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Tohoku Steel Co., Ltd.
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Special Steels

Top share in Japan for "Engine valve heat-resistant steel" and "Soft-magnetic stainless steel"

  • Through an industrial-academic alliance with Tohoku University's Institute for Materials Research (IMR), we have been developing new high performance materials.
  • We provide integrated engineering service, including manufacturing of steel materials, forging, cutting and heat-treatment.
  • About soft-magnetic stainless steel-ground bars and drawn wire for automotive industry, our quality assurance system is based on the quality management system of ISO/TS16949.

New Product

Classification Steel Name Features Applied Product Example Usage
Pb free TICS free-cutting soft-magnetic stainless steel

K-M35CS
K-M33CS
K-M41CS
Quite different from Pb free-cutting and MnS free-cutting steels,
TICS offers a completely new type of free cutting steel.
Received the 21st Century Invention Award.
Product
Injector parts
General soft-magnetic valve parts
Magnetometric sensor parts
High hardness soft-magnetic stainless steel

K-M57 Soft-magnetic stainless steel is commonly known as a mechanically soft material. The first precipitation hardened soft-magnetic stainless steel.
Product
Injector parts
General soft-magnetic valve parts
Free-cutting invar / kovar

K-EL70CS
K-EL50CS
K-ET52CS
Fe-Ni alloy steel can now be free cut thanks to the invention of TICS technology.
Product
Optical communication parts
Aligner parts

Special Steels

Classification Steel Name Features Applied Product Example Usage
Heat-resistant

<Martensite type>
SUH1, SUH3, etc.
<Austenite type>
SUH35, 21-2N, etc.
<Alloy type>
Inconel751
Nimonic80A, etc.
These steels hold the largest domestic share of the engine valve heat-resistant steel.
Product
Suction valve
Exhaust valve
Stainless steel SUS310S
SUS630
SUS329J1
K-SD45
Other
Various types of special stainless steel with heat resistance, corrosion resistance, and high strength.
Product
EGR valve
Turbo shaft

Magnetic materials

Classification Steel Name Features Applied Product Example Usage
Soft-magnetic stainless steel

K-M31
K-M35FL
K-M38
K-M45
K-M60
Other
A wide line-up that respond to various needs. K-M31 is the world's first soft-magnetic stainless steel.
Product
Injector parts
General soft-magnetic valve parts
Magnetometric sensor parts
High permeability magnetic material

Free-cutting pure iron (ME1F)
2.2% silicon TICS free cutting steel (MES2CS)
3% silicon free cutting steel (MES3F)
Permendur
(K-MP11E)
Free-cutting silicon steels have remarkable magnetic properties. High saturated magnetic flux density material, highly-permeable magnetic material, etc. 
Product
Relay components
soft-magnetic cores
Motor parts
Sensor parts
Permalloy PB(K-MH60)
PC(K-MH50)
Other
Iron-Nickel alloys with the most remarkable soft-magnetic properties. This material is used for magnetic heads, iron cores, shields, sensors, and more.
Product
Armature
Sensor cores
Magnetic shields

Alloys

Classification Steel Name Features Applied Product Example Usage
Low thermal expansion alloy

Invar (K-EL70)
Super invar (K-EL50)
Kovar (K-ET52)
Iron-36%Nickel alloys provides an extremely small thermal expansion coefficient at room temperature. It is an essential material for precision measurement equipment, precision machine parts, etc. Kovar is adjusted its thermal expansion coefficient equivalent to that of ceramics, and is used for sealing.
Product
Optical communication parts
Aligner parts
Precision measurement equipment
Precision processing machinery

Queries / Orders

Contact us regarding our steel materials at the following numbers.
Tokyo Office Phone: +81-3-3270-1851  Fax: +81-3-5255-6775
Nagoya Office Phone: +81-52-221-9381  Fax: +81-52-219-1681
Osaka Office Phone: +81-6-6202-5465  Fax: +81-6-6233-2307
Sendai Office Phone: +81-22-248-3151  Fax: +81-22-304-1021
Go here to contact us via email.



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