GARBA 188L
Stainless spring wire
GARBA 188 is a general-purpose austenitic stainless steel, which is used for springs and other components requiring good fatigue resistance. GARBA 188L has a higher formability as compared to GARBA 188 due to its lower carbon content.
| C (%) | Si (%) | Mn (%) | P max. (%) | S max. (%) | Cr (%) | Ni (%) |
|---|---|---|---|---|---|---|
| 0.08 | 1.00 | 2.00 | 0.040 | 0.015 | 18.00 - 20.00 | 8.50 - 10.00 |
For round wire
| Diameter (mm) | Tolerance (mm) | Tensile Strength (N/mm²) |
|---|---|---|
| 0.30 - 0.50 | ±0.005 | - |
| 0.51 - 0.70 | ±0.008 | - |
| 0.71 - 0.83 | ±0.009 | - |
| 0.84 - 1.00 | ±0.010 | - |
| 1.01 - 1.60 | ±0.011 | - |
| 1.61 - 2.50 | ±0.014 | - |
| 2.51 - 4.00 | ±0.018 | - |
| 4.01 - 6.30 | ±0.022 | - |
| 6.31 - 8.00 | ±0.028 | - |
| 0.30 - 0.40 | 1785 - 2000 | |
| 0.41 - 0.70 | 1700 - 1910 | |
| 0.71 - 1.00 | 1650 - 1830 | |
| 1.01 - 1.50 | 1530 - 1740 | |
| 1.51 - 2.00 | 1445 - 1650 | |
| 2.01 - 2.80 | 1360 - 1570 | |
| 2.81 - 4.00 | 1275 - 1490 | |
| 4.01 - 6.00 | 1190 - 1400 | |
| 6.01 - 8.00 | 1105 - 1320 |
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.
E and G modulus of elasticity
Abt. 180 kN/mm2 in drawn condition.
Abt. 185 kN/mm2 after heat treatment.
E and G modulus of shear
Abt. 70 kN/mm2 in drawn condition.
Abt. 73 kN/mm2 after heat treatment.
Density: 7.90 kg/dm3.
Heat conductivity
| Temperature oC | 20 | 100 | 200 | 400 |
| W/(m* oC) | 15.0 | 15.5 | 17.5 | 20.0 |
Linear expansion
| Pro oC | 30-100 | 30-200 | 30-300 |
| x10-6 | 17.0 | 17.5 | 18.5 |
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. 350ºC for 0.5 - 3 hours.