17-7PH AISI 631 1.4568 stainless steel

What is the material grade 1.4568?

17-7 PH (1.4568) is a precipitation hardening semi-austenitic stainless steel that can develop extremely high strength thanks to the strengthening effect of aluminium particles. This grade is typically found in strip or wire form for spring applications.

 

What is the standard for 1.4568 stainless steel?

Grade :	X7CrNiAl17-7
Number:	1.4568
Classification:	Martensitic and precipitation-hardening steels - special grade
Density:	7.8 g/cm ³
Standard:	EN 10088-2: 2005 Stainless steels. Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes EN 10088-3: 2005 Stainless steels. Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products of corrosion resisting steels for general purposes EN 10151: 2003 Stainless steel strip for springs. Technical delivery conditions EN 10088-1: 2005 Stainless steels. List of stainless steels EN 10088-5: 2009 Stainless steels. Technical delivery conditions for bars, rods, wire, sections and bright products of corrosion resisting steels for construction purposes EN 10088-4: 2009 Stainless steels. Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for construction purposes

 

EQUIVALENT GRADES OF 1.4568 Stainless Spring Steel Wire:

STANDARD	WERKSTOFF NR.	UNS	JIS	BS	GOST	AFNOR	EN
631	1.4568	S17700	SUS631	301S81	20Ch17N2	Z8CNA17-07	X7CrNi17-7

 

CHEMICAL COMPOSITION OF 1.4568 Stainless Spring Steel Wire:

Grade	C	Mn	Si	S	Cu	Fe	Ni	Cr
631	0.09-0.11 max	1.00max	1.0 max	0.030max	1-1.5	Bal	6.5-7.75	16.00-18.00

 

1.4568 Stainless Spring Steel Wire Mechanical Properties

Grade	Tensile Strength (MPa) min	Yield Strength 0.2% Proof (MPa) min	Elongation (% in 50mm) min
631	980	725	15

 

What heat treatment processes are used for 17-7PH?

Solution Annealing: Usually at 1040–1065°C followed by air cooling

Precipitation Hardening: Aging at 480–620°C to achieve desired strength and hardness

Heat treatment controls the balance between corrosion resistance and mechanical strength.

 

What are the typical applications of 17-7PH stainless steel?

Aerospace components: springs, fasteners, landing gear parts

Industrial valves and chemical equipment

Automotive parts requiring high strength and corrosion resistance

Marine and oilfield applications where both strength and corrosion resistance are needed

 

How Does 17-7PH Compare To Other Stainless Steels Like 17-4PH?

17-7PH has Higher Ductility And Better Corrosion Resistance than 17-4PH,17-4PH typically achieves higher hardness but slightly lower toughness.

 

If you have a project need for 1.4568 stainless steel wire, we welcome your order. GNEE has a large inventory of popular products for you to choose from. We process these products into a variety of practical product forms, including sheet, coil, tube, bar, and wire. For detailed chemical composition and free samples, please contact our factory today. We offer competitive pricing and excellent service.Email: sales@gneestainless.com