GARBA 1812Mo

Stainless spring wire

GARBA 1812Mo is an austenitic stainless steel, which as compared to GARBA 178Mo offers a higher resistance against intergranular corrosion due to lower carbon content. The higher content of molybdenum also increases the resistance against general corrosion.

Chemical composition

C (%) Si (%) Mn (%) P max. (%) S max. (%) Cr (%) Ni (%) Mo (%)
0.07 1.00 2.00 0.045 0.015 16.50 - 18.50 10.00 - 13.00 2.00 - 3.00

Mechanical properties

For round wire

Diameter (mm) Tolerance (mm) Tensile Strength (N/mm²)
0.30 - 0.65 ±0.008 -
0.66 - 1.01 ±0.010 -
1.02 - 2.26 ±0.015 -
2.27 - 4.01 ±0.020 -
4.02 - 6.26 ±0.025 -
6.27 - 8.00 ±0.030 -
0.30 - 0.40 1675 - 1930
0.41 - 0.50 1650 - 1900
0.51 - 0.65 1625 - 1870
0.66 - 0.80 1600 - 1840
0.81 - 1.00 1575 - 1810
1.01 - 1.25 1550 - 1780
1.26 - 1.50 1500 - 1730
1.51 - 1.75 1450 - 1670
1.76 - 2.00 1400 - 1610
2.01 - 2.50 1350 - 1550
2.51 - 3.00 1300 - 1500
3.01 - 3.50 1250 - 1440
3.51 - 4.25 1225 - 1410
4.26 - 5.00 1200 - 1380
5.01 - 6.00 1150 - 1320
6.01 - 7.00 1125 - 1290
7.01 - 8.00 1075 - 1240

Surface conditions

Surface performance
AC-surface 0.30–8.00 mm Ø. The AC-coating can be removed before heat treatment by using a 10-20% nitric acid pickle at room temperature.

Physical properties

E and G modulus of elasticity

Abt. 175 kN/mm2 in drawn condition.
Abt. 180 kN/mm2 after heat treatment.

E and G modulus of shear

Abt. 68 kN/mm2 in drawn condition.
Abt. 71 kN/mm2 after heat treatment.
Density: 8.00 kg/dm3.

Heat conductivity

Temperature oC 20 100 200 400
W/(m*oC) 13.5 14.5 15.5 18.5

Resistivity

Temperature oC 20 100 200 400
nΩm 750 800 850 1000

Linear expansion

Pro oC 30-100 30-200 30-400
x10-6 16.5 17.0 18.0

Specific heat capactity

Temperature oC 20 100 200 400
J/(kg*oC) 440 480 520 560

Recommendations

Heat treatment

As soon as possible after coiling, the springs should be stress relieved.
Recommended temperature for compression springs or tension springs without initial tension is approx. 420 ºC for 0.5 - 4 hours.