Excerpt:
For outdoor frames, supports and prefabricated components. Specify the EN 10219 steel substrate first, then the finished-product galvanizing arrangement. Distinguish pre-galvanized strip-welded tube from galvanizing after tube manufacture.
QIDA METAL · PRODUCT PROCUREMENT GUIDE
Hot Dip Galvanized Square & Rectangular Hollow Sections
For outdoor frames, supports and prefabricated components. Specify the EN 10219 steel substrate first, then the finished-product galvanizing arrangement. Distinguish pre-galvanized strip-welded tube from galvanizing after tube manufacture.
| Procurement Item | Details |
|---|---|
| Applicable Standard | EN 10219-1 / S355J2H |
| Product Category | Steel Pipes & Tubes / Galvanized 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
- Separate acceptance of steel grade and corrosion coating clarifies the purchase specification.
- Drawings can define cutting, drilling and welding before galvanizing the completed fabrication.
- Agree vent / drain holes and connection-face protection in advance for coating quality and assembly fit.
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 |
|---|---|---|
| Square / Rectangular Section / mm | SHS: 40×40 to 250×250; RHS: 60×40, 80×40, 100×50, 120×60, 150×100, 200×100, 250×150, 300×200 | Confirm dimensions, wall thickness, corners and feasibility of the galvanizing route. |
| 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. |
| Coating Process | Finished-product hot dip galvanizing to EN ISO 1461, for applicable non-centrifuged steel articles | Continuously pre-galvanized tube and weld repairs require separately agreed applicable specifications. |
| Steel Wall Thickness t / mm | Minimum Local Coating Thickness / µm | Minimum Mean Coating Thickness / µm |
|---|---|---|
| t<1.5 | 35 | 45 |
| 1.5≤t≤3 | 45 | 55 |
| 3<t≤6 | 55 | 70 |
| t>6 | 70 | 85 |
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
- Verify whether galvanizing occurs after manufacture or uses pre-galvanized strip. A silver appearance does not establish equivalence.
- Accept local and mean coating thickness using standard sampling rules; one reading is not the mean.
- Closed cavities require an approved venting / draining design. Drawings specify hole positions and subsequent closures.
- Check straightness, ends, weld distortion and mating faces before / after galvanizing. Repair exposed cut edges to the purchase specification.
06 / Export Packaging for This Product
| Stage | Recommended Arrangement | Key Considerations |
|---|---|---|
| Section-Separated Bundles | Identify section designation, steel grade, length and heat number separately. | Keep different grades and delivery conditions in separate bundles. |
| Supports & Corner Protection | Protect flanges, leg edges and machined faces; support long sections at multiple points. | Prevent handling twist, local damage and permanent bending. |
| Loading Checks | Plan loading around cut length, bundle weight, forklift points and container-door clearance. | Assess container type and handling arrangements in advance for long or heavy loads. |
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 + B×B×t + length / pieces + fabrication drawings + galvanizing standard / coating + holes / appearance + inspection documents + destination port. Include inspection plans and project specifications.
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.
