--- title: "S31002 — Stainless steels" description: "S31002 in UNS: material number 1.4335, also listed as X1CrNi25-21. Category: Stainless steels. Designations recorded for this grade: 36." canonical: https://steelequivalents.com/materials/uns/s31002 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/uns/s31002.md cs: https://steelequivalents.com/cs/materiály/uns/s31002.md de: https://steelequivalents.com/de/werkstoffe/uns/s31002.md es: https://steelequivalents.com/es/materiales/uns/s31002.md fr: https://steelequivalents.com/fr/matériaux/uns/s31002.md hu: https://steelequivalents.com/hu/anyagok/uns/s31002.md it: https://steelequivalents.com/it/materiali/uns/s31002.md nl: https://steelequivalents.com/nl/materialen/uns/s31002.md pl: https://steelequivalents.com/pl/materiały/uns/s31002.md pt: https://steelequivalents.com/pt/materiais/uns/s31002.md ru: https://steelequivalents.com/ru/материалы/uns/s31002.md tr: https://steelequivalents.com/tr/malzemeler/uns/s31002.md zh: https://steelequivalents.com/zh/材料/uns/s31002.md ja: https://steelequivalents.com/ja/材料/uns/s31002.md ar: https://steelequivalents.com/ar/المواد/uns/s31002.md ko: https://steelequivalents.com/ko/재료/uns/s31002.md pt-br: https://steelequivalents.com/pt-br/materiais/uns/s31002.md hi: https://steelequivalents.com/hi/सामग्री/uns/s31002.md content_hash: sha256:7dd8b2c16589b17d57c0cb6673b2a8d4d5e6e1903570ec88df7edd4512af3483 generated: 2026-09-22 --- > **Machine-readable Markdown rendering.** This is a Markdown representation of a web page, > served for AI agents and crawlers as a token-efficient alternative to the full HTML. > Full interactive HTML version: https://steelequivalents.com/materials/uns/s31002 > Canonical URL: https://steelequivalents.com/materials/uns/s31002 > Available languages: en, cs, de, es, fr, hu, it, nl, pl, pt, ru, tr, zh, ja, ar, ko, pt-br, hi > Change detection: `content_hash` is the SHA-256 of this document's Markdown body — everything > below this block, whitespace-trimmed, excluding the front-matter. Compare it to detect a real > content change; `generated` moves on every render and is not a change signal. UNS · United States · 36 designations # S31002 S31002 is a designation in UNS for the material held under material number 1.4335, also listed as X1CrNi25-21. It is a material in the category Stainless steels. We list 36 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, ISO, SAE AMS, JIS and GB. - [*Material no.* **1.4335**](/materials/material-no/1.4335 "Material no.: 1.4335") - [*Category* **Stainless steels · 468 grades**](/categories/stainless-steels "Category: Stainless steels · 468 grades") - *Designations* **36** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=3bf90248-ced0-4d2a-a52d-76f47861439f&designation=1edcce19-8bd9-408b-8f70-dfec39b94a1e "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uns/s31002.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN X1CrNi25-21 This grade’s own name](/materials/din-en/x1crni25-21 "DIN / EN X1CrNi25-21") ## About Stainless steels Stainless steels are corrosion-resistant alloy steels whose chromium content promotes a protective passive surface film. They are used for equipment, structures and components exposed to moisture, chemicals or hygienic service, with different alloy compositions selected for corrosion resistance, strength, formability or weldability. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 36 designations · 10 standards · nothing hidden This grade’s own name recorded in our sources as this grade’s own designation under that standard. Indicative taken from a published cross-reference table; a close match, not a guarantee of interchangeability. Verify against the mill certificate before ordering. Withdrawn designation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once. DIN / EN Europe · 1 - [X1CrNi25-21 This grade’s own name](/materials/din-en/x1crni25-21 "DIN / EN X1CrNi25-21") UNS United States · 2 - **S31002 This grade’s own name** - [S31008 Indicative](/materials/uns/s31008 "UNS S31008") AISI / SAE United States · 2 - [30310S Indicative](/materials/aisi-sae/30310s "AISI / SAE 30310S") - [310S Indicative](/materials/aisi-sae/310s "AISI / SAE 310S") ASTM United States · 20 - [310L NAG Indicative](/materials/astm/310l-nag "ASTM 310L NAG") - [A1012 Indicative](/materials/astm/a1012 "ASTM A1012") - [A213 Indicative](/materials/astm/a213 "ASTM A213") - [A240 Indicative](/materials/astm/a240 "ASTM A240") - [A249 Indicative](/materials/astm/a249 "ASTM A249") - [A264 Indicative](/materials/astm/a264 "ASTM A264") - [A276 Indicative](/materials/astm/a276 "ASTM A276") - [A312 Indicative](/materials/astm/a312 "ASTM A312") - [A314 Indicative](/materials/astm/a314 "ASTM