I. Classification Methods for Carbon Steel Castings

Carbon steel castings can be regarded as the "basic raw materials" in the industrial sector. Based on carbon content, they fall into three categories: low-carbon steel (carbon content ≤ 0.25%), medium-carbon steel (0.25%–0.6%), and high-carbon steel (≥ 0.6%).

• Low-carbon steel: Excellent ductility, widely used for components requiring welding or stamping.
• Medium-carbon steel: Balanced strength and toughness, suitable for mechanical transmission parts.
• High-carbon steel: Outstanding hardness, primarily applied to wear-resistant components.

II. Core Elements of Technical Specifications

The technical requirements for such castings are comparable to cooking recipes, with four key aspects to observe:

1. Chemical composition control: Sulfur and phosphorus contents must be precisely regulated like seasonings.
2. Mechanical properties: Indicators including tensile strength and elongation shall meet specified standards.
3. Defect limitations: Strict proportional limits are imposed on flaws such as porosity and slag inclusions.
4. Heat treatment processes: Procedures like normalizing and annealing determine the final product quality.

III. Typical Application Scenarios & Precautions

Carbon steel castings are extensively utilized across industries, ranging from mining machinery to marine components. Key precautions for application are as follows:

• Anti-rust treatment is mandatory for service in humid environments.
• Low/medium carbon steel shall be prioritized for parts under impact loads.
• Thermal expansion coefficient must be taken into account for high-temperature working conditions.
• Casting shrinkage ratio shall be strictly controlled for precision components.