Processing the form

Cylinder diameter

Length

Straightness

Dimensional accuracy

Wall thickness

Inner hole roughness

cold drawn

48~325

≤ 12m

0.3~0.8mm/m

±10%

0.8~1.6µm

honing

48~325

≤10m

0.3~0.8mm/m

H8~H9

±10%

0.3~0.8µm

rolling

50~250

≤  9m

0.3~0.8mm/m

H7~H9

±10%

0.01µm

Material

Tensile strength

Yield strength

Elongation

Hardness

20#

530σbN/mm2

505σbs/mm2

12σs%

175HB

45#

660σbN/mm2

630σbs/mm2

6σs%

207HB

16Mn

595σbN/mm2

570σbs/mm2

9σs%

190HB

27SiMn

840σbN/mm2

805σbs/mm2

7.5σs%

230HB