Brief Introduction of St37 Steel
St37 steel is a common structural steel, also known as 36K, from the German DIN standard, regarded as one of the most important types of steel for welding. St37-2 is a type of steel sheet under DIN standard, and it is equivalent to the Chinese Q235. St37 steel is usually supplied in hot-rolled condition in sheets, and its chemical and mechanical properties are very stable.
Chemical Composition of St37 Steel
The chemical composition of St37 steel is as follows:
Carbon: 0.17-0.20%
Phosphorus: ≤ 0.045%
Sulphur: ≤ 0.045%
Manganese: 0.50-0.80%
Silicon: ≤ 0.040%
Fatigue Strength of St37 Steel
Fatigue strength is a measure of a materials ability to resist cyclic, repeated stress, and is one of the most important properties of St37 steel. Fatigue strength can vary significantly under different conditions and between individual batches, but the average static fatigue strength of St37 steel is approximately 60MPa.
Thermal Cycles of St37 Steel
St37 steel can undergo up to 10 thermal cycles, which help to improve its hardness and yield strength. Thermal cycling involves heating the steel to its austenitizing temperature and quenching it in hot liquids to reduce its temperature and increase its hardness. The process is also known as tempering, and it helps to make the steel stronger and more durable.
Shock Strength of St37 Steel
Shock strength is the measure of a material’s ability to resist sudden, powerful impacts, and St37 steel has a high degree of shock strength. This makes it suitable for use in industrial applications where the steel may be subject to sudden impacts, such as in machinery and construction projects.
Weldability of St37 Steel
St37 steel is relatively easy to weld, as it can be easily heated and cooled. The welding process requires the use of flux, either in the form of a powder or liquid, and the use of an appropriate type of welding rod. The weldability of the steel depends on its chemical composition, so the weldability of a steel should be tested before it is used in a welding project.
Corrosion Resistance of St37 Steel
St37 steel is not as corrosion resistant as more expensive alloys such as stainless steel, but it does have a good degree of corrosion resistance. The steel should be galvanized or painted if it is going to be exposed to corrosive elements, such as moisture or chemicals.
Applications of St37 Steel
Due to its strength, durability, and relatively low cost, St37 steel is commonly used in the construction of bridges, industrial machinery, agricultural equipment, and many other structures. In addition, it is also used in the production of items such as screws, nails, and bolts.
The properties of St37 steel make it an ideal choice for a variety of applications, and the fact that it is relatively easy to work with and weld makes it a popular choice for welders. The steel is also relatively corrosion-resistant and shock-resistant, making it suitable for use in a wide range of industrial applications.
