Popular Steel Corporation

DB-2There are three prime requirements for a Die Block
1. That is readily machineable.2. That it will resist stresses imposed in service without fracture.3. That it will produce the required number of forgings without losing shape and at the lowest cost.
Most dies used by the drop forging industry are supplied in the pre-hardened condition and must be readily machineable at high hardness levels. Very low sulphur contents make machining extremely difficult.
Those steels normally supplied hardened are therefore manufactured with controlled sulphur content of .010 to .030%.
Die blocks are subjected to triaxial stresses and uniformity of mechanical properties is a desirable condition.
Press forging demands a die steel with good wear resistance that can withstand the massive compressive stresses and produce forgings to close tolerances. Hammer forging on the other hand requires a predominantly tough die steel, with wear resistance usually the secondary consideration.Chemical composition ElementMinMaxCarbon, C0.500.60Manganese, Mn0.500.80Silicon,Si0.100.35Nickel, Ni1.101.40Sulfur, S-.--0.03Phosphorous, P-.--0.03

Chemical composition ElementMinMaxC0.500.60Mn0.600.90Si0.100.35S0.000.03P0.000.03Ni1.501.90Cr0.951.30Mo0.450.70V0.000.10

Hardened and tempered to 50 HRC. Data at room and elevated temperatures.

Protect the steel and heat through to 890°C (1630°F). Then cool in the furnace at 20°C (40°F) per hour to 850°C (1560°f), then at 10°C (20°F) per hour to 700°C (1290°F), then freely in air.

After rough machining the tool should be heated through to 650°C (1200°F), holding time 2 hours. Cool slowly to 500°C (930°F), then freely in air.

• Preheating temperature: 600-850°C (1110-1560°F) .
• Austenitizing temperature: 1020-1050°C (1870-920°F), but usually 1020°C-1030°C (1870-1885°F).

Soaking time = time at austenitlzIng temperature after the tool is fully heated through.

The tensile strength values are to be considered as approximate only. All samples were taken from a bar (in the rolling direction) 25 mm (1″) diameter. Hardened in oil from 1025 ±10°C (1880 ±20°F) and tempered twice to the hardness indicated.

Good results when welding tool steel can be achieved if proper precautions are taken to elevated working temperature, joint preparation, choice of consumables and welding procedure.

For best result after polishing and photo-etching use consumables with the same composition as in the mould.

Choose the tempering temperature according to the hardness required by reference to the tempering graph. Temper minimum twice with intermediate cooling to room temperature.

Lowest tempering temperature 250 °C(480 °F). Holding time at temperature minimum 2 hours

1. with good hardenability and abrasion resistance.

2. with high oxidation resistance, good corrosion protection after quenching and polishing and little deformation through heat treatment

Used to manufacture different kinds of cold work moulds with high accuracy and long service life, cutting tools and measuring instruments. Such as complex-shaped piercing dies, threading screw plates, cold-extruding dies, cold-cutting scissors, precision measuring tools, etc.

Cold work tool steel 1.2379, die steel 1.2379, DIN 1.2379 mould steel for die casting tools, forming dies, die inserts, hot shear blades. Pressure casting dies and metal extrusion tools for processing light metal alloys,tools for the manufacture of hollows,tools for the screws manufacture,nuts,rivets and bolts

Heat to 840-880°C, cool slowly. This will produce a maximum Brinell hardness of 255. To secure uniform softness.

A popular grade for toolmakers, D2 is used in a wide variety of tool making applications. Typical applications include blanking dies and punches for sheet in stainless steel, brass, copper, zinc and hard abrasive materials generally. Other application include deep drawing dies, cupping dies, forming dies, sheet metal forming rolls, shear blades for strip and sheet including flying shears, circular cutters for cold rolled strip, trimmer dies, thread rolling dies, cold extrusion dies, broaches, plug gauges, ring gauges, special taps, straybolt taps, brick and tile mould liners, master hobs for cold hobbing plastic moulds and cut moulds for plastics

Harden from a temperature of 1000-1040°C followed by oil, warm bath (500-550°C, cooling bath or air. Hardness after quenching is 62-64 HRC.

Stress relieving to remove machining stresses should be carried out by heating to 650-700°C, holding for one hour at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.

Tempering temperature: 150-550°C.