EN 10088-2 and ASTM A240 are the two standards most often encountered when buying stainless flat products. Whether they can be interchanged depends on the grade and application.

Similarities: both specify grades, chemical composition, mechanical properties and delivery condition. 1.4301 vs 304 and 1.4404 vs 316L are generally regarded as corresponding grades.

Differences:

• Chemistry ranges: upper/lower limits and permitted deviations for Cr, Ni and Mo are not identical. • Mechanical properties: guaranteed yield, tensile and elongation values differ. • Inspection and retest rules: sampling position, test methods and certificate content differ. • Surface and dimensional standards: EN frequently references EN 10051 / EN 10131, ASTM references A480 and others.

Practical advice:

1) State the standard and grade on the design drawing (e.g. "304 per ASTM A240" or "1.4301 per EN 10088-2"). 2) When dual certification is required, ask the supplier to list both standards' chemistry and properties on the mill certificate. 3) For pressure, low-temperature or safety-related parts, run project-specific supplementary tests rather than relying on a grade equivalence table.

In short: common grades correspond, but "corresponding" does not mean "unconditionally interchangeable".