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DIN2391 NBK Tube|DIN2391 Bright Tube
DIN2391 High-Precision Cold-Drawn Bright Precision Seamless Steel Tube is a specialized steel tube used in hydraulic systems and the automotive industry.
Description
DIN2391 High-Precision Cold-Drawn Bright Precision Seamless Steel Tube
DIN2391 High-Precision Cold-Drawn Bright Precision Seamless Steel Tube is a specialized type of steel tubing manufactured using a precise cold-drawing process to achieve tight dimensional tolerances and a smooth, shiny surface finish. These seamless tubes are engineered to exact specifications, making them ideal for critical applications such as automotive components, hydraulic systems, and precision machinery, where accuracy, reliability, and resistance to corrosion are essential.
How to Process Introduction of DIN2391 High-Precision Cold-Drawn Bright Precision Seamless Steel Tube:
The process introduction of DIN2391 High-Precision Cold-Drawn Bright Precision Seamless Steel Tube, particularly denoted as "NBK" (which stands for "Normalizing, Bright Annealing, Cold Drawn"), entails the following steps:
1. Material Selection:
- High-quality raw materials, typically carbon steel, alloy steel, or stainless steel, are carefully chosen based on the specific requirements of the application.
2. Cold Drawing:
- The selected material undergoes cold drawing, a process where it is pulled through dies to reduce its diameter and achieve precise outer and inner dimensions.
- This cold working process ensures tight tolerances and a smooth surface finish.
3. Normalizing:
- The tubes may undergo a normalizing process, where they are heated to a temperature above the transformation range, held at that temperature for a specified period, and then cooled in still air.
- Normalizing helps refine the grain structure of the steel, improve its mechanical properties, and relieve internal stresses.
4. Bright Annealing:
- After normalizing (if performed), the tubes are subjected to bright annealing, involving heating in a controlled atmosphere to a specific temperature.
- This process eliminates any remaining internal stresses, improves ductility, and creates a bright, oxide-free surface finish.
- Rapid cooling follows to retain the desired microstructure and surface characteristics.
5. Cutting and Finishing:
- The annealed tubes are cut to the required lengths and subjected to additional finishing processes such as deburring or polishing to achieve the desired surface smoothness and cleanliness.
6. Quality Control:
- Throughout the manufacturing process, stringent quality control measures are implemented to ensure that the finished tubes meet the specified dimensional tolerances, surface finish requirements, and mechanical properties.
- Non-destructive testing, dimensional inspection, and chemical analysis are commonly performed to verify quality.
7. Packaging and Delivery:
- The finished tubes are carefully packaged to protect them during transportation and storage.
- They are then delivered to customers for use in various precision engineering applications.
The NBK process for DIN2391 High-Precision Cold-Drawn Bright Precision Seamless Steel Tubes combines precise cold drawing with normalization and bright annealing to achieve exceptional dimensional accuracy, surface finish, and mechanical properties, making them suitable for critical applications where reliability and performance are paramount.
Main Features of DIN2391 High-Precision Cold-Drawn Bright Precision Seamless Steel Tube:
High precision, good surface finish, no oxidation layer on the inner and outer walls after heat treatment, excellent inner wall cleanliness, high pressure resistance, no deformation during cold bending, no cracks during expansion or flattening, suitable for various complex shaping and mechanical processing. Tube color: light gray with white.
Main Uses of DIN2391 High-Precision Cold-Drawn Bright Precision Seamless Steel Tube:
Steel tubes used in hydraulic systems, automotive steel tubes, and for customers with high requirements for tube precision, surface finish, cleanliness, and mechanical performance, including non-standard mechanical hydraulic systems, hydraulic steel tubes for automotive test equipment, seamless steel tubes for sanitation vehicles hydraulic systems, precision steel tubes for high-altitude work equipments hydraulic systems, and precision hydraulic seamless steel tubes for shield tunneling machines.
