Manufacturing method of steel
A manufacturing method and steel technology, which is applied in the field of steel manufacturing, can solve problems such as small cracks, and achieve the effect of improving quality, improving quality, and improving surface quality
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Embodiment 1
[0118] The inventors of the present invention trimmed a stainless steel slab before rolling using the surface reducing device 1 described above.
[0119] Hereinafter, it demonstrates in more detail using an Example.
[0120] A test sample having a thickness of 50 mm and a square of 500 mm was extracted from a SUS304 slab manufactured by known continuous casting. The test surface is a single side of 500mm square, and the surface is covered by black oxide scale formed when molten steel solidifies. The height of the unevenness of the vibration ripples existing on the surface is about 0.1 mm to 0.2 mm.
[0121] use Figure 1 ~ Figure 3 The surface reduction grinding head of the disclosed shape was subjected to electrolytic abrasive surface reduction treatment on the test surface of the sample. The conditions of this surface reducing grinder are as follows.
[0122] Main items of surface reduction grinding head
[0123] ·Surface reducing grinding head diameter 250mm, electro...
Embodiment 1a
[0137] In Example 1a, the average removal amount of the black leather surface caused by electrolytic abrasive surface reduction treatment was 90 μm.
[0138] In addition, in Example 1a, the Ra (center line average roughness) of the slab surface after the treatment was 0.21 μm.
[0139] In Example 1a, there are depressions and indentations caused by casting in the processed slab, but the oxide scale at the bottom of these defects is removed by the high-current pulse electrolysis unique to this technology, and it has a metallic luster. In addition, the bottoms of pit-like defects that inevitably exist on the surface of the slab are also descaled.
[0140] After performing hot rolling using the slab thus processed, a stainless steel final product (steel material) can be produced by a known method.
Embodiment 1b
[0142] In Example 1b, the average removal amount of the black leather surface caused by electrolytic abrasive surface reduction treatment was 330 μm.
[0143] In addition, in Example 1b, the Ra (center line average roughness) of the surface of the slab after the treatment was 0.20 μm.
[0144] In Example 1b, substantially no surface defects observed on the surface of the slab of Example 1a were found on the surface of the slab after the treatment.
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Abstract
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