CSA Certification of Welding Inspectors (W178.2) Level 1 Practice Test

Carbon content defines the steel family. When the carbon content is below 0.8%, the steel is considered carbon steel (plain carbon steel). The 0.8% threshold distinguishes high‑carbon or tool steels from regular carbon steels, which have lower carbon levels. Since the steel in question has carbon content less than 0.8%, the proper classification is carbon steel with less than 0.8% carbon. The other options don’t fit because they either imply no carbon, an exact 0.8%, or a carbon content above 0.8%.