Materials
How to compare tensile strength, yield strength, hardness, modulus, density, elongation, fatigue, corrosion, and material condition.
Back to Engineering FAQsView Engineering GuidesYield strength describes the stress where permanent deformation begins, while ultimate tensile strength describes the maximum stress before failure. They answer different design questions and should not be merged.
Hardness values are comparable only when the scale and method are compatible, such as HRC, HRB, HV, or HB. Conversions across hardness scales can be approximate and should be flagged when material type or method is not clear.
Preserve alloy grade, temper, heat treatment, product form, test direction, temperature, standard, thickness range, and whether values are minimums, typicals, allowables, or examples.
