The DIN 2391 standard specifies seamless steel pipes for mechanical and automotive applications. DIN 2391 seamless steel pipe has high precision, good surface quality, good straightness and excellent economy. Therefore, DIN 2391 seamless steel pipe is widely used in the assembly of anatomical parts and mechanical parts. In addition, manufacturing DIN 2391 cold-drawn steel pipes can improve material utilization, save materials and processing hours, and simplify the manufacturing process. Today, let’s explore further DIN 2391 cold drawn seamless steel pipe.
Features of DIN 2391 Cold Drawn Seamless Steel Pipe:
– Precisely customized outer and inner diameters
– Tight tolerances for reduced machining time/dimensional accuracy
– Smooth and clean outer and inner diameter surfaces
– Excellent processing properties
– A wider range of physical properties available through process and annealing options
Chemical Composition (%) of DIN 2391 Cold Drawn Seamless Steel Pipe:
|
Standard |
Grade |
Chemical Components (%) |
|||||
|
Symbol |
Material No. |
C |
Si |
Mn |
P |
S |
|
|
DIN2391 |
St 30 Si |
1.0211 |
≤0.10 |
≤0.10 |
≤0.55 |
≤0.025 |
≤0.025 |
|
St 30 Al |
1.0212 |
≤0.10 |
≤0.05 |
≤0.55 |
≤0.025 |
≤0.025 |
|
|
St 35 |
1.0308 |
≤0.17 |
≤0.35 |
≥0.40 |
≤0.025 |
≤0.025 |
|
|
St 5 |
1.0408 |
≤0.21 |
≤0.35 |
≥0.40 |
≤0.025 |
≤0.025 |
|
|
St 52 |
1.058 |
≤0.22 |
≤0.55 |
≤1.60 |
≤0.025 |
≤0.025 |
|
Mechanical Properties of DIN 2391 Cold Drawn Seamless Steel Pipe:
|
Steel Grade |
Minimum values for the delivery condition |
||||||||||||
|
Steel Name |
Steel Number |
BK |
BKW |
BKS |
GBK |
NBK |
|||||||
|
Rm |
A % |
Rm |
A % |
Rm |
ReH |
A % |
Rm |
A % |
Rm |
ReH |
A % |
||
|
Mpa |
Mpa |
Mpa |
Mpa |
Mpa |
Mpa |
Mpa |
|||||||
|
St 30 Si |
1.0211 |
430 |
8 |
380 |
12 |
380 |
280 |
16 |
280 |
30 |
290 to 420 |
215 |
30 |
|
St 30 Al |
1.0212 |
430 |
8 |
380 |
12 |
380 |
280 |
16 |
280 |
30 |
290 to 420 |
215 |
30 |
|
St 35 |
1.0308 |
480 |
6 |
420 |
10 |
420 |
315 |
14 |
315 |
25 |
340 to 470 |
235 |
25 |
|
St 45 |
1.0408 |
580 |
5 |
520 |
8 |
520 |
375 |
12 |
390 |
21 |
440 to 570 |
255 |
21 |
|
St 52 |
1.0580 |
640 |
4 |
580 |
7 |
580 |
420 |
10 |
490 |
22 |
490 to 630 |
355 |
22 |
Inspection and Test List for DIN 2391 Cold Drawn Seamless Steel Pipe:
|
Inspection or test types |
Test frequency |
|
|
Internal test |
Acceptance test |
|
|
Chemical analysis |
M |
M |
|
Tensile testing |
M |
One per tested batch |
|
Flattening test or extension test |
M |
Two per tested batch |
|
Dimension verification |
M |
M |
|
Visual inspection |
M |
M |
|
NDT in order to identify leaks |
Individual |
Individual |
Marking of DIN 2391 Cold Drawn Seamless Steel Pipe:
Bale weight – up to 5000 kg as per customer requirement.
Pipes are supplied in round bundles or hexagonal bundles bound with steel straps.
Each pack comes with three labels.
Packing of DIN 2391 Cold Drawn Seamless Steel Pipe:
Packed in wooden box or bundles protected with plastic paper, and suitably protected for sea-worthily delivery or as requested.
The tubes shall be delivered with a temporary corrosion protection. The type of protection shall be at the discretion of the manufacturer.
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
