Bedding Spring Wire
Liberty Steel manufactures a wide range of Hard Drawn Bedding Spring Wires. These wires can be manufactured to Australian Standard AS 2266 - Carbon Steel Spring Wire for Bedding and Seating, or the customer's own specialised requirements.
Liberty Steel’s TruForm™ Spring has been developed to suit most types of bedding spring machines, including the latest high-speed computer controlled machines. It features tight tolerances on both diameter and tensile specifications and has the potential to deliver the cost savings and reliability needed in a globally competitive market.
Wire suitable for furniture spring is also available.
Diameter Tolerances
| Nominal Diameter | Tolerance |
| 1.30mm to 2.42mm TruForm™ Spring | + 0.00mm +/- 0.02mm |
| Equal and above 2.50mm up to and including 3.94mm | +/- 0.02mm |
| 4.00mm | +/- 0.03mm |
| 5.00mm | +/- 0.04mm |
Tensile Strength (MPa)
Tensile strength is defined as the maximum load achieved in the tensile test, divided by the cross-sectional area of the wire test piece. Liberty Steel produces a variety of tensile ranges for Bedding Spring Wire, but all fall within the range of 1340 - 2050MPa. TruForm™ Spring products have a tensile range of 150MPa while other products conform to AS 2266.
Steel Chemistry
Liberty Steel uses a variety of steel grades to achieve the tensile specifications for Bedding Spring Wire. Carbon content is varied to achieve the desired result.
| Element | % |
| Carbon | 0.50/0.71 |
| Phosphorus | 0.03max |
| Manganese | 0.60/0.80 |
| Silicon | 0.15/0.35 |
| Sulphur | 0.03max |
