Bright Annealed NBK Seamless Precision Steel Tube DIN 2391 EN 10305-1 with 215-355 MPa Yield Strength
Price:
Negotiable
MOQ:
2TONs
Delivery Time:
30DAYS
Brand:
Joyruns
Product Description
Product Overview
Bright annealed NBK seamless precision steel tubes manufactured according to DIN 2391 and EN 10305-1/EN 10305-4 standards, designed for applications requiring exceptional precision and mechanical performance.
Key Features
- High dimensional accuracy and excellent surface brightness
- Free of rust, oxide layers, cracks, and other surface defects
- Exceptional internal wall cleanness for hydraulic applications
- High-pressure resistance with no deformation after cold bending
- No cracking after flaring and flattening tests
- Suitable for complex geometrical forming and machining operations
Applications
Precision tubes for hydraulic systems, automotive components, diesel engines, machinery, and other industrial applications demanding high precision, cleanliness, and superior mechanical properties.
Technical Specifications
Standards Compliance
DIN 2391, EN 10305-1, EN 10305-4
Available Materials
ST35, ST37.4, ST37, ST45, ST52, ST52.4, E215, E235, E255, E355
Delivery Condition
NBK (bright anaerobic normalizing)
Chemical Composition (%) - EN 10305-1
| Steel Grade | Steel Number | 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 & Technological Properties - 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 |
Delivery Conditions - EN 10305-1
| Term | Symbol | Explanation |
|---|---|---|
| Cold-finished/hard | BK | No heat treatment after last cold-forming process; low deformability |
| Cold-finished/soft | BKW | Light finishing pass after heat treatment; suitable for cold-forming within limits |
| Annealed | GBK | Annealed in controlled atmosphere or vacuum after final cold-forming |
| Normalized | NBK | Annealed above upper transformation point in controlled atmosphere or vacuum |
Product Images
Similar Products
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.
Company
Changzhou Joyruns Steel Tube CO.,LTD
Location
No.143 Qingyang North road,Tianning district. Changzhou
Contact Person
Lee