| Customization: | Available |
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| Product Type: | Rod |
| Material: | FeSi |
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4340 round steel
aisi 4340 Steel
sae4340 steel
4340 alloy
4340 steel plate
Chinese GB steel number: 40CrNi2MoA, 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
4340 Chemical Composition:
C: 0.38 ~ 0.43
Si: 0.15 ~ 0.35
Manganese Mn: 0.60 ~ 0.80
Sulfur S: ≤0.040
P: ≤0.035
Cr: 0.70 ~ 0.90
Mo: 0.20 ~ 0.30
Ni: 1.65 ~ 2.00
Tensile strength σb (MPa) : ≥980(100)
Yield strength σs (MPa) : ≥835(85)
Elongation δ5 (%) : ≥12
Reduction rate of cross-section (%) : ≥55
Impact power Akv (J) : ≥78
4340 Features:
It has high strength, toughness and outstanding hardenability and stability against overheating, but it has high sensitivity to white spots and temper brittleness. Weldability is poor, before welding need to be preheated by high temperature, after welding need to eliminate stress, after conditioning after use.
Mechanical properties:
Elongation δ5 (%) : ≥12
Reduction rate of cross-section (%) : ≥55
Impact power Akv (J) : ≥78
Impact toughness value αkv (J/cm2) : ≥98(10)
Sample size: sample blank size is 25mm
Heat treatment: Editorial report
(Quench 850 degrees; Coolant: oil; Tempering temperature 600 degrees; Coolant: water, oil);
Steel annealing or high temperature tempering supply state Brinell hardness HBW is less than or equal to 269;
Delivery status: Editor reports
Delivery in heat treatment (normalizing, annealing or high temperature tempering) or no heat treatment condition, the condition of delivery shall be indicated in the contract.
4340 Uses:
It is used for important tempering parts requiring good toughness, high strength, and large size, such as heavy machinery high-load shaft, turbine shaft with diameter greater than 250mm, helicopter rotor shaft, turbojet engine turboshaft, blade, high-load transmission parts, crankshaft fasteners. Gear, etc.; It can also be used for rotor shaft and blade whose operating temperature exceeds 400ºC. Can also be nitriding treatment, used to manufacture important parts with special performance requirements, after low temperature tempering or isothermal quenching can be used for ultra-high strength steel.
4340 Uses:
Manufacture important parts with high strength and good plasticity, and manufacture important parts with special functional requirements after nitriding treatment, such as shafts, gears, fasteners, etc.
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