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1. Commodity: 25CrMo4 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:
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 |
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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.
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