Processing

Cylinder diameter

Length /mm

Straightness

Size accuracy

Wall thickness/mm

Inner bore

roughness

Cold-drawn

ID50~OD325

≤12m

0.3~0.8mm/m

±8%

0.8~1.6um

Honed tube

ID50~OD325

≤10m

0.3~0.8mm/m

H8~H9

±8%

0.2~0.6um

Material

Tensile

strength

Yield

strength

Elongation

Hardness

Ck20

530 N/mm²

505σsN/mm2

12δs%

175HB

Ck45

660 σN/mm²

630σsN/ mm²

6δs%

207HB

ST52

580σ N/mm²

420σsN/ mm²

10δs%

190HB

27SiMn

840σ N/mm²

805σsN/ mm²

7.5δs%

230HB

ID size

ID deviation (mm)

H7

H8

H9

H10

30

+0.021

0

+0.033

0

+0.052

0

+0.084

0

>30~50

+0.025

0

+0.039

0

+0.062

0

+0.100

0

>50~80

+0.030

0

+0.046

0

+0.074

0

+0.120

0

>80~120

+0.035

0

+0.054

0

+0.087

0

+0.140

0

>120~180

+0.040

0

+0.063

0

+0.100

0

+0.160

0

>180~250

+0.046

0

+0.072

0

+0.115

0

+0.185

0

>250~315

+0.052

0

+0.081

0

+0.130

0

+0.210

0

>315~400

+0.0527

0

+0.089

0

+0.140

0

+0.230

0