Spring Steel Round Bar

Spring steel round bar refers to the special alloy steel used to manufacture various springs and other elastic components. According to performance requirements and service conditions, it can be divided into ordinary alloy spring steel and special alloy spring steel. Spring steel round bar has excellent comprehensive properties. Spring steel has excellent metallurgical quality (high purity and uniformity), good surface quality (strict control of surface defects and decarburization), and precise shape and size.

Spring steel round bar products include hot-rolled products, cold-drawn steel products, and cold-rolled steel strips. The smelting of spring steel is very important. It must ensure excellent metallurgical quality, not only to ensure accurate chemical composition, but also to have high purity, low content of sulfur, phosphorus, oxygen, nitrogen, etc., uniformity and stability of steel quality Sex is better. The metallurgical quality of spring steel should reach the level of high-quality steel and high-grade high-quality steel.
The surface quality and dimensional accuracy of spring steel round bar have a great influence on the performance and life of the spring. Because the surface of the spring steel round bar is no longer processed except for surface shot peening, it is also the working surface of the finished spring, and various defects on the original surface are also left to the spring. Therefore, the surface requirements of spring steel are extremely high, and the restrictions on decarburization, cracks, folding, scarring, inclusions, and delamination are extremely strict. Various surface defects will cause early damage to the spring and shorten its life. Taking a steel wire with a circular cross-section as an example, the strength and stiffness of the finished spring are proportional to the third and fourth powers of the steel wire diameter respectively. A small change in the diameter of the steel wire will cause a huge fluctuation in the performance of the spring, so the shape and size of the steel must be strictly controlled.

Spring steel round bar has the following characteristics:
1. High elasticity: Spring steel round steel has excellent elasticity and can return to its original shape under load, so as to achieve the purpose of absorbing energy and reducing impact.
2. Strong machinability: Due to its better plasticity and heat treatability, spring steel round steel has strong machinability in the manufacturing process and is easy to produce.
3. Good wear resistance: spring steel round steel has high surface hardness and strong wear resistance, and can withstand high pressure, wear and high temperature.

Application of spring steel round bar
Spring steel round steel is widely used, mainly used in the manufacture of mechanical parts such as springs, circlips, shrapnel, and engaging parts, as well as tools such as knives and hammers. Due to its high elasticity, plasticity and wear resistance, products made of spring steel round bar can withstand various pressures and extrusions, and maintain stable performance.

Advantages of spring steel round bar
1. Good elasticity and plasticity, suitable for the manufacture of mechanical parts that require high load and elasticity;
2. Good processability, easy to produce and process;
3. Good wear resistance, suitable for the manufacture of parts that require high wear resistance.

Spring steel round steel is a material composed of carbon steel and alloy steel, which has excellent elasticity and plasticity. It is widely used in the manufacture of springs and other mechanical parts, and has good processability and wear resistance, but it also has some shortcomings. Therefore, in actual production and application, its characteristics need to be considered comprehensively to select the most suitable material to meet specific needs.

Standards for spring steel round bars may vary from country to country. The following are spring steel round bar standards for some common countries:

Chinese standard:
GB/T 1222-2016  “Spring steel”, this standard specifies the terms and definitions of hot-rolled, forged and cold-drawn spring steel, order content, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and Quality certificate. This standard applies to spring steel round steel and square steel (hereinafter referred to as bar) with nominal diameter or side length not greater than 120 mm, spring steel flat steel with nominal width not greater than 160 mm and nominal thickness not greater than 60 mm, and spring steel flat steel with nominal diameter not greater than 120 mm. Spring steel wire rods larger than 40 mm. The grades and chemical compositions specified in this standard are also applicable to steel ingots, billets and their products.

British Standard:
BS EN 10089: Technical delivery conditions for hot rolled or forged spring steel
BS EN 10270-1: General requirements for mechanical elastic properties of spring steel

American standard:
ASTM A29/A29M: General requirements for steel
ASTM A689: Technical Requirements for Carbon Spring Steel

Japanese standard:
JIS G4801: High carbon steel wire rods for springs