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.
Micro tubing with a specified 304 grade
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
The word micro does not establish an inspection tolerance or welding process. Define bore, OD, wall and end condition, then select the governing specification and process explicitly.
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 |
Connect the 304 micro tube geometry to the assembly
State 304 grade, welded construction and any required welding process separately. Include the internal bore, outside diameter and dimensional tolerances needed by your component. For a fitted assembly, add cut length, end finish and any straightness requirement. A drawing helps identify which dimension controls the fit.
Comparing supplier quotations
When comparing quotations, check the bore and end condition as well as nominal OD. A small outside diameter alone does not establish precision suitability.
Example enquiry checklist
SS 304 welded micro tube; process requirement; OD and bore; tolerances; length; end condition; quantity; assembly drawing.
SS 304 Welded / ERW Micro 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 / erw micro 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 bore | Specify with the enquiry |
| Welding process and weld condition | Specify with the enquiry |
| Tolerance and end condition | 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 / erw micro tubes
Define 304 grade, weld requirements, outside diameter and internal bore with acceptance tolerances.
Define the purchase specification
Micro tube is a descriptive label, not a complete dimensional specification. The bore and permitted dimensional variation matter for fit and flow.
Questions about SS 304 Welded / ERW Micro Tubes
What should I specify for ss 304 welded / erw micro tubes?
Define 304 grade, weld requirements, outside diameter and internal bore with acceptance tolerances.
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.
