Flat grain
From：
Gaoming Foundation Date：12-22 3435 Belong to：Cold rolling knowledge
Defect Name: flat grain < br / > definition and appearance: < br / > the defect is in the shape of feather grain, which is a line mark during the leveling process, which can be distributed locally in the steel strip or throughout the whole bandwidth. 
& nbsp; Cause: < br / > caused by uneven extension of strip steel in roll gap< Br / > hazards: < br / > affect the appearance and use of the product< Br / > prevention and elimination methods: < br / > ● reasonably adjust the reduction, and timely adjust in case of single-sided wave< Br / > ● keep the tension stable after leveling< Br / > ● reasonably select roll crown and correctly use positive and negative bending rolls< Br / > inspection and judgment: < br / > ● visual inspection< Br / > ● slight flat lines are allowed in some parts, but the steel coil with hand feel or large flat lines must be degraded< br/>
& nbsp; Cause: < br / > caused by uneven extension of strip steel in roll gap< Br / > hazards: < br / > affect the appearance and use of the product< Br / > prevention and elimination methods: < br / > ● reasonably adjust the reduction, and timely adjust in case of single-sided wave< Br / > ● keep the tension stable after leveling< Br / > ● reasonably select roll crown and correctly use positive and negative bending rolls< Br / > inspection and judgment: < br / > ● visual inspection< Br / > ● slight flat lines are allowed in some parts, but the steel coil with hand feel or large flat lines must be degraded< br/>
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