Cold-rolled Steel Sheets
780 – 1180N/mm² Class Cold-rolled Extra High Strength Steel Sheets with High Formability - WQ HITEN (JFE-CAxxxY2,SF)
Example of formed part ofWQ HITEN
(Low YR Type 980N/mm2
steel sheet)
Characteristics
Application of CAL-WQ(Water Quench) process
- Series of extra high strength steel sheets with high formability for tensile strength of 780N/mm2 - 1180N/mm2 Classes
- By designing chemical composition for low carbon equivalent , attain superior spot weldability (cross tensile) and anti-delayed fracture.
- With high speed and uniform cooling by WQ, attains superior quality stability.
Example for application
- Center pillar reinforcement
- Low YR Type 780 - 1180N/mm2
- Seat frame
- High λ Type 780 - 980N/mm2
- Extra λ Type 980N/mm2(For fixing)
- Bumper
- High λ Type 980N/mm2
- High λ Type 1180N/mm2
- Door impact beam
- High λ Type 1180N/mm2
Data
Fig. 1 Relation between elongation and hole expanding ratio of WQ HITEN
Table 1 Typical mechanical properties
| Grade | Design | Type | Thickness (mm) |
Mechanical properties* | Ceq.** (wt%) |
|||
|---|---|---|---|---|---|---|---|---|
| YS (N/mm2) |
TS (N/mm2) |
El (%) |
λ (%) |
|||||
| 780 | JFE-CA780Y2 | Low YR Type | 1.4 | 430 | 810 | 22 | 30 | 0.15 |
| JFE-CA780SF | High λ Type | 1.2 | 600 | 830 | 19 | 80 | 0.12 | |
| GA | JFE-CA980Y2 | Low YR Type | 1.2 | 610 | 1010 | 18 | 30 | 0.18 |
| 980 | JFE-CA980SF | High λ Type | 1.2 | 740 | 1020 | 16 | 50 | 0.18 |
| 800 | 1010 | 14 | 70 | 0.18 | ||||
| JFE-CA980SF2 | Extra High λ Type | 1.2 | 900 | 1020 | 7 | 100 | 0.09 | |
| 1180 | JFE-CA1180SF | High λ Type | 1.6 | 1030 | 1230 | 7 | 60 | 0.17 |
| JFE-CA1180Y2 | Low YR Type | 1.2 | 960 | 1210 | 14 | 30 | 0.23 | |
* Transverse to rolling direction, JIS No.5 tensile test specimen,
**Carbon equivalent considering weldability Ceq.=1.5C + P + 3S
**Carbon equivalent considering weldability Ceq.=1.5C + P + 3S
