Sometimes graphite cold rolled steel coil wrinkle is black, sometimes white, strip or wavy, and sometimes blocky. Some touch it by hand and there will be powder on the hand.
Traces produced by the contact of the graphite roll of the heat treatment furnace with the steel strip.
leaving a full width line mark on the surface of the graphite cold rolled steel coil wrinkle due to the vibration of the work rolls of the rolling mill or the leveling machine;
The shock marks that have been generated when the work rolls are ground, are transferred to the surface of the steel strip, generally at an angle to the rolling direction.
Trace of the steel strip folded.
The surface of the graphite cold rolled steel coil wrinkle has a crease perpendicular to the rolling direction in the width direction.
linear stripes reflected on the surface of the graphite cold rolled steel coil wrinkle due to wrinkles of the liner;
The wrinkles of the liner paper are printed on the surface of the steel strip and are not washed away by alkali washing.
STEEL GRADE | Tensile Strength | Yield Strength max | Elongation min. | r | n | |||
<0.70 | 0.70-<1.0 | 1.0-<1.6 | >=1.6 | min | min | |||
SC2 | 270-330 | 180 | 38 | 39 | 40 | 41 | 1.9 | 0.20 |
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