--- title: "687 — Nickel and cobalt alloys" description: "687 in AISI / SAE: material number 2.4636, also listed as NiCo15Cr15MoAlTi. Category: Nickel and cobalt alloys. Designations recorded for this grade: 3." canonical: https://steelequivalents.com/materials/aisi-sae/687 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/aisi-sae/687.md cs: https://steelequivalents.com/cs/materiály/aisi-sae/687.md de: https://steelequivalents.com/de/werkstoffe/aisi-sae/687.md es: https://steelequivalents.com/es/materiales/aisi-sae/687.md fr: https://steelequivalents.com/fr/matériaux/aisi-sae/687.md hu: https://steelequivalents.com/hu/anyagok/aisi-sae/687.md it: https://steelequivalents.com/it/materiali/aisi-sae/687.md nl: https://steelequivalents.com/nl/materialen/aisi-sae/687.md pl: https://steelequivalents.com/pl/materiały/aisi-sae/687.md pt: https://steelequivalents.com/pt/materiais/aisi-sae/687.md ru: https://steelequivalents.com/ru/материалы/aisi-sae/687.md tr: https://steelequivalents.com/tr/malzemeler/aisi-sae/687.md zh: https://steelequivalents.com/zh/材料/aisi-sae/687.md ja: https://steelequivalents.com/ja/材料/aisi-sae/687.md ar: https://steelequivalents.com/ar/المواد/aisi-sae/687.md ko: https://steelequivalents.com/ko/재료/aisi-sae/687.md pt-br: https://steelequivalents.com/pt-br/materiais/aisi-sae/687.md hi: https://steelequivalents.com/hi/सामग्री/aisi-sae/687.md content_hash: sha256:37a522e5dc075f5745603b75707376e24655cedddce345c7d39423d44bd1fdfa 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/aisi-sae/687 > Canonical URL: https://steelequivalents.com/materials/aisi-sae/687 > 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 · 3 designations # 687 687 is a designation in AISI / SAE for the material held under material number 2.4636, also listed as NiCo15Cr15MoAlTi. It is a material in the category Nickel and cobalt alloys. We list 3 designations recorded for this grade, in the standards DIN / EN, AISI / SAE and AFNOR. - [*Material no.* **2.4636**](/materials/material-no/2.4636 "Material no.: 2.4636") - [*Category* **Nickel and cobalt alloys · 87 grades**](/categories/nickel-and-cobalt-alloys "Category: Nickel and cobalt alloys · 87 grades") - *Designations* **3** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=b96b3cbc-6baa-41c8-ba2a-abe2a863496b&designation=0d801cd1-365f-4192-ad4c-6a47d1141a08 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/aisi-sae/687.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN NiCo15Cr15MoAlTi This grade’s own name](/materials/din-en/nico15cr15moalti "DIN / EN NiCo15Cr15MoAlTi") ## About Nickel and cobalt alloys Nickel and cobalt alloys are metallic materials whose properties are developed through nickel-, cobalt-, or combined alloying systems. They are characterised by strong resistance to corrosion, oxidation, wear, and loss of strength at elevated temperatures, making them suitable for turbine components, chemical-processing equipment, and other demanding high-temperature applications. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 3 designations · 3 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 - [NiCo15Cr15MoAlTi This grade’s own name](/materials/din-en/nico15cr15moalti "DIN / EN NiCo15Cr15MoAlTi") AISI / SAE United States · 1 - **687 Indicative** AFNOR France · 1 - [NCKD 20 AT Indicative](/materials/afnor/nckd-20-at "AFNOR NCKD 20 AT") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 15 elements on file · weight % What this alloy is Fe Cr Co Al Iron — the balance, never listed by a standard — 54.3 % Cr — 15 % Co — 15 % Al — 5 % Traces & impurities · 10.7 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.12–0.2 | | Si | ≤ 1 | | Mn | ≤ 1 | | P | 0.045 — Unusual | | S | 0.03 | | Cr | 14–16 | | Mo | 3–5 | | Ni | Balance | | Co | 13–17 | | Cu | ≤ 0.2 | | Al | 4.5–5.5 | | Ti | 3.5–4.5 — Unusual | | B | 0.01–0.025 — Unusual | | Zr | ≤ 0.25 | | Fe | ≤ 1 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Cobalt Copper Aluminium Titanium Boron Zirconium Iron 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 | |---|---|---|---|---| | B | 0,01-0,025 | 0.010 | 0.025 | Range | | C | 0,12-0,20 | 0.120 | 0.200 | Range | | Al | 4,50-5,50 | 4.500 | 5.500 | Range | | Si | ≤1,00 | — | 1.000 | Max | | P | 0,045 | 0.045 | 0.045 | Exact | | S | 0,03 | 0.030 | 0.030 | Exact | | Ti | 3,50-4,50 | 3.500 | 4.500 | Range | | Cr | 14,0-16,0 | 14.000 | 16.000 | Range | | Mn | ≤1,00 | — | 1.000 | Max | | Fe | ≤1,00 | — | 1.000 | Max | | Co | 13,0-17,0 | 13.000 | 17.000 | Range | | Ni | Rest/Bal. | 48.250 | 61.795 | Balance | | Cu | ≤0,20 | — | 0.200 | Max | | Zr | ≤0,25 | — | 0.250 | Max | | Mo | 3,00-5,00 | 3.000 | 5.000 | 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. ## Similar grades — and why Selection rule, stated so you can disagree with it: same number class 2.4, a shared category, and a published range for Ni / Cr 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. [NiMo16Cr15W 2.4819 Ni Rest/Bal. · Cr 14,5-16,5 - ΔNi 1.97 - ΔCr 0.50 - 13 designations](/materials/din-en/nimo16cr15w "NiMo16Cr15W")[NiCr6015 2.4867 Ni ≥59,0 · Cr 14,0-19,0 - ΔNi 3.98 - ΔCr 1.50 - 3 designations](/materials/din-en/nicr6015 "NiCr6015")[SG-NiMo16Cr16W 2.4886 Ni ≥50,0 · Cr 14,5-16,5 - ΔNi 5.02 - ΔCr 0.50 - 2 designations](/materials/din-en/sg-nimo16cr16w "SG-NiMo16Cr16W")[NiMo16Cr16Ti 2.4610 Ni Rest/Bal. · Cr 14,0-18,0 - ΔNi 9.79 - ΔCr 1.00 - 9 designations](/materials/din-en/nimo16cr16ti "NiMo16Cr16Ti") ## 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=b96b3cbc-6baa-41c8-ba2a-abe2a863496b&designation=0d801cd1-365f-4192-ad4c-6a47d1141a08 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/aisi-sae/687.pdf "Datasheet as PDF")