What are the characteristics of St37-2G ordinary carbon structural steel?

St37-2G is a structural steel in accordance with the German standard DIN 17100, also known as ordinary carbon structural steel, which is often used in construction, machinery manufacturing and other industrial applications. The "G" represents that the steel has been galvanized, so it has better rust resistance. The chemical composition of the steel is mainly carbon, manganese and silicon, and it has good weldability and processability.

Chemical composition of St37-2G

St37-2G is a low carbon steel belonging to the ordinary carbon structural steel group. Its chemical composition plays a vital role in determining its properties and applications.

The chemical composition of St37-2G is mainly carbon, with smaller amounts of other elements including manganese, aluminum, phosphorus and sulfur. Manganese contributes to hardenability and wear resistance, phosphorus and sulfur are impurities that reduce toughness and ductility, thereby negatively affecting the quality of the steel. Therefore, their levels should be kept as low as possible during the manufacturing process. Please refer to the table below for specific chemical composition:

The chemical composition of St37-2G makes it suitable for various industrial applications such as construction equipment, machine part manufacturing, automotive industry component production, etc., as the unique mix of different elements in its structure produces excellent mechanical properties.

Mechanical properties of St37-2G

The mechanical properties of St37-2G are crucial to understanding its suitability for different applications. The steel has a yield strength of 215 MPa and a tensile strength of 360 to 510 MPa. These values indicate that St37-2G has average strength compared to other types of carbon structural steels.

In terms of elongation, the elongation at break of St37-2G is not less than 20%. This means it can deform before breaking, making it suitable for certain applications that require flexibility.

St37-2G also has good hardness and toughness, making it resistant to wear. Its Brinell hardness ranges between 135 HBW and 170 HBW, indicating that it can withstand high levels of stress without cracking or breaking.

Another important property is impact resistance, which indicates the ability of a material to resist fracture under sudden impact loads. These steels have Charpy impact test values ranging from room temperature 27 J to -20°C, making them suitable for use in cryogenic environments.

The mechanical properties of St37-2G demonstrate its versatility as a common carbon structural steel with moderate physical properties making it useful in several industries.

Characteristics of St37-2 steel

The characteristics of St37-2G ordinary carbon structural steel are as follows:

The chemical composition is simple, mainly composed of carbon, manganese and silicon, and has good weldability and processability.

With high strength and toughness, it is widely used in machinery manufacturing and other fields.

Suitable for welding, cutting, stamping, deep drawing and other processing operations under normal conditions.

After galvanized treatment, the anti-rust performance of steel can be improved and the service life can be extended.

Belongs to conventional steel, the price is relatively low, accepted by the public.

It hould be noted that St37-2G steel also has its limitations, such as it is not suitable for work in high temperature and high pressure environments, nor is it suitable for work against corrosive gases and liquids. Therefore, it is necessary to select the appropriate steel according to the actual situation in the specific application.

Heat treatment of St37-2G

Heat treatment is a process that alters the microstructure of a material to achieve desired mechanical or physical properties. For St37-2G steel, its strength and toughness can be improved by heat treatment.

The heat treatment process involves heating steel to a specific temperature range followed by rapid cooling, also known as quenching. This process results in an increase in hardness, but may also lead to brittleness in some cases.

In order to reduce brittleness and improve toughness, St37-2G can be tempered after quenching. During tempering, the steel is reheated at a lower temperature for a period of time before being cooled slowly. This process reduces internal stress and increases ductility while maintaining a degree of hardness.

It should be noted that excessive heat during quenching or tempering may cause undesirable changes in the microstructure and affect the quality of St37-2G steel.

Proper heat treatment can significantly improve the properties of St37-2G carbon structural steel for a variety of applications requiring high strength and durability.

Welding of St37-2G

St37-2G is a mild steel that can be easily welded using various welding techniques. However, it is important to note that some precautions need to be taken when welding this steel to ensure the quality and strength of the weld.

One of the most commonly used welding methods for St37-2G is gas tungsten shielded welding (GTAW), also known as TIG (tungsten inert gas) welding. GTAW produces high-quality welds with good appearance and minimal spatter.

Another popular method of welding St37-2G is shielded metal arc welding (SMAW), commonly known as stick welding or arc welding. SMAW uses a consumable electrode coated with flux, which protects the molten weld pool from atmospheric contamination and helps remove impurities from the metal.

Before starting any type of welding process, it is very important to clean any rust or oil stains on the surface. Also, preheating may be required when working with thicker sections or in cold weather conditions.

Excessive heat should also be avoided during this process as this may cause cracks in the material. To prevent this, it is best to weld intermittently rather than continuously.

Proper preparation, selection of proper materials and equipment, and following safety procedures will contribute to successful results when welding St37-2G.

Machinability of St37-2G

St37-2G steel has good machinability and is easy to process into various shapes without cracking. However, as with any carbon structural steel, machining can be challenging due to its hardness and toughness.

In order to enhance the cutting performance of St37-2G steel, it is recommended to use high-speed steel or hard alloy cutting tools. In addition, the workpiece should be properly lubricated during processing to reduce friction and heat generation.

Application of St37-2G

St37-2G ordinary carbon structural steel is widely used in various industries due to its excellent mechanical properties and chemical composition.

One of the most common applications of the St37-2G is in the construction industry for the manufacture of bridges, buildings and other infrastructure projects. Its high strength-to-weight ratio makes it an ideal material for large structures requiring durability and longevity.

Besides construction, St37-2G is also used in the automotive industry as it can be easily formed into different shapes while maintaining its strength. It is commonly used in the manufacture of automotive bodies, engine parts and other components requiring good tensile strength.

The oil and gas industry also relies on this steel because of its ability to withstand extreme temperatures and pressures. This makes it suitable for pipelines, drilling equipment, storage tanks and more.

In addition, St37-2G can also be found in machinery manufacturing, such as agricultural implements such as plows or harvesters; mining equipment, such as crushers or drills; transportation equipment, such as trains or ships; power generation systems, such as turbines or generators.