AIRDI® 150
(AISI D2)
AIRDI 150 is a high carbon, high chromium heat treatable tool steel intended for applications requiring high wear resistance, particularly molding and processing of abrasive plastics.
Typical Chemistry
Carbon 1.55%
Manganese 0.35%
Silicon 0.45%
Chromium 11.50%
Molybdenum 0.90%
Vanadium 0.80%
Typical Applications
Mold Inserts Barrel Liners
Gate/Runner Inserts
Injection/Extrusion Screws
Non-return Valves and Tips
Granulator/Pelletizer Blades
Hardening

Preheat: 1100/1200F (595/650C), equalize, 1400/1450F (769/790C), equalize.

High Heat: 1825/1875F (995/1025C), hold 30/45 minutes at temperature

Quench: Air or positive pressure vacuum. Cool to 150F(65C).

Temper: 400/1000F(205/540C), hold one hour per inch of thickness (two hours minimum) air cool to room temperature. Temper twice.

Cryogenic Treating: Refrigeration treatments may improve long term dimensional stability by transformation of retained austenite. Refrigeration treatments should generally be performed after the first temper, and must be followed by a temper.
Hardness and Impact Toughness Data
Air cooled from 1850F(1010C)
Tempering
Temp.
Hardness
Toughness,
Charpy C-notch
°F
°C
HRC
ft-lbs
Joules
AS QUENCHED
63
 – –
300 150 62 17 23
400 205 61 21 29
500 260 60 23 31
600 315 59 22 30
700 379 58 22 30
800 425 58 21 29
900 480 58 21 29
1000 540 55 19 26

Size Change During Hardening
The amount of retained austenite present has a significant effect on size change during hardening.
Hardening
Temp.
Tempering
Temp.		 HRC Longitudinal
Size Change
%
°F
°C
°F
°C
1850 1010 400 205 61 0/+.03
1850 1010 600 315 59 0/+.02
1850 1010 800 425 58 0/+.02
1850 1010 950 510 56 +.05
Surface Treatments
AIRDI 150 can be given standard surface treatments such as nitriding, titanium-nitride coating, or hard chrome plating if desired. Prior to nitriding or PVD treatment, double temper at or above the process temperature.

Annealing
A. Heat to 1600F(870C), hold 2 hours, cool slowly (25F(15C)/hr maximum) to 1000F(540C), then air cool.
Or
B. Heat to 1600F(870C), hold 2 hours, cool to 1425F(775C), hold 6 hours, air cool.
Typical annealed hardness: 221/225 BHN

Stress Relieving
Annealed Material: Heat to 1200/1250F(650/675C), hold 2 hours, cool in still air.
Hardened Material: Heat to 25/50F(15/30C) below tempering temperature, hold 2 hours, cool in still air.

Welding
Use air hardening tool steel filler material
Annealed Material: Preheat 700/900F(370/485C), maintain over 700F(370C) during welding. Reanneal or temper 1425F(775C) 6 hours after welding.
Hardened Material: Preheat 25/50F(15/30C) below tempering temperature (350F(175C) minimum). Maintain above 350F(175C) during welding. Cool to 150F(65C) after welding. Temper 25F(15C) below original tempering temperature 350F(175C) minimum).

Physical Properties
Modulus of Elasticity ...................................................................30 psi x 106 (207 GPa)
Density .......................................................................................0.278 lb/in3 (7695 kg/m3)
Thermal Expansion
Temperature
Range
Coefficient of Thermal
Expansion
°F
°C
in/in/°Fx10-6
mm/mm/°Cx10-6
RT-400
RT-205
5.7
10.3
RT-/800
RT-425
6.6
11.9
RT-1000
RT-540
6.8
12.2
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