S122
S122 is a designation in MSZ for the material held under material number 1.1555, also listed as C120U. It is a material in the category Unalloyed tool steels / carbon steels. We list 31 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, ISO, JIS, GB, GOST, UNI, ČSN, STN, PN, MSZ, BDS and ÖNORM.
If you came for one of these
The most-used names for this grade.About Unalloyed tool steels / carbon steels
Unalloyed tool steels are carbon steels whose working properties are developed primarily through carbon content and heat treatment. They are characterised by high attainable hardness and wear resistance, and are used for cutting tools, punches, dies, gauges and other tooling where edge retention and resistance to deformation are important.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Also known as
31 designations · 17 standards · nothing hidden- S121Indicative
- S122Indicative
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 |
|---|---|
1.15–1.25 | |
0.1–0.3 | |
0.1–0.4 | |
0.03 | |
0.03 |
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 | 1,15-1,25 | 1.150 | 1.250 | Range |
| Si | 0,10-0,30 | 0.100 | 0.300 | Range |
| P | 0,03 | 0.030 | 0.030 | Exact |
| S | 0,03 | 0.030 | 0.030 | Exact |
| Mn | 0,10-0,40 | 0.100 | 0.400 | 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.
Properties by condition
5 conditions · 64 valuessteelnumber| Delivery state | HB |
|---|---|
| Soft annealed | 217 |
splav| Dimensionmm | RmN/mm² | A5% |
|---|---|---|
| 0.08 - 3 | 750 | 10 |
splav| Heat-treated condition | RmN/mm² | ReN/mm² | A5% | Z% | KCUkJ/m² |
|---|---|---|---|---|---|
| Steel | 590 – 690 | 325 | 28 | 50 | 270 |
splav| Delivery state | HB |
|---|---|
| (annealing) , GOST 1435-99 | 217 |
splav| Temperature°C | Densityg/cm³ | Elastic modulusGPa | Thermal expansion coefficient10^-6/K | Thermal conductivityW/(m·K) | Specific heat capacityJ/(kg·K) | Electrical resistivitynΩ·m |
|---|---|---|---|---|---|---|
| 20 | 7.83 | 209 | — | — | — | — |
| 100 | 7.809 | 205 | 10.5 | 45 | 469 | 252 |
| 200 | 7.781 | 200 | 11.8 | 43 | 503 | 333 |
| 300 | 7.749 | 193 | 12.6 | 40 | 519 | 430 |
| 400 | 7.713 | 185 | 13.4 | 37 | 536 | 540 |
| 500 | 7.675 | 178 | 13.1 | 35 | 553 | 665 |
| 600 | 7.634 | 166 | 14.8 | 32 | 720 | 802 |
| 700 | 7.592 | — | 15.3 | 28 | 611 | 964 |
| 800 | 7.565 | — | 15 | 24 | 712 | 1152 |
| 900 | 7.489 | — | 16.3 | 25 | 703 | 1196 |
| 1000 | — | — | 16.8 | — | 699 | — |
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 1.1, 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.
Mn 0,10-0,40 · Si 0,10-0,30
- ΔMn 0.00
- ΔSi 0.00
- 21 designations
Mn 0,10-0,40 · Si 0,10-0,30
- ΔMn 0.00
- ΔSi 0.00
- 44 designations
Mn 0,10-0,40 · Si 0,10-0,30
- ΔMn 0.00
- ΔSi 0.00
- 26 designations
Mn 0,10-0,40 · Si 0,10-0,30
- ΔMn 0.00
- ΔSi 0.00
- 67 designations
Mn 0,10-0,35 · Si 0,10-0,30
- ΔMn 0.03
- ΔSi 0.00
- 9 designations
Mn 0,10-0,35 · Si 0,10-0,30
- ΔMn 0.03
- ΔSi 0.00
- 32 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.