Case Hardening Steels A1444 42CrMo4QT/En19/4140QT/SCM440QT alloy steel bar stock high tensile steel for bolts alloy steel bright bar manufacturer

what is high tensile steel bar

Application:
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                                                                                     

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

how high tensile steel is made Heat treatment                                                      

Forging	Heat to 1150°C. Hold until uniform. Minimum forging temperature 850°C.Cool slowly in ashes or sand etc.
Annealing	Heat to 830°C-850°C.Cool in furnace.
Normalising	Heat to 870°C-900°C.Cool in still air.
Stress Relieving	Annealed: Heat to 600°C-650°C.Hardened: Heat to 500°C-550°C.Cool in still air.
Hardening	Heat to 830°C-880°C. Quench in oil or polymer.
Tempering	Heat 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)
850-1000	665 min	248-302	13 min	54 min

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

Surface condition                                                                          

Black surface/ Grinded/ Machined

Package: wooden case & water proof.

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