Fine-grain structural steels
Fine-grain structural steel is a name for structural steels whose properties are particularly suitable for welding. They have a higher yield strength than comparable steels. Due to the negative influence of carbon on the weldability of a material, the maximum carbon content in fine-grained structural steels is less than 0.2%. These properties are achieved in steelmaking by the addition of oxygen and nitrogen-binding elements. The fine grain in the metallurgical structure is achieved by alloying elements whose nitrides and carbides only dissolve at higher temperatures. With the same composition, they are stronger and tougher than coarse-grained steels. Fine-grained structural steels are used above all in reinforced concrete structures such as bridges, in the construction of cranes, hydraulic cylinders or other welded structures due to their special welding suitability and in the offshore area.
| Grade | Material no. | C | Si | P | S | Mn | Cr |
|---|---|---|---|---|---|---|---|
| P245GH | 1.0352 | 0,08-0,20 | ≤0,40 | 0,025 | 0,015 | 0,50-1,30 | ≤0,30 |
| L245MB | 1.0418 | ≤0,16 | ≤0,45 | 0,025 | 0,02 | ≤1,50 | ≤0,30 |
| C22.3 | 1.0427 | 0,18-0,23 | 0,15-0,35 | 0,035 | 0,03 | 0,30-0,90 | ≤0,30 |
| P305GH | 1.0436 | 0,15-0,20 | ≤0,40 | 0,025 | 0,015 | 0,90-1,60 | ≤0,30 |
| L245NB | 1.0457 | ≤0,16 | ≤0,40 | 0,025 | 0,02 | ≤1,10 | ≤0,30 |
| S255N | 1.0461 | ≤0,18 | ≤0,40 | 0,035 | 0,03 | 0,50-1,30 | ≤0,30 |
| P255NH | 1.0462 | ≤0,18 | ≤0,40 | 0,035 | 0,03 | 0,50-1,30 | ≤0,30 |
| P255NL | 1.0463 | ≤0,16 | ≤0,40 | 0,03 | 0,025 | 0,50-1,30 | ≤0,30 |
| 1.0486 | 1.0486 | ≤0,16 | ≤0,40 | 0,025 | 0,01 | 0,80-1,50 | ≤0,30 |
| P275NH | 1.0487 | ≤0,16 | ≤0,40 | 0,025 | 0,015 | 0,80-1,50 | ≤0,30 |
| A662Gr.A | 1.0488 | ≤0,16 | ≤0,40 | 0,025 | 0,015 | 0,60-1,50 | ≤0,30 |
| 1.0486 | 1.0490 | ≤0,18 | ≤0,40 | 0,03 | 0,025 | 0,50-1,50 | ≤0,30 |
| S275NL | 1.0491 | ≤0,16 | ≤0,40 | 0,025 | 0,02 | 0,50-1,50 | ≤0,30 |
| P315N | 1.0505 | ≤0,18 | ≤0,45 | 0,035 | 0,03 | 0,70-1,50 | ≤0,30 |
| P315NH | 1.0506 | ≤0,18 | ≤0,45 | 0,035 | 0,03 | 0,70-1,50 | ≤0,30 |
| P315NL | 1.0508 | ≤0,16 | ≤0,45 | 0,03 | 0,025 | 0,70-1,50 | ≤0,30 |
| S355NH | 1.0539 | ≤0,20 | ≤0,50 | 0,035 | 0,03 | 0,90-1,65 | ≤0,30 |
| S355NH | 1.0545 | ≤0,20 | ≤0,50 | 0,03 | 0,025 | 0,90-1,65 | ≤0,30 |
| A633Gr.D | 1.0546 | ≤0,18 | ≤0,50 | 0,025 | 0,02 | 0,90-1,65 | ≤0,30 |
| 1.0562 | 1.0562 | ≤0,18 | ≤0,50 | 0,025 | 0,015 | 1,10-1,70 | ≤0,30 |
| P355NH | 1.0565 | ≤0,18 | ≤0,50 | 0,025 | 0,015 | 1,10-1,70 | ≤0,30 |
| 1.0566 | 1.0566 | ≤0,18 | ≤0,50 | 0,025 | 0,015 | 1,10-1,70 | ≤0,30 |
| RoSt 52-3 | 1.0576 | ≤0,22 | ≤0,55 | 0,03 | 0,03 | ≤1,60 | — |
| S255NL1 | 1.1103 | ≤0,16 | ≤0,40 | 0,025 | 0,015 | 0,50-1,30 | ≤0,30 |
| P275NL2 | 1.1104 | ≤0,16 | ≤0,40 | 0,02 | 0,01 | 0,60-1,50 | ≤0,30 |
| S315NL1 | 1.1105 | ≤0,16 | ≤0,45 | 0,025 | 0,015 | 0,70-1,50 | ≤0,30 |
