30CrMnSiA alloy structural steel

30CrMnSiA Alloy Structural Steel

30CrMnSiA alloy structural steel is a low-alloy medium-carbon steel with relatively high strength and medium hardenability, good machinability and cold plastic strain, good weldability and medium-intensity cold deformation. It has medium-temperature strength, high overall performance. After quenching and tempering, it has higher strength and medium toughness, which is suitable for making parts with complex shape and surface quenching and tempering.

Chemical composition:

C = 0.26-0.34%; Si = 0.15-0.35%; Mn = 0.45-0.60%; S = 0.035%; P = 0.040%; Cr = 0.90-1.20%.

Heat treatment of 30CrMnSiA alloy structural steel

The 30CrMnSiA alloy structural steel is usually tempered when it is used. First, normalize at 870℃-900℃, and then temper immediately after cooling in air. The tempering temperature should be controlled between 530℃-630℃. When tempering, the tempering temperature should not be too high, and the tempering time should be selected properly according to the requirements of the mechanical properties.

Process performance

From the perspective of process performance, the 30CrMnSiA alloy structural steel has good cold-forming performance and low plasticity. The plasticity is better when the welding is performed in the normalized state and the tempered state, which is slightly lower than the commonly used free-cutting steel.

Fatigue performance

Fatigue strength value SS2541 is not lower than 248MPa, and the relatively low-temperature fatigue strength value is 235MPa. Therefore, the fatigue performance of 30CrMnSiA alloy structural steel is good.

Tensile and yield strength

30CrMnSiA alloy structural steel has a quenching and tempering tensile strength of ≥1004MPa, a yield strength of ≥785MPa, and a corresponding elongation of ≥8%.

Application of 30CrMnSiA alloy structural steel

30CrMnSiA alloy structural steel can be used to manufacture parts such as gear shafts, fasteners and transmission parts that require a certain intensity, toughness and wear resistance, as well as parts that require high fatigue strength and have a certain manufacturing cost.

Conclusion

In conclusion, 30CrMnSiA alloy structural steel is an easy-to-machine low-alloy medium-carbon steel with excellent overall performance. It has good heat treatment performance, good cold forming and welding performance, good fatigue strength, and a certain economic value. It is suitable for producing parts that require a certain intensity, toughness and wear resistance, as well as parts that require high fatigue strength and have a certain manufacturing cost.

30CrMnSiA structural steel is a kind of low-alloy structural steel. It is mainly used for processing various structural parts with medium and high strength requirements, such as lever and connecting rod for power station boiler. In practice, it can be used in equivalent temperature below 500℃. The large size containers such as vehicles and ships used in metal structural parts are usually made of 30CrMnSiA structural steel.

30CrMnSiA structural steel has high strength, good impact toughness and slightly higher hardenability. Because it is low alloy steel, 30CrMnSiA structural steel has excellent welding performance and high plasticity, so it is easy to process and form. The 30CrMnSiA steel performance indicators are superior, and the comprehensive performance is good. So 30CrMnSiA is suitable for working under capability with certain strength and large plasticity, especially for parts prone to impact and vibration, such as those with high strength, impact toughness and special welding performance requirements.

At present, in the domestic private steel enterprises, 30CrMnSiA structural steel is mainly used in the complete set of container manufacturing, vehicle and ship manufacturing, crane manufacturing, petrochemical equipment manufacturing and other industries. For example, large-sized containers such as shipbuilding use large amount of 30CrMnSiA steel. High-pressure vessel for power station is also used for small amount.

In addition to satisfactory performance, 30CrMnSiA is also characterized by its convenient processing and low cost. And it has good welding performance, so it is widely used in building structures, bridges, metal complementary parts and so on. 30CrMnSiA structural steel has a wide range of uses, covering all kinds of metal structures and links. 30CrMnSiA steel is a reliable and durable metal material, so it is widely used in national defense, shipbuilding, automobile manufacturing and other industries.