AISI / Alloy Steel 94B30
| Chemical Analysis | |
|---|---|
| C% | Carbon 0.28 – 0.43 |
| Mn% | Manganese 0.75 – 1.00 max |
| P% | Phosphorus 0.040 max |
| S% | Sulfur 0.040 max |
| Si% | Silicon 0.20 – 0.35 |
| Ni% | Nickel 0.30 – 0.60 |
| Cr% | Chromium 0.30 – 0.50 |
| Mo% | Molybdenum 0.08 – 0.15 |
| B% | Boron 0.0005 – 0.003 |
General characteristics of Alloy Steel 94B30
This alloy, a nickel-chromium-molybdenum grade, contains a very small amount of boron, which has a marked effect on its hardenability.
Applications
This grade shows good strength and toughness properties and very good hardenability, this latter as a result of the boron addition. The alloy is used in applications such as forged connecting rods, engine bolts and studs.
Forging
This alloy would be forged at a temperature in the region of 2200ºF to 1700ºF (1205 to 925ºC.)
Heat treatment
Annealing:This alloy may be annealed for optimum machinability to a structure of coarse pearlite with minimum ferrite. The alloy would be annealed at a temperature of 1450 – 1550ºF (790 – 845ºC) followed by furnace cooling.
Normalizing: A temperature in the region of 1650ºF (900ºC) is used in normalizing of this alloy, followed by air cooling.
Hardening: This alloy would be austenitized at 1550 – 1625ºF (845 – 885ºC) and oil quenched or air cooled, depending upon size and complexity of part.
Tempering: The alloy would be tempered at a temperature based on past experience, to give the required mechanical properties.
Machinability : This alloy is readily machined following appropriate heat treatment.
Weldability: The alloy is readily welded by all normal fusion methods, but only in the annealed or normalized conditions, prior to case hardening.
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