| P355NL2 | 1.1106 | ≤0,18 | ≤0,50 | 0,02 | 0,01 | 1,10-1,70 | ≤0,30 |
| S355ML | 1.8834 | ≤0,14 | ≤0,50 | 0,025 | 0,02 | ≤1,60 | ≤0,30 |
| FeE420KTTM | 1.8836 | ≤0,16 | ≤0,50 | 0,025 | 0,02 | ≤1,70 | ≤0,30 |
| P460Q | 1.8870 | ≤0,18 | ≤0,50 | 0,025 | 0,01 | ≤1,70 | ≤0,50 |
| 1.8900 | 1.8900 | ≤0,20 | 0,10-0,60 | 0,035 | 0,03 | 1,00-1,70 | ≤0,30 |
| S460N | 1.8901 | ≤0,20 | ≤0,60 | 0,03 | 0,025 | 1,00-1,70 | ≤0,30 |
| 1.8902 | 1.8902 | ≤0,20 | ≤0,60 | 0,03 | 0,025 | 1,00-1,70 | ≤0,30 |
| S460NL | 1.8903 | ≤0,20 | ≤0,60 | 0,025 | 0,02 | 1,00-1,70 | ≤0,30 |
| 1.8905 | 1.8905 | ≤0,20 | ≤0,60 | 0,025 | 0,02 | 1,00-1,70 | ≤0,30 |
| S500N | 1.8907 | ≤0,21 | 0,10-0,60 | 0,035 | 0,03 | 1,00-1,70 | ≤0,30 |
| S380NL | 1.8910 | ≤0,20 | 0,10-0,60 | 0,03 | 0,025 | 1,00-1,70 | ≤0,30 |
| S380NL1 | 1.8911 | ≤0,20 | 0,10-0,60 | 0,025 | 0,015 | 1,00-1,70 | ≤0,30 |
| A738Gr.C | 1.8912 | ≤0,20 | ≤0,60 | 0,025 | 0,02 | 1,00-1,70 | ≤0,30 |
| S420NL1 | 1.8913 | ≤0,20 | 0,10-0,60 | 0,025 | 0,015 | 1,00-1,70 | ≤0,30 |
| P460NL1 | 1.8915 | ≤0,20 | ≤0,60 | 0,025 | 0,02 | 1,10-1,70 | ≤0,30 |
| S500NL | 1.8917 | ≤0,21 | 0,10-0,60 | 0,03 | 0,025 | 1,00-1,70 | ≤0,30 |
| P460NL2 | 1.8918 | ≤0,20 | ≤0,60 | 0,025 | 0,015 | 1,10-1,70 | ≤0,30 |
| S500NL1 | 1.8919 | ≤0,21 | 0,10-0,60 | 0,025 | 0,015 | 1,00-1,70 | ≤0,30 |
| P380NH | 1.8930 | ≤0,20 | 0,10-0,60 | 0,035 | 0,03 | 1,00-1,70 | ≤0,30 |
| P420NH | 1.8932 | ≤0,20 | 0,10-0,60 | 0,025 | 0,015 | 1,00-1,70 | ≤0,30 |
| P460NH | 1.8935 | ≤0,20 | ≤0,60 | 0,025 | 0,015 | 1,10-1,70 | ≤0,30 |
| P500NH | 1.8937 | ≤0,21 | 0,10-0,60 | 0,035 | 0,03 | 1,00-1,70 | ≤0,30 |
| L555MB | 1.8978 | ≤0,16 | ≤0,45 | 0,025 | 0,02 | ≤1,80 | ≤0,30 |
| A 299 | 1.9515 | ≤0,28 | 0,15-0,40 | 0,035 | 0,035 | 0,90-1,40 | — |
Standards covering this category
24Property ranges
10| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| ReH | N/mm² | 205 | 460 | 23 |
| Rm | N/mm² | 350 | 730 | 26 |
| Re | N/mm² | 195 | 450 | 8 |
| A | % | 17 | 24 | 17 |
| A5 | % | 19 | 26 | 6 |
| rho | g/cm³ | 7.85 | 7.85 | 50 |
| Ac1 | °C | 720 | 723 | 2 |
| Ac3 | °C | 880 | 907 | 2 |
| Ar3 | °C | 780 | 780 | 1 |
| Ar1 | °C | 620 | 620 | 1 |
Derived from 50 grades in this category with a recorded value.
Composition range
16| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| B | % | 0.005 | 0.005 | 1 |
| C | % | 0.08 | 0.28 | 50 |
| N | % | 0.012 | 0.025 | 45 |
| Al | % | 0.015 | 0.06 | 44 |
| Si | % | 0.1 | 0.6 | 50 |
| P | % | 0.02 | 0.035 | 50 |
| S | % | 0.01 | 0.035 | 50 |
| Ti | % | 0.03 | 0.2 | 34 |
| V | % | 0.02 | 0.22 | 38 |
| Cr | % | 0.3 | 0.5 | 48 |
| Mn | % | 0.3 | 1.8 | 50 |
| Ni | % | 0.3 | 1 | 44 |
| Cu | % | 0.2 | 0.7 | 47 |
| Zr | % | 0.05 | 0.05 | 1 |
| Nb | % | 0.01 | 0.06 | 44 |
| Mo | % | 0.08 | 0.5 | 46 |
Derived from 50 grades in this category with a recorded value.
Heat treatment
1| Operation | MinTemperature (°C) | MaxTemperature (°C) | Grades |
|---|---|---|---|
| normalizing | — | — | 3 |