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Surface finish designations of stainless steel

thyssenkrupp Materials (UK) supply stainless steel in many different finishes. A complete list of industry standard surface finishes can be found below:

You can also find information on different polished finishes by visiting our polished stainless steel page.

All data is to EN110088-2

Hot Rolled

Symbola Type of process route Surface finish Notes
1U Hot rolled, not heat treated, not descaled Covered with rolling scale Suitable for products which are to be further worked e.g strip for rerolling.
1C Hot rolled, heat treated, not descaled Covered with rolling scale Suitable for parts which will be descaled or machined in subsequent
production or for certain heat-resisting applications.
1E Hot rolled, heat treated,
mechanically descaled
Free of scale The type of mechanical descaling, e.g coarse grinding or shot blasting,
depends on the steel grade and the product, and is left to the
manufacturer’s discretion, unless otherwise agreed.
1D Hot rolled, heat treated,
pickled
Free of scale Usually standard for most steel types to ensure good corrosion resistance; also common finish for further processing. It is permissible for grinding marks to be present. Not as smooth as 2D or 2B.

Cold Rolled

Symbola
Type of process route Surface finish Notes
2H Work hardened
Bright Cold worked to obtain higher strength level.
2C Cold rolled, heat
treated, not descaled
Smooth with
scale from heat
treatment
Suitable for parts which will be descaled or machined in subsequent production or for certain heat-resisting applications.
2E Cold rolled, heat treated, mechanically descaled Free of scale
Usually applied to steels with a scale which is very resistant to pickling
solutions. May be followed by pickling.
Surface roughness is depending on the mechanical descaling method
and may differ if the surface is e.g. shot blasted or brushed.
2D Cold rolled, heat
treated, pickled
Smooth Finish for good ductility, but not as smooth as 2B or 2R.
2B Cold rolled, heat
treated, pickled, skin
passed
Smoother than
2D
Most common finish for most steel types to ensure good corrosion
resistance, smoothness and flatness. Also common finish for further
processing. Skin passing may be by tension levelling.
2A Cold rolled, heat treated, bright-pickled, skin passed Smoother and
more reflective
than 2D
Typical finish for ferritic grades when high reflectivity is desired.
2R Cold rolled, bright
annealedb
Smooth, bright, reflective Smoother and brighter than 2B. Also common finish for further processing.
2Q Cold rolled, hardened
and tempered, scale
free
Free of scale Either hardened and tempered in a protective atmosphere or descaled
after heat treatment.

Martensitic Grades

Symbola Type of process route Surface finish Notes
1G & 2G Groundc See Footnoted
Grade of grit or surface roughness can be specified. Unidirectional
texture, not very reflective.
1J & 2J Brushedc or dull
polishedc
Smoother than
ground.
See Footnoted
Grade of brush or polishing belt or surface roughness can be specified.
Unidirectional texture, not very reflective.
1K & 2K Satin polishc
See Footnoted Additional specific requirements to a “J” type finish, in order to achieve adequate corrosion resistance for marine and external architectural applications. Transverse Ra < 0.5um with clean cut surface finish.
1P & 2P Bright polishedc
See Footnoted Mechanical polishing. Process or surface roughness can be specified. Non-directional finish, reflective with high degree of image clarity.
2F Cold rolled, heat
treated, skin passed on
roughened rolls
Uniform nonreflective matt surface. Heat treatment by bright annealing or by annealing and pickling.
1M Patterned Design to be
agreed; 2nd
surface flat
Chequer plates used for floors.
2M Patterned Design to be
agreed; 2nd
surface flat
A fine texture finish mainly used for architectural applications.
2W Corrugated
Design to be
agreed
Used to increase strength and/or for cosmetic effect.
2L Colouredc Colour to be agreed
1S & 2S Surface coatedc
Coated with another metal e.g. copper.

Footnotes

a - First digit: 1 = hot rolled, 2 = cold rolled.

b - May be skin passed.

c - One surface only, unless specifically agreed at the time of enquiry and order.

d - Within each finish description the surface characteristics can vary, and more specific requirements may need to be agreed between manufacturer and purchaser (e.g. grade of grit or surface roughness).

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