--- title: "N12E — Unalloyed tool steels / carbon steels" description: "N12E in PN: material number 1.1555, also listed as C120U. Category: Unalloyed tool steels / carbon steels. Designations recorded for this grade: 31." canonical: https://steelequivalents.com/materials/pn/n12e language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/pn/n12e.md cs: https://steelequivalents.com/cs/materiály/pn/n12e.md de: https://steelequivalents.com/de/werkstoffe/pn/n12e.md es: https://steelequivalents.com/es/materiales/pn/n12e.md fr: https://steelequivalents.com/fr/matériaux/pn/n12e.md hu: https://steelequivalents.com/hu/anyagok/pn/n12e.md it: https://steelequivalents.com/it/materiali/pn/n12e.md nl: https://steelequivalents.com/nl/materialen/pn/n12e.md pl: https://steelequivalents.com/pl/materiały/pn/n12e.md pt: https://steelequivalents.com/pt/materiais/pn/n12e.md ru: https://steelequivalents.com/ru/материалы/pn/n12e.md tr: https://steelequivalents.com/tr/malzemeler/pn/n12e.md zh: https://steelequivalents.com/zh/材料/pn/n12e.md ja: https://steelequivalents.com/ja/材料/pn/n12e.md ar: https://steelequivalents.com/ar/المواد/pn/n12e.md ko: https://steelequivalents.com/ko/재료/pn/n12e.md pt-br: https://steelequivalents.com/pt-br/materiais/pn/n12e.md hi: https://steelequivalents.com/hi/सामग्री/pn/n12e.md content_hash: sha256:3a52fb1e6d38abf82adadadb048872e73dd0e688cfea9121520541d282c9b375 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/pn/n12e > Canonical URL: https://steelequivalents.com/materials/pn/n12e > 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. PN · Poland · 31 designations # N12E N12E is a designation in PN for the material held under material number 1.1555, also listed as C120U. It is a material in the category Unalloyed tool steels / carbon steels. We list 31 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, ISO, JIS, GB, GOST, UNI, ČSN, STN, PN, MSZ, BDS and ÖNORM. - [*Material no.* **1.1555**](/materials/material-no/1.1555 "Material no.: 1.1555") - [*Category* **Unalloyed tool steels / carbon steels · 35 grades**](/categories/unalloyed-tool-steels-carbon-steels "Category: Unalloyed tool steels / carbon steels · 35 grades") - *Designations* **31** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=80aa5f56-8757-4ec4-8492-1332d8283b1d&designation=9d4feaed-6ccd-4394-844d-c8d35296829d "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/pn/n12e.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN C120U This grade’s own name · 2 grades on that route](/materials/din-en/c120u "DIN / EN C120U") - [AISI / SAE W112 This grade’s own name · 2 grades on that route](/materials/aisi-sae/w112 "AISI / SAE W112") ## 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 31 designations · 17 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 - [C110W1 Indicative](/materials/din-en/c110w1 "DIN / EN C110W1") - [C120U This grade’s own name](/materials/din-en/c120u "DIN / EN C120U") - [C125W Indicative](/materials/din-en/c125w "DIN / EN C125W") UNS United States · 1 - [T72301 Indicative](/materials/uns/t72301 "UNS T72301") AISI / SAE United States · 3 - [W1-11-1/2 Indicative](/materials/aisi-sae/w1-11-1-2 "AISI / SAE W1-11-1/2") - [W112 This grade’s own name](/materials/aisi-sae/w112 "AISI / SAE W112") - [W1C 1,20% This grade’s own name](/materials/aisi-sae/w1c-1-20 "AISI / SAE W1C 1,20%") BS United Kingdom · 1 - [BW1C