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.
If you came for one of these
The most-used names for this grade.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- 687Indicative
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
Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade.
| Element | % by weight |
|---|---|
0.12–0.2 | |
≤ 1 | |
≤ 1 | |
0.045 — | |
0.03 | |
14–16 | |
3–5 | |
Balance | |
13–17 | |
≤ 0.2 | |
4.5–5.5 | |
3.5–4.5 — | |
0.01–0.025 — | |
≤ 0.25 | |
≤ 1 |
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 publishedsource 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
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.
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.