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DIN2391 Seamless Steel Tube Black Phosphated With Good Mechanical Performance
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|Type||Welded Or Seamless||Processing||Cold Drawn, Cold Rolled|
precision steel pipe,
erw precision tubes
DIN2391 Cold Drawn Precision Steel Tube Black Phosphated Welded Hydraulic Steel Tubes
The tubes can be produced in the following delivery conditions:
GBK (+A) Annealed.
After the final cold forming process the tubes are annealed in a controlled atmosphere.
NBK (+N) Normalized. (Mainly focus on)
After the final cold forming process the tubes are annealed above the upper transformation point.
BK (+C) Cold finished/hard (cold finished as drawn).
No heat treatment after the last cold forming process.
BKW (+LC) Cold finished/soft (lightly cold worked)
After the last heat treatment there is a light finishing pass (cold drawing).
BKS (+SR) Cold finished/stress relieve annealed.
After the final cold forming process the tubes are stress relieve annealed.
|Process||Diameter||Length||Precision||Inner Hole Roughness|
|Cold Rolled||30-100mm||≤12 m||H8-H10||0.4-1.6|
|Cold Draw||30-250mm||≤12 m||H8-H10||0.8-1.6|
Steel Tube are manufactured according to technical specification of EN10305-2 Cold Drawn Welded
Precision Steel Tubes DOM tubing, with steel grade of E155,E195,E235,E275,E355 and delivery
conditions of +C +LC +SR +A +N