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Related products : BUFD steel , BSUFD steel , BUSD steel , BLC steel , BDCK battery shell steel
With drawing purpose, BLD drawing steel is guaranteed that no tensile strain mark occurs on steel plates and strips at their application within 6 months after they are produced and in case of room temperature storage.
BLD drawing steel chemical composition:
Steel grade |
Chemical composition |
|||||
|
C |
Mn |
P |
S |
Alta |
Ti b |
|
|
BLD |
≤0.08 |
≤0.45 |
≤0.030 |
≤0.025 |
≥0.020 |
- |
a: For BLD, when C≤0.01, Alt≥0.015。
b: with Nb instead of Ti, but Nb and Ti total content ≤0.20
BLD drawing steel mechanical performances:
Steel grade |
Yield |
Tensile |
After Breakage Percent Elongation |
r c, d |
n c, d |
|||
|
Nominal thickness mm |
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|
<0.60 |
0.60~<1.0 |
1.0~<1.6 |
≥1.6 |
|||||
|
BLD |
120~240 |
270 |
38 |
40 |
42 |
44 |
1.4 |
0.18 |
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 BLD, 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.
BLD drawing steel drawing steel 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. |