Commodity: ASTM A519 SAE4140 seamless honed tubing

Standard specification&material: DIN 2391-2 ST52,ASTM A519 AISI1020,AISI1026,AISI1045,AISI4130,SAE4140,AISI4145,etc.

Size range:73mm*63mm - 325mm*300mm

Manufacture method: cold rolled, hydraulic cold drawn

Delivery condition: 

Internal surface treatment method: honing or skiving and roller burnishing

OD tolerance: as per DIN 2391-1

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

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

Bore roughness(Ra): 0.25um max.

Chemical composition requirement of ST52 material:

Mechanical properties of E355 tubes:

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 is available.

External machining or external polishing service can be provided.  

Other tests&inspections like hardness test,metallic phase test,grain size test,ultrasonic test can be negotiated.

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 after receipt of tubes.