--- title: "1.1231 — Spring steels" description: "1.1231 is the material number of the grade also listed as C67S. It is a material in the category Spring steels. Designations recorded for this grade: 42." canonical: https://steelequivalents.com/materials/material-no/1.1231 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/material-no/1.1231.md cs: https://steelequivalents.com/cs/materiály/číslo-materiálu/1.1231.md de: https://steelequivalents.com/de/werkstoffe/werkstoff-nr/1.1231.md es: https://steelequivalents.com/es/materiales/número-de-material/1.1231.md fr: https://steelequivalents.com/fr/matériaux/numéro-de-matériau/1.1231.md hu: https://steelequivalents.com/hu/anyagok/anyagszám/1.1231.md it: https://steelequivalents.com/it/materiali/numero-materiale/1.1231.md nl: https://steelequivalents.com/nl/materialen/materiaalnummer/1.1231.md pl: https://steelequivalents.com/pl/materiały/numer-materiału/1.1231.md pt: https://steelequivalents.com/pt/materiais/número-do-material/1.1231.md ru: https://steelequivalents.com/ru/материалы/номер-материала/1.1231.md tr: https://steelequivalents.com/tr/malzemeler/malzeme-numarası/1.1231.md zh: https://steelequivalents.com/zh/材料/材料编号/1.1231.md ja: https://steelequivalents.com/ja/材料/材料番号/1.1231.md ar: https://steelequivalents.com/ar/المواد/رقم-المادة/1.1231.md ko: https://steelequivalents.com/ko/재료/재료번호/1.1231.md pt-br: https://steelequivalents.com/pt-br/materiais/número-do-material/1.1231.md hi: https://steelequivalents.com/hi/सामग्री/सामग्री-संख्या/1.1231.md content_hash: sha256:da825c4cac218c5c976bcd8d09f2189513d8a87dee31927c2a600156f90606ee 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/material-no/1.1231 > Canonical URL: https://steelequivalents.com/materials/material-no/1.1231 > 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. Material number · Europe · 42 designations # 1.1231 1.1231 is the material number of the grade also listed as C67S. It is a material in the category Spring steels. We list 42 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, ISO, JIS, GB, GOST, UNI, SS, ČSN, ABNT NBR, COPANT, STN, PN, AS / NZS, STAS and BDS. - ***Material no.* **1.1231**** - [*Category* **Spring steels · 52 grades**](/categories/spring-steels "Category: Spring steels · 52 grades") - *Designations* **42** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=5f077dac-4589-4b74-9ab7-2ae31f02c245 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.1231.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN C67S This grade’s own name](/materials/din-en/c67s "DIN / EN C67S") - [UNS G10700 This grade’s own name · 7 grades on that route](/materials/uns/g10700 "UNS G10700") - [AISI / SAE 1070 This grade’s own name · 7 grades on that route](/materials/aisi-sae/1070 "AISI / SAE 1070") ## About Spring steels Spring steels are alloy steels designed to store and release elastic energy repeatedly without permanent deformation. They are characterised by a combination of strength, hardness and resilience, making them suitable for springs, clips, washers and other components subjected to repeated flexing or shock. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 42 designations · 19 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 - [C67S This grade’s own name](/materials/din-en/c67s "DIN / EN C67S") - [Ck 67 This grade’s own name Withdrawn](/materials/din-en/ck-67 "DIN / EN Ck 67") UNS United States · 1 - [G10700 This grade’s own name](/materials/uns/g10700 "UNS G10700") AISI / SAE United States · 8 - [1065 Indicative](/materials/aisi-sae/1065 "AISI / SAE 1065") - [1069 Indicative](/materials/aisi-sae/1069 "AISI / SAE 1069") - [1070 This grade’s own name](/materials/aisi-sae/1070 "AISI / SAE 1070") - [1566 Indicative](/materials/aisi-sae/1566 "AISI / SAE 1566") - [G10690 Indicative](/materials/uns/g10690 "AISI / SAE G10690") - [G10700 Indicative](/materials/uns/g10700 "AISI / SAE G10700") - [G15660 Indicative](/materials/uns/g15660 "AISI / SAE G15660") - [J403 Indicative](/materials/aisi-sae/j403 "AISI / SAE J403") BS United Kingdom · 3 - [060A67 Indicative](/materials/bs/060a67 "BS 060A67") - [070A72 Indicative](/materials/bs/070a72 "BS 070A72") - [CS70 Indicative](/materials/bs/cs70 "BS CS70") AFNOR France · 4 - [C68RR Indicative](/materials/afnor/c68rr "AFNOR C68RR") - [FMR70 Indicative](/materials/afnor/fmr70 "AFNOR FMR70") - [FMR72 Indicative](/materials/afnor/fmr72 "AFNOR FMR72") - [XC68 Indicative](/materials/afnor/xc68 "AFNOR XC68") ISO International · 1 - [CS65 Indicative](/materials/iso/cs65 "ISO CS65") JIS Japan · 3 - [S 70 C Indicative](/materials/jis/s70c "JIS S 70 C") - [S65CM Indicative](/materials/jis/s65cm "JIS S65CM") - [S70C-CSP Indicative](/materials/jis/s70c-csp "JIS S70C-CSP") GB China · 2 - [65 Indicative](/materials/gb/65 "GB 65") - [70 Indicative](/materials/gb/70 "GB 70") GOST Russia / CIS · 4 - [65 Indicative](/materials/gb/65 "GOST 65") - [68GА Indicative](/materials/gost/68ga "GOST 68GА") - [68ГА Indicative](/materials/gost/68ga "GOST 68ГА") - [70 Indicative](/materials/gb/70 "GOST 70") UNI Italy · 1 - [C70 Indicative](/materials/uni/c70 "UNI C70") SS Sweden · 1 - [1770 Indicative](/materials/ss/1770 "SS 1770") ČSN Czechia · 2 - [12 061 Indicative](/materials/csn/12061 "ČSN 12 061") - [12071 Indicative](/materials/csn/12071 "ČSN 12071") ABNT NBR Brazil · 1 - [1070 Indicative](/materials/aisi-sae/1070 "ABNT NBR 1070") COPANT Latin America · 1 - [1070 Indicative](/materials/aisi-sae/1070 "COPANT 1070") STN Slovakia · 1 - [12061 Indicative](/materials/csn/12061 "STN 12061") PN Poland · 2 - [D70 Indicative](/materials/pn/d70 "PN D70") - [gat. 65 Indicative](/materials/pn/gat-65 "PN gat. 65") AS / NZS Australia / New Zealand · 2 - [1070 Indicative](/materials/aisi-sae/1070 "AS / NZS 1070") - [K1070S Indicative](/materials/as-nzs/k1070s "AS / NZS K1070S") STAS Romania · 2 - [OLC66S Indicative](/materials/stas/olc66s "STAS OLC66S") - [OLC70A Indicative](/materials/stas/olc70a "STAS OLC70A") BDS Bulgaria · 1 - [70 Indicative](/materials/gb/70 "BDS 70") 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 Cr Iron — the balance, never listed by a standard — 97.4 % Mn — 0.8 % C — 0.7 % 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 | 0.65–0.73 | | Si | 0.15–0.35 | | Mn | 0.6–0.9 | | P | 0.025 | | S | 0.025 | | 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 | 0,65-0,73 | 0.650 | 0.730 | Range | | Si | 0,15-0,35 | 0.150 | 0.350 | Range | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,025 | 0.025 | 0.025 | Exact | | Cr | ≤0,40 | — | 0.400 | Max | | Mn | 0,60-0,90 | 0.600 | 0.900 | 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 This grade's composition falls outside the published model's validated range (a low-alloy composition window), so no transformation temperature is predicted here. ## 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 6 conditions · 7 values By thickness**Soft annealed** source `steelnumber` | Thickness mm | Rm N/mm² | A80% | |---|---|---| | 0.3 – 3 | 640 | 16 | By thickness**Cold rolled** source `steelnumber` | Thickness mm | Rm N/mm² | |---|---| | 0.3 – 3 | 1140 | By thickness**Quenched and tempered** source `steelnumber` | Thickness mm | Rm N/mm² | |---|---| | 0.3 – 3 | 1200 – 1900 | By delivery state**Soft annealed** source `steelnumber` | Delivery state | HV | |---|---| | Soft annealed | 200 | By delivery state**Cold rolled** source `steelnumber` | Delivery state | HV | |---|---| | Cold rolled | 315 | By delivery state**Quenched and tempered** source `steelnumber` | Delivery state | HV | |---|---| | Quenched and tempered | 370 – 580 | 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 1.1, 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. [C60S 1.1211 Mn 0,60-0,90 · Si 0,15-0,35 - ΔMn 0.00 - ΔSi 0.00 - 8 designations](/materials/din-en/c60s "C60S")[C75S 1.1248 Mn 0,60-0,90 · Si 0,15-0,35 - ΔMn 0.00 - ΔSi 0.00 - 21 designations](/materials/din-en/c75s "C75S")[C85S 1.1269 Mn 0,40-0,70 · Si 0,15-0,35 - ΔMn 0.20 - ΔSi 0.00 - 33 designations](/materials/din-en/c85s "C85S")[C78D2 1.1252 Mn 0,50-0,70 · Si 0,10-0,30 - ΔMn 0.15 - ΔSi 0.05 - 5 designations](/materials/din-en/c78d2 "C78D2")[C76D2 1.1253 Mn 0,50-0,70 · Si 0,10-0,30 - ΔMn 0.15 - ΔSi 0.05 - 5 designations](/materials/din-en/c76d2 "C76D2")[C86D2 1.1265 Mn 0,50-0,70 · Si 0,10-0,30 - ΔMn 0.15 - ΔSi 0.05 - 6 designations](/materials/din-en/c86d2 "C86D2") ## 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=5f077dac-4589-4b74-9ab7-2ae31f02c245 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.1231.pdf "Datasheet as PDF")