17-4 PH (UNS S17400 / W.Nr. 1.4542)

17-4 PH (UNS S17400 / W.Nr. 1.4542) stainless steel is the most widely used of all of the precipitation-hardening stainless steels. Its valuable combination of properties gives designers opportunities to add reliability to their products while simplifying fabrication and often reducing costs. Type 17-4 PH is a martensitic precipitation-hardening stainless steel that provides an outstanding combination of high strength, good corrosion resistance, and good mechanical properties at temperatures up to 600°F (316°C). Its unique combination of properties make this alloy an effective solution to many design and production problems.

Equivalent Grades

Trademark	GB	GOST	ASTM	UNS	DIN	W.Nr.	NF	BS	JIS	SS
17-4 PH	05Cr17Ni4Cu4Nb	–	630	S17400	X5CrNiCuNb16.4	1.4542	–	–	–	–

Chemical Composition, %

Alloy	C	Si	Mn	P	S	Cr	Ni	Nb+Ta	Cu	Fe
17-4 PH	≤0.07	≤1.0	≤1.0	≤0.04	≤0.03	15.0-17.5	3.0-5.0	0.15-0.45	3.0-5.0	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	900-1100	≥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