Spring Steel
Spring steel is a type of alloy steel that has excellent elasticity and resilience properties. It is often used in the manufacturing of various machine parts that require substantial strength and flexibility. Spring steel has a unique ability to regain its original shape after being bent or twisted, making it an ideal material for applications that need repeated use or constant pressure.
One of the most significant advantages of spring steel is its high yield strength, which makes it incredibly efficient in handling large amounts of stress without losing its structural integrity. Therefore, spring steel is commonly used in the manufacturing of various springs that are used in different types of machines such as cars, airplanes, and heavy machinery. Its durability and excellent performance over an extended period also make it a popular choice in making various tools and equipment.
Spring steel is also highly resistant to both rust and corrosion. This resilience and durability make it the ideal choice of metal for manufacturing items that need to withstand harsh and hostile environments. Many industries such as aerospace, automotive, and tool making depend on spring steel to provide them with a reliable and durable material that can perform under various conditions.
In addition to its mechanical and physical properties, spring steel is also highly versatile and customizable, making it ideal for a wide range of applications. It is available in different grades and specifications, allowing engineers and manufacturers to tailor it to meet their specific needs.
Designation by Standards
| Brand Name | Ravne No. | Mat. No. | DIN | EN | AISI |
| VCV150 | 732 | 1.8159 | 50CrV4 | 50CrV4 | 6145/6150 |
Chemical Composition (in weight %)
| C | Si | Mn | Cr | Mo | Ni | V | W | Others |
| 0.51 | max. 0.40 | 0.90 | 1.05 | - | - | 0.18 | - | - |
Applications
Permanently stressed machine, engine and vehicle parts when high strength and toughness are required.Most severely stressed springs for trucks, torsion springs.
Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.84
Soft Annealing
Heat to 640-720oC, cool slowly. This will produce a maximum Brinell hardness of 248.
Normalizing
Temperature: 840-880oC.
Hardening
Harden from a temperature of 820-860oC followed by oil quenching.
Tempering
Tempering temperature: 540-680oC.
Mechanical Properties in Hardening and Tempering Condition
| Diameter (mm) | 0.2 % proof stress (N/mm2) | Tensile strength (N/mm2) | Elongation (%) | Reduction of area (%) | Notch impact energy (ISO-V) (J) |
| <16 | 900 | 1100-1300 | 9 | 40 | 30 |
| 17-40 | 800 | 1000-1200 | 10 | 45 | 30 |
| 41-100 | 700 | 900-1100 | 12 | 50 | 30 |
| 101-160 | 650 | 850-1000 | 13 | 50 | 30 |
| 161-250 | 600 | 800-950 | 13 | 50 | 30 |
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