[Kovove materialy - Metallic materials]
    Mon - October 03, 2022 - 19:47 No. of hits : 1389468 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 39 (2001), Issue 5

Mechanical properties and microstructure of steel pipes for gas bottles
vol. 39 (2001), no. 5, pp. 349 - 357

In this paper mechanical and microstructural results of laboratory heat treatment (quenching and tempering) of seven various heats made of low-alloyed manganese steels are shown. The effect of vanadium and nitrogen contents on the yield/tensile strength ratio of pipes in quenched and tempered state was analysed. The linear relationship between the total amount of vanadium and nitrogen contents and the yield/tensile strength ratio was found. The obtained results are suitable for various heats of following chemical composition: 0.32-0.35 wt.% C, 1.13-1.37 wt.% Mn, 0.15-0.22 wt.% V, and 0.0070-0.0127 wt.% N. Quenching the pipes in oil from 850 °C, tempering them at 650 °C and cooling them in air, the required mechanical properties are obtained. In order to obtain the yield/tensile strength ratio below 0.95, the total amount of vanadium and nitrogen should be lower than 2200 ppm.

Key words
low-alloy steel, mechanical properties, micro-alloying, microstructure, vanadium, nitrogen, precipitation

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.

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