DIN 2391 Part 2 defines the dimensions of cold-finished seamless precision steel tubes and is used alongside DIN 2391 Part 1, which outlines the technical delivery conditions. The preferred sizes specified in the standard are primarily utilized in mechanical and automotive engineering applications.
Main Products & Steel Grades of DIN 2391 Seamless Precision Steel Tube
The standard covers seamless carbon steel tubes intended for machine structural applications, with the following steel grades:
DIN 2391-1: ST35, ST45, ST52
Applicable Standards
DIN 2391-1: Seamless Precision Steel Tubes
EN 10305-1: Steel tubes for precision applications – Technical delivery conditions – Part 1: Seamless cold-drawn tubes
Size Specifications
Outer Diameter: 4.0mm – 60.0mm
Wall Thickness: 0.5mm – 8.0mm
Length: Up to 6000mm
Applications
DIN 2391 seamless precision tubes are widely used in:
Hydraulic & Pneumatic Cylinders
Mechanical Engineering
Automotive Engineering
Packaging Options
Bare
Bundled
Crated
Custom packaging (e.g., crate protection on both tube ends) as per customer requirements.
DIN2391-1: Chemical Compositions (%)
|
Si |
Mn |
P |
S |
|
≤0.35 |
≥0.40 |
≤0.050 |
≤0.050 |
|
≤0.35 |
≥0.40 |
≤0.050 |
≤0.050 |
|
≤0.55 |
≥1.60 |
≤0.050 |
≤0.050 |
DIN2391-1: Mechanical Properties
|
Grade |
BK |
BKW |
||
|
|
RmN/mmmin |
min |
RmN/mmmin |
min |
|
ST35 |
480 |
6 |
420 |
10 |
|
ST45 |
580 |
5 |
520 |
8 |
|
ST52 |
640 |
4 |
580 |
7 |
|
Grade |
BKS |
||
|
|
N/mmmin |
ReHN/mmmin |
min |
|
ST35 |
420 |
315 |
14 |
|
ST45 |
520 |
375 |
12 |
|
ST52 |
580 |
420 |
10 |
|
Grade |
GBK |
NBK |
|||
|
|
N/mmmin |
min |
N/mmmin |
ReHN/mmmin |
min |
|
ST35 |
315 |
25 |
340-470 |
235 |
25 |
|
ST45 |
390 |
21 |
440-570 |
235 |
21 |
|
ST52 |
490 |
22 |
490-630 |
355 |
22 |
United Steel Industry As the most important steel pipe manufacturer and exporter in China, in the past 20 years, we have completed more than 100 projects, with partners in more than 100 countries, and established relationships with oil and gas and EPC companies in many countries business relationship.
For more information about the product price, catalog and rolling mill inspection certificate,
please consult:Email:Sales@usisteels.com
