Overview
We supply 309S as UNS S30908 or EN 1.4833. State the designation and product standard you require, plus form, dimensions and inspection scope.
Standards & Designations
- Type 309S / UNS S30908
- EN 1.4833 X18CrNi23-13
State the selected designation, complete product standard, edition and purchaser specification in the RFQ and purchase description. Similar grade names are not automatically interchangeable.
Chemical Composition
309S uses the lower-carbon specification within the 309 family. Compare with 310S for a higher chromium/nickel alloy balance, or with 309Si2 when high silicon is part of the material selection.
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| Property | Value | Unit |
|---|---|---|
| C | 0.06 | mass % |
| Cr | 22.3 | mass % |
| Ni | 12.3 | mass % |
| Si | 0.3 | mass % |
Reference basis: 309S / EN 1.4833 · flat product · typical producer values · room temperature · typical values.
Mechanical Properties
For loaded furnace parts, creep and exposure time matter alongside room-temperature strength. A lower-carbon S grade is not automatically interchangeable with the corresponding non-S grade for a load-bearing design.
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| Property | Value | Unit |
|---|---|---|
| Tensile strength, Rm | ≥515 | MPa |
| 0.2% proof strength, Rp0.2 | ≥205 | MPa |
| Elongation after fracture | ≥40 | % |
| Hardness | ≤95 HRB / ≤217 HB | — |
Reference basis: ASTM Type 309S / UNS S30908 · flat or long product · annealed · room temperature · minimum values.
Physical Properties
Allow for thermal expansion and temperature-dependent properties when setting clearances and supports. Enter a confirmed density when estimating weight.
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| Property | Value | Unit |
|---|---|---|
| Density at 20°C | 7.8 | kg/dm³ |
| Modulus of elasticity at 20 / 400 / 800°C | 196 / 150 / 120 | GPa |
| Thermal expansion, 20°C to 200 / 400 / 800°C | 18.8 / 19.4 / 20.0 | 10⁻⁶/K |
| Thermal conductivity at 20 / 400 / 800°C | 15 / 19 / 25 | W/m·K |
| Specific heat capacity at 20°C | 472 | J/kg·K |
| Electrical resistivity at 20°C | 0.87 | µΩ·m |
Reference basis: 309S / EN 1.4833 · flat product · typical producer values · temperatures stated in each row · typical values.
High-Temperature Characteristics
Air oxidation, cycling, sulfur-bearing gases and carburization are separate selection questions. Check the actual atmosphere before using a temperature screening value.
Available Product Forms
Choose the form that fits the component geometry and fabrication plan, then use its product page to prepare dimensions, finish, processing, inspection and packing requirements.
The product-form list shows our regular supply capability. The dated stock table shows only current and common inventory; a form or boundary size not listed there is not a supply limit.
Common specifications and stock
Stock snapshot:
The product-form list shows our regular supply capability. The dated stock table shows only current and common inventory; a form or boundary size not listed there is not a supply limit.
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| Product form | Specification | Surface / condition | Availability |
|---|---|---|---|
| Cold-rolled sheet | 2 × 1500 × 3000 mm | 2B · Solution annealed | Common specificationIn stock |
| Hot-rolled plate | 8 × 1500 × 6000 mm | No.1 · Solution annealed | Common specificationIn stock |
| Hot-rolled coil | 3 × 1500 mm coil | No.1 · Solution annealed | Common specificationIn stock |
| Slit strip | 2 × 200 mm coil | 2B · Solution annealed | Common specificationIn stock |
| Seamless pipe | OD 168.3 × 7.11 wall × 6000 mm | Pickled · Solution annealed | Common specificationIn stock |
| Round bar | Ø40 × 6000 mm | Pickled · Hot rolled / solution annealed | Common specificationIn stock |
Please confirm current quantity, tolerances, documents and delivery in the written quotation.
Available Dimensions
We quote dimensions and tolerances for your selected form and quantity; there is no single stock-size range covering every grade and form.
Processing & Welding
Share the drawing, delivery condition, forming method, joint design, filler requirements, WPS/PQR, heat input, cleaning or passivation and NDT scope. Drawing geometry and the ordered standard help the fabricator prepare the process plan and qualified procedure.
Processing & WeldingIndustry Applications
Typical buying contexts include furnace liners, heat shields, supports and thermal-equipment parts. Select the form from the component drawing.
Inspection Options
- MTC identifying the heat, grade, ordered standard and reported test results.
- Dimensional, surface, traceability and marking records specified by the purchase order.
- NDT, PMI, third-party inspection or additional test reports only when ordered.
- EN 10204 3.1 wording only when the issued certificate explicitly carries that type.
Related Grades
Compare grade families, product forms and service inputs before requesting an alternative. Any substitution must follow the governing standard, design basis and project approval process.
What to Send for a Quote
Include the exact grade designation, governing product standard and edition, product form, dimensions, condition, quantity, service inputs, inspection scope, certificate type, packing and destination.
We normally reply within 1 business day. Technical enquiries may require additional review.