17-7 PH (UNS S17700 / W.Nr. 1.4541)

17-7 PH (UNS S17700 / W.Nr. 1.4541) is a precipitation-hardened stainless steel that is well suited for aerospace and other applications requiring high strength and good corrosion resistance and formability. Type 17-7 PH is a Chromium-Nickel-Aluminum, austenitic stainless steel. It is the most formable of all PH grades and has the highest strength and hardness. It is less magnetic than other PH grades and offers minimal distortion upon heat treatment. This material maintains its valuable properties at temperatures up to 800° F (427° C).

Equivalent Grades

Trademark	GB	GOST	ASTM	UNS	DIN	W.Nr.	NF	BS	JIS	SS
17-7 PH	–	–	631	S17700	–	1.4541	–	–	–	–

Chemical Composition, %

Alloy	C	Si	Mn	P	S	Cr	Ni	Fe
17-7 PH	≤0.09	≤1.0	≤1.0	≤0.04	≤0.03	16.0-18.0	6.5-7.75	Bal

Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3	Melting Point, ℃	Tensile Strength, MPa	Yield Strength, MPa	ELongation, %	Hardness, HRB
7.8	1350-1450	900-1200	≥1000	≥15	/

Available Products and Specifications

Rod, Bar, Wire and Forgings	ASTM A564, 705, SAE AMS 5669
Plate, Sheet and Strip	ASTM A693, SAE AMS 5862
Pipe and Tube	–
Welding Product	–
Others	–

Features

Excellent resistance to corrosion
Provide toughness in both base metals and welds.
Well suited to applications that require ease of fabrication and then the addition of strength/hardness for improved reliability