--- title: "X22CrNi25-20 — Heat resistant steels" description: "X22CrNi25-20 in UNI: material number 1.4845, also listed as X12CrNi25-21. Category: Heat resistant steels. Designations recorded for this grade: 91." canonical: https://steelequivalents.com/materials/uni/x22crni25-20 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/uni/x22crni25-20.md cs: https://steelequivalents.com/cs/materiály/uni/x22crni25-20.md de: https://steelequivalents.com/de/werkstoffe/uni/x22crni25-20.md es: https://steelequivalents.com/es/materiales/uni/x22crni25-20.md fr: https://steelequivalents.com/fr/matériaux/uni/x22crni25-20.md hu: https://steelequivalents.com/hu/anyagok/uni/x22crni25-20.md it: https://steelequivalents.com/it/materiali/uni/x22crni25-20.md nl: https://steelequivalents.com/nl/materialen/uni/x22crni25-20.md pl: https://steelequivalents.com/pl/materiały/uni/x22crni25-20.md pt: https://steelequivalents.com/pt/materiais/uni/x22crni25-20.md ru: https://steelequivalents.com/ru/материалы/uni/x22crni25-20.md tr: https://steelequivalents.com/tr/malzemeler/uni/x22crni25-20.md zh: https://steelequivalents.com/zh/材料/uni/x22crni25-20.md ja: https://steelequivalents.com/ja/材料/uni/x22crni25-20.md ar: https://steelequivalents.com/ar/المواد/uni/x22crni25-20.md ko: https://steelequivalents.com/ko/재료/uni/x22crni25-20.md pt-br: https://steelequivalents.com/pt-br/materiais/uni/x22crni25-20.md hi: https://steelequivalents.com/hi/सामग्री/uni/x22crni25-20.md content_hash: sha256:7d857e8e8df86a25b92ffaf39d972a76d40951b153aa1ff5ec470e76ad3d4553 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/uni/x22crni25-20 > Canonical URL: https://steelequivalents.com/materials/uni/x22crni25-20 > 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. UNI · Italy · 91 designations # X22CrNi25-20 X22CrNi25-20 is a designation in UNI for the material held under material number 1.4845, also listed as X12CrNi25-21. It is a material in the category Heat resistant steels. We list 91 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, UNE, ISO, SAE AMS, JIS, GB, GOST, UNI, SS, ČSN, STN, PN, MSZ, STAS, AS / NZS, BDS and KS. - [*Material no.* **1.4845**](/materials/material-no/1.4845 "Material no.: 1.4845") - [*Category* **Heat resistant steels · 64 grades**](/categories/heat-resistant-steels "Category: Heat resistant steels · 64 grades") - *Designations* **91** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=8715c4c6-ea9e-424b-94f7-c760447663ae&designation=bf7c00ec-e466-4e31-8772-9fd29a712d66 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uni/x22crni25-20.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN X8CrNi25-21 This grade’s own name](/materials/din-en/x8crni25-21 "DIN / EN X8CrNi25-21") - [UNS S31008 This grade’s own name · 4 grades on that route](/materials/uns/s31008 "UNS S31008") - [AISI / SAE 310S This grade’s own name · 5 grades on that route](/materials/aisi-sae/310s "AISI / SAE 310S") ## About Heat resistant steels Heat resistant steels are alloyed materials designed to retain useful mechanical properties and resist oxidation or scaling during service at elevated temperatures. They are used for components in furnaces, boilers, heat exchangers and power-generation equipment exposed to hot gases or sustained heat. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 91 designations · 22 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 · 3 - [1.4845 Indicative](/materials/material-no/1.4845 "DIN / EN 1.4845") - [X12CrNi25-21 This grade’s own name Withdrawn](/materials/din-en/x12crni25-21 "DIN / EN X12CrNi25-21") - [X8CrNi25-21 This grade’s own name](/materials/din-en/x8crni25-21 "DIN / EN X8CrNi25-21") UNS United States · 1 - [S31008 This grade’s own name](/materials/uns/s31008 "UNS S31008") AISI / SAE United States · 10 - [30310S Indicative](/materials/aisi-sae/30310s "AISI / SAE 30310S") - [31 OS Indicative](/materials/aisi-sae/31-os "AISI / SAE 31 OS") - [310 Indicative](/materials/aisi-sae/310 "AISI / SAE 310") - [310 H Indicative](/materials/aisi-sae/310h "AISI / SAE 310 H") - [310S This grade’s own name](/materials/aisi-sae/310s "AISI / SAE 310S") - [314 Indicative](/materials/aisi-sae/314 "AISI / SAE 314") - [S31000 Indicative](/materials/uns/s31000 "AISI / SAE S31000") - [S31008 Indicative](/materials/uns/s31008 "AISI / SAE S31008") - [S31009 Indicative](/materials/uns/s31009 "AISI / SAE S31009") - [S31400 Indicative](/materials/uns/s31400 "AISI / SAE S31400") ASTM United States · 22 - [A1012 Indicative](/materials/astm/a1012 "ASTM A1012") - [A167 Indicative](/materials/astm/a167 "ASTM A167") - [A176 Indicative](/materials/astm/a176 "ASTM A176") - [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") - [A484 Indicative](/materials/astm/a484 "ASTM A484") - [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 · 5 - [310S16 Indicative](/materials/bs/310s16 "BS 310S16") - [310S24 Indicative](/materials/bs/310s24 "BS 310S24") - [310S25 Indicative](/materials/bs/310s25 "BS 310S25") - [310S31 Indicative](/materials/bs/310s31 "BS 310S31") - [X8CrNi25-21 Indicative](/materials/din-en/x8crni25-21 "BS X8CrNi25-21") AFNOR France · 4 - [AF Z12CN25-20 Indicative](/materials/afnor/af-z12cn25-20 "AFNOR AF Z12CN25-20") - [Z12CN2520 Indicative](/materials/afnor/z12cn2520 "AFNOR Z12CN2520") - [Z12CN26-21 Indicative](/materials/afnor/z12cn26-21 "AFNOR Z12CN26-21") - [Z8CN25-20 Indicative](/materials/afnor/z8cn25-20 "AFNOR Z8CN25-20") UNE Spain · 2 - [F.331 Indicative](/materials/une/f-331 "UNE F.331") - [X8CrNi25-21 Indicative](/materials/din-en/x8crni25-21 "UNE X8CrNi25-21") ISO International · 2 - [H16 Indicative](/materials/iso/h16 "ISO H16") - [X6CrNi25-21 Indicative](/materials/uni/x6crni25-21 "ISO X6CrNi25-21") SAE AMS United States / Aerospace · 5 - [5521 Indicative plate sheet strip](/materials/ams/5521 "SAE AMS 5521") - [5572 Indicative tube](/materials/ams/5572 "SAE AMS 5572") - [5577 Indicative tube](/materials/ams/5577 "SAE AMS 5577") - [5651 Indicative bar forging wire](/materials/ams/5651 "SAE AMS 5651") - [7490 Indicative](/materials/ams/7490 "SAE AMS 7490") JIS Japan · 8 - [SUH310 Indicative](/materials/jis/suh310 "JIS SUH310") - [SUS 310S Indicative](/materials/jis/sus310s "JIS SUS 310S") - [SUS 310SFB Indicative](/materials/jis/sus310sfb "JIS SUS 310SFB") - [SUS 310STP Indicative](/materials/jis/sus310stp "JIS SUS 310STP") - [SUS 310TB Indicative](/materials/jis/sus310tb "JIS SUS 310TB") - [SUS Y 310S Indicative](/materials/jis/susy310s "JIS SUS Y 310S") - [SUS310 Indicative](/materials/jis/sus310 "JIS SUS310") - [SUS310STB Indicative](/materials/jis/sus310stb "JIS SUS310STB") GB China · 3 - [0Cr25Ni20 Indicative](/materials/gb/0cr25ni20 "GB 0Cr25Ni20") - [1Cr25Ni20Si2 Indicative](/materials/gb/1cr25ni20si2 "GB 1Cr25Ni20Si2") - [OCr25Ni20 Indicative](/materials/gb/ocr25ni20 "GB OCr25Ni20") GOST Russia / CIS · 7 - [10Ch23N18 Indicative](/materials/gost/10ch23n18 "GOST 10Ch23N18") - [10KH23N18 Indicative](/materials/gost/10kh23n18 "GOST 10KH23N18") - [20Ch23N18 Indicative](/materials/gost/20ch23n18 "GOST 20Ch23N18") - [20KH23N18 Indicative](/materials/gost/20kh23n18 "GOST 20KH23N18") - [20Х23Н18 Indicative](/materials/gost/20kh23n18 "GOST 20Х23Н18") - [Х23Н18 Indicative](/materials/gost/kh23n18 "GOST Х23Н18") - [ЭИ417 Indicative](/materials/gost/ei417 "GOST ЭИ417") UNI Italy · 4 - **X22CrNi25-20 Indicative** - [X6CrNi25-21 Indicative](/materials/uni/x6crni25-21 "UNI X6CrNi25-21") - [X6CrNi25-21KG Indicative](/materials/uni/x6crni25-21kg "UNI X6CrNi25-21KG") - [X6CrNi2520 Indicative](/materials/din-en/x6crni25-20 "UNI X6CrNi2520") SS Sweden · 4 - [2361 Indicative](/materials/ss/2361 "SS 2361") - [2381 Indicative](/materials/ss/2381 "SS 2381") - [7RE10AE Indicative](/materials/ss/7re10ae "SS 7RE10AE") - [8RE10R Indicative](/materials/ss/8re10r "SS 8RE10R") ČSN Czechia · 1 - [17255 Indicative](/materials/csn/17255 "ČSN 17255") STN Slovakia · 1 - [17 255 