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Chemical Properties



Components with large cross sections requiring high toughness and core strength, such us, gears, crankshafts and heavy-duty gear shafts in aircraft, truck construction and mechanical engineering.

Hot forming and heat treatment:

Forging or hot rolling:1100 - 850°C

Normalising:850 - 880°C/air

Soft annealing:650 - 700°C/furnace

Carburising:880 - 980°C

Core hardening:830 - 870°C/oil

Intermediate annealing:630 - 650°C

Case hardening:780 - 820°C/oil

Tempering:150 - 200°C

Treated for cold shearability, +S:max. 255 HB

Soft annealed, +A:max. 229 HB

Treated for strength, +TH:175 - 229 HB

Treated for ferrite and pearlite

structure and hardness range,

+FP:     156 - 207 HB