High Tensile Nickel Chrome Steel
Steel AISI 4340

Characteristics
It has high hardenability and is capable of giving good properties in large sections. It is relatively free from temper brittleness and retains useful machinability at relatively high hardness.

Equivalents
Thyssen 6582, DIN 34NiCrMo6, ASSAB 705, VCN 150, JIS SNCM 439, ST90, Atlas Ultimo 200

Availability
Round bar
Diameter : 20mm – 390mm
Standar Length : 6010mm

Chemical Composition
C : 0.38 – 0.43
Mn : 0.60 – 0.80
P : 0.40 (Max)
S : 0.040 (Max)
Si : 0.20 – 0.35
Ni : 1.65 – 2.00
Cr : 0.70 – 0.90
Mo : 0.20 -0.30

Mechanical Properties
Hardening Temp : 820 – 850 C
Ouenching Medium : Oil
Hardness as Supplied : 220 – 250 BHN,

Applications
Automotive crankshafts and rear axle shafts, aircrafts crankshafts, Connecting Rods, Propeller Hubs, Gears, Drive shafts, Landing gear parts and heavy duty parts of rock drill

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