This content is not included in your SAE MOBILUS subscription, or you are not logged in.
High Strength Corrosion Resistant Steel for Aircraft Landing Gears and Structures
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 02, 2021 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Event: AeroTech® Digital Summit
High stressed aircraft landing gear and structural components are subjected to severe loading, corrosion and adverse environmental conditions. Materials such as high strength steels and high-strength titanium alloys are widely used for those critical components. The main criterions for choosing the materials are their strength and fatigue strength, toughness and ductility.
300M steel is widely used for high stress aircraft landing gears and structures; however, this steel is not corrosion-resistant and requires protective coatings.
Cobalt-free, quenched and tempered high strength corrosion resistant steel alloy (“HSCR steel”) provides the same strength, ductility, and toughness as the 300M steel and while it possesses corrosion resistance in salt spray test. HSCR steel has showed no rust after the standard salt spray test in accordance with ASTM B117 using a 5% NaCl concentration, natural pH, at 95°F, for 200 hours test duration.
Aircraft applications of the wrought HSCR steel include landing gear components, rotatable shafts, actuators, flap tracks, slat tracks, fasteners, and others.
Besides forging, the aircraft components can be manufactured from HSCR steel powders by:
- Powder metallurgical-based hot isostatic pressing (PM HIP) to the near net shapes
(NNS) followed by finish machining/surface finishing and heat treatment
- Additive manufacturing (AM) followed by surface finishing and heat treatment.
Modification of the HSCR steel is applicable for vacuum and investment casting of aircraft hydraulic fluid system, motion control and actuation system, cargo system, and flight safety components.
HSCR steel is a low cost alternative of Ti-6Al-4V alloy. The components made from Ti- 6Al-4V alloy can be substituted by the same weight components made from HSCR steel due to HSCR steel possesses slightly higher specific stiffness and specific strength (ratio of modulus elasticity and ultimate tensile strength to density) and slightly lower ductility and toughness compared to Ti-6Al-4V alloy.
Industrial production of HSCR steel is underway.
CitationVartanov, G., "High Strength Corrosion Resistant Steel for Aircraft Landing Gears and Structures," SAE Technical Paper 2021-01-0028, 2021, https://doi.org/10.4271/2021-01-0028.
Data Sets - Support Documents
|Unnamed Dataset 1|
|Unnamed Dataset 2|
|Unnamed Dataset 3|
|Unnamed Dataset 4|
- Vartanov , G. New Steel Suits Aerospace Applications Advanced Materials & Processes 7 May/June 2018
- Vartanov , G. High Strength CRA Ideal for Landing Gear Stainless Steel World Apr. 2017
- Samarov , V. , Seliverstov , D. , and (Sam) Froes , F.H. Fabrication of Near-Net Shape Cost-Effective Titanium Components by Use of Prealloyed Powder and Hot Isostatic Pressing ASM Handbook 7 Powder Metallurgy 2015 660 670
- Carpenter Technology Corp https://cartech.ides.com/datasheet.aspx?i=101&E=268 2000
- Vartanov , G. Steel over Titanium Alloy DSIAC Journal 6 4 4 7 Fall 2019
- Vartanov , G. Cost-Effective Alternative to Titanium for Aircraft Parts Advanced Materials & Processes 22 25 Apr. 2020