FARBO 206 - Chrome silicon tempered steel wire

Oil tempered spring wire - Continuously tested - For normal duty dynamic springs

trade, sales, commerce, marketing, distribution, oil tempered steel wire, chrome silicon tempered steel wire, oil tempered spring wire, chrome silicon tempered spring wire, normal duty dynamic springs, EN 10270-2 FD CrSi, EN 10270-2 FDCrSi, DIN 17223/2 VD, DIN 50602, M method, continuously tested

In compliance with:
EN 10270-2 TD CrSi
DIN 17223/2 VD

Utilization:
For moderate duty dynamic stress – clutch springs or similar utilization, where good relaxation properties and heat resistance at high working temperature are requested

Diameters:
2.40 - 10.00 mm

Chemical composition:

C	Si	Mn	P	S	Cu	Cr
0.50 - 0.60	1.20 - 1.60	0.50 - 0.90	<0.03	<0.02	<0.09	0.50 - 0.80

Raw Material:
Wire rod from qualified international steelworks

Non destructive defects control:
In line tested wire on the whole length for surface defects of minimum depth of 60 µm

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
2.40 - 2.50	0.025	1960 - 2060	50	6 - 14
2.50 - 2.70	0.025	1910 - 2010	50	6 - 12
2.70 - 3.50	0.030	1910 - 2010	50	6 - 12
3.00 - 3.20	0.030	1910 - 2010	45	6 - 10
3.20 - 3.50	0.030	1910 - 2010	45	6 - 10
3.50 - 4.00	0.030	1860 - 1960	45	6 - 8
4.00 - 4.20	0.035	1860 - 1960	45	6 - 8
4.20 - 4.50	0.035	1860 - 1960	45	6 - 8
4.50 - 4.70	0.035	1810 - 1910	45	6 - 6
4.70 - 5.00	0.035	1810 - 1910	45	6 - 6
5.00 - 5.60	0.035	1810 - 1910	40	6 - 6
5.60 - 6.00	0.040	1760 - 1860	40	6 - 4
6.00 - 6.50	0.040	1760 - 1860	40	to be agreed upon
6.50 - 6.00	0.040	1710 - 1810	40	to be agreed upon
7.00 - 8.00	0.045	1710 - 1810	40	to be agreed upon
8.00 - 8.50	0.045	1670 - 1770	38	to be agreed upon
8.50 - 10.00	0.050	1670 - 1770	38	to be agreed upon

• Allowed depth of surface defects at the coil ends: max. 1.3% of wire diameter
• Allowed depth of surface decarburisation at the coil ends: max. 1.3% 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