DIN2391-2 ST52 seamless precision honed steel tube

1. Commodity:  DIN2391-2 ST52 seamless precision honed steel 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:

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.

We can ship the tubes based on FOB,CFR,CIF or DAP term.

We manufacture honed tubes from 40mm*30mm to 480mm*450mm with length upto 7000mm. External surface can be machined or polished as per customer's requirement.

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.