Inspection of forgings before heat treatment is a preliminary inspection process for the finished products specified in the forging drawings and process cards after the forging process is completed, including its surface quality, appearance dimensions, technical conditions, etc. The following aspects should be paid attention to in bainite inspection:

1. The appearance of the forging should be free of cracks, rust, scale, abrasions and other defects that affect the quality of heat treatment.

2. The forging drawing should indicate the main dimensions, special shape parts, different cross-section parts, and the shape and position of holes.

3. The size and accuracy of the processed parts should indicate the machining allowance, surface roughness, dimensional accuracy, position accuracy, shape accuracy, etc.

4. The inspector can spot check the underpressure according to 10%-20% of the batch of forging heat treatment. Only when the batch forging meets the drawing can it enter the inspection process. Forgings that have been inspected before quenching should be stored separately.

5. Before quenching, check the finished product rack. 1-2 forgings (folded and cracked scraps cannot be used for sampling) should be placed in the sampling rack, and the word "sampling" should be marked on the sampling rack to distinguish them.

6. After inspection, the number of finished products, the number of repairable scraps, the number of final scraps and the defect code should be accurately filled in the accompanying card and signed by the inspector.