--- title: "A182 F12 — Heat-resistant structural steels" description: "A182 F12 in ASTM: material number 1.7337, also listed as 16CrMo4-4. Category: Heat-resistant structural steels. Designations recorded for this grade: 15." canonical: https://steelequivalents.com/materials/astm/a182-f12 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/astm/a182-f12.md cs: https://steelequivalents.com/cs/materiály/astm/a182-f12.md de: https://steelequivalents.com/de/werkstoffe/astm/a182-f12.md es: https://steelequivalents.com/es/materiales/astm/a182-f12.md fr: https://steelequivalents.com/fr/matériaux/astm/a182-f12.md hu: https://steelequivalents.com/hu/anyagok/astm/a182-f12.md it: https://steelequivalents.com/it/materiali/astm/a182-f12.md nl: https://steelequivalents.com/nl/materialen/astm/a182-f12.md pl: https://steelequivalents.com/pl/materiały/astm/a182-f12.md pt: https://steelequivalents.com/pt/materiais/astm/a182-f12.md ru: https://steelequivalents.com/ru/материалы/astm/a182-f12.md tr: https://steelequivalents.com/tr/malzemeler/astm/a182-f12.md zh: https://steelequivalents.com/zh/材料/astm/a182-f12.md ja: https://steelequivalents.com/ja/材料/astm/a182-f12.md ar: https://steelequivalents.com/ar/المواد/astm/a182-f12.md ko: https://steelequivalents.com/ko/재료/astm/a182-f12.md pt-br: https://steelequivalents.com/pt-br/materiais/astm/a182-f12.md hi: https://steelequivalents.com/hi/सामग्री/astm/a182-f12.md content_hash: sha256:c8198ac99af8a36a0931478b2eb3a8a16a979ee5000be63af4db0dc5e0012b38 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/astm/a182-f12 > Canonical URL: https://steelequivalents.com/materials/astm/a182-f12 > 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. ASTM · United States · 15 designations # A182 F12 A182 F12 is a designation in ASTM for the material held under material number 1.7337, also listed as 16CrMo4-4. It is a material in the category Heat-resistant structural steels. We list 15 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, JIS, GB, GOST and SS. - [*Material no.* **1.7337**](/materials/material-no/1.7337 "Material no.: 1.7337") - [*Category* **Heat-resistant structural steels · 62 grades**](/categories/heat-resistant-structural-steels "Category: Heat-resistant structural steels · 62 grades") - *Designations* **15** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=a7ce055b-971e-4722-b35b-30c0c8eb47d2&designation=e05d66c0-e2c3-4b36-8b93-d22e8d18403e "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/astm/a182-f12.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 16CrMo4-4 This grade’s own name](/materials/din-en/16crmo4-4 "DIN / EN 16CrMo4-4") - [UNS K11564 This grade’s own name · 2 grades on that route](/materials/uns/k11564 "UNS K11564") - [ASTM A 182 F 12 Class2 This grade’s own name](/materials/astm/a-182-f-12-class2 "ASTM A 182 F 12 Class2") ## About Heat-resistant structural steels Heat-resistant structural steels are structural steels designed to retain useful strength and dimensional stability at elevated temperatures. They are used for load-bearing components in hot-service equipment where mechanical performance must be maintained during heating. