--- title: "AF42C20 — Quenched and tempered steels" description: "AF42C20 in AFNOR: material number 1.0402, also listed as C22. Category: Quenched and tempered steels. Designations recorded for this grade: 94." canonical: https://steelequivalents.com/materials/afnor/af42c20 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/afnor/af42c20.md cs: https://steelequivalents.com/cs/materiály/afnor/af42c20.md de: https://steelequivalents.com/de/werkstoffe/afnor/af42c20.md es: https://steelequivalents.com/es/materiales/afnor/af42c20.md fr: https://steelequivalents.com/fr/matériaux/afnor/af42c20.md hu: https://steelequivalents.com/hu/anyagok/afnor/af42c20.md it: https://steelequivalents.com/it/materiali/afnor/af42c20.md nl: https://steelequivalents.com/nl/materialen/afnor/af42c20.md pl: https://steelequivalents.com/pl/materiały/afnor/af42c20.md pt: https://steelequivalents.com/pt/materiais/afnor/af42c20.md ru: https://steelequivalents.com/ru/материалы/afnor/af42c20.md tr: https://steelequivalents.com/tr/malzemeler/afnor/af42c20.md zh: https://steelequivalents.com/zh/材料/afnor/af42c20.md ja: https://steelequivalents.com/ja/材料/afnor/af42c20.md ar: https://steelequivalents.com/ar/المواد/afnor/af42c20.md ko: https://steelequivalents.com/ko/재료/afnor/af42c20.md pt-br: https://steelequivalents.com/pt-br/materiais/afnor/af42c20.md hi: https://steelequivalents.com/hi/सामग्री/afnor/af42c20.md content_hash: sha256:458afc78aa553cb9d9c747ab954703d04010a8722289524030b547cca3d1cbb7 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/afnor/af42c20 > Canonical URL: https://steelequivalents.com/materials/afnor/af42c20 > 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. AFNOR · France · 94 designations # AF42C20 AF42C20 is a designation in AFNOR for the material held under material number 1.0402, also listed as C22. It is a material in the category Quenched and tempered steels. We list 94 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, ISO, JIS, GB, GOST, UNI, SS, ČSN, COPANT, STN, PN, SRPS, HRN, MSZ, AS / NZS, STAS, BDS, NBN, SNV and KS. - [*Material no.* **1.0402**](/materials/material-no/1.0402 "Material no.: 1.0402") - [*Category* **Quenched and tempered steels · 133 grades**](/categories/quenched-and-tempered-steels "Category: Quenched and tempered steels · 133 grades") - *Designations* **94** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=0f3225d9-3b20-4ed1-8c9b-bbea365ba867&designation=cdab2ea9-63ec-4e5d-90da-c55af4b50452 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/afnor/af42c20.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN C22 This grade’s own name](/materials/is/c22 "DIN / EN C22") - [UNS G10200 This grade’s own name · 8 grades on that route](/materials/uns/g10200 "UNS G10200") - [AISI / SAE 1020 This grade’s own name · 11 grades on that route](/materials/aisi-sae/1020 "AISI / SAE 1020") ## 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 94 designations · 25 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 - [1.0402 Indicative](/materials/material-no/1.0402 "DIN / EN 1.0402") - [C22 This grade’s own name](/materials/is/c22 "DIN / EN C22") UNS United States · 3 - [G10200 This grade’s own name](/materials/uns/g10200 "UNS G10200") - [G10220 This grade’s own name](/materials/uns/g10220 "UNS G10220") - [G10230 This grade’s own name](/materials/uns/g10230 "UNS G10230") AISI / SAE United States · 10 - [1020 This grade’s own name](/materials/aisi-sae/1020 "AISI / SAE 1020") - [1022 This grade’s own name](/materials/aisi-sae/1022 "AISI / SAE 1022") - [1023 This grade’s own