Q&A on Cold-Rolling Production Processes
Release Date:
2022-06-23
Author:
Hengyuan Industry and Trade
1. What are the requirements for the incoming cold-rolled sheet material in a rolling mill?
Answer: 1) The chemical composition of the steel shall comply with the provisions of the national standard.
2) The thickness and width of the incoming materials comply with the specified requirements.
3) The surface shall be free of iron oxide scale, and the edges shall be free of cracks, etc.
4) No defects such as linear scratches, imprints, dents, blisters, or delamination.
5) The steel strip exhibits no towering or loose winding.
2. What are the main flatness defects of cold-rolled strip steel?
Answer: “Sickle bend,” “wave form,” and “bowl‑shaped curvature.” Wave forms come in various types, such as single‑sided waves, double‑sided waves, central waves, lateral waves, periodic waves, and localized waves.
3. What impact do flatness defects have on the cold-rolling process?
A: Poor flatness significantly affects the cold‑rolling process, posing challenges to operational practice. Severe camber can lead to edge‑tracking and strip breakage, while waviness may cause roll‑slip and strip‑break incidents. Unsatisfactory flatness also constrains the achievable rolling speed, thereby limiting mill throughput. Moreover, poor flatness restricts the minimum thickness that the mill can produce.
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