din2391 st52 bks h8 cold drawn hydraulic cylinder seamless precision steel honed tube

din2391 st52 bks h8 cold drawn hydraulic cylinder seamless steel honed tube 

Standard

DIN2391

Material

ST45, ST52, E355, E355SR, STKM13C, SAE1026, 20#, Q235B, CK45...

Heat treatment

BK+S

Specification

Outer diameter(mm)                               

Inner diameter(mm)                               

50-300mm

40-250

I.D Tolerance

H8-H9

Length

3-9m (Customers usually choose the 4~5.8m)

Straightness

1/1000

ID roughness

RA 0.4micron(max)

Technology

Honed & SRB(SKIVED AND ROLLER BURNISHED )

Scope

Honed tube for hydraulic cylinder, swivel crane, injection machine and 

construction machine application

Material

C

Si

Mn

S(≤)

P(≤)

Cr

Ni

Mo

other

C20#

0.17—0.23

0.17—0.37

0.35—0.65

0.035

0.035

≤0.25

≤0.30

Cu≤0.25

CK45#

0.42—0.50

0.17—0.37

0.50—0.80

0.035

0.035

≤0.25

≤0.30

Cu≤0.25

Q345B

≤0.20

≤0.55

1.00—1.60

0.040

0.040

0.02-0.15

0.015-0.06

0.02-0.20

Alt≥0.015

ST52

E355

16Mn

≤0.20

≤0.55

1.00—1.60

0.045

0.045

0.02-0.15

0.015-0.06

0.02-0.20

25Mn

0.22—0.30

0.17—0.37

0.70—1.00

0.035

0.035

≤0.25

≤0.25

27SiMn

0.24—0.32

1.10—1.40

1.10—1.40

0.030

0.030

42SiMn

0.39—0.45

1.10—1.40

1.10—1.40

0.030

0.030

42CrMo

0.38—0.45

0.17—0.37

0.50—0.80

0.025

0.025

0.90—1.20

0.15—0.25

Processiong form

I.D

length

straightness

I.D tolerance

I.D rounghness

Cold rolled

20-100

≤10M

0.3-1.0

H7-H9

0.4-1.6

Cold drawn

76-245

≤12M

0.3-1.0

H7-H9

0.8-1.6

honed

40-180

≤7M

1000

H7-H9

0.4-0.8

SRB

63-180

≤7M

1000

H7-H8

0.1-0.4