Commodity: St52 cold drawn honed seamless tubing

Standard specification and material:DIN2391-2 ST52,ST52.3,ST52.4,EN10305-1 E355,C45E,25CrMo4,34CrMo4,42CrMo4, ASTM A519 SAE1020,SAE1026,SAE1045,SAE4130,SAE4140, and other carbon steel and alloy steel.

Size range:73mm*63mm-325mm*300mm

Manufacture method: cold rolled, hydraulic cold drawn

Delivery condition: BK,BKW,BK+S,GBK,NBK.

Internal surface treatment method: honing or skiving&roller burnishing

OD tolerance: as per DIN2391-1, EN10305-1, or ASTM A519

ID tolerance of honed tubes: H7,8,H9,H10 or given by customer.

Wall thickness tolerance (eccentricity): +/-5%

Roughness of internal surface(Ra): 0.25um max for skived&roller burnished tubes, 0.35um max for honed tubes.

Chemical composition - ST52

Mechanical properties - BKS

Packing: in bundles tied with steel strips.

Slightly internal and external oil coating.

End plastic caps covering both ends.

Marking: to be confirmed.

Based on the manufacturing facilities,the following services are available:

1. Internal honing or skiving&roller burnishing.

2. External surface polishing

3. External surface machining

4. Internal threading 

We are ISO9001-2008 certified manufacturer of hydraulic cylinder tubes including cold drawn seamless tubes suitable for honing,honed tubes and skived&roller burnished tubes as well we cylinder barrels.  

Payment method: 30% deposit,balance before shipment or against copy of B/L or L/C at sight.

MOQ: 4 tons for each size.

Trade term: FOB,CFR,CIF,DAP.

Warranty: 1 year after shipment of tubes.

Third party inspection or customer's inspection is acceptable.