The heat treatment furnace temperature is too high or the annealing cooling rate is too fast; the steel coil is collided and injured before loading the furnace.
The surface 45T2 cold rolled coil is oxidized and its color gradually transitions from dark blue in the sides to light blue, brown, and pale yellow, collectively referred to as oxidized color.
Cold Rolled Steel Grades & Properties
| Structural Grades | C | Mn | P | S | Al | Cu | Ni | Cr | Mo | V | Cb | Ti | N |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 45T2 | .02- 0.08 | .30- 1.0 | .03- .07 | 0.025 | .02- .08 | 0.2 | 0.2 | 0.15 | 0.06 | 0.008 | 0.008 | 0.025 | .01- .03 |
1 When the annealing cover is not tightly sealed or leaks, the steel coil is oxidized;
2 cover furnace annealing process, high temperature furnace (roller temperature is greater than 110 ° C), resulting in steel coil oxidation;
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