Overview
We supply 253MA as UNS S30815 or EN 1.4835. Send the product standard, form, dimensions, service conditions and inspection scope for a quote.
Standards & Designations
- 253MA / UNS S30815
- EN 1.4835 X7CrNiSiNCe21-11
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
253MA uses nitrogen and rare-earth alloying for creep and cyclic-oxidation performance. It is a useful comparison for cyclic furnace tubes and supports, but is not a universal choice for carburizing gas or cracked-ammonia muffles.
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| Property | Value | Unit |
|---|---|---|
| C | 0.08 | mass % |
| Si | 1.6 | mass % |
| Mn | ≤0.8 | mass % |
| P | ≤0.040 | mass % |
| S | ≤0.030 | mass % |
| Cr | 21 | mass % |
| Ni | 11 | mass % |
| N | 0.17 | mass % |
| Ce | 0.05 | mass % |
Reference basis: 253 MA / UNS S30815 / EN 1.4835 · seamless tube and pipe · 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 |
|---|---|---|
| 0.2% proof strength, Rp0.2 | ≥310 | MPa |
| 1.0% proof strength, Rp1.0 | ≥350 | MPa |
| Tensile strength, Rm | 650–850 | MPa |
| Elongation after fracture | ≥40 | % |
Reference basis: 253 MA / UNS S30815 / EN 1.4835 · seamless tube and pipe · solution annealed · 20°C · ranges.
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 | 200 / 155 / 120 | GPa |
| Thermal expansion, 20°C to 200 / 400 / 800°C | 18.5 / 19.0 / 19.5 | 10⁻⁶/K |
| Thermal conductivity at 20 / 400 / 800°C | 15 / 21 / 26 | W/m·K |
| Specific heat capacity at 20°C | 500 | J/kg·K |
| Electrical resistivity at 20°C | 0.84 | µΩ·m |
Reference basis: 253 MA / EN 1.4835 · 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.
Scroll horizontally to see every column.
| Product form | Specification | Surface / condition | Availability |
|---|---|---|---|
| Cold-rolled sheet | 1.5 × 1500 × 3000 mm | 2D · Solution annealed | In stock |
| Hot-rolled plate | 4 × 1500 × 6000 mm | No.1 · Solution annealed | Common specificationIn stock |
| Hot-rolled coil | 3 × 1500 mm coil | No.1 · Solution annealed | Common specificationIn stock |
| Seamless pipe | OD 168.3 × 7.11 wall × 6000 mm | Pickled · Solution annealed | In 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.