Easy cutting structural steel is a type of structural steel material with good cutting performance, widely used in mechanical manufacturing, automotive manufacturing, shipbuilding and other fields. According to different chemical composition and mechanical performance requirements, the model of free cutting structural steel also varies. Below, we will introduce several common types of free cutting structural steel.

1. 45 steel

45 steel is a type of carbon structural steel, which contains 0.42% to 0.50% carbon, 0.50% to 0.80% manganese, 0.17% to 0.37% silicon, and a small amount of phosphorus and sulfur in its chemical composition. 45 steel has high strength and toughness, and is easy to cut. Widely used in the manufacturing of mechanical parts, bearings, gears, etc.

2. 40Cr steel

40Cr steel is an alloy structural steel with a chemical composition containing 0.37% to 0.44% carbon, 0.50% to 0.80% chromium, 0.17% to 0.37% silicon, 0.80% to 1.10% manganese, and a small amount of phosphorus and sulfur. 40Cr steel has high strength and hardness, as well as good wear resistance and cutting performance. Widely used in the manufacturing of high-strength bolts, nuts, gears, etc.

3. 20CrMnTi steel

20CrMnTi steel is an alloy structural steel with a chemical composition containing 0.17%~0.23% carbon, 0.80%~1.10% chromium, 0.17%~0.37% silicon, 0.90%~1.20% manganese, and 0.03%~0.10% titanium. 20CrMnTi steel has high strength and toughness, as well as good wear resistance and cutting performance. Widely used in the manufacturing of automotive transmissions, engine gears, etc.

4. 35CrMo steel

35CrMo steel is an alloy structural steel with a chemical composition containing 0.32% to 0.40% carbon, 0.40% to 0.70% chromium, 0.17% to 0.37% silicon, 0.40% to 0.70% molybdenum, 0.15% to 0.25% vanadium, and a small amount of phosphorus and sulfur. 35CrMo steel has high strength and hardness, as well as good heat resistance and cutting performance. Widely used in the manufacturing of high-strength bolts, nuts, gears, etc.

5. 20MnCr5 steel

20MnCr5 steel is an alloy structural steel with a chemical composition containing 0.17%~0.22% carbon, 1.00%~1.30% chromium, 0.17%~0.37% silicon, 1.00%~1.30% manganese, and 0.80%~1.10% molybdenum. 20MnCr5 steel has high strength and toughness, as well as good wear resistance and cutting performance. Widely used in the manufacturing of gears, bearings, etc.

The above are several common types of free cutting structural steel, which have different chemical compositions and mechanical properties and are suitable for different engineering and manufacturing fields. Choosing the appropriate model of easy cutting structural steel can improve machining efficiency and product quality, reduce production costs, and has important economic significance.