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 15 designations · 10 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 - [16CrMo4-4 This grade’s own name](/materials/din-en/16crmo4-4 "DIN / EN 16CrMo4-4") UNS United States · 1 - [K11564 This grade’s own name](/materials/uns/k11564 "UNS K11564") AISI / SAE United States · 1 - [A387(12) Indicative](/materials/aisi-sae/a387-12 "AISI / SAE A387(12)") ASTM United States · 4 - [A 182 F 12 Class2 This grade’s own name](/materials/astm/a-182-f-12-class2 "ASTM A 182 F 12 Class2") - [A-387Cr . B Indicative](/materials/astm/a-387cr-b "ASTM A-387Cr . B") - **A182 F12 Indicative** - [A387(12) Indicative](/materials/aisi-sae/a387-12 "ASTM A387(12)") BS United Kingdom · 2 - [1653 Indicative](/materials/bs/1653 "BS 1653") - [620Gr.27 Indicative](/materials/bs/620gr-27 "BS 620Gr.27") AFNOR France · 2 - [12CD4 Indicative](/materials/afnor/12cd4 "AFNOR 12CD4") - [15CD4.5 Indicative](/materials/afnor/15cd4-5 "AFNOR 15CD4.5") JIS Japan · 1 - [STC42 Indicative](/materials/jis/stc42 "JIS STC42") GB China · 1 - [15CrMo Indicative](/materials/gb/15crmo "GB 15CrMo") GOST Russia / CIS · 1 - [15XM Indicative](/materials/gost/15xm "GOST 15XM") SS Sweden · 1 - [2216 Indicative](/materials/gost/2216 "SS 2216") 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 Mn Mo Iron — the balance, never listed by a standard — 97 % Cr — 1.1 % Mn — 0.7 % Mo — 0.5 % Traces & impurities · 0.9 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.13–0.2 | | Si | 0.15–0.35 | | Mn | 0.5–0.8 | | P | 0.035 | | S | 0.035 | | Cr | 0.9–1.2 | | Mo | 0.4–0.5 | | Ni | 0.4 | 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 | 0,13-0,20 | 0.130 | 0.200 | Range | | Si | 0,15-0,35 | 0.150 | 0.350 | Range | | P | 0,035 | 0.035 | 0.035 | Exact | | S | 0,035 | 0.035 | 0.035 | Exact | | Cr | 0,90-1,20 | 0.900 | 1.200 | Range | | Mn | 0,50-0,80 | 0.500 | 0.800 | Range | | Ni | 0,4 | 0.400 | 0.400 | Exact | | Mo | 0,40-0,50 | 0.400 | 0.500 | 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 computed from composition · °C Predicted Ae3 814 °C Predicted Ae1 742 °C Predicted Acm 465 °C Predicted Bs 530 °C These four temperatures are a CALCULATION from this grade's own composition, using the published Li, Niebuhr, Meekisho & Atteridge (1998) model — never a measurement, and computed from the UPPER BOUND of each element's specified range, not a mid-range figure. Where this grade also has a measured transformation point (Ac1, Ac3, Ar1, Ar3) on file, it is shown separately, in Physical & mechanical properties, and is never replaced by the predicted figures here — Ae (predicted, equilibrium) and Ac/Ar (measured, on heating or cooling) are different physical quantities and can differ by tens of degrees; a mismatch between the two is not an error in either. ## 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. ## Similar grades — and why Selection rule, stated so you can disagree with it: same number class 1.7, a shared category, and a published range for Cr / Mn 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. [16CrMo4 1.7242 Cr 0,90-1,20 · Mn 0,50-0,80 - ΔCr 0.00 - ΔMn 0.00 - 1 designations](/materials/din-en/16crmo4 "16CrMo4")[24CrMo5 1.7258 Cr 0,90-1,20 · Mn 0,50-0,80 - ΔCr 0.00 - ΔMn 0.00 - 1 designations](/materials/din-en/24crmo5 "24CrMo5")[22CrMo4-4 1.7350 Cr 0,90-1,20 · Mn 0,50-0,80 - ΔCr 0.00 - ΔMn 0.00 - 3 designations](/materials/din-en/22crmo4-4 "22CrMo4-4")[40CrMoV4-6 1.7711 Cr 0,90-1,20 · Mn 0,45-0,85 - ΔCr 0.00 - ΔMn 0.00 - 8 designations](/materials/din-en/40crmov4-6 "40CrMoV4-6")[1.7335 1.7335 Cr 0,70-1,15 · Mn 0,40-1,00 - ΔCr 0.13 - ΔMn 0.05 - 101 designations](/materials/material-no/1.7335 "1.7335")[13CrMoSi5-5 1.7336 Cr 1,00-1,50 · Mn 0,40-0,65 - ΔCr 0.20 - ΔMn 0.13 - 12 designations](/materials/din-en/13crmosi5-5 "13CrMoSi5-5") ## 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=a7ce055b-971e-4722-b35b-30c0c8eb47d2&designation=e05d66c0-e2c3-4b36-8b93-d22e8d18403e "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/astm/a182-f12.pdf "Datasheet as PDF")