42CrMo4 / 4140 / 1.7225 / Scm 440 Alloy Steel Plate Black Surface / Grinded / Machined
product Description
42crmo4/4140/1.7225/scm 440 alloy steel plate
Equivalent grades
GBDINAISIJIS
42CrMo1.7225 4140SCM440
Chemical Composition
CSiMnCr MoPS
0.38-0.430.40max0.60-0.900.90-1.200.15-0.30≤0.035≤0.035
Available size
Round steel bar 10-800mm
Flat steel bar 10-400mm*200-2200mm
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.
