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
