P690 Nonmagnetic Steel

P690 Nonmagnetic Steel is a high-strength austenitic alloy specially developed for applications requiring excellent mechanical performance and minimal magnetic permeability. With its outstanding combination of toughness, corrosion resistance, and nonmagnetic stability, P690 has become a preferred material in the oil and gas, marine, defense, and energy industries. Engineered to maintain reliable performance under extreme conditions, this alloy ensures both structural integrity and precision in environments sensitive to magnetic interference. As a trusted supplier, SAKY STEEL provides P690 Nonmagnetic Steel in plates, bars, and forged forms, all certified to EN 10204 3.1/3.2 standards for global engineering projects.

Grade	N850,P750,P690,P550 etc.
Size	Forged Blocks / Squares:Thickness/Width: 100 mm – 400 mm Length: up to 2000 mm Hot Rolled / Forged Round Bars:Diameter: Ø 50 mm – Ø 400 mm Length: 2 m – 6 m (can be customized, up to 8 m)
Technology	Smelting & Refining,Hot Working,Heat Treatment,Cold Working,etc.
Surface Finish	Bright, Peeled, Polished, Turned, Pickled

 

Chemical Composition P690 Nonmagnetic Steel:

C	Cr	Mn	Ni	Mo	N	Si	P	S
0.02	18.0-22.0	5.0-8.0	12.0-15.0	2.0-3.0	0.2-0.4	0.50	0.03	0.01

 

Mechanical Properties :

TEXT	OD	KSI	N/MM
Yield Strength (min.) 0,2%-offset method:	OD up to 9 1/4“	140 ksi	965 N/mm²
	OD 9 1/2“ and larger	130 ksi	900 N/mm²
Tensile Strength (min.):		150 ksi	1035 N/mm²
Elongation (min.):		20%	20%
Reduction of area (min.):		50%	50%
Impact energy (min.):		120 ft.lb	162 J
Endurance Strength / N=10⁵ (min.):		± 90 ksi	± 550 N/mm²
Hardness Brinell: (min.):		350-450 HB	350-450 HB

 

Applications of P690 Nonmagnetic Steel:

P690 Nonmagnetic Steel is mainly used in environments requiring high strength and zero magnetic interference. Typical applications include:

• Oil & Gas: Drill collars, logging tools, MWD/LWD equipment.

• Marine & Offshore: Submarine structures, ROV frames, and seawater-resistant parts.

• Defense: Minesweeping vessels, weapon systems, and guidance equipment.

• Energy & Nuclear: MRI systems, nuclear reactor components, and particle accelerators.

• Instrumentation: Precision sensors, housings, and magnetic shielding parts.

FAQ

1. What is P690 Nonmagnetic Steel?
P690 is a high-strength austenitic alloy with excellent corrosion resistance and very low magnetic permeability (μr ≤ 1.01). It is designed for use in oil & gas, marine, and defense applications where magnetic interference must be avoided.

2. Why is P690 considered nonmagnetic?
Because of its high nickel and manganese content, P690 maintains a fully austenitic microstructure, resulting in extremely low magnetic attraction even under strong magnetic fields.

3. What is the typical strength of P690 steel?
The alloy offers a minimum yield strength of 690 MPa with high toughness and ductility, even at low temperatures.

Why Choose SAKYSTEEL :

Reliable Quality – Our stainless steel bars, pipes, coils, and flanges are manufactured to meet international standards such as ASTM, AISI, EN, and JIS. Strict Inspection – Every product undergoes ultrasonic testing, chemical analysis, and dimensional control to ensure high performance and traceability. Strong Stock & Fast Delivery – We maintain regular inventory of key products to support urgent orders and global shipping. Customized Solutions – From heat treatment to surface finish, SAKYSTEEL offers tailor-made options to match your exact requirements. Professional Team – With years of export experience, our sales and technical support team ensures smooth communication, quick quotations, and full documentation service.

SAKY STEEL'S Quality Assurance (including both Destructive and Non-Destructive) :

1. Visual Dimension Test 2. Mechanical examining like tensile, Elongation and reduction of area. 3. Impact analysis 4. Chemical examination analysis 5. Hardness test 6. Pitting protection test 7. Penetrant Test 8. Intergranular Corrosion Testing 9. Roughness Testing 10. Metallography Experimental Test

Custom Processing Capabilities:

• Cut-to-size service

• Polishing or surface conditioning

• Slitting into strips or foil

• Laser or plasma cutting

• OEM/ODM welcome

SAKY STEEL'S Packaging:

1. Packing is quite important especially in a case of international shipments in which consignment pass through various channels to reach the ultimate destination, so we put special concern regarding packaging. 2. Saky Steel's pack our goods in numerous ways based on the products. We pack our products in multiple ways, such as,