Cold-rolled Steel Sheets

340 – 440 N/mm2 Class Extra Deep Drawing Quality Cold-rolled High Strength Steel Sheets SFGHITEN ® (JFE-CAxxxG,JFE-CAxxxG-GZ,GA)

Fig 1 SFGHITEN® material designin

1

Characteristics

  • Superior deep drawing quality with high mean r-value
  • Superior panel shape accuracy with low yield strength
  • Superior coating property (Superior surface)
  • Superior anti-secondary-work brittleness

SFG : Super Fine Grain

Applications

  • Suitable for exposed panel with severe forming such as side panel
  • Available for inner part with severe deep drawing

Data

Table 1 Typical mechanical properties of SFGHITEN®

Product Grade Thickness
(mm)		 YS
(N/mm2)		 TS
(N/mm2)		 El
(%)		 r Value Tc
(°C)
COLD 390 1.0 238 405 40 1.9 -85
440 1.0 290 446 37 1.9 -65
GA 390 1.0 235 400 38 1.7 -65
440 1.0 285 442 35 1.7 -45
GA 440 1.0 310 445 35 1.15 -20
CR : Cold-rolled
GA : Hot-dip galvannealed steel
Tensile test : JIS No.5 tensile specimen.  Tensile test direction : Transverse to rolling direction
Tc : Secondary-working ductility-brittleness transition temperature
(Expanding test of cup cylinder, drawing ratio : 2.0)

Fig. 2 Comparison of properties between
conventional galvannealed steel and
SFG HITEN®
Fig. 2
Fig. 3 Recommended part for SFG HITEN®
Fig. 3   (Photo is ULSAB project body)