Unalloyed structural steels
Unalloyed structural steels include all low-carbon steels in which the iron companions do not exceed specified minimum values. The yield strength, formability and weldability are the decisive factors for their use. They are soft, pliable, tough and stretchy, but cannot be hardened by heat treatment.
| Grade | Material no. | P | S | C | Mn | Si | N |
|---|---|---|---|---|---|---|---|
| STKM12C | — | max 0.04 | max 0.04 | max 0.2 | max 0.6 | max 0.35 | — |
| SR240 | — | max 0.05 | max 0.05 | — | — | — | — |
| SGDB | — | max 0.045 | max 0.045 | — | — | — | — |
| STKM14A | — | max 0.04 | max 0.04 | max 0.3 | 0.3 - 1 | max 0.35 | — |
| SD400 | — | max 0.05 | max 0.05 | — | — | — | — |
| STK400 | — | max 0.04 | max 0.04 | max 0.25 | — | — | — |
| SGD4 | — | max 0.045 | max 0.045 | 0.2 - 0.25 | 0.3 - 0.6 | — | — |
| STKM15C | — | max 0.04 | max 0.04 | 0.25 - 0.35 | 0.3 - 1 | max 0.35 | — |
| SD600 | — | — | — | — | — | — | — |
| SM490YA | — | max 0.035 | max 0.035 | max 0.2 | max 1.6 | max 0.55 | — |
| SR235 | — | max 0.05 | max 0.05 | — | — | — | — |
| STKM17C | — | max 0.04 | max 0.04 | 0.45 - 0.55 | 0.4 - 1 | max 0.4 | — |
| SPS400 | — | max 0.04 | max 0.04 | max 0.25 | — | — | — |
| STAM290GA | — | max 0.035 | max 0.035 | max 0.12 | max 0.6 | max 0.35 | — |
| SFB1 | — | max 0.03 | max 0.035 | 0.05 - 0.2 | 0.3 - 0.9 | 0.15 - 0.5 | — |
| STKM19A | — | max 0.04 | max 0.04 | max 0.25 | max 1.5 | max 0.55 | — |
| SWP400 | — | max 0.04 | max 0.04 | max 0.25 | — | — | — |
| STAM440G | — | max 0.035 | max 0.035 | max 0.25 | 0.3 - 0.9 | max 0.35 | — |
| SFB5 | — | max 0.03 | max 0.035 | 0.28 - 0.45 | 0.5 - 1.2 | 0.15 - 0.5 | — |
| STC510A | — | max 0.04 | max 0.04 | max 0.25 | 0.3 - 0.9 | max 0.35 | — |
| SPPH380 | — | max 0.035 | max 0.035 | max 0.25 | 0.3 - 1.1 | 0.1 - 0.35 | — |
| STAM470H | — | max 0.035 | max 0.035 | max 0.25 | 0.3 - 0.9 | max 0.35 | — |
| SF390A | — | max 0.03 | max 0.035 | max 0.6 | 0.3 - 1.2 | 0.15 - 0.5 | — |
| SRR235 | — | max 0.03 | max 0.02 | max 0.27 | max 1.9 | max 0.55 | — |
| SS490 | — | max 0.05 | max 0.05 | — | — | — | — |
| SF590A | — | max 0.03 | max 0.035 | max 0.6 | 0.3 - 1.2 | 0.15 - 0.5 | — |
| SN400B | — | max 0.03 | max 0.015 | max 0.22 | 0.6 - 1.5 | max 0.35 | — |
| STKR400 | — | max 0.04 | max 0.04 | max 0.25 | — | — | — |
| STW290 | — | max 0.04 | max 0.04 | — | — | — | — |
| SWH400 | — | max 0.03 | max 0.015 | max 0.2 | max 1.4 | max 0.35 | — |
| STKN490B | — | max 0.03 | max 0.015 | max 0.22 | max 1.6 | max 0.55 | max 0.006 |
| STC540 | — | max 0.04 | max 0.04 | max 0.25 | max 1.6 | max 0.55 | — |
| STS410 | — | max 0.035 | max 0.035 | max 0.3 | 0.3 - 1.4 | 0.1 - 0.35 | — |
| 1.0009 | 1.0009 | ~0,06 | ~0,050 | ~0,18 | — | ~0,60 | ~0,10 |
| C8D | 1.0010 | 0,07 | 0,06 | ≤0,10 | ≤0,50 | ≤0,30 | — |
| D 12-2 | 1.0012 | 0,05 | 0,05 | ≤0,12 | ≤0,50 | Spuren/Traces | 0,007 |
| S240GP | 1.0021 | 0,045 | 0,045 | ≤0,20 | — | — | 0,009 |
