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Standard for seamless precision steel tubes.
Application:
Cold drawn or cold rolled precision seamless steel tubes for hydraulic pressure and pneumatic services.
For Auto. use,machinery use,oil cylinder tube,motorcycle shock reducer use,auto shock reducer inner cylinder,etc.
Details
Size:
O.D.: 6.0-650.0mm W.T.: 1.0-65mm Length: Max.12000mm
Steel Grade and Chemical Composition(%)
| Standard |
Grade |
C≤ |
Si≤ |
Mn |
P≤ |
S≤ |
| DIN2391 |
St35 |
0.18 |
0.35 |
≥0.40 |
0.025 |
0.025 |
| St45 |
0.22 |
0.10-0.35 |
≥0.40 |
0.025 |
0.025 |
| St52 |
0.22 |
0.55 |
≤1.60 |
0.025 |
0.025 |
Mechanical Properties
Rm:Tensile Strength(Mpa) ReH:Yield Point(Mpa) A%:Elongation Mpa=N/mm2
| Standard |
Grade |
BK |
BKW |
BKS |
GBK |
NBK |
| Rm≥ |
A%≥ |
Rm≥ |
A%≥ |
Rm≥ |
ReH≥ |
A%≥ |
Rm≥ |
A%≥ |
Rm≥ |
ReH≥ |
A%≥ |
| DIN2391 |
St35 |
480 |
6 |
420 |
10 |
420 |
315 |
14 |
315 |
25 |
340-470 |
235 |
25 |
| St45 |
580 |
5 |
520 |
8 |
520 |
375 |
12 |
390 |
21 |
440-570 |
235 |
21 |
| St52 |
640 |
4 |
580 |
7 |
580 |
420 |
10 |
490 |
22 |
490-630 |
355 |
22 |
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