AISI / Alloy Steel 4125
| Chemical Analysis | |
|---|---|
| C% | Carbon 0.23 – 0.28 |
| Mn% | Manganese 0.70 – 0.90 |
| P% | Phosphorus 0.040 max |
| S% | Sulfur 0.040 max |
| Si% | Silicon 0.20 – 0.35 |
| Cr% | Chromium 0.40 – 0.60 |
| Mo% | Molybdenum 0.20 – 0.30 |
General characteristics of Alloy Steel 4125
This is a chromium-molybdenum alloy steel used in the case-hardened condition and displaying good strength and toughness properties.
Applications
The alloy is used for components of medium and large cross section, requiring high strength and toughness properties for automotive engineering and gear and engine construction, such as forged crankshafts, steering knuckles, connecting rods, spindles, intermediate gears, pump and gear shafts.
Forging
The alloy may be forged at a temperature in the region of 2200ÂşF (1205ÂşC) down to a temperature of around 1700ÂşF (925ÂşC) and subsequently air cooled.
Heat treatment
Annealing: The alloy may not normally be annealed since optimum machining performance at this carbon level may be found in either an as-forged or normalized structure, the normalized structure being best suited to smaller sections.
Normalizing: At around 1650ÂşF (900ÂşC) and air cooling. Normalizing is advantageous prior to carburizing.
Hardening:Austenitize at 1545 – 1615ºF (840 – 880ºC) and water or oil quench depending on size and complexity of part.
Tempering: Temper at a temperature that will be based on past experience and will give the required mechanical properties.
Machinability
This alloy is readily machinable providing the appropriate heat treatments are employed.
Weldability
This alloy is readily weldable by normal fusion methods, but should always be welded prior to carburizing and other heat treatments.
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