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Non-magnetic Stainless Steels

TOKKIN 305M, TNM-1, SUS316L

Overview

SUS304, a representative austenitic stainless steel, is nonmagnetic in the solution heat-treated state, but it becomes magnetic due to martensitic transformation after cold working.Therefore, there were challenges such as keeping the processing rate low and sacrificing strength in order to maintain non-magnetic properties.
As Non-magnetic stainless steels are grades that are adjusted so that martensite is not induced (or is not easily induced) by cold working, it can maintain its nonmagnetic properties even after machining. We will propose steel grades according to your usage conditions, such as processing method and required non-magnetic level.

Examples of Applications

Electromagnetic Shielding, Vibration Motors, Camera Modules, FPCs, Communication Equipment Components, Medical Devices, Indwelling Needles

Product Shapes

Product Size Range

Thickness : 0.010mm-2.0mm *Availability may vary by steel grade.

Width          : 3.0mm-300mm *Contact Sales if your desired values is over 300mm.

Length        : COIL or SHEET less than L2000mm

Features

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Type Grade Features High Strength Non-Magnetic Wokability Corrosion Resistance
Non-Magnetic Stainless Steel TNM-1™
[TOKKIN Original Product]
A steel grade whose composition has been adjusted to maintain nonmagnetic properties even at extremely high working rates. Extremely high strength of 500 HV can be obtained, making it ideal for applications that require high non-magnetic properties and high springiness. Soft materials can also be drawn. S S A A
TOKKIN 305M
[TOKKIN Original Product]
This is a steel grade in which the austenite phase is stabilized by increasing the content of nickel, manganese, chromium, etc. in SUS304 (18Cr-8Ni), and is hardly magnetized even after cold rolling.
TOKKIN 305M is more stable than general SUS305 because these elements are adjusted to a higher level within the range of JIS standard SUS305.
It also has excellent workability and corrosion resistance due to its high nickel content.
A* A* A A
SUS316L Among general-purpose stainless steels, it is often used for applications that require non-magnetic properties because of its slow martensitic transformation during processing. However, it tend to gain magnetism (measured as “magnetic permeability”) when they are work-hardened (machined, formed, stamped, bent, etc.).
Its high nickel content and addition of molybdenum provide excellent workability and corrosion resistance.
B* A* A S

*Please note that weak magnetism occurs as the processing rate increases.

Chemical Compositions

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Type Grade C Si Mn P S Cr Ni Mo Fe
Non-Magnetic Stainless Steel TOKKIN 305M 0.07-0.09 0.60-1.00 1.40-1.80 0.045 max 0.030
max
18.00-19.00 12.00-13.00 - Bal.
SUS305
(JIS)
0.12
max
1.00
max
2.00
max
0.045 max 0.030
max
17.00-19.00 10.50-13.00 - Bal.
SUS316L 0.030
max
1.00
max
2.00
max
0.045 max 0.030
max
16.00-18.00 12.00-15.00 2.00-3.00 Bal.

Mechanical Properties



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Typical Value  Before Processing (Skin-passed material)  Maximum Strength
Permeability
[μ max]
Hardness
[HV]
Tensile Strength
[MPa]
Yield Stress
[MPa]
Elongation
[%]
Permeability
[μ max]
Hardness
[HV]
Tensile Strength
[MPa]
Yield Stress
[MPa]
Elongation
[%]
 TNM-1™ 1.003   260  920  570 48  1.003  510  1730 1700   0.1
 TOKKIN 305M 1.004   190  700  420 50  Over 1.2  400  1220 1200  0.3
 SUS316L 1.004  185  660 420 50   Over 1.2  380  1200 1180   0.3
 

Relationship among Magnetic Permeability, Workability, and Hardness

Relationship among Magnetic Permeability, Workability, and Hardness

Related Pages

Stainless Steels Foils

We can make it to foils (less than 0.10 mm thick) in all the stainless steels we manufacture.

We welcome your questions and inquiries regarding materials.