--- title: "Ao20Mn5 — Quenched and tempered steels" description: "Ao20Mn5 in MSZ: material number 1.1133, also listed as 20Mn5. Category: Quenched and tempered steels. Designations recorded for this grade: 71." canonical: https://steelequivalents.com/materials/msz/ao20mn5 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/msz/ao20mn5.md cs: https://steelequivalents.com/cs/materiály/msz/ao20mn5.md de: https://steelequivalents.com/de/werkstoffe/msz/ao20mn5.md es: https://steelequivalents.com/es/materiales/msz/ao20mn5.md fr: https://steelequivalents.com/fr/matériaux/msz/ao20mn5.md hu: https://steelequivalents.com/hu/anyagok/msz/ao20mn5.md it: https://steelequivalents.com/it/materiali/msz/ao20mn5.md nl: https://steelequivalents.com/nl/materialen/msz/ao20mn5.md pl: https://steelequivalents.com/pl/materiały/msz/ao20mn5.md pt: https://steelequivalents.com/pt/materiais/msz/ao20mn5.md ru: https://steelequivalents.com/ru/материалы/msz/ao20mn5.md tr: https://steelequivalents.com/tr/malzemeler/msz/ao20mn5.md zh: https://steelequivalents.com/zh/材料/msz/ao20mn5.md ja: https://steelequivalents.com/ja/材料/msz/ao20mn5.md ar: https://steelequivalents.com/ar/المواد/msz/ao20mn5.md ko: https://steelequivalents.com/ko/재료/msz/ao20mn5.md pt-br: https://steelequivalents.com/pt-br/materiais/msz/ao20mn5.md hi: https://steelequivalents.com/hi/सामग्री/msz/ao20mn5.md content_hash: sha256:d091aaa37ab9320dbba62858a1e139362de8fa775e514aec0116feb230b6aea9 generated: 2026-09-21 --- > **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/msz/ao20mn5 > Canonical URL: https://steelequivalents.com/materials/msz/ao20mn5 > 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. MSZ · Hungary · 71 designations # Ao20Mn5 Ao20Mn5 is a designation in MSZ for the material held under material number 1.1133, also listed as 20Mn5. It is a material in the category Quenched and tempered steels. We list 71 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, UNE, ISO, JIS, GB, GOST, UNI, SS, ČSN, STN, PN, MSZ, AS / NZS, BDS, SNV and KS. - [*Material no.* **1.1133**](/materials/material-no/1.1133 "Material no.: 1.1133") - [*Category* **Quenched and tempered steels · 133 grades**](/categories/quenched-and-tempered-steels "Category: Quenched and tempered steels · 133 grades") - *Designations* **71** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=df7e3610-a6fc-4160-8996-c8d6595b261b&designation=ba12f480-e964-4df8-b792-06cbf7115735 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/msz/ao20mn5.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 20Mn5 This grade’s own name](/materials/din-en/20mn5 "DIN / EN 20Mn5") - [UNS G15180 This grade’s own name](/materials/uns/g15180 "UNS G15180") - [AISI / SAE 1518 This grade’s own name · 2 grades on that route](/materials/aisi-sae/1518 "AISI / SAE 1518") - [GB 20G This grade’s own name · 2 grades on that route](/materials/gb/20g "GB 20G") ## About Quenched and tempered steels Quenched and tempered steels are heat-treated steels designed to combine high strength with useful toughness and ductility. They are used for heavily loaded components such as shafts, gears, fasteners and structural machine parts where resistance to mechanical stress is required. