The composition of the steel in the spring steel strip affects its fatigue performance

With the continuous development of various industries, the requirements for the selection of raw materials for manufacturing product components are becoming increasingly high. Industries such as automotive, mechanical manufacturing, and electrical equipment have stricter requirements for elastic parts, and spring steel strips can well meet the manufacturing needs of these industries' parts. Spring steel strips mainly include hot-rolled round steel, square steel, flat steel, and spring steel materials with irregular cross-sections. Let's learn about spring steel strips with the editor below.

Spring steel strips are widely used in diamond saw blades and tobacco machine springs Blade Mud board Putty knife. Automotive clutch steel plates Measuring tools Stationery. Band saw chain Retaining ring Tape measure Hairpin. Shoe iron material Stamped steel plates and bracket springs are used for horns in the mechanical, electronic, automotive, construction, and hardware industries.

The surface of the spring steel strip is bright, with high flatness and uniform thickness. The material can be stamped, heat-treated, and electroplated. Spring steel strip can provide customers with free precision slitting.

The content and function of carbon and alloying elements in steel are as follows:

Generally, carbon spring steel with WC=0.6%~0.9% and alloy spring steel with WC=0.45%~0.70% are used for medium and high carbon springs. After quenching and medium temperature tempering, a tempered martensite structure is obtained, which can better ensure the performance requirements of the spring.

2. Alloy spring steel for general use is generally low-alloy steel. The main added elements of Shenzhen spring steel strip are Si, Mn, Cr, etc. Its main function is to improve hardenability, solid solution strengthen the matrix, and enhance tempering stability; The auxiliary elements are strong carbide forming elements such as Mo, W, V, etc. Their main functions are to prevent decarburization defects caused by Si, overheating defects caused by Mn, and improve tempering stability and heat resistance.

Performance requirements for manganese steel strip

1. High elastic limit σ e and yield strength ratio σ s/σ b to ensure excellent elastic performance, i.e. absorbing a large amount of elastic energy without plastic deformation;

2. High fatigue limit, spring steel strip fatigue is one of the main forms of spring failure, and fatigue performance is mainly affected by the metallurgical quality of the steel (such as non-metallic inclusions) and the surface quality of the spring (such as decarburization), in addition to the composition and structure of the steel;

3. Sufficient plasticity and toughness to prevent impact fracture;

4. Other properties, such as good heat treatment and plastic processing performance, heat resistance or corrosion resistance requirements for working under special conditions, etc.

Spring steel should have excellent comprehensive properties, such as mechanical properties (especially elastic limit, strength limit, yield strength ratio), anti elastic reduction performance (i.e. anti elastic reduction performance, also known as anti relaxation performance), fatigue performance, hardenability, physical and chemical properties (heat resistance, low temperature resistance, corrosion resistance, etc.).