Following the trend of the auto industry to continuously achieve weight reduction, coil springs are not exempt. A consequence of the weight reduction effort is that spring materials are subject to significantly larger stresses compared to similar designs decades ago. Utilizing a higher strength of steel possesses both advantages and disadvantages. A disadvantage of subjecting materials to higher levels of stress is that a failure can be more catastrophic. As the stress level is increased, material and manufacturing quality become more critical. Material cleanliness and decar-burization that were not major issues decades ago now become significant.
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