Steel quality grade mark

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Appendix F
Steel quality grade mark
F.1. The quality grade mark to be placed on any steel com-
ponent of loose gear in accordance with section 4.2.6, paragraph 6,
should be as follows:
F.2. The third column of the table above relates to the mean
stress in a piece of chain made up in accordance with the appropri-
ate ISO standard for the material at the breaking load specified in
the standard.
Quality grade mark Grade of steel Mean stress (N/mm2)
L Mild 300
M Higher tensile 400
P Alloy 500
S Alloy 630
T Alloy 800

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