The 13-8PH alloy is a martensitic, precipitation hardening (maraging) stainless steel.
13-8PH Maraging Stainless Steel Alloy Industry Standard
The 13-8PH alloy complies with the AMS 6514 industry standard and is also known as UNS K44220.
Applications of 13-8PH Maraging Stainless Steel Alloy
The 13-8PH alloy is use for a wide range of applications including:
- Aircraft landing gear
- Aircraft Structural sections
- Aircraft valves and shafts
- Components in the petrochemical and nuclear industries
Heat Treatment of 13-8PH Maraging Stainless Steel Alloy
Condition A
Soak at 927°C (1700°F) and cool below 16°C (60°F) so that material is completely transformed to martensite. Normally, one hour hold at temperature is suggested.
H950, H1000, H1050, H1100, and H1150
Soak solution treated material for 4 hours at specified temperature, air cool.
Chemical Composition of 13-8PH Maraging Stainless Steel Alloy
The Super Alloys 13-8PH alloy has the following chemical composition that gives it its unique properties.
Table 1. Chemical composition of 13-8PH maraging stainless steel alloy
Chemical Elements
|
Min
|
Max
|
Nickel
|
7.5
|
8.5
|
Molybdenum
|
2.0
|
2.5
|
Carbon
|
-
|
0.05
|
Phosphorus
|
-
|
0.01
|
Sulfur
|
-
|
0.008
|
Silicon
|
-
|
0.1
|
Manganese
|
-
|
0.1
|
Iron
|
76.0
|
-
|
Chromium
|
12.25
|
13.25
|
Nitrogen
|
-
|
0.01
|
Mechanical Properties of 13-8PH Maraging Stainless Steel Alloy
The mechanical properties of the 13-8PH alloy following different heat treatments are outlined in the following tables.
Table 2. Mechanical properties under condition A
|
Metric
|
Imperical
|
Tensile Strength, Ultimate
|
1480 MPa
|
215 ksi
|
Tensile Strength, Yield
|
1415 MPa
|
205 ksi
|
Percent Elongation
|
|
|
Hardness
|
|
|
Table 3. Mechanical properties under condition H1150
|
Metric
|
Imperical
|
Tensile Strength, Ultimate
|
1000 MPa
|
145 ksi
|
Tensile Strength, Yield
|
725 MPa
|
105 ksi
|
Percent Elongation
|
|
|
Hardness
|
46 HRc
|
46 HRc
|
Physical Properties of 13-8PH Maraging Stainless Steel Alloy
The physical properties of the13-8PH alloy are outlined in the following table.
Table 4. Physical properties of 13-8PH maraging stainless steel alloy
|
Metric
|
Imperical
|
Thermal Expansion 21°C (70°F)
|
10.6 µm/m-°C
|
5.89 µin/in-°F
|
Thermal Expansion 250°C (482°F)
|
|
|
Thermal Expansion 500°C (932°F)
|
11.9µm/m-°C
|
6.61 µin/in-°F
|
Conductivity
|
14 W/m-°K
|
97.2 BTU-in/hr-ft2-°F
|
Melting Point
|
1405 - 1440°C
|
2560 -2620°F
|
Available Product Forms of 13-8PH Maraging Stainless Steel Alloy
13-8PH alloy is available in the forms of plate, bar, sheet, tube, billet, and forging
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This information has been sourced, reviewed and adapted from materials provided by NeoNickel.
For more information on this source, please visit NeoNickel.