Section 49(3) in The Dock Workers (Safety, Health And Welfare) Regulations, 1990
(3)All chains and loose gears made from high tensile steel or alloy steel be plainly marked with an approved mark indicating that they are so made. No chain or loose gear made from high tensile steel or alloy steel shall be subject to any form of heat treatment except where necessary for the purpose of repair and under the direction of a competent person.
