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Related products : B340/590DP high-strength dual-phase steel
B400/780DP high-strength dual-phase steel, a phase change strengthening steel, is in a structure mainly composed of ferrite and martensite, which is dispersed in certain quantity to ferritic matrix by adoption of special chemical compositions and production process. While it gets rained in strength, it gets improved at formability. It is featured with low yield strength, no yield elongation, high strain strengthening index and excellent collision-resistance and can increase safety of automobiles while lowering their weight.
B400/780DP high-strength dual-phase steel chemical composition:
Steel grade |
Chemical composition % |
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|
C |
Si |
Mn |
P |
S |
Alt |
|
|
B400/780DP |
≤0.20 |
≤0.80 |
≤2.50 |
≤0.035 |
≤0.030 |
≥0.020 |
B400/780DP high-strength dual-phase steel mechanical performance:
Steel grade |
Yield |
Tensile |
After Breakage Percent Elongation b |
180°bending test |
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|
Nominal thickness mm |
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|
|
|
|
Bending center diameter |
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|
B400/780DP |
400~590 |
780 |
- |
14 |
16 |
1.0a |
a. taking R P0.2 in case of indistinct yield, otherwise R eL .
b. using P14 sample of GB/T228
B400/780DP high-strength dual-phase steel surface quality:
Grade |
Code No. |
Features |
|
Relatively high-grade |
FB(O3) |
It is allowed for the existence of a few surface defects which will not affect forming and coating & plating adhesiveness such as minor scratch, impression, pit, roll mark and oxidation tint. |
|
High-grade finishing |
FC(O4) |
One side of relatively good quality is free from any remarkable defect visible and the other side must reach FB requirements at least. |