XM-12 / 1.4545 / 15-5 PH
15-5PH is a variant of the older 17-4PH chromium-nickel-copper precipitation hardening stainless steel. Both alloys exhibit high strength and moderate corrosion resistance. High strength is maintained to approximately 600 degrees F. The 15-5 alloy was designed to have greater toughness than 17-4. This improved toughness is achieved by reduced delta ferrite content and control of inclusion size and shape. The fabrication characteristics of 15 – 5 PH are similar to those of other precipitation hardening grades; they can be age hardened by a single step, low temperature treatment.
Material Data Sheet
Main fields of application of 1.4545
- valve parts,
- fittings and fasteners,
- chemical process equipment,
- paper mill equipment,
- aircraft components,
- nuclear reactor components.
Chemical composition of 1.4545
|Cr||14,0 - 15,5||Si||1,0|
|Nb + Ta||0,15 - 0,45|
The key to the properties of precipitation hardening stainless steels lies in heat treatment.
Heat treatments are used to strengthen 15-5 alloys. There are eight standard conditions for 15-5 stainless steel after treatment - H 900, H 925, H 1025, H 1075, H 1100, H 1150, H 1150+1150 and H 1150-M. Heat treating 15-5 PH follows the following steps:
- Conditioning using austenite.
- Air cooling, which turns the austenite into martensite.
- Precipitation hardening until the desired condition is reached.
15-5 PH can be further heat-treated when in precipitation-hardened condition to provide improved resistance to stress corrosion cracking for high temperature applications. Fabrication is recommended after the metal has been heat treated to minimize distortion and stress
|Condition||UTS||Yield Strenght||Elongation||Reduction of area||Hardness Brinell||Hardness Rockwell|
Hempel Special Metals are able to supply this grade in many of the conditions in the following forms :
Sheets / Plates 6.35mm < 101.6mm
Bars from 10mm < 200mm Dia
Material Outlet by Hempel
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Paul MallettAerospace Manager
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