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Finishes For Stainless Steel: Astm A480 ASTM A480 Description Roughness Ra (In) Roughness Ra (M) Bs en 10088-2 ISO 1302

This document discusses finishes for stainless steel and their specifications. It outlines 8 different finishes from No. 1 to No. 8 based on the ASTM A480 standard. The finishes range from rough mill finishes to highly polished special finishes and are designated by surface roughness and corresponding standards like BS EN 10088-2 and ISO 1302.

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630 views1 page

Finishes For Stainless Steel: Astm A480 ASTM A480 Description Roughness Ra (In) Roughness Ra (M) Bs en 10088-2 ISO 1302

This document discusses finishes for stainless steel and their specifications. It outlines 8 different finishes from No. 1 to No. 8 based on the ASTM A480 standard. The finishes range from rough mill finishes to highly polished special finishes and are designated by surface roughness and corresponding standards like BS EN 10088-2 and ISO 1302.

Uploaded by

Anonymous oTrMza
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Stainless Steel Enclosures and Industrial Applications

Finishes for Stainless Steel


Metals are finished not only for aesthetic purposes, but also to improve their corrosion resistant
properties. The ASTM A480 standard provides a framework for different metal finishes based on
certain criteria. Sheet steel finishes are designated by a system of numbers ranging from a No.
1 finish to a No. 8 finish. Additional global standards that apply to metal finishes include BS EN
10088-2 and ISO 1302.

Surface Finish Specifications

ASTM Roughness Roughness BS EN


A480 ASTM A480 Description Ra (in) Ra (m) 10088-2 ISO 1302
- - - - 1U -
- - - - 1C -
No. 1 Hot-rolled, annealed, and de-scaled. 157 to 276 4.0 to 7.0 1E, 1D N8, N9
- - - - 2H -
Mill Finish

- - - - 2C -
- - 16 to 39 0.4 to 1.0 2E N5, N6
No. 2D Cold-rolled, dull finish. 16 to 39 0.4 to 1.0 2D N5, N6
No. 2B Cold-rolled, bright finish. 3.9 to 20 0.1 to 0.5 2B N3 to N5
A bright cold-rolled finish retained by
final annealing in a controlled
No. BA atmosphere furnace. 2.0 to 3.9 0.05 to 0.1 2R N2, N3
- - - - 2Q -
- - 79 to 98 2.0 to 2.5 1G, 2G N7
Intermediate polished finish, one or
No. 3 both sides. 28 to 47 0.7 to 1.2 1J, 2J N6, N7
General purpose polished finish, one
No. 4 or both sides. 12 to 25 0.3 to 0.6 1J, 2J N4, N5
Special Finish

Dull satin finish, Tampico brushed,


No. 6 one or both sides. 10 to 20 0.25 to 0.50 1K, 2K N5
No. 7 Light luster finish. 2.4 to 7.9 0.06 to 0.20 - N3, N4
No. 8 Mirror finish. 0.8 to 3.9 0.02 to 0.10 1P, 2P N1 to N3
- - - - 2F -
- - - - 1M, 2M -
- - - - 2W -
- - - - 2L -
- - - - 1S, 2S -

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