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Die Block Steel DB 1

Chemical composition
ElementMinMax
Carbon, C0.500.60
Manganese, Mn0.600.90
Silicon,Si0.100.35
Sulfur, S0.000.03
Phosphorous, P0.000.03
Mechanical Properties
Properties in hardened and tempered conditionNormalizing Temp. oCHardening Temp.oCQuenching mediumTempering Temp.oC
Tensile strength kgf/mm2Yield stress Min. kgf/mm2
80 - 9554810-840810-840Oil550-660
SOFT ANNEALING

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.

STRESS-RELIEVING

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.

HARDENING
  • 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).
Tensile strength at room temperature

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.

Hardness50 HRC45 HRC
Tensile Strength Rm
N/mm217801420
kp/mm2180145
tsi11492
Yield point Rp0,2
N/mm214601280
kp/mm2150130
tsi9583
Welding

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.

Tempering

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

Quenching media and hardenability

• Vacuum, cooling in gas with sufficient over-pressure
• Warm oil, approx. 80°C (175°F)
• Fluidized bed or salt bath at 250-550°C (480¬1020°F) then cool in air blast
• High speed gas/circulating atmosphere

In order to obtain optimum properties, the cooling rate should be as fast as possible while maintaining an acceptable level of distortion. When heating in a vacuum furnace, min. 4-5 bar overpressure is recommended. Note: Temper the tool as soon as its temperature reaches 50-70°C (120-160°F).