AISI / Alloy Steel 9315 & 9317
| Chemical Analysis 9317 | |
|---|---|
| C% | Carbon 0.15 – 0.20 |
| Mn% | Manganese 0.45 – 0.65 |
| P% | Phosphorus 0.040 max |
| S% | Sulfur 0.040 max |
| Si% | Silicon 0.20 – 0.35 |
| Ni% | Nickel 3.0 – 3.5 |
| Cr% | Chromium 1.0 – 1.4 |
| Mo% | Molybdenum 0.08 – 0.15 |
| Chemical Analysis 9315 | |
|---|---|
| C% | Carbon 0.13 – 0.18 |
| Mn% | Manganese 0.45 – 0.65 |
| P% | Phosphorus 0.040 max |
| S% | Sulfur 0.040 max |
| Si% | Silicon 0.20 – 0.35 |
| Ni% | Nickel 3.0 – 3.5 |
| Cr% | Chromium 1.0 – 1.4 |
| Mo% | Molybdenum 0.08 – 0.15 |
General characteristics of Alloy Steel 9315 & 9317
These alloys have slightly higher carbon content, hence slightly higher core strengths than 9310 grade. They would be used in similar applications and would undergo similar hot working processes and heat treatments.
Applications
The alloys would be used for components with large cross section requiring high toughness and core strength such as forged gears, crankshafts and heavy-duty gear shafts in aircraft and truck construction.
Forging
The alloys would be forged between 2200 and 1700ºF (1205 and 925ºC)
Heat treatment
Annealing: These alloys would rarely be annealed. Optimum machinability is obtained from an as-forged or normalized structure.
Normalizing: These alloys would be normalized in the region of 1650ºF (900ºC) and air cooled.
Hardening: The alloys would be austenitized, following carburizing, at a temperature of 1450 – 1525ºF (790-830ºC.)
Tempering: A temperature based on past experience would be used to give the required mechanical properties.
Machinability: These alloys would best be machined in the as-forged or normalized condition, prior to case hardening.
Weldability: The alloys are easily welded, but should be welded prior to case hardening.
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