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N850 Nonmagnetic Steel | High-Strength Austenitic Stainless Steel
N850 Nonmagnetic Steel is a premium-grade austenitic stainless steel designed for applications where non-magnetic properties, high strength, and corrosion resistance are critical. This material is widely used in the oil & gas industry, mining, and geophysical exploration equipment. Compared with conventional stainless steels such as 304L or 316L, N850 offers superior non-magnetic stability and excellent mechanical performance under extreme working conditions.
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 N850 Nonmagnetic Steel:
C Cr Mn Ni Mo N Fe
0.06 17.0-19.0 1.5-2.0 11.0-13.0 2.0-3.0 0.2-0.3 Bal
 
Mechanical Properties :
TEXT OD KSI N/MM
Yield Strength (min.) 0,2%-offset method: OD up to 10“ 150 ksi 1035 N/mm²
Tensile Strength (min.):   160 ksi 1104 N/mm²
Elongation (min.):   15% 15%
Reduction of area (min.):   50% 50%
Impact energy (min.):   100 ft.lb 135 J
Endurance Strength / N=10⁵ (min.):   ± 90 ksi ± 620 N/mm²
Hardness Brinell: (min.):   300-430 HB 300-430 HB
 
Applications of 1.4841 Forged Stainless Steel Bar:

  • 1. Oil & Gas Industry

    • Nonmagnetic Drill Collars – widely used in drilling strings to reduce magnetic interference during directional drilling.

    • MWD/LWD Tools (Measurement/Logging While Drilling) – ensures accurate downhole survey data without magnetic distortion.

    • Stabilizers and Drill String Components – high strength with stable non-magnetic performance.

    2. Mining and Geophysical Exploration

    • Geophysical Logging Equipment – protects sensitive sensors from magnetic interference.

    • Non-magnetic Housings & Cases – used for survey instruments in mining operations.

    • Exploration Tools – stable under tough geological conditions.

    3. Marine & Offshore Engineering

    • Subsea Structures – withstands seawater corrosion with non-magnetic properties.

    • Connectors & Fasteners – high reliability for offshore oil platforms and ROV tools.

    • Underwater Measuring Instruments – accuracy maintained in strong magnetic environments.

    4. Defense & Aerospace

    • Submarine Components – minimize magnetic signature for stealth operations.

    • Magnetic Shielding Parts – ensure equipment performance in sensitive applications.

    • Aerospace Sensors & Housings – reliable in extreme environments.

    5. Industrial & Special Equipment

    • Precision Measuring Devices – for environments where magnetic neutrality is required.

    • Medical Equipment Components – MRI-compatible structures requiring non-magnetic alloys.

    • Custom Machined Parts – for industries requiring strong, corrosion-resistant, and non-magnetic steel.

FAQ

Q1: What is N850 Nonmagnetic Steel?
A1: N850 is a high-strength austenitic stainless steel specially developed for applications requiring low magnetic permeability (µr ≤ 1.01), excellent corrosion resistance, and good toughness. It is widely used in oil & gas drilling, mining, marine, and defense industries.

Q2: What makes N850 different from 304 or 316 stainless steel?
A2: While 304/316 stainless steels can become slightly magnetic after cold working, N850 maintains stable non-magnetic properties, even after machining or forging. It also provides higher strength and better resistance to chloride-induced corrosion compared with conventional grades.

Q3: What is the standard for N850?
A5: N850 is a commercial grade name commonly used in the oil & gas industry. It does not correspond directly to ASTM/EN grade numbers, but products are usually tested and certified to ASTM A276, ASTM A479, EN 10204 3.1/3.2, and comply with API 7-1 requirements for nonmagnetic drill collars.

Q4: Can N850 be welded and machined?
A6: Yes. N850 offers good weldability (GTAW, GMAW, SMAW processes) and can be machined into complex parts. Solution annealing is recommended after welding to restore non-magnetic properties and corrosion resistance.

Q5: Why should I choose N850 for oil & gas drilling?
A8: Because it ensures accurate downhole survey readings by eliminating magnetic interference, while providing high mechanical strength and superior corrosion resistance in harsh drilling environments.

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 supports custom cutting, surface finish adjustments, and slit-to-width services for N7 nickel plates. Whether you need thick plates or ultra-thin foil, we deliver with precision.
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,     
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