• DIN 2391 St52 cold finished seamless precision steel tubes

DIN 2391 specifies technical delivery conditions for cold fine seamless steel tubes of the dimensions listed in DIN 2391 part 1, including the steel grade of St30Si(1.0211), St30Al(1.0212), St35(1.0308), St45(1.0408), St52(1.0580), etc. This type of tube is mainly used in the occasions where dimensional accuracy, a small wall thickness,a paticular  special surface conditions and specific mechanical properties are required.


Standard DIN 2391
Steel Grade/Material St30Si(1.0211), St30Al(1.0212), St35(1.0308), St45(1.0408), St52(1.0580)
Outer Diameter(OD) 1 1/2”-28”(38mm-720mm)
Wall Thickness(WT) 2.6mm-60mm
Length 5.8-12m or OEM
End PE or BE
Packing Plastic cap or bundling
Section Shape Round
Technique Seamless cold rolled
Application Precision steel tubes
Sour service No
Place of Origin China
MOQ 25 ton
Transportation 1.Sea port:Tianjin Xingang port,Qingdao port,Shanghai Luojing port
→America,Europe,Africa,Middle East,India, Pakistan,Japan,Korea,

2.Land port:Alataw pass port
Khorgos port
→East Asia, Uzbekistan,Kazakhstan,Kyrgyzstan…(Train)
Erlianhot port→Mongolia(Train and Truck)
Manchuria port→Russia(Train and Truck)

Chemical Composition
C Si Mn P S
≤0.22 ≤0.55 ≤1.60 ≤0.025 ≤0.025
Mechanical Properties
Tensile Strength,


Yield Strength,




Delivery Condition
640 4 BK
580 7 BKW
580 420 10 BKS
490 22 GBK
490-630 335 22 NBK

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