Description
STRUCTURAL & MECHANICAL TUBES / HIMOUNT
Square Steel Tube
Structural and mechanical tubes for construction, machinery frames, racks, supports, infrastructure, and fabrication projects. The page is organized around standard, grade, section size, wall thickness, length, surface condition, coating, and inspection requirements.
Product codeHM-TUBE-001
Product familyStructural hollow section / square and rectangular tube
ProcessERW / welded hollow section
Grade referenceProject-specified structural hollow section grade
Product Categories
RFQ Checklist
- Standard and grade
- OD/section size
- Wall thickness
- Length and tolerance
- Surface or coating
- Certificate and inspection
Manufacturing & Service
Product Overview
Structural and mechanical tubes for construction, machinery frames, racks, supports, infrastructure, and fabrication projects. The page is organized around standard, grade, section size, wall thickness, length, surface condition, coating, and inspection requirements.
Key Specifications
| Product family | Structural hollow section / square and rectangular tube |
|---|---|
| Primary standard / project reference | ASTM A500 / EN 10219 / GB/T 6728 by application |
| Grade / material reference | Project-specified structural hollow section grade |
| Manufacturing route | ERW / welded hollow section |
| Size range | Round, square, or rectangular section size, wall thickness, length, corner radius, tolerance, coating, and packing by buyer specification. |
| Order details to confirm | Standard, grade, size, wall thickness, length, tolerance, surface/coating, quantity, inspection scope, and destination port. |
International Model Search Index
Common international standard, grade, size and RFQ phrases buyers use when searching or preparing a steel enquiry.
Standards and grade calls
ASTM A500 Grade BA500 Grade CS235JRHS275JRHS355JRHS355J2HC250C350STKR400STKR490
Size and order phrases
SHS 50×50100×100200×200RHS 100×50200×100wall 2-16 mmgalvanized or black hollow section
Buyer search phrases
ASTM A500 Grade C square tubeEN 10219 S355JRH RHSS355 rectangular hollow section supplier
Index terms are for RFQ routing and search visibility. Final supply must follow the ordered standard edition, project specification, drawing, MTC and inspection plan.
Common International Models And Size Keywords
| Common standards | ASTM A500, EN 10219, EN 10210, AS/NZS 1163, JIS G3466 |
|---|---|
| Common grade families | A500 Gr.B/Gr.C, S235JRH, S275JRH, S355JRH/J2H, C250/C350, STKR400/STKR490 |
| Common size keywords | SHS, RHS, CHS, square tube, rectangular tube, section size, wall thickness, length |
| RFQ confirmation | Shape, size, wall, grade, length, weld condition, galvanizing/painting, tolerance and MTC |
These common model, grade and size keywords are included to help international buyers route RFQs. They are not automatic equivalents; final supply follows the ordered standard, project specification, MTC and inspection plan.
Common RFQ Model Search Keywords
| Grade model examples | ASTM A500 Grade B, A500 Grade C, S235JRH, S275JRH, S355JRH, S355J2H, C250, C350, STKR400, STKR490 |
|---|---|
| Size / order examples | SHS 50×50, 100×100, 200×200; RHS 100×50, 200×100; wall 2-16 mm; galvanized or black hollow section |
| Buyer search phrases | ASTM A500 Grade C square tube; EN 10219 S355JRH RHS; S355 rectangular hollow section supplier |
These buyer-style keyword examples are for inquiry matching and Google indexing. They should be confirmed against the buyer drawing, ordered standard edition, project specification and MTC before quotation.
International Standard Reference
| Reference | Buyer-facing use |
|---|---|
| ASTM A500 | Cold-formed welded and seamless carbon steel structural tubing reference. |
| EN 10219 | Cold-formed welded structural hollow-section reference. |
| AS/NZS 1163 | Structural steel hollow section reference for Australia/New Zealand projects. |
Common Export Specification Examples
| Standard family | Common grade / model | Typical export wording | Search phrase examples |
|---|---|---|---|
| ASTM A500 | Grade B, Grade C | SHS/RHS/CHS; wall 2-16 mm; black or galvanized; cut length | ASTM A500 Grade C square tube, A500 rectangular tubing |
| EN 10219 / EN 10210 | S235JRH, S275JRH, S355JRH, S355J2H | Cold-formed or hot-finished structural hollow section | EN 10219 S355JRH RHS, S355J2H hollow section |
| Regional HSS grades | AS/NZS 1163 C250/C350, JIS STKR400/STKR490 | Project structural tube; tolerance and corner radius by standard | C350 RHS supplier, STKR400 square tube |
These examples are practical RFQ and search terms used by international buyers. Final quotation should follow the ordered standard edition, project drawing, mill test certificate and inspection plan.
Comparable International References
| Reference family | How buyers use it | Quotation note |
|---|---|---|
| ASTM A500 Grade B/C | North American structural tubing reference for round, square, and rectangular HSS. | Confirm grade, section size, wall, length, and tolerance. |
| EN 10219 S235/S275/S355 | European cold-formed welded structural hollow-section reference. | Use exact steel grade and subgrade from buyer order. |
| AS/NZS 1163 C250/C350/C450 / JIS G3466 STKR | Regional hollow-section comparison references. | Comparison only unless project standard orders them. |
International references are for procurement comparison only. They are not direct substitutions unless the buyer specification, project code, and engineering review approve the change.
Applications
- Building and structural frames
- Machinery and equipment frames
- Racking, supports, and fabrication
- Infrastructure steelwork
- General industrial tube supply
Testing And Documentation
- MTC to ordered standard
- Dimensional and wall-thickness inspection
- Weld and surface inspection
- Impact testing when grade/order requires
- Coating inspection when coated
Packing And Delivery
Pipes and tubes can be bundled, capped, strapped, oiled, galvanized, painted, wrapped, labeled, or seaworthy packed according to product type and shipment method.
Inquiry Information
Please send standard, grade, OD or section size, wall thickness, length, quantity, surface/coating, destination port, and certificate or inspection requirements.
