--- title: "W110Extra — Unalloyed tool steels / carbon steels" description: "W110Extra in AISI / SAE: material number 1.1645, also listed as C105W2. It is a material in the category Unalloyed tool steels / carbon steels." canonical: https://steelequivalents.com/materials/aisi-sae/w110extra language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/aisi-sae/w110extra.md cs: https://steelequivalents.com/cs/materiály/aisi-sae/w110extra.md de: https://steelequivalents.com/de/werkstoffe/aisi-sae/w110extra.md es: https://steelequivalents.com/es/materiales/aisi-sae/w110extra.md fr: https://steelequivalents.com/fr/matériaux/aisi-sae/w110extra.md hu: https://steelequivalents.com/hu/anyagok/aisi-sae/w110extra.md it: https://steelequivalents.com/it/materiali/aisi-sae/w110extra.md nl: https://steelequivalents.com/nl/materialen/aisi-sae/w110extra.md pl: https://steelequivalents.com/pl/materiały/aisi-sae/w110extra.md pt: https://steelequivalents.com/pt/materiais/aisi-sae/w110extra.md ru: https://steelequivalents.com/ru/материалы/aisi-sae/w110extra.md tr: https://steelequivalents.com/tr/malzemeler/aisi-sae/w110extra.md zh: https://steelequivalents.com/zh/材料/aisi-sae/w110extra.md ja: https://steelequivalents.com/ja/材料/aisi-sae/w110extra.md ar: https://steelequivalents.com/ar/المواد/aisi-sae/w110extra.md ko: https://steelequivalents.com/ko/재료/aisi-sae/w110extra.md pt-br: https://steelequivalents.com/pt-br/materiais/aisi-sae/w110extra.md hi: https://steelequivalents.com/hi/सामग्री/aisi-sae/w110extra.md content_hash: sha256:9c3fe87ffc2ce940f3e8a57d3ae24ab0092823ca1e821d141d47f0fc7f3bdd3b 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/w110extra > Canonical URL: https://steelequivalents.com/materials/aisi-sae/w110extra > 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 · 45 designations # W110Extra W110Extra is a designation in AISI / SAE for the material held under material number 1.1645, also listed as C105W2. It is a material in the category Unalloyed tool steels / carbon steels. We list 45 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, ISO, JIS, GB, GOST, UNI, SS, ČSN, PN, MSZ, STAS, BDS, ÖNORM and KS. - [*Material no.* **1.1645**](/materials/material-no/1.1645 "Material no.: 1.1645") - [*Category* **Unalloyed tool steels / carbon steels · 35 grades**](/categories/unalloyed-tool-steels-carbon-steels "Category: Unalloyed tool steels / carbon steels · 35 grades") - *Designations* **45** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=4db5f42e-4fc3-4cff-a1ce-b8307489c1c7&designation=f438e1da-5f8f-4074-b982-920176f4a3e8 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/aisi-sae/w110extra.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN C105W2 This grade’s own name · 2 grades on that route](/materials/din-en/c105w2 "DIN / EN C105W2") ## 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 45 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 · 1 - [C105W2 This grade’s own name](/materials/din-en/c105w2 "DIN / EN C105W2") UNS United States · 1 - [T72301 Indicative](/materials/uns/t72301 "UNS T72301") AISI / SAE United States · 6 - [G51320 Indicative](/materials/uns/g51320 "AISI / SAE G51320") - [T72301 Indicative](/materials/uns/t72301 "AISI / SAE T72301") - [W 1 Indicative](/materials/aisi-sae/w1 "AISI / SAE W 1") - [W1-9 Indicative](/materials/aisi-sae/w1-9 "AISI / SAE W1-9") - [W110 Indicative](/materials/aisi-sae/w110 "AISI / SAE W110") - **W110Extra Indicative** BS United Kingdom · 3 - [1645 Indicative](/materials/bs/1645 "BS 1645") - [BW1A Indicative](/materials/bs/bw1a "BS BW1A") - [BW1B