AMS 5643 17-4PH Stainless Steel Bar

What material is AMS 5643?

AMS 5643 is an aerospace specification for 17-4PH (Type 630) precipitation-hardening stainless steel, known for its high strength, excellent mechanical properties, and good corrosion resistance, making it ideal for aerospace, marine, and industrial parts needing strength up to 600°F. It's a versatile alloy supplied in a machinable solution-treated state (Condition A) and then age-hardened to final strength with minimal distortion.

 

What is AMS 5643 17-4PH Stainless Steel Bar?

17-4PH is a precipitation-hardening martensitic alloy that offers high strength, excellent hardness, good corrosion resistance, and superior mechanical properties that can be adjusted through heat treatment. This versatile material, also known as Type 630 or UNS S17400, is commonly used in demanding applications such as aerospace components, pump shafts, valves, and high-performance fasteners, and is typically supplied in the form of bars, wires, forgings, and tubes.

 

AMS 5643 17-4PH Stainless Steel Bar Chemical Composition

Weight%	C	Si	Mn	P + S max	Cr	Ni	Cb + Ta	Cu
AMS 5643	0.07	1.0 max	1.0 max	0.04 P 0.03 S	15.0 - 17.5	3.0 - 5.0	5 X C / 0.45	3.0 - 5.0
AISI 630	0.07	1.0 max	1.0 max	0.04P 0.03 S	15.0 - 17.5	3.0 -5.0	0.15 - 0.45	3.0 - 5.0

 

AMS 5643 17-4PH Stainless Steel Mechanical Properties

Material	Condition	Ultimate Tensile Strength (ksi)	0.2 % Yield Strength (ksi)	Elongation % in 2D	% Reduction of Area	Rockwell C Hardness
Alloy 17-4PH Bar AMS 5643	Cond A	-	-	-	-	363 HB max
Alloy 17-4PH Bar AMS 5643	H900	190	170	10	40	388-444
Alloy 17-4PH Bar AMS 5643	H925	170	155	10	44	375-429
Alloy 17-4PH Bar AMS 5643	H1025	155	145	12	45	331-401
Alloy 17-4PH Bar AMS 5643	H1075	145	125	13	44	311-375
Alloy 17-4PH Bar AMS 5643	H1100	140	115	14	45	302-363
Alloy 17-4PH Bar AMS 5643	H1150	135	105	16	50	277-352

 

What is AMS 5643 17-4PH stainless steel used for?
It is primarily used in aerospace, defense, and high-strength industrial applications requiring certified performance.

 

 Is AMS 5643 the same as 17-4PH?
AMS 5643 specifies aerospace-grade requirements for 17-4PH stainless steel bars and forgings.

 

What hardness can AMS 5643 17-4PH achieve?
Depending on aging condition, hardness can reach 40–44 HRC in H900 condition.

 

Is AMS 5643 17-4PH corrosion resistant?
Yes. It offers good general corrosion resistance, superior to carbon and alloy steels.

 

Can AMS 5643 17-4PH be heat treated after machining?
Yes. Parts are commonly machined in solution-treated condition and aged afterward.

 

GNEE Product Forms & Supply Range

AMS 5643 17-4PH stainless steel bars are commonly supplied as:

AMS 5643 17-4PH Round bars

AMS 5643 17-4PHSquare bars

AMS 5643 17-4PH Hexagon bars

AMS 5643 17-4PHPrecision-ground bars

AMS 5643 17-4PH Cut-to-length bars for machining

Bars can be delivered in solution-treated (Condition A) or aged conditions according to customer specifications.