Product Details

Product Description

Commodity: E355 H8 honed tubing BKS

Types: cold drawn or cold rolled seamless tubes suitable for honing or skiving and roller burnishing, honed tubes,and skived and roller burnished tubes

Standard specification&material: EN 10305-1 E355,C45E,25CrMo4,34CrMo4,42CrMo4 and equivalent standard and material.

Size range:

Tubes suitable for honing or skiving and roller burnishing: 40mm*30mm - 325mm*300mm

Honed tubes: 40mm*30mm - 480mm*450mm

Skived and roller burnished tubes: 73mm*63mm - 300mm*280mm

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 of tubes suitable for honing or skiving and roller burnishing: given by customer

ID tolerance of honed tubes or skived and roller burnished tubes: H7,H8,H9,H10 or given by customer.

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

Bore roughness(Ra): 0.25um max for skived and roller burnished tubes, 0.4um max for honed tubes.

Chemical composition requirement of E355 material:

Element	C	Si	Mn	P	S
Content (%)	0.22% 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	450 Mpa min	490Mpa-630Mpa
Yield strength	-	-	450 Mpa min	-	355 Mpa min
Elongation	4% min	7% min	10% min	22% min	22% min

Packaging & Shipping

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.

Our Services

External machining or external polishing service can be provided.

End machining service provided.

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 receipt of tubes