--- title: "D65 — C66D, 32 equivalent designations" description: "D65 in PN: material number 1.0612, also listed as C66D. It is a material in the category Others. Designations recorded for this grade: 32." canonical: https://steelequivalents.com/materials/pn/d65 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/pn/d65.md cs: https://steelequivalents.com/cs/materiály/pn/d65.md de: https://steelequivalents.com/de/werkstoffe/pn/d65.md es: https://steelequivalents.com/es/materiales/pn/d65.md fr: https://steelequivalents.com/fr/matériaux/pn/d65.md hu: https://steelequivalents.com/hu/anyagok/pn/d65.md it: https://steelequivalents.com/it/materiali/pn/d65.md nl: https://steelequivalents.com/nl/materialen/pn/d65.md pl: https://steelequivalents.com/pl/materiały/pn/d65.md pt: https://steelequivalents.com/pt/materiais/pn/d65.md ru: https://steelequivalents.com/ru/материалы/pn/d65.md tr: https://steelequivalents.com/tr/malzemeler/pn/d65.md zh: https://steelequivalents.com/zh/材料/pn/d65.md ja: https://steelequivalents.com/ja/材料/pn/d65.md ar: https://steelequivalents.com/ar/المواد/pn/d65.md ko: https://steelequivalents.com/ko/재료/pn/d65.md pt-br: https://steelequivalents.com/pt-br/materiais/pn/d65.md hi: https://steelequivalents.com/hi/सामग्री/pn/d65.md content_hash: sha256:edf2b2f09ecec380ca227f2d3a6cd939036125e93e5e14b6cdc8cabb3f39b112 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/pn/d65 > Canonical URL: https://steelequivalents.com/materials/pn/d65 > 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 · 32 designations # D65 D65 is a designation in PN for the material held under material number 1.0612, also listed as C66D. It is a material in the category Others. We list 32 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, JIS, GB, GOST, UNI, ČSN, PN, STAS and BDS. - [*Material no.* **1.0612**](/materials/material-no/1.0612 "Material no.: 1.0612") - [*Category* **Others · 1754 grades**](/categories/others "Category: Others · 1754 grades") - *Designations* **32** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=f16641ef-dfce-4f3a-b591-b7e0e180b1e0&designation=47963a9c-8d76-41d9-a197-62bf943d4c2b "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/pn/d65.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN C66D This grade’s own name](/materials/din-en/c66d "DIN / EN C66D") - [UNS G10650 This grade’s own name · 4 grades on that route](/materials/uns/g10650 "UNS G10650") - [AISI / SAE 1065 This grade’s own name · 8 grades on that route](/materials/aisi-sae/1065 "AISI / SAE 1065") ## About Others These are miscellaneous metallic alloys that do not fit a more specific material family and may be based on iron, nickel, cobalt, copper or other alloy systems. They are selected for applications requiring particular combinations of strength, hardness, toughness, wear resistance or resistance to demanding service conditions. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 32 designations · 13 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 - [C66D This grade’s own name](/materials/din-en/c66d "DIN / EN C66D") UNS United States · 1 - [G10650 This grade’s own name](/materials/uns/g10650 "UNS G10650") AISI / SAE United States · 8 - [1060 Indicative](/materials/aisi-sae/1060 "AISI / SAE 1060") - [1064 Indicative](/materials/aisi-sae/1064 "AISI / SAE 1064") - [1065 This grade’s own name](/materials/aisi-sae/1065 "AISI / SAE 1065") - [G10640 Indicative](/materials/uns/g10640 "AISI / SAE G10640") - [G10650 Indicative](/materials/uns/g10650 "AISI / SAE G10650") - [G10690 Indicative](/materials/uns/g10690 "AISI / SAE G10690") - [G10700 Indicative](/materials/uns/g10700 "AISI / SAE G10700") - [Gr.1070 Indicative](/materials/aisi-sae/gr-1070 "AISI / SAE Gr.1070") BS United Kingdom · 2 - [060A67 Indicative](/materials/bs/060a67 "BS 060A67") - [080A67 Indicative](/materials/bs/080a67 "BS 080A67") AFNOR France · 3 - [C68 Indicative](/materials/afnor/c68 "AFNOR C68") - [FMR66 Indicative](/materials/afnor/fmr66 "AFNOR FMR66") - [FMR68 Indicative](/materials/afnor/fmr68 "AFNOR FMR68") JIS Japan · 2 - [S58C Indicative](/materials/jis/s58c "JIS