Cosmonautics Day: the role of precision alloys and special steels in aerospace

April 12 is a landmark date in human history. On that day in 1961 Soviet cosmonaut Yuri Alekseyevich Gagarin made the first flight into space aboard the Vostok-1 spacecraft, ascending to near-Earth orbit and completing an orbital circuit of Earth. This flight was not merely a scientific breakthrough — it marked the start of a new era, opened the way to space exploration, and symbolized technical power, courage, and engineering thought.

Today Cosmonautics Day is not only a commemorative date but also a reason to recall the complex and multifaceted work without which this breakthrough would have been impossible. One of the key components of that work is materials science — more precisely, the use of precision alloys and special steels able to withstand extreme loads and extreme service conditions.

Interesting facts about Cosmonautics Day

• The first flight lasted only 108 minutes, but became a turning point in the scientific and technical development of humankind.
• In honor of Gagarin’s flight April 12 is celebrated annually as Aviation and Cosmonautics Day in Russia and as International Day of Human Space Flight (by UN decision since 2011).
• In 1981, exactly 20 years after Gagarin’s flight, the USSR launched the first space shuttle “Buran”, which became an analogue of the American shuttle and an example of high achievements of domestic engineering.
• Already today space hosts not only satellites and stations, but also 3D-printing technologies, robots, telemedicine, and autonomous control systems.

Extreme conditions — extreme requirements

Space exploration is impossible without developing new materials. First of all — precision alloys and special steels that ensure safety, reliability, and efficiency of both aviation and space technology. 

Modern aircraft and satellites operate under conditions that cannot be modeled in conventional technology. They include:

• Temperature swings from -196°C to +1100°C.
• Aggressive environments, radiation, and ultraviolet radiation.
• Colossal vibrational and dynamic loads at launch, in flight, and on landing.
• Impact and cyclic stresses, especially under pressure swings.

Such conditions require special materials — alloys with high heat resistance, cryogenic resistance, and corrosion and vibration resistance. Below are the main factors that place elevated requirements on materials.

High temperatures

On takeoff, high-speed flight, and atmospheric entry materials are exposed to powerful thermal effects. High temperatures arise during engine operation and friction of parts. In space heating can occur due to solar radiation and friction on planetary atmospheric entry. 

For high-temperature service various materials with elevated heat resistance, high-temperature strength, and ability to retain mechanical properties at high temperatures are used. For example:

• Steel grade 20Kh13 — corrosion-resistant and heat-resistant. Used in compressor blades, valves, turbine housings, discs, and other elements operating at temperatures up to 500°C. Resistant to oxidation; has good strength on heating and under mechanical load.
• Nickel alloys — withstand temperatures up to 1100°C; used in assemblies requiring maximum heat resistance, for example nozzles, flame tubes, turbine blades, and heat shields.

Low temperatures

In the stratosphere and in space temperature can drop to -196°C. Under such loads ordinary materials become brittle. However special cryogenic austenitic-class steels retain strength and do not lose their properties on cooling. For example:

• Steel 12Kh18N10T — operates from -196 to +600°C, resistant to corrosion and mechanical loads; used in welded structures, high-pressure vessels, and tanks for storing liquid hydrogen and oxygen. In aggressive environments it is used at temperatures up to +350°C. Briefly withstands temperatures up to +850°C.

Pressure swings

Sharp pressure swings at rocket launch, exit into open space, or return to the atmosphere require absolute leak tightness and structural stability. Therefore materials with high impact toughness and resistance to cyclic loads are used.

Vibrational loads

During engine start, spacecraft docking, and other operations the airframe and equipment are subjected to severe vibration. Strong structures of special steels ensure resistance to microdamage and fatigue failure. These conditions make clear the need to use high-quality precision alloys and special steels to retain stable operating characteristics under any conditions.

