Oil tempered chrome silicon vanadium steel wire valve quality

Oil tempered valve spring wire - High tensile strength - For highly dynamic duty

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In compliance with:
EN 10270-2 VD SiCrV
similar to DIN 17223/2 VD SiCr

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

Diameters:
3.00 - 18.50 mm

Chemical composition:

C	Si	Mn	P	S	Cu	V	Cr
0.50 - 0.70	1.20 - 1.65	0.40 - 0.90	≤ 0.020	≤ 0.020	≤ 0.06	0.10 - 0.25	0.50 - 1.00

Raw Material:
Wire rod from qualified international steelworks

Non destructive defect control:
In line tested wire on the whole length for surface defects of minimum depth of 40, 50 or 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
3.00 - 3.20	0.025	2060 - 2210	45	4
3.20 - 3.50	0.025	2010 - 2160	45	4
3.50 - 4.00	0.025	2010 - 2160	45	4
4.00 - 4.20	0.030	1960 - 2110	45	3
4.20 - 4.50	0.030	1960 - 2110	45	3
4.50 - 5.00	0.030	1960 - 2110	40	3
5.00 - 5.60	0.030	1910 - 2060	35	3
5.60 - 6.50	0.035	1910 - 2060	35	3
6.50 - 7.00	0.035	1860 - 2010	35	to be agreed upon
7.00 - 8.00	0.040	1860 - 2010	35	to be agreed upon
8.00 - 9.00	0.040	1810 - 1960	35	to be agreed upon
9.00 - 10.00	0.045	1810 - 1960	35	to be agreed upon
10.00 - 12.00	0.050	1770 - 1910	35	to be agreed upon
12.00 - 14.00	0.060	1770 - 1910	30	to be agreed upon
14.00 - 15.00	0.060	1770 - 1910	to be agreed upon	to be agreed upon
15.00 - 17.00	0.070	1730 - 1860	to be agreed upon	to be agreed upon
17.00 - 18.50	0.070	1730 - 1860	to be agreed upon	to be agreed upon

• Allowed depth of surface defects at the continuouslys: max. 1.0% of wire diameter
• Allowed depth of surface decarburisation at the continuouslys: max. 1.0% of wire diameter
• Maximum permissible tensile strength variation within one coil: 50 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 shot peening should be stress relieved at T = 250 ± 10°C for 30 min

 

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Alloy	EN 10270-2	Stress
unalloyed	FD C	high duty dynamic
unalloyed	TD C	dynamic
unalloyed	VD C	hoch dynamic
SiCr-alloyed	FD SiCr	high duty dynamic
SiCr-alloyed	TD SiCr	dynamic
SiCr-alloyed	VD SiCr	highly dynamic
SiCr-alloyed	VD SiCr SC	highly dynamic
SiCrV-alloyed	FD SiCrV	high duty dynamic
SiCrV-alloyed	TD SiCrV	dynamic
SiCrV-alloyed	VD SiCrV	highly dynamic
SiCrV-alloyed	VD SiCrV SC	highly dynamic

 

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  For spring wire according to EN 10270-1, DIN 17223/1, please click here