What are the effects of impure emulsion on cold-rolled coil production?
A: Hard impurities in the emulsion can cause pitting on the rolls; impurities remaining between the steel plates can also cause powdering defects in the cold-rolled coil after heating, affecting product quality.
How to solve the problem of uneven edges on cold-rolled coils?
A: This defect is mostly due to inadequate centering control of the feeding device. A high-precision positioning system can be used to ensure centering of the coil before rolling; regular equipment calibration can reduce mechanical errors, thereby ensuring straight edges.
What causes orange peel-like patterns on the surface of the rolls during cold-rolled coil production?
A: This is mostly due to roll slippage during rolling, abnormal friction between the strip and the rolls, or insufficient emulsion flow or sudden interruption of supply, leading to excessively high strip temperature, causing the oil film on the strip surface to rupture, resulting in an orange peel-like pattern on the roll surface.
How to avoid serrated edge defects during pickling of cold-rolled coils? A: Before pickling, perform mechanical descaling to ensure uniform breakage of the iron oxide scale; control the pickling process to avoid excessively high acid concentration or pickling speed; adjust the strip tension to prevent uneven stress on the edges during pickling, which could lead to excessive corrosion and thus avoid serrated edges.
What regular checks are required for long-term storage of cold-rolled coils?
A: Regularly check the integrity of the anti-rust oil film and replenish it if necessary; monitor for damage to the packaging film to prevent moisture intrusion; monitor the warehouse environment using temperature and humidity sensors and activate dehumidification equipment promptly if humidity exceeds the standard; inspect old coils to prevent hidden quality degradation caused by prolonged storage.