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Non-magnetic stainless steel (305M)

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Main applications

Communication equipment parts, medical instruments, and motor parts (coin type)


*Due to its non-magnetic properties, SUS305M is used in electronic device component applications where magnetism is undesirable.


Product size range

Thickness : 0.010~1.5mm

Width : 3~300mm

Manufacturing sites

JAPAN


  • Product overview Features
  • Standards & Chemical composition
  • Tokkin Advantages
  • Physical Properties Mechanical properties

Product Overview

SUS305 is generally referred to as non-magnetic stainless steel.

The common austenitic stainless steel SUS304 (18Cr8Ni) undergoes a martensitic transformation that endows it with magnetic properties (i.e. it attaches to magnets easily) when cold worked. Since SUS305 (which is also an austenitic stainless steel) has a high nickel (Ni) content that produces a stable austenite phase, it can maintain a state in which hardly any martensite is induced after cold rolling.

Their increased nickel content allows SUS305 materials to maintain non-magnetic properties after processing. The SUS305M grade that we produce has a nickel content that is toward the higher side of the JIS standard, and therefore provides higher non-magnetic properties.

Its high nickel content also gives SUS305M excellent workability and corrosion resistance.

 

Features

We manufacture SUS305M, which has a high nickel content that gives it stronger non-magnetic properties than the regular non-magnetic stainless steel grade SUS305.

Standard

TOKKIN
Designation

International
Standard

USA

Europe

UK

Germany

ISO

UNS

AISI

EN

BS

DIN

305M

8

S30500

305

1.4303

305S19

X5CrNi18 12

 

TOKKIN 
Designation

International 
Standard

France

Russia

China

Japan

ISO

NF

ΓOCT

GB

JIS

305M

8

Z8CN18-12

06X18H11

1Cr18Ni12

SUS305

 

 

Chemical composition 

TOKKIN
Designation

Chemical composition(%)

C

Si

Mn

P

S

Cr

Ni

305M

0.07~0.09

0.60~1.00

1.40~1.80

≦0.045

≦0.030

18.00~19.00

12.00~13.00

SUS305

(JIS)

≦0.12

≦1.00

≦2.00

≦0.045

≦0.030

17.00~19.00

10.50~13.00

Tokkin Advantages

 High quality and reliability

Our ability to produce thickness tolerances that are impossible to achieve using regular materials allows us to manufacture products that provide stable strength and part dimensions.

Moreover, we can reduce variation between lots and ensure a high degree of reliability through careful management of manufacturing processes.

 

 High non-magnetic

305M is produced for non-magnetic usages. Because it contains Ni and Mn in greater quantities than SUS305(JIS), the stability is better than SUS305(JIS).

 

 Ultrathin foils

We can manufacture ultra thin sheets of 0.010 to 0.099 mm.

 

 Flexible, small-lot production

We can manufacture standard lots weighing 300 kg,

and are also happy to consider smaller lots upon consultation.

(Requests for small-lot orders will be dealt with on a case-by-case basis.)

 

 Ability to adjust materials to desired hardness

We make products to order, and can adjust hardness as required.

 

 Select your surface finish

By changing the roll used in the rolling process, we can offer a bright or dull finish.

If required we can also provide a hairline finish (outsourced).

Physical Properties

Grade

Density

g/cm3

Specific heat

J (㎏·K)

Electrical resistance

μΩ·㎝

Young's modulus

N/mm2

Coefficient of thermal expansion

(20°C–100°C)

Thermal conductivity

W/(m·K)

305M

7.93

502  

72

193,000

17.3 x 10-6/K

16.3 (100°C)

 

Mechanical Properties

Hardness

HV

Tensile strength

N/mm2

Yield strength

N/mm2

Elongation

%

Erichsen value

Bendability

140

560

215

62

11.8

180°, good adhesion

 

Cold Rolling, Hardness, and Permeability

Austenitic stainless steels such as the common SUS304 grade are non-magnetic in a solidified (annealed) state, but demonstrate magnetism after cold rolling.

To enable SUS305M to take on stronger non-magnetic properties when cold worked than regular SUS305 as stipulated in JIS standards, the content of nickel and other components has been adjusted.

The charts below are correlation graphs that compare reduction rate and hardness against permeability for SUS304, SUS305, and SUS305M.

It can be seen that Tokkin's SUS305M grade demonstrates stronger non-magnetic properties compared to SUS304 and SUS305.

Reduction rate and permeability/hardness and permeability

Correlation Graphs of Reduction Rate vs. Permeability (Left) and Hardness vs. Permeability (Right)

 

 

Related products
Austenitic stainless steels for springs (SUS301/304/304L)

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Introducing the popular austenitic stainless steel grade SUS304.

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