FARBO 350 - Chrome silicon vanadium tempered steel wire

Oil tempered spring wire - High tensile strength

trade, sales, commerce, marketing, distribution, oil tempered steel wire, tempered chrome silicon vanadium steel wire, oil tempered spring wire, tempered chrome silicon vanadium spring wire, high tensile strength properties, stress springs, suspension springs, truck brake system, EN 10270-2 FD CrV, EN 10270-2 FDCrV, DIN 17223/2 FD, DIN 50602, M method, coil end tested

In compliance with:
F.A.R. internal standard
For the properties not provided here, quality FD CrV, EN 10270-2 shall be considered
DIN 17223/2 FD

Utilization:
For stress springs – i.e. suspension springs, truck brake system or similar utilization with high working regimes and good relaxation properties

Diameters:
3.00 - 12.50 mm

Chemical composition:

C	Si	Mn	P	S	Cu	V	Cr
0.50 - 0.65	1.35 - 1.65	0.35 - 0.70	<0.025	<0.025	<0.12	0.15 - 0.25	0.40 - 0.70

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
3.00 - 4.00		2000 - 2200		to be agreed upon
4.00 - 6.00		1950 - 2150		to be agreed upon
6.00 - 9.00	0.035	1900 - 2100		not expected
9.00 - 10.00	0.040	1850 - 2050	40	not expected
10.00 - 12.00	0.050	1850 - 2050	40	not expected
12.00 - 12.50	0.050	1830 - 2030	35	not expected

• 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