25CrMo4 unhoned seamless tube is a kind of alloy steel seamless precision steel tubes with negative ID tolerance for further honing or skiving&roller burnishing. This kind of tube will be used to produce hydraulic cylinder barrels after further internal honing or internal skiving&roller burnishing.

Commodity: 25CrMo4 unhoned seamless tube

Standard&material: EN10305-1 25CrMo4 and other steel grades like E355,34CrMo4,42CrMo4,DIN2391-2 ST52,ASTM A519 SAE1020,SAE1026,SAE1045,SAE1541,SAE4130,SAE4140,etc.

Size range: 40mm*30mm-325mm*300mm

Manufacture method: cold rolled, hydraulic cold drawn

Delivery condition:

ID tolerance: appointed by buyer. Generally, we suggest -0.4mm/-0.7mm for honing, -0.7mm/-1.0mm for skiving&roller burnishing.

OD tolerance: as per EN10305-1

W.T tolerance (eccentricity): +/-5%

Straightness: 0.5mm/1000mm max, 0.8mm/1000mm max, 1.2mm/1000mm max depending on different size and length.

Chemical composition - 25CrMo4:

Packing method: in bundles tied with steel strips.

Slightly internal and external oil coating for anti-rust protection.

End plastic caps covering both ends of tube.

Marking on each tube: to be confirmed.

Mechanical stamp on each tube: to be confirmed.

Shipping: by containers.  

Based on the machines and manufacturing facilities we have, the following services can be provided:

1. Internal honing

2. External surface polishing

3. OD grinding

4. deep hole drilling

5. End machining

6. Internal threading

7. End welding

We are ISO9001-2008 certified manufacturer of hydraulic cylinder tubes and cylinder barrels with annual capacity of 12000 tons.

Payment method we accept:

30% deposit,balance before shipment.

30% deposit,balance against copy of B/L.

30% deposit,balance against L/C at sight.

Delivery time: 30 days for CDS tubes,50 days for skived and roller burnished tubes, 60 days for honed tubes.  

MOQ: 4 tons for each size.

Trade term we accept: FOB,CFR,CIF,DAP.

Third party inspection or customer's inspection is acceptable.