--- title: "442 — Heat resistant steels" description: "442 in AISI / SAE: material number 1.4742, also listed as X10CrAl18. Category: Heat resistant steels. Designations recorded for this grade: 38." canonical: https://steelequivalents.com/materials/aisi-sae/442 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/aisi-sae/442.md cs: https://steelequivalents.com/cs/materiály/aisi-sae/442.md de: https://steelequivalents.com/de/werkstoffe/aisi-sae/442.md es: https://steelequivalents.com/es/materiales/aisi-sae/442.md fr: https://steelequivalents.com/fr/matériaux/aisi-sae/442.md hu: https://steelequivalents.com/hu/anyagok/aisi-sae/442.md it: https://steelequivalents.com/it/materiali/aisi-sae/442.md nl: https://steelequivalents.com/nl/materialen/aisi-sae/442.md pl: https://steelequivalents.com/pl/materiały/aisi-sae/442.md pt: https://steelequivalents.com/pt/materiais/aisi-sae/442.md ru: https://steelequivalents.com/ru/материалы/aisi-sae/442.md tr: https://steelequivalents.com/tr/malzemeler/aisi-sae/442.md zh: https://steelequivalents.com/zh/材料/aisi-sae/442.md ja: https://steelequivalents.com/ja/材料/aisi-sae/442.md ar: https://steelequivalents.com/ar/المواد/aisi-sae/442.md ko: https://steelequivalents.com/ko/재료/aisi-sae/442.md pt-br: https://steelequivalents.com/pt-br/materiais/aisi-sae/442.md hi: https://steelequivalents.com/hi/सामग्री/aisi-sae/442.md content_hash: sha256:960c6960a0bacb7ca5eb4c3a6282a6836126f0c9d8faf9b6c58ce69fa9720b48 generated: 2026-09-24 --- > **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/aisi-sae/442 > Canonical URL: https://steelequivalents.com/materials/aisi-sae/442 > 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. AISI / SAE · United States · 38 designations # 442 442 is a designation in AISI / SAE for the material held under material number 1.4742, also listed as X10CrAl18. It is a material in the category Heat resistant steels. We list 38 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, UNE, JIS, GB, GOST, UNI, SS, SRPS, PN, MSZ, STAS, BDS and KS. - [*Material no.* **1.4742**](/materials/material-no/1.4742 "Material no.: 1.4742") - [*Category* **Heat resistant steels · 64 grades**](/categories/heat-resistant-steels "Category: Heat resistant steels · 64 grades") - *Designations* **38** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=55687e69-0c95-4a4a-b927-e1401f0144f5&designation=3a864892-0769-4d52-a8d4-9cbbcb7a3815 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/aisi-sae/442.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN X10CrAlSi18 This grade’s own name](/materials/din-en/x10cralsi18 "DIN / EN X10CrAlSi18") - [JIS SUH21 This grade’s own name · 2 grades on that route](/materials/jis/suh21 "JIS SUH21") - [SS SISI 442 This grade’s own name](/materials/ss/sisi-442 "SS SISI 442") ## 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 38 designations · 18 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 · 4 - [1.4742 Indicative](/materials/material-no/1.4742 "DIN / EN 1.4742") - [X10CrA118 Indicative](/materials/din-en/x10cra118 "DIN / EN X10CrA118") - [X10CrAl18 This grade’s own name Withdrawn](/materials/din-en/x10cral18 "DIN / EN X10CrAl18") - [X10CrAlSi18 This grade’s own name](/materials/din-en/x10cralsi18 "DIN / EN X10CrAlSi18") UNS United States · 1 - [S44200 Indicative](/materials/uns/s44200 "UNS S44200") AISI / SAE United States · 3 - [430 Indicative](/materials/aisi-sae/430 "AISI / SAE 430") - **442 Indicative** - [51442 Indicative](/materials/aisi-sae/51442 "AISI / SAE 51442") ASTM United States · 1 - [A176 Indicative](/materials/astm/a176 "ASTM A176") BS United Kingdom · 3 - [430S15 Indicative](/materials/bs/430s15 "BS 430S15") - [EN60 Indicative](/materials/bs/en60 "BS EN60") - [X10CrAlSi18 Indicative](/materials/din-en/x10cralsi18 "BS X10CrAlSi18") AFNOR France · 2 - [Z10CAS18 Indicative](/materials/afnor/z10cas18 "AFNOR Z10CAS18") - [Z12CAS18 Indicative](/materials/afnor/z12cas18 "AFNOR Z12CAS18") UNE Spain · 5 - [F.3113 Indicative](/materials/une/f-3113 "UNE