 |
Standard: DIN 2391 Steel grade: ST35, ST37, ST37.4, ST45, ST52, ST52.4 Size: OD (4-190mm) x WT (0.5-15mm) Delivery condition: NBK (+N), GBK (+A), BK (+C), BKW (+LC), BKS (+SR). Application: Used in hydraulic system, automobile, locomotive and military industry. |
Dimension Tolerance:
|
OD Tolerance |
4-30mm |
31-40mm |
41-50mm |
51-60mm |
61-70mm |
71-80mm |
81-90mm |
91-100mm |
|
±0.08mm |
±0.15mm |
±0.20mm |
±0.25mm |
±0.30mm |
±0.30mm |
±0.40mm |
±0.45mm |
|
|
WT Tolerance |
±10% |
|||||||
Chemical Composition:
|
Chemical Composition |
||||||
|
Standard |
Grade |
C |
Si |
Mn |
P max |
S max |
|
DIN2391-94 |
St35 |
≤0.17 |
≤0.35 |
≥0.4 |
0.025 |
0.025 |
|
DIN 1630 |
St37.4 |
≤0.17 |
≤0.35 |
≥0.35 |
0.04 |
0.04 |
|
DIN2391-94 |
St45 |
≤0.21 |
≤0.35 |
≥0.4 |
0.025 |
0.025 |
|
DIN2391-94 |
St52 |
≤0.22 |
≤0.55 |
≤1.6 |
0.025 |
0.025 |
|
DIN 1630 |
St52.4 |
≤0.22 |
≤0.55 |
≤1.6 |
0.04 |
0.035 |
Mechanical Properties:
|
|
Cold drawn(Mandatory) |
Cold drawn(Soft) |
Cold Drawn and Stress Release |
Anneal |
Normalizing |
|||||||
|
BK1） |
BKW1） |
(BKS) |
(GBK)1） |
(NBK)1） |
||||||||
|
Grade |
Tensile |
Elon gation |
Tensile |
Elon gation |
Tensile |
Yield point |
Elon gation |
Tensile |
Elon gation |
Tensile |
Yield point |
Elon gation |
|
N/mm2 |
% |
N/mm2 |
% |
N/mm2 |
N/mm2 |
% |
N/mm2 |
% |
N/mm2 |
N/mm2 |
% |
|
|
St35 |
480 |
6 |
420 |
10 |
420 |
315 |
14 |
315 |
35 |
340~470 |
235 |
25 |
|
St37.4 |
480 |
6 |
420 |
10 |
420 |
315 |
14 |
315 |
25 |
350~480 |
235 |
25 |
|
St45 |
580 |
5 |
520 |
8 |
520 |
375 |
12 |
390 |
21 |
440~570 |
255 |
21 |
|
St52 |
640 |
4 |
580 |
7 |
580 |
420 |
10 |
490 |
22 |
490~630 |
355 |
22 |
|
St52.4 |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
500~650 |
355 |
21 |