Forging Alloy Steel 4017
.15 – .20
0.20 – 0.35
0.20 – 0.30
General Characteristics of AISI 4017
This steel is used as a surface-hardening grade. It typifies a range of carbon content found in, say, a 4015 or 4020 type analysis. The molybdenum addition is for prevention of temper brittleness.
Forging AISI 4017
AISI 4017 may be forged as high as 2250ºF (1230ºC) and down to a temperature in the region of 1700ºF (925ºC.) The parts will be air cooled following forging.
AISI 4017 finds uses in the production of forged gears that are subsequently carburized.
Annealing: This grade of steel would rarely be annealed and in fact for optimum machinability an as-forged structure is preferred. A normalizing treatment is recommended in the event that complex forged shapes result in varying structures throughout the parts.
Normalizing: A normalizing treatment may well be necessary during the production of forged gears. A temperature of 1700ºF (925ºC) is recommended, followed by air cooling.
Carburizing: The steel would be carburized at 1650-1740ºF (900-950ºC) followed by water quench for large components of simple shape only, otherwise oil quench.
Hardening: AISI 4017 would be austenitized at a temperature in the region of 1525-1575ºF (830-860ºC) and water quenched in the case of large, simple shapes, otherwise oil quenched.
Tempering: Parts would be tempered at temperatures, based on past experience, that would result in the required mechanical properties.
Machinability: AISI 4017 is readily machined from either an as-forged or normalized structure.
Weldability: AISI 4017 may be readily welded, but only prior to case hardening and subsequent heat treatment.
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