Application:

This is one of the most commonly used alloy quenched and tempered steel, used in manufacturing bear under moderate load and medium speed operating conditions of mechanical parts, such as automotive steering knuckles, gears and rear axle on the machine shaft, worm, spline shaft, top sets, and also may be quenched after high-frequency surface hardening for manufacturing a high surface hardness and wear resistance without great impact parts. Such as gears, sleeves, shafts, spindles, mandrels, pins, connecting rod bolt, intake valves, etc.. It can also be hardened, medium or low temperature tempering. And it can be manufactured heavy duty parts, and is suitable for manufacturing Oxycarbonitride permeation treatment of various transmission parts, such as large diameter and good low temperature toughness requirements gears and shafts .

Standard:

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

Steel Grades:

JIS G3441: SCR440
EN10297: 41Cr4 / 1.7035
ASTM A519: 5140

Competitive Advantage:

High strength
High tenacity
Good hardenability
High resistance to thermal properties.
Competitive price
Fast production leadtime
All the material are inspected with 3 times to meet the highly standards

Sizes Range:

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

Chemical Composition(%):

GradesCSiMnPSCrNi

40Cr	0.37-0.44	0.17-0.37	0.50-0.80	0.025 max	0.025 max	0.80-1.10	0.25 min
SCR440	0.37-0.44	0.15-0.35	0.55-0.90	0.03 max	0.03 max	0.85-1.25	0.25 min
41Cr4	0.38-0.45	0.40 max	0.60-0.90	0.035 max	0.035 max	0.90-1.20	/
5140	0.38-0.43	0.15-0.35	0.70-0.90	0.04 max	0.04 max	0.70-0.90	/
530M40	0.36-0.44	0.10-0.40	0.60-0.90	0.035 max	0.040 max	0.90-1.20	/

Outer Diameter Tolerances

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

Wall Thickness Tolerances

Scope of Outer DiameterRatio 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

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)

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	1000 max	800 min	11 min	9 min	30 min	/
8-20	900 max	660 min	12 min	10 min	35 min	22 min
20-50	800 max	560 min	14 min	12 min	35 min	22 min

Recommended Heat Treatment Temperatures

Heat TreatmentTemperatures (°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

Our Services:

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

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