Application：

It can be used to shafts, gears and parts subject to mechanical wear.

Standard:

1. JIS G3441 Alloy Steel Tubes for Machine Purposes
2. EN10297 Seamless Circular Steel Tubes for Mechanical and General Engineering Purposes
3. ASTM A519 Standard Specification for Seamless Carbon and Alloy Steel Mechanical Tubing

Steel Grades:

1. JIS G3441: SCM435TK.
2. EN10297: 1.7220, 34CrMo4.
3. ASTM A519: 4135.

Competitive Advantage:

1. High strength.
2. High tenacity.
3. Good hardenability.
4. High resistance to thermal properties.
5. Competitive price.
6. Fast production leadtime.

Sizes Range:

OD:10.2mm-810mm, WT:1.6mm-100mm.

Chemical Composition(%):

Grades	C	Si	Mn	P	S	Cr	Ni	Mo	Cu
42CrMo	0.38-0.45	0.17-0.37	0.50-0.80	0.025 max	0.025 max	0.90-1.20	0.25 max	0.15-0.25	0.30 max
SCM440TK	0.38-0.43	0.15-0.35	0.60-0.85	0.03 max	0.03 max	0.90-1.20	0.25 max	0.15-0.30	0.30 max
42CrMo4	0.38-0.45	0.40 max	0.60-0.90	0.035 max	0.035 max	0.90-1.20	/	0.15-0.30	0.25 max
4140	0.38-0.43	0.15-0.35	0.75-1.00	0.040 max	0.040 max	0.80-1.10	/	0.15-0.25	0.30 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

Hot Rolled only
Stress Relieved
Annealed
Normalized
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 (Quenched and Tempered) (T=20°C if not differently stated)

Wall Thickness (mm)	Tensile Strength (Mpa)	Yield Strength(Mpa)	Elongation (Longitudinal) (%)	Elongation (Transverse) (%)	Notch impact energy (Longitudinal) [J]	Notch impact energy (Transverse) [J]
8 max	1100 max	900 min	10 min	8 min	30 min	/
8-20	1000 max	750 min	11 min	9 min	35 min	22 min
20-50	900 max	650 min	12 min	10 min	35 min	22 min
50-80	800 max	550 min	13 min	11 min	35 min	22 min

Recommended Heat Treatment Temperatures:

Heat Treatment	Temperatures (°C)
Annealing	680-720
Normalizing	840-880
Austenitizing	820-860
Tempering	540-680

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.