Excerpt:
A554 mechanical welded tubing for furniture, handrails, decorative metalwork and general mechanical structures. Define geometry, appearance, weld treatment and assembly; decorative tube is not automatically pressure pipe.
QIDA METAL · PRODUCT PROCUREMENT GUIDE
304 Stainless Steel Decorative Welded Tube
A554 mechanical welded tubing for furniture, handrails, decorative metalwork and general mechanical structures. Define geometry, appearance, weld treatment and assembly; decorative tube is not automatically pressure pipe.
| Procurement Item | Details |
|---|---|
| Applicable Standard | ASTM A554 / MT-304 |
| Product Category | Steel Pipes & Tubes / Stainless Steel 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
- Round, square and rectangular dimensions are listed separately for drawing-based selection.
- Agree visible-face polishing direction, weld position and approval samples to reduce appearance disputes.
- Specify protective film, individual wrapping and subsequent cutting to protect the delivered finish.
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 |
|---|---|---|
| Round Tube OD / mm | 12.7, 15.9, 19.1, 22.2, 25.4, 31.8, 38.1, 42.4, 48.3, 50.8, 60.3, 63.5, 76.2, 101.6 | Nominal inch trade names do not replace actual OD. |
| Square Tube Side / mm | 15, 20, 25, 30, 40, 50, 60, 80, 100 | Also specify wall thickness and outer corner radius. |
| Rectangular Tube H×B / mm | 30×20, 40×20, 50×25, 60×30, 80×40, 100×50, 120×60 | Confirm weld position for visible faces and assembly. |
| Wall Thickness / mm | 0.8, 1.0, 1.2, 1.5, 2.0, 2.5, 3.0 | Agree thin-wall and minimum-wall requirements after polishing. |
| Length / m | 6 or drawing-specified lengths | Inspect burrs, straightness, twist and end dimensions separately. |
| Appearance & Heat Treatment | As-welded, weld-flattened, brushed / mirror finish to sample; specify annealing if required. | A554 does not automatically imply A312 annealing and pressure testing. |
03 / Standard Chemical Composition
ASTM A554 / MT-304. 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 | ≤0.080 |
| Si | ≤1.00 |
| Mn | ≤2.00 |
| P | ≤0.045 |
| S | ≤0.030 |
| Cr | 18.0–20.0 |
| Ni | 8.0–11.0 |
| Fe | Balance |
Mass percentages from the YC INOX A554 table. A 304 designation alone does not qualify mechanical / decorative tube for A312 pressure service.
04 / Mechanical Properties & Application Limits
| Thickness / Material Condition | Yield Strength Re / Rp0.2 (MPa) | Tensile Strength Rm (MPa) | Elongation After Fracture A (%) |
|---|---|---|---|
| Mechanical Tube Delivery Condition | As agreed in the purchase specification | As agreed in the purchase specification | As agreed in the purchase specification |
A554 permits different manufacturing, heat-treatment and surface conditions. Do not copy annealed A312 strength values. Specify tests, specimens and acceptance limits where mechanical acceptance is required.
05 / Inspection, Processing & Quality Checks
- Verify A554 MT-304 chemistry and agree surface samples, colour variation and scratch limits in advance.
- Measure round-tube ovality; for SHS / RHS, measure sides, corners, twist and diagonal difference.
- Avoid excessive weld-grinding thinning. Confirm assembly holes and bend radii for actual wall thickness.
- Load-bearing members and public railings need project structural verification or testing; decorative grade alone does not establish load compliance.
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:
A554 / MT-304 + section shape / size × wall + length / pieces + weld position + polished / brushed sample + protective film / packing + application / drawings + destination port. Include 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.
