SUJ5
SUJ5 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 Ni ≤ 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
9 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 | |
≤ 0.25 | |
≤ 0.2 |
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 |
| Ni | max 0.25 | — | 0.250 | Max |
| Cu | max 0.2 | — | 0.200 | Max |
| 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
This grade's composition falls outside the published model's validated range (a low-alloy composition window), so no transformation temperature is predicted here.
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.
Properties by condition
1 conditions · 1 valuessteeljis| Delivery state | HB |
|---|---|
| Hot rolled | 207 |
Every figure holds only for the condition on its own row. Values are never merged across conditions or across sources, never averaged, and never interpolated between two rows. An em dash means no value on file — never zero. Figures are converted to the unit in the column header; the source’s own wording is kept and shown where the two differ.
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