FARBO 100 - Carbon tempered steel wire

Oil tempered spring wire - For normal duty dynamic springs

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In compliance with:
EN 10270-2 TD C
DIN 17223/2 FD

Utilization:
Normal duty dynamic springs, clutch springs or similar utilization

Diameters:
2.00 - 10.00 mm

Chemical composition:

C	Si	Mn	P	S	Cu	Cr
0.65 - 0.75	0.15 - 0.35	0.50 - 1.20	<0.02	<0.02	<0.1	*

* With the addition of Chrome (0.15-0.30%) deliverable

Raw Material:
Wire rod from qualified international steelworks

Non metallic inclusions:
In compliance with DIN 50602, M method, for all kind of inclusions the maximum size is No. 2

Mechanical and technological properties:

Nominal diameter (a < Ø ≤ b) [mm]	Allowed deviations (±) [mm]	Tensile strength [N/mm²]	Minimum reduction [Z %]	Minimum number of twists Lo = 50 × d Min. 100% Right - Left
2.00 - 2.50	0.025	1630 - 1730	50	6 - 14
2.50 - 2.70	0.025	1600 - 1700	50	6 - 12
2.70 - 3.50	0.030	1600 - 1700	50	6 - 12
3.00 - 3.20	0.030	1570 - 1670	45	6 - 12
3.20 - 3.50	0.030	1570 - 1670	45	6 - 10
3.50 - 4.00	0.030	1550 - 1650	45	6 - 10
4.00 - 4.20	0.035	1550 - 1650	45	6 - 8
4.20 - 4.50	0.035	1550 - 1650	45	6 - 8
4.50 - 4.70	0.035	1540 - 1640	45	6 - 8
4.70 - 5.00	0.035	1540 - 1640	45	6 - 6
5.00 - 5.60	0.035	1520 - 1620	40	6 - 6
5.60 - 6.00	0.040	1520 - 1620	40	6 - 6
6.00 - 6.50	0.040	1470 - 1570	40	6 - 4
6.50 - 6.00	0.040	1470 - 1570	40	to be agreed upon
7.00 - 8.00	0.045	1420 - 1520	40	to be agreed upon
8.00 - 8.50	0.045	1390 - 1490	38	not expected
8.50 - 10.00	0.050	1390 - 1490	38	not expected

• Allowed depth of surface defects at the coil ends: max. 0.8% of wire diameter
• Allowed depth of surface decarburisation at the coil ends: max. 0.8% of wire diameter
• Maximum permissible tensile strength variation within one coil: 60 N/mm²
• Out of roundness: i.e. the difference between the maximum and minimum diameter of the wire at the same cross section is not more than 50% of the total permissible deviation in the diameter
• Yield point (limit 0.2%): minimum 90% of tensile strength
• Elastic modulus: E = 206 kN/mm² (nominal value)
• Shear modulus: G = 79.5 kN/mm² (nominal value)
• Heat treatment: after the coiling the springs should be stress relieved at T = 420 ± 5°C for 30 min; after shoot peening should be stress relieved at T = 250 ± 10°C for 30 min