Excerpt:
Cold-formed welded CHS for trusses, supports, railing structures and machinery frames. Review connections and intersecting cuts together with material requirements.
QIDA METAL · PRODUCT PROCUREMENT GUIDE
S355J2H Welded Circular Hollow Section
Cold-formed welded CHS for trusses, supports, railing structures and machinery frames. Review connections and intersecting cuts together with material requirements.
| Procurement Item | Details |
|---|---|
| Applicable Standard | EN 10219-1 / S355J2H |
| Product Category | Steel Pipes & Tubes / Welded Pipe |
| Dimensions & Quantity | The sizes below are enquiry references. Available combinations, quantities and delivery times are subject to written quotation. |
| Documentation | Specify heat/batch inspection documents, standard edition, traceability and project certification in your enquiry. Documents are subject to confirmation of actual availability. |
01 / Product Features & Selection
- The continuous circular profile suits multidirectional members and joints. Structural design determines load capacity.
- Specify structural tube as actual OD × wall thickness instead of treating a pressure-pipe Schedule as its structural size.
- Include intersecting cuts, hole locations and corrosion protection in drawing review to reduce site processing.
02 / Specifications, Dimensions & Ordering Options
These dimensions help define your purchase requirement; they do not imply that every combination is in stock. Specify tolerances, quantity, delivery condition and destination port. Submit drawings for special sizes.
| Parameter | Specification / Enquiry Range | Points to Confirm |
|---|---|---|
| Outside Diameter D / mm | 48.3, 60.3, 76.1, 88.9, 101.6, 114.3, 139.7, 168.3, 193.7, 219.1, 244.5, 273.0, 323.9 | Select against EN 10219 dimensions and project design. |
| Wall Thickness t / mm | 2.0, 2.5, 3, 4, 5, 6, 6.3, 8, 10, 12.5, 16 | Verify dimensions, thickness and corner combinations against the standard and actual availability. |
| Length / m | 6, 12 or drawing-specified lengths | Specify ends, cut-length tolerance and drilling positions. |
| Material & Dimensional Standards | EN 10219-1 technical requirements; EN 10219-2 dimensional tolerances | Hot-finished EN 10210 and cold-formed EN 10219 are not interchangeable without review. |
| Surface & Processing | Black steel; cutting / drilling by enquiry; corrosion protection agreed separately | Galvanizing requires review of chemistry, vent / drain holes and welded joints. |
03 / Standard Chemical Composition
EN 10219-1 / S355J2H. Values are mass percentages (%). Maximum limits are shown by ≤, minimum limits by ≥; ranges are specification limits and Fe is the balance. These are not measured results for a current delivery heat.
| Element / Indicator | Requirement or Range |
|---|---|
| C | ≤0.22 |
| Si | ≤0.55 |
| Mn | ≤1.60 |
| P | ≤0.030 |
| S | ≤0.030 |
| CEV | ≤0.45（t≤16 mm） |
| Fe | Balance |
Heat analysis, mass %, for the cold-formed welded hollow sections with t≤16 mm shown here. Fully killed steel and nitrogen-binding requirements follow the standard. CEV is carbon equivalent, not an element.
04 / Mechanical Properties & Application Limits
| Thickness / Material Condition | Yield Strength Re / Rp0.2 (MPa) | Tensile Strength Rm (MPa) | Elongation After Fracture A (%) |
|---|---|---|---|
| t<3 mm | ≥355 | 510–680 | ≥20; geometric-ratio adjustment applies |
| 3≤t≤16 mm | ≥355 | 470–630 | ≥20; geometric-ratio adjustment applies |
Strength in MPa, proportional elongation A in %. Reference 10×10 mm longitudinal impact ≥27 J / −20°C. Reduced specimens and thin walls follow standard reductions or exemptions. Where CHS D/t<15 or SHS/RHS (B+H)/(2t)<12.5, minimum elongation may be reduced by 2 percentage points.
05 / Inspection, Processing & Quality Checks
- Check CHS OD, wall, ovality, straightness and local surface defects.
- Specify connection-cut angles, mating diameters, welds and visible-face requirements.
- Verify impact class and thin-wall specimen conditions individually.
- Structural and pressure service are different; a structural grade does not directly replace a fluid-piping material specification.
06 / Export Packaging for This Product
| Stage | Recommended Arrangement | Key Considerations |
|---|---|---|
| End Protection | Use end caps, bevel guards or thread protectors appropriate to the pipe ends. | Keep stainless steel surfaces free of carbon-steel particles and chloride contamination. |
| Size-Separated Bundles | Bundle by OD, wall thickness, length and heat/batch, with durable identification. | Use liners or supported crates for small-diameter thin-wall tubes where appropriate. |
| Transport Support | Multiple supports, strap padding, anti-roll chocks and securing arrangements. | Keep long lengths properly supported; verify package weight and length before loading. |
Before shipment, cross-check product, grade, heat number, size, piece count, net weight and gross weight against the packing list. Match labels to inspection documents. For solid-wood pallets, dunnage or crates, check destination-country rules; wood subject to ISPM 15 must be treated and marked by an approved provider. Load dry cargo and arrange supports, blocking and securing according to weight and centre of gravity.
07 / How Qida Supports Your Procurement
| Procurement Stage | Qida Coordination | Information for the Buyer |
|---|---|---|
| Requirement Review | Review application, standards, material condition, drawings and acceptance items. | A checkable specification list helps reduce language and unit-conversion errors. |
| Order Confirmation | Confirm material, processing, inspection, packaging, delivery milestones and cost responsibilities item by item. | A clear written quotation and mutually agreed purchase requirements. |
| Delivery Coordination | Coordinate production / sourcing progress, labels, packing lists and shipping documents. | Check dimensions, quantities and heat/batch correspondence at agreed milestones. |
| After-Sales Follow-Up | Review issues using order number, heat number, arrival photographs and test records. | A defined issue description and documented resolution communications. |
Qida focuses on clear specifications, material requirement checks and delivery coordination. Include cutting, cut-to-length, surface treatment, third-party inspection and certificate requirements in your enquiry so that the achievable scope can be agreed before order placement.
08 / Request for Quotation
For an accurate quotation, please provide:
S355J2H / EN 10219 + D×t + length + joint drawings / intersecting cuts + quantity + protection / inspection + destination port. Include project specifications and inspection plans.
Define Specifications, Quality and Delivery in One Enquiry
Send your purchasing list to Shandong Qida Metal Technology Co., Ltd. We will review standards, dimensions and destination requirements with you.
Send an Enquiry · qidamt@163.com
139-6951-8618
Technical Sources & Ordering Notes
This selection and enquiry guide is compiled from the primary public sources below. Values are not an inspection certificate for a delivery batch and do not imply a supply or authorization relationship with the source publishers. The agreed order governs standard edition, product form, thickness range, specimen and delivery condition. Similar grades are not automatically equivalent. Confirm project certification and inspection documents before ordering.
