Effect of the Initial State of a Steel 38KhN3MFA Billet on the Microstructure and the Mechanical Properties of Seamless Pipes

The effect of the initial structure of 38KhN3MFA steel on the mechanical properties of heattreated seamless pipes is studied. It is found that satisfactory macrostructure, strength, and plastic characteristics are insufficient to achieve the required set of service properties of the end product in t...

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Bibliographic Details
Published in:Russian metallurgy Metally 2017-11, Vol.2017 (11), p.974-979
Main Authors: Vorob’ev, R. A., Dubinskii, V. N., Sorokina, S. A.
Format: Article
Language:English
Subjects:
Banded structure
Billets
Chemistry and Materials Science
Heat treatment
Impact strength
Macrostructure
Materials Science
Mechanical properties
Metallic Materials
Nickel chromium molybdenum steels
Pipes
Steel structures
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Summary:The effect of the initial structure of 38KhN3MFA steel on the mechanical properties of heattreated seamless pipes is studied. It is found that satisfactory macrostructure, strength, and plastic characteristics are insufficient to achieve the required set of service properties of the end product in the presence of a structural heterogeneity in tubular billets. A banded structure can cause a substantial scatter of the mechanical properties of the end product and a decrease in the impact toughness of the steel. It is shown that, in the presence of a banded structure, the required mechanical properties of the end product made of 38KhN3MFA steel can be achieved by correcting the final heat treatment conditions.
ISSN:0036-0295
1555-6255
1531-8648
DOI:10.1134/S0036029517110155