GARBAFLEX CrSi91

Flat and shaped wire for surface nitriding

GARBAFLEX CrSi91 is especially intended for application requiring extremely high fatigue properties and good relaxation properties at increased working temperatures.

Chemical composition

C (%) Si (%) Mn (%) Cr (%) V (%) Mo (%) P max. (%) S max. (%)
0.50 - 0.70 1.80 - 2.20 0.30 - 0.60 0.80 - 1.00 0.05 - 0.15 0.05 - 0.15 0.020 0.020

Mechanical properties

For flat rolled wire

Width (mm) Tolerance (± mm)
1.00 - 5.00 0.050
5.01 - 8.00 0.070
8.01 - 10.00 0.100
Thickness (mm) Tolerance (± mm)
0.30 - 0.80 0.013
0.81 - 1.00 0.019
1.01 - 1.60 0.025
1.61 - 2.30 0.050

For shaped wire

Width (mm) Tolerance (± mm)
- 1.50 0.020
1.51 - 3.00 0.030
3.01 - 5.00 0.040
5.01 - 7.00 0.050
7.01 - 0.060

Microstructure

Tempered martensite with no ferrite.

Execution

Rolled on 2 sides (flat).
Rolled on 4 sides (shaped).
Profile drawn (shaped).

Camber

Max. 4 mm measured on 1 m length.

Coil set

Max. 20 mm measured on 1 m length.

Surface conditions

Surface

Bright or oxide.
Surface defects max. 1% of thickness.

Physical properties

E and G modulus of elasticity

206 kN/mm²

E and G modulus of shear

79.5 kN/mm²

Recommendations

Soft shot peening

Before the nitriding process a soft shot peening process shall be applied in order to remove the oxide layer on the spring wire surface.

Nitriding

GARBAFLEX CrSi91 should be nitrided to obtain optimum fatigue and relaxation properties. Our recommendation is gas nitriding.

Additional

Additional information

Decarburisation
No total decarburisation. Partial decarburisation (no continuous zones) max. 1.2% of a corresponding round wire dimension.