Equivalent grades

GB DIN AISI JIS

42CrMo 1.7225 4140 SCM440

Chemical Composition

C Si Mn Cr Mo P S

0.38-0.43 0.40max 0.60-0.90 0.90-1.20 0.15-0.30 ≤0.035 ≤0.035

Available size

Round steel bar 10-800mm

Flat steel bar 25-400mm*200-800mm

Surface condition

Black surface/ Grinded/ Machined

Hardness

Annealed HBS 217 max

Characteristics

4140 Alloy Steel/SAE 4140 Steel Price is engineering steel supplied in quenched and tempered conditions. Very good machinability. High toughness. High creep strength. Repeated impact resistant capability.

Applications

4140 Alloy Steel/SAE 4140 Steel Price is use to producecomponents with high requirements on toughness, e.g. gear wheels, pinions, connecting rods, parts for mechanical engineering .

Heat treatment

ForgingHeat to 1150°C. Hold until uniform. Minimum forging temperature 850°C.Cool slowly in ashes or sand etc.

AnnealingHeat to 830°C-850°C.Cool in furnace.

NormalisingHeat to 870°C-900°C.Cool in still air.

Stress RelievingAnnealed: Heat to 600°C-650°C.Hardened: Heat to 500°C-550°C.Cool in still air.

HardeningHeat to 830°C-880°C. Quench in oil or polymer.

TemperingHeat to 450°C-700°C cool in still air. NB. Tempering within the range 200°C-420°C will result in temper brittleness and should be avoided.