Application:

Tubular parts for the automotive, oil and gas, construction, general engineering and agricultural industry, such as bushes, hydraulic cylinders, hollow shafts, rings, hollow rolls for conveyors, nuts, gear wheels, shafts, axles, stuffing boxes, spindles, drill jigs, rolls etc.

Chemical Composition(%):

GradesCSiMnPSCrMoNiNb

Outer Diameter Tolerances

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

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

Wall Thickness (mm)Tensile Strength (Mpa)Yield Strength(Mpa)Elongation A5 (L) (%)

Surface Hardening Treatments:

Carbonitriding
Carburising
Case Hardening
Hardening
Nitriding

Pipe Body Heat Treatment:

Hardening:
Heat to 870 oC – 925 oC as required, hold until the temperature is uniform throughout the section, soak 10 – 15 minutes per 25mm of section and quench in oil or water as required.Temper immediately while still hand warm.
Tempering: Re heat to 500 oC – 600 oC as required, hold until temperature is uniform throughout the section, soak for 1 hour per 25mm of section. Cool in still air.
Normalizing:
Heat to 900 oC – 925 oC, hold until temperature is uniform throughout the section, soak for 30 minutes and cool in still air.
Stress Relieving:
Heat the weld area to 550 oC – 650 oC, soak for 30 minutes and cool in still air or furnace.
*Notes on Heat Treatment: Heating temperatures, rates of heating, cooling and soaking times will vary due to factors such as work piece size/shape, also furnace type employed, quenching medium and workpiece transfer facilities etc.

Welding:

Excellent weldability as supplied but welding not recommended when surface hardened or through hardened.
Apre-heat or post-heat required however, pre-heating larger sections can be beneficial as can a post-weld stress relieve. (Ave. Ceq = 0.50)

Surfaces Protection:

The tubes are protected internally and externally with oil, which provides temporary protection against oxidisation when undercover.

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.

Our Services:

Third Party inspection acceptable. such as SGS, BV etc.

Supplying financial support with usance L/C 180 days after B/L date.