Precision alloys and special steels: what underlies aerospace technology

Precision alloys are not merely high-quality materials. They are the foundation of reliability, safety, and efficiency of modern aerospace technology. They are characterized by strictly controlled chemical composition, high property precision, and resistance to external effects.

Here are only some of their application areas:

• Engines and power plants
  Engines are the heart of any flying technology. They operate at extreme temperatures and pressures, so material selection for them faces special requirements. Alloys used:
  
  • 49K2FA-VI, 27KKh — used in rotors, stators, and other engine parts. Combine high mechanical strength and magnetic permeability; resistant to deformation.
• Control and navigation systems
  Flight safety depends on the accuracy of these systems. Alloys with high stability of magnetic and mechanical properties ensure their uninterrupted operation:
  
  • 50N, 50NP, 79NM, 80NM, 81NMA — used in gyroscopes, sensors, and servomotors, ensuring positioning accuracy and reliability under temperature fluctuations and vibration.
• Electronics and instruments
  Modern aircraft and spacecraft are saturated with electronics for which operating stability under complex service conditions is critical:
  
  • 29NK, 33NK, 36N, 42N — these alloys are used in microcircuit housings, relays, and contacts. They have a minimal thermal expansion coefficient, corrosion resistance, and resistance to high temperatures.

Each of these alloys is the result of years of research and engineering development. Their mass application is impossible without reliable producers with high-tech modern equipment and strict quality control.

Modern development of the aerospace industry

Aerospace is not only rockets and satellites; it is a global technological ecosystem that includes:

• Private space developments
  SpaceX, Blue Origin, and Russian projects of small satellites and private orbital vehicles raise competition and stimulate introduction of innovative technologies.
• Digital design and modeling
  Use of digital twins, AI models, and simulators reduces time and cost of developing new vehicles.
• Next-generation materials
  Composite materials, carbon nanostructures, and high-temperature superconductors are actively developed — all of this requires symbiosis with traditional metals and alloys.
• Reusable space systems
  Use of reusable stages and landing modules requires not only new designs but also materials with improved cyclic strength.
• Transition to environmentally friendly fuels
  This requires rethinking composition and behavior of materials under new conditions: cryogenic, chemically aggressive, and dynamically unstable.

Despite the development of composites, metallic alloys remain the foundation of critically important assemblies: engines, stiffness members, heat-dissipating structures, and control systems. Their role is especially important where reliability and predictable behavior under extreme loads are required, high processability in machining and assembly, and stability of magnetic and thermal characteristics.

Why development of the precision alloys industry is decisive for aviation and cosmonautics

For further aerospace industry development it is important not only to use existing materials but also to develop new ones. Here are key growth directions:

• Innovations in materials science
  Creating new alloys with improved characteristics (strength, stability, heat resistance) opens horizons for designing lighter, more reliable, and more economical aircraft.
• Raising competitiveness
  Developing domestic metallurgical and mechanical-engineering potential allows a country to offer competitive products on the world market, take part in international space programs, and export technologies.
• Import substitution and technological independence
  A domestic scientific base and production capacity in precision alloys reduce dependence on external suppliers and ensure stability of strategic industries.

The St. Petersburg Precision Alloys Plant (PZPS) is an enterprise with many years of experience producing steels and alloys for the most important industries, including aviation, power generation, shipbuilding, and aerospace.

PZPS — a reliable partner for the aerospace industry

PZPS is one of the leading domestic producers of special steels and precision alloys. Thanks to a high level of competence, modern equipment, and a strict quality control system the enterprise successfully supplies products for key industries, including aviation and aerospace.

We carry out quality control at all production stages — from melting to machining and packaging. We continuously modernize production, launching new induction furnaces, rolling mills, heat-treatment furnaces, and nondestructive testing systems. 

For cooperation questions call +7 812 740–76–57 or leave a request on the website. Our specialists will select steels suited to the most extreme conditions and, if needed, analyze your materials or develop new alloys that strictly match your technical requirements.

‍