Machinery Repairman Practice Test

Low carbon steel is defined by a very small amount of carbon, which keeps the steel soft, ductile, and easy to weld. In practice, its carbon content is typically about 0.05% to 0.30% by weight. The other ranges exceed 0.30% and fall into medium or high carbon steel, which are harder and stronger but less formable and weldable. So the range 0.05–0.30% best matches low carbon steel.