S-7 Shock Resisting Tool Steel


S-7 is an air or oil hardening tool steel that is characterized by very high impact toughness. The combination of strength and high toughness makes S-7 tool steel a candidate for a wide variety of tooling applications. S-7 tool steel can be used successfully for both cold and hot work applications.

Analysis:

C CO CR MN MO NI P S SI V W
0.45 - 0.55 3.00 - 3.500.20 - 0.901.30 - 1.80 0.20 - 1.000.35 Max.

Size Availability:

Flats • Hollowbar • Metric • Non-Standard • Rounds • Squares • Standard

Applications:

Blanking DiesBrake DiesChisels
Die Casting Dies - ZincForming DiesGripper Dies
Header DiesHeading Dies - HotMaster Hobs
Plastic Mold DiesPunchesRivet Sets
Shear Blades

Designations:

AISI S7 Tool Steel-US
ASTM A681-US
UNS T41907-US

TreatmentTemperature RangeCooling/QuenchingNotes
Forging1900-2050° FSlow.Cool slowly in furnace or in other insulating media.
Annealing1500-1600° FCool slowly at a rate of 25° F per hour to 1000° F.Hold at temperature for 2 hours.
Stress Relieving1000-1200° FCool slowlyStress relieve after rough machining
Preheating1200-1250° FPreheat time in furnace is ¾ Hr. per inch of thickness. Heating up to temperature as slow as possible.
Hardening1700-1750° FIn air. Larger sections may require oil quenching.Soak time is 30 minutes per inch of thickness. Minimum of 1 hour. Allow to cool to 125-150° F before tempering.
Tempering(See Chart)Complete equalization of temperature throughout the tool is essential for good results. Double temper. Recommended temperature is 400-1000° F.
Data is typical and should not be construed as actual values for any category.
Applications and technical information require engineers and tool designers to exercise independent judgement.