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Metric Steel

AISI 1144 – Stressproof (A311-B)

STRESSPROOF® is made by a patented process which consists of drawing the bar through a special die under heavy draft, then stress relieving it in a precisely controlled furnace.

When Niagara LaSalle developed STRESSPROOF® in 1938, it changed the economics of part production. For the first time, users could get an improved wearability without case hardening, strength without heat treating, plus excellent machinability and tool life.

STRESSPROOF® is electro-magnetically tested using eddy currents. Other benefits include resistance to fatigue and stress, balanced working and minimum warpage and distortion.

STRESSPROOF® can also be induction hardened, but should be watched for quench cracks.

Carbon (C)0.40/0.48
Manganese (Mn)1.35/1.65
Silicon (Si)0.15/0.35
Sulphur (S) 0.24/0.33
Phosphorus (P) 0.040 Max.

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

Process Shape Size
Cold drawn
1/2" - 2"

Inquiries call: (905) 664-9911 *Toll Free: 1-888-649-9911 or Fax: (905) 664-9912

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