The quality requirements for the cast steel parts of construction machinery involve multiple aspects to ensure that the cast steel components meet the usage demands and safety standards of construction machinery. The following is a detailed summary of the quality requirements for the cast steel parts of construction machinery:

### 1. Appearance Quality Requirements

1. **Surface Smoothness**: The surface of the cast steel parts should be cleaned thoroughly, with flash, burrs, sand inclusions, and oxide scale removed to ensure a smooth surface.

2. **Defect Control**: No obvious cracks, sand holes, pores, shrinkage cavities, shrinkage porosity, sand inclusions, or noticeable pits are allowed. These defects can severely affect the strength and performance of the cast steel parts.

### 2. Dimensional and Shape Requirements

1. **Dimensional Accuracy**: The actual dimensions of the cast steel parts must be strictly controlled within the tolerance ranges specified in the design drawings. Any dimensions exceeding the tolerance range should be deemed non-compliant.

2. **Shape Deviation**: The shape of the cast steel parts should closely match the design model, avoiding abrupt shape changes and using smooth surface transitions. For cast steel parts with specific contour requirements, shape inspection should be conducted using professional measuring tools.

### 3. Material Composition and Mechanical Performance Requirements

1. **Chemical Composition**: The material composition of the cast steel parts must meet design requirements, including the content of elements such as carbon, silicon, manganese, and control of carbon equivalent.

2. **Mechanical Properties**: The cast steel parts should possess sufficient mechanical properties, such as tensile strength, yield strength, and impact toughness. These properties need to be tested through tensile tests, impact tests, etc., to ensure compliance with relevant standards.

### 4. Internal Quality Requirements

1. **Non-destructive Testing**: Non-destructive testing methods such as ultrasonic flaw detection and magnetic particle inspection should be used to detect internal defects like cracks and slag inclusions in the cast steel parts.

2. **Density and Uniformity**: Qualified cast steel parts should have uniform density consistent with material characteristics.

### 5. Heat Treatment and Surface Treatment Requirements

1. **Heat Treatment**: Cast steel parts must undergo appropriate heat treatment to improve their mechanical properties and corrosion resistance. The heat treatment process should strictly control parameters such as heating temperature, holding time, and cooling rate.

2. **Surface Treatment**: The surface of cast steel parts should be shot-peened or treated with other suitable surface treatments to improve surface roughness and coating adhesion. Rust removal should be performed before painting to ensure coating quality.

### 6. Other Requirements

1. **Drawings and Process Requirements**: Before production, casting processing drawings should be prepared in conjunction with the production process, and the client should confirm the dimensions, weight, and quality grades of various areas on the drawings.

2. **Welding Repair Requirements**: For cast steel parts with defects, welding repairs should be carried out according to the size and nature of the defects. The welding repair process should strictly control welding parameters and repair quality to ensure that the repaired areas do not affect the overall performance of the cast steel parts.

3. **Document Management Requirements**: Each cast steel part should be assigned a unique number, and quality records should be kept for no less than the product's lifecycle. Factory documentation should include material reports, heat treatment curves, inspection records, and other files.

In summary, the quality requirements for the cast steel parts of construction machinery cover appearance quality, dimensions and shape, material composition and mechanical properties, internal quality, heat treatment and surface treatment, as well as other aspects. These requirements aim to ensure that the cast steel parts meet the usage demands and safety standards of construction machinery, enhancing product reliability and durability.

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