Indicative](/materials/bs/bw1c "BS BW1C") AFNOR France · 2 - [C120E3U Indicative](/materials/afnor/c120e3u "AFNOR C120E3U") - [Y2120 Indicative](/materials/afnor/y2120 "AFNOR Y2120") UNE Spain · 2 - [C120 Indicative](/materials/une/c120 "UNE C120") - [F-1523 Indicative](/materials/une/f-1523 "UNE F-1523") ISO International · 1 - [C120U Indicative](/materials/din-en/c120u "ISO C120U") JIS Japan · 2 - [SK120 Indicative](/materials/jis/sk120 "JIS SK120") - [SK2 Indicative](/materials/jis/sk2 "JIS SK2") GB China · 3 - [T00123 Indicative](/materials/gb/t00123 "GB T00123") - [T11 Indicative](/materials/gb/t11 "GB T11") - [T12A Indicative](/materials/gb/t12a "GB T12A") GOST Russia / CIS · 3 - [u12 Indicative](/materials/bds/u12 "GOST u12") - [У12 Indicative](/materials/bds/u12 "GOST У12") - [У12A Indicative](/materials/gost/u12a "GOST У12A") UNI Italy · 1 - [C120KU Indicative](/materials/uni/c120ku "UNI C120KU") ČSN Czechia · 2 - [19221 Indicative](/materials/csn/19221 "ČSN 19221") - [19225 Indicative](/materials/csn/19225 "ČSN 19225") STN Slovakia · 1 - [19 221 Indicative](/materials/csn/19221 "STN 19 221") PN Poland · 2 - [N12 Indicative](/materials/pn/n12 "PN N12") - **N12E Indicative** MSZ Hungary · 2 - [S121 Indicative](/materials/msz/s121 "MSZ S121") - [S122 Indicative](/materials/msz/s122 "MSZ S122") BDS Bulgaria · 1 - [U12 Indicative](/materials/bds/u12 "BDS U12") ÖNORM Austria · 1 - [K990 Indicative](/materials/onorm/k990 "ÖNORM K990") 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 — 98.3 % C — 1.2 % 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 | 1.15–1.25 | | 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 | 1,15-1,25 | 1.150 | 1.250 | 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 730 °C Exact Transformation point Ac3 820 °C Exact · Ac3(Acm) 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 5 conditions · 64 values By delivery state**Soft annealed** source `steelnumber` | Delivery state | HB | |---|---| | Soft annealed | 217 | By dimension**no delivery state stated** source `splav` | Dimension mm | Rm N/mm² | A5% | |---|---|---| | 0.08 - 3 | 750 | 10 | By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Rm N/mm² | Re N/mm² | A5% | Z% | KCU kJ/m² | |---|---|---|---|---|---| | Steel | 590 – 690 | 325 | 28 | 50 | 270 | By delivery state**no delivery state stated** source `splav` | Delivery state | HB | |---|---| | (annealing) , GOST 1435-99 | 217 | 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 | 7.83 | 209 | — | — | — | — | | 100 | 7.809 | 205 | 10.5 | 45 | 469 | 252 | | 200 | 7.781 | 200 | 11.8 | 43 | 503 | 333 | | 300 | 7.749 | 193 | 12.6 | 40 | 519 | 430 | | 400 | 7.713 | 185 | 13.4 | 37 | 536 | 540 | | 500 | 7.675 | 178 | 13.1 | 35 | 553 | 665 | | 600 | 7.634 | 166 | 14.8 | 32 | 720 | 802 | | 700 | 7.592 | — | 15.3 | 28 | 611 | 964 | | 800 | 7.565 | — | 15 | 24 | 712 | 1152 | | 900 | 7.489 | — | 16.3 | 25 | 703 | 1196 | | 1000 | — | — | 16.8 | — | 699 | — | 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")[C80U 1.1525 Mn 0,10-0,40 · Si 0,10-0,30 - ΔMn 0.00 - ΔSi 0.00 - 44 designations](/materials/din-en/c80u "C80U")[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")[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=80aa5f56-8757-4ec4-8492-1332d8283b1d&designation=9d4feaed-6ccd-4394-844d-c8d35296829d "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/pn/n12e.pdf "Datasheet as PDF")