Cold work tool steel DIN 1.2379/ AISI D2 ---- is chrome-molybdenum-vanadium steel with big hardenability for hardening in oil and in air, especially high resistance to the wear (higher than by 1.2080), good cutting power, very good firmness in the pressure, lower toughness (but higher than by 1.2080). This steel shows good dimensional stability at the heat treatment, suitable for hardening to the secondary hardness (the possibility of nitriding). Further the steel is very difficult to sharpen, it works at the heat with difficulties and has a rather difficult workability in the annealed state.
Equivalent Grade of DIN 1.2379
Chemical Composition of steel DIN 1.2379/ AISI D2 (%)
Hot Forming of steel DIN 1.2379/ AISI D2
Forging: 1050 to 850℃, slowing cooling in furnace.
Heat Treatment of steel DIN 1.2379/ AISI D2
Annealing: 800 to 850℃, slow cooling in furnace (10-20℃/hr), down to approx. 600℃, cooling in air. Hardness after annealing: max. 250HB.
Stress relieving: approx. 650℃, slow cooling in furnace. Hold in neutral atmosphere for 1 to 2hours.
Hardening: 1010 to 1050℃, oil, air or hot bath at approx. 350℃ to 450℃. Hold 15 to 30 minutes. Hardness obtainable, 63 to 65 HRC.
Tempering: 520 to 570℃. Slowly heating to tempering temperature right after hardening. Recommended to temper 2 or 3 times to increase toughness.
* Hardening temperature: 1030℃, specimen size: dia25mm
Nitriding: suitable for nitriding.
Properties of steel DIN 1.2379/ AISI D2
Good dimensional stability; excellent wear resistance due to the ledeburitic structure. Best toughness. Nitriding is possible.
Applications of steel DIN 1.2379/ AISI D2
High performance blanking and punching dies for sheet thickness up to 5 mm; circular and straight shear blades for sheet thickness up to 4 mm; precision stamping dies; cold drawing tools, hobbing dies, thread cutting tools, cold pilger mandrels; flanging rolls; guide rolls; forming rollers for continuous production of steel profiles and tubes; small plastic moulds and inserts for abrasive materials.
Available Size of 1.2379 / D2 steel
|Round：||Dia 2-12mm||cold rolled|
|Dia 12-50mm||hot rolled|
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