--- title: "W1-8 — Unalloyed tool steels / carbon steels" description: "W1-8 in AISI / SAE: material number 1.1525, also listed as C80U. Category: Unalloyed tool steels / carbon steels. Designations recorded for this grade: 44." canonical: https://steelequivalents.com/materials/aisi-sae/w1-8 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/aisi-sae/w1-8.md cs: https://steelequivalents.com/cs/materiály/aisi-sae/w1-8.md de: https://steelequivalents.com/de/werkstoffe/aisi-sae/w1-8.md es: https://steelequivalents.com/es/materiales/aisi-sae/w1-8.md fr: https://steelequivalents.com/fr/matériaux/aisi-sae/w1-8.md hu: https://steelequivalents.com/hu/anyagok/aisi-sae/w1-8.md it: https://steelequivalents.com/it/materiali/aisi-sae/w1-8.md nl: https://steelequivalents.com/nl/materialen/aisi-sae/w1-8.md pl: https://steelequivalents.com/pl/materiały/aisi-sae/w1-8.md pt: https://steelequivalents.com/pt/materiais/aisi-sae/w1-8.md ru: https://steelequivalents.com/ru/материалы/aisi-sae/w1-8.md tr: https://steelequivalents.com/tr/malzemeler/aisi-sae/w1-8.md zh: https://steelequivalents.com/zh/材料/aisi-sae/w1-8.md ja: https://steelequivalents.com/ja/材料/aisi-sae/w1-8.md ar: https://steelequivalents.com/ar/المواد/aisi-sae/w1-8.md ko: https://steelequivalents.com/ko/재료/aisi-sae/w1-8.md pt-br: https://steelequivalents.com/pt-br/materiais/aisi-sae/w1-8.md hi: https://steelequivalents.com/hi/सामग्री/aisi-sae/w1-8.md content_hash: sha256:008a82b59b432c67f12c895a5fc69f0b5ca568f7a62ec873ceadc202f96122b2 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/aisi-sae/w1-8 > Canonical URL: https://steelequivalents.com/materials/aisi-sae/w1-8 > 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. AISI / SAE · United States · 44 designations # W1-8 W1-8 is a designation in AISI / SAE for the material held under material number 1.1525, also listed as C80U. It is a material in the category Unalloyed tool steels / carbon steels. We list 44 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, UNE, ISO, JIS, GB, GOST, UNI, ČSN, STN, SRPS, PN, MSZ, STAS, BDS, ÖNORM and KS. - [*Material no.* **1.1525**](/materials/material-no/1.1525 "Material no.: 1.1525") - [*Category* **Unalloyed tool steels / carbon steels · 35 grades**](/categories/unalloyed-tool-steels-carbon-steels "Category: Unalloyed tool steels / carbon steels · 35 grades") - *Designations* **44** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=ca7ac7af-b32a-44aa-9bbb-77884d5b89e6&designation=ccf89e07-31db-476a-b356-b05b49462a70 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/aisi-sae/w1-8.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN C80U This grade’s own name](/materials/din-en/c80u "DIN / EN C80U") - [AISI / SAE W108 This grade’s own name](/materials/aisi-sae/w108 "AISI / SAE W108") ## About Unalloyed tool steels / carbon steels Unalloyed tool steels are carbon steels whose working properties are developed primarily through carbon content and heat treatment. They are characterised by high attainable hardness and wear resistance, and are used for cutting tools, punches, dies, gauges and other tooling where edge retention and resistance to deformation are important. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 44 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 · 3 - [C80U This grade’s own name](/materials/din-en/c80u "DIN / EN C80U") - [C80W1 This grade’s own name Withdrawn](/materials/din-en/c80w1 "DIN / EN C80W1") - [C80W2 Indicative](/materials/din-en/c80w2 "DIN / EN C80W2") UNS United States · 1 - [T72301 Indicative](/materials/uns/t72301 "UNS T72301") AISI / SAE United States · 6 - [W1 Indicative](/materials/aisi-sae/w1 "AISI / SAE W1") - [W1-7 Indicative](/materials/aisi-sae/w1-7 "AISI / SAE W1-7") - **W1-8 Indicative** - [W108 This grade’s own name](/materials/aisi-sae/w108 "AISI / SAE W108") - [W108Extra Indicative](/materials/aisi-sae/w108extra "AISI / SAE W108Extra") - [W1C 0,80% This grade’s own name](/materials/aisi-sae/w1c-0-80 "AISI / SAE W1C 0,80%") ASTM United States · 1 - [W1A-8 Indicative](/materials/astm/w1a-8 "ASTM W1A-8") BS United Kingdom · 1 - [BW1A Indicative](/materials/bs/bw1a "BS BW1A") AFNOR France · 3 - [C90E2U Indicative](/materials/afnor/c90e2u "AFNOR C90E2U") - [Y1-90 Indicative](/materials/afnor/y1-90 "AFNOR Y1-90") - [Y180 Indicative](/materials/afnor/y180 "AFNOR Y180") UNE Spain · 1 - [F-513 Indicative](/materials/une/f-513 "UNE F-513") ISO International · 2 - [C80U Indicative](/materials/din-en/c80u "ISO C80U") - [TC80 Indicative](/materials/iso/tc80 "ISO TC80") JIS Japan · 4 - [SK5 Indicative](/materials/jis/sk5 "JIS SK5") - [SK6 Indicative](/materials/jis/sk6 "JIS SK6") - [SK75 Indicative](/materials/jis/sk75 "JIS SK75") - [SK85 Indicative](/materials/jis/sk85 "JIS SK85") GB China · 1 - [T8 Indicative](/materials/gb/t8 "GB T8") GOST Russia / CIS · 6 - [U8 Indicative](/materials/gost/u8 "GOST U8") - [U8A Indicative](/materials/gost/u8a "GOST U8A") - [U8G Indicative](/materials/gost/u8g "GOST U8G") - [U9 Indicative](/materials/gost/u9 "GOST U9") - [У8Г Indicative](/materials/gost/u8g "GOST У8Г") - [У9 Indicative](/materials/gost/u9 "GOST У9") UNI Italy · 2 - [C80KU Indicative](/materials/uni/c80ku "UNI C80KU") - [C90KU Indicative](/materials/uni/c90ku "UNI C90KU") ČSN Czechia · 1 - [19152 Indicative](/materials/csn/19152 "ČSN 19152") STN Slovakia · 1 - [19 152 Indicative](/materials/csn/19152 "STN 19 152") SRPS Serbia · 1 - [Č.1840 Indicative](/materials/srps/c-1840 "SRPS Č.1840") PN Poland · 3 - [N8 Indicative](/materials/pn/n8 "PN N8") - [N8E Indicative](/materials/pn/n8e "PN N8E") - [N9 Indicative](/materials/pn/n9 "PN N9") MSZ Hungary · 2 - [S91 Indicative](/materials/msz/s91 "MSZ S91") - [S92 Indicative](/materials/msz/s92 "MSZ S92") STAS Romania · 1 - [OSC8 Indicative](/materials/stas/osc8 "STAS OSC8") BDS Bulgaria · 1 - [U9 Indicative](/materials/gost/u9 "BDS U9") ÖNORM Austria · 1 - [K980 Indicative](/materials/onorm/k980 "ÖNORM K980") KS South Korea · 2 - [STC5 Indicative](/materials/ks/stc5 "KS STC5") - [STC6 Indicative](/materials/ks/stc6 "KS STC6") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 5 elements on file · weight % What this alloy is Fe C Mn Si Iron — the balance, never listed by a standard — 98.7 % C — 0.8 % Mn — 0.3 % Si — 0.2 % Traces & impurities · 0.