F.3113") - [F.3153 Indicative](/materials/une/f-3153 "UNE F.3153") - [F.3153-X10CrAI 18 Indicative](/materials/une/f-3153-x10crai-18 "UNE F.3153-X10CrAI 18") - [X10CrAl18 Indicative](/materials/din-en/x10cral18 "UNE X10CrAl18") - [X10CrAlSi18 Indicative](/materials/din-en/x10cralsi18 "UNE X10CrAlSi18") JIS Japan · 3 - [SUH21 This grade’s own name](/materials/jis/suh21 "JIS SUH21") - [SUN21 Indicative](/materials/jis/sun21 "JIS SUN21") - [SUS430 Indicative](/materials/jis/sus430 "JIS SUS430") GB China · 2 - [1Cr19Al3 Indicative](/materials/gb/1cr19al3 "GB 1Cr19Al3") - [Cr17 Indicative](/materials/gb/cr17 "GB Cr17") GOST Russia / CIS · 6 - [15Ch18Ju Indicative](/materials/gost/15ch18ju "GOST 15Ch18Ju") - [15Ch18SJu Indicative](/materials/gost/15ch18sju "GOST 15Ch18SJu") - [15KH18SYU Indicative](/materials/gost/15kh18syu "GOST 15KH18SYU") - [15Х18СЮ Indicative](/materials/gost/15kh18syu "GOST 15Х18СЮ") - [Х18СЮ Indicative](/materials/gost/kh18syu "GOST Х18СЮ") - [ЭИ484 Indicative](/materials/gost/ei484 "GOST ЭИ484") UNI Italy · 1 - [X8Cr17 Indicative](/materials/uni/x8cr17 "UNI X8Cr17") SS Sweden · 1 - [SISI 442 This grade’s own name](/materials/ss/sisi-442 "SS SISI 442") SRPS Serbia · 1 - [Č.4973 Indicative](/materials/srps/c-4973 "SRPS Č.4973") PN Poland · 1 - [H18JS Indicative](/materials/pn/h18js "PN H18JS") MSZ Hungary · 1 - [H13 Indicative](/materials/aisi-sae/h13 "MSZ H13") STAS Romania · 1 - [10AlCr180 Indicative](/materials/stas/10alcr180 "STAS 10AlCr180") BDS Bulgaria · 1 - [Ch18SJu Indicative](/materials/bds/ch18sju "BDS Ch18SJu") KS South Korea · 1 - [STR21 Indicative](/materials/ks/str21 "KS STR21") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 7 elements on file · weight % What this alloy is Fe Cr Si Mn Iron — the balance, never listed by a standard — 78.8 % Cr — 18 % Si — 1 % Mn — 1 % Traces & impurities · 1.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.12 | | Si | 0.7–1.4 | | Mn | ≤ 1 | | P | 0.04 | | S | 0.015 | | Cr | 17–19 | | Al | 0.7–1.2 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Aluminium 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 | ≤0,12 | — | 0.120 | Max | | Al | 0,70-1,20 | 0.700 | 1.200 | Range | | Si | 0,70-1,40 | 0.700 | 1.400 | Range | | P | 0,04 | 0.040 | 0.040 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Cr | 17,0-19,0 | 17.000 | 19.000 | Range | | Mn | ≤1,00 | — | 1.000 | 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 Not enough recorded composition to predict a transformation temperature for this grade — missing: Ni, Mo. ## Physical & mechanical properties Density 7,56 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 3 conditions · 8 values By delivery state**Soft annealed** source `steelnumber` | Delivery state | HB | |---|---| | Soft annealed | 212 | 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 | 295 | 20 | 50 | By delivery state**no delivery state stated** source `steeljis` | Delivery state | Rm N/mm² | Re N/mm² | A% | |---|---|---|---| | Plate/Sheet | 440 | 245 | 15 | 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 / Si 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. [1.4878 1.4878 Cr 17,0-19,0 · Si ≤1,00 - ΔCr 0.00 - ΔSi 0.55 - 63 designations](/materials/material-no/1.4878 "1.4878")[X2CrAlTi18-2 1.4605 Cr 17,0-18,0 · Si ≤1,00 - ΔCr 0.50 - ΔSi 0.55 - 12 designations](/materials/din-en/x2cralti18-2 "X2CrAlTi18-2")[1.4864 1.4864 Cr 15,0-17,0 · Si 1,00-2,00 - ΔCr 2.00 - ΔSi 0.45 - 26 designations](/materials/material-no/1.4864 "1.4864")[X10NiCr32-20 1.4861 Cr 19,0-22,0 · Si ≤1,00 - ΔCr 2.50 - ΔSi 0.55 - 1 designations](/materials/din-en/x10nicr32-20 "X10NiCr32-20")[X10NiCrAlTi32-21 1.4876 Cr 19,0-23,0 · Si ≤1,00 - ΔCr 3.00 - ΔSi 0.55 - 46 designations](/materials/din-en/x10nicralti32-21 "X10NiCrAlTi32-21") ## 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=55687e69-0c95-4a4a-b927-e1401f0144f5&designation=3a864892-0769-4d52-a8d4-9cbbcb7a3815 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/aisi-sae/442.pdf "Datasheet as PDF")