BAR STOCK

TOOL STEEL
AISI A2

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AISI A2 Air Hardening Tool Steel

(Machine finish) T & B WITH SAW-CUT EDGES
(Machine finish) FOUR SIDES
PRECISION GROUND
HOLLOW BAR
DRILL ROD

DESCRIPTION

An air-hardening tool steel containing five percent chromium. Replaces the oil hardening ( 0 1 type) when safer hardening, less distortion and increased wear-resistance are required. Provides an intermediate grade between the oil hardening and the high carbon, high chromium (d 2) types.

ADVANTAGES

Low distortion in heat-treatment
Good machinability
High abrasion-resistance and hardness
Good toughness for severe service
Deep hardening properties in large sections

TYPICAL ANALYSIS

CARBON….........1.00
MOLYBDENUM…..1.10
MANGANESE…....0.60
VANADIUM....…..0.25
CHROMIUM…......5.25

HEAT TREAT

FORGING……………… 2000° to 2050° F, stop at
...........................1700°F, cool slowly

NORMALIZING……… Do not normalize

ANNEALING…………. 1650° F, furnace cool, average
...........................Brinell 212

PREHEATING………… 1200° F, prior to hardening

HARDENING…………. 1775° F, air quench to 150°F

TEMPERING………….. 350° to 400° F, resulting
............................hardness, Rockwell C 60-61

MACHINABILITY

Machines easily when properly annealed to 212 Brinell. Has a factor of 65 as compared with a one percent carbon tool steel which has a rating of 100.

TEMPERING RESULTS

The Rockwell C hardness obtained on specimens 1 in square when quenched in air from 1800° F, and quenched in oil from 1750° F and tempered at various temperatures are as follows:

..........................Hardness Rockwell C
Tempering..............1800 F..........1750 F
Temperatures F...Air-Quench....Oil-Quench

None..................64................65
300....................62............62.50
400.....................60................61
500.....................56............57.50
600....................56...............56
700....................56...............56
800....................56...............56
900....................56...............56
1000...................56...............55
1100...................50...............50
1200...................43...............45
1300...................34...............34

These results may be used as a guide in tempering tools to desired hardness. However, since 1 in. specimens were used in this test, tools of heavy section or mass may be several points lower in Rockwell hardness for a given treatment.

Featured Services
Plate Burning
and Plasma
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Up to 16'
Blanchard
Up to 120"
Fabrication
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Heat Treating
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