Technical Data Sheet
BS S159 is the British aerospace standard for stainless steel alloy Jethete M152. S159 is a creep and corrosion resistant, hardened and tempered steel with a usual upper temperature limit of 560°C. It combines very good toughness and creep rupture properties making it an excellent alloy for use in highly stressed turbine blades, discs, screws, bolts and rings. S159 is usually supplied in the finally heat treated condition, although is available softened at larger diameter, and has a limiting ruling section of 50mm (2″).
The heat treatment for BS S191 is as follows:
Softening: 680-700°C for 2 hours min followed by air cool – Designated BS S159A
Harden: 1050°C (+/-10) for 30 minutes min followed by air cool
Temper: 560-590°C for 3 hours min followed by air cool – Designated BS S159D
Stress Relieve: Can be performed on hardened and tempered bars if a cold rolling operation has taken place, by holding at 30°C lower than the tempering temperature.
