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Precision cold drawn steel pipe

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Hydraulic, pneumatic cylinder specification size, precision Hydraulic  and  pnoumate  linear  actuator  sandars

 

Processing methods

Working  method

Inner diameter of cylinder mm

Cylinder  ID

length m

Length

Straightness mm/m

Straightness

Inner Diameter Accuracy    ID  Tolerance

Wall thickness difference

WT  Tolerance

Inner hole roughness Um  Roughness

cold drawn

Cold  drawn

40-320

≤12m

0.2-0.5


±5%

0.8-1.6

cold rolling

Cold  Rolled

30-100

≥12m

0.2-0.5


±5%

0.8-1.2

Cold drawing - honing

CD-Honed

40-500

8m

0.2-0.3

H8-H9

±5%

0.2-0.8

cold call-rolling

cd-SBB

40-400

7m

0.2-0.3

H8-H9

±5%

≤0.4

Deep hole boring - honing

Rolled-Honed

320-400

8m

0.2-0.3

H8-H9

±8%

≤0.8

Deep hole boring - rolling

Rolled-SBB

320-400

7m

0.2-0.3

H8-H9

±8%

≤0.4

 

Mechanicalmechanical  property

 

 

steel type

Steel  grade

cold-drawn

(hard)(BK)

Cold drawing + stress relief annealing

cold  drawn  and  stress-relieved(BK+S)

hardness

Hardness

HB

tensile strength

TS

g    bN/mm²

Elongation

elongation

35%

tensile strength

TS

bN/mm2

Yield Strength

YS

g  n/mm2

Elongation

elongation

35%

20#

≥550

≥8

≥520

≥470

≥12


45#

≥650

≥5

≥600

≥520

≥12


16Mn

≥640

≥5

≥600

≥520

≥15


25Mn

≥640

≥5

≥600

≥510

≥15


27SiMn

≥840

≥5

≥800

≥720

≥10


 


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