Cold work tool steel

AISI D2 Tool Steel | DIN 1.2379

AISI D2 Tool Steel | DIN 1.2379
AISI D2 Tool Steel | DIN 1.2379
AISI D2 Tool Steel | DIN 1.2379
AISI D2 Tool Steel | DIN 1.2379
AISI D2 Tool Steel | DIN 1.2379



AISI D2 Tool Steel | DIN 1.2379
Ningshing Special-Steel is DIN 1.2379 / AISI D2  tool steel stockholders and suppliers from china. Over 25 years experience in supplying DIN 1.2379 / AISI D2 tool steel round bar, flat bar and plate.

AISI D2 Tool Steel | DIN 1.2379 is a kind of steel with good hardenability and wear resistance. H
igh oxidation resistance, good corrosion resistance after quenching and polishing, small deformation after heat treatment.

Related Specifications ASTM A681 DIN EN 10083/3 JIS G4053 GB GB/T1299

Hot Rolled Round: dia.10-130 mm
Forged Round: 80-700 mm
Hot Rolled Flat: 6-120 x 40-1000 mm
Forged Block: 80-400 x 100-1000 mm

Delivery Condition
EAF+LF+VD+(ESR), Hot rolled or Forged, Annealed, Hardness≤255HB, Black surface or Machined surface, UT SEP1921 Class3 D/d

D2 1.2379 SKD11 Cr12Mo1V1
Chemical Composition (%)
Steel Grade C Si Mn P S Cr Mo V
1.2379 1.45-1.60 0.10-0.60 0.20-0.60 ≤ 0.030 ≤ 0.030 11.00-13.00 0.70-1.00 0.70-1.00
D2 1.40-1.60 0.10-0.60 0.20-0.60 ≤ 0.030 ≤ 0.030 11.00-13.00 0.70-1.20 0.50-1.10

For making different kinds of cold work molds with high accuracy and long service life, cutting tools and measuring instruments, such as complex-shaped piercing dies, threading screw plates, cold extrusion dies, cold cutting scissors, precision measuring tools etc.

Forging Technique
Heat Temperature Start Forging Temperature Finish Forging Temperature Cooling Method
1120-1160 °C 1050-1090 °C ≥850 °C Thermal Annealing
Heat Treatment


800 to 850°C

Slow controlled cooling in furnace at a rate of 10 to 20°C/hr down to approx. 600°C, further cooling in air.

Hardness after annealing: max. 255 HB.


Stress Relieving

650 to 700°C

Slow cooling in furnace; intended to relieve stresses set up by extensive machining, or incomplex shapes. After through heating, hold in neutral atmosphere for 1 to 2 hours.



1020 to 1040°C

Complex shapes/air, simple shapes/airblast, oil, salt bath from (220 to 250°C or 500 to 550°C). Holding time after temperature equalization: 15 to 30 minutes.

Obtainable hardness: 63 - 65 HRC.



Slow heating to tempering temperature immediately after hardening/time in furnace 

1hour for each 20 mm of work piece thickness, but at least 2 hours/cooling in air.

For average hardness figures to be obtained, please refer to the tempering chart.

For certain cases we recommend to reduce tempering temperature and increase holding 

time. For certain applications requiring improved retention of hardness, a nitriding treatment is recommended.

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