BM34
BM34 is a designation in BS for the material held under material number 1.3249, also listed as HS2-9-2-8. It is a material in the category High-speed steels. We list 9 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS and UNE.
If you came for one of these
The most-used names for this grade.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.
Also known as
9 designations · 5 standards · nothing hidden- BM34Indicative
Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.
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 |
|---|---|
0.85–0.92 | |
≤ 0.45 | |
≤ 0.4 | |
0.03 | |
0.03 | |
3.5–4.2 | |
8–9.2 | |
1.8–2.2 | |
1.5–2 | |
7.75–8.75 |
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 | 0,85-0,92 | 0.850 | 0.920 | Range |
| Si | ≤0,45 | — | 0.450 | Max |
| P | 0,03 | 0.030 | 0.030 | Exact |
| S | 0,03 | 0.030 | 0.030 | Exact |
| V | 1,80-2,20 | 1.800 | 2.200 | Range |
| Cr | 3,50-4,20 | 3.500 | 4.200 | Range |
| Mn | ≤0,40 | — | 0.400 | Max |
| Co | 7,75-8,75 | 7.750 | 8.750 | Range |
| Mo | 8,00-9,20 | 8.000 | 9.200 | Range |
| W | 1,50-2,00 | 1.500 | 2.000 | 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 1.3, a shared category, and a published range for Mo / Co 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.