We offer products with a superior level of safety and durability.

Characteristics

Society is increasingly demanding further improvements in weight reduction, durability, safety and reliability of automobiles and motorbikes.
In order to meet such demands, we offer products such as aluminum-plated steel tubes and zinc coated steel tubes, SuperDyma^® steel tubes(highly corrosion-resistant coated steel tubes) in addition to common steel and high-tensile steel tubes. We have been able to receive high acclaim from customers in various industries.

• A wide variety of steel grades for use in many applications in addition to JIS G 3445 (carbon steel tubes for machine structure).
• A flexible range of sizes can be manufactured with cold drawing facilities.
• A rigid quality control and inspection system, making use of equipment such as eddy current and ultrasonic tester.
• A steel tube development support system to make lighter products and reduce costs.

Types and Applications

Types	Applications
Automobile usage	For automobiles : Axle tubes, Tie-rods, Propeller shafts, Steering shafts, Drive shafts, Door impact beams, Shock absorbers, etc. For motorcycles : Front forks, Shock absorbers, etc.
Construction machinery usage	Frame, Pillars, etc.
Cylinders and rods usage	Steel tubes for honing-finish-type cylinders, etc.
Machine structural parts usage	Machine tool pillars and connecting members, Precision machinery components, etc.
Other	Bicycles, Furniture, etc.

Various grades, from mild steel to high-tensile steel and stainless steel can be finished by roll forming in a variety of shapes.

Characteristics

• Since stainless steel has rust resistance and excellent high temperature corrosion resistance it is mainly used in exhaust systems, fuel filler tubes, and other components of automobiles and motorcycles.
• Many different kinds of austenitic and ferritic materials are available.
• Because we are capable of manufacturing laser/TIG welded steel tubes in addition to high-frequency electric resistance welded steel tubes, extremely thin wall thicknesses as small as 0.2 mm are possible.
• We also possess polishing equipment, making it possible to provide bright surface and many other different surface conditions to suit the application.

Such tubes include general structural steel tubes used for scaffolding, piles, and other structures; and construction steel tubes that are resistant to earthquakes and have excellent weldability.

Types, Characteristics, and Applications

Carbon Steel Tubes for General Structure（JIS G 3444）

Types	Characteristics	Applications
STK290	Equivalent to SS330, and used for light structural members.	General structures, Outdoor light poles, Handrails
STK400	Same type as shape steel, sheet steel, and bar steel SS400, and used for various structural members, offering versatile range of applications. JIS A 5525, “Steel pipe piles.” Covered in JIS A 8651, “Tubular steel adjustable shores” and JIS A 8951, “Tubular steel scaffolds.”	Piles, Temporary building, Steel towers
STK490	Same type as SM490 covered in JIS G 3106, “Rolled steel for welded structures.” High-strength steel tubes for welded construction, with yield point also about 30% higher than STK400.	Buildings, Steel towers
STK500	Used often for pillars, scaffolds, etc. Covered in JIS A 8651, “Tubular steel adjustable shores” and JIS A 8951, “Tubular steel scaffolds.”	Scaffolds, Pillars, Temporary/Simple buildings
STK540	Accompanying increase in size of steel structures, established in 1974 as even stronger high-strength steel tubes for welded construction.	Structures, Steel towers

Carbon Steel Tubes for Building Structure（JIS G 3475）

Types	Characteristics	Applications
STKN400W	Has excellent weldability as a result of carbon equivalent restrictions.	Members that are welded and used within elastic range
STKN400B	Has excellent weldability as a result of carbon equivalent restrictions.	Main structural members for earthquake resistance
STKN490B	Secures plastic deformation performance during an earthquake by strict controlled mechanical properties.

Carbon Steel Pipes for Ordinary Piping have versatile uses, including piping for steam, water, oil, gas, and air.

Types, Characteristics, and Applications

Carbon Steel Pipes for Ordinary Piping / Pressure Service（JIS G 3452）

Types	Characteristics	Applications
SGP	Used for relatively low-pressure piping.	Piping for steam, water, oil, gas, air, etc.

Carbon Steel Pipes for Pressure Service / Pressure Service（JIS G 3454）

Types	Characteristics	Applications
STPG	Used for relatively high-pressure piping.	Pressure piping for use at or below approx. 350°C