Product Details

Product Description

1. Commodity: 25CrMo4 honed seamless tube

2. Manufacture method: cold drawn, cold rolled,hydraulic cold drawn

3. Internal surface treatment method: honing or skiving&roller burnishing

4. Size range: 60mm*50mm - 480mm*450mm

5. Standard&material: EN10305-1 E355,C45E,25CrMo4,34CrMo4,42CrMo4,DIN2391-2 ST52,ST52.3,ST52.4,ASTM A519 SAE1020,SAE1045,SAE1026,SAE4130,SAE4140,etc.

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

7. OD tolerance: as per DIN2391-1, EN10305-1, ASTM A519 or as per customer's requirement.

8. ID tolerance: H7,H8,H9,H10, or given by customer.

9. Wall Thickness tolerance (eccentricity): +/-5%

10. Roughness of internal surface(Ra):0.25um max for skived&roller burnished tube, 0.4um max for honed tubes.

11. Ovality of OD: 0.15mm max for tubes with OD below 150mm, 0.25mm max for tubes with OD above 150mm.

12. Straightness: 0.5mm/1000mm max for tubes below 3000mm, 0.8mm/1000mm max for tubes between 3000mm and 6000mm, 1.2mm/1000mm for tubes above 6000mm.

Classification of ID tolerance for honed tubes:

ID / MM	H7	H8	H9	H10
30<ID≤50	+0.025/-0	+0.039/-0	+0.062/-0	+0.100/-0
50<ID≤80	+0.030/-0	+0.046/-0	+0.074/-0	+0.120/-0
80<ID≤120	+0.035/-0	+0.054/-0	+0.087/-0	+0.140/-0
120<ID≤180	+0.040/-0	+0.063/-0	+0.100/-0	+0.160/-0
180<ID≤250	+0.046/-0	+0.072/-0	+0.115/-0	+0.185/-0
250<ID≤315	+0.052/-0	+0.081/-0	+0.130/-0	+0.210/-0
315<ID≤400	+0.057/-0	+0.089/-0	+0.140/-0	+0.230/-0
400<ID≤500	+0.063/-0	+0.097/-0	+0.155/-0	-

Packaging & Shipping

Tubes will be packed in bundles tied with steel strips, internal and external oil coating for anti rust protection, end plastic caps will be added to both ends.

Shipment: by containers.

Our Services

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

1. Honing

2. Skiving&roller burnishing

3. Deep hole boring

4. Grinding

5. External surface machining or machining as per drawing

6. Polishing

Company Information

We are ISO9001-2008 certified manufacturer of cylinder tubes,cylinder barrels,and cold drawn special tubings including:

1. Hydraulic cold drawn seamless tubes suitable for honing: 40mm*30mm-325mm*300mm, ID tolerance given by customer.

2. Honed or skived&roller burnished tubes: 60mm*50mm-325mm*250mm, ID tolerance of H8,H9,H10.

3. Hot rolled+deep hole bored+honed or skived&roller burnished+externally machined or cold drawn+honed or skived&roller burnished hydraulic cylinder barrels: ID of 50mm-250mm with length of 2800mm max, machining as per drawing.

FAQ

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

MOQ: 4 tons for each size.

Warranty: 1 year after shipment of tubes.

Third party inspection or customer's inspection is acceptable.

Addtional tests or inspections like hardness test,grain size test,metallical phase test,ultrasonic test is acceptable.

Trade term: FOB,CFR,CIF,DAP.