15-5PH S15500 AMS 5659 precipitation hardening stainless steel

 15-5PH S15500 AMS 5659 precipitation hardening stainless steel

 

Keyword: 15-5PH, S15500, AMS 5659, precipitation hardening stainless steel

 

Introduction

Stainless steel 15 – 5 PH, also known as XM-12 or UNS S15500, is a modification of 17-4 PH developed in the 1960s. It has a more refined microstructure obtained through the remelting process. This refined structure improves toughness of the material. UNS S15500 also has low temperature hardening, good fabrication properties and excellent corrosion resistance, which makes it suitable for many industries. It can be machined in the solution-annealed state or in final heat treat condition.

 

Applications

The following are some of the major applications of Grade 15-5 PH stainless steel:

Marine gas turbine compressor sections, Hallow shafts, Paper mill equipment, Engine parts, Aircraft components, Gears, Fittings and fasteners, Nuclear reactor components

 

Standard

UNS S15500, ASTM A564, AMS 5659

 

Chemical Composition

Grade	C	Si	Mn	P+S max	Cr	Ni	Cu	Cb	Fe	Mo
AMS 5659 15-5	0.07	1.0	1.0	0.03P 0.015S	14.0-15.50	3.50-4.50	2.50-4.50	0.45	Bal	0.50

 

Mechanical properties

Material	Condition	Ultimate Tensile Strength (ksi)	0.2 % Yield Strength (ksi)	Elongation % in 2D	% Reduction of Area	Rockwell C Hardness
Alloy 15-5 PH Bar AMS 5659	Cond A	-	-	-	-	363 HB max
Alloy 15-5 PH Bar AMS 5659	H900	190	170	10	35	388-444
Alloy 15-5 PH Bar AMS 5659	H925	170	155	10	38	375-429
Alloy 15-5 PH Bar AMS 5659	H1025	155	145	12	45	331-401
Alloy 15-5 PH Bar AMS 5659	H1075	145	125	13	45	311-375
Alloy 15-5 PH Bar AMS 5659	H1100	140	115	14	45	302-363
Alloy 15-5 PH Bar AMS 5659	H1150	135	105	16	50	277-352

 

Heat Treatment

UNS S15500 can be machined under any of the attainable conditions. Firstly, the alloy is mildly formed in the overaged condition. It is then welded using welding techniques such as shielded fusion or resistance methods. The material is heat treated at 1038°C (1900°F) for 1/2 h, and then air cooled. This process is followed by hot-working the material and annealing at 1038°C (1900°F) for 1 h. Finally, the alloy can be cold-worked to improve its yield strength.

 

Corrosion Resistance

Precipitation hardening stainless steels have moderate to good corrosion resistance in a range of environments. They have a better combination of strength and corrosion resistance than when compared with the heat treatable 400 series martensitic alloys. Corrosion resistance is similar to that found in grade 304 stainless steel.

 

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