A 299
A 299 is a material in the category Fine-grain structural steels, held under material number 1.9515. Its recorded composition includes C ≤ 0.28%, Si 0.15–0.4%, P 0.035%, S 0.035% and Mn 0.9–1.4%. We list one designation recorded for this grade, in the standard UNS. Its recorded density is 7.85 g/cm³.
If you came for one of these
The most-used names for this grade.About Fine-grain structural steels
Fine-grain structural steel is a name for structural steels whose properties are particularly suitable for welding. They have a higher yield strength than comparable steels. Due to the negative influence of carbon on the weldability of a material, the maximum carbon content in fine-grained structural steels is less than 0.2%. These properties are achieved in steelmaking by the addition of oxygen and nitrogen-binding elements. The fine grain in the metallurgical structure is achieved by alloying elements whose nitrides and carbides only dissolve at higher temperatures. With the same composition, they are stronger and tougher than coarse-grained steels. Fine-grained structural steels are used above all in reinforced concrete structures such as bridges, in the construction of cranes, hydraulic cylinders or other welded structures due to their special welding suitability and in the offshore area.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Also known as
2 designations · 2 standards · nothing hidden- A 299This grade’s own name
Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.
Chemical composition
5 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 |
|---|---|
≤ 0.28 — | |
0.15–0.4 | |
0.9–1.4 | |
0.035 | |
0.035 — |
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 | ≤0,28 | — | 0.280 | Max |
| Si | 0,15-0,40 | 0.150 | 0.400 | Range |
| P | 0,035 | 0.035 | 0.035 | Exact |
| S | 0,035 | 0.035 | 0.035 | Exact |
| Mn | 0,90-1,40 | 0.900 | 1.400 | 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, 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.
Looking for this grade under another name?
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