• Model NO.：KM-310
• Size：1,2"--24"
• Delivery Time：20-35 Days Ex Mill
• Loading Port：Chinese Main Port
• Certificate：API,ISO,SGS,BV,etc
• MOQ：5 Tons
• Surface：Black Painting,Varnish Paint,Anti-Rust Oil
• Wt Tolerance：+1%~-1%
• Od Tolerance：+1%~-1%
• Process Method：Hot Rolled,Cold Drawn
• Length：1~12metre
• Transport Package：Export Standard Sea-Worthy Packing
• Specification：according to the requirment
• Trademark：KINGMETAL
• Origin：China
• Production Capacity：500 Tons,Month

DIN2391, EN10305, ASTM A519, GB/T 8713 etc.

Material

C45C, 27SiMn,ST52, E355, E355SR, STKM13C, 27SiMn SAE1020, C20 Q235B, CK45, etc.

Heat treatment

BK+S condition

Specification

Outer diameter(mm)                               

Inner diameter(mm)                               

50-377

40-320

I.D Tolerance

H8~H9

Length

3-9 Mtr (Suggested length 3-5.8 Mtr suitable for 20' container)

Straightness

0.3/1000

ID roughness

RA 0.4 micron(max)

Technology

Honing / Cold Drawn / Boring and Rolling

Scope

Honed tube for hydraulic cylinder, crane, injection machine and 

construction machine application

 

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:

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

Mechanical Properties

Mechanical properties at room temperatureSteel GradeMinimum values for the delivery conditionSteel NameSteel NumberBKBKWBKSGBKNBKRmA %RmA %RmReHA %RmA %RmReHA %MpaMpaMpaMpaMpaMpaMpaSt 521.0580640458075804201049022490 to 63035522

Inspection and test list for the DIN 2391 Standard

Inspection or test typesTest frequencyInternal testAcceptance testChemical analysisMMTensile testingMOne per tested batchFlattening test or extension testMTwo per tested batchDimension verificationMMVisual inspectionMMNDT in order to identify leaksIndividualIndividual

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