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 71 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 · 1 - [20Mn5 This grade’s own name](/materials/din-en/20mn5 "DIN / EN 20Mn5") UNS United States · 3 - [G15180 This grade’s own name](/materials/uns/g15180 "UNS G15180") - [G15220 This grade’s own name](/materials/uns/g15220 "UNS G15220") - [H15220 This grade’s own name](/materials/uns/h15220 "UNS H15220") AISI / SAE United States · 12 - [1021 Indicative](/materials/aisi-sae/1021 "AISI / SAE 1021") - [1022 Indicative](/materials/aisi-sae/1022 "AISI / SAE 1022") - [1518 This grade’s own name](/materials/aisi-sae/1518 "AISI / SAE 1518") - [1522 This grade’s own name](/materials/aisi-sae/1522 "AISI / SAE 1522") - [1522H This grade’s own name](/materials/aisi-sae/1522h "AISI / SAE 1522H") - [G10210 Indicative](/materials/aisi-sae/g10210 "AISI / SAE G10210") - [G10220 Indicative](/materials/uns/g10220 "AISI / SAE G10220") - [G15180 Indicative](/materials/uns/g15180 "AISI / SAE G15180") - [G15220 Indicative](/materials/uns/g15220 "AISI / SAE G15220") - [H15211 Indicative](/materials/uns/h15211 "AISI / SAE H15211") - [H15220 Indicative](/materials/uns/h15220 "AISI / SAE H15220") - [K02700 Indicative](/materials/uns/k02700 "AISI / SAE K02700") ASTM United States · 4 - [1022 1518 Indicative](/materials/astm/1022-1518 "ASTM 1022 1518") - [201 Indicative](/materials/aisi-sae/201 "ASTM 201") - [321 Indicative](/materials/aisi-sae/321 "ASTM 321") - [A502 Indicative](/materials/astm/a502 "ASTM A502") BS United Kingdom · 5 - [080A20 Indicative](/materials/bs/080a20 "BS 080A20") - [120M19 Indicative](/materials/bs/120m19 "BS 120M19") - [150M19 Indicative](/materials/bs/150m19 "BS 150M19") - [20Mn5 Indicative](/materials/din-en/20mn5 "BS 20Mn5") - [90440 Indicative](/materials/bs/90440 "BS 90440") AFNOR France · 2 - [20M5 Indicative](/materials/afnor/20m5 "AFNOR 20M5") - [TU48C Indicative](/materials/afnor/tu48c "AFNOR TU48C") UNE Spain · 4 - [20Mn6 Indicative](/materials/din-en/20mn6 "UNE 20Mn6") - [F.1515 Indicative](/materials/une/f-1515 "UNE F.1515") - [F.1515-20Mn6 Indicative](/materials/une/f-1515-20mn6 "UNE F.1515-20Mn6") - [F.220A Indicative](/materials/une/f-220a "UNE F.220A") ISO International · 2 - [22Mn6 Indicative](/materials/din-en/22mn6 "ISO 22Mn6") - [22Mn6H Indicative](/materials/iso/22mn6h "ISO 22Mn6H") JIS Japan · 4 - [S Mn C 420 Indicative](/materials/jis/smnc420 "JIS S Mn C 420") - [SMn420 Indicative](/materials/ks/smn420 "JIS SMn420") - [SMn420H Indicative](/materials/ks/smn420h "JIS SMn420H") - [STB510 Indicative](/materials/jis/stb510 "JIS STB510") GB China · 4 - [10Mn2 Indicative](/materials/gb/10mn2 "GB 10Mn2") - [20G This grade’s own name](/materials/gb/20g "GB 20G") - [20Mn2 Indicative](/materials/gb/20mn2 "GB 20Mn2") - [20MnG Indicative](/materials/gb/20mng "GB 20MnG") GOST Russia / CIS · 15 - [20G Indicative](/materials/gb/20g "GOST 20G") - [20GS2 Indicative](/materials/gost/20gs2 "GOST 20GS2") - [20GSL Indicative](/materials/gost/20gsl "GOST 20GSL") - [20KHG2T Indicative](/materials/gost/20khg2t "GOST 20KHG2T") - [20KHG2TS Indicative](/materials/gost/20khg2ts "GOST 20KHG2TS") - [20KHGS2 Indicative](/materials/gost/20khgs2 "GOST 20KHGS2") - [20N2M Indicative](/materials/gost/20n2m "GOST 20N2M") - [20Г