STB5
STB5 is a material in the category Bearing steels. Its recorded composition includes C 0.95–1.1%, Si 0.4–0.7%, Cr 0.9–1.2%, Mn 0.9–1.15% and Mo 0.1–0.25%. No cross-standard equivalents are recorded for this grade yet. Recorded mechanical properties include HB 207.
- Category Bearing steels · 17 grades
- Designations 1
About Bearing steels
Bearing steels are high-carbon steels designed for rolling-element bearings and other components exposed to repeated contact loading. They are characterised by high hardness, wear resistance and resistance to rolling-contact fatigue after suitable heat treatment. They are used for bearing rings, races and rolling elements where reliable operation under cyclic loads is required.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Chemical composition
7 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 |
|---|---|
0.95–1.1 | |
0.4–0.7 | |
0.9–1.15 | |
≤ 0.025 | |
≤ 0.025 | |
0.9–1.2 | |
0.1–0.25 |
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 | 0.95 - 1.1 | 0.950 | 1.100 | Range |
| Si | 0.4 - 0.7 | 0.400 | 0.700 | Range |
| P | max 0.025 | — | 0.025 | Max |
| S | max 0.025 | — | 0.025 | Max |
| Cr | 0.9 - 1.2 | 0.900 | 1.200 | Range |
| Mn | 0.9 - 1.15 | 0.900 | 1.150 | Range |
| Mo | 0.1 - 0.25 | 0.100 | 0.250 | 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.
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.