I remember the term "surface finish code" from my professional activities.

Common Surface Finishes for Flat Products from EN 10088-2 (for full list see Specifying finishes for stainless steel flat products (sheet and plate)

Surface Finish Code

Description

Mill finishes

1D
Hot rolled, heat treated, pickled. The most common hot rolled finish. A non reflective, rough surface. Not normally used for decorative applications
:
1J or 2J
Brushed or dull polished. Smoother than 1G/2G. Grade of polishing grit or surface roughness can be specified
:
2L

Coloured by chemical process to thicken the passive layer and produce interference colours. A wide range of colours is possible.
:
https://www.linkedin.com/pulse/what-surface-finishes-availab...

Similar to "material code / Materialschlüssel", other terms I am familiar with.

Materialschlüssel / material code
(Ernst, Dictionary of Engineering and Technology)

Anmerkung: Bei "Oberflächenschlüssel" geht es um die ursprüngliche oder durch Bearbeitung erzeugte Oberflächenbeschaffenheit. Genau genommen müsste es "Oberflächenbeschaffenheitsschlüssel" heißen, aber das war deutschen Technikern wohl doch zu lsng.


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Note added at 21 Stunden (2018-05-30 11:08:19 GMT)
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Der in den Kopfleisten der jeweiligen Preiskatalogseiten zu
findende Oberflächenschlüssel zeigt, in welchen Materialien,
Oberflächenausführungen und Farben die genannten Artikel lieferbar
sind.
:
The surface finish code found in the header of each price list
page shows the materials, surface finishes and colours in which
the product indicated can be supplied.
https://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd...

Mechanically Polished ID and OD
Inside Diameter (ID) Outside Diameter (OD) Surface Finish Code
Ra (Max) Surface Treatment Ra (Max) Surface Treatment ASME BPE Alfa-Laval Dixon S&O TopLine VNE SPX
https://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd...
(Followed by different codes from different issuers)

True Y, All Ends Tri-Clamp®, PL Finish - Bio-Pharm Fittings
Surface Finish Code: PL
https://www.gvc.net/p/767/true-y-pl-finish

Surface finish
Available connections
Available housings
1 Standard surface finish All All ★
2(3) Hand polished (Ra < 0.4 μm) Tri Clamp only All ★
3(4) Ra < 0.76 μm, hygienically approved Tri Clamp only A, X ★
4(4) Electro-polished to  0.76 μm, hygienically approved Tri Clamp only A, X ★
7(4) Mechanically-polished to Ra < 0.1 μm, hygienically approved Tri Clamp only A, X ★
8(4) Electro-polished to Ra < 0.38 μm, hygienically approved Tri Clamp only A, X ★
:
14. Available only for a Rosemount 2120 with a Tri Clamp fitting, Product Certification code NA, G*, or I*, and Surface Finish code 3, 4, 7, or 8.
https://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd...
(Codes specified by the manufacturer)

See also https://books.google.de/books?id=L6EiAgAAQBAJ&pg=RA1-PA408&l... (cannot be copied)

Surface Finish Code ID / OD Finish (Maximum Ra Allowed) BPE Designation
PX Unpolished / Unpolished SF0
PZ Unpolished / 32 Ra SF0
PC 20 Ra Mechanical / Unpolished SF1
PF 25 Ra Mechanical / Unpolished SF2
PB 30 Ra Mechanical / Unpolished SF3
PL 20 Ra Mechanical / 32 Ra SF1
:
http://andronstainless.com/custom-products/mechanical-polish...