A secondary heat effect on the properties of K70 strength class steel for trunk pipelines

The article presents the results of the technological weldability studies for K70 strength class steel. A gradation of the studied semi-finished products by their repairability (by the number of the allowed local reheat of the material during the welding and repair processes) is proposed. The viscos...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2020-04, Vol.826 (1), p.12024
Main Authors: Sharapova, D M, Ganzulenko, O Y, Sharapov, M G
Format: Article
Language:English
Subjects:
Heat affected zone
High temperature effects
Impact strength
Impact tests
Overheating
Viscosity
Weldability
Welding
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Summary:The article presents the results of the technological weldability studies for K70 strength class steel. A gradation of the studied semi-finished products by their repairability (by the number of the allowed local reheat of the material during the welding and repair processes) is proposed. The viscosity reducing of the metal in the overheating zone, determined by the magnitude of the impact test with Charpy samples at the temperature - 40° C was a basis for the gradation condition. The influence of the welding heat input and the number of reheats on the HAZ metal viscosity is established. Thus, the obtained results allow us to state the low technological weldability of this steel, taking into the account such an important indicator as the repairability of the material.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/826/1/012024