--- title: "J91153 — Heat-resistant cast steels" description: "J91153 in UNS: material number 1.4729, also listed as GX40CrSi13. Category: Heat-resistant cast steels. Designations recorded for this grade: 6." canonical: https://steelequivalents.com/materials/uns/j91153 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/uns/j91153.md cs: https://steelequivalents.com/cs/materiály/uns/j91153.md de: https://steelequivalents.com/de/werkstoffe/uns/j91153.md es: https://steelequivalents.com/es/materiales/uns/j91153.md fr: https://steelequivalents.com/fr/matériaux/uns/j91153.md hu: https://steelequivalents.com/hu/anyagok/uns/j91153.md it: https://steelequivalents.com/it/materiali/uns/j91153.md nl: https://steelequivalents.com/nl/materialen/uns/j91153.md pl: https://steelequivalents.com/pl/materiały/uns/j91153.md pt: https://steelequivalents.com/pt/materiais/uns/j91153.md ru: https://steelequivalents.com/ru/материалы/uns/j91153.md tr: https://steelequivalents.com/tr/malzemeler/uns/j91153.md zh: https://steelequivalents.com/zh/材料/uns/j91153.md ja: https://steelequivalents.com/ja/材料/uns/j91153.md ar: https://steelequivalents.com/ar/المواد/uns/j91153.md ko: https://steelequivalents.com/ko/재료/uns/j91153.md pt-br: https://steelequivalents.com/pt-br/materiais/uns/j91153.md hi: https://steelequivalents.com/hi/सामग्री/uns/j91153.md content_hash: sha256:6b27eb8bd58015c942d7fc3131e4bfce4882026bcd6e01c7646881dce27e9570 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/j91153 > Canonical URL: https://steelequivalents.com/materials/uns/j91153 > 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 · 6 designations # J91153 J91153 is a designation in UNS for the material held under material number 1.4729, also listed as GX40CrSi13. It is a material in the category Heat-resistant cast steels. We list 6 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE and JIS. - [*Material no.* **1.4729**](/materials/material-no/1.4729 "Material no.: 1.4729") - [*Category* **Heat-resistant cast steels · 82 grades**](/categories/heat-resistant-cast-steels "Category: Heat-resistant cast steels · 82 grades") - *Designations* **6** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=68566724-c6d3-47df-bb95-73d2996263a8&designation=426744c7-14ca-4013-9228-08f89ba965df "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uns/j91153.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN GX40CrSi13 This grade’s own name](/materials/din-en/gx40crsi13 "DIN / EN GX40CrSi13") ## 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 6 designations · 4 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 - [GX40CrSi13 This grade’s own name](/materials/din-en/gx40crsi13 "DIN / EN GX40CrSi13") UNS United States · 1 - **J91153 This grade’s own name** AISI / SAE United States · 1 - **J91153 Indicative** JIS Japan · 3 - [SCH 1 Indicative](/materials/jis/sch1 "JIS SCH 1") - [SCH 1X Indicative](/materials/jis/sch1x "JIS SCH 1X") - [SCH 3 Indicative](/materials/jis/sch3 "JIS SCH 3") 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 Si Mn Iron — the balance, never listed by a standard — 82.3 % Cr — 13 % Si — 1.8 % Mn — 1 % Traces & impurities · 2 % 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 | ≤ 1 | | P | 0.04 | | S | 0.03 | | Cr | 12–14 | | Mo | ≤ 0.5 | | Ni | 1 | 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 | 12,0-14,0 | 12.000 | 14.000 | Range | | Mn | ≤1,00 | — | 1.000 | Max | | Ni | 1 | 1.000 | 1.000 | Exact | | 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 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**Soft annealed** source `steelnumber` | Delivery state | HB | |---|---| | Soft annealed | 300 | 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=68566724-c6d3-47df-bb95-73d2996263a8&designation=426744c7-14ca-4013-9228-08f89ba965df "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uns/j91153.pdf "Datasheet as PDF")