Precision Seamless 40Cr ,12Cr1MoV  Steel hydraulic cylinder Tube For Automobile Cylinder

Commodity: precision cylinder steel tube
Standard specification&material: DIN2391-2 ST52,ST45,EN10305-1 E355,C45E,25CrMo4,34CrMo4,42CrMo4,ASTM A519 SAE1020,SAE1026,SAE1045,SAE4130,SAE4140,etc.
Size range:40mm*30mm - 480mm*450mm
Manufacture method: cold rolled, hydraulic cold drawn
Delivery condition: 
BK    BKW    BKS    GBK    NBK
+C    +LC    +SR    +A    +N
Internal surface treatment method: honing,skiving and roller burnishing
OD tolerance: as per EN10305-1 or DIN2391-1
ID tolerance: H7,H8,H9,H10 or given by customer.
W.T tolerance(eccentricity): +/-5%
Bore roughness(Ra): 0.25um max for skived and roller burnished tube, 0.4um max for honed tube.
Chemical composition requirement of E355 material:
Element    C    Si    Mn    P    S
Content (%)    0.22% max    0.55% max    1.60% max    0.025% max    0.025% max
Mechanical properties of E355 tubes:
     BK    BKW    BKS    GBK    NBK
Tensile strength:    640 Mpa min    580 Mpa min    580 Mpa min    450 Mpa min     490Mpa-630Mpa
Yield strength    -    -    450 Mpa min    -     355 Mpa min
Elongation    4% min    7% min    10% min    22% min     22% min

Specifications:

   Inner Diameter:  30- 1000 mm

   Outer Diameter:  40- 1200 mm

   Wall Thickness: 2.5- 55 mm

   Main Material:  20#(St45), 45#(CK45), 16Mn(St52), 25Mn, 27SiMn

   Standard: GB/T8713-88, ISO4394/1-1980(E)

   (Can be customerized according to your needs.)

service:

External machining or external polishing service can be provided.  

End machining service can be provided.

Products pictures:

Equipments:

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