Alloy Steel 9310

General Characteristics

This is a nickel-chrome-molybdenum case-hardening steel, with good strength and toughness properties. It shows high hardenability, high core hardness and high fatigue strength.

Chemical Analysis

C% Mn% P% S%  Si% Ni% Cr% Mo%
0.08/0.13 0.45/0.65 0.025 max 0.025 max 0.20/0.35 3.0/3.5 1.0/1.4 0.08/0.15

Principal Design Features

AISI 9310 is a low alloy steel containing nickel, chromium and molybdenum noted for its good hardenability with high impact and fatigue strength. It is often used for carburized case hardened parts.


Components with large cross section requiring high toughness and core strength such as gears, crankshafts and heavy-duty gear shafts in aircraft and truck construction.


This alloy would be forged between 2250 and 1700ºF (1230 and 925ºC.)

Heat Treatment


Not normally annealed: if so sub-critical anneal to give spheroidized structure.


1650-1700ºF (900-930ºC.)


1650-1740ºF (900-950ºC) and oil quench.

Hardening: Core:

1530-1620ºF (830-880ºC) and oil quench


1440-1470ºF (780-800ºC ) and oil quench


340-410ºF (170-210ºC.)


This alloy would best be machined in the normalized condition, prior to case hardening.


The alloy is easily welded, but should be welded prior to case hardening.


Density: 0.283

Specific Gravity: 7.83

Specific Heat: 0.115

Melting Point: 2600

Thermal Conductivity: 238

MCTE: 6.5

MoETensile: 29

MoETorsion: 12


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