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AISI 4330v modified steel

AISI 4330v modified steel is a versatile quenched and tempered steel that is characterized by its high toughness and strength and has excellent notched bar impact values at -40°C. These properties are maintained over large cross-sectional dimensions (thicknesses) by the addition of vanadium. For this reason, the material is preferably used in mechanical engineering (high-strength parts) and in the oil and gas sector.

AISI 4340 Special Steel

International identifiers

ASTM A646/A646M-06(2011), 1.6932

Chemical composition

AISI 4330
C Si Mn P S Cr Mo Ni V Cu
min. 0.28 0.80 0.90 0.35 1.80 0.06
max. 0.32 0.40 1.00 0.020 0.010 1.20 0.55 2.10 0.14 0.20


AISI 4330V mod. is very difficult to weld and is therefore not suitable for welded constructions. If welding is unavoidable, a preheating temperature of 400°C and a post-weld heat treatment at 600°C is recommended, or even better a renewed quenching and tempering.

Mechanical Properties:
up to wall thickness 550 mm according to 3.1 inspection certificate:

Hardness: 270-310 HBW
0,2 %-Yield strength: 690 MPa
Tensile Strength: > 865 MPa
Reduction in area (longitudinal): min. 18 %
Impact test (ISO-V) trans: min. 60 J bei -40°C
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