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The difference between aluminum alloy threaded screws and screws made of other metal materials in terms of mechanical properties
The weight of aluminum screws is 1/3 of the weight of similar steel rivets. The strength characteristics of this frequently used alloy are surprisingly good. In fact, in terms of strength-to-quality ratio, aluminum screws are higher than screws made of any other industrial material. Aluminum is not magnetizable. The thermal and electrical conductivity of aluminum is very good, about 2/3 of the conductivity of copper under the same volume. Aluminum has good processing characteristics and is easy to be cold formed and hot forged.
In terms of mechanical properties, what is the difference between aluminum alloy threaded screws and screws made of other metal materials? (Guide: Standard analysis for all aspects of fastener products)
When calculating the load capacity of a part, it is necessary to determine the area of u200bu200bthe bottom part of the cross-section instead of the larger tensile stress area. Only the tensile and yield strength values u200bu200bof the mechanical test specimens given in Table 2 of ASTMF468 are the true strength values. When calculating the strength of the entire size of the screw, appropriate adjustments can be made. In this way, when multiplying the stress value and the area of u200bu200bthe threaded area by the load capacity in pounds, the calculation result is approximately the product of the true value in the table and the area of u200bu200bthe smaller tooth bottom area.
The difference in hardness of aluminum alloy is very small, and it is as meaningless as inspection criteria. As an alternative to hardness testing, shear strength testing is usually introduced.
6062-T9 type aluminum alloy (contains 0.6% silicon, 0.25% copper, 1% magnesium, 0.09% chromium, 0.5% lead, and the rest is aluminum) is almost exclusively for designing nuts and rivets. This alloy is stronger than 6061-T6 aluminum alloy and has relatively better corrosion resistance.
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