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Commodity: 4140 hydraulic seamless honed steel tube
Standard specification&material: DIN 2391-2 ST52,EN10305-1 E355,C45E,25CrMo4,42CrMo4,ASTM A519 SAE1020,SAe1026,SAE1045,SAE4130,SAE4140,SAE4145,etc.
Size range:40mm*30mm - 480mm*450mm
Manufacture method: cold rolled, hydraulic cold drawn
Delivery condition:
| BK | BKW | BKS | GBK | NBK |
| +C | +LC | +SR | +A | +N |
Internal surface treatment method: honing or skiving and roller burnishing
OD tolerance: as per DIN2391-1
ID tolerance: H7,H8,H9,H10 or given by customer.
W.T tolerance(eccentricity): +/-5%
Bore roughness(Ra): 0.4um max.
Chemical composition requirement of ST52 material:
| Element | C | Si | Mn | P | S |
| Content (%) | 0.21% max | 0.55% max | 1.60% max | 0.025% max | 0.025% max |
Mechanical properties of E355 tubes:
| BK | BKW | BKS | GBK | NBK | |
| Tensile strength: | 640 Mpa min | 580 Mpa min | 580 Mpa min | 490 Mpa min | 490Mpa-630Mpa |
| Yield strength | - | - | 420 Mpa min | - | 355 Mpa min |
| Elongation | 4% min | 7% min | 10% min | 22% min | 22% min |
Packing: tubes will be packed in bundles tied with steel strips. Slightly internal and external oil coating for anti-rust protection. End plastic caps. External packing by knit bags.
Marking on each piece of tube: to be confirmed.
Mechanical stamp on each piece of tube can be provided.
External machining or external polishing service can be provided.
End machining service can be provided.
Payment: 30% deposit,balance before shipment or against copy of B/L or L/C at sight.
MOQ: 4 tons for each size.
Warranty: 1 years aftre receipt of tubes.
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