State-of-the-art high precision technology realizes high yields.

We manufacture processed materials from the phase of melting, including material development. We also process parts using these materials. In particular, we pursue cost minimization through integrated manufacturing, which includes processing of precision rough shape materials by cold forging using difficult-to-process materials from cutting to heat treatment. We provide high quality, high accuracy parts to satisfy our customers.

Our strengths in precision processed products

With our processing and development technologies developed from our expertise in special steel manufacturing and material forging with reference to the shape of each part before cutting, we can significantly reduce the total cost (by approx. 40–60% on average) by implementing NNS (Near Net Shape). In addition, to provide high quality products, we implement a strict quality control system, including dimension and appearance checks through image analysis inspections that employ cameras.

Process flow / Examples of product processing / Main equipment

Product Information

Cold- / Warm-Forged NNS products

Material

Manufacturing method

Features

Examples of product usage

Usage

SUSXM7

Soft-magnetic material
Cold die steel

After NNS forging with 400-t and 600-t transfer presses, we perform vacuum and controlled atmospheric heat treatment.

We perform Near Net Shaping (NNS) with cold/warm multistage pressing to reduce total costs.

Fuel injection parts

High pressure pump parts

EPS parts

 

Product example 1

Cold- / Warm-forged & Machined products

Material

Manufacturing method

Features

Examples of product usage

Usage

SUSXM7

Soft-magnetic material
Cold die steel

We perform machining with the aforementioned method plus CNC lathe, etc.

To maximize the material properties, we perform NNS with multistage pressing along with heat treatment and cutting.

Fuel injection parts
 

High pressure pump parts
 

EPS parts

 

Product example 2

Product example 3

Machined products

Material

Manufacturing method

Features

Examples of product usage

Usage

High Ni-based SUS

Co-based heat-resistant alloy
Ni, Ti alloys

After rough processing of round, square, or profile materials, we perform vacuum heat treatment. Important parts are precision finished.

Cutting process for difficult-to-cut materials
- Cutting of high-hardness materials (HRC 40 to 52)
- Cutting of low-expansion materials
- We can cut round bars made of low-expansion materials as well as pipe materials.

 

Ultrasonic motor parts

Protective cover parts

Sensor parts

Optical Denso parts

SUS316L

SUS316L clean materials

After rough processing of round, square, or profile materials, we perform vacuum heat treatment. Important parts are precision finished.

Cutting of high cleanliness materials (stainless steel with a low level of inclusions or impurities) with high complexity and precision requirements
- High-hardness cutting via special plastic forming
- Mirror-like finishing of portions that make contact with gas or liquid (surface roughness: 0.7 S or lower)

Semiconductor parts

Device parts

Valve parts for medical devices

Processed composite products

Material

Manufacturing method

Features

Examples of product usage

Usage

Ni Permalloy
Highly saturated magnetic flux density material

Electromagnetic stainless steel

We use closed die forged products and plate materials that are punched, bent, and etched after vacuum heat treatment. Special processing is also performed, such as laminating or welding.

We use our special processing technology for processed composite products.
- Plate press forming
- Etching
- Laminating

Solenoid valve parts

Linear guides

Electromagnetic motor iron cores

Resolver cores

Contact Us

Tohoku Steel Co., Ltd.
23 Nishigaoka, Murata, Murata-machi, Shibata-gun, Miyagi,
989-1393 Japan

On special steel materials and precision processing products (Please inquire to our office nearest your area.)

Contact Phone FAX
Tokyo Office +81-3-3270-1851 +81-3-5255-6775
Nagoya Office +81-52-269-3626 +81-52-269-3632
Sendai Office +81-22-248-3151 +81-22-304-1021

On heat treatment

Contact Phone FAX
Heat treatment plant +81-224-83-5606 +81-224-82-1023

Special alloys / Industrial instrumentation

Contact Phone FAX
Research & Development Department
Development Sales Team
+81-224-51-8223 +81-224-82-1021

Company Information / Recruitment / IR, etc.

Contact Phone FAX
General Affairs Team, Operations Department +81-224-82-1010 +81-224-82-1020