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Drill Rod

D-2 Air Hardening Tool Steel

D-2 Air Hardening Tool Steel

D-2 tool steel is a versatile high-carbon, high-chromium, air-hardening tool steel that is characterized by a relatively high attainable hardness and numerous, large, chromium rich alloy carbides in the microstructure. These carbides provide good resistance to wear from sliding contact with other metals and abrasive materials. Although other steels with improved toughness or improved wear resistance are available, D-2 provides an effective combination of wear resistance and toughness, tool performance, price, and a wide variety of product forms.

Analysis:


C

CO

CR

MN

MO

NI

P

S

SI

V

W
1.40 – 1.6011.00 – 13.000.10 – 0.600.70 – 1.200.10 – 0.600.50 – 1.10

Size Availability:

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

Applications:

Blanking DiesBurnishing ToolsCoining Dies
Drawing DiesExtrusion DiesForming Rolls
GaugesKnurlsLamination Dies
Lathe CentersMaster PartsPunches
Seaming RollsShear BladesSlitters
Swaging DiesThreaded Rolling DiesTrimming Dies

Designations:

DIN 1.2379-Germany
B.S. BD 2-United Kingdom
ASTM A681-US
FED QQ-T-570-US
SAE J437-US
SAE J438-US
UNS T30402-US
AISI D2 Air Hardening Tool Steel-US

TreatmentTemperature RangeCooling/QuenchingNotes
Forging2000-2100° FSlow.Heat slowly and uniformly. Do not forge below 1700°F. Cool in vermiculite or other insulating media.
Annealing1545-1600° FCool slowly at a rate of 25° F per hour to 1000° F.Protect against surface decarburization using controlled atmosphere or by pack-annealing.
Stress Relieving1020-1200° FCool slowly in furnace to 930° F. Then in air.Stress relieve after rough machining
Preheating1450-1500° FPreheat time in furnace is ¾ Hr. per inch of thickness. Heating up to temperature as slow as possible
Hardening1800-1900° FIn air.Temper immediately after hardening. Allow to cool to 125-150° F before tempering. Soak time is 15 minutes per inch of thickness. Minimum of 30 minutes.
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.