--- title: "ЭИ680 — Stainless steels" description: "ЭИ680 in GOST: material number 1.4580, also listed as X6CrNiMoNb17-12-2. Category: Stainless steels. Designations recorded for this grade: 16." canonical: https://steelequivalents.com/materials/gost/ei680 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/gost/ei680.md cs: https://steelequivalents.com/cs/materiály/gost/ei680.md de: https://steelequivalents.com/de/werkstoffe/gost/ei680.md es: https://steelequivalents.com/es/materiales/gost/ei680.md fr: https://steelequivalents.com/fr/matériaux/gost/ei680.md hu: https://steelequivalents.com/hu/anyagok/gost/ei680.md it: https://steelequivalents.com/it/materiali/gost/ei680.md nl: https://steelequivalents.com/nl/materialen/gost/ei680.md pl: https://steelequivalents.com/pl/materiały/gost/ei680.md pt: https://steelequivalents.com/pt/materiais/gost/ei680.md ru: https://steelequivalents.com/ru/материалы/gost/эи680.md tr: https://steelequivalents.com/tr/malzemeler/gost/ei680.md zh: https://steelequivalents.com/zh/材料/gost/ei680.md ja: https://steelequivalents.com/ja/材料/gost/ei680.md ar: https://steelequivalents.com/ar/المواد/gost/ei680.md ko: https://steelequivalents.com/ko/재료/gost/ei680.md pt-br: https://steelequivalents.com/pt-br/materiais/gost/ei680.md hi: https://steelequivalents.com/hi/सामग्री/gost/ei680.md content_hash: sha256:6daafa33a2d889e0dc1b7d9906ec644ea1258e28169e3ff16a3ddd31484c6135 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/gost/ei680 > Canonical URL: https://steelequivalents.com/materials/gost/ei680 > 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. GOST · Russia / CIS · 16 designations # ЭИ680 ЭИ680 is a designation in GOST for the material held under material number 1.4580, also listed as X6CrNiMoNb17-12-2. It is a material in the category Stainless steels. We list 16 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, GB, GOST and SRPS. - [*Material no.* **1.4580**](/materials/material-no/1.4580 "Material no.: 1.4580") - [*Category* **Stainless steels · 468 grades**](/categories/stainless-steels "Category: Stainless steels · 468 grades") - *Designations* **16** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=bd61673a-96e8-49f6-a293-d353eef51827&designation=fa7a3ad8-d622-4015-968f-1eb460305892 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/ei680.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN X6CrNiMoNb17-12-2 This grade’s own name · 2 grades on that route](/materials/din-en/x6crnimonb17-12-2 "DIN / EN X6CrNiMoNb17-12-2") - [UNS J92971 This grade’s own name](/materials/uns/j92971 "UNS J92971") - [AISI / SAE 316Cb This grade’s own name · 3 grades on that route](/materials/aisi-sae/316cb "AISI / SAE 316Cb") ## About Stainless steels Stainless steels are corrosion-resistant alloy steels whose chromium content promotes a protective passive surface film. They are used for equipment, structures and components exposed to moisture, chemicals or hygienic service, with different alloy compositions selected for corrosion resistance, strength, formability or weldability. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 16 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 · 1 - [X6CrNiMoNb17-12-2 This grade’s own name](/materials/din-en/x6crnimonb17-12-2 "DIN / EN X6CrNiMoNb17-12-2") UNS United States · 2 - [J92971 This grade’s own name](/materials/uns/j92971 "UNS J92971") - [S31640 This grade’s own name](/materials/uns/s31640 "UNS S31640") AISI / SAE United States · 2 - [316Cb This grade’s own name](/materials/aisi-sae/316cb "AISI / SAE 316Cb") - [S31640 Indicative](/materials/uns/s31640 "AISI / SAE S31640") BS United Kingdom · 1 - [318 S 17 Indicative](/materials/bs/318-s-17 "BS 318 S 17") AFNOR France · 2 - [Z6CNDNb17-12 Indicative](/materials/afnor/z6cndnb17-12 "AFNOR Z6CNDNb17-12") - [Z6CNDNb18-12 Indicative](/materials/afnor/z6cndnb18-12 "AFNOR Z6CNDNb18-12") UNE Spain · 1 - [F.3536 Indicative](/materials/une/f-3536 "UNE F.3536") GB China · 1 - [06Cr17Ni12Mo2Nb Indicative](/materials/gb/06cr17ni12mo2nb "GB 06Cr17Ni12Mo2Nb") GOST Russia / CIS · 5 - [08Ch16N13M2B Indicative](/materials/gost/08ch16n13m2b "GOST 08Ch16N13M2B") - [08KH16N13M2B Indicative](/materials/gost/08kh16n13m2b "GOST 08KH16N13M2B") - [08Х16Н13М2Б Indicative](/materials/gost/08kh16n13m2b "GOST 08Х16Н13М2Б") - [1Х16Н13М2Б Indicative](/materials/gost/1kh16n13m2b "GOST 1Х16Н13М2Б") - **ЭИ680 Indicative** SRPS Serbia · 1 - [Č.4583 Indicative](/materials/srps/c-4583 "SRPS Č.4583") 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 Ni Mo Iron — the balance, never listed by a standard — 65.1 % Cr — 17.5 % Ni — 12 % Mo — 2.3 % Traces & impurities · 3.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.08 | | Si | ≤ 1 | | Mn | ≤ 2 | | P | 0.045 | | S | 0.015 | | Cr | 16.5–18.5 | | Mo | 2–2.5 | | Ni | 10.5–13.5 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel 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 | ≤0,08 | — | 0.080 | Max | | Si | ≤1,00 | — | 1.000 | Max | | P | 0,045 | 0.045 | 0.045 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Cr | 16,5-18,5 | 16.500 | 18.500 | Range | | Mn | ≤2,00 | — | 2.000 | Max | | Ni | 10,5-13,5 | 10.500 | 13.500 | Range | | Mo | 2,00-2,50 | 2.000 | 2.500 | Range | - (10xC)≤1,00 - (10xC)≤1,00 - (10xC)≤1,00 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 7,95 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 5 conditions · 31 values By delivery state**Soft annealed** source `steelnumber` | Delivery state | HB | |---|---| | Soft annealed | 230 | By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Rm N/mm² | Re N/mm² | A5% | KCU kJ/m² | |---|---|---|---|---| | Sheet | 550 | 230 | 25 | 800 | By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Rm N/mm² | Re N/mm² | A5% | Z% | KCU kJ/m² | |---|---|---|---|---|---| | Bar, GOST 5949-75 | 550 | 215 | 40 | 50 | 1180 | By delivery state**no delivery state stated** source `splav` | Delivery state | HB | |---|---| | 08KH16N13M2B ( 08Х16Н13М2Б ) (annealing) , Bar GOST 5949-75 | 143 – 179 | 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) | |---|---|---|---|---| | 20 | 7.96 | 206 | — | — | | 100 | — | 200 | — | 15.2 | | 200 | — | 191 | — | 17.1 | | 300 | — | 183 | — | 18.4 | | 400 | — | 174 | 17.1 | 20.1 | | 500 | — | 167 | 17.4 | 21.7 | | 600 | — | 158 | 17.8 | 23 | | 700 | — | — | 18.2 | 24.7 | | 800 | — | — | 18.6 | — | 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 1.4, a shared category, and a published range for Cr / Ni 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. [1.4571 1.4571 Cr 16,5-18,5 · Ni 10,5-13,5 - ΔCr 0.00 - ΔNi 0.00 - 72 designations](/materials/material-no/1.4571 "1.4571")[X3CrNiMo18-12-3 1.4449 Cr 17,0-18,2 · Ni 11,5-12,5 - ΔCr 0.10 - ΔNi 0.00 - 35 designations](/materials/din-en/x3crnimo18-12-3 "X3CrNiMo18-12-3")[1.4436 1.4436 Cr 16,5-18,5 · Ni 10,5-13,0 - ΔCr 0.00 - ΔNi 0.25 - 118 designations](/materials/material-no/1.4436 "1.4436")[X4CrNi18-12 1.4303 Cr 17,0-19,0 · Ni 11,0-13,0 - ΔCr 0.50 - ΔNi 0.00 - 84 designations](/materials/din-en/x4crni18-12 "X4CrNi18-12")[1.4401 1.4401 Cr 16,5-18,5 · Ni 10,0-13,0 - ΔCr 0.00 - ΔNi 0.50 - 134 designations](/materials/material-no/1.4401 "1.4401")[1.4429 1.4429 Cr 16,5-18,5 · Ni 11,0-14,0 - ΔCr 0.00 - ΔNi 0.50 - 62 designations](/materials/material-no/1.4429 "1.4429") ## 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=bd61673a-96e8-49f6-a293-d353eef51827&designation=fa7a3ad8-d622-4015-968f-1eb460305892 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/ei680.pdf "Datasheet as PDF")