Hot-rolled Steel Sheets

370 – 590N/mm2 Class Bake Hardenability Type (TS Increase) Hot-rolled High Strength Steel Sheets
(JFE-HAxxxBHT)

Front rail extensionFront dash member

Characteristics

  • High formability by low strength during forming.
  • High impact property with high strength when car is completed.
    Extreme increase of yield and tensile strengths by press forming and paint baking treatment.

Example for applications

  • Structural parts of automobile
  • Side member, cross member, pillar, etc.

Data

Fig. 1 Flow chart of
automobile production

1

Fig. 2 Relation between deformation and
strength of developed steel

2

Fig. 3 Comparison of TS increase of
conventional and developed steels

3

Fig. 4 Effects of thinning of sheet and
improvement of anti-impact property of
developed steel sheet
(Tested sample : 60mm × 300mm column)

4

Table 1 Typical mechanical properties

Thickness
(mm)		 YS
(N/mm2)		 TS
(N/mm2)		 El
(%)		 BH*
(N/mm2)		 ΔTS**
(N/mm2)
1.4 370 478 34 95 57
* 2%Strain » 170°C × 20min.
** 10%Strain » 170°C × 20min.