DIN 2391 St35,St45,St52 Seamless Precision steel Tubes
Application
Machinery, Automobiles and Other machine parts.
Size Range
O.D 12.7-140mm
W.T 1.2-14mm
Length: 3-12M or according to your requirements
|
Standead |
Grade |
Chemical Composition% |
||||
|
C |
Mn |
P |
S |
Si |
||
|
DIN 2391 |
St35 |
≤0.17 |
≤0.40 |
≤0.05 |
≤0.05 |
≤0.35 |
|
St45 |
≤0.21 |
≤0.40 |
≤0.05 |
≤0.05 |
≤0.35 |
|
|
St52 |
≤0.22 |
≤1.60 |
≤0.05 |
≤0.05 |
≤0.55 |
|
|
Standead |
Grade |
Mechanical Properties |
||
|
Tensile Strength(Mpa) |
Yield Strength(Mpa) |
Elongation(%) |
||
|
DIN 2391 |
St35 |
340~470 |
≥235 |
≥42 |
|
St45 |
440~570 |
≥255 |
≥32 |
|
|
St52 |
490~630 |
≥350 |
≥44 |
|
Delivery Condition
|
Designation |
Symbol |
Description |
|
Cold finished (hard) |
BK |
Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation. |
|
Cold finished (soft) |
BKW |
The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming (e.g. bending, expanding). |
|
Cold finished and stress-relieved |
BKS |
Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree. |
|
Annealed |
GBK |
The last cold forming process is followed by annealing in a controlled atmosphere. |
|
Normalized |
NBK |
The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere. |
Chemical Composition,Mechanical Properties,Visual appearance and dimensions Test,NDT,Grain Size Test.
Oil-dip,varnish,Shot Blasting
