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Yield Strength
The stress at which a material begins to deform permanently, used as the basis for structural steel selection.
Yield strength (measured in MPa - megapascals) is the stress level at which steel transitions from elastic (temporary) to plastic (permanent) deformation. It's the key property for structural steel design.
Relevance to attachments:
- Higher yield = can handle more load before permanent bending
- Enables lighter designs at same strength (as with Strenx)
- Must exceed maximum expected working stresses with safety factor
Typical values:
- Standard structural steel (S355): 355 MPa
- Strenx 700: 700 MPa
- Strenx 900: 900 MPa
- Strenx 1100: 1100 MPa
Design considerations:
- Safety factor typically 1.5-2.0 for attachment structures
- Fatigue life at a weld depends on the weld detail, not on the yield strength, so thinner high-strength plate can leave less margin at the welds
- Higher yield enables thinner plate = weight reduction
- But weldability may require special procedures
Sieruta uses Strenx high-strength steels to reduce attachment weight at the same strength.