Indicative](/materials/bs/bw1b "BS BW1B") AFNOR France · 4 - [C105E2U Indicative](/materials/afnor/c105e2u "AFNOR C105E2U") - [C120E3U Indicative](/materials/afnor/c120e3u "AFNOR C120E3U") - [Y1-90 Indicative](/materials/afnor/y1-90 "AFNOR Y1-90") - [Y2105 Indicative](/materials/afnor/y2105 "AFNOR Y2105") UNE Spain · 2 - [C102 Indicative](/materials/une/c102 "UNE C102") - [F.5117C102 Indicative](/materials/une/f-5117c102 "UNE F.5117C102") ISO International · 3 - [C105U Indicative](/materials/din-en/c105u "ISO C105U") - [CT105 Indicative](/materials/iso/ct105 "ISO CT105") - [TC105 Indicative](/materials/iso/tc105 "ISO TC105") JIS Japan · 2 - [SK3 Indicative](/materials/jis/sk3 "JIS SK3") - [SK4 Indicative](/materials/jis/sk4 "JIS SK4") GB China · 2 - [T10 Indicative](/materials/gb/t10 "GB T10") - [T11 Indicative](/materials/gb/t11 "GB T11") GOST Russia / CIS · 3 - [U10 Indicative](/materials/bds/u10 "GOST U10") - [U10A Indicative](/materials/bds/u10a "GOST U10A") - [У10 Indicative](/materials/bds/u10 "GOST У10") UNI Italy · 1 - [C100KU Indicative](/materials/uni/c100ku "UNI C100KU") SS Sweden · 1 - [1880 Indicative](/materials/ss/1880 "SS 1880") ČSN Czechia · 3 - [19 192 PH Indicative](/materials/csn/19-192-ph "ČSN 19 192 PH") - [19191 Indicative](/materials/csn/19191 "ČSN 19191") - [19192 Indicative](/materials/csn/19192 "ČSN 19192") PN Poland · 4 - [N10 Indicative](/materials/pn/n10 "PN N10") - [N10E Indicative](/materials/pn/n10e "PN N10E") - [N11 Indicative](/materials/pn/n11 "PN N11") - [N11E Indicative](/materials/pn/n11e "PN N11E") MSZ Hungary · 2 - [S101 Indicative](/materials/msz/s101 "MSZ S101") - [S102 Indicative](/materials/msz/s102 "MSZ S102") STAS Romania · 1 - [OSC10 Indicative](/materials/stas/osc10 "STAS OSC10") BDS Bulgaria · 3 - [U10 Indicative](/materials/bds/u10 "BDS U10") - [U11 Indicative](/materials/gost/u11 "BDS U11") - [U12 Indicative](/materials/bds/u12 "BDS U12") ÖNORM Austria · 2 - [BOHLERK990 Indicative](/materials/onorm/bohlerk990 "ÖNORM BOHLERK990") - [K990 Indicative](/materials/onorm/k990 "ÖNORM K990") KS South Korea · 1 - [STC3 Indicative](/materials/ks/stc3 "KS STC3") 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 — 98.5 % C — 1.1 % Mn — 0.2 % 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 | 1–1.1 | | Si | 0.1–0.3 | | Mn | 0.1–0.35 | | 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 | 1,00-1,10 | 1.000 | 1.100 | 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 | 0,10-0,35 | 0.100 | 0.350 | 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 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. ## 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. [C110U 1.1554 Mn 0,10-0,35 · Si 0,10-0,30 - ΔMn 0.00 - ΔSi 0.00 - 9 designations](/materials/din-en/c110u "C110U")[C125U 1.1563 Mn 0,10-0,35 · Si 0,10-0,30 - ΔMn 0.00 - ΔSi 0.00 - 32 designations](/materials/din-en/c125u "C125U")[C135U 1.1573 Mn 0,10-0,35 · Si 0,10-0,30 - ΔMn 0.00 - ΔSi 0.00 - 3 designations](/materials/din-en/c135u "C135U")[C70W2 1.1620 Mn 0,10-0,35 · Si 0,10-0,30 - ΔMn 0.00 - ΔSi 0.00 - 26 designations](/materials/din-en/c70w2 "C70W2")[C80W2 1.1625 Mn 0,10-0,35 · Si 0,10-0,30 - ΔMn 0.00 - ΔSi 0.00 - 27 designations](/materials/din-en/c80w2 "C80W2")[1.1620 1.1520 Mn 0,10-0,40 · Si 0,10-0,30 - ΔMn 0.03 - ΔSi 0.00 - 21 designations](/materials/material-no/1.1620 "1.1620") ## 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=4db5f42e-4fc3-4cff-a1ce-b8307489c1c7&designation=f438e1da-5f8f-4074-b982-920176f4a3e8 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/aisi-sae/w110extra.pdf "Datasheet as PDF")