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.75–0.85 | | Si | 0.1–0.3 | | Mn | 0.1–0.4 | | P | 0.03 | | S | 0.03 | Carbon Silicon Manganese Phosphorus Sulfur 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 | 0,75-0,85 | 0.750 | 0.850 | Range | | Si | 0,10-0,30 | 0.100 | 0.300 | Range | | P | 0,03 | 0.030 | 0.030 | Exact | | S | 0,03 | 0.030 | 0.030 | Exact | | Mn | 0,10-0,40 | 0.100 | 0.400 | Range | 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 Not enough recorded composition to predict a transformation temperature for this grade — missing: Ni, Cr, Mo. ## Physical & mechanical properties Density 7,85 g/cm³ Exact Transformation point Ac1 720 °C Exact Transformation point Ar1 700 °C Exact Weldability not suitable for welding As published: is not used. 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 · 59 values By delivery state**no delivery state stated** source `steeljis` | Delivery state | HB | HRC | |---|---|---| | ( SK5 ) Annealed | 207 | — | | ( SK5 ) Quenched and tempered | — | 59 | By delivery state**Soft annealed** source `steelnumber` | Delivery state | HB | |---|---| | Soft annealed | 192 | By dimension**Quenching 780°C, oil, Drawing 400°C** source `splav` | Dimension mm | Rm N/mm² | Re N/mm² | A5% | Z% | |---|---|---|---|---| | 6 | 1420 | 1230 | 10 | 37 | By dimension**no delivery state stated** source `splav` | Dimension mm | Rm N/mm² | A5% | |---|---|---| | 1.5 | 750 | 10 | By delivery state**no delivery state stated** source `splav` | Delivery state | HB | |---|---| | (annealing) , GOST 1435-99 | 187 | 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 | 7.839 | 209 | — | — | — | — | | 100 | 7.817 | 205 | 11.4 | 49 | 477 | 230 | | 200 | 7.786 | 199 | 12.2 | 46 | 511 | 305 | | 300 | 7.752 | 192 | 13 | 42 | 528 | 395 | | 400 | 7.714 | 185 | 13.7 | 38 | 548 | 491 | | 500 | 7.676 | 175 | 14.3 | 35 | 565 | 625 | | 600 | 7.638 | 166 | 14.8 | 33 | 594 | 769 | | 700 | 7.6 | — | 15.2 | 30 | 624 | 931 | | 800 | 7.852 | — | 14.5 | 24 | 724 | 1129 | | 900 | — | — | — | — | — | 1165 | 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. [1.1620 1.1520 Mn 0,10-0,40 · Si 0,10-0,30 - ΔMn 0.00 - ΔSi 0.00 - 21 designations](/materials/material-no/1.1620 "1.1620")[C105W2 1.1535 Mn 0,10-0,40 · Si 0,10-0,30 - ΔMn 0.00 - ΔSi 0.00 - 26 designations](/materials/din-en/c105w2 "C105W2")[1.1545 1.1545 Mn 0,10-0,40 · Si 0,10-0,30 - ΔMn 0.00 - ΔSi 0.00 - 67 designations](/materials/material-no/1.1545 "1.1545")[C110W1 1.1555 Mn 0,10-0,40 · Si 0,10-0,30 - ΔMn 0.00 - ΔSi 0.00 - 31 designations](/materials/din-en/c110w1 "C110W1")[C110U 1.1554 Mn 0,10-0,35 · Si 0,10-0,30 - ΔMn 0.03 - ΔSi 0.00 - 9 designations](/materials/din-en/c110u "C110U")[C125U 1.1563 Mn 0,10-0,35 · Si 0,10-0,30 - ΔMn 0.03 - ΔSi 0.00 - 32 designations](/materials/din-en/c125u "C125U") ## 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=ca7ac7af-b32a-44aa-9bbb-77884d5b89e6&designation=ccf89e07-31db-476a-b356-b05b49462a70 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/aisi-sae/w1-8.pdf "Datasheet as PDF")