17 -4PH(AMS 5643,UNS S17400)

 

17 -4PH(AMS 5643,UNS S17400) Introduction

 

An American aerospace grade stainless steel that contains 4% copper and may be hardened by a single low-temperature precipitation hardening heat treatment, producing excellent mechanical properties at a high strength level,This grade of stainless steel has a typical density of 7.75kg/dm³ and can be magnetised. 17 4PH finds specific use in applications where a combination of unusually high strength and moderate corrosion resistance is a determining factor. The alloy has similar corrosion resistance characteristics when compared to 304 Stainless steel .

 

APPLICATIONS

 

17-4 PH provides an outstanding combination of high strength, good mechanical properties, good corrosion resistance, outstanding wear resistance and good toughness at temperatures up to 310°C. 17-4 PH is used in chemical, petrochemical, paper and general metalworking industries. Only approved by NACE for restricted components and environments.

 

MECHANICAL PROPERTIES

 

Condition	Yield strength Rp0.2, MPa	Tensile strength Rm, MPa	Elongation [%]	Hardness [HB]	Impact, Charpy-V, -32ºC [J]	Pre
H 900	≥ 1170	≥ 1310	≥ 8	≤ 440		≥ 17
H 1075	≥ 860	≥ 1000	≥ 10	≤ 375	≥ 27	≥ 17
H 1150	≥ 725	≥ 930	≥ 16	≤ 352	≥ 27	≥ 17
DH 1150	≥ 725	≥ 860	≥ 16	≤ 311	≥ 27	≥ 17

 

Heat Treatment
Solution annealing at 1000 to 1050°C, hardened at 480°C (H900) to 621°C (H1150). DH1150: Double aged at 1150F – 620°C.

Weldability
Good, Pre-heating and post-heating practices used for standard hardenable stainless grades are not required.

In what type of applications is 17 -4PH used?

Manufacturing machinery

Chemical processing

Food processing

Pump components

Valving

Fasteners