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.


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.


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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