2B vs BA Stainless Steel
2B is a moderately reflective cold-rolled annealed and pickled finish. Bright annealed (BA) is a smooth, bright, reflective finish produced by annealing in a protective atmosphere and is not pickled in acid.
Scope of this comparison
Cold rolled stainless steel flat products. BS EN 10088-2 and ASTM A480 designations are shown separately and are not equivalent; Ra values are typical references, not standard acceptance limits.
0.1–0.5 µm
2B typical Ra, BSSA reference
0.05–0.1 µm
2R (BA) typical Ra, BSSA reference
Representative view: a 2B sheet and a BA sheet edge to edge, the matte grey face against the mirror-bright one.
The Short Answer
The choice between 2B and BA is conditional, not a ranking. Under ASTM A480 definitions, 2B is a moderately reflective cold-rolled annealed and pickled finish, while BA is a smooth, bright, reflective finish produced by annealing in a protective atmosphere. The process difference is that 2B is pickled, whereas BA is not pickled in acid, because a thin oxide film is formed during annealing. Appearance and downstream work determine which surface is more suitable; acceptance requirements should be checked against the specified finish definition.
What Is Being Compared
When comparing 2B and BA, first fix the specification system. In BS EN 10088-2:2024, for cold rolled flat products, the cold rolled, heat treated, pickled, skin passed finish is designated 2B; the BSSA finish comparison cross-references this to ASTM A480 designation 2B. In the same comparison, BS EN 10088-2 finish 2R (cold rolled, bright annealed) is cross-referenced to ASTM A480 designation BA. The bright annealed finish appears as 2R in the EN system and BA in the ASTM system, so a 2B order is not the same boundary as a BA order.
Side by Side
| Attribute | 2B | BA | Basis |
|---|---|---|---|
| BS EN 10088-2 finish designation | 2B | 2R | BS EN 10088-2:2024 Table 6, cold rolled flat products |
| ASTM A480 finish description | No. 2B: smooth, moderately reflective cold-rolled annealed and pickled or descaled finish | Bright Annealed (BA): smooth, bright, reflective finish | ASTM A480, cold rolled flat products |
| Process condition | Cold rolled, heat treated, pickled, skin passed | Cold rolled, then annealed in a controlled protective atmosphere; not pickled because a thin oxide film forms during annealing | BS EN 10088-2:2024 for 2B; product form cold rolled flat products for BA |
| Appearance | Smooth, non-reflective, good flatness control | Highly reflective mirror finish, very smooth | BS EN 10088-2:2024, cold rolled flat products |
| Typical Ra reference | 0.1-0.5 micrometres | 0.05-0.1 micrometres | BSSA typical values based on manufacturers'/finishing contractors' data; BS EN 10088-2 does not express Ra except 1K and 2K special finishes |
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Appearance After Fabrication
Both finishes are produced in the mill, so surface damage after fabrication cannot simply be polished back to the original finish. The table compares how far each finish can be restored on flat products.
| Attribute | 2B | BA |
|---|---|---|
| Where the finish is produced | In the mill | In the mill |
| Can it be matched after fabrication? | No | Not exactly; a mechanical mirror polish can be close |
Of the 2B, 2D and BA cold rolled finishes, BA is the one most nearly able to be matched by a mirror polish.
Specification Checklist for 2B and BA
Settle these points before accepting a 2B or BA order: the designation, the appearance reference and whether BA is available for the grade and thickness.
- Record the designationNot all suppliers use the same terminology to refer to the same finish, so record the standard and the exact designation on the order.
- Agree a reference sampleAgree a reference sample for appearance acceptance before the order is confirmed, so the finish is judged against a physical piece rather than a name.
- Check BA availabilityBA is common in some grades and thicknesses, but not all; confirm it for the specified grade and thickness before the order is confirmed.
Finish Pages
Use the dedicated finish pages for detail that this comparison does not repeat.
- Finish
2B Stainless Steel Finish
How 2B is defined, produced and specified.
- Finish
BA Stainless Steel Finish
How BA is defined, produced and specified.
2B and BA Coil From ZIVO
ZIVO STEEL supplies cold rolled stainless steel coil in 2B and BA in the grades and sizes below. For appearance, downstream work and acceptance, use the finish pages above.
| Product page | Grade | Finish | Thickness | Width |
|---|---|---|---|---|
| 304 Stainless Steel Coil | 304 | 2B | 0.3–3.0 mm | 1219 / 1500 mm |
| 304 Stainless Steel Coil | 304 | BA | 0.3–2.0 mm | 1219 mm |
| 316L Stainless Steel Coil | 316L | 2B | 0.3–3.0 mm | 1219 mm |
| 430 Stainless Steel Coil | 430 | 2B | 0.26–3.0 mm | 1219 / 1250 mm |
| 430 Stainless Steel Coil | 430 | BA | 0.3–1.2 mm | 1219 mm |
| 201 Stainless Steel Coil | 201 (low-nickel J series) | 2B | 0.3–2.0 mm | 1219 mm |
| 201 Stainless Steel Coil | 201 | 2B | — | — |
| 304L Coil | 304L | 2B | 0.3–3.0 mm | 1219 / 1500 mm |
| 201 Stainless Steel Coil | 201 (low-nickel J series) | BA | 0.25–1.0 mm | 1219 mm |
| 316L Stainless Steel Coil | 316L | BA | — | — |
| 304 DDQ Stainless Steel Coil | 304 DDQ | 2B | 0.3–3.0 mm | 1000 / 1219 mm |
Frequently Asked Questions
The 2B finish is cold rolled, heat treated, pickled and skin passed. The bright annealed finish is cold rolled, then annealed in a controlled protective atmosphere and is not pickled in acid because a thin oxide film forms during annealing, eliminating the need for pickling.
Under ASTM A480 definitions, 2B is a smooth, moderately reflective cold-rolled annealed and pickled finish, while BA is a smooth, bright, reflective finish produced by annealing in a protective atmosphere. BSSA gives typical Ra reference figures of 0.1-0.5 micrometres for 2B and 0.05-0.1 micrometres for 2R (bright annealed); these are typical values, not BS EN 10088-2 requirements.
BS EN 10088-2:2024 finish 2R (cold rolled, bright annealed) is cross-referenced to the ASTM A480 designation BA, and BS EN 10088-2:2024 finish 2B is cross-referenced to the ASTM A480 designation 2B. These are cross-references between designation systems, not equivalences, so the standard and product form should be stated on the order.
No. The 2B finish is produced in the mill and cannot be matched after fabrication, and the BA finish is produced in the mill and cannot be exactly matched after fabrication, although a mechanical mirror polish can be close.
State the standard and the designation on the order, because not all suppliers use the same terminology to refer to the same finish. BS EN 10088-2 surface finish definitions do not express finish in terms of Ra values, apart from the 1K and 2K special finishes, so appearance acceptance for 2B or BA is best agreed against a reference sample.
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