Electromagnetic Stainless Steel (TDS-1)


HDD cover, Shield case, Connectors, Digitizer, Condenser frames, Sensor frames, parts for SMD

Thickness: 0.030 to 1.0mm
Width: 3 to 300mm

JAPAN, CHINA
Product overview
TDS‑1 is a “High Functional Ferrite Stainless Steel” with good properties of “Strength”,
“Corrosion resistance”, and “Magnetism”.
Compared with SUS430, TDS-1 has higher magnetic flux density and lower coercive force. Therefore the properties of magnitizable, degauss, and magnetic shielding are good.
Features
■ Electromagnetic Stainless Steel
It can be used as an electromagnetic stainless steel by magnetic annealing.
■ The good corrosion resistance
TDS-1 has a better corrosion resistance than that of SUS430.
■ Stabilize the price
The biggest advantage of TDS‑1 is the stable cost. The content of Ni is only 1% of all composition.
Therefore the cost is not affected by the fluctuation in Ni price.
■ The resistance same as other materials
The conductivity is nearly the same as that of 42 Ni, in spite of it has half thermal expansion coefficient of 42 Ni. The cost may be halved.
■ VA proposals
TDS‑1 can be replaced from 42Ni, silicon steel, SUY, and Permalloy, etc.
Chemical composition
TOKKIN Designation |
Chemical composition(%) |
||||||||
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Mo |
その他 |
|
TDS-1 |
0.07 |
1.90 |
0.60 |
0.02 |
0.002 |
16.30 |
1.00 |
- |
- |
Advantages
■ Cost reduction by the change from 42 alloys
The coefficient of thermal expansion of TDS-1(11.3×10-6/K) is about half that of 42 alloys(6.8×10-6/K).
The content of Ni is only 1% of all composition. Therefore the cost is not affected by the fluctuation in Ni price.
■ Custom-made thickness
Tokkin can provide micron-level customization of thickness
■ Made-to-order product that can be manufactured in small lots
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.)
■ Ultrathin foils
We can manufacture ultra thin sheets of 0.010 to 0.099 mm.
■ 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/c㎥ |
Thermal 10-6/K |
Electrical μΩ・cm |
Young's modulus N/m㎥ |
Hardness HV |
TDS-1 |
7.73 |
11.3 |
70 |
206,000 |
190~330 |
42 alloy |
8.15 |
6.8 |
70 |
145,000 |
125~230 |
Invar 36 alloy |
8.21 |
2 or less |
80 |
142,200 |
120~220 |
Mechanical Properties
Corrosion resistance test
鋼種 |
Salt g/l |
Quantity
ml/h/80cm2 |
Temperature
℃ |
Time
days |
TDS-1 |
50 |
1.5 |
35 |
24 |
Note: TDS-1 has a better corrosion resistance than that of SUS430.
Result of magnetic measurement applied for a circular sample
状態 |
Flux density 10-4 ・ T |
Residual 10-4 ・ T |
Coercive A/m |
Maximum μmax |
|||||
B1 |
B2 |
B3 |
B5 |
B25 |
B30 |
Br |
Hc |
|
|
Before annealing |
60 |
120 |
180 |
320 |
5140 |
6020 |
4040 |
1122.1 |
210(2Oe) |
After magnetic annealing |
450 |
2730 |
4590 |
6600 |
11160 |
11520 |
6390 |
143.2 |
1522 (2.8Oe) |
Note: Thickness of sample material : 0.30mm
If thickness is thin(0.10mm or less), the effect of magnetic annealing may not be sufficient.