Overview
We supply 321H as UNS S32109 or EN 1.4878. State the designation, product standard, form, condition and inspection scope.
Standards & Designations
- Type 321H / UNS S32109
- EN 1.4878
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
321H combines titanium stabilization with controlled higher carbon. It serves a different strength-selection purpose from simply specifying standard 321 for welded equipment.
Scroll horizontally to see every column.
| Property | Value | Unit |
|---|---|---|
| C | 0.05 | mass % |
| Cr | 17.3 | mass % |
| Ni | 9.1 | mass % |
| Si | 0.4 | mass % |
| Ti | Added | mass % |
Reference basis: 321H / EN 1.4878 · flat product · typical producer values · room temperature · typical values.
Mechanical Properties
H variants use controlled higher carbon for elevated-temperature strength. Check creep data, heat treatment and the specified design code before substituting an H and non-H grade.
Scroll horizontally to see every column.
| Property | Value | Unit |
|---|---|---|
| 0.2% proof strength, Rp0.2 at 100 / 400°C | 162 / 123 | MPa |
| Tensile strength, Rm at 100 / 400°C | 410 / 340 | MPa |
Reference basis: 321H / EN 1.4878 · flat product · minimum values · 100°C and 400°C.
Physical Properties
Support spacing and expansion allowance remain important in hot piping and furnace assemblies. A density value alone cannot establish thermal performance.
Scroll horizontally to see every column.
| Property | Value | Unit |
|---|---|---|
| Density at 20°C | 7.9 | kg/dm³ |
| Modulus of elasticity at 20 / 400 / 800°C | 196 / 150 | GPa |
| Thermal expansion, 20°C to 200 / 400 / 800°C | 18.8 / 19.4 | 10⁻⁶/K |
| Thermal conductivity at 20 / 400 / 800°C | 15 / 21 / 26 | W/m·K |
| Specific heat capacity at 20°C | 472 | J/kg·K |
| Electrical resistivity at 20°C | 0.74 | µΩ·m |
Reference basis: 321H / EN 1.4878 · flat product · typical producer values · temperatures stated in each row · typical values.
High-Temperature Characteristics
Use temperature, sustained stress and exposure time to compare H grades. Do not treat historical code listings as current component approval.
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 | 3 × 1219 × 2438 mm | 2B · Solution annealed | In stock |
| Hot-rolled plate | 4 × 1500 × 6000 mm | No.1 · Solution annealed | In stock |
| Hot-rolled coil | 4 × 1500 mm coil | No.1 · Solution annealed | In stock |
| Seamless pipe | OD 114.3 × 6.02 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 comparisons involve superheater, reheater and other loaded hot-service components under the specified design code.
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.