CPM REX 76® Powder Metal


CPM REX 76® is a super high speed steel made by the Crucible Particle Metallurgy Process. It has high carbon, vanadium and cobalt for abrasion resistance comparable to T15 and superior red hardness. CPM REX 76 is heat treatable to 68/70 HRC. Its high hardness, fine grain size and uniform carbide distribution make it outstanding for special purpose cutting tools beyond the capabilities of the AISI Type M40 series high speed steels. The best applications are where high red hardness, high abrasion resistance, and good toughness can be used to advantage.

Analysis:

C CO CR MN MO NI P S SI V W
1.508.503.750.30 Min.5.25 0.06 Min.0.303.109.75

Size Availability:

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

Applications:

BroachesEnd MillsForming Tools
HobsMilling CuttersShaper Cutters
Taps - SpecialTool Bits

Designations:

AISI M48-US
CPM REX 76(HS)-US

TreatmentTemperature RangeCooling/QuenchingNotes
Forging2000-2100° FSlow cool.Do not forge below 1700° F.
Annealing1600° FSlow cool maximum 30 ° F per hour and then air or furnace cool.1600° F and hold 2 hours. Slow cool maximum 30° F per hour to 1000° F, then air or furnace cool.
Stress Relieving1100-1300° FAir or furnace cool.After Machining: Hold for 2 hours.

Hardened Parts: Temper 25° F below original tempering or 1000° F minimum.
Preheating1500-1550° F1500-1550° F and equalize. Second preheat at 1850-1900° F.
Hardening2100-2190° FSalt, oil or atmosphere quench to 1000-1100° F, equalize and then air cool to below 125° F or hand warm. Vacuum or atmosphere quench rate through 1850-1300° F range critical to achieve optimum heat treat response.Standard recommendation to achieve HRC 67/69 is 2150-2175° F.
Tempering(See Chart)1000° F minimum recommended. Temper or quadruple tempering required.
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.