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Specifications

DIN2391 st52 H8 Honed Tube for Hydraulic Cylinder

1 OD32-500mm W. T. 3.5-80mm

2 ISO certificated DIN2391 En10305

3 Straightness: 0.3~1mm/m

4 Inside Roughness: 0.4~0.8um

steel pipes for hydraulic use

Material: C20, CK45, etc. Also ST52 if given enough time. Our products are widely used in hydraulic industry and is very popular both home and abroad.

And we can also make our products according to the customers' needs.

Variety

Processing	Cylinder diameter	Length /mm	Straightness	Size accuracy	Wall thickness/mm	Inner bore roughness
Cold-drawn	ID30~OD250	≤ 13M	0.3~1.0mm/m	H9-H11	± 8%	0.8~1.6um
Honed tube	ID50~OD325	≤ 10M	0.3~1.0mm/m	H7-H9	± 8%	0.4~0.8um

Mechanics performance

Material	Tensile strength	Yield strength	Elongation	Hardness
Ck20	510 σ N/mm2	500σ sN/mm2	5δ s%	175HB
Ck45	660 σ N/mm2	630σ sN/ mm2	4δ s%	207HB
ST52	580σ N/mm2	420σ sN/ mm2	10δ s%	190HB
27SiMn	840σ N/mm2	805σ sN/ mm2	7.5δ s%	230HB

Dimension tolerance

ID size	ID deviation (mm)
ID size	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