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Related products : B170P1 steel , B220P2 steel , B210P1 steel
B250P1 high-strength phosphor steel plate refers to low carbon or ultra-low
carbon steel especially added with certain amount of phosphor, which increases steel strength by its solid solution strengthening function. Adoption of such plates may properly reduce thickness of automotive drawn parts thus lighten automobile dead weight.
B250P1 high-strength phosphor steel plate chemical composition:
Steel grade |
Chemical composition |
|||||
|
C |
Mn |
P |
S |
Alt |
Ti a |
|
|
B250P1 |
≤0.008 |
≤1.20 |
≤0.12 |
≤0.025 |
≥0.015 |
≤0.20 |
a: with Nb instead of Ti, but Nb and Ti total content ≤0.20
B250P1 high-strength phosphor steel plate mechanical performance:
Steel grade |
Yield |
Tensile |
After Breakage Percent Elongation |
r c, d |
n c, d |
||
|
Nominal thickness mm |
|||||||
|
0.60~<1.0 |
1.0~<1.6 |
≧1.6 |
|||||
|
B250P1 |
250~360 |
440 |
30 |
32 |
34 |
- |
- |
a. taking R P0.2 in case of indistinct yield, otherwise R eL .
b. using P14 sample of GB/T228
c. r 90 and n 90 for B210P1, r and n for B170P1, allowable reduction by 0.2 in case of thickness≥1.6mm, no guarantee for r and n in case of thickness ≥2.0mm.
d. r=(r 90 +2r 45 +r 0 )/4; n=(n 90 +2n 45 +n 0 )/4.
B250P1 high-strength phosphor steel plate surface quality:
Grade |
Code No. |
Features |
|
Relatively high-grade finishing surface |
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 surface |
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. |
|
Ultra high-grade finishing surface |
FD(O5) |
One side of relatively good quality is free from any defect, namely appearance quality after painting or electrogalvanizing is no affected, and the other side must reach FB requirements at least. |
It is guaranteed that no tensile strain mark occurs on B250P1 high-strength phosphor steel plates and strips at their application in case of room temperature storage.