Description
SEW 550 Steels for heavy forgings – Quality requirements, 4th edition December 2024
SEW 550 covers steels predominantly used for mechanical engineering purposes, which are used to produce larger open die forged components in the quenched and tempered or normalised condition. (SEW 555 applies for energy technology).
The first edition of SEW 550 was published 1951, followed by editions 1957 and 1976. Afterwards, ISO 683-2 and EN 10250 were developed which have different steel grades and material properties compared to SEW 550. The wall thickness range is between 160 and 750 (1000) mm.
SEW 550 specifies the chemical composition, sampling, mechanical properties (in sample locations L, T and Q) as well as testing and documentation. Annex A provides formulae to calculate the relevant heat treatment diameter. New in SEW 550 is the hardenability criterion. Compared to the 3rd edition 1976, 7 steel grades were added and 2 removed. This SEW is available for the first time in English translation.
4. Edition, December 2024
