G-X8Ni9
G-X8Ni9 is a material in the category Low-temperature structural steels, held under material number 1.5662. We list 15 designations recorded for this grade, in the standards DIN / EN, AISI / SAE, ASTM, BS, AFNOR, UNE and UNI. Its recorded composition includes C ≤ 0.1%, Si ≤ 0.5%, P 0.025%, Mn 0.5–0.7% and Ni 8.5–9.5%. Its recorded density is 7.85 g/cm³.
About Low-temperature structural steels
Low-temperature structural steels are structural steels designed to retain toughness and reliable load-bearing performance in cold service. Their resistance to brittle fracture at low temperatures makes them suitable for structures, pressure-containing equipment and other components exposed to severe cold.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Also known as
16 designations · 7 standards · nothing hidden- 1.5662Indicative
- G-X8Ni9This grade’s own name
- X8Ni9Indicative
- Z8N09Indicative
Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.
Chemical composition
6 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 |
|---|---|
≤ 0.1 | |
≤ 0.5 | |
0.5–0.7 | |
0.025 | |
0.01 | |
8.5–9.5 |
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 |
|---|---|---|---|---|
| C | ≤0,10 | — | 0.100 | Max |
| Si | ≤0,50 | — | 0.500 | Max |
| P | 0,025 | 0.025 | 0.025 | Exact |
| S | 0,01 | 0.010 | 0.010 | Exact |
| Mn | 0,50-0,70 | 0.500 | 0.700 | Range |
| Ni | 8,50-9,50 | 8.500 | 9.500 | 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: Cr, Mo.
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 1.5, a shared category, and a published range for Ni / Mn 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.