Project Description
AISI 4330V Alloy Steel
Introduce
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.
Applications
Shock loading or stress concentration applications are suited to this steel specification. 4330V is widely used in the oil and gas industry for applications such as oil tools, drill jars and shoes, tool holders and reamers and in the aerospace industry for applications such as bolting and air frames.
Standards
AMS 6427, AMS 6359, AMS 6304, ASTM A646, API 7 Specification
Chemicals Composition
| Grade | C | Mn max | Si max | Cr | Mo | Ni | P max | S max | V |
| 4330V | 0.2-0.30 | 1.0 | 0.80 | 0.40-0.60 | 0.30-0.50 | 1-1.5 | 0.025 | 0.010 | 0.05-0.10 |
Mechanical Properties
| Yield strength Rp0.2,
MPa |
Tensile strength Rm,
MPa |
Elongation [%] | Hardness [HBW] | Impact, Charpy-V, -20ºC [J] |
| 1034 | 1138 | 15 | 341-388 | 32 |
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
When parts are heavily machined, ground or otherwise subject to cold work, stress relieving will be beneficial prior to hardening.
Hardening
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
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.
Forging
Preheat the steel carefully, then raise the temperature to 1070-1230°C for forging. Do not forge below 850°C. 4330V has good forging characteristics but care must be taken when cooling the steel due to its susceptibility to cracking. Cooling in ash or lime after forging is recommended.
Machining
Normalize and Temper at 1250°F(677°C) maximum prior to rough machine. This steel may also be machined at maximum strength, but machining must then be followed with a stress relieving at approximately 400°F(204°C).
Weldability
The steel has good welding characteristics and can be welded by resistance flash welding.
Mill′s test certificate
EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.
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