55Cr3
55Cr3 is a material in the category Spring steels, held under material number 1.7176. We list 47 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, JIS, GB, GOST, UNI, SS, ČSN, PN, SRPS, COPANT, AS / NZS, BDS, NBN and KS. Its recorded composition includes C 0.52–0.59%, Si ≤ 0.4%, P 0.025%, Cr 0.7–1% and Mn 0.7–1%. Recorded mechanical properties include Rm 1270 N/mm², Re 1175 N/mm², A5 7%, HB 230–302 and Z 35%; these figures vary with the delivery condition and dimension. Its recorded density is 7.45 g/cm³. Recorded transformation points: Ac1 750 °C and Ac3 775 °C. It is recorded as not intended for welding.
- Material no. 1.7176
- Category Spring steels · 52 grades
- Designations 47
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
47 designations · 19 standards · nothing hidden- 1.7176Indicative
- 55Cr3This grade’s own name
- 55Cr3Indicative
- F.1431Indicative
- 55Cr3Indicative
- 55Cr3Indicative
Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.
Chemical composition
6 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 |
|---|---|
0.52–0.59 | |
≤ 0.4 | |
0.7–1 | |
0.025 | |
0.025 | |
0.7–1 |
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 | 0,52-0,59 | 0.520 | 0.590 | Range |
| Si | ≤0,40 | — | 0.400 | Max |
| P | 0,025 | 0.025 | 0.025 | Exact |
| S | 0,025 | 0.025 | 0.025 | Exact |
| Cr | 0,70-1,00 | 0.700 | 1.000 | Range |
| Mn | 0,70-1,00 | 0.700 | 1.000 | Range |
- Cu+10Sn±0,60
- Cu+10Sn±0,60
- Cu+10Sn±0,60
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, 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.
Properties by condition
5 conditions · 9 valuessplav| Delivery state | HB |
|---|---|
| (annealing) , GOST 14959-79 | 269 |
| (without heat treatment) , GOST 14959 | 302 |
steelnumber| Delivery state | HB |
|---|---|
| Treated to improve shearability | 280 |
splav| Heat-treated condition | RmN/mm² | ReN/mm² | A5% | Z% |
|---|---|---|---|---|
| Rolled stock, GOST 14959-79 | 1270 | 1175 | 7 | 35 |
steelnumber| Delivery state | HB |
|---|---|
| Soft annealed | 248 |
steelnumber| Delivery state | HB |
|---|---|
| Annealed to achieve spheroidization of the carbides | 230 |
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.
Similar grades — and why
Selection rule, stated so you can disagree with it: same number class 1.7, a shared category, and a published range for Cr / Mn 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.