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       CODE: 504.682-022 Buy the DOT:Download/CD-ROM
TITLE(s): HEAT-TREATING BLUER (heat treating) alternate titles: dulite-machine bluer
Operates gas furnace that heats metal gun parts to rustproof and impart decorative nonreflecting
blue finish: Sprays parts with steam to remove grease, grit, and dirt. Places parts in barrel of gas
furnace and covers parts with mixture of bone chips and whale or pine tar oil. Closes furnace door
and moves lever to rotate barrel. Turns gas valves and observes pyrometer to regulate temperature of
furnace. Opens door after furnace cools, and pulls lever to tilt barrel and dump contents into
sieve. Sifts parts from bone mixture and quenches parts in oil. Blows oil and chips from blued
parts, using airhose. Examines parts to ensure shade and color conform to specifications, utilizing
knowledge of heat-treating methods and metal properties.
GOE: 06.02.10 STRENGTH: M GED: R3 M3 L3 SVP: 4 DLU: 77
ONET CROSSWALK: 91932 Heat Treating, Annealing, and Tempering Machine Operators and Tenders, Metal and Plastic
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