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409/409l cold rolled stainless steel begins to crystallize after pouring, the supercooling degree of the liquid phase is largely due to direct contact with the surface of the crystallizer, and at the same time, the surface of the crystallizer promotes non-spontaneous nucleation. Therefore, the nucleation rate of the liquid phase is high and the formation rate is high. Fine equiaxed crystals on the surface. The formation of fine equiaxed grains on the surface is rapid, and the carbides of titanium are too short to precipitate.
(1) The solid and liquid two-phase region of 409L stainless steel is very small, less than 30°C
(2) There is almost no γ phase at high temperatures. Therefore, when the 409L steel begins to crystallize after pouring, the supercooling degree of the liquid phase is largely due to direct contact with the surface of the crystallizer, and at the same time, the surface of the crystallizer promotes non-spontaneous nucleation. Therefore, the nucleation rate of the liquid phase is high and the formation rate is high. Fine equiaxed crystals on the surface.
| Grade | C | Si | Mn | S | P | Cr | Ni | Ti |
|---|---|---|---|---|---|---|---|---|
| ss 409 | ≤0.08 | ≤1.0 | ≤1.0 | ≤0.03 | ≤0.045 | 10.5～11.7 | 0.5 Max | 6xC – 0.75 |
| ss 409l | ≤0.03 | ≤1.0 | ≤1.0 | ≤0.03 | ≤0.045 | 10.5～11.7 | 0.5 Max | 6xC – 0.75 |
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