DIN 2391 ST 44 Seamless Precision Steel Tubes Manufacturer and Supplier in India
DIN 2391 ST 44 Cold Drawn Carbon Seamless Precision Steel Tubes are carbon steel pipes that have been drawn at a cold temperature, and they are meant to be used when there is need for very high precision, clean surfaces, and high consistency. The seamless precision tubes are manufactured according to DIN 2391 standards, which are known to possess high tensile strength and high precision among others. The uniform wall thickness and close tolerances allow for a more efficient production process but also minimize the amount of additional machining needed. Amardeep Steel is a manufacturer and supplier
of high-quality DIN 2391 ST 44 Seamless Precision Steel Tubes in various dimensions and standards that are suitable for use in demanding industrial projects around the world.
Technical Data
Specifications of DIN 2391 ST 44 Seamless Precision Steel Tubes
| Parameter | Details |
|---|---|
| Standard | DIN 2391 (Part 1: Dimensions; Part 2: Technical Delivery Conditions) |
| Grade | St44Al |
| Steel No. | 1.0212 (St30Al) / 1.0211 (St30Si) |
| Outer Diameter (OD) | 4 mm – 260 mm |
| Wall Thickness (WT) | 0.5 mm – 25 mm |
| Length | Standard random lengths (4 m – 7 m); fixed cut lengths up to 12,000 mm on request |
Chemical Compositions of DIN 2391 ST 44 Seamless Precision Steel Tubes
| Grade | Steel No. | C (%) max | Si (%) max | Mn (%) min | P (%) max | S (%) max |
|---|---|---|---|---|---|---|
| DIN 2391 St45 | 1.0408 | 0.21 | 0.35 | 0.40 | 0.025 | 0.025 |
Note: Optional micro-alloying elements permitted per standard: Nb≤0.03%, Ti≤0.03%, V≤0.05% (with Nb+Ti+V≤0.05%).
Mechanical Properties of DIN 2391 ST 44 Seamless Precision Steel Tubes
| Final Supply Condition | Condition Symbol | Tensile Strength Rm (MPa) | Yield Strength ReH (MPa min) | Elongation A5 (% min) |
|---|---|---|---|---|
| Cold Finished (Hard) | BK | 580 min | — | 5 |
| Cold Finished (Soft) | BKW | 520 min | — | 8 |
| Cold Finished & Stress Relieved | BKS | 520 min | 375 | 12 |
| Annealed | GBK | 390 min | — | 21 |
| Normalized | NBK | 440 – 570 | 255 | 21 |
Equivalent Grades of DIN 2391 ST 44 Seamless Precision Steel Tubes
| Standard | Grade / Specification | Direct Link / Notes |
|---|---|---|
| DIN 2391 | St45 (1.0408) | Primary Grade |
| EN Equivalent | EN 10305-1 E255 | Linked to general EN 10305 Precision Hub |
| GB Equivalent | GB/T 3639 Grade 20 | Chinese National Standard |
Dimension Chart of DIN 2391 ST 44 Seamless Precision Steel Tubes
For mechanical engineering, automotive components, and other precision applications, DIN 2391 ST 44 Seamless Precision Steel Tubes are manufactured in accordance with the dimensional tolerances specified in DIN 2391-1, ensuring accurate fit and consistent performance.
Outside Diameter (OD): 4 mm to 260 mm
Wall Thickness (WT): 0.5 mm to 25 mm
Applications Usage of DIN 2391 ST 44 Seamless Precision Steel Tubes
- Hydraulic & Pneumatic Cylinders
- Mechanical Engineering Components
- Automotive Engineering
- Machine Structural Parts
Frequently Asked Questions
1. What are DIN 2391 ST 44 Seamless Precision Steel Tubes?
DIN 2391 ST 44 Seamless Precision Steel Tubes are cold-drawn carbon steel tubes manufactured to DIN 2391 standards. They offer high dimensional accuracy, smooth surface finish, and reliable mechanical properties for precision engineering applications.
2. What are DIN 2391 ST 44 tubes used for?
These tubes are commonly used in hydraulic cylinders, pneumatic systems, automotive components, machine tools, industrial automation, agricultural machinery, and general engineering applications.
3. What is the equivalent grade of DIN 2391 ST 44?
The commonly accepted equivalent grades are EN 10305-1 E255 and GB/T 3639 Grade 20, although the final material selection should always be confirmed based on the project specifications and applicable standards.
4. What is the difference between DIN 2391 ST 35, ST 44, and ST 52?
The primary difference lies in their mechanical strength and chemical composition. ST35 offers the lowest strength of the three, ST45 sits in the middle with good machinability, and ST52 has the highest tensile and yield strength for the most demanding applications.
5. Are DIN 2391 ST 44 Seamless Precision Steel Tubes weldable?
Yes. Due to their controlled carbon content, DIN 2391 ST 44 tubes have good weldability and can be welded using standard welding processes when proper fabrication procedures are followed.
6. What sizes are available for DIN 2391 ST 44 Seamless Precision Steel Tubes?
DIN 2391 ST 44 tubes are typically available in outside diameters ranging from 4 mm to 260 mm with wall thicknesses from 0.5 mm to 25 mm, depending on manufacturer capabilities and project requirements.
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