4340 SNCM439 Alloy Steel Tubes for Mechanical Purpose

Application:

•Hydraulic Cylinders: Motocranes, Tractors and Trucks
•Bearings: Car Components
•Mining Equipment: Powered Roof Supports, Hydraulic Pit Props
•Cranes and Agricultural Engineering: Tour Cranes, Tractors and Harvesters
•Rollers: Conveyor Rollers, Tubes for Textile, Paper, and Printing industries, Steel Plant Rollers
•Downhole Equipment: Submerged Pumps

Steel Grades:

ASTM A519: 4340

JIS: SNCM439

Competitive Advantage:

High strength
High tenacity
Good hardenability
High resistance to thermal properties.
Competitive price
Fast production leadtime

Sizes Range:

OD:40mm-810mm, WT:2mm-100mm

Chemical Composition(%):

Outer Diameter Tolerances

+/-1%, or +/-0.5mm (Chose the bigger one)

Wall Thickness Tolerances

Delivery Conditions

Hot Rolled only
Stress Relieved
Annealed
Normalized
Quenched and Tempered

Surfaces Conditions

Black surface with oxygen skin
Grinded for external or internal surface, or external and internal surface
Peeled for external or internal surface, or external and internal surface

Mechanical Properties (Quenched and Tempered) (T=20°C if not differently stated)

Recommended Heat Treatment Temperatures

Tube ends:

The hollow bar comes with square cut and deburred ends.

Certification:

The hollow bar is supplied with 3.1.B inspection certificate,according to the standards EN 10204 and ISO 10474.

Identification and Marking:

The hollow bar is marked in indelible ink, the details being repeated along the entire length of each tube and on a label, as follows:
Manufacturer’s trademark – manufacturing standard – dimensions -steel grade – supply condition – cast no. – item number.

Packaging:

The hollow bar comes in strapped bundles. The minimum weight of each bundle is 2000kg; the maximum bundle weight being 5000kg, with a minimum of 4 pieces