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

20 3月, 2019 admin 0 Comments

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: