--- title: "J93633 — Heat-resistant cast steels" description: "J93633 in UNS: material number 1.4837, also listed as GX40CrNiSi25-12. Category: Heat-resistant cast steels. Designations recorded for this grade: 20." canonical: https://steelequivalents.com/materials/uns/j93633 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/uns/j93633.md cs: https://steelequivalents.com/cs/materiály/uns/j93633.md de: https://steelequivalents.com/de/werkstoffe/uns/j93633.md es: https://steelequivalents.com/es/materiales/uns/j93633.md fr: https://steelequivalents.com/fr/matériaux/uns/j93633.md hu: https://steelequivalents.com/hu/anyagok/uns/j93633.md it: https://steelequivalents.com/it/materiali/uns/j93633.md nl: https://steelequivalents.com/nl/materialen/uns/j93633.md pl: https://steelequivalents.com/pl/materiały/uns/j93633.md pt: https://steelequivalents.com/pt/materiais/uns/j93633.md ru: https://steelequivalents.com/ru/материалы/uns/j93633.md tr: https://steelequivalents.com/tr/malzemeler/uns/j93633.md zh: https://steelequivalents.com/zh/材料/uns/j93633.md ja: https://steelequivalents.com/ja/材料/uns/j93633.md ar: https://steelequivalents.com/ar/المواد/uns/j93633.md ko: https://steelequivalents.com/ko/재료/uns/j93633.md pt-br: https://steelequivalents.com/pt-br/materiais/uns/j93633.md hi: https://steelequivalents.com/hi/सामग्री/uns/j93633.md content_hash: sha256:1424701c216caf3faa7af69a0defd40780f96f0b08235638f5e2818c3393abf9 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/j93633 > Canonical URL: https://steelequivalents.com/materials/uns/j93633 > 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 · 20 designations # J93633 J93633 is a designation in UNS for the material held under material number 1.4837, also listed as GX40CrNiSi25-12. It is a material in the category Heat-resistant cast steels. We list 20 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, JIS, GB, GOST and ČSN. - [*Material no.* **1.4837**](/materials/material-no/1.4837 "Material no.: 1.4837") - [*Category* **Heat-resistant cast steels · 82 grades**](/categories/heat-resistant-cast-steels "Category: Heat-resistant cast steels · 82 grades") - *Designations* **20** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=8ff50464-8fca-48dc-b447-12c18d3facdb&designation=b65cec6b-fb22-4f26-8fd9-90f10f401413 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uns/j93633.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN GX40CrNiSi25-12 This grade’s own name](/materials/din-en/gx40crnisi25-12 "DIN / EN GX40CrNiSi25-12") - [UNS J93503 This grade’s own name](/materials/uns/j93503 "UNS J93503") ## About Heat-resistant cast steels Heat-resistant cast steels are cast ferrous alloys formulated for service at elevated temperatures, where resistance to softening and thermal degradation is important. They are used for furnace components, heat-treatment equipment and other high-temperature plant parts that require cast shapes and dependable mechanical performance during heating. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 20 designations · 8 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 - [1.4837 Indicative](/materials/material-no/1.4837 "DIN / EN 1.4837") - [GX40CrNiSi25-12 This grade’s own name](/materials/din-en/gx40crnisi25-12 "DIN / EN GX40CrNiSi25-12") UNS United States · 5 - [J93503 This grade’s own name](/materials/uns/j93503 "UNS J93503") - [J93513 This grade’s own name](/materials/uns/j93513 "UNS J93513") - **J93633 This grade’s own name** - [J94003 Indicative](/materials/uns/j94003 "UNS J94003") - [J94013 This grade’s own name](/materials/uns/j94013 "UNS J94013") AISI / SAE United States · 3 - [J93503 Indicative](/materials/uns/j93503 "AISI / SAE J93503") - [J94003 Indicative](/materials/uns/j94003 "AISI / SAE J94003") - [J94013 Indicative](/materials/uns/j94013 "AISI / SAE J94013") BS United Kingdom · 1 - [309C30 Indicative](/materials/bs/309c30 "BS 309C30") JIS Japan · 5 - [SCH 13 Indicative](/materials/jis/sch13 "JIS SCH 13") - [SCH 13A Indicative](/materials/jis/sch13a "JIS SCH 13A") - [SCH 13X Indicative](/materials/jis/sch13x "JIS SCH 13X") - [SCH 17 Indicative](/materials/jis/sch17 "JIS SCH 17") - [SCS 17 Indicative](/materials/jis/scs17 "JIS SCS 17") GB China · 1 - [ZG35Cr26Ni12 Indicative](/materials/gb/zg35cr26ni12 "GB ZG35Cr26Ni12") GOST Russia / CIS · 2 - [40Ch24N12SL Indicative](/materials/gost/40ch24n12sl "GOST 40Ch24N12SL") - [40KH24N12SL Indicative](/materials/gost/40kh24n12sl "GOST 40KH24N12SL") ČSN Czechia · 1 - [422 936 Indicative](/materials/csn/422936 "ČSN 422 936") 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 — 57.3 % Cr — 25.5 % Ni — 12.5 % Mn — 2 % Traces & impurities · 2.7 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.3–0.5 | | Si | 1–2.5 | | Mn | ≤ 2 | | P | 0.04 | | S | 0.03 | | Cr | 24–27 | | Mo | ≤ 0.5 | | Ni | 11–14 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel 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 | 0,30-0,50 | 0.300 | 0.500 | Range | | Si | 1,00-2,50 | 1.000 | 2.500 | Range | | P | 0,04 | 0.040 | 0.040 | Exact | | S | 0,03 | 0.030 | 0.030 | Exact | | Cr | 24,0-27,0 | 24.000 | 27.000 | Range | | Mn | ≤2,00 | — | 2.000 | Max | | Ni | 11,0-14,0 | 11.000 | 14.000 | Range | | Mo | ≤0,50 | — | 0.500 | 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 Weldability readily weldable As published: without limitations. Flake sensitivity not susceptible As published: not predisposed Temper brittleness not susceptible As published: not predisposed 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 2 conditions · 11 values By dimension**Quenching 1050°C** source `splav` | Dimension mm | Rm N/mm² | Re N/mm² | A5% | Z% | |---|---|---|---|---| | to 100 | 491 | 245 | 20 | 28 | At temperature**no delivery state stated** source `splav` | Temperature °C | Density g/cm³ | Elastic modulus GPa | Thermal expansion coefficient 10^-6/K | Electrical resistivity nΩ·m | |---|---|---|---|---| | 20 | 7.8 | 196 | — | 860 | | 100 | — | — | 18.4 | — | | 500 | — | 167 | — | — | | 600 | — | 157 | — | — | | 700 | — | 145 | — | — | 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. ## 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=8ff50464-8fca-48dc-b447-12c18d3facdb&designation=b65cec6b-fb22-4f26-8fd9-90f10f401413 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uns/j93633.pdf "Datasheet as PDF")