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Suspension Spring: Function and Significance

Suspension springs play a crucial role in the automotive and industrial sectors, serving as pivotal components that contribute to the overall performance and safety of various applications. These springs are designed to absorb and dampen shocks, vibrations, and fluctuations, providing a smoother and more stable ride or operation.


Suspension Spring Raw Materials

Suspension springs primarily use spring steel, including Si-Cr, Cr-Mn, Si-Mn, and Si-V series.

  • Si-Cr Steel: Common in passenger cars, known for excellent stability, high relaxation resistance, and ideal fatigue lifespan. Mainstream varieties include 55SiCr and 55SiCrV.
  • Si-Mn & Cr-Mn Steel: Widely used, with 60Si2MnA and 55CrMn as popular choices. Affordable alternatives for crafting lower-stress suspension springs, constituting about 30% of hot-rolled springs.
  • High Hardenability Steel: 55SiVB (e.g., EQ140 leaf springs) faces reduced usage due to higher cost and hardness. Larger leaf springs, like EQ153, now use 60CrMnB steel.
  • Phasing Out: Cr-V steel, especially 50Cr-V (SUP10), is gradually exiting the scene.
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Suspension Spring Design

Stress Design: Recent advancements focus on reducing suspension spring weight by 25% through high-stress, lightweight design. New car springs surpass 1100MPa stress, demanding additional reinforcement methods. International models prioritize high-stress, lightweight designs, while domestic models emphasize cost-effectiveness.

Shape Design: Towards the late 20th century, eccentric “S” shaped springs gained popularity in models like POLO and Focus. This design aligns force vectors with shock absorber movement, reducing lateral force impact. However, its complex manufacturing and uneven stress distribution limit domestic usage.

Variable Cross-Section Design: Rear suspension springs, aiming for more space, adopt a variable concave shape or “MINIBLOCK” design. These springs provide high compressive strength with minimal height, optimizing rear-seat and trunk space.


Enhancing Suspension Spring Strength

Suspension springs, post cold and hot forming, undergo crucial heat treatment. Optimal hardenability, around 80% martensite at the cross-section center, ensures high fatigue strength and impact toughness. Hardenability dictates the maximum thickness achievable for springs.

Traditional spring steel falls short for evolving automotive needs. Spring steel’s mechanical properties, contingent on material quality, hinge on heat treatment tailored to the specific material. Strengthening spring steel involves maximizing alloy effects through targeted heat treatment.

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Hootai Spring Factory - Your Trusted Partner for Suspension Springs

Welcome to Hootai Spring Factory, a dedicated and reliable manufacturer specializing in Suspension Springs. We pride ourselves on being experts in the field, committed to delivering outstanding spring solutions tailored to your unique applications. With a focus on professionalism and reliability, we strive to provide you with top-notch products that meet and exceed your expectations. Trust Hootai Spring Factory for excellence in Suspension Spring manufacturing – your go-to partner for reliable and specialized spring solutions.

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