--- title: "K23510 — Nitriding steels" description: "K23510 in UNS: material number 1.8507, also listed as 34CrAlMo5-10. Category: Nitriding steels. Designations recorded for this grade: 14." canonical: https://steelequivalents.com/materials/uns/k23510 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/uns/k23510.md cs: https://steelequivalents.com/cs/materiály/uns/k23510.md de: https://steelequivalents.com/de/werkstoffe/uns/k23510.md es: https://steelequivalents.com/es/materiales/uns/k23510.md fr: https://steelequivalents.com/fr/matériaux/uns/k23510.md hu: https://steelequivalents.com/hu/anyagok/uns/k23510.md it: https://steelequivalents.com/it/materiali/uns/k23510.md nl: https://steelequivalents.com/nl/materialen/uns/k23510.md pl: https://steelequivalents.com/pl/materiały/uns/k23510.md pt: https://steelequivalents.com/pt/materiais/uns/k23510.md ru: https://steelequivalents.com/ru/материалы/uns/k23510.md tr: https://steelequivalents.com/tr/malzemeler/uns/k23510.md zh: https://steelequivalents.com/zh/材料/uns/k23510.md ja: https://steelequivalents.com/ja/材料/uns/k23510.md ar: https://steelequivalents.com/ar/المواد/uns/k23510.md ko: https://steelequivalents.com/ko/재료/uns/k23510.md pt-br: https://steelequivalents.com/pt-br/materiais/uns/k23510.md hi: https://steelequivalents.com/hi/सामग्री/uns/k23510.md content_hash: sha256:eeaf368848303fe61b30f037920eda3efe74d4bbd869797636b9b66f5689bf8d 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/uns/k23510 > Canonical URL: https://steelequivalents.com/materials/uns/k23510 > 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. UNS · United States · 14 designations # K23510 K23510 is a designation in UNS for the material held under material number 1.8507, also listed as 34CrAlMo5-10. It is a material in the category Nitriding steels. We list 14 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, GOST, PN and SRPS. - [*Material no.* **1.8507**](/materials/material-no/1.8507 "Material no.: 1.8507") - [*Category* **Nitriding steels · 11 grades**](/categories/nitriding-steels "Category: Nitriding steels · 11 grades") - *Designations* **14** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=5152c23c-d784-4e9f-9db0-3147b1c775c3&designation=55b19fea-f487-4d73-92ba-615b59e2f2dc "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uns/k23510.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 34CrAlMo5-10 This grade’s own name](/materials/din-en/34cralmo5-10 "DIN / EN 34CrAlMo5-10") ## About Nitriding steels Nitriding steels are alloy steels designed for nitriding, a surface-hardening treatment that produces a hard, wear-resistant surface while retaining a tough supporting core. They are used for gears, shafts, dies and other components requiring resistance to wear, repeated loading and dimensional change in service. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 14 designations · 9 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 - [34CrAlMo5 This grade’s own name Withdrawn](/materials/din-en/34cralmo5 "DIN / EN 34CrAlMo5") - [34CrAlMo5-10 This grade’s own name](/materials/din-en/34cralmo5-10 "DIN / EN 34CrAlMo5-10") UNS United States · 1 - **K23510 This grade’s own name** AISI / SAE United States · 1 - [A355CI.D Indicative](/materials/aisi-sae/a355ci-d "AISI / SAE A355CI.D") BS United Kingdom · 3 - [905M31 Indicative](/materials/bs/905m31 "BS 905M31") - [905M39 Indicative](/materials/bs/905m39 "BS 905M39") - [EN41B Indicative](/materials/bs/en41b "BS EN41B") AFNOR France · 2 - [30CAD6.12 Indicative](/materials/afnor/30cad6-12 "AFNOR 30CAD6.12") - [40CAD612 Indicative](/materials/afnor/40cad612 "AFNOR 40CAD612") UNE Spain · 2 - [-34CrAIMo5 Indicative](/materials/une/34craimo5 "UNE -34CrAIMo5") - [F.1741 Indicative](/materials/une/f-1741 "UNE F.1741") GOST Russia / CIS · 1 - [38Х2МЮА Indicative](/materials/gost/38kh2myua "GOST 38Х2МЮА") PN Poland · 1 - [38HMJ Indicative](/materials/pn/38hmj "PN 38HMJ") SRPS Serbia · 1 - [Č.4739 Indicative](/materials/srps/c-4739 "SRPS Č.4739") 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 Cr Al Mn Iron — the balance, never listed by a standard — 96.3 % Cr — 1.2 % Al — 1 % Mn — 0.6 % Traces & impurities · 1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.3–0.37 | | Si | ≤ 0.4 | | Mn | 0.4–0.7 | | P | 0.025 | | S | 0.035 | | Cr | 1–1.3 | | Mo | 0.15–0.25 | | Al | 0.8–1.2 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Aluminium 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 | 0,30-0,37 | 0.300 | 0.370 | Range | | Al | 0,80-1,20 | 0.800 | 1.200 | Range | | Si | ≤0,40 | — | 0.400 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,035 | 0.035 | 0.035 | Exact | | Cr | 1,00-1,30 | 1.000 | 1.300 | Range | | Mn | 0,40-0,70 | 0.400 | 0.700 | Range | | Mo | 0,15-0,25 | 0.150 | 0.250 | 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. ## 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 2 conditions · 5 values By thickness**Quenched and tempered** source `steelnumber` | Thickness mm | Rm N/mm² | A% | |---|---|---| | 16 – 40 | 800 – 1000 | 14 | | 40 – 100 | 800 – 1000 | 14 | By delivery state**Soft annealed** source `steelnumber` | Delivery state | HB | |---|---| | Soft annealed | 248 | 1 further values are held for this grade under a condition the source did not name — a bound with no quantity attached. They are withheld rather than shown against a guessed condition. 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. ## Heat treatment Supply condition - Nitriding - Soft annealing Bar, Rod, Flat product, Forging and Semi-finished product - Quenching and Tempering Bar, Flat product and Forging 16≤d≤40 - Quenching and Tempering 16≤d≤100 8≤t≤60 Conditions the standard permits on delivery. No temperature or medium is published for these, so no order and no alternation is implied. Source: [www.caishuku.com](https://www.caishuku.com/detail/azhlNWIxMTMzNzk_ "Source: www.caishuku.com") ## Similar grades — and why Selection rule, stated so you can disagree with it: same number class 1.8, a shared category, and a published range for Cr / Al 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. [34CrAlS5 1.8506 Cr 1,00-1,30 · Al 0,80-1,20 - ΔCr 0.00 - ΔAl 0.00 - 2 designations](/materials/din-en/34crals5 "34CrAlS5")[34CrAl6 1.8504 Cr 1,20-1,50 · Al 0,80-1,10 - ΔCr 0.20 - ΔAl 0.05 - 2 designations](/materials/din-en/34cral6 "34CrAl6") ## 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=5152c23c-d784-4e9f-9db0-3147b1c775c3&designation=55b19fea-f487-4d73-92ba-615b59e2f2dc "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uns/k23510.pdf "Datasheet as PDF")