Case Hardening Steels A1444 42CrMo4/En19/4140 alloy steel bar stock high tensile steel for bolts alloy steel bright bar manufacturer


what is high tensile steel bar

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 .

Chemical Composition                                                                                     


how high tensile steel is made 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.

Mechanical Properties:

Tensile Strength    (Mpa)Yield Strength (Mpa)Hardness     (HB)Elongation    (%)Izod Impact (J)
850-1000665 min248-30213 min54 min

UT:100% U.T acc. to ASTM AS 1065 -Level 2

Surface condition                                                                          

Black surface/ Grinded/ Machined
Surface condition of 4140 steel bar



ASTM 4140 SCM440 42CrMo4 forged solid steel bar
ASTM 4140 SCM440 42CrMo4 forged solid steel bar