Maraging Alloy 250 - Age Hardenable (Maraging) Iron-Nickel Steel from Super Alloys

Background

The Super Alloys management team are amongst the most experienced professionals in the market. Supported by professional metallurgists and technicians, Super Alloys not only provide access to the largest range of high-tec metals in Europe, but also access to the broadest range of expertise.

The unique combination of access to stock, expertise and rapid delivery reduces lead times and can eliminate costly production delays.

The Super Alloys range of materials includes:

Maraging Alloy 250

Alloy 250 is an age-hardenable (maraging) iron-nickel steel, combining ultra-high strength, toughness and resistance to crack propagation.

Maraging Alloy 250 Industry Standard

S162 British Standard and is also known as UNS K44220.

Applications of Maraging Alloy 250

The maraging alloy 250 has a wide range of application including:

  • Rocket motor casings
  • Light aircraft landing gear
  • Power shafts
  • Low temperature tooling

Heat Treatment of Maraging Alloy 250

Hardening is accomplished by a simple aging cycle of 3 to 6 hours at 485°C (900°F), followed by air cooling. Alloy 250 provides through hardening without quenching, freedom from decarburization, minimal distortion during aging, good formability, machinability, and weldability and a low coefficient of thermal expansion.

Chemical Composition of Maraging Alloy 250

The Super Alloys ultra-high strength maraging alloy 250 has the following chemical composition that gives it its unique properties.

Table 1. Chemical composition of maraging alloy 250

Chemical Elements

Min

Max

Nickel

17.0

19.0

Molybdenum

4.6

5.1

Cobalt

7.0

8.5

Carbon

-

0.03

Aluminum

0.05

0.15

Phosphorus

-

0.01

Sulfur

-

0.01

Silicon

-

0.10

Titanium

0.3

0.5

Manganese

-

0.01

Iron

68.0

-

Mechanical Properties of Maraging Alloy 250

The mechanical properties of maraging alloy 250 following different heat treatments are outlined in the following tables.

Table 2. Mechanical properties for solution annealed maraging alloy 250

816°C (1500°F), 1hr, AC

Metric

English

Tensile Strength, Ultimate

1000 MPa

145 ksi

Tensile Strength, Yield

793 MPa

115 ksi

Percent Elongation

20%

Table 3. Mechanical properties for solution annealed and aged maraging alloy 250

485°C (900°F), 3-6hrs, Ac

Metric

English

Tensile Strength, Ultimate

1800 MPa

260 ksi

Tensile Strength, Yield

1700 MPa

246 ksi

Percent Elongation

8%

Physical Properties of Maraging Alloy 250

The physical properties of maraging alloy 250 are outlined in the following table.

Table 4. Physical properties of maraging alloy 250

Metric

Imperial

Thermal Expansion 21°C (70°F)

9.72 µm/m-°C

5.4 µin/in-°F

Specific Heat Capacity

293 J/kg-°K

0.07 BTU/lb-°F

Thermal Conductivity

19.6 W/m-°C

136 BTU-in/hr-ft2-°F

Available Product Forms of Alloy 250

Maraging alloy 250 is available in the forms of plate, bar, sheet, tube, billet, and forging

For more information on this source please visit Super Alloys International

Comments

  1. MUTHUSAMY KANDASAMY MUTHUSAMY KANDASAMY India says:

    any suggestions about machining condition, compare with AISI 4130

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of AZoM.com.

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