We provide custom products that fully cater to customers' requests.
Our special steel materials are manufactured to be completely customized. We select the dimensions, surface roughness, and other characteristics in accordance with customers' requests.
In addition, based on the knowhow we have accumulated through our experience, we can propose solutions to your issues that use new types of steels or treatment methods.
Our strengths in special steel materials
We hold the top share in Japan for engine valve heat-resistant steel and soft-magnetic stainless steel. We also sell our steel widely overseas. In particular, in 1960 Tohoku Steel became the first company in the world to develop soft-magnetic stainless steel. We carry a wide lineup for various usages to meet customer needs. We promote labor-saving automated operation for delivery and production at our plants in order to achieve shorter delivery times and appropriate costs.
Testing / Inspection system
We were the first special steel manufacturer in Japan to receive ISO/TS16949 certification (which is superseded by IATF) to manufacture soft-magnetic stainless steel for automobiles (cold drawn bars and drawn wires) and heat-resistant steel for automobiles (cold drawn bars and drawn bars). In this way, we maintain a quality assurance system that gives our customers a sense of security.
To test and inspect steel materials, we use strictly calibrated testing and inspection equipment in order to confirm that product characteristics (e.g., hardness, tension, and magnetic properties) meet customers' requests.
We use eddy current and ultrasonic testing methods to inspect 100% of many of our products so as to ensure the soundness of both their surfaces and internal components.
To test and inspect steel materials, we use strictly calibrated testing and inspection equipment in order to confirm that product characteristics (e.g., hardness, tension, and magnetic properties) meet customers' requests.
We use eddy current and ultrasonic testing methods to inspect 100% of many of our products so as to ensure the soundness of both their surfaces and internal components.
Product Information
Special steel materials
| Classification | Steel type | Features | Examples of product usage | Usage |
|---|---|---|---|---|
| Heat-resistant steel | <Martensite-based> SUH11, SUH3, and others <Austenite-based> SUH35, 21-2N, and others <Alloy type> NCF751 NCF80A |
We have the top share in Japan for engine valve heat-resistant steel. We manufacture various types of heat-resistant steels. |  |
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| Stainless steel | SUS310S, SUS630, SUS329J1, K-SD45, and others |
Special stainless steel that has the requested characteristics (heat resistance, corrosion resistance, high strength, etc.) |  |
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Magnetic materials
| Classification | Steel type | Features | Examples of product usage | Usage |
|---|---|---|---|---|
| Electromagnetic stainless steel | K-M31, K-M35FL, K-M38, K-M45, K-M60, and others |
Since the 1960 launch of K-M31, the world's first soft-magnetic stainless steel, we have maintained the No. 1 share in Japan. We have a wide lineup to meet various needs. |  |
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| Non-Pb TICS free-cutting soft-magnetic stainless steel | K-M38CS, etc. | Quite different from Pb free-cutting and MnS free-cutting steels. A completely new type of free-cutting steel: TICS It received the 21st Century Invention Award. |
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| High-hardness, soft-magnetic stainless steel | K-M57 | Soft-magnetic stainless steel is commonly understood to be a mechanically soft material. Defying such a conception, this is a precipitation-hardened ferrite-based soft-magnetic stainless steel that we were the first in the world to mass produce. |  |
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| Flux density soft-magnetic material | ME1F (Free-cutting pure iron) MES2CS (2.2% silicon TICS free-cutting steel) MES3F (3% silicon free-cutting steel) K-MP11E (Permendur) |
We provide pure iron and silicon iron free-cutting steels with superior magnetic properties. We have distinct pure iron-based magnetic materials, such as highly saturated magnetic flux density materials and highly permeable magnetic materials. |  |
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| Permalloy | K-MH60(PB), K-MH50(PC), and others |
Alloys made mainly of iron and nickel with the best soft magnetism. They are essential materials in the electronics field; applications include magnetic heads, iron cores, shields, sensors, and more. |  |
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Alloys
| Classification | Steel type | Features | Examples of product usage | Usage |
|---|---|---|---|---|
| Low thermal expansion alloy | K-EL70 (Invar) K-EL50 (Super invar) K-ET52 (Kovar) |
Iron-nickel alloys containing around 36% nickel provide an extremely small thermal expansion coefficient at near room temperature due to magnetic transformation. They are an essential material for precision measurement equipment, precision machine parts, and so forth. Kovar's thermal expansion coefficient is adjusted to be equivalent to that of ceramics, and it is used for sealing. |  |
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| Free-cutting Invar / Kovar | K-EL70CS K-EL50CS K-ET52CS |
Our newly invented TICS realizes free-cutting of difficult-to-cut Fe-Ni alloys. |
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