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 1650ºF (900ºC) 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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