Available Shapes
AISI 4330V Alloy Steel
AISI 4330 V is a chromium, nickel, molybdenum, vanadium high strength low alloyed steel suitable for downhole tools and drilling jars. It offers improved hardenability and the ability to achieve higher tensile strengths and impact. With its lower carbon content it has better welding characteristics than AISI 4145. AISI 4330V is commonly supplied quenched and tempered with a hardness of between 35 to 39HRc.
Applications
Analysis
Forging
Annealing
Stress Relieving
Hardening
Tampering
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.
Analysis
| Carbon | 0.30-0.34% | Chromium | 0.75-1.00% |
| Manganese | 0.75-1.00% | Molybdenum | 0.40-0.50% |
| Silicon | 0.15-0.35% | Nickel | 1.65-2.00% |
| Phosphorous | 0.035% max | Vanadium | 0.05-0.10% |
| Sulphur | 0.035% max |
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.
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.
Tampering
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.
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