Standard:

BS EN10294 Hollow bars

Main Characteristics

1. Improved machinability steels.
2. High surface quality (guaranteed by internal non distructive inspections).
3. Tight dimensional tolerances.
4. Guarantee surfaces without defects with.
5. Minimum weight loss due to turning.

Steel Grades:

EN10294: E355J2 1.0592

Sizes Range:

OD10.2mm-810mm, WT: 1.6mm-100mm

Chemical Composition(%):

Grades	C	Si	Mn	P	S	Cr	Ni	Mo	Al	Cu	N	Nb	Ti	V
E355J2	0.22 max	0.55 max	1.60 max	0.03 max	0.015-0.030	0.30 max	0.30 max	0.08 max	0.01-0.06	0.30 max	0.05 max	0.05 max	0.10 max

Outer Diameter Tolerances

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

Wall Thickness Tolerances

Scope of Outer Diameter	Ratio of Wall Thickness and Outer Diameter (WT/OD)	Tolerance
102mm max	/	+/12.5% or +/-0.4mm (Chose the bigger one)
102mm min	0.05 max	+/15% or +/-0.4mm (Chose the bigger one)
102mm min	0.05-0.10	+/12.5% or +/-0.4mm (Chose the bigger one)
102mm min	0.10 min	(-10%, +12.5%)

Delivery Conditions

1. Hot Rolled only.
2. Stress Relieved.
3. Annealed.
4. Normalized.
5. Quenched and Tempered.

Surfaces Conditions

1. Black surface with oxygen skin.
2. Grinded for external or internal surface, or external and internal surface.
3. Peeled for external or internal surface, or external and internal surface.

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

Wall Thickness (mm)	Tensile Strength (Mpa)	Yield Strength(Mpa)	Elongation A5 (L) (%)	Minimum average absorbed energy KV, (J)
16 max	490 min	355 min	20 min	27 min
16-25	490 min	345 min	20 min	27 min
25-40	470 min	335 min	20 min	27 min
40-50	470 min	335 min	20 min	27 min

Impact Test

The shown values are related to a longitudinal specimen having a width W = 10 mm. If W is lower than 10 mm, the measured energy value in J must be transformed on the basis of the formula: KV = (KVmeasured x 10) / W.

Machinability

Our material allow a much better performance in machinability than the standard foreseen by the norm. The cutting speed, for 10 minutes life of the cutting edge, is equal to 465 m/min, exceeding the norm by almost 50%.

Weldability:

The material have good welding properties thanks to low carbon equivalent content (Ceq 0.49% max). This means that in standard conditions, tubes can be welded without pre-heating.

Heat Treatments

Approximate transformation temperatures are: Ac1= 715 °C Ac3 = 810 °C.
The austenitisation temperature recommended for normalising heat treatment is 880 °C.

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.