Standard

Name

AISI/SAE

4820

DIN

17CrNiMo6-4

EN

EN 1.6587

Element

Percentage

Carbon (C)

0.15 – 0.21

Silicon (Si)

0.15 – 0.40

Manganese (Mn)

0.40 – 0.70

Phosphorus (P)

0.025 (max)

Sulfur (S)

0.035 (max)

Chromium (Cr)

1.00 – 1.80

Nickel (Ni)

1.50 – 1.80

Molybdenum (Mo)

0.25 – 0.35

Heat Treatment Process

Temperature Range (°C)

Annealing

650-700 cool slowly in furnace

Normalizing

850-880, Air

Hardening

Carburizing: 880-980

Case Hardening: 780-820

Core hardening: 830-870 water, oil quenching

Tempering

150-400