JIS G3466 SS400 STKR400 Galvanized Square Tube | Structural Steel Hollow Section
| Item | Specification |
| Product | Galvanized Square Tube |
| Standard | JIS G3466 Galvanized Square Tube |
| Grades | SS400 / STKR400 |
| Shape | Square Hollow Section (SHS) |
| Material | Carbon Structural Steel |
| Manufacturing | Welded / Cold-Formed |
| Galvanizing | Hot-Dip Galvanized |
| Zinc Coating | Customized |
| Outer Dimensions | Customized |
| Wall Thickness | Customized |
| Standard Length | 6 m / 12 m |
| Surface | Galvanized / Smooth Zinc Finish |
| Ends | Plain / Cut / Customized |
| Inspection | MTC / Third-Party Inspection Available |
SS400 is a mainstream Japanese carbon structural steel grade. It fits general‑purpose construction work, metal fabrication and mechanical component manufacturing, ideal for projects seeking solid strength alongside cost‑effective performance.
STKR400 is a JIS‑specified grade dedicated to structural hollow sections. It is especially developed for square and rectangular hollow profiles applied in building works and structural steel fabrication.
Your grade selection should take into account target structural strength, physical dimensions, fabrication workflows, welding conditions and overall project technical requirements.
Hot‑Dip Galvanized Finish
The zinc layer forms a protective barrier against moisture and atmospheric rust, enabling these square tubes to perform reliably under outdoor and semi‑exposed service conditions.
Solid Structural Performance
SS400 and STKR400 are preferred grades for structural and fabrication‑focused projects. They deliver good strength, stable dimensions and great workability for further processing.
Square Hollow Profile
This square‑shaped hollow section ensures effective load distribution with a neat visual finish. It also simplifies cutting, drilling, welding and on‑site assembly work.
Highly Adaptable Specifications
We tailor tube sizes, wall gauges, cut lengths, galvanizing standards, end finishing and packaging solutions to match the demands of various construction and engineering projects.
JIS G3466 SS400 / STKR400 galvanized square tubes see extensive real‑world use across many sectors:
Steel structural frameworks
General building construction
Warehouse and workshop steel structures
Machine base frames
Fencing systems and gate assemblies
Handrails and safety guardrails
Agricultural facilities including greenhouse builds
Solar panel mounting supports
Support frames for outdoor equipment
Trailer and vehicle structural parts
Industrial working platforms
Custom metal fabrication and general structural supports
For components subjected to rain, dampness and open‑air environments, galvanized square tubing outperforms bare carbon steel in corrosion defence. Its zinc coating slows down surface rust formation, cutting down how often repainting and routine upkeep are needed.
JIS G3466 SS400 / STKR400 Hot Dip Galvanized Square Tube also give buyers a fully standardised material choice. This suits projects following Japanese technical requirements or those that call for compatible structural hollow sections.
Royal Steel Group supplies complete inspection services and supporting documentation to streamline your international procurement. Our scope of checks covers the following items:
Chemical composition analysis
Mechanical performance testing
Outer dimension verification
Wall thickness measurement
Squareness and straightness assessment
Zinc coating evaluation
Surface condition review
Full Mill Test Certificates (MTC) are issued. SGS and other independent third‑party inspections can also be arranged at your request.
We can deliver galvanized square tubes with varied surface finishes tailored to different project conditions:
Hot‑Dip Galvanized
Well‑suited for outdoor structures and working environments demanding high‑level corrosion protection.
Pre‑Galvanized
A cost‑effective alternative featuring a thinner zinc layer, ideal for projects prioritizing economy.
Extra Protective Coating
Paint and other protective treatments are an option if you need further rust defence or custom visual finishes.
For export shipments, square tubes are firmly bundled. Extra protective materials may be applied to minimise surface scratches and damage during handling, loading and ocean transit.
Our typical shipping solutions cover:
20GP, 40GP and 40HQ container shipments
Bulk vessel delivery
Custom‑made export packaging
We can adjust tube lengths and bundle sizes to optimise container space utilisation and help bring down your overall freight expenses.
Q1: Which standard applies to these galvanized structural steel tube?
A: Our products comply with JIS G3466. You may select either SS400 or STKR400 grade based on your project’s technical needs.
Q2: How do SS400 and STKR400 differ from each other?
A: SS400 is a general‑purpose structural steel grade. STKR400, by contrast, is engineered specifically for structural hollow sections. The right grade is determined by your section profile and overall project specifications.
Q3: Do you offer hot‑dip galvanizing?
A: We do provide hot‑dip galvanized square tubes, and zinc coating weights can be adjusted to meet your requirements.
Q4: Can you make non‑standard sizes?
A: Custom manufacturing is supported. Outer dimensions, wall thickness, cut‑to‑length and surface finishing can all be tailored within our production capability.
Q5: What lengths do you normally supply for export?
A: 6 m and 12 m are our standard export lengths. Alternative lengths can be negotiated for individual projects.
Q6: Are quality certification documents available?
A: Certainly. Mill Test Certificates (MTC) will be issued, and we can arrange SGS or other third‑party inspections upon your request.
Sourcing JIS G3466 SS400 / STKR400 galvanized steel hollow section for building projects, mechanical assemblies, fencing, solar support structures or industrial metal fabrication?
Royal Steel Group delivers galvanized square hollow sections with fully adaptable specifications, full‑range quality checks, export‑grade packaging and end‑to‑end global delivery services.
ROYAL GROUP
Address
Kangsheng development industry zone,
Wuqing district, Tianjin city, China.
Phone
Hours
Monday-Sunday: 24-hour Service
-
Construction building material Grade B 8 INCH L...
-
High Quality Building Materials 0.12-4.0mm SPCC...
-
Steel Wire with Standard En 10270 Cold Drawn S...
-
DC03 Cold-Rolled CR Carbon Steel Sheets for Cor...
-
100x100x6 SS41B Slotted Angle Bar Line Structur...
-
Factory Price Dx51d Z275 Gi Coil 0.55mm Thickne...
