Grade dossier
410S Stainless Steel
410S stainless steel is a low-carbon, non-hardening ferritic chromium grade identified as UNS S41008. Its strongest procurement case is fabrication that needs the corrosion and oxidation behavior of a 12–13% chromium stainless steel without the heat-treatment hardenability of standard 410, especially for elevated-temperature fixtures and chemical-processing equipment.
Identity before substitution
Specify 410S by grade, product form and delivered condition
410S is related to Type 410 but it is purchased for different metallurgical behavior. The lower carbon limit and producer controls that restrict austenite formation allow the alloy to remain substantially ferritic and non-hardening after rapid cooling from elevated temperature. The purchase order should still name the product standard, dimensions, condition, finish, certification and service environment.
410S stainless composition
ASTM A240/A240M flat-product chemistry for UNS S41008
Use specification limits, not a mill's typical heat
ATI publishes the ASTM A240 limits below for 410S plate, sheet and strip. Some producers use additional melt-practice controls to maintain the non-hardening behavior, but those producer-specific additions should not be written into the purchase order unless the governing specification or application requires them.
| C | 0.08 max |
|---|---|
| Mn | 1.00 max |
| Si | 1.00 max |
| P | 0.040 max |
| S | 0.030 max |
| Cr | 11.5–13.5 |
| Ni | 0.60 max |
| Fe | Balance |
410S stainless properties
Separate ASTM A240 minimums from manufacturer typical values
ASTM A240 plate, sheet and strip requirements
| Tensile strength | 415 MPa min |
|---|---|
| 0.2% yield strength | 205 MPa min |
| Elongation | 22% min* |
| Hardness | 89 HRB / 183 HBW max |
Published mill indicators
| Typical UTS | 462 MPa |
|---|---|
| Typical 0.2% YS | 283 MPa |
| Typical elongation | 27% |
| Density | about 7.73–7.75 g/cm³ |
*ATI notes a 20% minimum elongation for sheet or strip 0.050 in. (1.27 mm) and under. The typical mechanical values above are Cleveland-Cliffs published examples, not acceptance values for every heat. Use the current ASTM edition and the actual mill test certificate for order acceptance.
Selection boundary
Where 410S is useful—and where the application needs a different grade
410S is selected for its non-hardening ferritic behavior, moderate corrosion resistance and useful oxidation resistance, not because it is a universal substitute for 410 or higher-alloy stainless steels. Review temperature, atmosphere, chlorides, acids, weld condition, surface requirements and required strength together.
Good reasons to evaluate 410S
Annealing boxes, quenching racks and high-temperature partitions where cooling without hardening is valuable.
Chemical-processing equipment such as distillation-tower or separator components after media review.
Blanked, bent, roll-formed or moderately drawn parts that benefit from a ferritic flat product.
General 12–13% chromium service where corrosion is not severe and heat-treatment hardening is not wanted.
Stop and review these constraints
Highly acidic service can produce high uniform corrosion rates; do not select 410S from grade name alone.
Neutral chloride exposure can pit the surface, so it is a poor default where appearance must remain critical.
If the design needs hardening by heat treatment or martensitic strength, compare with standard 410 or another hardenable grade.
As-welded heat-affected zones require review for sensitization and brittle-fracture risk; welding procedure matters.
Fabrication route
Fabricate 410S around ferritic welding behavior and controlled annealing
410S is used for blanking, bending, roll forming and moderate drawing; final bend radius and forming route still depend on thickness and condition.
Common fusion and resistance welding processes can be used, but discontinuities and excessive thermal severity should be controlled to reduce brittle weld-fracture risk.
When filler is required, published guidance includes 430- or 309L-family consumables; the qualified WPS and service requirement must control the final choice.
410S is not hardenable by heat treatment. Cleveland-Cliffs gives an annealing reference of 871–899°C followed by air cooling and cautions against unnecessary exposure at about 1093°C or above.
410S stainless supplier checklist
Use published mill forms as a sourcing reference, then confirm actual stock and certification
A 410S stainless supplier should confirm the exact product form, standard, thickness, width or diameter, finish, edge or end condition, quantity, inspection and MTC requirements. The ranges below are attributable mill-source references and should not be read as a claim of current inventory on this website.
ATI: ASTM A240 plate, sheet and strip
Outokumpu: cold rolled coil, strip and sheet
Outokumpu: hot rolled coil, strip, plate and quarto plate
Cleveland-Cliffs reference: 0.38–3.43 mm thick, widths up to 1219 mm
MTC checkpoint before release
Verify heat number and traceability, 410S / UNS S41008 designation, governing specification and edition, heat analysis, tensile and yield results, elongation, hardness where required, dimensions, condition and any supplementary inspection. Heat-specific certification controls acceptance; a web datasheet does not.
Interactive procurement check
Test 410S against the controlling design question
Procurement FAQ
Questions to close before ordering 410S stainless steel
Is 410S stainless steel the same as 410?
No. 410S is the low-carbon, non-hardening modification identified as UNS S41008. Standard 410 is selected when martensitic hardening and higher heat-treated strength are required.
Is 410S ferritic or martensitic?
Major producer datasheets classify 410S as ferritic, and Cleveland-Cliffs describes it as completely ferritic in the annealed condition. It is related to the 410 family but should not be purchased as if it had standard 410 hardenability.
Can 410S be hardened by heat treatment?
No. Its defining behavior is resistance to hardening on cooling from elevated temperature. Strength can still vary with product form, processing and cold work, so the delivered condition must be stated.
What ASTM A240 mechanical values should be checked?
For 410S flat product, ATI lists 415 MPa minimum tensile strength, 205 MPa minimum 0.2% yield strength, 22% minimum elongation and 89 HRB maximum hardness; thin sheet or strip at 1.27 mm and under has a 20% minimum elongation note.
What should a 410S RFQ include?
State product form, ASTM or EN standard and edition, UNS S41008 or the required EN designation, dimensions and tolerances, finish, quantity, operating temperature and medium, fabrication route, MTC requirement and supplementary inspection.
Sources, scope and RFQ
Trace the 410S grade data, then request heat-specific certification
UNS S41008 composition, ASTM A240 plate/sheet/strip requirements, density and minimum mechanical properties.
Non-hardening behavior, published typical mechanical values, reference dimensions, corrosion and oxidation guidance, welding and annealing notes.
Ferritic classification, EN 1.4000 cross-reference, UNS S41008 identity and available flat-product forms.
Use the current purchase-order edition for plate, sheet and strip acceptance; product-form standards can change required tests and limits.