AISI / Alloy Steel 6120

Chemical Analysis
C% Carbon
0.17 – 0.22
Mn% Manganese
0.70 – 0.90
P% Phosphorus
0.040 max
S% Sulfur
0.040 max
Si% Silicon
0.20 – 0.35
Cr% Chromium
0.70 – 0.90
V% Vanadium
0.10 nom

General characteristics of Alloy Steel 6120

This is a case – hardening, chromium – bearing steel with a small vanadium addition. Vanadium acts as a grain refiner, hence strengthener, but has no noticeable effect on hardenability.

Applications

This alloy is used in the manufacture of highly stressed wear parts with medium cross sections for automotive and general engineering applications, e.g. forged camshafts, bushings and connecting rods.

Heat treatment

Annealing: Due to its low carbon content, this alloy may for the most part be processed without the need for annealing. In the event that small sections are to be forged, with a resulting fine structure – particularly in light of vanadium addition – normalizing would be carried out prior to case hardening and subsequent harden and temper.

Normalizing

Normalizing of this grade of alloy is carried out at a temperature in the region of 1650ÂşF (900ÂşC) followed by air cooling.

Hardening

The alloy should be austenitized after case hardening at a temperature in the range 1550 – 1600ºF (845 – 870ºC) followed by oil quenching.

Tempering

The alloy will be tempered at a temperature that is based on past experience and according to mechanical property requirements.

Machinability

The alloy is readily machined following appropriate heat treatment.

Weldability

The alloy is readily weldable by all fusion methods. Welding should be performed in the as-forged or normalized conditions only, not in the hardened and tempered condition.

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