Specify with confidence.
Technical data tables
Chemical composition reference — weight %
Alleima rows are nominal compositions, with limits where marked. ATI rows are flat-product chemistry limits, not pipe limits. “—” means no value is provided here; it does not mean zero.
| Reference material | C | Si | Mn | P | S | Cr | Ni | Mo | Cu | Ti |
|---|---|---|---|---|---|---|---|---|---|---|
| 309 — ATI flat-product reference | ≤0.20 | ≤0.75 | ≤2.00 | ≤0.045 | ≤0.030 | 22–24 | 12–15 | — | — | — |
Mechanical property reference
Values apply to the cited mill product and test basis. They are not certificates or universal acceptance values for Tokk Steel material.
| Reference material | Test °C | Rp0.2 / yield (MPa) | Tensile (MPa) | Elongation (%) | Hardness |
|---|---|---|---|---|---|
| 309 — ATI flat-product reference | 25 | 290 typical | 621 typical | 49 typical | Not listed |
309 — ATI flat-product reference: ATI chemistry limits reference ASTM A167/A240 flat products. Mechanical figures are its typical sample averages at 25°C with 50.8 mm elongation gauge length. These are not A312 pipe acceptance limits. View source datasheet ↗
Pipe dimensions and schedules — reference chart
Selected B36.19 dimensions as published in Alleima’s pipe chart. This is a dimensional reference, not a stock or availability list.
| NPS (in.) | OD (mm) | 10S wall (mm) | 40S wall (mm) | 80S wall (mm) |
|---|---|---|---|---|
| 1/4 | 13.72 | 1.65 | 2.24 | 3.02 |
| 3/8 | 17.15 | 1.65 | 2.31 | 3.20 |
| 1/2 | 21.34 | 2.11 | 2.77 | 3.73 |
| 3/4 | 26.67 | 2.11 | 2.87 | 3.91 |
| 1 | 33.40 | 2.77 | 3.38 | 4.55 |
| 1¼ | 42.16 | 2.77 | 3.56 | 4.85 |
| 1½ | 48.26 | 2.77 | 3.68 | 5.08 |
| 2 | 60.33 | 2.77 | 3.91 | 5.54 |
| 2½ | 73.03 | 3.05 | 5.16 | 7.01 |
| 3 | 88.90 | 3.05 | 5.49 | 7.62 |
| 3½ | 101.60 | 3.05 | 5.74 | 8.08 |
| 4 | 114.30 | 3.05 | 6.02 | 8.56 |
Calculated pipe weight — 40S examples
Calculated using density 8.00 g/cm³ and nominal dimensions: kg/m = π/4 × (OD² − ID²) × density / 1000. Dimensions are in mm. Actual mass varies with alloy density and tolerances; these are not certified weights.
| NPS (in.) | OD (mm) | Wall (mm) | ID (mm) | Approx. kg/m |
|---|---|---|---|---|
| 1/4 | 13.72 | 2.24 | 9.24 | 0.646 |
| 3/8 | 17.15 | 2.31 | 12.53 | 0.862 |
| 1/2 | 21.34 | 2.77 | 15.80 | 1.293 |
| 3/4 | 26.67 | 2.87 | 20.93 | 1.717 |
| 1 | 33.40 | 3.38 | 26.64 | 2.550 |
| 1¼ | 42.16 | 3.56 | 35.04 | 3.454 |
| 1½ | 48.26 | 3.68 | 40.90 | 4.123 |
| 2 | 60.33 | 3.91 | 52.51 | 5.544 |
| 2½ | 73.03 | 5.16 | 62.71 | 8.802 |
| 3 | 88.90 | 5.49 | 77.92 | 11.509 |
| 3½ | 101.60 | 5.74 | 90.12 | 13.829 |
| 4 | 114.30 | 6.02 | 102.26 | 16.383 |
Tables are sourced reference data or explicitly calculated examples. Your order’s grade, product standard and material documentation determine acceptance. Request current pricing with your quantity and specification; no competitor prices or pressure ratings have been transferred.
