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![Fine-grain structural steels](/images/uploads/b50ed8f6-957e-437c-bf7f-29ff6f6a6c68/fine-grain-structural-steels-category-welded-box-girder-1920x1080.jpg)

Category · 50 grades

# 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](/materials/din-en/p245gh "P245GH") | [1.0352](/materials/material-no/1.0352 "1.0352") | 0,08-0,20 | ≤0,40 | 0,025 | 0,015 | 0,50-1,30 | ≤0,30 |
| [L245MB](/materials/din-en/l245mb "L245MB") | [1.0418](/materials/material-no/1.0418 "1.0418") | ≤0,16 | ≤0,45 | 0,025 | 0,02 | ≤1,50 | ≤0,30 |
| [C22.3](/materials/din-en/c22-3 "C22.3") | [1.0427](/materials/material-no/1.0427 "1.0427") | 0,18-0,23 | 0,15-0,35 | 0,035 | 0,03 | 0,30-0,90 | ≤0,30 |
| [P305GH](/materials/din-en/p305gh "P305GH") | [1.0436](/materials/material-no/1.0436 "1.0436") | 0,15-0,20 | ≤0,40 | 0,025 | 0,015 | 0,90-1,60 | ≤0,30 |
| [L245NB](/materials/din-en/l245nb "L245NB") | [1.0457](/materials/material-no/1.0457 "1.0457") | ≤0,16 | ≤0,40 | 0,025 | 0,02 | ≤1,10 | ≤0,30 |
| [S255N](/materials/din-en/s255n "S255N") | [1.0461](/materials/material-no/1.0461 "1.0461") | ≤0,18 | ≤0,40 | 0,035 | 0,03 | 0,50-1,30 | ≤0,30 |
| [P255NH](/materials/din-en/p255nh "P255NH") | [1.0462](/materials/material-no/1.0462 "1.0462") | ≤0,18 | ≤0,40 | 0,035 | 0,03 | 0,50-1,30 | ≤0,30 |
| [P255NL](/materials/din-en/p255nl "P255NL") | [1.0463](/materials/material-no/1.0463 "1.0463") | ≤0,16 | ≤0,40 | 0,03 | 0,025 | 0,50-1,30 | ≤0,30 |
| [1.0486](/materials/material-no/1.0486 "1.0486") | [1.0486](/materials/material-no/1.0486 "1.0486") | ≤0,16 | ≤0,40 | 0,025 | 0,01 | 0,80-1,50 | ≤0,30 |
| [P275NH](/materials/din-en/p275nh "P275NH") | [1.0487](/materials/material-no/1.0487 "1.0487") | ≤0,16 | ≤0,40 | 0,025 | 0,015 | 0,80-1,50 | ≤0,30 |
| [A662Gr.A](/materials/din-en/a662gr-a "A662Gr.A") | [1.0488](/materials/material-no/1.0488 "1.0488") | ≤0,16 | ≤0,40 | 0,025 | 0,015 | 0,60-1,50 | ≤0,30 |
| [1.0486](/materials/material-no/1.0486 "1.0486") | [1.0490](/materials/material-no/1.0490 "1.0490") | ≤0,18 | ≤0,40 | 0,03 | 0,025 | 0,50-1,50 | ≤0,30 |
| [S275NL](/materials/din-en/s275nl "S275NL") | [1.0491](/materials/material-no/1.0491 "1.0491") | ≤0,16 | ≤0,40 | 0,025 | 0,02 | 0,50-1,50 | ≤0,30 |
| [P315N](/materials/din-en/p315n "P315N") | [1.0505](/materials/material-no/1.0505 "1.0505") | ≤0,18 | ≤0,45 | 0,035 | 0,03 | 0,70-1,50 | ≤0,30 |
| [P315NH](/materials/din-en/p315nh "P315NH") | [1.0506](/materials/material-no/1.0506 "1.0506") | ≤0,18 | ≤0,45 | 0,035 | 0,03 | 0,70-1,50 | ≤0,30 |
| [P315NL](/materials/din-en/p315nl "P315NL") | [1.0508](/materials/material-no/1.0508 "1.0508") | ≤0,16 | ≤0,45 | 0,03 | 0,025 | 0,70-1,50 | ≤0,30 |
| [S355NH](/materials/din-en/s355nh "S355NH") | [1.0539](/materials/material-no/1.0539 "1.0539") | ≤0,20 | ≤0,50 | 0,035 | 0,03 | 0,90-1,65 | ≤0,30 |
| [S355NH](/materials/din-en/s355nh "S355NH") | [1.0545](/materials/material-no/1.0545 "1.0545") | ≤0,20 | ≤0,50 | 0,03 | 0,025 | 0,90-1,65 | ≤0,30 |
| [A633Gr.D](/materials/din-en/a633gr-d "A633Gr.D") | [1.0546](/materials/material-no/1.0546 "1.0546") | ≤0,18 | ≤0,50 | 0,025 | 0,02 | 0,90-1,65 | ≤0,30 |
| [1.0562](/materials/material-no/1.0562 "1.0562") | [1.0562](/materials/material-no/1.0562 "1.0562") | ≤0,18 | ≤0,50 | 0,025 | 0,015 | 1,10-1,70 | ≤0,30 |
| [P355NH](/materials/din-en/p355nh "P355NH") | [1.0565](/materials/material-no/1.0565 "1.0565") | ≤0,18 | ≤0,50 | 0,025 | 0,015 | 1,10-1,70 | ≤0,30 |
| [1.0566](/materials/material-no/1.0566 "1.0566") | [1.0566](/materials/material-no/1.0566 "1.0566") | ≤0,18 | ≤0,50 | 0,025 | 0,015 | 1,10-1,70 | ≤0,30 |
| [RoSt 52-3](/materials/din-en/rost-52-3 "RoSt 52-3") | [1.0576](/materials/material-no/1.0576 "1.0576") | ≤0,22 | ≤0,55 | 0,03 | 0,03 | ≤1,60 | — |
| [S255NL1](/materials/din-en/s255nl1 "S255NL1") | [1.1103](/materials/material-no/1.1103 "1.1103") | ≤0,16 | ≤0,40 | 0,025 | 0,015 | 0,50-1,30 | ≤0,30 |
