1045/45# CARBON STEEL

Chemiscal composition：

Heat Treatment:

1. anneal

- Objective: To reduce hardness and improve machinability.

- Process: heating to 800-850°C, slowly cooling after holding.

2. normalizing

- Objective: refine grain and uniform structure.

- Process: heating to 850-900°C, cooling in the air after holding.

3. quench

- Purpose: To improve hardness and strength.

- Process: heating to 820-860°C, rapid cooling after holding (water quenching or oil quenching).

4. temper

- Objective: To eliminate quenching stress and improve toughness.

- Process: Heating to 150-200°C (low temperature tempering) or 400-600°C (high temperature tempering) after quenching, cooling after holding.

5. tempering

- Objective: To obtain good comprehensive mechanical properties (strength, toughness).

- Process: tempering at high temperature after quenching (500-650°C).

The specialty of the steel:

45 Carbon steel is a medium carbon steel that has the following characteristics:

- Medium strength: moderate strength and hardness after proper heat treatment.

- Good machinability: suitable for machining.

- Certain wear resistance: suitable for moderate wear conditions.

- Good toughness: While maintaining strength, it has a certain toughness.

- Weldability: The welding performance is general, requiring preheating and post-welding heat treatment.

Main uses:

45 Carbon steel is widely used to manufacture parts that require moderate strength and wear resistance. Typical applications include:

- Shaft parts: such as drive shaft, spindle, etc.

- Gear: such as medium-load gear.

- Bolts and nuts: such as bolts and nuts of medium strength.

- Mechanical parts: such as connecting rods, pins, etc.

- Tools: hammers, wrenches, etc.