What precautions should be taken when storing SPCC coils?
A: Store in a dry, well-ventilated environment to prevent rusting caused by moisture. Protect the coils by applying oil or a protective film, and avoid contact with sharp objects to prevent surface scratches.
What special requirements must SPCC coils meet when used in automotive parts?
A: They must possess good plasticity and stamping resistance. For some critical parts, the inclusion content must be controlled to ensure dimensional accuracy and a defect-free surface, preventing any impact on assembly and operational safety.
What are the differences between SPCC coils and SPCD/SPCE coils?
A: All three are Japanese cold-rolled carbon steel grades. SPCC is the general grade, suitable for general applications; SPCD is the stamping grade, suitable for stamping processes; SPCE is the deep-drawing grade, suitable for deep-drawn parts with complex shapes, with forming performance increasing in that order.
What are the common reasons for SPCC coil certification failures?
A: 1. Excessive chemical composition, indicating substandard raw material quality; 2. Surface defects such as scratches or black spots; 3. Hardness, dimensional, and other indicators not meeting certification standards.
What is the difference between rolled SPCC coils and hard SPCC coils that have undergone low-temperature annealing?
Answer: Rolled SPCC coils typically do not undergo full annealing, resulting in extremely high hardness and very poor machinability. Hard SPCC coils, indicated by the suffix "1," require low-temperature annealing. While they have higher hardness, their machinability is superior to rolled SPCC coils, and they are not entirely unsuitable for forming.