Carbon steel tubes (black)
Carbon steel tubes(plating)
Carbon steel tubes
Carbon steel tubes manufactured at our Shimizu, Sakai and Miyakonojo factories is used in farming and gardening greenhouses and temporary construction site, etc. black products and pre-plated (Hot-dip zinc) products are available.
Civil engineering, architecture, steel tower, scaffold, column, furniture and other structure.
|Manufacturing facilities||Authentication number||Authentication date||Product name (JIS number)|
|Shimizu factory||QA0508007||May 20, 2008|| Carbon steel tubes for general structure
(JIS G 3444)
Excellent corrosion resistance
Even if the zinc coating is broken by partly exposing the iron base, the surrounding area is protected from rust by the sacrificial anticorrosion effect of zinc until the area reaches a certain size.
Beautifully finished surface
Zinc is excellent in coating adhesiveness and uniformity. The lubricating effect of zinc makes it easy to mold and provides graceful finished surface.
|Type of coating||Non-alloyed coating||Alloyed coating|
|Coating mass symbol||Z12||Z18||Z20||Z22||Z25||Z27||F12||F18|
|MInimum average coating mass at triple spots||120||180||200||220||250||275||120||180|
|Minimum coating mass at single spot||102||153||170||187||213||234||102||153|
"Surfcoat," a eco- and people-friendly coating agent having surprising effects for white rust prevention on pre-plating products (Carbon steel tubes for general structure) does not come under by the poisonous and deleterious substances control law as it contains no heavy metals such as chromium. It receives a favorable reputation for its amazing coating effect on pre-plating steel pipe used for agricultural facilities in high-temperature and humid environment.
"Surfcoat" has also shown good results in laboratory hot water immersion tests and resistance test in humidity of 98% or over, while it has also shown excellent results in long-term field exposure tests.
Long-term exposure test results
|10 days later||3 months later||6 months later||12 months later|
|Other companies' rust prevention products||
High-strength steel tubes (EchoStar) made of fine grained hot rolled steel sheet (NFG)
of which Nakayama Steel Works, Ltd. succeeded in industrialized production for the first time in the world,
are manufactured at three factories in Sakai, Shimizu and Miyakonojo.
As EchoStar has superior strength, fatigue characteristics, high toughness, and weldability compared to conventional products, it has high demand in various fields.
Higher strength and performance than conventional products
It is superior to conventional products (STK 500) in terms of tensile strength, yield point or bearing capacity, toughness in low temperature environment, workability and weldability.
|Classification||Tensile strength (N/mm2)||Yield point or proof stress (N/mm2)||Elongation(％)|
|EcoStar 700N||700 min.||570 min.||10 min.|
|STK500||500 min.||355 min.||8 min. (※)|
Excellent corrosion resistance
Zinc plating (Staging Z 27), which has excellent resistance to corrosion, is applied on the front and back surfaces, and if necessary, "surfcoat" which is effective in preventing white rust, is applied in pursuit of perfect quality.
Quality characteristics of fine grain hot-rolled steel sheet (NFG)
Nakayama steel's fine grained hot steel sheet (NFG) has excellent quality characteristics due to its extremely fine ferrite grain size of approximately 1/3 or less compared to conventional hot steel sheets. Furthermore, its manufacuturing technology was awarded the Okochi Memorial Technology Award in 2003.
EchoStar has been adopted as a component of newly developed composite floor slab for bridges due to its superior quality characteristics and unique connection methods.
| Unit mass
| Sectional area
| Gemetric moment of inertia
| Section modulus
| Radius of gyration of cross-section
|Outside diameter||Wall thickness|