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ASTM A572 grade 50 (columbium-vanadium steel)
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ASTM A572 grade 50 (columbium-vanadium steel)
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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001768
EISBN: 978-1-62708-241-9
... cycling high-strength low-alloy steel cracking Charpy impact tests impact toughness ASTM A572 grade 50 (columbium-vanadium steel) Introduction Splice plates used in power transmission line towers are usually galvanized steel angles made of hot-rolled structural steels [ 1 ]. Several holes...
Abstract
A steel splice plate in a power transmission line tower cracked while in service. Metallographic analysis indicated the presence of a white hard martensite layer near the crack, which occurred in the heel of the plate. Mechanical property tests revealed localized hardening in the area of the crack, supporting the metallurgical findings. A substantial deterioration of the Charpy impact toughness of the material in the heel region was also observed which is believed to have caused the initiation and propagation of the cracks leading to the failure.
