Forging Alloy Steel 94B30

Chemical Analysis
Mn Manganese
0.75 – 1.00
C Carbon
0.28 – 0.33
P Phosphorus
0.040 max
S Sulfur
0.040 max
Si Silicon
0.20 – 0.35
Cr Chromium
0.30 – 0.50
Ni Nickel
0.30 – 0.60
Mo Molybdenum
0.08 – 0.15
B Boron
0.0005 – 0.003

General Characteristics of AISI 94B30

This alloy, a nickel-chromium-molybdenum grade, contains a very small amount of boron, which has a marked effect on its hardenability.

Forging Applications for AISI 94B30

This grade shows good strength and toughness properties and very good hardenability, this latter as a result of the boron addition. AISI 94B30 is used in applications such as forged connecting rods, engine bolts and studs.

Forging Temperatures of AISI 94B30

AISI 94B30 would be forged at a temperature in the region of 2200ºF to 1700ºF (1205 to 925ºC.)

Heat Treatment

Annealing: AISI 94B30 may be annealed for optimum machinability to a structure of coarse pearlite with minimum ferrite. AISI 94B30 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 AISI 94B30, followed by air cooling.

Hardening: AISI 94B30 would be austenitized at 1550 – 1625ºF (845 – 885ºC) and oil quenched or air cooled, depending upon size and complexity of part.

Tempering: AISI 94B30 would be tempered at a temperature based on past experience, to give the required mechanical properties.

Machinability: AISI 94B30 is readily machined following appropriate heat treatment.

Weldability: AISI 94B30 is readily welded by all normal fusion methods, but only in the annealed or normalized conditions, prior to case hardening.

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