name](/materials/aisi-sae/1023 "AISI / SAE 1023") - [1024 Indicative](/materials/aisi-sae/1024 "AISI / SAE 1024") - [G10200 Indicative](/materials/uns/g10200 "AISI / SAE G10200") - [G10230 Indicative](/materials/uns/g10230 "AISI / SAE G10230") - [H10200 Indicative](/materials/aisi-sae/h10200 "AISI / SAE H10200") - [M1020 Indicative](/materials/aisi-sae/m1020 "AISI / SAE M1020") - [M1023 Indicative](/materials/aisi-sae/m1023 "AISI / SAE M1023") - [SAE1020 Indicative](/materials/din-en/sae1020 "AISI / SAE SAE1020") BS United Kingdom · 14 - [050A20 Indicative](/materials/bs/050a20 "BS 050A20") - [055M15 Indicative](/materials/bs/055m15 "BS 055M15") - [055M15-EN2C Indicative](/materials/bs/055m15-en2c "BS 055M15-EN2C") - [070M20 Indicative](/materials/bs/070m20 "BS 070M20") - [070M26 Indicative](/materials/bs/070m26 "BS 070M26") - [1449-22CS Indicative](/materials/bs/1449-22cs "BS 1449-22CS") - [1449-22HS Indicative](/materials/bs/1449-22hs "BS 1449-22HS") - [1C22 Indicative](/materials/bs/1c22 "BS 1C22") - [22HS Indicative](/materials/bs/22hs "BS 22HS") - [2C Indicative](/materials/afnor/2c "BS 2C") - [430 Indicative](/materials/aisi-sae/430 "BS 430") - [C22 Indicative](/materials/is/c22 "BS C22") - [C22E Indicative](/materials/din-en/c22e "BS C22E") - [EN2C Indicative](/materials/bs/en2c "BS EN2C") AFNOR France · 12 - [1C22 Indicative](/materials/bs/1c22 "AFNOR 1C22") - [2C22 Indicative](/materials/afnor/2c22 "AFNOR 2C22") - [AF42 Indicative](/materials/afnor/af42 "AFNOR AF42") - **AF42C20 Indicative** - [C20 Indicative](/materials/afnor/c20 "AFNOR C20") - [C22 Indicative](/materials/is/c22 "AFNOR C22") - [C22E Indicative](/materials/din-en/c22e "AFNOR C22E") - [C25E Indicative](/materials/din-en/c25e "AFNOR C25E") - [CC20 Indicative](/materials/afnor/cc20 "AFNOR CC20") - [XC15 Indicative](/materials/afnor/xc15 "AFNOR XC15") - [XC18 Indicative](/materials/afnor/xc18 "AFNOR XC18") - [XC25 Indicative](/materials/afnor/xc25 "AFNOR XC25") UNE Spain · 5 - [1C22 Indicative](/materials/bs/1c22 "UNE 1C22") - [C22 Indicative](/materials/is/c22 "UNE C22") - [C25k Indicative](/materials/une/c25k "UNE C25k") - [F.112 Indicative](/materials/une/f-112 "UNE F.112") - [F.1120 Indicative](/materials/une/f-1120 "UNE F.1120") ISO International · 1 - [C25 Indicative](/materials/din-en/c25 "ISO C25") JIS Japan · 8 - [S20C Indicative](/materials/jis/s20c "JIS S20C") - [S20CK Indicative](/materials/jis/s20ck "JIS S20CK") - [S22C Indicative](/materials/jis/s22c "JIS S22C") - [STB410 Indicative](/materials/jis/stb410 "JIS STB410") - [STKM12A Indicative](/materials/jis/stkm12a "JIS STKM12A") - [STKM12A-S Indicative](/materials/jis/stkm12a-s "JIS STKM12A-S") - [STKM13B Indicative](/materials/jis/stkm13b "JIS STKM13B") - [STKM13B-W Indicative](/materials/jis/stkm13b-w "JIS STKM13B-W") GB China · 4 - [20 Indicative](/materials/bds/20 "GB 20") - [20G Indicative](/materials/gb/20g "GB 20G") - [20R Indicative](/materials/gb/20r "GB 20R") - [20Z Indicative](/materials/gb/20z "GB 20Z") GOST Russia / CIS · 2 - [20 Indicative](/materials/bds/20 "GOST 20") - [st 20 Indicative](/materials/gost/st-20 "GOST st 20") UNI Italy · 8 - [C18 Indicative](/materials/uni/c18 "UNI C18") - [C20 Indicative](/materials/afnor/c20 "UNI C20") - [C21 Indicative](/materials/din-en/c21 "UNI C21") - [C22 Indicative](/materials/is/c22 "UNI C22") - [C22E Indicative](/materials/din-en/c22e "UNI C22E") - [C22R Indicative](/materials/din-en/c22r "UNI C22R") - [C25 Indicative](/materials/din-en/c25 "UNI C25") - [C25E Indicative](/materials/din-en/c25e "UNI C25E") SS Sweden · 1 - [1450 Indicative](/materials/ss/1450 "SS 1450") ČSN Czechia · 2 - [12022 Indicative](/materials/csn/12022 "ČSN 12022") - [12024 Indicative](/materials/csn/12024 "ČSN 12024") COPANT Latin America · 1 - [1020 Indicative](/materials/aisi-sae/1020 "COPANT 1020") STN Slovakia · 1 - [12 024 Indicative](/materials/csn/12024 "STN 12 024") PN Poland · 2 - [20 Indicative](/materials/bds/20 "PN 20") - [K18 Indicative](/materials/pn/k18 "PN K18") SRPS Serbia · 1 - [Č.1330 Indicative](/materials/srps/c-1330 "SRPS Č.1330") HRN Croatia · 1 - [Č.1330 Indicative](/materials/srps/c-1330 "HRN Č.1330") MSZ Hungary · 2 - [A45.47 Indicative](/materials/msz/a45-47 "MSZ A45.47") - [C22E Indicative](/materials/din-en/c22e "MSZ C22E") AS / NZS Australia / New Zealand · 3 - [1020 Indicative](/materials/aisi-sae/1020 "AS / NZS 1020") - [K1018 Indicative](/materials/as-nzs/k1018 "AS / NZS K1018") - [M1020 Indicative](/materials/aisi-sae/m1020 "AS / NZS M1020") STAS Romania · 2 - [OLC20 Indicative](/materials/stas/olc20 "STAS OLC20") - [OLC20X Indicative](/materials/stas/olc20x "STAS OLC20X") BDS Bulgaria · 3 - [20 Indicative](/materials/bds/20 "BDS 20") - [C22 Indicative](/materials/is/c22 "BDS C22") - [C22E Indicative](/materials/din-en/c22e "BDS C22E") NBN Belgium · 2 - [C25-1 Indicative](/materials/nbn/c25-1 "NBN C25-1") - [C25-2 Indicative](/materials/nbn/c25-2 "NBN C25-2") SNV Switzerland · 1 - [Ck22 Indicative](/materials/din-en/ck22 "SNV Ck22") KS South Korea · 3 - [SM20C Indicative](/materials/ks/sm20c "KS SM20C") - [SM20CK Indicative](/materials/ks/sm20ck "KS SM20CK") - [SM22C Indicative](/materials/ks/sm22c "KS SM22C") 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 Mn Si Cr Iron — the balance, never listed by a standard — 97.9 % Mn — 0.6 % 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 | 0.17–0.24 | | Si | ≤ 0.4 | | Mn | 0.4–0.7 | | P | 0.045 | | S | 0.045 | | Cr | ≤ 0.4 | | Mo | ≤ 0.1 | | 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 | 0,17-0,24 | 0.170 | 0.240 | Range | | Si | ≤0,40 | — | 0.400 | Max | | P | 0,045 | 0.045 | 0.045 | Exact | | S | 0,045 | 0.045 | 0.045 | Exact | | Cr | ≤0,40 | — | 0.400 | Max | | Mn | 0,40-0,70 | 0.400 | 0.700 | 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 812 °C Predicted Ae1 725 °C Predicted Acm 465 °C Predicted Bs 575 °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. ## Properties by condition 1 conditions · 2 values By thickness**Normalized** source `steelnumber` | Thickness mm | Rm N/mm² | A% | |---|---|---| | ≤ 100 | 410 | 25 | 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 1.0, 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. [C25 1.0406 Mn 0,40-0,70 · Si ≤0,40 - ΔMn 0.00 - ΔSi 0.00 - 58 designations](/materials/din-en/c25 "C25")[C26D 1.0415 Mn 0,50-0,80 · Si 0,10-0,30 - ΔMn 0.10 - ΔSi 0.00 - 8 designations](/materials/din-en/c26d "C26D")[1.0501 1.0501 Mn 0,50-0,80 · Si ≤0,40 - ΔMn 0.10 - ΔSi 0.00 - 123 designations](/materials/material-no/1.0501 "1.0501")[C35GPb 1.0502 Mn 0,50-0,80 · Si ≤0,40 - ΔMn 0.10 - ΔSi 0.00 - 2 designations](/materials/din-en/c35gpb "C35GPb")[1.0503 1.0503 Mn 0,50-0,80 · Si ≤0,40 - ΔMn 0.10 - ΔSi 0.00 - 93 designations](/materials/material-no/1.0503 "1.0503")[1.0511 1.0511 Mn 0,50-0,80 · Si ≤0,40 - ΔMn 0.10 - ΔSi 0.00 - 63 designations](/materials/material-no/1.0511 "1.0511") ## 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=0f3225d9-3b20-4ed1-8c9b-bbea365ba867&designation=cdab2ea9-63ec-4e5d-90da-c55af4b50452 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/afnor/af42c20.pdf "Datasheet as PDF")