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Crucible Steel AIRKOOL® (AISI A2) Tool Steel

Category Metal , Ferrous Metal , Alloy Steel , Medium Alloy Steel , Tool Steel , Air-Hardening Steel
Manufacturer Crucible Steel
Trade Name
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
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Material Notes:
Airkool (AISI A2) is an air-hardening medium alloy tool steel which is heat treatable to HRC 60-62. It has wear resistance intermediate between the oil hardening tool steels (O1) and the high carbon chromium tool steels (D2). Because it offers a combination of good toughness along with moderate wear resistance, it has been widely used for many years in variety of cold work applications which require fairly high abrasion resistance but where the higher carbon/ high chromium steels are prone to chipping and cracking. Airkool is quite easily machined in the annealed condition and, like other air-hardening tool steels, exhibits minimal distortion on hardening, making it an excellent choice for dies of complicated design.Information provided by Crucible Specialty Metals.
Physical Properties Metric English Comments
Density 7.86 g/cc
0.284 lb/in³
Mechanical Properties Metric English Comments
Hardness, Brinell 197 - 241
197 - 241
Annealed
Hardness, Rockwell C 60 - 62
60 - 62
Modulus of Elasticity 207 GPa
30000 ksi
Charpy Impact 53.0 J
39.1 ft-lb
Austenitizing Temperature- 955°C
Thermal Properties Metric English Comments
CTE, linear 10.6 µm/m-°C

@Temperature 20.0 - 260 °C
5.89 µin/in-°F

@Temperature 68.0 - 500 °F
14.0 µm/m-°C

@Temperature 20.0 - 540 °C
7.78 µin/in-°F

@Temperature 68.0 - 1000 °F
Thermal Conductivity 26.0 W/m-K

@Temperature 95.0 °C
180 BTU-in/hr-ft²-°F

@Temperature 203 °F
Shrinkage -0.0600 %

@Temperature 540 - 620 °C
-0.0600 %

@Temperature 1000 - 1150 °F
Tempered at 540-620°C
Component Elements Properties Metric English Comments
Carbon, C 1.0 %
1.0 %
Chromium, Cr 5.25 %
5.25 %
Iron, Fe 91.55 %
91.55 %
As Remainder
Manganese, Mn 0.85 %
0.85 %
Molybdenum, Mo 1.1 %
1.1 %
Vanadium, V 0.25 %
0.25 %
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