Core Principle

This is a trade-off between "Machinability" and "Corrosion Resistance."

Material Comparison

303 (Free-Machining): Contains sulfur for easiest machining. Fastest cycle times, lowest cost. Poorest corrosion resistance, cannot be welded.

304 (General Purpose): Most common stainless steel. Good corrosion resistance and weldable. Balanced performance.

316 (Marine Grade): Contains molybdenum for best corrosion resistance against chlorides. Most difficult to machine, highest cost.

Selection Guide

• Choose 303 for cost reduction when welding not required
• Choose 304 for general corrosion resistance and welding
• Choose 316 only for saltwater or harsh chemical exposure