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| Place of Origin | CHANGZHOU, CHINA |
| Brand Name | Joyruns |
| Certification | ISO9000 |
| Model Number | EN10305-1 Mechanical steel Tube |
Bright annealed / NBK Precision Seamless Steel Tube according to DIN 2391 / EN 10305-1 / EN10305-4
Main Features:
High accuracy, excellent brightness, free of rust, no oxide layer, no cracks and other defects, high inside wall cleanness. And the high-pressure carbon steel tubes are able to stand high pressure, No deformation after cold bending, no cracking after flaring and flattening. The complicated geometrical forming and machining can be realized.
▪ Main Application:
Precision tubes for hydraulic systems, automobiles, Diesel Engines, machinery, and other areas which require high precision, cleanness, and high mechanical properties performance.
▪ Standard:
DIN 2391, EN 10305-1, EN 10305-4
▪ Materials:
ST35, ST37.4, ST37, ST45, ST52, ST52.4, E235, E255, E355.
▪ Delivery condition:
NBK, bright anaerobic normalizing.
EN 10305-1 Chemical composition(%)
|
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 |
EN 10305-1 Mechanical and technological properties
| 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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