Surface Roughness of Mirror Stainless Steel Plate (Data)

Although mirror stainless steel plate is called mirror surface, it also has grade differentiation.

This grade refers to the roughness of the stainless steel surface.

Different grades represent different surfaces. For example, 8k and 12k of mirror stainless steel represent different surface effects, but this differentiation is obviously not refined enough!

Because it is only a general concept to distinguish the surface effect of stainless steel surface by the K number, it is difficult to distinguish it without comparison!

We have compiled a list so that we can find traces of stainless steel grades!

Surface gradeSurface roughnessSurface effect
Stainless steel surface finish Grade 14Ra 0.012~0.03μm 14k mirror stainless steel with excellent surface effect (ultra-fine polished stainless steel)
Stainless steel surface finish Grade 13Ra 0.015~0.02μm12k mirror stainless steel with excellent surface effect (ultra-precision polished stainless steel)
Stainless steel surface finish Grade 12Ra 0.02~0.16μm10k mirror stainless steel with excellent surface effect (fine polished stainless steel)
Stainless steel surface finish Grade 11Ra 0.1 ~0.2μm8k mirror stainless steel with good surface effect (fine polished stainless steel)
Stainless steel surface finish Grade 10Ra 0.2 ~0.3μm6k mirror stainless steel, BA stainless steel, original state of steel factory shipment
Stainless steel surface finish Grade 9Ra 0.4 μmThere is almost no brightness at 4k, also known as no brightness at 2B (fog)
Stainless steel surface finish Grade 8Ra 0.8 μm No mirror effect, can slightly identify the processing trace, and the unpolished surface
Stainless steel surface finish Grade 7Ra 1.6 μmNo mirror effect, able to identify the direction of processing traces, unpolished surface
Stainless steel surface finish Grade 6Ra 3.2 μmNo mirror effect, no visible processing trace, unpolished surface
Stainless steel surface finish Grade 5Ra 6.3 μmNo mirror effect, slight machining trace, unpolished surface
Stainless steel surface finish Grade 4Ra 12.5 μmNo mirror effect, visible processing trace, unpolished surface
Stainless steel surface finish Grade 3Ra 25 μmThere is no mirror effect, the surface is very rough, there are very obvious machining marks, and the surface is unpolished

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