This publication provides an overview of material selection for equipment exposed to chlorine, hydrogen chloride, and hydrochloric acid in industrial environments. It explains how moisture, contaminants, and process conditions dramatically affect corrosion behavior, and it summarizes the performance of carbon steels, stainless steels, nickel-containing alloys, and reactive metals under various operating conditions. The guide also presents corrosion limits, typical applications, and recommended alloys for safe and reliable service.