Hot-dip Galvanized Steel Sheets
Galvannealed High Strength Steel Sheet with Excellent Formability
Advantages
- Customers can select the most suitable formability grade from 4 featured types including the conventional grade in every TS grade.
- Uniform series line-up in strength grades 590, 780, 980 and 1180MPa for cold-rolled and galvannealed steel sheets.
- Optimized material design considers weldability and anti-delayed fracture properties.
- Wide variety of sheet sizes produced.
Product line-up and features
| Name | Type | Features in formability | Suitable parts | |
|---|---|---|---|---|
| Conventional HSS | Conventional DP* | Good bendability required for stamping to a simple shape | Bumper, door impact beam | |
| JEFORMA | Type1 | High elongation DP* | Suitable for stretch-forming or drawing parts due to high elongation | B-pillar upper, A-pillar upper, front member, rear member |
| Type2 | High El- high λ** | Suitable for severe stretch-flange forming parts | B-pillar lower, A-pillar lower | |
| Type3 | Super high elongation (TRIP***) | Suitable for more severe stretch-forming or drawing parts due to extra-high elongation | Integrated b-pillar, Integrated A-pillar | |
- *DP:
- Dual Phase
- **λ：
- Hole expanding ratio, index of stretch-flangability
- ***TRIP：
- TRansformation Induced Plasticity
Material properties
Typicl mechanical properties
| Grade | Type | Name | YS (MPa) | TS (MPa) | Elongation (%) | Hole expanding ratio: λ (%) |
Development stage |
|---|---|---|---|---|---|---|---|
| 590 | Conventional DP | JAC590Y | 365 | 610 | 29 | 45 | Commercial production |
| High elongation DP | 590GA-type1 | 410 | 605 | 31 | 60 | Commercial production | |
| High El- high λ | 590GA-type2 | 410 | 600 | 33 | 80 | Developed | |
| 780 | Conventional DP | JAC780Y | 510 | 830 | 18 | 30 | Commercial production |
| High elongation DP | 780GA-type1 | 435 | 830 | 21 | 25 | Commercial production | |
| High El- high λ | 780GA-type2 | 590 | 810 | 22 | 70 | Developed | |
| Super high elongation (TRIP) | 780GA-type3 | 450 | 800 | 26 | 25 | Commercial production | |
| 980 | Conventional DP | JAC980Y | 630 | 1030 | 14 | 25 | Commercial production |
| High elongation DP | 980GA-type1 | 650 | 1020 | 18 | 30 | Commercial production | |
| High El- high λ | 980GA-type2 | 800 | 1020 | 16 | 60 | Developed | |
| 1180 | Conventional DP | JAC1180YL | 830 | 1230 | 11 | 20 | Commercial production |
| High elongation DP | 1180GA-type1 | 800 | 1220 | 13 | 20 | Developed |
- *DP:
- Dual Phase
- **λ：
- Hole expanding ratio, index of stretch-flangability
- ***TRIP：
- TRansformation Induced Plasticity
- 980MPa GA Type1(High elongation)
Type1 (High elongation) has the feature of high drawability and stretch-formability
A B-pillar lower part requiring severe stretch-formability was successfully press-formed.
- 590MPa GA Type2(High El- high λ)
Type2 (High El-high λ) features high stretch-flange-formability of sheared edges.
A B-pillar upper part requiring severe stretch-flange-formability was successfully press-formed.
- 1180MPa GA Type3(Super high elongation)
Type3 (super high elongation) features excellent drawability and stretch-formability.
An A-pillar lower part requiring severe deep-drawability was successfully press-formed.
Applicable Automotive Parts
Galvannealed high strength steel sheet series suitable for automotive structural parts due to excellent formability
JFE will provide the most suitable type of high strength steel from featured types of formability based on forming methods and shapes of parts. The highly-formable high strength steel sheet series JEFORMA® contributes stability of press-forming production and greatly expands the applications of high strength steel. JEFORMA® stands for JFE Excellent FORMAbility.