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17 -4PH(AMS 5643,UNS S17400)

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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