Maraging 300 Alloy Steel (UNS K93120)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
     Annealing
     Cold Working
     Welding
     Forging
     Forming
     Machinability
     Heat Treatment
     Hot Working
     Hardening
     Aging
Applications

Introduction

Alloy steels comprise a wide variety of steels with compositions that exceed the limitations of Si, Va, Cr, Ni, Mo, Mn, B and C allocated for carbon steels. In comparison with carbon steels, alloy steels are more responsive to mechanical and heat treatments.

Alloy steels can be used in specific melting and deoxidization processes for particular applications. These steels have elements such as chromium, cobalt, nickel, etc.

Maraging 300 alloy steel is a very high strength iron base, molybdenum, cobalt and nickel alloy. The following datasheet provides an overview of maraging 300 alloy steel.

Chemical Composition

The chemical composition of maraging 300 alloy steel is outlined in the following table.

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

Physical Properties

The following table shows the physical properties of maraging 300 alloy steel.

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

Mechanical Properties

The mechanical properties of annealed maraging 300 alloy steel are displayed in the following table.

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%

Thermal Properties

The thermal properties of maraging 300 alloy steel are given in the following table.

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

Other Designations

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Equivalent material to maraging 300 alloy steel includes DIN 1.6354.

Fabrication and Heat Treatment

Annealing

Maraging 300 alloy steel can be annealed at 1038°C (1900°F) after cold working and then finally cooled in air.

Cold Working

Maraging 300 alloy steel can be cold worked by conventional methods.

Welding

Maraging 300 alloy steel can be welded by conventional methods.

Forging

Maraging 300 alloy steel can be forged as for stainless 304 alloy.

Forming

Conventional methods are used to readily form maraging 300 alloy steel that has good ductility.

Machinability

Maraging 300 alloy steel has good machinability characteristics.

Heat Treatment

Maraging 300 alloy steel cannot be heat treated for hardening except by aging.

Hot Working

Maraging 300 alloy steel can be hot worked in temperatures ranging 260 to 93°C (500 to 200°F). Age hardening takes place when this alloy steel is exposed to these temperatures for a long time.

Hardening

Maraging 300 alloy steel can be hardened by aging and cold working.

Aging

Maraging 300 alloy steel has high hardness and strength properties and is thus suitable for an aging heat treatment at 482°C (900°F).

Applications

Maraging 300 alloy steel is used for high strength structural applications that include aircraft land gear components.

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