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| Place of Origin | CHANGZHOU, CHINA |
| Brand Name | Joyruns |
| Certification | ISO9000 |
| Model Number | EN10305-1 Mechanical steel Tube |
E235+NBK EN10305-1 Cold drawing Seamless Precision Steel Tube for Auto industry
EN10305-1 Seamless Precision steel tubes Used in hydraulic & pneumatic cylinder, automobile and other mechanical devices. Feature: high precision and high brightness, the inner and outer surface of the tubes have high cleanness without oxid, mechanical properties of the final tubes also come out excellent, promising no leakage under high pressure, no deformation after cold-bent and no cracks when flaring and flattening, ensuring the efficient operation in all service.
Delivery status: BK(+C), BKS(+SR), BKW(+LC), GBK(+A), NBK(+N)
Chemical composition(%) of EN 10305-1
|
Steel grade |
Steel |
C(% max) |
Si(% max) |
Mn(% max) |
P(% max) |
S(% max) |
|
E215 |
1.0212 |
0.10 |
0.05 |
0.70 |
0.025 |
0.015 |
|
E235 |
1.0308 |
0.17 |
0.35 |
1.20 |
0.025 |
0.015 |
|
E355 |
1.0580 |
0.22 |
0.55 |
1.60 |
0.025 |
0.015 |
Mechanical and technological properties of EN 10305-1
| Yield strength (min Mpa) |
Tensile strength (min Mpa) |
Elongation (min %) |
| 215 | 290-430 | 30 |
| 235 | 340-480 | 25 |
| 355 | 490-630 | 22 |
Condition on delivery of EN 10305-1:
|
Term |
Symbol |
Explanation |
|
Cold-finished/hard |
BK |
No heat treatment after the last cold-forming process. The tubes, therefore, have only low deformability. |
|
Cold-finished/soft |
BKW |
After the last heat treatment, there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits. |
|
Annealed |
GBK |
After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum. |
|
Normalized |
NBK |
The tubes are annealed above the upper transformation point in a controlled atmosphere or under a vacuum. |
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