--- title: "C100 — Spring steels" description: "C100 in UNI: material number 1.1274, also listed as C100S. It is a material in the category Spring steels. Designations recorded for this grade: 26." canonical: https://steelequivalents.com/materials/uni/c100 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/uni/c100.md cs: https://steelequivalents.com/cs/materiály/uni/c100.md de: https://steelequivalents.com/de/werkstoffe/uni/c100.md es: https://steelequivalents.com/es/materiales/uni/c100.md fr: https://steelequivalents.com/fr/matériaux/uni/c100.md hu: https://steelequivalents.com/hu/anyagok/uni/c100.md it: https://steelequivalents.com/it/materiali/uni/c100.md nl: https://steelequivalents.com/nl/materialen/uni/c100.md pl: https://steelequivalents.com/pl/materiały/uni/c100.md pt: https://steelequivalents.com/pt/materiais/uni/c100.md ru: https://steelequivalents.com/ru/материалы/uni/c100.md tr: https://steelequivalents.com/tr/malzemeler/uni/c100.md zh: https://steelequivalents.com/zh/材料/uni/c100.md ja: https://steelequivalents.com/ja/材料/uni/c100.md ar: https://steelequivalents.com/ar/المواد/uni/c100.md ko: https://steelequivalents.com/ko/재료/uni/c100.md pt-br: https://steelequivalents.com/pt-br/materiais/uni/c100.md hi: https://steelequivalents.com/hi/सामग्री/uni/c100.md content_hash: sha256:3a3fcff44840ef713c9da71a09b414d4d8658056df8d93bce610455199950d32 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/uni/c100 > Canonical URL: https://steelequivalents.com/materials/uni/c100 > 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. UNI · Italy · 26 designations # C100 C100 is a designation in UNI for the material held under material number 1.1274, also listed as C100S. It is a material in the category Spring steels. We list 26 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, ISO, JIS, UNI, SS, ABNT NBR, COPANT, AS / NZS and STAS. - [*Material no.* **1.1274**](/materials/material-no/1.1274 "Material no.: 1.1274") - [*Category* **Spring steels · 52 grades**](/categories/spring-steels "Category: Spring steels · 52 grades") - *Designations* **26** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=fa868e04-fe8e-44ba-aaaa-1b43b515024e&designation=e60fd2f5-67f2-41c9-8948-2b9c01552e31 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uni/c100.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN C100S This grade’s own name](/materials/din-en/c100s "DIN / EN C100S") - [UNS G10950 This grade’s own name · 4 grades on that route](/materials/uns/g10950 "UNS G10950") - [AISI / SAE 1095 This grade’s own name · 5 grades on that route](/materials/aisi-sae/1095 "AISI / SAE 1095") ## 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 26 designations · 14 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 - [1.1274 Indicative](/materials/material-no/1.1274 "DIN / EN 1.1274") - [C100S This grade’s own name](/materials/din-en/c100s "DIN / EN C100S") - [Ck 101 This grade’s own name Withdrawn](/materials/din-en/ck-101 "DIN / EN Ck 101") UNS United States · 1 - [G10950 This grade’s own name](/materials/uns/g10950 "UNS G10950") AISI / SAE United States · 1 - [1095 This grade’s own name](/materials/aisi-sae/1095 "AISI / SAE 1095") BS United Kingdom · 3 - [060A96 Indicative](/materials/bs/060a96 "BS 060A96") - [CS95 Indicative](/materials/bs/cs95 "BS CS95") - [HS95 Indicative](/materials/bs/hs95 "BS HS95") AFNOR France · 3 - [C100RR Indicative](/materials/afnor/c100rr "AFNOR C100RR") - [E100 Indicative](/materials/afnor/e100 "AFNOR E100") - [XC100 Indicative](/materials/afnor/xc100 "AFNOR XC100") UNE Spain · 3 - [A-5117 Indicative](/materials/une/a-5117 "UNE A-5117") - [C 102 Indicative](/materials/une/c102 "UNE C 102") - [F.5117 Indicative](/materials/une/f-5117 "UNE F.5117") ISO International · 1 - [CS95 Indicative](/materials/bs/cs95 "ISO CS95") JIS Japan · 4 - [SK 4 Indicative](/materials/jis/sk4 "JIS SK 4") - [SK4-CSP Indicative](/materials/jis/sk4-csp "JIS SK4-CSP") - [SK95-CSP Indicative](/materials/ks/sk95-csp "JIS SK95-CSP") - [SUP 4 Indicative](/materials/jis/sup4 "JIS SUP 4") UNI Italy · 2 - **C100 Indicative** - [E4 Indicative](/materials/din-en/e4 "UNI E4") SS Sweden · 1 - [1870 Indicative](/materials/ss/1870 "SS 1870") ABNT NBR Brazil · 1 - [1095 Indicative](/materials/aisi-sae/1095 "ABNT NBR 1095") COPANT Latin America · 1 - [1095 Indicative](/materials/aisi-sae/1095 "COPANT 1095") AS / NZS Australia / New Zealand · 1 - [K1095 Indicative](/materials/as-nzs/k1095 "AS / NZS K1095") STAS Romania · 1 - [OSC 10 Indicative](/materials/stas/osc10 "STAS OSC 10") 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 C Mn Cr Iron — the balance, never listed by a standard — 97.4 % C — 1 % Mn — 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 | 0.95–1.05 — Unusual | | Si | 0.15–0.35 | | Mn | 0.3–0.6 | | 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 | 0,95-1,05 | 0.950 | 1.050 | 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 | 0,30-0,60 | 0.300 | 0.600 | 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 | 690 | 13 | By thickness**Cold rolled** source `steelnumber` | Thickness mm | Rm N/mm² | |---|---| | 0.3 – 3 | 1200 | By thickness**Quenched and tempered** source `steelnumber` | Thickness mm | Rm N/mm² | |---|---| | 0.3 – 3 | 1200 – 2100 | By delivery state**Soft annealed** source `steelnumber` | Delivery state | HV | |---|---| | Soft annealed | 220 | By delivery state**Cold rolled** source `steelnumber` | Delivery state | HV | |---|---| | Cold rolled | 325 | By delivery state**Quenched and tempered** source `steelnumber` | Delivery state | HV | |---|---| | Quenched and tempered | 370 – 630 | 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. [C85S 1.1269 Mn 0,40-0,70 · Si 0,15-0,35 - ΔMn 0.10 - 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")[C60S 1.1211 Mn 0,60-0,90 · Si 0,15-0,35 - ΔMn 0.30 - ΔSi 0.00 - 8 designations](/materials/din-en/c60s "C60S")[C67S 1.1231 Mn 0,60-0,90 · Si 0,15-0,35 - ΔMn 0.30 - ΔSi 0.00 - 42 designations](/materials/din-en/c67s "C67S") ## 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=fa868e04-fe8e-44ba-aaaa-1b43b515024e&designation=e60fd2f5-67f2-41c9-8948-2b9c01552e31 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uni/c100.pdf "Datasheet as PDF")