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The Super Hot Column is a hot formed structural hollow section manufactured by Nakajima Steel Pipe

The Super Hot Column is a hot formed structural hollow section that is formed after the uniform heating process. The additional processing eliminates the negative impact of strain-hardening and produces a homogeneous microstructure throughout the entire section. This provides material properties that equal or exceed SN grade products.

The section is highly regarded for its performance and superior resistance to earthquakes. It has been certified as a designated construction material by the Ministry of Land, Infrastructure, Transport and Tourism of Japan and was acknowledged with the Director-General’s Award from the Science and Technology Agency of Japan.

CE Mark: Displayed on products that comply with standards set by all EU member countries

Super Hot Column—the International Mainstream

The Super Hot Column is in compliance with international standards, including the CE Mark, European safety standard. The company owns patents in Japan as well as in Europe and the United States, and the product is highly regarded in global markets for its overall quality.

Super Hot Column Is Superior in Price as well as Overall Performance

  Super Hot Column Cold formed structural hollow sections Four-sided box column
Price Good Good Fair
Quality Excellent Good Fair
Delivery Time Good Good Fair

Compatible with Integrated Structural Calculation Software

The Super Hot Column is compatible with major integrated structural calculation software and facilitates data input.

NTT Data: SEIN La Crea
Kozo System: BUS-5
Tokyo Denco: ACE compatible
Union System: Super Build/SS2
Kozo Soft: BUILD integrated

Constructing Earthquake-resistant Buildings with the Super Hot Column

New earthquake-resistant design methods now being used are premised on absorbing the energy of an earthquake by distorting the frame of the building. This requires plastic deformation capacity in its parts and proof stress in the joints to ensure maximum performance of each component. Nakajima Steel Pipe’s Super Hot Column is a unique hot formed structural hollow section that retains resilience as an essential metallic property of steel by adhering to the hot formed process, the basic manufacturing technology for steel.

Super Hot Column—Characteristics

  • Excellent elongation capacity
  • High buckling strength
  • Little residual stress
  • Uniform hardness throughout the section

The Super Hot Column holds the key to protecting lives, livelihoods and societies against the next anticipated major earthquake.

Jumbo Size Offers Significantly Reduced Costs Compared to the Welded Box Column

The Super Hot Column SHCK, featuring constant design strength (F value) that does not decline even at a sheet thickness exceeding 40 mm, offers significant reduced costs compared to welded box columns.

Super Hot Column—Available Sizes

Outside diameter (D): 200–800 mm

Sheet thickness (t): 6–70 mm

Ideal Material with Uniform Hardness Distribution

The Super Hot Column, formed and finished in the austenitic stage, offers excellent plastic deformation capacity and weldability. Also, it has a homogeneous microstructure throughout the entire section with little residual stress even at the corner sections.

Distribution Maps of Vickers Hardness Values in the Corners (In-house Comparison)

Distribution Maps of Vickers Hardness Values in the Corners (In-house Comparison)

Hot Formed Structural Hollow Section EN10210

Hot formed sections exhibit a higher load carrying capacity in compression (i.e., as struts) than cold formed sections of the same size, thickness, and design slenderness.

There is an increase of up to 26% in load carrying capacity with the hot formed section.

1. Mechanical Properties
Steel grade Thickness
(mm)
Yield strength
(N/mm²)
Tensile strength
(N/mm²)
Elongation
(%)
Test temperature
(°C)
Impact value
(J)
S235JRH 6≤t≤16 235≤ 360–510 26≤ 20 27≤
16<t≤40 225≤ 26≤
40<t≤63 215≤ 25≤
63<t≤70 215≤ 24≤
S275J0H 6≤t≤16 275≤ 410–560 23≤ 0 27≤
16<t≤40 265≤ 23≤
40<t≤63 255≤ 22≤
63<t≤70 245≤ 21≤
S275J2H 6≤t≤16 275≤ 410–560 23≤ -20 27≤
16<t≤40 265≤ 23≤
40<t≤63 255≤ 22≤
63<t≤70 245≤ 21≤
S355J0H 6≤t≤16 355≤ 470–630 22≤ 0 27≤
16<t≤40 345≤ 22≤
40<t≤63 335≤ 21≤
63<t≤70 325≤ 20≤
S355J2H 6≤t≤16 355≤ 470–630 22≤ -20 27≤
16<t≤40 345≤ 22≤
40<t≤63 335≤ 21≤
63<t≤70 325≤ 20≤
S355K2H 6≤t≤16 355≤ 470–630 22≤ -20 40≤
16<t≤40 345≤ 22≤
40<t≤63 335≤ 21≤
63<t≤70 325≤ 20≤
2. Chemical Composition

Unit: %

Steel grade Thickness
(mm)
C Si Mn P S N CEV
S235JRH 6≤t≤16 ≤0.17 - ≤1.40 ≤0.040 ≤0.040 ≤0.009 ≤0.37
16<t≤40 ≤0.39
40<t≤65 ≤0.20 ≤0.41
65<t≤70 ≤0.44
S275J0H 6≤t≤16 ≤0.20 - ≤1.50 ≤0.035 ≤0.035 ≤0.009 ≤0.41
16<t≤40 ≤0.43
40<t≤65 ≤0.22 ≤0.45
65<t≤70 ≤0.48
S275J2H 6≤t≤16 ≤0.20 - ≤1.50 ≤0.030 ≤0.030 - ≤0.41
16<t≤40 ≤0.43
40<t≤65 ≤0.22 ≤0.45
65<t≤70 ≤0.48
S355J0H 6≤t≤16 ≤0.22 ≤0.55 ≤1.60 ≤0.035 ≤0.035 ≤0.009 ≤0.45
16<t≤40 ≤0.47
40<t≤65 ≤0.50
65<t≤70 ≤0.53
S355J2H 6≤t≤16 ≤0.22 ≤0.55 ≤1.60 ≤0.030 ≤0.030 - ≤0.45
16<t≤40 ≤0.47
40<t≤65 ≤0.50
65<t≤70 ≤0.53
S355K2H 6≤t≤16 ≤0.22 ≤0.55 ≤1.60 ≤0.030 ≤0.030 - ≤0.45
16<t≤40 ≤0.47
40<t≤65 ≤0.50
65<t≤70 ≤0.53