Stamped-bent parts are decisive components in many industrial applications, particularly in spring technology. The choice of the right material for these parts, such as stamped-bent parts made of stainless steel 1.4310 or spring steel strip C75, significantly influences their performance, fatigue strength and corrosion resistance. In this article, the technical advantages of 1.4310 and C75 are examined in detail with regard to bending behavior, bending stiffness, relaxation and fatigue strength.
Bending Behavior and Bending Stiffness
Bending behavior is a decisive factor for the performance of stamped-bent parts. It describes how well a material deforms under a bending load without permanent damage such as cracks or fractures occurring. High bending stiffness and the ability to return elastically are of central importance for stamped-bent parts made of spring steel, particularly when these parts are frequently stressed.
1.4310 (Stainless Steel, Martensitic)
The material 1.4310 shows excellent bending stiffness, which means that stamped-bent parts made of 1.4310 retain their shape even under high loads. Through tempering of the material after hardening, high strength is achieved combined with good elasticity. This is particularly advantageous for applications that require repeated bending cycles without the material failing. The material also offers high relaxation resistance, which means that the stress in the spring decreases only minimally over time – an important property for spring applications that have long operating cycles.
C75 (Spring Steel Strip, Hardened)
C75 also offers high bending stiffness and strength, especially after hardening. Stamped-bent parts made of C75 are characterized by excellent restoring force, since the material structure has very high strength after hardening. The high bending stiffness of C75 ensures that stamped-bent parts retain their shape even under strong pressure and deform only minimally. In addition, C75 can be provided with a suitable corrosion coating, whereby the material increases its resistance to corrosion without sacrificing mechanical properties.
Relaxation of Stamped-Bent Parts
Relaxation describes the loss of stress in a material over time when it is under constant load. This property is decisive for the long-term performance of springs and stamped-bent parts.
1.4310 (Stainless Steel)
The material 1.4310 is characterized by low relaxation. This means that stamped-bent parts made of 1.4310 largely maintain their spring force even over long periods. In applications where the stress must remain constant over years, such as in the automotive industry or in precision mechanisms, this low relaxation is a major advantage. The material shows very stable performance, even under continuous load and different environmental conditions.
C75 (Spring Steel Strip)
C75 also shows good fatigue strength, but with somewhat higher relaxation compared to 1.4310. Nevertheless, the stress in stamped-bent parts made of C75 remains relatively stable over a long period. In applications where relaxation is not the main requirement, but rather high bending stiffness and strength are demanded, C75 is excellently suited. In addition, the corrosion protection coating can optimize the relaxation properties of C75, whereby long-term performance is improved even in corrosive environments.
Fatigue Strength and Fatigue
Fatigue strength is a key component for the service life of stamped-bent parts, particularly when these are regularly loaded and unloaded, as is the case with springs.
1.4310 (Stainless Steel)
The high fatigue strength of stamped-bent parts made of 1.4310 makes this material ideal for applications that are exposed to constant mechanical loads, particularly in environments with corrosive influences. Through the martensitic structure and the excellent corrosion resistance, 1.4310 remains stable even after many cycles in heavily stressed areas and shows only slight signs of material fatigue. This is particularly advantageous for springs that are used in aerospace, automotive and medical technology.
C75 (Spring Steel Strip)
Spring steel strip C75, particularly after hardening, also offers high fatigue strength. This material can withstand high repeated loads over years in many industrial applications, which makes it a preferred choice for stamped-bent parts that are exposed to high mechanical stress. With the right surface treatment, such as a corrosion coating, the fatigue strength of C75 can be further increased, so that it can be used in a wide variety of environments without significant performance loss.
Corrosion Resistance and Surface Treatment
1.4310 (Stainless Steel)
One of the greatest advantages of stamped-bent parts made of 1.4310 is the excellent corrosion resistance. The material is ideal for use in damp or chemically stressed environments, since it will not rust or corrode, which makes it a preferred material for applications in the food industry, medical technology and the chemical industry.
C75 (Spring Steel Strip)
Although C75 is by nature less corrosion-resistant than stainless steel 1.4310, it can also be used in corrosive environments through a suitable surface treatment, such as galvanizing or coating with corrosion protection materials. These corrosion protection measures make it possible to use stamped-bent parts made of C75 in a wide variety of industries where a lower price compared to stainless steel 1.4310 is desired, without impairing the performance of the parts.
Conclusion: Choosing the Right Material for Stamped-Bent Parts
The choice between 1.4310 (stainless steel) and C75 (spring steel strip) for stamped-bent parts depends significantly on the specific requirements of the application. If corrosion resistance, low relaxation and a long service life are required, 1.4310 is the preferred choice, since it offers stable performance in aggressive environments. C75, with its high bending stiffness and strength, is an excellent choice for applications where high mechanical loads are required without immediate requirements for corrosion resistance. With a corrosion coating, the durability of C75 can also be significantly improved, whereby this material remains an attractive option for price-conscious applications.
Both materials offer outstanding performance for stamped-bent parts in their respective strengths, and the choice of material should always take into account the requirements for bending behavior, fatigue strength and environmental conditions.