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 | — | — | — |
| 316 / 316L — Alleima 3R65 | ≤0.030 | 0.4 | 1.7 | ≤0.040 | ≤0.015 | 17 | 11.5 | 2.1 | — | — |
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 |
| 316 / 316L — Alleima 3R65 | 20 | ≥220 | 515–690 | ≥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 ↗
316 / 316L — Alleima 3R65: Nominal mill chemistry and published seamless tube/pipe properties. Elongation A uses L₀ = 5.65√S₀. The source states proof strength can be about 10 MPa lower for wall above 10 mm. 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.
Seamless pipe and tube: which standard applies?
The product form determines the specification framework. ASTM A312 addresses austenitic stainless steel pipe; ASTM A269 addresses general-service austenitic tubing. Seamless describes the manufacturing route, while the selected standard defines the relevant material and acceptance requirements.
| Reference item | Technical guidance |
|---|---|
| Pipe enquiry | Grade + pipe standard + size/schedule |
| Tube enquiry | Grade + tube standard + actual OD/wall |
| Manufacturing route | Seamless |
| Assembly requirements | Fitting compatibility, finish and hardness as specified |
How to use this information
For fitting-based tubing assemblies, surface finish, hardness, OD and wall thickness are also selection variables. Pressure capacity requires the approved material and dimensions with the applicable design rules.
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: ASTM A312/A312M-25 — pipe specification · ASTM A269/A269M-25 — general-service tubing · Swagelok — tubing selection and handling
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 | Specified grade |
| Manufacturing type | Seamless |
| 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 |
Specify seamless construction accurately
Start by deciding whether your drawing calls for a pipe or a tube. A pipe enquiry may identify nominal size and schedule, while a tube enquiry usually needs actual outside diameter and wall thickness. State seamless construction separately from the grade so the material and manufacturing requirements are both clear. If a drawing includes machining allowances, add the required finished and supplied dimensions.
Comparing supplier quotations
Compare quotations using the same grade, construction, dimensions and inspection requirements. A different wall thickness or testing requirement can change the scope even when the product name looks identical.
Example enquiry checklist
Seamless stainless steel tube; required grade; OD × wall thickness; cut length; tolerance; quantity; material standard and delivery destination.
SS Seamless 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 seamless 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 |
|---|---|
| Grade and material standard | Specify with the enquiry |
| Pipe size/schedule or tube OD/wall | Specify with the enquiry |
| Testing and weld requirements where applicable | 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.
Choosing stainless steel seamless pipes and tubes
Seamless construction means the pipe or tube does not have a longitudinal welded seam. That construction choice is only one part of a purchase specification: material grade, dimensions, heat treatment, testing and service conditions still need to be defined. Do not assume a seamless product is suitable for a pressure or temperature simply from its manufacturing type.
Pipe specifications and tube specifications
For a pipe enquiry, state nominal pipe size and schedule or the required outside diameter and wall thickness. For a tube enquiry, provide actual outside diameter, wall thickness and tolerances. Keep the product form explicit so the quotation addresses the right dimensional system.
Questions about SS Seamless Pipes & Tubes
Are seamless pipes and seamless tubes interchangeable?
They should not be substituted without checking the specification. Pipe and tube enquiries can use different dimensional conventions, tolerances and material standards. Confirm the exact product form and dimensions with your project engineer.
Which standard should I include?
ASTM A312 covers austenitic stainless steel pipe, while ASTM A269 covers stainless steel tubing for general service. The applicable standard depends on the product and project. Include its edition and grade in your enquiry.
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.
