When a part must carry very high loads, aerospace and defence engineers turn to low-alloy and maraging steels. AISI 4340 and 300M are the classic grades for landing gear, shafts and gears, while maraging steels reach ultra-high strength with excellent toughness after a simple ageing treatment.
We supply 4340, 300M and maraging 250 and 300 to AMS specifications, in air-melt and vacuum-remelted (VAR) qualities, as bar, plate, forgings and tube.
Send us the grade, specification, size and heat-treatment condition you need, and we will confirm availability and documentation before quoting.
- Grades
- 4340, 300M, Maraging 250, 300
- Sizes
- Bar, plate, forgings, tube
- Standard
- AMS 6414, 6415, 6419, 6512, 6514
| Grades | AISI 4340 (UNS G43400), 300M, Maraging 250 (UNS K92890), Maraging 300 (UNS K93120) |
|---|---|
| Specifications | AMS 6414 and AMS 6415 (4340), AMS 6419 (300M), AMS 6512 (Maraging 250), AMS 6514 (Maraging 300) |
| Melt quality | Air melt and vacuum remelted (VAR) qualities |
| Forms | Round bar, plate, forgings, tube |
| Condition | Annealed, normalised, or hardened and tempered as specified |
| Sizes | On request — send us your drawing or size list |
| Documents | Mill test certificates and heat traceability — tell us what your programme requires |
Where it's used
Common applications for High-Strength Alloy & Maraging Steels.
Landing gear4340 and 300M structural parts
Shafts, gears & axlesHigh-load rotating parts
Rocket motor casesMaraging steel pressure vessels
Defence vehiclesHigh-strength components
Tooling & diesMaraging steel tooling
Fasteners & fittingsHigh-strength aerospace hardware
Often ordered with
Other products from our stock.
