P650 Nonmagnetic Steel

P650 Nonmagnetic Steel is a high-performance austenitic stainless steel specially developed for applications requiring extremely low magnetic permeability, excellent corrosion resistance, and stable mechanical strength. It maintains nonmagnetic properties even after cold working or welding, making it ideal for precision instruments, nuclear energy systems, oil and gas exploration equipment, and marine engineering components.

With a balanced chemical composition of nickel, chromium, and molybdenum, P650 exhibits outstanding resistance to chloride-induced corrosion and stress cracking. It also provides reliable performance under low temperatures and high-pressure environments.

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 P650 Nonmagnetic Steel:

C	Cr	Mn	Ni	Mo	N	Si	P	S
0.03	17.0-19.0	2.0	12.0-14.0	1.5-2.5	0.1-0.25	1.0	0.035	0.015

 

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.):		60 ft.lb	82 J
Endurance Strength / N=10⁵ (min.):		60 ksi	414 N/mm²
Hardness Brinell: (min.):		330-430 HB	330-430 HB

 

Applications of P650 Nonmagnetic Steel:

• Nuclear Industry: Reactor internal components, control rod housings, and structural supports that must remain nonmagnetic under radiation and high temperature.

• Oil & Gas Exploration: Drill collars, downhole tools, and sensor housings used in magnetic-sensitive environments such as MWD (Measurement While Drilling) and LWD (Logging While Drilling).

• Marine Engineering: Subsea equipment, oceanographic instruments, and offshore structural parts exposed to saltwater corrosion.

• Precision Instruments: Magnetic resonance (MRI) equipment, compasses, and navigation systems requiring zero magnetic interference.

• Cryogenic and Aerospace Applications: Components exposed to low temperatures or requiring dimensional stability under extreme conditions.

FAQ

Q1: What is P650 Nonmagnetic Steel?
A: It is an austenitic stainless steel with very low magnetic permeability (μr ≤ 1.01), offering excellent corrosion resistance and stable strength.

Q2: What are the main applications?
A: Used in nuclear power, oil drilling tools, marine equipment, precision instruments, and MRI systems.

Q3: Can P650 be welded or machined?
A: Yes, it has good weldability and machinability without losing nonmagnetic properties.

Q4: What is the difference between P650 and P690?
A: P690 has higher strength, while P650 offers better workability and cost efficiency.

Q5: What certification is available?
A: Supplied with EN 10204 3.1 Mill Test Certificate by SAKYSTEEL.

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,