Heat treatment of wrought iron

Pages204-204
G. Heat treatment of wrought iron
G.1. General provisions
0.1.1. Heat treatment of wrought-iron gear should consist of
heating thee gear uniformly in a suitably constructed muffle furnace
until the whole of the metal has attained a temperature between
600°C (1,100°F) and 650°C (1,200°F), then withdrawing the gear
from the furnace and allowing it to cool uniformly.
G. 1.2. If the past history of wrought-iron gear is not known or
if it is suspected that the gear has been heat-treated at an incorrect
temperature, before putting it to work it should be given normalising
treatment (950°C-1,000°C or 1,750°F-1,830°F) followed by uniform
cooling, precautions being taken during the heat treatment to
prevent excessive scaling.
G. 1.3. (1) Sling assemblies should be made of materials having
similar properties.
(2) When, however, the assembly has some components of
wrought iron and others of mild steel (e.g. mild-steel hooks per-
manently connected to wrought-iron chains), it should be normalised
at a temperature between 920°C and 950°C (1,700°F and 1,750°F),
removed from the furnace and cooled uniformly.
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