| [P275NL2](/materials/din-en/p275nl2 "P275NL2") | [1.1104](/materials/material-no/1.1104 "1.1104") | ≤0,16 | ≤0,40 | 0,02 | 0,01 | 0,60-1,50 | ≤0,30 |
| [S315NL1](/materials/din-en/s315nl1 "S315NL1") | [1.1105](/materials/material-no/1.1105 "1.1105") | ≤0,16 | ≤0,45 | 0,025 | 0,015 | 0,70-1,50 | ≤0,30 |
| [P355NL2](/materials/din-en/p355nl2 "P355NL2") | [1.1106](/materials/material-no/1.1106 "1.1106") | ≤0,18 | ≤0,50 | 0,02 | 0,01 | 1,10-1,70 | ≤0,30 |
| [S355ML](/materials/din-en/s355ml "S355ML") | [1.8834](/materials/material-no/1.8834 "1.8834") | ≤0,14 | ≤0,50 | 0,025 | 0,02 | ≤1,60 | ≤0,30 |
| [FeE420KTTM](/materials/din-en/fee420kttm "FeE420KTTM") | [1.8836](/materials/material-no/1.8836 "1.8836") | ≤0,16 | ≤0,50 | 0,025 | 0,02 | ≤1,70 | ≤0,30 |
| [P460Q](/materials/din-en/p460q "P460Q") | [1.8870](/materials/material-no/1.8870 "1.8870") | ≤0,18 | ≤0,50 | 0,025 | 0,01 | ≤1,70 | ≤0,50 |
| [1.8900](/materials/material-no/1.8900 "1.8900") | [1.8900](/materials/material-no/1.8900 "1.8900") | ≤0,20 | 0,10-0,60 | 0,035 | 0,03 | 1,00-1,70 | ≤0,30 |
| [S460N](/materials/din-en/s460n "S460N") | [1.8901](/materials/material-no/1.8901 "1.8901") | ≤0,20 | ≤0,60 | 0,03 | 0,025 | 1,00-1,70 | ≤0,30 |
| [1.8902](/materials/material-no/1.8902 "1.8902") | [1.8902](/materials/material-no/1.8902 "1.8902") | ≤0,20 | ≤0,60 | 0,03 | 0,025 | 1,00-1,70 | ≤0,30 |
| [S460NL](/materials/din-en/s460nl "S460NL") | [1.8903](/materials/material-no/1.8903 "1.8903") | ≤0,20 | ≤0,60 | 0,025 | 0,02 | 1,00-1,70 | ≤0,30 |
| [1.8905](/materials/material-no/1.8905 "1.8905") | [1.8905](/materials/material-no/1.8905 "1.8905") | ≤0,20 | ≤0,60 | 0,025 | 0,02 | 1,00-1,70 | ≤0,30 |
| [S500N](/materials/din-en/s500n "S500N") | [1.8907](/materials/material-no/1.8907 "1.8907") | ≤0,21 | 0,10-0,60 | 0,035 | 0,03 | 1,00-1,70 | ≤0,30 |
| [S380NL](/materials/din-en/s380nl "S380NL") | [1.8910](/materials/material-no/1.8910 "1.8910") | ≤0,20 | 0,10-0,60 | 0,03 | 0,025 | 1,00-1,70 | ≤0,30 |
| [S380NL1](/materials/din-en/s380nl1 "S380NL1") | [1.8911](/materials/material-no/1.8911 "1.8911") | ≤0,20 | 0,10-0,60 | 0,025 | 0,015 | 1,00-1,70 | ≤0,30 |
| [A738Gr.C](/materials/din-en/a738gr-c "A738Gr.C") | [1.8912](/materials/material-no/1.8912 "1.8912") | ≤0,20 | ≤0,60 | 0,025 | 0,02 | 1,00-1,70 | ≤0,30 |
| [S420NL1](/materials/din-en/s420nl1 "S420NL1") | [1.8913](/materials/material-no/1.8913 "1.8913") | ≤0,20 | 0,10-0,60 | 0,025 | 0,015 | 1,00-1,70 | ≤0,30 |
| [P460NL1](/materials/din-en/p460nl1 "P460NL1") | [1.8915](/materials/material-no/1.8915 "1.8915") | ≤0,20 | ≤0,60 | 0,025 | 0,02 | 1,10-1,70 | ≤0,30 |
| [S500NL](/materials/din-en/s500nl "S500NL") | [1.8917](/materials/material-no/1.8917 "1.8917") | ≤0,21 | 0,10-0,60 | 0,03 | 0,025 | 1,00-1,70 | ≤0,30 |
| [P460NL2](/materials/din-en/p460nl2 "P460NL2") | [1.8918](/materials/material-no/1.8918 "1.8918") | ≤0,20 | ≤0,60 | 0,025 | 0,015 | 1,10-1,70 | ≤0,30 |
| [S500NL1](/materials/din-en/s500nl1 "S500NL1") | [1.8919](/materials/material-no/1.8919 "1.8919") | ≤0,21 | 0,10-0,60 | 0,025 | 0,015 | 1,00-1,70 | ≤0,30 |
| [P380NH](/materials/din-en/p380nh "P380NH") | [1.8930](/materials/material-no/1.8930 "1.8930") | ≤0,20 | 0,10-0,60 | 0,035 | 0,03 | 1,00-1,70 | ≤0,30 |
| [P420NH](/materials/din-en/p420nh "P420NH") | [1.8932](/materials/material-no/1.8932 "1.8932") | ≤0,20 | 0,10-0,60 | 0,025 | 0,015 | 1,00-1,70 | ≤0,30 |
| [P460NH](/materials/din-en/p460nh "P460NH") | [1.8935](/materials/material-no/1.8935 "1.8935") | ≤0,20 | ≤0,60 | 0,025 | 0,015 | 1,10-1,70 | ≤0,30 |
| [P500NH](/materials/din-en/p500nh "P500NH") | [1.8937](/materials/material-no/1.8937 "1.8937") | ≤0,21 | 0,10-0,60 | 0,035 | 0,03 | 1,00-1,70 | ≤0,30 |
| [L555MB](/materials/din-en/l555mb "L555MB") | [1.8978](/materials/material-no/1.8978 "1.8978") | ≤0,16 | ≤0,45 | 0,025 | 0,02 | ≤1,80 | ≤0,30 |
| [A 299](/materials/din-en/a-299 "A 299") | [1.9515](/materials/material-no/1.9515 "1.9515") | ≤0,28 | 0,15-0,40 | 0,035 | 0,035 | 0,90-1,40 | — |

