Naslov
Mechanical Properties and Microstructure of Steel Pipes for Gas Bottles

Autori
Gojić, Mirko ; Kosec, Ladislav ; Kožuh, Stjepan

Izvornik
Kovové Materiály (0023-432X) 39 (2001), 5; 349-357

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
low-alloy steel ; mechanical properties ; microalloying ; microstructure ; vanadium ; nitrogen ; precipitation

Sažetak
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 0.0070-0.00127 wt. % N. Quenching the pipes in oil from 850oC, tempering them at 650oc 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.

Izvorni jezik
Engleski

Znanstvena područja
Metalurgija

Napomena
Glavni autor: Mirko Gojić

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