent of sulfur, not more than 0.015 percent of phosphorus and sulfur, not more than 0.2 percent of nickel, not more than 0.15 percent of copper, not more than 0.015 percent of stannum, not more than 0.015 percent of arsenic, not more than 0.0002 percent of hydrogen, not more than 0.007 percent of nitrogen, not more than 0.0020 percent of T[0], and the balance of ferrum. Only through simple quenching and tempering heat treatment, good and stable comprehensive mechanical properties of the steel provided by the invention can be obtained so that the steel can be used for manufacturing large capacity steel cylinders.

Description

technical field [0001] The invention belongs to the field of steel production, and in particular relates to a large-capacity high-pressure gas cylinder steel and a production method thereof. Background technique [0002] With the rapid development of the economy, seamless gas cylinders are developing in the direction of high strength, high toughness, light weight and large capacity. Moreover, the service conditions of gas cylinders are harsh, with a reference working pressure of 20 MPa or above and a working temperature in the range of -50 to 80 °C. Frequent filling and movement of high-pressure gas requires higher safety. [0003] GB24160 "Compressed Natural Gas Cylinders for Vehicles with Steel Liner Circumferential Winding Glass Fiber Composite Materials" stipulates that CNG cylinders should be made of high-quality chrome-molybdenum steel. The chemical composition of the steel is: C≤0.37%, Si 0.15%-0.37%, Mn 0.40%-0.90%, Cr 0.80%-1.20%, Mo 0.15%-0.35%, P≤0.020%, S≤0.020%...

AI Technical Summary

Problems solved by technology

[0008] The 34CrMo4 steel produced by the existing technology has high strength, low plasticity and toughness, and low service life, which is difficult to meet the development needs of gas cylinders

Images