C75
C75 is a material in the category Spring steels, held under material number 1.0605. We list 13 designations recorded for this grade, in the standards UNS, AISI / SAE, BS, AFNOR, JIS, GOST, ČSN, PN, SRPS, STN and STAS. Its recorded composition includes C 0.7–0.8%, Si 0.15–0.35%, P 0.045%, S 0.045% and Mn 0.6–0.8%. Its recorded density is 7.85 g/cm³.
- Material no. 1.0605
- Category Spring steels · 52 grades
- Designations 14
If you came for one of these
The most-used names for this grade.About Spring steels
Spring steels are alloy steels designed to store and release elastic energy repeatedly without permanent deformation. They are characterised by a combination of strength, hardness and resilience, making them suitable for springs, clips, washers and other components subjected to repeated flexing or shock.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Also known as
14 designations · 12 standards · nothing hidden- C75This 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 |
|---|---|
0.7–0.8 | |
0.15–0.35 | |
0.6–0.8 | |
0.045 | |
0.045 |
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 | 0,70-0,80 | 0.700 | 0.800 | Range |
| Si | 0,15-0,35 | 0.150 | 0.350 | Range |
| P | 0,045 | 0.045 | 0.045 | Exact |
| S | 0,045 | 0.045 | 0.045 | Exact |
| Mn | 0,60-0,80 | 0.600 | 0.800 | 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.
Similar grades — and why
Selection rule, stated so you can disagree with it: same number class 1.0, a shared category, and a published range for Mn / Si 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.