--- title: "K1042 — Quenched and tempered steels" description: "K1042 in AS / NZS: material number 1.0503, also listed as C45. Category: Quenched and tempered steels. Designations recorded for this grade: 93." canonical: https://steelequivalents.com/materials/as-nzs/k1042 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/as-nzs/k1042.md cs: https://steelequivalents.com/cs/materiály/as-nzs/k1042.md de: https://steelequivalents.com/de/werkstoffe/as-nzs/k1042.md es: https://steelequivalents.com/es/materiales/as-nzs/k1042.md fr: https://steelequivalents.com/fr/matériaux/as-nzs/k1042.md hu: https://steelequivalents.com/hu/anyagok/as-nzs/k1042.md it: https://steelequivalents.com/it/materiali/as-nzs/k1042.md nl: https://steelequivalents.com/nl/materialen/as-nzs/k1042.md pl: https://steelequivalents.com/pl/materiały/as-nzs/k1042.md pt: https://steelequivalents.com/pt/materiais/as-nzs/k1042.md ru: https://steelequivalents.com/ru/материалы/as-nzs/k1042.md tr: https://steelequivalents.com/tr/malzemeler/as-nzs/k1042.md zh: https://steelequivalents.com/zh/材料/as-nzs/k1042.md ja: https://steelequivalents.com/ja/材料/as-nzs/k1042.md ar: https://steelequivalents.com/ar/المواد/as-nzs/k1042.md ko: https://steelequivalents.com/ko/재료/as-nzs/k1042.md pt-br: https://steelequivalents.com/pt-br/materiais/as-nzs/k1042.md hi: https://steelequivalents.com/hi/सामग्री/as-nzs/k1042.md content_hash: sha256:36dcc7cc97f8cc73ee312e0fc5b072c81ef828819ac13a5a0a2b0c9a8096b20f 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/as-nzs/k1042 > Canonical URL: https://steelequivalents.com/materials/as-nzs/k1042 > 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. AS / NZS · Australia / New Zealand · 93 designations # K1042 K1042 is a designation in AS / NZS for the material held under material number 1.0503, also listed as C45. It is a material in the category Quenched and tempered steels. We list 93 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, SRPS, MSZ, AS / NZS, STAS, BDS, ÖNORM, NBN, SNV and KS. - [*Material no.* **1.0503**](/materials/material-no/1.0503 "Material no.: 1.0503") - [*Category* **Quenched and tempered steels · 133 grades**](/categories/quenched-and-tempered-steels "Category: Quenched and tempered steels · 133 grades") - *Designations* **93** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=05f796db-db02-4ac5-89d7-818cc89d6735&designation=ea755812-53e0-40a7-8199-7b74753e5a77 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/as-nzs/k1042.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN C45 This grade’s own name](/materials/din-en/c45 "DIN / EN C45") - [UNS G10430 This grade’s own name · 4 grades on that route](/materials/uns/g10430 "UNS G10430") - [AISI / SAE 1043 This grade’s own name · 4 grades on that route](/materials/aisi-sae/1043 "AISI / SAE 1043") ## 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 93 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 · 3 - [1.0503 Indicative](/materials/material-no/1.0503 "DIN / EN 1.0503") - [C45 This grade’s own name](/materials/din-en/c45 "DIN / EN C45") - [Gr.1043 Indicative](/materials/din-en/gr-1043 "DIN / EN Gr.1043") UNS United States · 2 - [G10430 This grade’s own name](/materials/uns/g10430 "UNS G10430") - [G10450 This grade’s own name](/materials/uns/g10450 "UNS G10450") AISI / SAE United States · 11 - [1042 Indicative](/materials/aisi-sae/1042 "AISI / SAE 1042") - [1043 This grade’s own name](/materials/aisi-sae/1043 "AISI / SAE 1043") - [1044 Indicative](/materials/aisi-sae/1044 "AISI / SAE 1044") - [1045 This grade’s own name](/materials/aisi-sae/1045 "AISI / SAE 1045") - [1045H Indicative](/materials/aisi-sae/1045h "AISI / SAE 1045H") - [G10420 Indicative](/materials/uns/g10420 "AISI / SAE G10420") - [G10430 Indicative](/materials/uns/g10430 "AISI / SAE G10430") - [G10440 Indicative](/materials/aisi-sae/g10440 "AISI / SAE G10440") - [G10450 Indicative](/materials/uns/g10450 "AISI / SAE G10450") - [Gr.1043 Indicative](/materials/din-en/gr-1043 "AISI / SAE Gr.1043") - [M1044 Indicative](/materials/aisi-sae/m1044 "AISI / SAE M1044") ASTM United States · 1 - [A830 Indicative](/materials/astm/a830 "ASTM A830") BS United Kingdom · 9 - [060A47 Indicative](/materials/bs/060a47 "BS 060A47") - [070M46 Indicative](/materials/bs/070m46 "BS 070M46") - [080M Indicative](/materials/bs/080m "BS 080M") - [080M46 Indicative](/materials/bs/080m46 "BS 080M46") - [1449-50CS Indicative](/materials/bs/1449-50cs "BS 1449-50CS") - [1449-50HS Indicative](/materials/bs/1449-50hs "BS 1449-50HS") - [50HS Indicative](/materials/bs/50hs "BS 50HS") - [C45 Indicative](/materials/din-en/c45 "BS C45") - [C45E Indicative](/materials/din-en/c45e "BS C45E") AFNOR France · 15 - [1C45 Indicative](/materials/afnor/1c45 "AFNOR 1C45") - [2C45 Indicative](/materials/afnor/2c45 "AFNOR 2C45") - [AF65 Indicative](/materials/afnor/af65 "AFNOR AF65") - [AF65C45 Indicative](/materials/afnor/af65c45 "AFNOR AF65C45") - [C40E Indicative](/materials/din-en/c40e "AFNOR C40E") - [C45 Indicative](/materials/din-en/c45 "AFNOR C45") - [C45E Indicative](/materials/din-en/c45e "AFNOR C45E") - [C45RR Indicative](/materials/afnor/c45rr "AFNOR C45RR") - [CC45 Indicative](/materials/afnor/cc45 "AFNOR CC45") - [XC42H1 Indicative](/materials/afnor/xc42h1 "AFNOR XC42H1") - [XC42H1TS Indicative](/materials/afnor/xc42h1ts "AFNOR XC42H1TS") - [XC45 Indicative](/materials/afnor/xc45 "AFNOR XC45") - [XC45H1 Indicative](/materials/afnor/xc45h1 "AFNOR XC45H1") - [XC48 Indicative](/materials/afnor/xc48 "AFNOR XC48") - [XC48H1 Indicative](/materials/afnor/xc48h1 "AFNOR XC48H1") UNE Spain · 7 - [C45 Indicative](/materials/din-en/c45 "UNE C45") - [C45E Indicative](/materials/din-en/c45e "UNE C45E") - [C45k Indicative](/materials/une/c45k "UNE C45k") - [C48k Indicative](/materials/une/c48k "UNE C48k") - [F.114 Indicative](/materials/une/f-114 "UNE F.114") - [F.1140 Indicative](/materials/une/f1140 "UNE F.1140") - [F.1142 Indicative](/materials/une/f-1142 "UNE F.1142") ISO International · 1 - [C45 Indicative](/materials/din-en/c45 "ISO C45") JIS Japan · 4 - [S45C Indicative](/materials/jis/s45c "JIS S45C") - [S48C Indicative](/materials/jis/s48c "JIS S48C") - [SWRCH45K Indicative](/materials/jis/swrch45k "JIS SWRCH45K") - [SWRCH48K Indicative](/materials/jis/swrch48k "JIS SWRCH48K") GB China · 6 - [45 Indicative](/materials/gb/45 "GB 45") - [45H Indicative](/materials/pn/45h "GB 45H") - [ML45 Indicative](/materials/gb/ml45 "GB ML45") - [SM45 Indicative](/materials/gb/sm45 "GB SM45") - [ZG310-570 Indicative](/materials/gb/zg310-570 "GB ZG310-570") - [ZGD345-570 Indicative](/materials/gb/zgd345-570 "GB ZGD345-570") GOST Russia / CIS · 1 - [45 Indicative](/materials/gb/45 "GOST 45") UNI Italy · 6 - [1C45 Indicative](/materials/afnor/1c45 "UNI 1C45") - [C43 Indicative](/materials/uni/c43 "UNI C43") - [C45 Indicative](/materials/din-en/c45 "UNI C45") - [C45E Indicative](/materials/din-en/c45e "UNI C45E") - [C45R Indicative](/materials/din-en/c45r "UNI C45R") - [C46 Indicative](/materials/din-en/c46 "UNI C46") SS Sweden · 2 - [1650 Indicative](/materials/ss/1650 "SS 1650") - [1672 Indicative](/materials/ss/1672 "SS 1672") ČSN Czechia · 2 - [12050 Indicative](/materials/csn/12050 "ČSN 12050") - [12056 Indicative](/materials/csn/12056 "ČSN 12056") STN Slovakia · 1 - [12 050 Indicative](/materials/csn/12050 "STN 12 050") PN Poland · 1 - [45 Indicative](/materials/gb/45 "PN 45") SRPS Serbia · 1 - [Č.1530 Indicative](/materials/srps/c-1530 "SRPS Č.1530") MSZ Hungary · 2 - [A3 Indicative](/materials/din-en/a3 "MSZ A3") - [C45E Indicative](/materials/din-en/c45e "MSZ C45E") AS / NZS Australia / New Zealand · 4 - [1045 Indicative](/materials/aisi-sae/1045 "AS / NZS 1045") - [HK1042 Indicative](/materials/as-nzs/hk1042 "AS / NZS HK1042") - **K1042 Indicative** - [K1045 Indicative](/materials/as-nzs/k1045 "AS / NZS K1045") STAS Romania · 3 - [OLC45 Indicative](/materials/stas/olc45 "STAS OLC45") - [OLC45q Indicative](/materials/stas/olc45q "STAS OLC45q") - [OLC45X Indicative](/materials/stas/olc45x "STAS OLC45X") BDS Bulgaria · 3 - [45 Indicative](/materials/gb/45 "BDS 45") - [C45 Indicative](/materials/din-en/c45 "BDS C45") - [C45E Indicative](/materials/din-en/c45e "BDS C45E") ÖNORM Austria · 1 - [C45SW Indicative](/materials/onorm/c45sw "ÖNORM C45SW") NBN Belgium · 3 - [C45-1 Indicative](/materials/nbn/c45-1 "NBN C45-1") - [C45-2 Indicative](/materials/nbn/c45-2 "NBN C45-2") - [C46 Indicative](/materials/din-en/c46 "NBN C46") SNV Switzerland · 2 - [C45 Indicative](/materials/din-en/c45 "SNV C45") - [Ck45 Indicative](/materials/snv/ck45 "SNV Ck45") KS South Korea · 2 - [SM45C Indicative](/materials/ks/sm45c "KS SM45C") - [SM48C Indicative](/materials/ks/sm48c "KS SM48C") 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 C Si Iron — the balance, never listed by a standard — 97.5 % Mn — 0.7 % C — 0.5 % Si — 0.4 % Traces & impurities · 1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.42–0.5 | | Si | ≤ 0.4 | | Mn | 0.5–0.8 | | 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 | 0,42-0,50 | 0.420 | 0.500 | 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 | 0,50-0,80 | 0.500 | 0.800 | Range | | Ni | ≤0,40 | — | 0.400 | Max | | Mo | ≤0,10 | — | 0.100 | 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 computed from composition · °C Predicted Ae3 764 °C Predicted Ae1 724 °C Predicted Acm 637 °C Predicted Bs 556 °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 5 conditions · 21 values By thickness**Normalized** source `steelnumber` | Thickness mm | Rm N/mm² | A% | |---|---|---| | ≤ 16 | 620 | 14 | | 16 – 100 | 580 | 16 | | 100 – 250 | 560 | 16 | | 250 – 500 | 540 | — | | 500 – 1000 | 530 | — | By thickness**Cold drawn / hard** source `steelnumber` | Thickness mm | Rm N/mm² | A% | |---|---|---| | 5 – 10 | 750 – 1050 | 5 | | 10 – 16 | 710 – 1030 | 6 | | 16 – 40 | 650 – 1000 | 7 | | 40 – 63 | 630 – 900 | 8 | | 63 – 100 | 580 – 850 | 8 | By delivery state**Treated to improve shearability** source `steelnumber` | Delivery state | HB | |---|---| | Treated to improve shearability | 255 | By delivery state**Soft annealed** source `steelnumber` | Delivery state | HB | |---|---| | Soft annealed | 207 | By delivery state**As rolled and turned** source `steelnumber` | Delivery state | HB | |---|---| | As rolled and turned | 172 – 242 | 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 Supply condition - Normalizing and Tempering Supply condition 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/azhlNWIxMzUwOTA_ "Source: www.caishuku.com") ## 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. [C26D 1.0415 Mn 0,50-0,80 · Si 0,10-0,30 - ΔMn 0.00 - ΔSi 0.00 - 8 designations](/materials/din-en/c26d "C26D")[1.0501 1.0501 Mn 0,50-0,80 · Si ≤0,40 - ΔMn 0.00 - ΔSi 0.00 - 123 designations](/materials/material-no/1.0501 "1.0501")[C35GPb 1.0502 Mn 0,50-0,80 · Si ≤0,40 - ΔMn 0.00 - ΔSi 0.00 - 2 designations](/materials/din-en/c35gpb "C35GPb")[1.0511 1.0511 Mn 0,50-0,80 · Si ≤0,40 - ΔMn 0.00 - ΔSi 0.00 - 63 designations](/materials/material-no/1.0511 "1.0511")[1.0528 1.0528 Mn 0,50-0,80 · Si ≤0,40 - ΔMn 0.00 - ΔSi 0.00 - 54 designations](/materials/material-no/1.0528 "1.0528")[C42D 1.0541 Mn 0,50-0,80 · Si 0,10-0,30 - ΔMn 0.00 - ΔSi 0.00 - 5 designations](/materials/din-en/c42d "C42D") ## 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=05f796db-db02-4ac5-89d7-818cc89d6735&designation=ea755812-53e0-40a7-8199-7b74753e5a77 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/as-nzs/k1042.pdf "Datasheet as PDF")