C70G
C70G is a material in the category Steels for surface hardening, held under material number 1.1249. Its recorded composition includes C 0.68–0.75%, Si 0.15–0.35%, P 0.025%, S 0.035% and Mn 0.2–0.35%. We list 3 designations recorded for this grade, in the standards DIN / EN, AISI / SAE and ČSN. Its recorded density is 7.66 g/cm³.
About Steels for surface hardening
Steels for surface hardening are steels designed to develop a hard, wear-resistant surface while retaining a tougher interior. They are used for gears, shafts and other machine parts where resistance to surface wear is needed together with resistance to impact and bending.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Also known as
4 designations · 3 standards · nothing hidden- C70GThis grade’s own nameWithdrawn
- Cf 70This grade’s own nameWithdrawn
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 |
|---|---|
0.68–0.75 | |
0.15–0.35 | |
0.2–0.35 | |
0.025 | |
0.035 |
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 | 0,68-0,75 | 0.680 | 0.750 | Range |
| Si | 0,15-0,35 | 0.150 | 0.350 | Range |
| P | 0,025 | 0.025 | 0.025 | Exact |
| S | 0,035 | 0.035 | 0.035 | Exact |
| Mn | 0,20-0,35 | 0.200 | 0.350 | 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.
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.