| Quantity: | |
|---|---|
CHEMICAL COMPOSITION
C: 0.18-0.23
Si: 0.15-0.35
Mn: 0.5-0.9
P: ≤0.02
S: ≤0.02
Ni: ≤0.3
Cr: 0.85-1.25
Mo: 0.15-0.25
Cu: ≤0.2
Al: ≥0.015
MECHANICAL PROPERTIES
Tensile strength (kgf/mm²): ≥95
Elongation (%): ≥14
Cross section reduction rate (%): ≥40
Impact value (J/cm2): ≥6
Hardness (Hb) : 352-362
PHYSICAL PROPERTIES
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.85
Thermal conductivity [W/m.K]: 20.0
Forging of ASTM Grade 4118 Steel
Hot forming temperature: 1100-850oC.
HEAT TREATMENT
Annealing: 850℃ Furnace Cooling
Normalization: 850~900℃ Air Cooling
Hardening: 850-900℃ 1st Oil Cooling, 800-850℃ 2rd Oil Cooling
Tempering: 150~200℃ Air Cooling
CHEMICAL COMPOSITION
C: 0.18-0.23
Si: 0.15-0.35
Mn: 0.5-0.9
P: ≤0.02
S: ≤0.02
Ni: ≤0.3
Cr: 0.85-1.25
Mo: 0.15-0.25
Cu: ≤0.2
Al: ≥0.015
MECHANICAL PROPERTIES
Tensile strength (kgf/mm²): ≥95
Elongation (%): ≥14
Cross section reduction rate (%): ≥40
Impact value (J/cm2): ≥6
Hardness (Hb) : 352-362
PHYSICAL PROPERTIES
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.85
Thermal conductivity [W/m.K]: 20.0
Forging of ASTM Grade 4118 Steel
Hot forming temperature: 1100-850oC.
HEAT TREATMENT
Annealing: 850℃ Furnace Cooling
Normalization: 850~900℃ Air Cooling
Hardening: 850-900℃ 1st Oil Cooling, 800-850℃ 2rd Oil Cooling
Tempering: 150~200℃ Air Cooling
