High-strength low-alloy niobium-vanadium structural steel (ASTM AS72/AS72M-1997)

介绍高强度低合金铌钒结构钢

High strength low alloy steel, especially Ni-V structural steel, is a type of steel that has been in use for many decades. Since its introduction in the mid-twentieth century, the use of Ni-V structural steel has grown exponentially in the industrial, automotive and aerospace sectors.

The high-strength low-alloy steel (HSLA) often referred to as Ni-V is a combination of low-alloy and very high strength materials. This type of steel contains elements such as vanadium, niobium, chromium and other alloying components. The alloying elements are added in varied amounts, resulting in a steel with a distinct balance of strength, ductility, toughness and fatigue resistance. The low-alloy steel is also highly resistant to corrosion and can be used to create a myriad of products with rigorous specifications, even in extreme environments.

The ASTM A572/A572M-97 is a high-strength, low-alloy steel. This alloy is composed of three elements along with a very limited amount of chromium and zirconium and thus is classified as an HSLA steel. The major elements in the ASTM A572/A572M-97 include iron, nickel and vanadium. In addition, small amounts of chromium, zirconium, titanium, and manganese are present. The steel is typically made with a martensitic microstructure, creating higher mechanical properties and higher hardness than other grades of steel including Type 111 and Type 422 stainless steel.

The ASTM A572/A572M-97 is a versatile steel having a wide range of applications. This grade of steel is especially suited for use in the manufacturing of bridge members, aircraft structures, heavy equipment components, and armor. This steel is ideal for these applications due to its high mechanical strength, good ductility, weldability, and impact resistance. Its high strength to weight ratio makes it a great choice for structures that require a lightweight steel option. Additionally, the ASTM A572/A572M-97 is resistant to both atmospheric and saltwater corrosion, making it ideal for offshore or coastal structures.

The general fabrication of the ASTM A572/A572M-97 steel is straightforward and can be used with a wide range of welding processes. Fabrication welds can be done using either shielded metal arc welding (SMAW), gas metal arc welding (GMAW), flux cored arc welding (FCAW), or gas tungsten arc welding (GTAW) processes. Because of its high strength, welders should ensure that they use the appropriate weld joint design to ensure the quality of the weld.

In conclusion, the ASTM A572/A572M-97 is a high strength, low alloy steel. It has a high strength to weight ratio, allowing for the fabrication of lighter weight structures. It also has excellent weldability as well as good corrosion resistance for use in harsh environments. This steel is ideal for use in the manufacturing of bridge members, aircraft structures, heavy-duty equipment components and armor.

ASTM A572/A572M-1997 is a high-strength, low-alloy manganese-vanadium structure steel. This standard defines chemical and mechanical properties of the specified material.

A572/A572M-1997 is typically used in a wide variety of applications, including cranes, bridges, buildings, construction equipment, and many other structures requiring increased strength and corrosion resistance. This material is also suitable for use in pressure vessels and other storage tanks, where improved corrosion resistance is necessary.

Chemical composition for A 72/A72M-1997 is Manganese, 0.80 – 1.35%; Silicon, 0.40 – 0.50%; Chromium, 0.15-0.45%; Nickel, 0.30 - 0.50%; Molybdenum, 0.06 -0.15%; Vanadium, 0.06 - 0.15%; Phosphorus, 0.045 - 0.060%; Sulfur, 0.05 - 0.15%; and other trace elements. Mechanical properties of this steel include tensile strength of 65-95 KSI (ksi = 1000 pounds per square inch). Yield strength of 65-91 KSI and elongation in 2” of 16%. A572/A572M-1997 also has a minimum Brinell hardness of 136.

A572/A572M-1997 is a versatile and popular material and is used in a variety of applications in the construction and other industries. It is corrosion resistant and has good strength, making it suitable for heavy structures and pressure vessels. Its chemical composition and mechanical properties make it an excellent choice for use in applications that require increased strength and corrosion resistance.