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DIN2391 ST52 EN10305 E355 Honed Hydraulic Cylinder Pipes

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DIN2391 Part 2 Specifies dimensions for cold finished, seamless precision steel tubes and is to be used in conjunction with DIN2391 part2 which states the relevant technical delivery conditions. The preferred sizes listed in standard are mainly used in mechanical and automotive engineering.

Where steel tubes of dimensions specified in this standard are to comply with the technical delivery conditions listed in sub clause 1.2 of DIN 2391 Part 2.

DIN 2391 seamless precision tubes applications —Used in Hydraulic & pneumatic cylinder, Mechanical and Automotive engineering.

Chemical Composition:

StandardGradeChemical Components (%)
SymbolMaterial No.CSiMnPS
DIN2391St 521.058≤0.22≤0.55≤1.60≤0.025≤0.025

Delivery Conditions

The tubes shall be manufactured from cold drawn or cold rolled processes. The tubes shall be supplied in one of the delivery conditions as follows:

DesignationSymbolDescription
Cold finished (hard)BKTubes do not undergo heat treatment following the final cold forming and thus, have a rather high resistance to deformation.
Cold finished (soft)BKWThe 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-relievedBKSHeat 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.
AnnealedGBKThe last cold forming process is followed by annealing in a controlled atmosphere.
NormalizedNBKThe last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere.

Delivery Condition Symbol in accordance with EN10305 and DIN2391

Symbol in accordance with EN 10305 Symbol in accordance with DIN2391
+CBK
+LCBKW
+SRBKS
+AGBK
+NNBK

Mechanical Properties

Mechanical properties at room temperature
Steel GradeMinimum values for the delivery condition
Steel NameSteel NumberBKBKWBKSGBKNBK
RmA %RmA %RmReHA %RmA %RmReHA %
MpaMpaMpaMpaMpaMpaMpa
St 521.0580640458075804201049022490 to 63035522

Inspection and test list for the DIN 2391 Standard

Inspection or test typesTest frequency
Internal testAcceptance test
Chemical analysisMM
Tensile testingMOne per tested batch
Flattening test or extension testMTwo per tested batch
Dimension verificationMM
Visual inspectionMM
NDT in order to identify leaksIndividualIndividual

Standard: DIN 2391

Description Name: DIN 2391 Seamless cold drawn tubes, DIN 2391 Seamless precision steel tubes, ST35 Precision tubes, ST45 Precision tubes, ST52 Precision tubes, Seamless precision tubes, DIN 2391 ST35 Seamless precision steel tubes, DIN 2391 ST45 Seamless precision steel tubes, DIN 2391 ST52 Seamless precision steel tubes, ST 52 Honed tubes, ST52 cylinder tubes

Size: 50mm-350mm

W.T.: 3mm-50mm

Shape: Round

Production type: Cold drawn

Length: Single random length/ Double random length or as customer’s actual request max length is 10m

Grade: St52

Seamless cold drawn pre-honed pipes

ST52 cold drawn Pre-honed pipe
DIN2391 ST52 Seamless cold drawn pre-honed pipe OD inspection
DIN2391 ST52 Seamless cold drawn pre-honed pipe inspection
DIN2391 ST52 Seamless cold drawn pre-honed pipe Length inspection
DIN2391 ST52 Seamless cold drawn pre-honed pipe WT inspection

DIN2391 ST52 Seamless cold drawn pre-honed pipe inspection

Tolerance:

OD.: -/-1MM

ID.: -0.3/-0.7MM

Length: -0/+10mm

Note:

Mill test certificates will be issued according to EN10204.3

The tubes shall be Seamless cold drawn.

Inside surface not allowed Scarch Dent.

Seamless honed hydraulic cylinder pipe

DIN2391 ST52 Seamless Honed Pipes
DIN2391 ST52 Cold drawn honed pipes

Protection and Packing:

Packed in wooden box or bundles protected with plastic paper, and suitably protected for sea-worthily delivery or as requested.

The tubes shall be delivered with a temporary corrosion protection. The type of protection shall be at the discretion of the manufacturer.

DIN2391 ST52 Cold drawn honed pipes in wooden case
DIN2391 ST52 Cold drawn honed pipes wraped

Application:

Apply to the hydraulic cylinder and air cylinder used.

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