Non-quenched and tempered alloy structural steel

Non-Alloy Structural Steel

Non- Alloy Structural steel is a type of steel that does not contain significant amounts of alloying elements, such as copper, chromium or nickel, which are added to achieve specific properties. Non-alloy structural steels are used for structural applications where strength, toughness and wear resistance are not the primary considerations.

Non-alloy structural steel is usually tuned to have low carbon content. This allows for a balanced combination of strength and ductility in the as-fabricated material. It also minimizes the tendency for the material to crack during application, allowing for a longer lasting and more efficient part.

Non-alloy structural steel can be classified into two basic types: hot rolled and cold rolled. Hot rolled is used when the steel is heated above its recrystallization temperature while cold rolled is used when the steel is cooled.

Hot rolled non-alloy steel has higher mechanical properties than cold rolled steel. This results in higher strength and increased durability, as well as greater resistance to fatigue and impact. Hot rolled non-alloy steel is also easier to machine due to its greater malleability, making it more cost-effective to produce complex machinery.

Cold rolled non-alloy steel, however, offers improved surface qualities, tolerance, and repeatability. These properties make it ideal for applications that require a high degree of accuracy, such as machine tools, automotive components, and medical instruments. Cold rolled non-alloy steel can also be hardened for increased strength and wear resistance.

Compared to alloy steels, non-alloy steels typically offer higher yield strength, greater corrosion resistance, greater machinability, and improved ductility. They are also usually less expensive.

Non-alloy structural steel is widely used in the construction, automotive, medical, and aerospace industries. It is used to make frames, beams, and other structural components. Applications include bridges, stadiums, storage tanks, and railway carriages.

Non-alloy structural steel is an affordable and versatile material choice. It is resistant to wear and has excellent strength-to-weight ratio. While it may not be suitable in some applications, it offers a cost-effective and reliable material choice for many applications.

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Non-quenched and tempered alloy structural steels refer to alloy structural steels that have not been quenched and tempered after rolling. These steels have higher strength than ordinary low alloy structural steels, but their toughness and plasticity are not so good. It is applicable to steel structures such as railway vehicles, bridges, pressure vessels and various structural parts that bear dynamic loads.

The main features of non-quenched and tempered alloy structural steels are: its strength is generally on the low side, and its higher yield ratio makes it more suitable for parts with large plastic deformation requirements, such as railway vehicle axles, bridge cranes, steel bridges, vehicles and other structures.

Non-quenched and tempered alloy structural steels have higher strength than ordinary low alloy structural steels, but the weldability is slightly lower than that of ordinary low alloy structural steels. Therefore, when welding, measures should be taken to improve its welding performance, such as increasing the pre-heating temperature before welding, using high strength low alloy welding rods and using small welding beads.

Due to its small impact toughness, non-quenched and tempered alloy structural steels are generally not suitable for parts with large impact forces or structures used in extremely cold areas. The quenching treatment of non-quenched and tempered alloy structural steels can improve the strength and toughness of the material, so that it can be widely used in various fields.