VERTEX Air Hardening Tool Steel

Vertex tool steel is a versatile, high-chromium, air-hardening tool steel that is characterized by a relatively high attainable hardness and numerous, chromium-rich alloy carbides in the microstructure. These carbides provide good resistance to wear from sliding contact with other metals and abrasive materials. The primary alloy carbides in Vertex are smaller than the large chromium-rich alloy carbides which are characteristic of D2 tool steel. These smaller carbides result in better impact toughness and superior fatigue properties compared to D2. The molybdenum addition in Vertex enhances the hardness of the alloy carbides, and more significantly, provides superior secondary hardening response compared to D2. Therefore, unlike D2, Vertex can be tempered at higher tempering temperatures yet still attain a hardness in excess of 60 Rockwell C. Because of the higher secondary hardness, Vertex exhibits superior wear resistance compared to D2 tempered at the higher tempering temperatures.


1.00 8.250.502.25 1.000.40

Size Availability:

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


Blanking DiesCoining DiesFood Processing Knives
Forming DiesPunchesRolls
Shear BladesSlittersThread Roller Dies
Trimming Dies


VERTEX Tool Steel-US

TreatmentTemperature RangeCooling/QuenchingNotes
Forging1760-2050° FCool slowlyShould not forge any higher than 2050° F. Cool slowly in furnace or in some other insulating media.
Annealing1600-1650° FCool slowly in furnace at a rate not exceeding 50° F per hour to 1000° FHeat at a rate not exceeding 400° F per hour and hold at temperature for one hour per inch of thickness.
Stress Relieving1200-1250° FCool slowlyHold for one hour per inch of thickness with a 2 hour minimum. Stress relieve after rough machining
Preheating1150-1250° F Equalize then 1400-1450° FAir or pressurized gas.Complex tools should use a double preheat
Hardening1850-1950° FAir cool to under 100° F for maximum hardness responseFor maximum wear, use high side of range. For maximum toughness, use low side of range.
Tempering(See Chart)Air.Temper immediately after quenching. The desired secondary hardening of Vertex will support higher tempering temperatures 970° F and above. Double temper.
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.