DIN2391 High-Precision Cold-Drawn Bright Precision Seamless Steel Tube Specifications:
- Main specifications of DIN2391 High-Precision Cold-Drawn Bright Precision Seamless Steel Tube:
|
Outer Diameter (mm) |
Wall Thickness (mm) |
Tolerance (mm) |
|
4 |
0.5 - 1 |
±0.05 |
|
6 |
0.5 - 1 |
±0.05 |
|
8 |
0.5 - 1 |
±0.05 |
|
10 |
0.5 - 1.5 |
±0.05 |
|
12 |
0.5 - 1.5 |
±0.05 |
|
14 |
0.5 - 1.5 |
±0.05 |
|
16 |
0.5 - 2 |
±0.08 |
|
18 |
0.5 - 2 |
±0.08 |
|
20 |
0.5 - 2 |
±0.08 |
|
25 |
0.5 - 2 |
±0.10 |
|
30 |
0.5 - 2 |
±0.10 |
|
35 |
0.5 - 2 |
±0.10 |
|
40 |
0.5 - 2.5 |
±0.15 |
|
45 |
0.5 - 2.5 |
±0.15 |
|
50 |
0.5 - 2.5 |
±0.15 |
|
55 |
0.5 - 2.5 |
±0.15 |
|
60 |
0.5 - 2.5 |
±0.15 |
|
65 |
0.5 - 2.5 |
±0.15 |
|
70 |
0.5 - 2.5 |
±0.15 |
- Standards for High-Precision Cold-Drawn Bright Precision Seamless Steel Tube:
|
Standard |
Description |
|
DIN 2391 |
German standard for seamless precision steel tubes |
|
EN 10305-1 |
European standard for steel tubes for precision applications |
|
ASTM A519 |
American standard for seamless carbon and alloy steel tubes |
|
JIS G3445 |
Japanese standard for carbon steel tubes for machine structural purposes |
|
GB/T 3639-2000 |
Chinese standard for seamless cold-drawn or cold-rolled steel tubes for precision applications |
|
ISO 8535-1 |
International Organization for Standardization standard for steel tubes for high-pressure fuel injection pipes - Part 1: Requirements for seamless cold-drawn single-wall tubes |
|
BS EN 10305-4 |
British standard for steel tubes for precision applications - Technical delivery conditions - Part 4: Seamless cold drawn tubes for hydraulic and pneumatic power systems |
- Materials for DIN2391 High-Precision Cold-Drawn Bright Precision Seamless Steel Tube:
|
Material Grade |
Description |
Applications |
|
St35, St45, St52 |
Carbon steel grades specified in DIN 2391 |
Automotive components, hydraulic systems |
|
E235, E355 |
Carbon steel grades specified in EN 10305-1 |
Hydraulic and pneumatic systems, precision machinery |
|
1010, 1020, 1045 |
Carbon steel grades specified in ASTM A519 |
Machinery components, automotive parts |
|
S10C, S20C, S45C |
Carbon steel grades specified in JIS G3445 |
Machine structural purposes, automotive parts |
|
20#, 45#, 25CrMo4 |
Carbon and alloy steel grades specified in GB/T 3639-2000 |
Automotive parts, mechanical engineering |
|
SUS304, SUS316 |
Austenitic stainless steel grades |
Instrumentation, medical devices |
|
1.4301, 1.4401 |
Austenitic stainless steel grades specified in EN 10305-1 |
Precision engineering, food processing |
- Delivery condition for DIN2391 High-Precision Cold-Drawn Bright Precision Seamless Steel Tube:
|
Delivery Condition |
Description |
|
NBK |
Normalized, Bright Annealed, Cold Drawn - Tubes are normalized, bright annealed, and cold drawn. This condition ensures uniform properties, precise dimensions, and a smooth, shiny surface finish. |
- Length of DIN2391 High-Precision Cold-Drawn Bright Precision Seamless Steel Tube:
5800mm, 6000mm.
- Packaging for DIN2391 High-Precision Cold-Drawn Bright Precision Seamless Steel Tube:
Bundle packaging or wooden box packaging.
- Surface rust prevention treatment for DIN2391 High-Precision Cold-Drawn Bright Precision Seamless Steel Tube:
Inner and outer surfaces are rinsed with rust-proof oil. High precision, good surface finish, no oxidation layer, no cracks, folding, rolling, scars, delamination, embossing, and other defects. Surface cleanliness: Clean, free from iron chips and dust, extending the service life of hydraulic systems.
- Mechanical properties of DIN2391 High-Precision Cold-Drawn Bright Precision Seamless Steel Tube:
|
Material Grade |
Tensile Strength (MPa) |
Yield Strength (MPa) |
Elongation (%) |
Hardness (HV) |
|
St35 |
≥ 480 |
≥ 315 |
≥ 25 |
≤ 160 |
|
St45 |
≥ 580 |
≥ 420 |
≥ 15 |
≤ 170 |
|
St52 |
≥ 600 |
≥ 520 |
≥ 14 |
≤ 190 |
|
E235 |
≥ 490 |
≥ 355 |
≥ 25 |
- |
|
E355 |
≥ 640 |
≥ 490 |
≥ 22 |
- |
|
1010 |
≥ 315 |
≥ 205 |
≥ 20 |
- |
|
1020 |
≥ 420 |
≥ 275 |
≥ 15 |
- |
|
1045 |
≥ 630 |
≥ 540 |
≥ 12 |
- |
|
SUS304 |
≥ 520 |
≥ 205 |
≥ 40 |
≤ 200 |
|
SUS316 |
≥ 520 |
≥ 205 |
≥ 40 |
≤ 200 |
DIN2391 Cold-Drawn Bright Seamless Steel Tube
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