S58C") - [SUP2 Indicative](/materials/jis/sup2 "JIS SUP2") GB China · 1 - [65 Indicative](/materials/gb/65 "GB 65") GOST Russia / CIS · 7 - [65 Indicative](/materials/gb/65 "GOST 65") - [65G Indicative](/materials/gost/65g "GOST 65G") - [85KH4M5F2V6L Indicative](/materials/gost/85kh4m5f2v6l "GOST 85KH4M5F2V6L") - [85Х4М5Ф2В6Л Indicative](/materials/gost/85kh4m5f2v6l "GOST 85Х4М5Ф2В6Л") - [CHYU6S5 Indicative](/materials/gost/chyu6s5 "GOST CHYU6S5") - [R6AM5 Indicative](/materials/gost/r6am5 "GOST R6AM5") - [Р6М5Л Indicative](/materials/gost/r6m5l "GOST Р6М5Л") UNI Italy · 2 - [3CD65 Indicative](/materials/uni/3cd65 "UNI 3CD65") - [C67 Indicative](/materials/din-en/c67 "UNI C67") ČSN Czechia · 1 - [12071 Indicative](/materials/csn/12071 "ČSN 12071") PN Poland · 2 - [65 Indicative](/materials/gb/65 "PN 65") - **D65 Indicative** STAS Romania · 1 - [OLC65A Indicative](/materials/stas/olc65a "STAS OLC65A") BDS Bulgaria · 1 - [65 Indicative](/materials/gb/65 "BDS 65") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 10 elements on file · weight % What this alloy is Fe C Mn Cu Iron — the balance, never listed by a standard — 97.8 % C — 0.7 % Mn — 0.7 % Cu — 0.3 % Traces & impurities · 0.7 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.63–0.68 | | Si | 0.1–0.3 | | Mn | 0.5–0.8 | | P | 0.03 | | S | 0.03 | | Cr | ≤ 0.15 | | Mo | ≤ 0.05 | | Ni | ≤ 0.2 | | Cu | ≤ 0.25 | | Al | ≤ 0.01 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Copper 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 | 0,63-0,68 | 0.630 | 0.680 | Range | | Al | ≤0,01 | — | 0.010 | Max | | 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 | | Cr | ≤0,15 | — | 0.150 | Max | | Mn | 0,50-0,80 | 0.500 | 0.800 | Range | | Ni | ≤0,20 | — | 0.200 | Max | | Cu | ≤0,25 | — | 0.250 | Max | | Mo | ≤0,05 | — | 0.050 | 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 Transformation point Ac1 727 °C Exact Transformation point Ac3 752 °C Exact · Ac3(Acm) Transformation point Ar3 730 °C Exact · Ar3(Arcm) Transformation point Ar1 696 °C Exact Weldability not suitable for welding As published: is not used. 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 3 conditions · 27 values By delivery state**no delivery state stated** source `splav` | Delivery state | Rm N/mm² | A5% | HB | |---|---|---|---| | Band annealed , GOST 2284-79 | 440 – 740 | 10 | — | | Band cold-worked , GOST 2284-79 | 740 – 1130 | — | — | | (without heat treatment) , GOST 14959 | — | — | 255 | | Sheet trick GOST 1577-93 | — | — | 229 | By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Rm N/mm² | Re N/mm² | A5% | Z% | |---|---|---|---|---| | Rolled stock, GOST 14959-79 | 980 | 785 | 10 | 35 | 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) | |---|---|---|---|---|---| | 20 | 7.81 | 205 | — | — | — | | 100 | — | — | 11 | 68 | 483 | | 200 | — | — | 11.6 | 53 | — | | 300 | — | — | 12.3 | — | — | | 400 | — | — | 13.2 | 36 | 525 | | 500 | — | — | 13.8 | 31 | — | | 600 | — | — | 14.2 | — | — | | 700 | — | — | 14.6 | — | — | | 800 | — | — | 14.7 | — | — | | 900 | — | — | 13.9 | — | — | | 1000 | — | — | 14.8 | — | — | 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 1.0, 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. [C38D 1.0516 Mn 0,50-0,80 · Si 0,10-0,30 - ΔMn 0.00 - ΔSi 0.00 - 3 designations](/materials/din-en/c38d "C38D")[C48D 1.0517 Mn 0,50-0,80 · Si 0,10-0,30 - ΔMn 0.00 - ΔSi 0.00 - 1 designations](/materials/din-en/c48d "C48D")[C56 D 1.0518 Mn 0,50-0,80 · Si 0,10-0,30 - ΔMn 0.00 - ΔSi 0.00 - 1 designations](/materials/din-en/c56-d "C56 D")[C32D 1.0530 Mn 0,50-0,80 · Si 0,10-0,30 - ΔMn 0.00 - ΔSi 0.00 - 10 designations](/materials/din-en/c32d "C32D")[C52D 1.0588 Mn 0,50-0,80 · Si 0,10-0,30 - ΔMn 0.00 - ΔSi 0.00 - 1 designations](/materials/din-en/c52d "C52D")[C62D 1.0611 Mn 0,50-0,80 · Si 0,10-0,30 - ΔMn 0.00 - ΔSi 0.00 - 3 designations](/materials/din-en/c62d "C62D") ## 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=f16641ef-dfce-4f3a-b591-b7e0e180b1e0&designation=47963a9c-8d76-41d9-a197-62bf943d4c2b "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/pn/d65.pdf "Datasheet as PDF")