Forging 4340 Alloy Steel Good Ductility Forging 4340 Alloy Steel Factory

Describe:
4340 belongs to the American standard high-strength alloy structural steel,
which is made of high-quality carbon structural steel by appropriately adding
one or more alloying elements (the total content does not exceed 5%).

Corresponding steel number:
China GB steel number 40CrNiMoA, German DIN steel number 36CrNiMo4, German DIN
material number 1.6511, French NF standard 40NCD3, Japanese JIS standard
SNCM439, British BS standard 816M40, American AISI/ASTM4340, American UNS
standard G43400

chemical composition:
C:0.37-0.44 Si:0.17-0.37 S:≤0.035 P:≤0.035
Mn: 0.50-0.80 Cr: 0.60-0.90 Mo: 0.15-0.25 Ni: 1.25-1.65

Heat treatment specification:
Quenching at 850℃, oil cooling; tempering at 600℃, water cooling, oil cooling
Brinell hardness GBW of annealed or high-temperature tempered steel is less
than or equal to 269;

Mechanical properties:
Tensile strength σb (MPa): ≥980(100)
Yield strength σs (MPa): ≥835(85)
Elongation δ5 (%): ≥12
Area shrinkage ψ (%): ≥55
Impact energy Akv (J): ≥78
Elongation δ5 (%): ≥12
Area shrinkage ψ (%): ≥55
Impact energy Akv (J): ≥78
Impact toughness value αkv (J/cm2): ≥98(10)
Sample size: sample blank size is 25mm

Alloy 4340 steel (also known as AISI 4340) is a low alloy steel with high
toughness in the annealed condition. Alloy 4340 is characterized by its
excellent ductility, formability, and weldability, making it an excellent metal
for a variety of structural applications and assemblies, including power
transmission gears and shafts, aircraft parts, and machinery. 4340 steel is
mainly iron based, nickel is another major chemistry. Standard specifications
for the 4340 include AISI 4340, AMS 6359, ASTM A711, and more.

Minimum Order: 2 tons

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