Note for spring selection a. Hardenability To ensure the uniformity of the internal structure of the material, the material should have sufficient hardenability. Considering the quality effect of the thermoformed coil spring, Cr is added to improve the hardenability. b. Tempering characteristics Adjust the tempering temperature to obtain different hardness, but the change in tempering temperature is not only hardness, but also other properties. For example, when the retained austenite is insufficiently quenched, it exists at room temperature, and as the tempering temperature increases, the austenite decomposes. When the amount of austenite is large, the endurance is lowered, and the resistance to elasticity is deteriorated. . . Low-temperature annealing cold-formed springs generate residual stress, and low-temperature annealing is required to eliminate residual stress, improve mechanical properties and fatigue strength. Low temperature annealing temperature will reduce the tensile strength and fatigue strength of the material, so choose a suitable low temperature annealing. For example, oil quenched and tempered steel wire is annealed at 40 °C. d. Electroplating can effectively improve corrosion resistance, but hydrogen embrittlement occurs during electroplating, and dehydrogenation treatment (heating and holding at around 20 °C) is required. Hydrogen embrittlement does not easily occur on materials such as string lines. Materials quenched and tempered by oil quenching and tempering steel wire are prone to hydrogen embrittlement. e. The shot peening small metal pellet sprays the surface of the material at a high speed to form a surface strengthening layer of a certain thickness, and a high residual compressive stress is formed in the reinforcing layer, which significantly improves the durability. It has been widely used in valve springs and buffer springs. f. The low-temperature soft nitriding surface forms a soft nitriding layer, which significantly improves the durability, and is used for low-temperature soft nitriding of the valve spring to improve the surface strength while ensuring strength. 9. The effective chemical composition of the elastic resistance weakening property to improve the elastic resistance of the material is Si. The mass fraction of si in the oil tempered steel wire is 1.5%, and the buffer spring reaches 2%. In addition, by adding V to refine the crystal grains, the elasticity resistance can be improved. h. Durability Durability is affected by surface conditions (cracks, decarburization, etc.), decarburization reduces surface hardness, and thus reduces fatigue strength. To prevent decarburization, a controlled atmosphere furnace quenching heating or high frequency heating should be used.
Stellite tipped saws have shown to be able to:
•Increase run times.
•Cut with thinner kerf.
•Produce a smoother sawn surface.
•Reduce sawing variations - Better cutting accuracy. (allowing for tighter target sizes)
•Reduce the power consumption during cutting.
•Reduce the cutting downtime for saw changes and saw maintenance.
•Increased saw life due to the ability to achieve more sharpening and at longer intervals.
Stellite is also more resistant to the abrasive acids found in some woods like red cedar.
This allows the tips to stay sharp longer than carbide tips and significantly longer
than swaged saw steel when cutting unseasoned woods.
We have produced more than 100 kinds of specifications tips and export to Canada, USA,
France, New Zealand, Australia, Norway and Russia etc. more than 40 countries and areas.
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