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 ↗
Calculated round-tube examples
Illustrative dimensions to explain bore and mass calculations, not a standard or supplied range. ID = OD − 2 × wall. Mass assumes nominal circular geometry and density 8.00 g/cm³. Precision tolerances must be specified separately.
| OD (mm) | Wall (mm) | Calculated ID (mm) | Approx. kg/m |
|---|---|---|---|
| 2 | 0.2 | 1.60 | 0.0090 |
| 3 | 0.3 | 2.40 | 0.0204 |
| 6 | 0.5 | 5.00 | 0.0691 |
| 8 | 1 | 6.00 | 0.1759 |
| 10 | 1 | 8.00 | 0.2262 |
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 welded capillary tubing and bore control
ASTM A632 addresses specified small-diameter stainless tubing. Its published scope covers OD below 12.7 mm down to 1.27 mm, with wall below 1.65 mm down to 0.13 mm. These are standard-scope boundaries, not a Tokk Steel stock list; products outside that scope need an appropriate specification.
| Reference item | Technical guidance |
|---|---|
| Grade identity | 304 / S30400 |
| Small-diameter reference | ASTM A632, subject to product scope |
| Nominal wall relation | Wall = (OD − ID) / 2 for a circular tube |
| Acceptance details | Bore, OD/wall tolerances and end condition |
How to use this information
A capillary label does not establish bore size, cleanliness or flow performance. Define these requirements on the drawing and assess whether the specified tube falls within the chosen 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: ASTM A632-19(2025) — small-diameter tubing · Alleima 3R12 — 304/304L grade reference
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 | Welded; specify process |
| 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 the 304 capillary bore and weld condition
Combine the 304 material requirement with a complete capillary geometry specification. State welded construction, the required bore, wall thickness and tolerance, plus any end-finish or cleanliness criteria. If the tube interfaces with a fitting or component, provide the drawing and acceptance requirements for that connection.
Comparing supplier quotations
Review the internal bore and weld condition together when both affect the assembly. A general tube diameter enquiry leaves precision requirements unresolved.
Example enquiry checklist
SS 304 welded capillary tube; OD; bore; wall tolerance; cut length; weld/end condition; quantity; drawing reference.
SS 304 Welded Capillary 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 welded capillary 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 |
|---|---|
| Outside diameter and inside bore | Specify with the enquiry |
| Wall thickness and tolerances | Specify with the enquiry |
| Cut length and end finish | 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 welded capillary tubes
Include 304 grade, welded construction, bore tolerances and any end-finish or cleanliness criteria in your drawing.
Define the purchase specification
For circular tube, nominal wall thickness is half the difference between outside and inside diameter. Include tolerances when assessing the required bore.
Questions about SS 304 Welded Capillary Tubes
What should I specify for ss 304 welded capillary tubes?
Include 304 grade, welded construction, bore tolerances and any end-finish or cleanliness criteria in your drawing.
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.