Indicative](/materials/csn/17255 "STN 17 255") PN Poland · 4 - [G205 Indicative](/materials/pn/g205 "PN G205") - [H23N18 Indicative](/materials/pn/h23n18 "PN H23N18") - [H25N20S2 Indicative](/materials/pn/h25n20s2 "PN H25N20S2") - [H25N21 Indicative](/materials/pn/h25n21 "PN H25N21") MSZ Hungary · 1 - [H9 Indicative](/materials/msz/h9 "MSZ H9") STAS Romania · 1 - [12NiCr250 Indicative](/materials/stas/12nicr250 "STAS 12NiCr250") AS / NZS Australia / New Zealand · 1 - [310S Indicative](/materials/aisi-sae/310s "AS / NZS 310S") BDS Bulgaria · 1 - [Ch23N18 Indicative](/materials/bds/ch23n18 "BDS Ch23N18") KS South Korea · 1 - [STS310S Indicative](/materials/ks/sts310s "KS STS310S") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 8 elements on file · weight % What this alloy is Fe Cr Ni Mn Iron — the balance, never listed by a standard — 50.7 % Cr — 25 % Ni — 20.5 % Mn — 2 % Traces & impurities · 1.8 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.1 | | Si | ≤ 1.5 | | Mn | ≤ 2 | | P | 0.045 | | S | 0.015 | | Cr | 24–26 | | Ni | 19–22 | | N | 0.11 | Carbon Silicon Manganese Phosphorus Sulfur Chromium 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 | ≤0,10 | — | 0.100 | Max | | N | 0,11 | 0.110 | 0.110 | Exact | | Si | ≤1,50 | — | 1.500 | Max | | P | 0,045 | 0.045 | 0.045 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Cr | 24,0-26,0 | 24.000 | 26.000 | Range | | Mn | ≤2,00 | — | 2.000 | Max | | Ni | 19,0-22,0 | 19.000 | 22.000 | Range | 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 Not enough recorded composition to predict a transformation temperature for this grade — missing: Mo. ## Physical & mechanical properties Density 7,9 g/cm³ Exact Weldability weldable with restrictions As published: limited weldability. 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 7 conditions · 43 values By delivery state**Solution annealed** source `steelnumber` | Delivery state | HB | |---|---| | Solution annealed | 192 | By dimension**Quenching 1100 - 1150°C, air** source `splav` | Dimension mm | Rm N/mm² | Re N/mm² | A5% | Z% | |---|---|---|---|---| | Ø 212 x 60 | 500 | 200 | 35 | 50 | By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Rm N/mm² | Re N/mm² | A5% | Z% | |---|---|---|---|---| | Bar, GOST 5949-75 | 490 | 196 | 35 | 50 | By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Rm N/mm² | Re N/mm² | A5% | |---|---|---|---| | Sheet trick, GOST 7350-77 | 540 | 265 | 35 | By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Rm N/mm² | Re N/mm² | A5% | |---|---|---|---| | Sheet thin, GOST 5582-75 | 510 | 245 | 35 | By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Rm N/mm² | A5% | |---|---|---| | Sheet thin, GOST 4986-79 | 570 | 19 – 38 | At temperature**no delivery state stated** source `splav` | Temperature °C | Density g/cm³ | Elastic modulus GPa | Thermal expansion coefficient 10^-6/K | Thermal conductivity W/(m·K) | Specific heat capacity J/(kg·K) | Electrical resistivity nΩ·m | |---|---|---|---|---|---|---| | 20 | 7.9 | 204 | — | 13.8 | — | 1000 | | 100 | — | — | 14.9 | 15.9 | 538 | — | | 200 | — | — | 15.7 | — | — | — | | 300 | — | 186 | 16.6 | 18.8 | — | — | | 400 | 7.76 | 180 | 17.3 | — | — | — | | 500 | 7.72 | 173 | 17.5 | — | — | — | | 600 | 7.67 | 163 | 17.85 | 21.7 | — | — | | 700 | 7.62 | 153 | 17.85 | — | — | — | | 800 | — | 144 | — | — | — | — | | 900 | 7.54 | — | — | — | — | — | 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. [X15CrNiSi25-21 1.4841 Cr 24,0-26,0 · Ni 19,0-22,0 - ΔCr 0.00 - ΔNi 0.00 - 60 designations](/materials/din-en/x15crnisi25-21 "X15CrNiSi25-21")[X6CrNi25-20 1.4951 Cr 24,0-26,0 · Ni 19,0-22,0 - ΔCr 0.00 - ΔNi 0.00 - 34 designations](/materials/din-en/x6crni25-20 "X6CrNi25-20") ## 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=8715c4c6-ea9e-424b-94f7-c760447663ae&designation=bf7c00ec-e466-4e31-8772-9fd29a712d66 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uni/x22crni25-20.pdf "Datasheet as PDF")