Fatigue-Proof® Chemistry

ASTM A311

Stressproof®

Carbon

0.40 / 0.48

Manganese

1.35 / 1.65

Phosphorus

0.04

Sulfur

0.24 / 0.33

Silicon

0.35 Max.

* AISI 1144M heats to be used for Fatigue-Proof® are usually nitrogen treated, and contain nitrogen in quantities normally associated with steel produced by the electric furnace process.