Structure and Properties of Weldable Precipitation-Hardening Steel Alloyed with Copper for High-Strength Pipeline Fittings

The influence of heat treatment, simulating thermal cycles and welding in the process of manufacturing joint fittings on microstructure, strengthening phase precipitation, and mechanical properties of base metal and near-weld zone of fittings, made of low-carbon copper-containing steel, is studied....

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Bibliographic Details
Published in:Metallurgist (New York) 2023-03, Vol.66 (11-12), p.1512-1524
Main Authors: Matrosov, M. Yu, Kholodnyi, A. A., Martynov, P. G., Khadeev, G. E., Sakharov, M. S., Yusupov, D. I., Il’ichev, M. V.
Format: Article
Language:English
Subjects:
Analysis
Base metal
Carbon steel
Characterization and Evaluation of Materials
Chemistry and Materials Science
Copper
Fittings
Heat treatment
Impact strength
Iron compounds
Low carbon steels
Materials Science
Mechanical properties
Metallic Materials
Normalizing (heat treatment)
Precipitation hardening steels
Specialty metals industry
Steel, Structural
Tempering
Thermal simulation
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Summary:The influence of heat treatment, simulating thermal cycles and welding in the process of manufacturing joint fittings on microstructure, strengthening phase precipitation, and mechanical properties of base metal and near-weld zone of fittings, made of low-carbon copper-containing steel, is studied. Rolled product specimens are produced under laboratory and industrial conditions. Heat treatment regimes are developed, and mechanical properties of pipeline fittings of strength class K60 (X70) after normalizing with tempering and strength class K65 (X80) after additional quenching before tempering combined with satisfactory impact strength and weldability are provided.
ISSN:0026-0894
1573-8892
DOI:10.1007/s11015-023-01466-8