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 Hard Carbon/ High Chrome Tool Steel 

Precision Marshall’s ARISTOCRAT is an air hardening tool steel which provides exceptional wear resistance with medium toughness, ease of heat treatment and minimum distortion. Special melting and refining practices are utilized to produce a uniform product with high cleanliness and minimum segregation. The material is tested to rigorous tool steel standards to ensure uniformity of structure and freedom from defects. Meets ASTM A-681 and W 2379. 

Typical Analysis

Phosphorus.03 maxMolybdenum1.00
Sulfur.03 maxSilicon.30


ARISTOCRAT is suitable for use in cold work tooling applications requiring maximum wear resistance such as thread roll dies, punches, blanking dies, shears and forming dies. 


Heat slowly and uniformly to 1600/1650° and hold two hours. Cool slowly (50°F per hour max.) to 1400°F, hold six hours and air cool. Hardness 255 BHN maximum. 

Heat Treating

ARISTOCRAT is subject to decarburization during heat treatment, so a protective atmosphere furnace or vacuum furnace should be used. 

After preheating to 1400°F for one half to one hour, heat to 1825/1875°F and soak one half hour when material is up to temperature. Air cool to hand warm (approximately 150°F) and temper immediately. 


Double temper one hour per inch of section thickness to desired hardness, two hours minimum per temper. Representative hardness levels after tempering are tabulated below. 

 Air cooled from 1750°F • Tempered 4 hours

 Tempering Temperature (°F) Rockwell Hardness (RC) 
400 60/62 
500 59/61 
600 57/59 
700 56/58 
800 56/58 
900 57/59 
1000 56/58 
1100 50/54 


Electro-discharge machining is used in the production of various tooling. This process produces recast, rehardened and retempered layers on the EDM surface. It is recommended that ARISTOCRAT D-2 be stress relieved at 50°F below the final tool tempering temperature, after the EDM process, to temper the rehardened layer produced by EDM. 


ARISTOCRAT D-2 is provided completely decarb free and stress relieved. 


Ground oversize to typical rms 50/75, maximum 125. 


Available in standard thickness increments 1/4” thru 8”.