AISI 4330V Hot Forged Alloy Steel Hollow Bar

Group Hollow Bars
Min. Order 1 metric ton
Terms of Payment L/C, T/T
Update Time 2020-06-23
Item specifics
Heat treatmentQuenching and Tempering
SurfaceBright or Black Surface
ApplicationOil industry, Raise bore drill rods and drive subs
StandardAMS 6427 AMS 6359 AMS6304 ASTM A646

AISI 4330V Steel

AISI 4330, is a fine-grained, medium carbon, chromium-nickel-molybdenum alloy steel. AISI 4330V is a modification of the 4330 alloy steel grade, with hardenability and other characteristics improved by the addition of vanadium. Alloy Steel 4330V offers good formability which is used for those that require a good combination of strength and impact resistance.

Relevant Standards

AMS 6427, AMS 6359, AMS 6304, ASTM A646, API 7 Specification


Raise bore drill rods and drive subs, gears, aircraft landing gear, axles or shafts for power transmission.

Chemicals and Physical


Mn max

Si max




P max

S max











Tensile strength: 130,000 psi

Yield strength:115,000 psi

Elongation at break (In 50 mm): ≥ 16.0 %

Hardness HBW: 321 - 375

Heat Treatment
Heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each steel component. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities.
Annealing:Heat the steel slowly to 820-860°C and allow enough time for the steel to be thoroughly heated. Cool slowly in the furnace to 580°C followed by air cooling.

Stress Relieving of 4330V Steel
When parts are heavily machined, ground or otherwise subject to cold work, stress relieving will be beneficial prior to hardening.

Hardening of 4330V Steel
4330V steel is usually supplied ready heat treated to 35-39 HRc. If further heat treatment is required annealed 4330V should be heated slowly to 840-875°C and after adequate soaking at this temperature quench in oil. Temper as soon as the tools reach room temperature.

Tempering of 4330V Steel
Heat carefully to a suitable temperature selected by reference to a tempering chart or table, soak at the temperature for 2 hours per 25mm of ruling section, then allow to cool in air.