S12-1-2-3
S12-1-2-3 is a material in the category High-speed steels, held under material number 1.3211. Its recorded composition includes C 0.77–0.85%, Si ≤ 45%, Cr 3.8–4.5%, Co 2.5–3% and W 11.5–12.5%. No cross-standard equivalents are recorded for this grade yet. Its recorded density is 7.85 g/cm³.
About High-speed steels
High-speed steels are alloyed tool steels designed to retain hardness and cutting ability when tools heat up during high-speed machining. Their hot hardness and wear resistance make them suitable for cutting tools such as drills, milling cutters, taps and broaches.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Chemical composition
10 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 |
|---|---|
0.77–0.85 | |
≤ 45 — | |
≤ 0.4 | |
0.03 | |
0.03 | |
3.8–4.5 | |
0.7–1 | |
1.7–2 | |
11.5–12.5 | |
2.5–3 |
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 | 0,77-0,85 | 0.770 | 0.850 | Range |
| Si | ≤045 | — | 45.000 | Max |
| P | 0,03 | 0.030 | 0.030 | Exact |
| S | 0,03 | 0.030 | 0.030 | Exact |
| V | 1,70-2,00 | 1.700 | 2.000 | Range |
| Cr | 3,80-4,50 | 3.800 | 4.500 | Range |
| Mn | ≤0,40 | — | 0.400 | Max |
| Co | 2,50-3,00 | 2.500 | 3.000 | Range |
| Mo | 0,70-1,00 | 0.700 | 1.000 | Range |
| W | 11,5-12,5 | 11.500 | 12.500 | 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: 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 1.3, a shared category, and a published range for Si / W 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.