A314") - [A358 Indicative](/materials/astm/a358 "ASTM A358") - [A409 Indicative](/materials/astm/a409 "ASTM A409") - [A473 Indicative](/materials/astm/a473 "ASTM A473") - [A479 Indicative](/materials/astm/a479 "ASTM A479") - [A511 Indicative](/materials/astm/a511 "ASTM A511") - [A554 Indicative](/materials/astm/a554 "ASTM A554") - [A580 Indicative](/materials/astm/a580 "ASTM A580") - [A813 Indicative](/materials/astm/a813 "ASTM A813") - [A814 Indicative](/materials/astm/a814 "ASTM A814") - [A924 Indicative](/materials/astm/a924 "ASTM A924") - [A943 Indicative](/materials/astm/a943 "ASTM A943") BS United Kingdom · 2 - [310S31 Indicative](/materials/bs/310s31 "BS 310S31") - [310S94 Indicative](/materials/bs/310s94 "BS 310S94") AFNOR France · 1 - [Z1CN25-20 Indicative](/materials/afnor/z1cn25-20 "AFNOR Z1CN25-20") ISO International · 1 - [X6CrNi25-21 Indicative](/materials/uni/x6crni25-21 "ISO X6CrNi25-21") SAE AMS United States / Aerospace · 5 - [5521 Indicative](/materials/ams/5521 "SAE AMS 5521") - [5572 Indicative](/materials/ams/5572 "SAE AMS 5572") - [5577 Indicative](/materials/ams/5577 "SAE AMS 5577") - [5651 Indicative](/materials/ams/5651 "SAE AMS 5651") - [7490 Indicative](/materials/ams/7490 "SAE AMS 7490") JIS Japan · 1 - [SUS 310S Indicative](/materials/jis/sus310s "JIS SUS 310S") GB China · 1 - [0Cr25Ni20 Indicative](/materials/gb/0cr25ni20 "GB 0Cr25Ni20") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 9 elements on file · weight % What this alloy is Fe Cr Ni Mn Iron — the balance, never listed by a standard — 51.4 % Cr — 25 % Ni — 21 % Mn — 2 % Traces & impurities · 0.6 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.02 | | Si | ≤ 0.25 | | Mn | ≤ 2 | | P | 0.025 | | S | 0.01 | | Cr | 24–26 | | Mo | ≤ 0.2 | | Ni | 20–22 | | N | 0.11 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Nitrogen 0.01 % 0.1 % 1 % 10 % 100 % The scale is logarithmic, not the element’s raw share of the alloy — the only honest way to fit 0.01 % and 100 % in one picture, and it means every value here can be compared with every other. | Element | As published source text, verbatim | Min% by weight | Max% by weight | Bound | |---|---|---|---|---| | C | ≤0,020 | — | 0.020 | Max | | N | 0,11 | 0.110 | 0.110 | Exact | | Si | ≤0,25 | — | 0.250 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,01 | 0.010 | 0.010 | Exact | | Cr | 24,0-26,0 | 24.000 | 26.000 | Range | | Mn | ≤2,00 | — | 2.000 | Max | | Ni | 20,0-22,0 | 20.000 | 22.000 | Range | | Mo | ≤0,20 | — | 0.200 | Max | The published column is the source string byte-for-byte, decimal comma and all; Min and Max are the parsed bounds. Elements not listed have no value on file — they are omitted, never inferred. ## Predicted transformation temperatures This grade's composition falls outside the published model's validated range (a low-alloy composition window), so no transformation temperature is predicted here. ## Physical & mechanical properties Density 7,85 g/cm³ Exact An absent property means we hold no value for it — it is left out rather than estimated, interpolated from a neighbouring grade, or filled from a handbook. It does not mean the property is undefined for the material. ## Properties by condition 1 conditions · 1 values By delivery state**Solution annealed** source `steelnumber` | Delivery state | HB | |---|---| | Solution annealed | 220 | Every figure holds only for the condition on its own row. Values are never merged across conditions or across sources, never averaged, and never interpolated between two rows. An em dash means no value on file — never zero. Figures are converted to the unit in the column header; the source’s own wording is kept and shown where the two differ. ## Similar grades — and why Selection rule, stated so you can disagree with it: same number class 1.4, a shared category, and a published range for Cr / Ni that overlaps this grade’s. These are neighbours in composition space — they are not equivalents, and none is claimed to be interchangeable with this grade. [X1CrNiMoN25-22-2 1.4466 Cr 24,0-26,0 · Ni 21,0-23,0 - ΔCr 0.00 - ΔNi 1.00 - 9 designations](/materials/din-en/x1crnimon25-22-2 "X1CrNiMoN25-22-2")[X1CrNiMoN25-25-2 1.4465 Cr 24,0-26,0 · Ni 22,0-25,0 - ΔCr 0.00 - ΔNi 2.50 - 4 designations](/materials/din-en/x1crnimon25-25-2 "X1CrNiMoN25-25-2") ## Looking for this grade under another name? Search the catalogue by designation, material number or composition — every name on this page is itself a way in. [Search](/search "Steel grade search")[Inquiry](/inquiry?material=3bf90248-ced0-4d2a-a52d-76f47861439f&designation=1edcce19-8bd9-408b-8f70-dfec39b94a1e "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uns/s31002.pdf "Datasheet as PDF")