EN 10137-3 Grade S550AL quenched and tempered (+QT)

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S550AL is a precipitation hardening and weldable fine grained steel. yield point: >550 N/mm² application: welded steel constructions of various types, e.g. bridges and load-carrying constructions as well as transport vehicles, lifting and earthmoving machines. application limits: at -40°C is warranted a notch impact energy of 40 J (longitudinal test specimen) cold formability: for nominal size < 16 mm bending radius in transversal direction 3xs in longitudinal direction 4xs (s= nominal thickness) hot forming property: allowed only for stress relieve annealing temperature (max. 580°C) suitability for welding: Steel is weldable according to the common welding methods (EURONORM-INFORMATION Nr. 2 has to be considered)

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Equivalent Materials

This material data has been provided by WIAM.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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23.0 °C

7.8 g/cm³

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Typical for Steel



Elastic modulus

23.0 °C

190 - 210 GPa

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Typical for Steel


20.0 °C

16 %

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Poisson's ratio

23.0 °C

0.3 [-]

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Typical for Steel

Tensile strength

20.0 °C

650 - 820 MPa

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Yield strength

20.0 °C

530 - 550 MPa

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Chemical properties



0.03 - 0.12 %

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0.3 - 1.8 %

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0.02 %

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0.5 %

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0.01 %

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