Description

1. Raw material

Honing is the commonly used prcessing for the tubes after cold drawing. The steel grade is same as the cold drawn tubes.

DIN2391-2: ST37, ST52
EN10305-1 EN10083: E235, E355, E410, E470, C45E, 34CrMo4, 42CrMo4
ASTM A519: SAE1020, SAE1045, SAE1026, SAE4130, SAE4140
GB/T3639 GB8713: 20#, 16Mn, 45#, 25Mn, 30CrMo, 40CrMo

2. Accuracy

Honing provides much higher accuracy and better quality. It is widely used in hydraulic cylinder tubes, pneumatic cylinder tubes and other machinery parts.

ID tolerance: H7, H8
Wall thickness deviation: ±5%
OD tolerance: ±0.3mm
Length: ≤6m
Straightness: 0.3mm/m
Inner surface finish: ≤0.4μm

3. Delivery condition

For most of the cylinder tubes, the delivery condition is always stress relieved. Other delivery condition as follows is also available:

+C/BK: Cold drawn without heat treatment
+LC/BKW: Cold drawn without final heat treating
+SR/BKS: Stress relieved
+A/GBK: Annealed
+N/NBK: Normalized
Q+T: Quenched+Tempered

4. Sizes
 

5. Process