Project Description

DIN 2391-1 Cold Drawn Seamless Precision Tubes

EN10305-4 Seamless Precision Tubes
DIN 2391 / EN 10305-4
Cold drawn or cold rolled precision seamless steel tubes.
Inside precision seamless tubes for hydraulic pressure and pneumatic services.

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DIN 2391/EN10305-4 Seamless Precision Tubes Applications

Used in Hydraulic & Pneumatic Cylinder, Mechanical and Automotive Engineering, for Auto use; for Machinery use. Oil cylinder Tube, motorcycle shock reducer steel tubes, and auto shock reducer inner cylinder.

Click to download the details of DIN2391-1 EN10305-4 Cold Drawn Steel Tubes.

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Chemical Composition

DIN 2391

StandardGradeChemical Components (%)
SymbolMaterial No.CSiMnPS
DIN2391St 351.0308≤0.17≤0.35≥0.40≤0.025≤0.025
St 451.0408≤0.21≤0.35≥0.40≤0.025≤0.025
St 521.058≤0.22≤0.55≤1.60≤0.025≤0.025

EN10305-4

Steel GradeChemical Components (%)
Steel NameSteel NumberC
max.
Si
max.
Mn
max.
P
max.
S
max.
AL
min.
E2151.02120.100.050.70.0250.0250.025
E2351.03080.170.351.20.0250.025/
E3551.0580.220.551.60.0250.025/

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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.

Mechanical Properties

DIN 2391

Mechanical properties at room temperature
Steel GradeMinimum values for the delivery condition
Steel NameSteel NumberBKBKWBKSGBKNBK
RmA %RmA %RmReHA %RmA %RmReHA %
MpaMpaMpaMpaMpaMpaMpa
St 351.03084806420104203151431525340 to 47023525
St 451.0408580552085203751239021440 to 57025521
St 521.0580640458075804201049022490 to 63035522

EN10305-4

Mechanical properties at room temperature
Steel GradeMinimum values for the delivery condition
Steel NameSteel Number+C+LC+SR+A+N
Rm
Mpa
A %Rm
Mpa
A %Rm
Mpa
ReH
Mpa
A %Rm
Mpa
A %Rm
Mpa
ReH
Mpa
A %
E2151.02124308380123802801628030290 to 4302530
E2351.03084806420104203501631525340 to 48023525
E3551.0580640458075804501045022490 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 EN 10305-4

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, EN10305-4 seamless tubes, E235 precision steel tubes, E215 precision steel tubes, E335 precision tubes, EN10305 Cold drawn seamless tubes.

Size:

OD.: 4mm-89mm

W.T.: 0.6mm-20mm

Shape: Round

Production type: Cold drawn or cold rolled

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

Grade:  St35, ST45, ST52, E235, E215, E355

Note:

  • Mill test certificates will be issued according to EN10204.3
  • The tubes Shall be Seamless cold drawn or cold rolled.
  • The manufacture should have TS16949 certificate or ISO9000 certificate.

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

Application:

apply to the Precision steel tubes used.

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Photos for DIN2391 EN10305-4 cold drawn seamless precision tubes

DIN2391 4 1 Precision Steel Tubes

DIN2391 4 1 Precision Steel Tubes

EN10305-4 Cold Drawn Steel Tubes

EN10305-4 Cold Drawn Steel Tubes

Bright Annealing Precision Steel Tubes

Bright Annealing Precision Steel Tubes

Precision Tubes Package by Ply Wooden Box

Precision Tubes Package by Ply Wooden Box

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