1. Physical properties: density, appearance, thermal conductivity, optical properties, magnetic properties, electrical properties, superconducting properties, shape memory properties, etc.
2. Chemical properties: heat resistance, corrosion resistance, light resistance, catalytic properties, photosensitive properties, etc., stainless steel uses corrosion resistance, high-temperature alloys use heat resistance, etc.
3. Mechanical properties: hardness, strength, plasticity, toughness, impact, fatigue, elasticity, etc., such as cutting tools using hardness, structural materials using strength, deformation processing using plasticity, elastic materials using elasticity, and fatigue properties, armored steel using impact properties, etc. Wait.
