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A-2

A-2 Air Hardening Tool Steel

A-2 is an air hardening chromium-molybdenum-vanadium alloy die steel. This grade offers intermediate abrasion resistance generally between O-1 and D-2. A-2 is characterized by:
– Good wear resistance
– Good machinability
– High compressive strength
– Very good non-deforming properties
– Deep hardening
– High dimensional stability after hardening
and tempering

Analysis:


C

CO

CR

MN

MO

NI

P

S

SI

V

W
0.95 – 1.054.75 – 5.500.40 – 1.000.90 – 1.400.10 – 0.500.15 – 0.50

Size Availability:

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

Applications:

Bending DiesBlanking DiesBlock Gauges
CamsCoining DiesCold Forming Dies
Cold ShearsCold Trimming DiesForming Dies
KnurlsMachine PartsMandrels
Plastic Mold DiesPunch PlatesPunchers
ReamersRing GaugesRoll Threading Dies
RollsShear BladesSlitters
Stamping DiesThreading TapsTrimming Dies

Designations:

A-2 Air Hardening Tool Steel-US
Krovan AISI A-2 Air Hardening Tool Steel-US
AFNOR Z 100 CDV 5-France
DIN 1.2363-Germany
JIS SKD 12-Japan
SS 2260-Sweden
B.S. BA 2-United Kingdom
ASTM A681-US
FED QQ-T-570-US
SAE J437-US
SAE J438-US
UNS T30102-US
AISI A2 Cold Work Tool Steel-US

TreatmentTemperature RangeCooling/QuenchingNotes
Forging2000-2100° FCool SlowlyHeat slowly and uniformly. Cool in vermiculite or in other insulating media. Anneal after forging.
Annealing1545-1580° FCool slowly at a rate of 25° F per hour to 1110° F.Protect against surface decarburization using controlled atmosphere or by pack-annealing.
Stress Relieving1020-1200° FCool slowly in furnace to 950° 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.
Hardening1700-1800° 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.
TemperingComplete equalization of temperature throughout the tools 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.

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