Maraging Alloy 300 - Ultra High Strength Iron-Nickel Cobalt Alloy

Maraging alloy 300 is a very high strength iron base, nickel, molybdenum, cobalt alloy. It may be age hardened to a strength level of 2068 MPa (300 ksi) ultimate with a hardness on the order of Rockwell C 53.

Maraging Alloy 300 Industry Standard

Maraging alloy 300 complies with the AMS 6514 industry standard and is also known as UNS K44220.

Applications of Maraging Alloy 300

The maraging alloy 300 is use in aircraft landing gear

Heat Treatment of Maraging Alloy 250

Hardening is accomplished by a simple aging cycle of 4 to 6 hours at 482°C (900°F) followed by air cooling. Alloy 300 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 300 has the following chemical composition that gives it its unique properties.

Table 1. Chemical composition of maraging alloy 300

Chemical Elements

Min

Max

Nickel

18.0

19.0

Molybdenum

4.7

5.1

Carbon

-

0.03

Phosphorus

-

0.01

Sulfur

-

0.01

Silicon

-

0.1

Manganese

-

0.1

Iron

66.7

-

Calcium

-

0.05

Zirconium

-

0.03

Boron

-

0.003

Cobalt

8.0

9.5

Titanium

0.5

0.8

Aluminum

0.05

0.15

Mechanical Properties of Maraging Alloy 300

The mechanical properties of maraging alloy 300 following different heat treatments are outlined in the following tables.

Table 2. Mechanical properties for solution annealed maraging alloy 300

1500°F (816°C), 1 hr, AC

Metric

English

Tensile Strength, Ultimate

1034 MPa

150 ksi

Tensile Strength, Yield

827 MPa

120 ksi

Percent Elongation

16%

Hardness

30 HRc

30 HRc

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

900°F (482°C), 4-6hrs, AC

Metric

English

Tensile Strength, Ultimate

1930 MPa

280 ksi

Tensile Strength, Yield

1862 MPa

270 ksi

Percent Elongation

5 %

Hardness

52 HRc

52 HRc

Physical Properties of Maraging Alloy 300

The physical properties of maraging alloy 300 are outlined in the following table.

Table 4. Physical properties of maraging alloy 300

Metric

Imperical

Thermal Expansion 21°C (70°F)

8.64µm/m-°C

4.8 µin/in-°F

Specific Heat Capacity

335 J/kg-°K

0.08 BTU/lb-°F

Thermal Conductivity

19.6 W/m-°C

136 BTU-in/hr-ft2-°F

Melting Point

1405 - 1440°C

2560 -2620°F

Available Product Forms of Alloy 300

Maraging alloy 300 is available in the forms of plate, bar, sheet, tube, billet, and forging

This information has been sourced, reviewed and adapted from materials provided by NeoNickel.

For more information on this source, please visit NeoNickel.

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