Excerpt:
General-purpose chromium-nickel austenitic process pipe for compatible chemical, utility and equipment lines. TP304 is a pressure-pipe specification grade; decorative polished tubing is not an automatic substitute. The buyer should identify manufacturing route, schedule and inspection requirements together.
QIDA METAL · MATERIALS & EXPORT SUPPLY
ASTM A312 TP304 Stainless Steel Process Pipe
General-purpose chromium-nickel austenitic process pipe for compatible chemical, utility and equipment lines. TP304 is a pressure-pipe specification grade; decorative polished tubing is not an automatic substitute. The buyer should identify manufacturing route, schedule and inspection requirements together.
| Ordering item | Specification |
|---|---|
| Material / standard | ASTM A312/A312M / ASME B36.19M |
| Product family | Stainless Steel 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
- A widely specified austenitic grade simplifies discussion of welded joints, fittings and test documents.
- Schedule-based dimensions let pipe, fittings and end preparation be checked on one nominal size basis.
- Cleaning, PMI, cut lengths and export protection can be included as separately agreed order items.
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 |
|---|---|
| Manufacture | Seamless or welded; specify route and solution heat-treatment condition |
| Dimensions | ASME B36.19M NPS/OD and S-schedules below; other sizes by enquiry |
| Length / m | 6 or agreed fixed/random lengths |
| Ends | Plain or bevelled with clean end protection |
| Surface | Pickled / specified external polish; state bore cleanliness and roughness separately |
| Acceptance | ASTM A312/A999 edition, test route and inspection documents agreed with the order |
| NPS / in | OD | Sch 10S Wall | Sch 40S Wall | Sch 80S Wall |
|---|---|---|---|---|
| 1/2 | 21.3 | 2.11 | 2.77 | 3.73 |
| 3/4 | 26.7 | 2.11 | 2.87 | 3.91 |
| 1 | 33.4 | 2.77 | 3.38 | 4.55 |
| 1½ | 48.3 | 2.77 | 3.68 | 5.08 |
| 2 | 60.3 | 2.77 | 3.91 | 5.54 |
| 3 | 88.9 | 3.05 | 5.49 | 7.62 |
| 4 | 114.3 | 3.05 | 6.02 | 8.56 |
| 6 | 168.3 | 3.40 | 7.11 | 10.97 |
| 8 | 219.1 | 3.76 | 8.18 | 12.70 |
| 10 | 273.0 | 4.19 | 9.27 | 12.70 |
| 12 | 323.9 | 4.57 | 9.53 | 12.70 |
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 | ≤0.08 |
| Mn | ≤2.00 |
| P | ≤0.045 |
| S | ≤0.030 |
| Si | ≤1.00 |
| Cr | 18.0–20.0 |
| Ni | 8.0–11.0 |
| N | ≤0.10 |
| Fe | Balance |
04 / Mechanical Properties & Technical Notes
| Grade / condition | Min tensile / MPa | Min 0.2% proof / MPa | Elongation reference |
|---|---|---|---|
| TP304, solution treated | 515 | 205 | Longitudinal 35%, transverse 25%; specimen/wall provisions apply |
Values are for the standard solution-treated grade reference; confirm route-specific exceptions in the ordered edition. NPS is nominal. In particular, larger 40S/80S walls are not always the same as B36.10 Schedule 40/80. An allowable working pressure requires an engineering calculation.
05 / Processing & Inspection
| Control point | What to agree or inspect |
|---|---|
| Material identity | Request heat-linked chemistry and PMI where specified; PMI does not replace carbon/nitrogen analysis. |
| Manufacture | Confirm seam status, solution treatment and any weld-related inspection. |
| Integrity | Agree hydrostatic or permitted nondestructive electric test and supplementary NDT. |
| Finish | Inspect wall, OD, ends, cleanliness and any agreed internal/external roughness. |
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 |
|---|---|
| Clean separation | Avoid direct contact with carbon-steel dust or dirty steel straps. |
| End protection | Use clean caps and protective wrapping suited to the surface and transit period. |
| Bundle identification | Keep grade, schedule, heat and piece count traceable through the packing list. |
| Loading | Provide supports and blocking; prevent pipes rubbing against container structure. |
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.