Indicative](/materials/gb/20g "GOST 20Г") - [20Г2 Indicative](/materials/gost/20g2 "GOST 20Г2") - [20НМ Indicative](/materials/gost/20nm "GOST 20НМ") - [22K Indicative](/materials/gost/22k "GOST 22K") - [22KhNM Indicative](/materials/gost/22khnm "GOST 22KhNM") - [22К Indicative](/materials/gost/22k "GOST 22К") - [CHN20D2SH Indicative](/materials/gost/chn20d2sh "GOST CHN20D2SH") - [ст.22K Indicative](/materials/gost/st-22k "GOST ст.22K") UNI Italy · 2 - [20Mn7 Indicative](/materials/uni/20mn7 "UNI 20Mn7") - [G22Mn3 Indicative](/materials/uni/g22mn3 "UNI G22Mn3") SS Sweden · 1 - [2132 Indicative](/materials/ss/2132 "SS 2132") ČSN Czechia · 4 - [12022 Indicative](/materials/csn/12022 "ČSN 12022") - [13030 Indicative](/materials/csn/13030 "ČSN 13030") - [13123 Indicative](/materials/csn/13123 "ČSN 13123") - [422 714 Indicative](/materials/csn/422714 "ČSN 422 714") STN Slovakia · 1 - [13 030 Indicative](/materials/csn/13030 "STN 13 030") PN Poland · 2 - [20G Indicative](/materials/gb/20g "PN 20G") - [25 Indicative](/materials/gost/25 "PN 25") MSZ Hungary · 1 - **Ao20Mn5 Indicative** AS / NZS Australia / New Zealand · 1 - [1022 Indicative](/materials/aisi-sae/1022 "AS / NZS 1022") BDS Bulgaria · 1 - [20G Indicative](/materials/gb/20g "BDS 20G") SNV Switzerland · 1 - [20Mn5 Indicative](/materials/din-en/20mn5 "SNV 20Mn5") KS South Korea · 1 - [SMnC420 Indicative](/materials/jis/smnc420 "KS SMnC420") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 9 elements on file · weight % What this alloy is Fe Mn Si Cr Iron — the balance, never listed by a standard — 97.2 % Mn — 1.3 % Si — 0.4 % Cr — 0.4 % Traces & impurities · 0.8 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.17–0.23 | | Si | ≤ 0.4 | | Mn | 1–1.5 | | P | 0.035 | | S | 0.035 | | Cr | ≤ 0.4 | | Mo | ≤ 0.1 | | Ni | ≤ 0.4 | | Al | ≥ 0.02 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel 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 | 0,17-0,23 | 0.170 | 0.230 | Range | | Al | ≥0,020 | 0.020 | — | Min | | Si | ≤0,40 | — | 0.400 | Max | | P | 0,035 | 0.035 | 0.035 | Exact | | S | 0,035 | 0.035 | 0.035 | Exact | | Cr | ≤0,40 | — | 0.400 | Max | | Mn | 1,00-1,50 | 1.000 | 1.500 | Range | | Ni | ≤0,40 | — | 0.400 | Max | | Mo | ≤0,10 | — | 0.100 | Max | - (Cr+Mo+Ni)≤0,63 - (Cr+Mo+Ni)≤0,63 - (Cr+Mo+Ni)≤0,63 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 802 °C Predicted Ae1 714 °C Predicted Acm 464 °C Predicted Bs 547 °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 Transformation point Ac1 724 °C Exact Transformation point Ac3 845 °C Exact · Ac3(Acm) Transformation point Ar3 815 °C Exact · Ar3(Arcm) Transformation point Ar1 682 °C Exact Weldability weldable with restrictions As published: limited weldability. 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 6 conditions · 87 values By thickness**Normalized** source `steelnumber` | Thickness mm | Rm N/mm² | |---|---| | ≤ 100 | 530 | | 100 – 250 | 520 | | 250 – 500 | 500 | | 500 – 750 | 490 | By dimension**no delivery state stated** source `caishuku` | Specimen size mm | Rm N/mm² | Re N/mm² | A% | HB | |---|---|---|---|---| | 15 – 15 | ≥ 785 | ≥ 590 | ≥ 10 | ≤ 187 | By dimension**Normalizing 940 - 960°C,Drawing 630 - 650°C,Cooling air, 65°C/h** source `splav` | Dimension mm | Rm N/mm² | KCU kJ/m² | |---|---|---| | 60 - 90 | 440 | 600 | By delivery state**no delivery state stated** source `splav` | Delivery state | Rm N/mm² | Re N/mm² | A5% | KCU kJ/m² | |---|---|---|---|---| | Sheet, GOST 5520-79 | 430 – 590 | 255 – 265 | 22 | 590 | At temperature**no delivery state stated** source `splav` | Temperature °C | Density g/cm³ | Elastic modulus GPa | Thermal expansion coefficient 10^-6/K | Thermal conductivity W/(m·K) | Specific heat capacity J/(kg·K) | Electrical resistivity nΩ·m | |---|---|---|---|---|---|---| | 20 | 7.859 | 211 | — | 51.7 | — | 173 | | 100 | 7.834 | 208 | 11.75 | 51 | 470 | 219 | | 200 | 7.803 | 205 | 12.2 | 48.5 | 483 | 292 | | 300 | 7.77 | 200 | 12.8 | 44.4 | — | 381 | | 400 | 7.736 | 191 | 13.2 | 42.7 | 525 | 487 | | 500 | 7.699 | 180 | 13.5 | 39.3 | 571 | 601 | | 600 | 7.659 | 165 | 13.85 | 35.6 | — | 758 | | 700 | 7.617 | — | 14.6 | 31.9 | — | 925 | | 800 | 7.624 | — | 12.7 | 25.9 | — | 1094 | | 900 | 7.6 | — | 12.4 | 26.4 | — | 1135 | | 1000 | 7.548 | — | 13.4 | 27.7 | — | 1167 | | 1100 | 7.496 | — | 14.2 | 28.5 | — | 1194 | | 1200 | — | — | 14.8 | 29.8 | — | 1219 | At temperature**no delivery state stated** source `caishuku` | Temperature °C | Elastic modulus GPa | Thermal expansion coefficient 10^-6/K | Thermal conductivity W/(m·K) | Specific heat capacity J/(kg·K) | |---|---|---|---|---| | 20 | 210 | — | — | — | | 100 | — | — | 40.06 | — | | 200 | — | 12.1 | — | — | | 300 | 185 | — | 42.29 | — | | 400 | 175 | 13.5 | — | — | | 500 | — | — | 37.26 | — | | 600 | — | 14.1 | — | — | | 700 | — | — | 30.98 | — | | 900 | — | — | — | 586 | | 1100 | — | — | — | 620 | 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. ## Heat treatment **GB /T 5310-2023** Single operation - Normalizing 880–940 °C Supply condition - Quenching and Tempering Test specimen size t=15 - Quenching - Carburizing - Normalizing Conditions the standard permits on delivery. No temperature or medium is published for these, so no order and no alternation is implied. Source: [www.caishuku.com](https://www.caishuku.com/detail/azhlNWIxMzM1Mzk_ "Source: www.caishuku.com") ## Similar grades — and why Selection rule, stated so you can disagree with it: same number class 1.1, a shared category, and a published range for Mn / 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. [26Mn5 1.1161 Mn 1,20-1,50 · Si ≤0,40 - ΔMn 0.10 - ΔSi 0.00 - 7 designations](/materials/din-en/26mn5 "26Mn5")[1.1167 1.1167 Mn 1,20-1,50 · Si ≤0,40 - ΔMn 0.10 - ΔSi 0.00 - 82 designations](/materials/material-no/1.1167 "1.1167")[30Mn5 1.1173 Mn 1,20-1,50 · Si 0,15-0,40 - ΔMn 0.10 - ΔSi 0.08 - 10 designations](/materials/din-en/30mn5 "30Mn5")[56Mn4 1.1233 Mn 0,90-1,20 · Si ≤0,40 - ΔMn 0.20 - ΔSi 0.00 - 13 designations](/materials/din-en/56mn4 "56Mn4")[1.1170 1.1170 Mn 1,30-1,65 · Si ≤0,40 - ΔMn 0.23 - ΔSi 0.00 - 44 designations](/materials/material-no/1.1170 "1.1170")[38Mn6 1.1127 Mn 1,40-1,65 · Si 0,15-0,35 - ΔMn 0.27 - ΔSi 0.05 - 10 designations](/materials/din-en/38mn6 "38Mn6") ## 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=df7e3610-a6fc-4160-8996-c8d6595b261b&designation=ba12f480-e964-4df8-b792-06cbf7115735 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/msz/ao20mn5.pdf "Datasheet as PDF")