Research and Development > Technical Report > No.10 Special Issue on High Strength Steel Sheets > Newly-Developed Ultra-High Tensile Strength Steels with Excellent Formability and Weldability

No.10 Special Issue on High Strength Steel Sheets

Newly-Developed Ultra-High Tensile Strength Steels with Excellent Formability and Weldability

MATSUOKA Saiji     HASEGAWA Kohei     TANAKA Yasushi

Abstract

JFE Steel has developed and commercialized ultrahigh tensile strength steel series from TS780 MPa to 1 470 MPa with excellent formability and weldability which reduces weight and increases safety in collision when they are applied to the reinforcement parts around a cabin. Those ultra-high tensile strength steels are developed by applying JFE Steel’s own technology, continuous annealing line water-quenching facilities which greatly contribute to reduce alloy elements in the steel. Especially, the TS1180 MPa steel which is expected to expand in application, excels in elongation. It is 1.5 times larger than the conventional one which is the same level with 980 MPa, and strech-flangeability has also been achieved as the same level with TS980 MPa. It is remarkable work-hardenability and bake-hardenability make it possible to replace hot-stamping parts.

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