Alloy Steel 8617

Alloy Steel AISI 8617 General Characteristics

Alloy steel 8617 is a case-hardening steel containing nickel, chromium and molybdenum as alloying elements. The alloy shows good strength and toughness properties, and has a slightly higher core strength than grade 8615.

Chemical Analysis

 C% Mn% P% S% Si% Ni% Cr% Mo%
0.15/0.20 0.70/0.90 0.040 max 0.040 max 0.20/0.35 0.40/0.70  0.40/0.60 0.15/0.25

Applications

This alloy may be used in the production of medium-strength parts such as forged camshafts, fasteners and gears.

 Forging
This alloy is forged at a start temperature of around 2250ºF (1230ºC) and could be forged down to approximately 1700ºF(925ºC.) The alloy is air cooled after forging.

Heat Treatment
Annealing: For optimum machinabilty, an as-forged structure is normally sufficient for this grade of alloy steel. If this proves not to be the case then an iso-anneal from around 1650ºF (900ºC) to 1225ºF (660ºC) will improve machinability.

Normalizing: 1700ºF (925ºC) and air cool. This is another method of improving machinability in this grade; normalizing might also be used prior to case hardening.

Hardening: The alloy will be austenitized at around 1550ºF (840ºC) and oil or water quenched depending upon section size and intricacy.