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DIN2391

The standard of DIN2391 defines the technical delivery conditions for seamless steel pipes according to DIN2319 which are made from steel grades. Besides, DIN2319 seamless precision tubes have strict dimensional tolerances, good surface and special mechanical properties. The DIN2391 ST35 is a carbon steel which is easy to weld and cut.

DIN2391 Precision Steel Pipe

DIN2391precision steel pipe

Heat treatment makes DIN2391 pipes easy to process such as bending, cutting and flaring etc. In accordance with DIN2391 standard, delivery lengths are permitted between 4-7m. The majority of steel pipes in stock are in 5-7m lengths.

Chemical Composition(%):

Steel Grade Chemical Analysis (%)
Grade Material NO. C max. Si max. Mn P max. S max.
St 30 Si 1.0211 0.1 0.3 ≤0.55 0.025 0.025
St 30 Al 1.0212 0.1 0.05 ≤0.55 0.025 0.025
St 35 1.0305 0.17 0.35 ≥0.40 0.025 0.025
St 45 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
Can join the alloy elements: Nb:≤0.03%;Ti:≤0.03%;V:≤0.05%;Nb+Ti+V:≤0.05%

Mechanical Properties:

Steel grade BK BKW BKS GBK NSK
Grade Material NO. RmN/mm
min
min RmN/mm
min
min N/mm
min
ReH
N/mm
min
min N/mm
min
min N/mm
min
ReH
N/mm
min
min
St 30 Si 1.0211 430 8 380 12 380 280 15 280 30 290-420 215 30
St 30 Al 1.0212 430 8 380 12 380 280 15 280 30 290-420 215 30
St 35 1.0305 480 6 420 10 420 315 14 315 25 340-470 235 25
St 45 1.0408 580 5 520 8 520 375 12 390 21 440-570 255 21
St 52 1.058 640 4 580 7 580 420 10 490 22 490-630 355 22
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