| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.2 ( March 1981 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Characteristics of Formable Cold Rolled High Strength Steel Sheets for Automotive Use Characteristics of Formable Cold Rolled High Strength Steel Sheets for Automotive Use |
| Synopsis : Metallurgical factors affecting the press formability of cold rolled high strength steels are discussed and the properties of 40kgf/mm2 class tensile strength steels are examined. Dual phase steel, CHLY, consisting of ferrite-martensite structure produced by rapid cooling in continuous annealing line has very low yield to tensile strength ratio and high n-value. Rephosphorized steel, CHR, is a batch annealed aluminum killed steel hardened with phosphorus and manganese. It has high -value and relatively low yield strength. Recently developed steel, CHRX, with super deep drawing quality and high strength is characterized by its extremely high -value over 2.0 and low yield strength. It can be produced by continuous annealing of niobium-stabilized, extra low carbon, phosphorus-bearing steel. Spot weldability, formability and brittleness of the steels are also examined. |
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