56Si7
56Si7 is a designation in DIN / EN for the material held under material number 1.5026, also listed as 55Si7. It is a material in the category Spring steels. We list 43 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, Standard not established, BS, AFNOR, UNE, JIS, GB, GOST, UNI, SS, ČSN, PN, COPANT, SRPS, MSZ, STAS, AS / NZS, BDS and NBN.
- Material no. 1.5026
- Category Spring steels · 52 grades
- Designations 43
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
43 designations · 21 standards · nothing hidden- 55Si7This grade’s own nameWithdrawn
- 56Si7This grade’s own name
- 56Si7This grade’s own name
- 55Si7Indicative
- 56Si7Indicative
- F.1440Indicative
Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.
Chemical composition
8 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 |
|---|---|
0.52–0.6 | |
1.6–2 — | |
0.6–0.9 | |
0.025 | |
0.025 | |
≤ 0.4 | |
≤ 0.1 | |
0.4 |
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 | 0,52-0,60 | 0.520 | 0.600 | Range |
| Si | 1,60-2,00 | 1.600 | 2.000 | Range |
| P | 0,025 | 0.025 | 0.025 | Exact |
| S | 0,025 | 0.025 | 0.025 | Exact |
| Cr | ≤0,40 | — | 0.400 | Max |
| Mn | 0,60-0,90 | 0.600 | 0.900 | Range |
| Ni | 0,4 | 0.400 | 0.400 | Exact |
| Mo | ≤0,10 | — | 0.100 | Max |
- 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
computed from composition · °CThese four temperatures are a CALCULATION from this grade's own composition, using the published Li, Niebuhr, Meekisho & Atteridge (1998) model — never a measurement, and computed from the UPPER BOUND of each element's specified range, not a mid-range figure. Where this grade also has a measured transformation point (Ac1, Ac3, Ar1, Ar3) on file, it is shown separately, in Physical & mechanical properties, and is never replaced by the predicted figures here — Ae (predicted, equilibrium) and Ac/Ar (measured, on heating or cooling) are different physical quantities and can differ by tens of degrees; a mismatch between the two is not an error in either.
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
10 conditions · 20 valuessplav| Delivery state | HB |
|---|---|
| (without heat treatment) , GOST 14959 | 285 |
| (heat treatment) , Rolled stock GOST 14959-79 | 241 |
steelnumber| Thicknessmm | RmN/mm² | A80% |
|---|---|---|
| 0.3 – 3 | 740 | 12 |
steelnumber| Thicknessmm | RmN/mm² |
|---|---|
| 0.3 – 3 | 1200 – 1700 |
splav| Heat-treated condition | RmN/mm² | ReN/mm² | A5% | Z% | KCUkJ/m² |
|---|---|---|---|---|---|
| Annealing 750 - 780°C,Cooling oven | 760 | 440 | 21 | 42 | 160 |
splav| Heat-treated condition | RmN/mm² | ReN/mm² | A5% | Z% |
|---|---|---|---|---|
| Rolled stock, GOST 14959-79 | 1270 | 1175 | 6 | 30 |
steelnumber| Delivery state | HB | HV |
|---|---|---|
| Soft annealed | 248 | 230 |
steelnumber| Delivery state | HV |
|---|---|
| Quenched and tempered | 370 – 520 |
steelnumber| Delivery state | HB |
|---|---|
| Treated to improve shearability | 280 |
steelnumber| Delivery state | HB |
|---|---|
| Annealed to achieve spheroidization of the carbides | 230 |
splav| Temperature°C | Elastic modulusGPa |
|---|---|
| 20 | 196 |
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.
Heat treatment
Supply condition
- Quenching and TemperingWire and As-rolled
Conditions the standard permits on delivery. No temperature or medium is published for these, so no order and no alternation is implied.
Source: www.caishuku.com
Similar grades — and why
Selection rule, stated so you can disagree with it: same number class 1.5, a shared category, and a published range for Si / 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.
Si 1,50-1,80 · Mn 0,60-0,80
- ΔSi 0.15
- ΔMn 0.05
- 1 designations
Si 1,50-1,80 · Mn 0,50-0,80
- ΔSi 0.15
- ΔMn 0.10
- 7 designations
Si 1,50-1,80 · Mn 0,50-0,80
- ΔSi 0.15
- ΔMn 0.10
- 11 designations
Si 1,50-1,80 · Mn 0,50-0,80
- ΔSi 0.15
- ΔMn 0.10
- 9 designations
Si 1,50-1,80 · Mn 0,70-1,00
- ΔSi 0.15
- ΔMn 0.10
- 18 designations
Si 1,50-1,80 · Mn 0,70-1,00
- ΔSi 0.15
- ΔMn 0.10
- 17 designations
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.