Zhenhua has been focusing on cylinder tube production for a long time. We provide different kinds of product processed by different ways. The raw materials are from famous steel companies in cities like Shanghai, Tianjin. Long term relationship has been developed between Zhenhua and these suppliers, so we have certain advantages in terms of material price and quality.
Before the delivery by sea, we will spread rust-preventative oil in the cylinder tube and seal the hole with bubble wrap to avoid rust. So clients can receive flawless cylinder barrel.
To get accurate cylinder component, we have purchased advanced processing facilities, such as 350T cold drawing unit, large hole boring mill, advanced CNC skiving and roller burnishing machine. Specifically, the CNC skiving and roller burnishing machine adopts a world-class advanced technology combination of skiving and roller burnishing. Thus the IT grade could reach IT8. The surface roughness could reach Ra 0.1-0.4 μm.
|Domestic market||20#||45#||16Mn||25Mn||27SiMn||GB/T 3639-2009||BK+S/BK|
|Q345B, Q345D, Q345E|
|Oversea market||ST45||CK45||ST52||/||/||DIN2391EN 10204: 2004EN 10305-1: 2002|
|Tube||Diameter (mm )||Length (m)||Straightness||Tolerance||Internal roughness|
|Cold drawn pipe||φ30-360/φ1 1/4" -φ14"||≤13||0.5-1/1000||H10-H11||1.6|
|Honed pipe||φ40-1000/φ1 1/2" -φ40"||≤13||0.5-1/1000||H8-H9||0.8|
|Skived and roller burnished pipe||φ63-360/φ2 1/2" -φ14"||≤13||0.5-1/1000||H8||0.05-0.2|
Each kind of material, from its coming in the plant to every processing step, for different batches of cylinder tube will be determined by a arrange of tests mainly including metallographic test, tension test and impact test.
We press steel seal and batch number in the tube's surface, so that we can track the performance and every processing step of our product.
To avoid flaws, such as tube deformation, caused during the delivery, we use a forklift for the loading operation, while steel band is used to wrap the cylinder tube. Besides, we have bespoke wood boxes or iron boxes to case relatively shorter barrels.