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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 304 / 304L — Alleima 3R12 | ≤0.030 | 0.5 | 1.3 | ≤0.030 | ≤0.015 | 18.5 | 10 | — | — | — |
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 |
|---|---|---|---|---|---|
| 304 / 304L — Alleima 3R12 | 20 | ≥210 | 515–680 | ≥45 | ≤90 HRB |
304 / 304L — Alleima 3R12: Nominal mill chemistry and published seamless tube/pipe properties. Elongation A uses L₀ = 5.65√S₀. For wall above 10 mm the source notes proof strength may be about 10 MPa lower. 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.
304: material identity and selection
304 belongs to the chromium-nickel austenitic family. Its identifier is UNS S30400. The grade designation identifies the alloy; it does not specify pipe dimensions, tube tolerances or manufacturing route.
| Reference item | Technical guidance |
|---|---|
| Grade designation | 304 |
| UNS identifier | S30400 |
| 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
Use the approved material standard to establish chemistry and mechanical acceptance requirements. A supplier datasheet for a particular mill product is not a substitute for the project specification.
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: Alleima 3R12 — 304/304L 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 | 304 |
| 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 |
Build a complete SS 304 purchase specification
A 304 enquiry should identify the product form before dimensions are compared. Select seamless or welded construction, then define the outside diameter or pipe designation, wall thickness and required length. For a fabricated assembly, state the surface finish and any dimensional requirements needed at the joining points. Keep the grade designation consistent across the drawing and enquiry.
Comparing supplier quotations
If a quotation proposes 304L or dual-certified material, compare its documented specification with your design requirements before accepting the alternative. The purchase order should record the agreed designation.
Example enquiry checklist
SS 304 tube; selected construction; OD × wall; finish; length; quantity; governing specification; destination.
SS 304 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 304 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 304 pipes & tubes
Keep the 304 grade designation explicit and compare quotations against the same product form and dimensional specification.
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 304 Pipes & Tubes
What should I specify for ss 304 pipes & tubes?
Keep the 304 grade designation explicit and compare quotations against the same product form and dimensional specification.
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.
