What is the difference between a Damascus and Sanmai blade construction?
Updated Mar 2026
Damascus construction folds and welds steel throughout the entire blade cross-section, so the hada pattern appears across the full width of the metal. Sanmai — meaning 'three layers' — is a lamination method where a hard high-carbon steel core is sandwiched between two outer layers of softer steel. The outer layers protect the core and provide flexibility, while the core holds a fine edge. On a Sanmai blade, the Damascus-style surface pattern (if present) comes from the outer cladding layers only, not from the core. This collection includes both construction types; pieces described as Sanmai steel katana will show surface layering while maintaining a distinct core-and-jacket laminate structure rather than a fully folded cross-section.