Excerpt:
Square cold-formed welded hollow section for frames, supports and general fabricated assemblies. Equal outside sides simplify symmetrical frame layouts and repeated connections. S235JRH is a specified structural grade; a tube with similar outside dimensions is not automatically equivalent.
QIDA METAL · MATERIALS & EXPORT SUPPLY
S235JRH Welded Square Hollow Section
Square cold-formed welded hollow section for frames, supports and general fabricated assemblies. Equal outside sides simplify symmetrical frame layouts and repeated connections. S235JRH is a specified structural grade; a tube with similar outside dimensions is not automatically equivalent.
| Ordering item | Specification |
|---|---|
| Material / standard | EN 10219-1 material / EN 10219-2 dimensions |
| Product family | Welded Pipe |
| Supply basis | Enquiry-based grade, dimensions, processing and quantity; availability, MOQ and delivery confirmed in the quotation. |
| Inspection documents | Request heat/batch records and EN 10204 3.1 or other documents where required; actual document scope must be confirmed. |
01 / Selection Advantages
- Closed-section geometry provides a practical fabrication form for frames and modular assemblies.
- A consistent grade and size schedule helps coordinate cutting, drilling and corrosion protection.
- Project-specific inspection and bundle labels help keep mixed section sizes identifiable on arrival.
02 / Specifications & Size Schedule
Use the following options to prepare a complete enquiry. The lists do not imply that every dimension combination is stocked or interchangeable with another standard. State the required tolerances and quantity for each line.
| Parameter | Enquiry requirement |
|---|---|
| Outside dimensions | H × B measured externally; dimensions do not describe the clear internal opening |
| Wall / mm | 2–12 requested examples below; production combinations and tolerances confirmed at quotation |
| Length / m | 6, 12 or drawing-based cut lengths |
| Finish | Black/as formed; prepared coating or galvanizing by separate agreement |
| Fabrication | Mitre cuts, holes and assembly preparation from approved drawings |
| Outside H × B / mm | Wall enquiry choices / mm |
|---|---|
| 25 × 25 | 2, 2.5, 3 |
| 30 × 30 | 2, 3 |
| 40 × 40 | 2, 3, 4 |
| 50 × 50 | 2, 3, 4, 5 |
| 60 × 60 | 3, 4, 5 |
| 80 × 80 | 3, 4, 5, 6 |
| 100 × 100 | 4, 5, 6, 8 |
| 120 × 120 | 4, 5, 6, 8 |
| 150 × 150 | 5, 6, 8, 10 |
| 200 × 200 | 6, 8, 10, 12 |
03 / Chemical Composition
Composition is expressed in weight percent. Maximum and minimum limits refer to the listed grade/product reference; final acceptance follows the agreed standard edition and heat analysis.
| Element | Grade reference / wt.% |
|---|---|
| C | ≤0.17 |
| Mn | ≤1.40 |
| P | ≤0.040 |
| S | ≤0.040 |
| N | ≤0.009; nitrogen-binding provisions apply |
| Si | No fixed limit in this grade table |
| Fe | Balance |
04 / Mechanical Properties & Technical Notes
| Condition / wall | Min yield / MPa | Tensile / MPa | Min elongation |
|---|---|---|---|
| S235JRH, t ≤16 mm | 235 | 360–510 | 24% longitudinal; specimen and thickness exceptions apply |
The dimensions are an enquiry matrix, not a declaration that every combination is a standard or stocked size. Strength values apply to the indicated grade/wall group. JR denotes the prescribed impact-quality reference; confirm test requirements, specimen size and documents for the order.
05 / Processing & Inspection
| Control point | What to agree or inspect |
|---|---|
| Weld and form | Review weld seam continuity, corner profile, twist and local surface damage. |
| Dimensions | Measure outside sides, wall away from corners, length, straightness and squareness. |
| Fabrication | Provide hole locations, mitres, weld preparation and coating drawings with revision numbers. |
| Acceptance | Confirm dimensional standard and inspection documents; pressure service is outside this structural product description. |
Include additional tests, third-party inspection, marking transfer and processing requirements before order confirmation. Qida can coordinate the agreed inspection scope and supporting records; an online product guide is not a delivered-batch test certificate.
06 / Export Packaging & Transport
| Packing item | Practical requirement |
|---|---|
| Bundle layout | Separate sizes and heats; use aligned ends and clear piece/bundle identification. |
| Surface care | Use clean dry separators and suitable straps; protect coated or appearance-critical faces. |
| Container planning | Agree maximum piece length, unit bundle mass and handling access before packing. |
| Securing | Dunnage and blocking prevent bundle sliding, wall crushing and end impact. |
Agree destination port, Incoterms rule and named place, package mass, unloading equipment and required shipping documents. Container capacity depends on payload limits, route and load distribution. For regulated solid-wood packaging, confirm the applicable ISPM 15 treatment and marking requirements.
07 / Qida Procurement Support
| Order stage | Our coordination | Buyer benefit |
|---|---|---|
| Specification review | Review material, dimensions, units, drawings and destination requirements. | A clear line-by-line enquiry helps reduce omissions and incompatible substitutions. |
| Processing plan | Confirm cutting, finishing, inspection and identification items in writing. | The buyer can assess scope and acceptance before production or sourcing proceeds. |
| Packing & dispatch | Coordinate labels, packing list, suitable protection and shipping-document requirements. | Piece count and heat/lot correspondence can be checked at agreed milestones. |
| After-sales follow-up | Review order references, arrival photos and inspection records for reported issues. | A documented issue description supports a specific response and follow-up. |
08 / Request a Detailed Quotation
Send the standard and edition, grade, size schedule, quantity per size, material condition, finish, processing drawings, tests/documents, packing requirements and destination port. Include maximum piece or package weight and any project approval requirements. Pricing, minimum quantity and lead time will be confirmed against the actual requirement.
Shandong Qida Metal Technology Co., Ltd. · Liaocheng, Shandong, China
qidamt@163.com · +86 139 6951 8618
Technical References
The primary references below support material selection and enquiry preparation. They do not certify a delivery batch or imply an affiliation with their publishers. Product form, condition, standard edition and supplementary requirements must be agreed in the purchase specification.
