Expanded panels are more rigid than perforated panels and are for use when structural stability is important. They can be formed and welded; however, they are more difficult to cut than perforated panels. Raised panels have strands that overlap to provide a skid-resistant surface. Use them to create safety guards for equipment and machinery.
Steel is lightly oiled.
1100 aluminum is about half the weight of steel and resists corrosion in wet environments.
3003 aluminum is easier to form than 1100 aluminum. It's about half the weight of steel and resists corrosion in wet environments.
304 stainless steel is more corrosion resistant than galvanized steel. It also has good chemical resistance.