1.What are the performances of Q235 material round bars?
Strength and toughness: The yield strength is about 235MPa, with moderate strength, good toughness, strong plastic deformation ability, and suitable for bearing general loads.
Weldability: The carbon content is low (≤0.22%), the welding performance is excellent, and it is not easy to produce cracks during welding. It is often used for structural parts that require on-site welding (such as building supports and ordinary guardrails).
Corrosion resistance: The galvanized layer can effectively prevent corrosion, but the corrosion resistance of the substrate itself is average. It performs well in humid or slightly corrosive environments and is not suitable for strong acid and alkali environments.
Application scenarios: building structures, ordinary mechanical parts (such as bolts and nuts), and light industrial products (such as furniture frames).
2.What is the performance of galvanized round bars made of Q345 material?
Strength and toughness: Yield strength ≥ 345MPa, about 40% higher than Q235, higher tensile strength, better toughness and impact resistance, suitable for bearing large loads and dynamic stresses (such as bridges and crane structures).
Weldability: Contains a small amount of alloying elements (such as Mn and Si), good weldability, but attention should be paid to controlling the welding process (such as preheating temperature) to avoid cold cracks.
Corrosion resistance: The substrate's resistance to atmospheric corrosion is slightly better than Q235, and the corrosion resistance is further improved after galvanizing, which is suitable for outdoor heavy equipment (such as highway guardrails and transmission towers).
Application scenarios: bridge engineering, large mechanical structures, pressure vessels, and shipbuilding.
3.What is the performance of 45# steel (medium carbon steel)?
Strength and toughness: The carbon content is about 0.45%. After quenching and tempering, the strength (tensile strength ≥ 600MPa) and hardness are significantly improved. The toughness is moderate, which is suitable for parts that require wear resistance and high strength.
Processing performance: It can be subjected to heat treatment such as quenching and tempering. The surface hardness can reach HRC40-45, but the weldability is poor (prone to cracks), and it usually requires preheating before welding and heat preservation after welding.
Corrosion resistance: The corrosion resistance of the base material is similar to that of Q235. After galvanizing, it mainly relies on the zinc layer for corrosion protection. It is suitable for mechanical parts rather than strong corrosive environments.
Application scenarios: Mechanical shafts (such as machine tool spindles), gears, high-strength bolts, and automobile transmission shafts.
4.What are the properties of 20CrMnTi (carburizing steel) round bars?
Strength and toughness: Contains alloy elements such as Cr, Mn, and Ti. After carburizing and quenching, the surface hardness is high (HRC58-62), the core toughness is good, and it has both wear resistance and impact resistance.
Heat treatment performance: The carburizing process can form a high-hardness wear-resistant layer on the surface, and the core maintains toughness, which is suitable for parts that bear alternating loads and friction (such as gears and bearing sleeves).
Corrosion resistance: The corrosion resistance of the base material is general. After galvanizing, it is used in composite scenarios that require wear resistance and corrosion resistance (such as agricultural machinery gears and mining machinery parts).
Application scenarios: Automobile gearbox gears, tractor transmission parts, and engineering machinery wear-resistant parts.
5.What is the performance of GCr15 (bearing steel) round bars?
Strength and toughness: Carbon content is about 1.0%, Cr content is 1.5%, extremely high hardness after quenching (HRC61-65), excellent wear resistance, high contact fatigue strength.
Special properties: Mainly used for manufacturing rolling bearings, and can also be used as high-precision wear-resistant parts (such as screws and guide rails). After galvanizing, it can prevent bearings from rusting in humid environments.
Application scenarios: bearing rollers, rings, precision measuring tools, wear-resistant molds.