Stainless Steel Mill Finishes

The standard industry designations for stainless steel finishes are classified by mill form, as there are separate finishes (or conditions) for sheet, strip, plate, bar, rod, wire, and tubing. Table 2 classifies the various stainless steel product forms. More detailed information on stainless steel product forms can be found in Ref 3.

Table 2 Classification of stainless steel product forms

Item

Description

Thickness

Width

Diameter or size

mm

in.

mm

in.

mm

in.

Sheet

Coils and cut lengths:

Mill finishes No. 1, 2D, and 2B

<5

< — 16

S 610

S 24

Polished finishes No. 3, 4, 6, 7, and 8

<5

< — 16

All widths

Strip

Cold finished, coils, or cut lengths

<5

< — 16

<610

<24

Plate

Flat rolled or forged

S 5

S — 16

>25

>10

Bar

Hot-finished rounds, squares, octagons, and hexagons

4

Hot-finished flats

> 3

> -8

6-25

1-10 4

Cold-finished rounds, squares, octagons, and hexagons

>13

> — 2

Cold-finished flats

8

Wire

Cold finished only: round, square, octagon, hexagon, flat wire

< — 16

8

< 13

< — 2

Pipe and tubing

Several different classifications, with differing specifications, are available. For information on standard sizes, consult Committee of Stainless Steel Producers, AISI.

Extrusions

Not considered "standard" shapes, but of potentially wide interest. Currently limited in size to approximately 165 mm (6 2 in.) diam circle, or structurals to 125 mm (5 in.) diam.

Source: Ref 2

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