Excerpt:
Cold-formed welded RHS for equipment frames, supports and structural fabrication. Specify height, width, wall thickness, corner radii, twist and weld position together.
QIDA METAL · PRODUCT PROCUREMENT GUIDE
S355J2H Welded Rectangular Hollow Section
Cold-formed welded RHS for equipment frames, supports and structural fabrication. Specify height, width, wall thickness, corner radii, twist and weld position together.
| 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 closed rectangular section supports frame layouts aligned with structural loading directions.
- The defined J2H low-temperature impact class helps align material selection with service temperature and inspection plans.
- Dimensional checks include corners and twist to reduce assembly and fixture-fit issues.
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 |
|---|---|---|
| Section H×B / mm | 60×40, 80×40, 100×50, 120×60, 150×100, 200×100, 200×150, 250×150, 300×200 | Reference enquiry sizes only; confirm actual wall-thickness combinations. |
| 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 S355J2H, EN 10219, inspection documents and heat number. Parent-coil grade alone is insufficient.
- Measure height, width, wall, outer corner radius, concavity / convexity, straightness and full-length twist.
- Agree weld testing and impact specimen conditions. Structural hollow sections are not automatically pressure pipes.
- Retain traceability after drilling / cutting. Agree venting, draining and closed-cavity treatment before galvanizing.
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:
EN 10219 edition / S355J2H + H×B×t + length + weld position + corner / twist tolerances + quantity + processing drawings + 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.
