High strength steel for concrete reinforcement or drawing - has high strength martensitic layer between case and core

摘要

High strength steel, esp. concrete reinforcing steel or stock for drawing, having improved material properties and workability and being of fine section or wire size range, is claimed. The novelty is that the steel has an inhomogeneous strength distribut-ion over its cross-section, with a high strength martensitic layer in the transition region between a reduced strength case layer and a softer core region. ADVANTAGE - The steel has increased strength, coilability and workability for use as concrete reinforcing steel, while retaining weldability, and has improved drawability for use as drawing stock.