Spring wire is a type of alloy steel that uses elements such as silicon, manganese, chromium, vanadium, and molybdenum.
Since the element carbon is used most often in it, it is known as high-carbon spring wire.
This type of spring wire has good elasticity, so that this type of property of these wires, due to the high silicon element used in the spring wire, causes its high elasticity and resilience.
Also, the presence of chromium increases the resistance of the wire to corrosion.

Classification of spring wire types

Spring wire is produced and classified into different types, which can be mentioned as follows:

High-carbon spring wire
Alloy spring wire
High-carbon spring wire
High-carbon spring wire contains 0.6 to 1.4 percent carbon by weight and is usually used in places where heat or pressure is not high, so its price is cheaper than other types. This type of wire is more durable and harder than non-alloy wires and also has high resistance to wear and corrosion, and is therefore used in the manufacture of various saw blades. Other uses include the manufacture of shock absorbers for airplane wheels, strings for musical instruments and swords, and in the woodworking, furniture, and agricultural industries.

Very important point:
The main factor determining the strength and hardness of steel is its carbon content. Of course, the presence of elements such as manganese, phosphorus, sulfur, and tungsten in high-carbon steel wire is effective.

Alloy spring wire:
This type of spring wire is used in situations where we are faced with high stresses and pressures, and due to its resistance to acidic or alkaline environments, it is used in precision instrument systems.
This category also includes tool spring wire in toolmaking and stainless springs.
For example, stainless spring wire can withstand heat up to 280 degrees Celsius.
The tool spring steel type also has high resistance to high pressures due to the presence of elements such as tungsten, cobalt, and vanadium.

Introducing a few examples of spring wire on the market:
7176 spring wire:
This high-carbon wire has high tensile strength and elasticity, and is highly resistant to corrosion.
It is used in the manufacture of items such as cylinder springs, vehicle spring suspension systems, and aircraft wheels.

8159 spring wire:
It has all the properties of 7176 spring wire, especially resistance to wear and corrosion, elasticity, with the difference that it has little ability to weld.
The reason for this is the high carbon content and the risk of cracking at the welding point.
However, it has high hardenability.
It is also used in automotive, metal rims, flat bar springs.

75CK spring wire:

75CK spring wire has very high strength and medium hardenability and is resistant to wear.
It is used in cold rolled steel belts and also in the manufacture of springs for precision instrument systems.

7103 spring steel:

7103 spring steel is part of the alloy spring wire category, which is known as 67SiCR5 among them.
Among its properties are resistance to corrosion and abrasion and is used in the manufacture of flat springs.
It has very high strength and medium hardenability and is resistant to abrasion.
It is used in cold rolled steel belts and also in the manufacture of springs for precision instrument systems.

Foolad Sanat Company produces and supplies various types of spring wire in different thicknesses.