St70 steel

Types of ST70 Steel

The following structural steels with different properties and applications frequently serve as ST 70 steel.

• ST 37-2

  ST 37-2 is a German standard (DIN 17100) structural steel grade. The low-carbon steel offers excellent weldability and good formability. Commonly used in structural applications, ST 37-2 is applicable in construction and manufacturing.

• ST 44-2

  ST 44-2 is a medium-carbon structural steel. This steel provides higher strength than ST 37-2 while still being weldable and formable. Often used in medium-load structural applications, ST 44-2 is preferred in construction and engineering works.

• ST 52-3

  ST 52-3 is a high-carbon structural steel. It features superior strength and abrasion resistance. In addition, it has good weldability and worksability. This steel is ideal for heavy-duty applications used in manufacturing components for mechanical engineering and construction.

• Q235

  Q235 is a Chinese standard carbon structural steel equivalent to low-carbon steels like ST 37. Also, it has good weldability and versatility. Commonly used in construction, it serves as a primary material for making structural components.

• S235

  It is a European standard structural steel (EN 10025). This steel grade has similar properties to ST 37 and Q235. Usually, it is applicable in low to medium-load structures in construction and engineering projects.

Features of ST70 Steel

ST70 steel has many desired features in multiple industrial applications.

• High strength

  ST70 steel is renowned for its exceptional strength. It allows the production of thinner and lighter materials without compromising structural integrity. Also, it is elevated yield strength, about 350 MPa (megapascals) makes it ideal for heavy loads and high-stress conditions.

• Toughness and hardness

  Users benefit from ST70 steel's toughness and hardness. Toughness guarantees the steel's performance in extreme conditions. Hardness, on the other hand, makes it resistant to wear and tear. As a result, it is applicable in heavy machinery components.

• Good weldability

  Although it has a high strength, ST70 steel is easily weldable. Low carbon content ensures a smooth welding process without cracking. This makes it easy to assemble complex structures on-site.

• Formability

  Formability allows easy shaping during manufacturing processes. Users shape the steel into various configurations. Common forms include beams, plates, and frames to cater to diverse construction needs. Generally, it enables manufacturers to meet design specifications seamlessly.

• Durability

  Durability provides resistance to deformation under stress. Also, it resists fatigue and serves well in demanding environments. The combination of high tensile strength and further durability makes it ideal for long-lasting and reliable performance in harsh conditions.

How to Choose ST70 Steel

Select the appropriate ST70 steel by considering multiple factors. These factors include the application requirements, the operating environment, and the desired mechanical properties.

• Mechanical properties

  Consider the mechanical properties required for the target application. Some of these properties include tensile strength, hardness, and impact resistance. While ST70 steel is strong, other steel grades like ST52-3 and S235 may be applicable for more enhanced tensile strength and elongation.

• Welding and fabrication requirements

  Evaluate the fabrication process as well as the methods that will be used to join the steel. Although ST70 steel has good weldability, it may have slightly reduced workability compared to lower carbon structural steels.

• Cost and availability

  The cost of the steel grade and its availability influence the choice of ST70 steel. Some common steel grades like ST70 have high availability. Therefore, they are often more affordable. Also, consider the long-term value of the steel as it will affect the overall performance and durability.

• Environmental conditions

  Assess the operating environment where the structure will be used. ST70 steel is corrosion-resistant and ideal for high-load applications. Therefore, users commonly use it in construction and manufacturing. However, it may not be suitable for highly corrosive environments. Thus, opting for a corrosion-resistant grade like galvanized or stainless steel will come in handy.

• Regulatory compliance

  Lastly, ensure that the chosen steel grade complies with relevant industry standards and regulations. Get to know the specific requirements within your sector. This will help in deciding if suitable steel grades like the ST70 steel have met the required standards.

How to Use ST70 Steel

Properly using and maintaining ST70 steel prolongs its life and optimizes its performance. Common applications of the steel include construction, manufacturing, and automotive industries.

• Cutting

  Manufacturers usually cut the ST70 steel into required shapes and sizes using torch cutting, plasma cutting, or laser cutting. The choice of the cutting method often depends on the thickness of the steel. For thinner sections, plasma or laser cutting will suffice. However, for thicker plates, users prefer oxy-fuel cutting.

• Forming

  It is common for users to form the steel using methods like bending, rolling, or stretching to achieve desired shapes. For instance, they may create steel beams or plates for the structure. Generally, due to its high strength, manufacturers ensure that they apply enough force when forming to prevent cracking.

• Joining

  Welding comes in handy when assembling components made of ST70 steel. Although it has a high carbon content, this steel has good weldability. So, users use MIG welding, TIG welding, or stick welding to join the steel pieces. Nonetheless, they first clean the joint area to remove dirt, rust, and other contaminants. They then preheat the steel to minimize potential heat distortions.

• Coating and protection

  Applying a protective coating on the steel is common for users who expose the steel to corrosive environments. They may apply zinc coating, paint, or corrosion inhibitor. These coatings create a barrier that prevents moisture and chemicals from degrading the steel.

• Maintenance

  Inspecting the ST70 steel structure or component regularly helps in identifying any signs of wear, rust, or fatigue. The maintenance mostly depends on the particular application of the steel. For example, in the construction industry, users examine the steel for bends or misalignments. They also check for signs of corrosion. On the other hand, for mechanical parts in the manufacturing industry, users look for surface wear and tear and replace worn-out components as necessary.

Q & A

What is the difference between carbon steel and alloy steel?

Carbon steel consists of varying carbon contents and other trace elements. These help improve the strength and hardness of the steel. On the other hand, manufacturers add other alloying elements such as manganese, silicon, and nickel to alloy steel. This enhances its corrosion resistance, toughness, and overall durability.

What are the benefits of low-alloy steel?

Low-alloy steel has great machinability, excellent weldability, and enhanced hardening. Also, it offers better corrosion resistance and higher fatigue resistance. Lastly, it is more cost-effective. This is because it requires less alloying material while offering different applications.

What is the difference between mild steel and carbon steel?

Mild steel is low-carbon steel with a carbon content of about 0.05 to 0.15%. This makes it workable and ductile. On the other hand, carbon steel may come with varying carbon contents. Therefore, it can range from low to high carbon content. This influences the overall strength and hardness of the steel. In this case, mild steel refers to a type of low-carbon variety of carbon steel.