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
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what is high tensile steel bar
Application:
4140 Alloy Steel/SAE 4140 Steel
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 |

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