309: material identity and selection
309 is identified as UNS S30900. Published alloy guidance places 309 among grades considered for elevated-temperature applications. 309 and 309S have separate grade identifiers and should not be merged on a purchase specification.
| Reference item | Technical guidance |
|---|---|
| Grade designation | 309 |
| UNS identifier | S30900 |
| Material family | Austenitic chromium-nickel stainless steel |
| Pipe specification to review | ASTM A312, where required by the project |
| Tube specification to review | ASTM A269 or the application-specific tube standard |
How to use this information
Published grade behaviour is general reference information. Establish the permitted service temperature and supplied product requirements through the design and governing pipe or tube standard.
Reference information explains the material or specification. Confirm actual dimensions, grade compliance, certificates and availability with the quotation. Manufacturer-specific approvals and properties apply to that manufacturer’s product.
Technical references: ATI — 309, 309S, 310 and 310S grade reference · ASTM A312/A312M-25 — pipe specification · ASTM A269/A269M-25 — general-service tubing
Send the details below so our team can review your requirement. Sizes, supply conditions and documentation will be confirmed with your quotation.
| Material | Stainless steel |
| Grade | 309 |
| Manufacturing type | Specify seamless or welded where applicable |
| Dimensions | Provide outside diameter, wall thickness and length |
| Standard & tolerance | Provide the applicable project specification |
| Finish | Specify your required surface finish |
| Quantity & documentation | Specify quantity and any certificate or inspection requirements |
Resolve the 309 grade suffix before quoting
Use the exact grade designation required by the design. If the request simply says 309, clarify whether any suffix or additional material requirement is specified. Define pipe or tube form, construction and dimensions before reviewing alternatives. Include end preparation and fabrication needs where they form part of the supply requirement.
Comparing supplier quotations
Treat a proposed 309S or other variant as a separate material decision. The drawing, material standard and engineering review should determine whether an alternative is acceptable.
Example enquiry checklist
SS 309 pipe or tube; exact grade designation; material standard; construction; dimensions; length; end condition; quantity.
SS 309 Pipes & Tubes supplier enquiries in Mumbai, India
Tokk Steel is the stainless steel pipes and tubes division of Shatrunjay Special Alloy in Mumbai, India. Send your ss 309 pipes & tubes specification to our team with the grade, dimensions and quantity required by your project.
For a local enquiry in Mumbai, include your preferred collection or delivery arrangements for review. For a project elsewhere in India, include the destination and required date so availability, logistics and the quotation scope can be confirmed. Your location does not replace the technical specification: attach the drawing or material requirement when one is available.
Request a product quotation ↗Specification details for this product
| Detail | Information to provide |
|---|---|
| Exact grade and governing standard | Specify with the enquiry |
| Pipe or tube dimensional designation | Specify with the enquiry |
| Construction type and documentation | Specify with the enquiry |
Typical application areas
- Project-specific equipment
- Industrial assemblies
- Requirements defined by your design
Final material suitability should be assessed against your project’s operating conditions and applicable standards.
Buying ss 309 pipes & tubes
State the exact 309 designation and any required suffix. Do not substitute 309S or another grade without engineering acceptance.
Define the purchase specification
Match the exact grade on the enquiry, quotation and material documentation. Any proposed substitution should be reviewed against the project requirements.
Grade guidance: Outokumpu stainless steel types. Check the applicable material specification for acceptance criteria.
Questions about SS 309 Pipes & Tubes
What should I specify for ss 309 pipes & tubes?
State the exact 309 designation and any required suffix. Do not substitute 309S or another grade without engineering acceptance.
Are all listed sizes and grades held in stock?
Availability, dimensions, lead time and documentation are confirmed with your quotation. Send your exact requirement rather than assuming availability from a product category.
Quotation questions
What should I include in my enquiry?
Include grade, dimensions, quantity, required standard, finish and delivery destination. Attach your specification when sending the email draft.
Can you confirm sizes and availability?
Our team will review your dimensions and confirm availability and lead time as part of the quotation.
