What is the maximum sulfur content allowed in 300PLUS® PFC channel steel?

AS/NZS 3679.1 limits sulfur content in 300PLUS® PFC channel steel to 0.035% max. Sulfur forms iron sulfides, which are brittle and melt at low temperatures, causing "hot shortness"-cracking during hot rolling or welding. High sulfur levels also reduce ductility and toughness, making PFC channels prone to fracture under impact (e.g., during construction or cyclonic events). For example, a PFC channel with 0.040% sulfur might crack while being bent into a truss component for a Queensland school. To control sulfur, manufacturers use desulfurization processes (e.g., lime injection) during steelmaking and source low-sulfur scrap from Australian recycling facilities. Post-production, sulfur content is tested via combustion analysis, with results documented in the material certificate. This limit ensures 300PLUS® PFC channels withstand fabrication processes and Australian service conditions without premature failure.