Metallurgical specifications of all configurations of Steel 4330 Mod

General Characteristics
AISI/SAE 4330 mod steel VAC-ARC steel is a modification of 4330 steel with hardenability and other properties improved by the addition of vanadium. It is a low alloy steel capable of being heat treated to high strength levels. The alloy is primarily used in the 220 to 240 ksi (1517-1655 MPa) strength range. The comparatively low carbon content of the alloy make it particularly useful in applications involving shock loading or stress concentration. 4330 VAC-ARC steel is produced by the vacuum consumable electrode melting process to provide optimum cleanliness and preferred ingot structure.

Typical applications: Drive shafts, crankshafts, connecting rods, mining drill rods and oil field tools.
Typical Chemical Composition

Weight % C Mn Si Cr Ni Mo V P S Fe

minimum 0.30 0.75 0.15 0.75 1.65 0.40 0.05 — — reminder

maximum 0.33 1.00 0.35 1.00 2.00 0.50 0.10 0.020 0.010
Physical Properties (Annealed condition)

Characteristics English Metric

Nominal density

(68°F/20°C)
0.283 lbs/in³ 7.83 g/cm³

Specific heat

(212 °F/100°C)
0.160 BTU/lb – °F 669 J/KG- °K

Weight %	C	Mn	Si	Cr	Ni	Mo	V	P	S	Fe
minimum	0.30	0.75	0.15	0.75	1.65	0.40	0.05	—	—	reminder
maximum	0.33	1.00	0.35	1.00	2.00	0.50	0.10	0.020	0.010

Characteristics	English	Metric
Nominal density (68°F/20°C)	0.283 lbs/in³	7.83 g/cm³
Specific heat (212 °F/100°C)	0.160 BTU/lb – °F	669 J/KG- °K

Steel Alloy 4330 Mod