## Standards covering this category

 24

- [**DIN / EN***50 grades*](/materials/din-en "DIN / EN — 50 grades in this category")
- [**UNS***41 grades*](/materials/uns "UNS — 41 grades in this category")
- [**AISI / SAE***19 grades*](/materials/aisi-sae "AISI / SAE — 19 grades in this category")
- [**BS***17 grades*](/materials/bs "BS — 17 grades in this category")
- [**AFNOR***17 grades*](/materials/afnor "AFNOR — 17 grades in this category")
- [**UNI***14 grades*](/materials/uni "UNI — 14 grades in this category")
- [**GOST***9 grades*](/materials/gost "GOST — 9 grades in this category")
- [**SS***9 grades*](/materials/ss "SS — 9 grades in this category")
- [**JIS***8 grades*](/materials/jis "JIS — 8 grades in this category")
- [**GB***8 grades*](/materials/gb "GB — 8 grades in this category")
- [**ASTM***6 grades*](/materials/astm "ASTM — 6 grades in this category")
- [**ISO***6 grades*](/materials/iso "ISO — 6 grades in this category")
- [**PN***6 grades*](/materials/pn "PN — 6 grades in this category")
- [**UNE***5 grades*](/materials/une "UNE — 5 grades in this category")
- [**ČSN***5 grades*](/materials/csn "ČSN — 5 grades in this category")
- [**MSZ***4 grades*](/materials/msz "MSZ — 4 grades in this category")
- [**BDS***3 grades*](/materials/bds "BDS — 3 grades in this category")
- [**KS***3 grades*](/materials/ks "KS — 3 grades in this category")
- [**STAS***2 grades*](/materials/stas "STAS — 2 grades in this category")
- [**SFS***2 grades*](/materials/sfs "SFS — 2 grades in this category")
- [**SNV***2 grades*](/materials/snv "SNV — 2 grades in this category")
- [**STN***1 grade*](/materials/stn "STN — 1 grade in this category")
- [**AS / NZS***1 grade*](/materials/as-nzs "AS / NZS — 1 grade in this category")
- [**ÖNORM***1 grade*](/materials/onorm "ÖNORM — 1 grade in this category")

## Property 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 | Min Temperature (°C) | Max Temperature (°C) | Grades |
|---|---|---|---|
| normalizing | — | — | 3 |

## Related guides

 1

- [**Steel Grain Size and Its Effects**](/wiki/steel-families/steel-grain-size-and-its-effects "Steel Grain Size and Its Effects")