Corrosion resistance
In metals, corrosion resistance refers to the ability to resist rust and other forms of chemical degradation.
As rust progresses, the metal loses its strength and can no longer perform its intended function
To prevent rust, it is important not only to create an environment that minimizes corrosion, but also to select materials that are inherently resistant to rust.
Characteristics
As the name suggests, stainless steel is resistant to rust.
On the other hand, its wear resistance is inferior to that of iron-based steel.
Among stainless steels, there are austenitic stainless steels with excellent corrosion resistance and martensitic stainless steels with excellent wear resistance.
TNK handles SUS303, SUS304 and SUS316, as well as TNK original materials 15MH.
TNK can also select low-carbon materials tailored to the specific requirements of your application. TNK supports you from small lot prototyping during early development to cost optimization in mass production. Please feel free to contact us for collaboration.
Corrosion and wear resistance
The graph above shows the relationship between corrosion resistance and wear resistance for each material.
Corrosion resistance and wear resistance often exist in a trade-off relationship, making it difficult to achieve both properties simultaneously.
Alloying elements that increase the hardness of metals often reduce their corrosion resistance, so it’s important to select materials that strike a balance between the required properties for each application.
Mechanical and physical properties (room temperature)
| Material | 硬度 HV |
density g / cm3 |
Modulus of Elasticity × 104N/mm2 |
specific heat J/(g・k) |
Thermal conductivity W/(m・k) |
Coefficient of thermal expansion × 10-6/ ℃ |
specific electrical resistivity μΩ cm |
magnetic |
| SUS303 | 200 or less | 8.03 | 19.30 | 0.50 | 16.3 | 17.3 | 72 | Nonmagnetic |
| SUS304 | 200 or less | 7.93 | 19.30 | 0.59 | 16.3 | 16.1 | 72 | Nonmagnetic |
| SUS316 | 200 or less | 8.03 | 19.30 | 0.50 | 15.2 | 17.3 | 74 | Nonmagnetic |
| SUS410 | 400 ~ 600 | 7.75 | 20.20 | 0.46 | 23.8 | 9.9 | 57 | Strong magnetism |
| SUS420J2 | 500 ~ 700 | 7.75 | 20.60 | 0.46 | 25.0 | 10.4 | 56 | Strong magnetism |
| SUS430 | 180 | 7.75 | 20.00 | 0.46 | 25.6 | 10.4 | 60 | Strong magnetism |
| SUS440C | 600 ~ 800 | 7.80 | 22.05 | 0.46 | 24.2 | 10.6 | 60 | Strong magnetism |
| SUH660 | - | 7.94 | 20.10 | 0.46 | 15.0 | 16.8 | 9 | Nonmagnetic |
| 15MH | 500 | 7.75 | 19.50 | 0.46 | 14.7 | 13.1 | 70 | Nonmagnetic |
| SUJ2 | 750 | 7.82 | 20.80 | 0.46 | 46.0 | 12.5 | - | Strong magnetism |
| SK105(SK3) | - | 7.75 | - | 0.46 | 45.2 | 11.3 | - | Strong magnetism |
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Other materials
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MATERIAL
Heat resistance
Heat-resistant
Heat-resistant materials include stainless steel, heat-resistant steel, ceramics, etc. Ceramics have high heat resistance and abrasion resistance, but are expensive and have poor impact resistance. Please select the appropriate material depending on the application.
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MATERIAL
Non magnetic
Nonmagnetic
Austenitic stainless steel is non-magnetic, but it can become magnetic due to work hardening. It is very difficult to achieve both non-magnetic and wear resistance at the same time. There are many types of stainless steel, so please choose the appropriate material.
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MATERIAL
original
Original material
TNK has developed two proprietary materials: 15MH — a non-magnetic stainless steel that offers high hardness, excellent wear resistance, and outstanding corrosion resistance. KWS440MA — a martensitic alloy that delivers similar performance to SUS4C, with enhanced sliding properties and reduced cost. Its wear resistance can be further improved through heat treatment.