1.4545 - 15-5Ph Pipe

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.

Stainless Steel 15-5 PH Pipes & Tubing Chemical Composition

Grade	C	Mn	Si	S	Al	Fe	Ni	Cr	Cb+Ta
SS 15-5 PH	0.07	1.0 max	1.0 max	0.03	–	Bal	3.5 – 5.5	14.0 – 15.5	0.15 – 0.45

The alloy can be hardened by heat treatment. Annealing minimize distortion and tension of the material.

Mechanical properties (20°C)

s_in the Limit of short-term strength 1100−1378 MPa

s_T — yield stress for permanent deformation 900−1275 MPa

d₅ — elongation at break.14%

Stainless Steel UNS S15500 Pipes & Tubes Equivalent Grades

STANDARD	WERKSTOFF NR.	UNS
SS 15-5 PH	1.4545	S15500

15-5PH is mainly used for particularly heavy parts in the aerospace industry, as well as for components of machines in the petrochemical, chemical, as well as food and paper industries, which are exposed to corrosive and stressful environments.

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