Data completeness: partial. Last verified 19 August 2026.
Designations
| Common name | 410 |
| UNS | S41000 |
| EN number | 1.4006 |
| Class | Martensitic stainless steel |
| Specified by | EN 10088-2 |
410 is the first hardenable steel on this site and it breaks the pattern the other pages follow, in two ways worth saying before any number appears. Its properties are set by heat treatment, not by composition — the same bar can be soft or hard depending on what was done to it — and every figure below is an Outokumpu typical value, not a specified minimum, because the datasheet it comes from says so in its own table caption. Those two facts together mean these numbers describe steel as delivered, not steel in service.
Properties, with what each one rests on
| Property | Value | Unit | Condition | Evidence | Source | Retrieved |
|---|---|---|---|---|---|---|
| Proof strength Rp0.2, typical | 340 | MPa | wire rod; heat treatment condition not stated by the source | E3 | Outokumpu Dura range datasheet — martensitic and precipitation hardening stainless steels | 2026-08-20 |
| Proof strength Rp0.2, typical (bar) | 500 | MPa | bar; heat treatment condition not stated by the source | E3 | Outokumpu Dura range datasheet — martensitic and precipitation hardening stainless steels | 2026-08-20 |
| Tensile strength Rm, typical | 580 | MPa | wire rod; heat treatment condition not stated by the source | E3 | Outokumpu Dura range datasheet — martensitic and precipitation hardening stainless steels | 2026-08-20 |
| Elongation A, typical | 30 | % | wire rod; heat treatment condition not stated by the source | E3 | Outokumpu Dura range datasheet — martensitic and precipitation hardening stainless steels | 2026-08-20 |
| Density | 7.7 | g/cm³ | 20 °C | E3 | Outokumpu Dura range datasheet — martensitic and precipitation hardening stainless steels | 2026-08-20 |
| Modulus of elasticity | 215 | GPa | 20 °C | E3 | Outokumpu Dura range datasheet — martensitic and precipitation hardening stainless steels | 2026-08-20 |
| Thermal conductivity | 30 | W/(m·K) | 20 °C | E3 | Outokumpu Dura range datasheet — martensitic and precipitation hardening stainless steels | 2026-08-20 |
| Heat treatment condition for every mechanical row | not established | — | — | — | the datasheet prints product form but no condition, and for a hardenable steel the condition is the property | — |
| Hardness | not established | — | — | — | the hardness column is empty for every grade in the datasheet consulted, and for a martensitic grade it is the value most often specified | — |
| Specified minima | not established | — | — | — | the datasheet states its figures are typical values; no standard was opened for this grade | — |
| PREN | not established | — | — | — | the Dura datasheet prints no PRE column, and computing one from the formula a different Outokumpu datasheet uses would import a method this document does not apply | — |
7 sourced values, 4 gaps named. Publishing the gaps is more useful than filling them from an aggregator that does not say where its numbers came from. The routes to filling them are the standard itself, a mill datasheet, or a mill certificate for your actual heat — which supersedes both at E5.
Where the numbers come from
Proof strength Rp0.2, typical. A typical value from a mill datasheet, so it is what production tends to produce, not a floor anyone guarantees. The bar row for the same grade is 500 MPa — 47% higher, same composition, same document. Product form is doing all of that work, and neither row names a heat treatment.
Elongation A, typical. Against 9% on the bar row. A martensitic steel trades ductility for strength across heat treatments, and this pair of rows in one datasheet is that trade shown twice.
Modulus of elasticity. Higher than any austenitic in this data set, and unlike strength it is not changed by heat treatment. If a part is stiffness-driven rather than strength-driven, this is the number that matters and it is the one a hardening cycle will not move.
Thermal conductivity. Twice any austenitic in this data set. Martensitic and ferritic stainless steels conduct heat far better than austenitic ones, which is why they turn up in cutlery, valves and anything that has to shed heat.
Why we do not just copy an aggregator. Because then this page would be a worse copy of MatWeb with no way for you to tell which rows to trust, and the one thing we have that MatWeb does not is the evidence column. Our coverage and its limits.
What 410 is usually chosen for
Parts that must be hard and are not asked to resist much. Valve components, pump shafts, fasteners, turbine blades, cutlery and wear surfaces. At 12% chromium it is the cheapest thing that can be called stainless and then hardened, and hardenability is the entire proposition — no austenitic can be heat treated to a useful hardness at all.
And what it is usually rejected for
Corrosion and welding. Twelve percent chromium with no molybdenum is the minimum that counts as stainless, and it rusts in chlorides and in anything acidic; the hardened condition makes it worse, not better. It also hardens in the weld heat-affected zone and cracks unless preheated and post-weld tempered, so welded construction in it is specialist work.
The number to be more careful with than any of the above is the difference between a specified minimum and a typical value — a floor the standard guarantees, versus what a supplier’s production usually does. The full version, and the most expensive routine mistake in material data.
Compare
What this page does not cover
- No heat treatment condition on any row, which for a hardenable steel means the numbers describe delivery, not service.
- No hardness values, which is what this grade is usually bought against.
- No specified minima. Everything here is a mill typical value and cannot be used as a design allowable.
- No corrosion data at all, and this is the least corrosion resistant family on the site.
- Welding, preheat and tempering practice.
Generated from data/materials/410.yaml. Regenerate rather than editing this file by hand — edits here are lost on the next build.