GH684
GH684 is a designation in GB for the material held under material number 2.4654, also listed as NiCr19Co14Mo4Ti. It is a material in the category Nickel and cobalt alloys. We list 17 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, ISO, SAE AMS and GB.
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
17 designations · 7 standards · nothing hidden- GH4738Indicative
- GH684Indicative
- GH738Indicative
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 |
|---|---|
0.02–0.1 | |
≤ 0.15 | |
≤ 0.1 | |
0.015 | |
0.015 | |
18–21 | |
3.5–5 | |
Balance | |
12–15 | |
≤ 0.1 | |
1.2–1.6 | |
2.8–3.3 | |
0.003–0.01 | |
0.02–0.08 | |
≤ 2 |
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 | 0,003-0,010 | 0.003 | 0.010 | Range |
| C | 0,02-0,10 | 0.020 | 0.100 | Range |
| Al | 1,20-1,60 | 1.200 | 1.600 | Range |
| Si | ≤0,15 | — | 0.150 | Max |
| P | 0,015 | 0.015 | 0.015 | Exact |
| S | 0,015 | 0.015 | 0.015 | Exact |
| Ti | 2,80-3,30 | 2.800 | 3.300 | Range |
| Cr | 18,0-21,0 | 18.000 | 21.000 | Range |
| Mn | ≤0,10 | — | 0.100 | Max |
| Fe | ≤2,00 | — | 2.000 | Max |
| Co | 12,0-15,0 | 12.000 | 15.000 | Range |
| Ni | Rest/Bal. | 51.530 | 62.427 | Balance |
| Cu | ≤0,10 | — | 0.100 | Max |
| Zr | 0,02-0,08 | 0.020 | 0.080 | Range |
| Mo | 3,50-5,00 | 3.500 | 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.
Ni Rest/Bal. · Cr 18,0-21,0
- ΔNi 0.67
- ΔCr 0.00
- 2 designations
Ni Rest/Bal. · Cr 20,0-22,5
- ΔNi 0.49
- ΔCr 1.75
- 19 designations
Ni Rest/Bal. · Cr 18,0-20,0
- ΔNi 4.24
- ΔCr 0.50
- 10 designations
Ni ≥59,0 · Cr 14,0-19,0
- ΔNi 2.02
- ΔCr 3.00
- 3 designations
Ni Rest/Bal. · Cr 20,0-23,0
- ΔNi 3.23
- ΔCr 2.00
- 18 designations
Ni Rest/Bal. · Cr 19,0-21,0
- ΔNi 6.47
- ΔCr 0.50
- 11 designations
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.