St35,St45,St52

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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.


Inspections and tests performed

Chemical Composition,Mechanical Properties,Visual appearance and dimensions Test,NDT,Grain Size Test.


Surface treatment

Oil-dip,varnish,Shot Blasting




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