Yield strength, tensile strength, elongation, and the effect of sampling direction on results.
Key items in a tensile test report:
- Yield strength (Rp0.2): the stress at which the material begins to deform plastically; a core indicator for design and material selection.
- Tensile strength (Rm): the maximum stress before fracture.
- Elongation (A): elongation after fracture, reflecting plasticity; important for bending and deep drawing.
Notes:
- Sampling direction: longitudinal (rolling direction) and transverse properties differ; the report should state the direction.
- Specimen shape and gauge length affect the elongation value.
- Austenitic stainless steel has no obvious yield plateau; use Rp0.2.
When checking a report, verify the test standard (GB/T 228.1 or ASTM A370) and the sampling location.
