Oil tempered SiCrVMo-alloyed ultra-high tensile valve spring wire for surface nitriding

OTEVA® 91 SC is a Super Clean steel, especially intended for the manufacture of clutch/transmission springs with extremely high fatigue properties and good relaxation properties at increased working temperatures.
Manufactured as standard in shaved condition in sizes from Ø 2.00 mm to 10.0 mm, or in egg or elliptical shape corresponding to round cross section 2.50 mm to 6.00 mm. Other wire sizes on request.

Very high fatigue
High tensile
High sag resistance

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Product request

High fatigue with excellent surface condition

for applications with high cyclic fatigue requirements

Alloyed Steel

Surface nitridable steel suitable for various applications with high requirements in fatigue, wear resistance and relaxation in moderate temperatures.


Consistent surface conditions for high performance in forming process

Product information

Technical specification

Mechanical properties

Chemical composition

Surface conditions



Property Value
E modulus of elasticity 206 kN/mm²
G modulus of shear 79.5 kN/mm²

Steel grades and product standards

Nearest equivalent product standards ASTM A877 D