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
|
500σsN/mm2
|
5δs%
|
175HB
|
|
Ck45
|
660 σN/mm2
|
630σsN/ mm2
|
4δs%
|
207HB
|
|
ST52
|
580σ N/mm2
|
420σsN/ mm2
|
10δs%
|
190HB
|
|
27SiMn
|
840σ N/mm2
|
805σsN/ mm2
|
7.5δs%
|
230HB
|
Dimension tolerance
|
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
|