| S270GP | 1.0023 | 0,045 | 0,045 | ≤0,24 | — | — | 0,009 |
| L195 | 1.0026 | 0,035 | 0,03 | ≤0,20 | ≤1,40 | — | — |
| S205G1T | 1.0028 | 0,05 | 0,05 | ≤0,15 | 0,20-0,50 | Spuren/Traces | 0,007 |
| St 00 | 1.0030 | 0,08 | 0,05 | ≤0,30 | 0,20-0,50 | ≤0,30 | — |
| E190 | 1.0031 | 0,025 | 0,025 | ≤0,10 | ≤0,70 | ≤0,35 | — |
| S205GT | 1.0032 | 0,05 | 0,05 | ≤0,15 | 0,20-0,50 | ≤0,30 | 0,007 |
| E155 | 1.0033 | 0,025 | 0,025 | ≤0,11 | ≤0,70 | ≤0,35 | — |
| E195 | 1.0034 | 0,025 | 0,025 | ≤0,15 | ≤0,70 | ≤0,35 | — |
| S185 | 1.0035 | — | — | — | — | — | — |
| S235JRG1+CR | 1.0036 | 0,04 | 0,035 | ≤0,17 | — | — | 0,007 |
| S235JR | 1.0036 | 0,045 | 0,045 | ≤0,17 | ≤1,40 | — | 0,007 |
| S235JR | 1.0037 | 0,045 | 0,045 | ≤0,17 | ≤1,40 | — | 0,009 |
| S235JR+CR | 1.0037 | 0,04 | 0,035 | ≤0,17 | — | — | 0,009 |
Standards covering this category
32- DIN / EN314 grades
- JIS147 grades
- KS92 grades
- BS60 grades
- ČSN56 grades
- AISI / SAE53 grades
- AFNOR52 grades
- UNS48 grades
- GOST40 grades
- UNI38 grades
- GB36 grades
- UNE33 grades
- PN32 grades
- SS28 grades
- ASTM27 grades
- STN27 grades
- ÖNORM26 grades
- NBN26 grades
- MSZ24 grades
- ISO23 grades
- BDS18 grades
- STAS17 grades
- SRPS13 grades
- SANS10 grades
- SFS10 grades
- NP7 grades
- ABNT NBR7 grades
- AS / NZS7 grades
- NS5 grades
- SNV4 grades
- CSA3 grades
- HRN2 grades
Property ranges
21| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| ReH | N/mm² | 120 | 550 | 45 |
| Rm | N/mm² | 255 | 1050 | 182 |
| A80 | % | 4 | 32 | 17 |
| Re | N/mm² | 165 | 700 | 145 |
| A | % | 5 | 41 | 151 |
| A5 | % | 7 | 36 | 29 |
| Z | % | 18 | 68 | 23 |
| aK | J/cm² | 29 | 98 | 4 |
| KCU | kJ/m² | 240 | 780 | 6 |
| HB | — | 90 | 255 | 28 |
| HV | — | 100 | 105 | 3 |
| rho | g/cm³ | 7.582 | 7.871 | 319 |
| E | GPa | 141 | 213 | 7 |
| alpha | 10^-6/K | 11 | 15.6 | 6 |
| lambda | W/(m·K) | 27 | 76 | 6 |
| cp | J/(kg·K) | 466 | 875 | 6 |
| rho_el | nΩ·m | 140 | 1135 | 5 |
| Ac1 | °C | 720 | 745 | 13 |
| Ac3 | °C | 770 | 880 | 13 |
| Ar3 | °C | 755 | 854 | 12 |
| Ar1 | °C | 677 | 700 | 13 |
Derived from 319 grades in this category with a recorded value.
Composition range
15| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| B | % | 0.0008 | 0.005 | 1 |
| C | % | 0.004 | 0.6 | 318 |
| N | % | 0.0012 | 0.1 | 85 |
| Al | % | 0.01 | 0.06 | 38 |
| Si | % | 0.03 | 4.5 | 217 |
| P | % | 0.01 | 0.12 | 336 |
| S | % | 0.015 | 0.08 | 336 |
| Ti | % | 0.03 | 0.3 | 26 |
| V | % | 0.02 | 0.2 | 11 |
| Cr | % | 0.12 | 0.5 | 18 |
| Mn | % | 0.03 | 1.9 | 283 |
| Ni | % | 0.12 | 0.3 | 17 |
| Cu | % | 0.03 | 0.55 | 42 |
| Nb | % | 0.01 | 0.08 | 12 |
| Mo | % | 0.05 | 0.35 | 14 |
Derived from 336 grades in this category with a recorded value.
Heat treatment
3| Operation | MinTemperature (°C) | MaxTemperature (°C) | Grades |
|---|---|---|---|
| normalizing | — | — | 4 |
| annealing | — | — | 3 |
| tempering | — | — | 1 |