--- title: "S43023 — Heat resistant steels" description: "S43023 in UNS: material number 1.4828, also listed as X15CrNiSi20-12. Category: Heat resistant steels. Designations recorded for this grade: 77." canonical: https://steelequivalents.com/materials/uns/s43023 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/uns/s43023.md cs: https://steelequivalents.com/cs/materiály/uns/s43023.md de: https://steelequivalents.com/de/werkstoffe/uns/s43023.md es: https://steelequivalents.com/es/materiales/uns/s43023.md fr: https://steelequivalents.com/fr/matériaux/uns/s43023.md hu: https://steelequivalents.com/hu/anyagok/uns/s43023.md it: https://steelequivalents.com/it/materiali/uns/s43023.md nl: https://steelequivalents.com/nl/materialen/uns/s43023.md pl: https://steelequivalents.com/pl/materiały/uns/s43023.md pt: https://steelequivalents.com/pt/materiais/uns/s43023.md ru: https://steelequivalents.com/ru/материалы/uns/s43023.md tr: https://steelequivalents.com/tr/malzemeler/uns/s43023.md zh: https://steelequivalents.com/zh/材料/uns/s43023.md ja: https://steelequivalents.com/ja/材料/uns/s43023.md ar: https://steelequivalents.com/ar/المواد/uns/s43023.md ko: https://steelequivalents.com/ko/재료/uns/s43023.md pt-br: https://steelequivalents.com/pt-br/materiais/uns/s43023.md hi: https://steelequivalents.com/hi/सामग्री/uns/s43023.md content_hash: sha256:0ef4f6401dc6ec68672a0dbd84f18665608f640f85b7f58cf05b2ab6ac3dd728 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/s43023 > Canonical URL: https://steelequivalents.com/materials/uns/s43023 > 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 · 77 designations # S43023 S43023 is a designation in UNS for the material held under material number 1.4828, also listed as X15CrNiSi20-12. It is a material in the category Heat resistant steels. We list 77 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, UNE, SAE AMS, JIS, GB, GOST, UNI, ČSN, STN, SRPS, JUS, PN, MSZ, STAS, BDS and KS. - [*Material no.* **1.4828**](/materials/material-no/1.4828 "Material no.: 1.4828") - [*Category* **Heat resistant steels · 64 grades**](/categories/heat-resistant-steels "Category: Heat resistant steels · 64 grades") - *Designations* **77** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=1500d6cd-a1f2-47b9-8860-2a93887d8e32&designation=a01569e4-fe28-4dca-b69c-b15ad4aaa90b "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uns/s43023.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN X15CrNiSi20-12 This grade’s own name](/materials/din-en/x15crnisi20-12 "DIN / EN X15CrNiSi20-12") - [AFNOR Z17CNS20 This grade’s own name](/materials/afnor/z17cns20 "AFNOR Z17CNS20") ## 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 77 designations · 21 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 · 2 - [1.4828 Indicative](/materials/material-no/1.4828 "DIN / EN 1.4828") - [X15CrNiSi20-12 This grade’s own name](/materials/din-en/x15crnisi20-12 "DIN / EN X15CrNiSi20-12") UNS United States · 4 - [S20500 Indicative](/materials/uns/s20500 "UNS S20500") - [S30900 Indicative](/materials/uns/s30900 "UNS S30900") - [S41400 Indicative](/materials/uns/s41400 "UNS S41400") - **S43023 Indicative** AISI / SAE United States · 9 - [205 Indicative](/materials/is/205 "AISI / SAE 205") - [30309 Indicative](/materials/aisi-sae/30309 "AISI / SAE 30309") - [309 Indicative](/materials/aisi-sae/309 "AISI / SAE 309") - [3U8 Indicative](/materials/aisi-sae/3u8 "AISI / SAE 3U8") - [414 Indicative](/materials/aisi-sae/414 "AISI / SAE 414") - [430FSe Indicative](/materials/aisi-sae/430fse "AISI / SAE 430FSe") - [51414 Indicative](/materials/aisi-sae/51414 "AISI / SAE 51414") - [S30900 Indicative](/materials/uns/s30900 "AISI / SAE S30900") - [XM-15 Indicative](/materials/aisi-sae/xm-15 "AISI / SAE XM-15") ASTM United States · 17 - [A167 Indicative](/materials/astm/a167 "ASTM A167") - [A264 Indicative](/materials/astm/a264 "ASTM A264") - [A276 Indicative](/materials/astm/a276 "ASTM A276") - [A314 Indicative](/materials/astm/a314 "ASTM A314") - [A403 Indicative](/materials/astm/a403 "ASTM A403") - [A409 Indicative](/materials/astm/a409 "ASTM A409") - [A473 Indicative](/materials/astm/a473 "ASTM A473") - [A479 Indicative](/materials/astm/a479 "ASTM A479") - [A480 Indicative](/materials/astm/a480 "ASTM A480") - [A484 Indicative](/materials/astm/a484 "ASTM A484") - [A511 Indicative](/materials/astm/a511 "ASTM A511") - [A580 Indicative](/materials/astm/a580 "ASTM A580") - [A581 Indicative](/materials/astm/a581 "ASTM A581") - [A582 Indicative](/materials/astm/a582 "ASTM A582") - [A666 Indicative](/materials/astm/a666 "ASTM A666") - [A895 Indicative](/materials/astm/a895 "ASTM A895") - [F2281 Indicative](/materials/astm/f2281 "ASTM F2281") BS United Kingdom · 3 - [305S19 Indicative](/materials/bs/305s19 "BS 305S19") - [309S24 Indicative](/materials/bs/309s24 "BS 309S24") - [X15CrNiSi20-12 Indicative](/materials/din-en/x15crnisi20-12 "BS X15CrNiSi20-12") AFNOR France · 9 - [308F80 Indicative](/materials/afnor/308f80 "AFNOR 308F80") - [Z10CNS20-12 Indicative](/materials/afnor/z10cns20-12 "AFNOR Z10CNS20-12") - [Z10CNS25-20 Indicative](/materials/afnor/z10cns25-20 "AFNOR Z10CNS25-20") - [Z15CN24-13 Indicative](/materials/afnor/z15cn24-13 "AFNOR Z15CN24-13") - [Z15CNS20.10 Indicative](/materials/afnor/z15cns20-10 "AFNOR Z15CNS20.10") - [Z15CNS20.12 Indicative](/materials/afnor/z15cns20-12 "AFNOR Z15CNS20.12") - [Z17CNS20 This grade’s own name](/materials/afnor/z17cns20 "AFNOR Z17CNS20") - [Z17CNS20-12 Indicative](/materials/afnor/z17cns20-12 "AFNOR Z17CNS20-12") - [Z9CN24-13 Indicative](/materials/afnor/z9cn24-13 "AFNOR Z9CN24-13") UNE Spain · 2 - [F.3312 Indicative](/materials/une/f-3312 "UNE F.3312") - [X15CrNiSi20-12 Indicative](/materials/din-en/x15crnisi20-12 "UNE X15CrNiSi20-12") SAE AMS United States / Aerospace · 3 - [5523 Indicative plate sheet strip](/materials/ams/5523 "SAE AMS 5523") - [5574 Indicative tube](/materials/ams/5574 "SAE AMS 5574") - [5650 Indicative bar forging tube](/materials/ams/5650 "SAE AMS 5650") JIS Japan · 3 - [SUH 309 Indicative](/materials/jis/suh-309 "JIS SUH 309") - [SUH 309TB Indicative](/materials/jis/suh-309tb "JIS SUH 309TB") - [SUH 309TP Indicative](/materials/jis/suh-309tp "JIS SUH 309TP") GB China · 3 - [1Cr20Ni14Si2 Indicative](/materials/gb/1cr20ni14si2 "GB 1Cr20Ni14Si2") - [1Cr23Ni13 Indicative](/materials/gb/1cr23ni13 "GB 1Cr23Ni13") - [2Cr23Ni13 Indicative](/materials/gb/2cr23ni13 "GB 2Cr23Ni13") GOST Russia / CIS · 9 - [08KH20N14S2 Indicative](/materials/gost/08kh20n14s2 "GOST 08KH20N14S2") - [08Х20Н14С2 Indicative](/materials/gost/08kh20n14s2 "GOST 08Х20Н14С2") - [0Х20Н14С2 Indicative](/materials/gost/0kh20n14s2 "GOST 0Х20Н14С2") - [20Ch20N14S2 Indicative](/materials/gost/20ch20n14s2 "GOST 20Ch20N14S2") - [20KH20N14S2 Indicative](/materials/gost/20kh20n14s2 "GOST 20KH20N14S2") - [20Х20Н14С2 Indicative](/materials/gost/20kh20n14s2 "GOST 20Х20Н14С2") - [Х20Н14С2 Indicative](/materials/gost/kh20n14s2 "GOST Х20Н14С2") - [ЭИ211 Indicative](/materials/gost/ei211 "GOST ЭИ211") - [ЭИ732 Indicative](/materials/gost/ei732 "GOST ЭИ732") UNI Italy · 2 - [X16CrNi23-14 Indicative](/materials/uni/x16crni23-14 "UNI X16CrNi23-14") - [X6CrNi2520 Indicative](/materials/din-en/x6crni25-20 "UNI X6CrNi2520") ČSN Czechia · 2 - [17251 Indicative](/materials/csn/17251 "ČSN 17251") - [17256VN Indicative](/materials/csn/17256vn "ČSN 17256VN") STN Slovakia · 1 - [17 251 Indicative](/materials/csn/17251 "STN 17 251") SRPS Serbia · 1 - [Č.4577 Indicative](/materials/srps/c-4577 "SRPS Č.4577") JUS former Yugoslavia · 1 - [Č.4577 Indicative](/materials/srps/c-4577 "JUS Č.4577") PN Poland · 2 - [H18N9S Indicative](/materials/pn/h18n9s "PN H18N9S") - [H20N12S2 Indicative](/materials/pn/h20n12s2 "PN H20N12S2") MSZ Hungary · 1 - [H8 Indicative](/materials/msz/h8 "MSZ H8") STAS Romania · 1 - [15SiNiCr200 Indicative](/materials/stas/15sinicr200 "STAS 15SiNiCr200") BDS Bulgaria · 1 - [Ch20N14S2 Indicative](/materials/bds/ch20n14s2 "BDS Ch20N14S2") KS South Korea · 1 - [STR309 Indicative](/materials/ks/str309 "KS STR309") 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 Si Iron — the balance, never listed by a standard — 63.6 % Cr — 20 % Ni — 12 % Si — 2 % Traces & impurities · 2.4 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.2 | | Si | 1.5–2.5 | | Mn | ≤ 2 | | P | 0.045 | | S | 0.015 | | Cr | 19–21 | | Ni | 11–13 | | 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 | ≤0,20 | — | 0.200 | Max | | N | 0,11 | 0.110 | 0.110 | Exact | | Si | 1,50-2,50 | 1.500 | 2.500 | Range | | P | 0,045 | 0.045 | 0.045 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Cr | 19,0-21,0 | 19.000 | 21.000 | Range | | Mn | ≤2,00 | — | 2.000 | Max | | Ni | 11,0-13,0 | 11.000 | 13.000 | 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 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 5 conditions · 45 values By delivery state**no delivery state stated** source `steeljis` | Delivery state | Rm N/mm² | Re N/mm² | A% | Z% | HB | HRB | HV | |---|---|---|---|---|---|---|---| | Bars/Rods Solution treatment | 560 | 205 | 45 | 50 | — | — | — | | Solution treatment | — | — | — | — | 201 | 95 | 210 | By delivery state**Solution annealed** source `steelnumber` | Delivery state | HB | |---|---| | Solution annealed | 223 | By dimension**Quenching 1000 - 1150°C, air** source `splav` | Dimension mm | Rm N/mm² | Re N/mm² | A5% | Z% | |---|---|---|---|---| | Ø 60 | 590 | 295 | 35 | 55 | By delivery state**no delivery state stated** source `splav` | Delivery state | Rm N/mm² | A5% | |---|---|---| | Sheet thin, GOST 5582-75 | 590 | 40 | At temperature**no delivery state stated** source `splav` | Temperature °C | Density g/cm³ | Thermal expansion coefficient 10^-6/K | Thermal conductivity W/(m·K) | Electrical resistivity nΩ·m | |---|---|---|---|---| | 20 | 7.8 | — | — | 946 | | 100 | 7.76 | 16 | 15 | 1000 | | 200 | — | — | 17 | 1051 | | 300 | — | — | 18 | 1095 | | 400 | — | — | 19 | 1130 | | 500 | — | — | 21 | 1100 | | 600 | 7.55 | 18.1 | 23 | 1194 | | 700 | 7.51 | 18.3 | 24 | 1218 | | 800 | 7.47 | 18.5 | 26 | 1242 | | 900 | 7.42 | 18.8 | 28 | 1242 | | 1000 | — | 19 | — | — | 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. [X7CrNiSiNCe21-11 1.4835 Cr 20,0-22,0 · Ni 10,0-12,0 - ΔCr 1.00 - ΔNi 1.00 - 12 designations](/materials/din-en/x7crnisince21-11 "X7CrNiSiNCe21-11")[X 8 CrNiSiN 21 11 1.4893 Cr 21 · Ni 11 - ΔCr 1.00 - ΔNi 1.00 - 3 designations](/materials/din-en/x-8-crnisin-21-11 "X 8 CrNiSiN 21 11")[1.4878 1.4878 Cr 17,0-19,0 · Ni 9,00-12,0 - ΔCr 2.00 - ΔNi 1.50 - 63 designations](/materials/material-no/1.4878 "1.4878") ## 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=1500d6cd-a1f2-47b9-8860-2a93887d8e32&designation=a01569e4-fe28-4dca-b69c-b15ad4aaa90b "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uns/s43023.pdf "Datasheet as PDF")