17-4 PH / 1.4542

17-4PH is a well-established precipitation hardening martensitic stainless steel capable of achieving very high strength and hardness after a relatively simple heat treatment. It offers excellent corrosion resistance combined with a structured range of mechanical property levels depending on the precise heat treatment applied.

The materials can be readily machined and fabricated in the softer tempers and can then be heat-treated to exceptional strength and dimensional stability. 17-4PH is widely used in the chemical, petrochemical, offshore, paper, and aerospace industries making best use of its outstanding corrosion resistance, wear resistance, strength and hardness.

Specifications

UNS S17400
AMS 5643, AMS 5604, ASTM A564

Main fields of application of 1.4542

Surgical and dental instrument, screwdriver.

17- 4 retains a high strength of precipitation hardening stainless steels a majority of applications are within the aerospace sector and OAG applications

Valves and engine components
Turbine blades
Gears
Shafts
Aircraft structures

Chemical composition of 1.4542

Cr	15,0 - 17,0
Ni	3,0-5,0
Cu	3,0-5,0
C	max 0,070

Characteristics of 1.4542

annealed	specification values
tensile strength Rm	1000-1100 MPa
elongation A	5 - 8
Aged at 480 ⁰C	specification values
tensile strength Rm	1150 – 1350 MPa
elongation A	7 - 15

Heat treatment

Alloy 17-4PH is provided in the solution-annealed condition (Condition A). Mechanical properties may be improved by subsequent age hardening treatments. These aging treatments are commonly described as conditions H900, H1025, H1075, H1150, H1150M and H1150D.

Mechanical Properties

Condition	UTS	0.2% Yield	Elongation	Reduction of area	Hardness Brinel
H900	190.000	170.000	10	40	388
H1025	155.000	145.000	12	45	331
H1075	145.000	125.000	13	45	311
H1150	135.000	105.000	16	50	277
H1150m	115.000	75.000	18	55	255
H1150-D	125.000	105.000	16	50	255

Delivery program

Hempel Special Metals are able to supply this grade in many of the conditions in the following forms :

Sheet/ Plate/ strip 0.2mm < 90mm

Bars 6.35mm Dia < 250mm Dia

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