ThePipingMart Blog Grades Maraging Steel 300 (UNS K93120)- Composition ,Properties, and Uses

Maraging Steel 300 (UNS K93120)- Composition ,Properties, and Uses

Maraging 300

Some people still need to be made aware of what maraging steel 300 is and what benefits it could bring to their applications. This blog post will delve deeper into the composition, properties, uses, and other aspects of maraging steel 300 to help you understand more about this remarkable material.

What is Maraging Steel 300?

Maraging Steel 300 is a high-performance stainless steel renowned for its excellent strength and toughness properties. It has been widely used in various industries for years due to its impressive mechanical and physical characteristics.

Maraging Steel 300 Composition

Maraging steel 300 is a type of austenitic steel composed of various elements, such as iron, nickel, cobalt, molybdenum, and titanium. It is known for its extremely low carbon content, ranging from 0.01% to 0.05%. Combining these elements and low carbon content makes maraging steel 300 a special alloy with impressive mechanical properties. It also boasts excellent corrosion resistance, ideal for various applications.

Element Content (%)
Iron, Fe 67
Nickel, Ni 18.5
Cobalt, Co 9
Molybdenum, Mo 4.8
Titanium, Ti 0.6
Aluminum, Al 0.1
Silicon, Si 0.10
Manganese, Mn 0.10
Carbon, C 0.030
Zirconium, Zr 0.01
Phosphorous, P 0.010
Sulfur, S 0.010
Boron, B 0.0030

Maraging Steel 300 Mechanical Properties

Regarding mechanical properties, maraging steel 300 offers an impressive combination of strength and toughness. It has a tensile strength of up to 2400 MPa and a yield strength of up to 1950 MPa. Moreover, it has a very high fracture toughness, almost unbreakable. These properties make maraging steel 300 ideal for applications requiring high strength and cracking or denting resistance.

Properties Metric Imperial
Tensile strength (@538°C/1000°F) 1158 MPa 168000 psi
Yield strength (@strain 0.200 %, temperature 538°C/@strain 0.200 %, temperature 1000°F) 1056 MPa 153200 psi
Bulk modulus (typical for steel) 140 GPa 20300 ksi
Shear modulus (estimated from elastic modulus) 73.0 GPa 10600 ksi
Elastic modulus 190 GPa 27600 ksi
Poisson’s ratio 0.3 0.3
Elongation at break (in gage length of 4.5 times the square root of the area, @ 316°C/600 °F) 12.00% 12.00%
Reduction of area (@427°C/800°F) 61.30% 61.30%

Maraging Steel 300 Physical Properties

The physical properties of maraging steel 300 are equally impressive. It has a density of 8.0 g/cm3, much lower than most steels. This results in a lightweight material that is easy to handle and install. It also has a high melting point of around 1400°C, which makes it suitable for high-temperature applications.

Properties Metric Imperial
Density 8.00 g/cm3 0.289 lb/in³
Melting point 1412.8 °C 2575°F

Maraging Steel 300 Thermal Properties

Properties Metric Imperial
Thermal expansion co-efficient (@21-480°C/69.8-896°F) 10.1 µm/m°C 5.61 µin/in.°F
Thermal conductivity (20°C) 25.3 W/mK 176 BTU in/hr.ft².°F

Maraging Steel 300 Equivalent

Equivalent material to maraging 300 alloy steel includes DIN 1.6354.

Maraging Steel 300 Uses

Given its unique properties, maraging steel 300 has many applications. It is commonly used in the aerospace, defence, and automotive industries, where its strength and toughness are advantageous. It is also used in the medical and chemical sectors thanks to its excellent corrosion resistance properties. Additionally, maraging steel 300 is used in various applications requiring high wear resistance, such as tooling and cutting applications.

Maraging steel 300 Hardening

Maraging Steel 300 is a martensitic age-hardening nickel steel with superior corrosion resistance due to its high nickel content. In addition, it also contains small amounts of molybdenum and cobalt, which help enhance the material’s strength and formability. Additionally, chromium can be added for more excellent corrosion protection, up to 500 hours of salt spray testing.

Maraging Steel 300 Heat Treatment

Maraging steel 300 can also be heat-treated to enhance its properties further. In particular, it can undergo a process called age hardening, which significantly increases its strength and hardness.

Maraging Steel 300 Machining

Maraging steel 300 has excellent machinability, which means it can be easily shaped, formed, or cut. It can also be welded using conventional welding techniques, although some precautions must be taken to avoid cracking or distortion.

Maraging steel 300 Welding

Maraging steel 300 is a highly durable and robust alloy, ideal for welding due to its strength and resistance to cracking, chipping, and splitting. It has excellent ductility under stress, making welding easier than other steels. The martensitic structure of the steel also helps maintain its strength during welding without compromising its structural integrity.


Maraging Steel 300 is a special steel alloy with impressive mechanical and physical properties. Its unique composition and low carbon content makes it ideal for high strength, toughness, and corrosion resistance applications. It is no wonder that maraging Steel 300 has remained popular in multiple industries, including aerospace, defence, automotive, medical, and chemical. With its ease of machining, welding, and heat treatment, maraging steel 300 is undoubtedly an attractive option for anyone looking for a high-performance material for their applications.

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