Stainless Steel Surface Finishes Guide: 2B, BA, No.4, HL, 8K for Importers

If you import stainless steel sheet or coil, the surface finish matters as much as the grade. Pick the wrong one and your fabricator will fight with it all the way through polishing. Pick the right one and you save days of finishing work per batch.

I've been helping buyers source stainless from Chinese mills for years. The single biggest mistake I see? Importers ordering No.1 finish for a job that needs 2B, or paying for 8K mirror when a good No.4 would do. The cost difference between finishes can run 15-40% on the same grade and thickness. So getting this right matters.

Here's what we'll cover: the five most common finishes you'll encounter as an importer — what they look like, what they cost, where they're used, and how to tell your supplier exactly what you need. We'll also touch on how laser cutting interacts with each finish, since that's our side of the business.

What Is a Stainless Steel Surface Finish?

A surface finish is a controlled texture applied to the stainless steel surface during or after rolling. It affects appearance, corrosion resistance, cleanability, and how well the material accepts further processing like welding or laser cutting.

Standard finishes are defined in ASTM A480/A480M and by mill-specific standards (GB/T 3280 in China, JIS G4305 in Japan, EN 10088-2 in Europe). When you order from a Chinese mill, the finish designation (2B, BA, No.4, HL, 8K) follows these international standards and means the same thing whether the coil comes from Shanghai or Stuttgart.

The roughness is measured in Ra (micrometers). Lower Ra = smoother surface. Here's a quick reference:

Finish	Name	Ra Range (µm)	Reflectivity	Relative Cost
No.1	Hot Rolled, Annealed & Pickled	3.2 – 6.3	Matte, non-reflective	Baseline (1.0×)
2D	Cold Rolled, Dull	0.4 – 1.2	Dull, uniform	1.05×
2B	Cold Rolled, Bright	0.1 – 0.5	Semi-reflective	1.1×
BA	Bright Annealed	0.05 – 0.2	Mirror-like (inert gas)	1.25×
No.4	Brushed (120-180 grit)	0.2 – 0.6	Satin, directional grain	1.3×
HL	Hairline	0.15 – 0.4	Fine directional lines	1.35×
SB	Satin Blast	0.2 – 0.8	Uniform matte	1.15×
8K	Mirror Polish	< 0.05	Full mirror	1.5× – 2.0×

Prices above are rough estimates based on 304 2B at $2,800–$3,200/ton FOB China. The premium changes with volume, grade, and thickness. 316L will carry a bigger absolute premium because the base material costs more.

The Five Finishes You Need to Know

1. 2B Finish — The Workhorse

2B is the default cold-rolled finish for general use. The mill rolls the coil cold, anneals it in a controlled atmosphere, then gives it a light temper pass through polished rolls. The result is a semi-bright, uniform surface that's flat and consistent.

Ra range: 0.1–0.5 µm. Good reflectivity but not mirror-like.

Where you see it: Restaurant counters, kitchen equipment, ventilation hoods, food processing machinery, chemical storage tanks, pharmaceutical equipment. If it's stainless and you can't see a brush grain, it's probably 2B.

Cost premium: About 10% over No.1 hot-rolled plate. Most mills carry 2B sheet (0.3–6.0 mm) in standard sizes — 1000×2000, 1219×2438 (4'×8'), 1220×2440, 1500×3000 mm.

Laser cutting note: 2B cuts cleanly on fiber lasers with nitrogen assist at 6–12 kW. No surface prep needed. The cut edge is slightly darker than the face, but that's normal for laser-cut 2B sheet.

For most importers buying 304 or 316L sheet for general fabrication, 2B is the right call. Don't over-spec unless you actually need the look of a brushed or mirror finish.

2. BA (Bright Annealed) — The Clean Room Standard

BA is cold-rolled then annealed in a pure hydrogen or hydrogen-nitrogen atmosphere. No pickling needed — the surface comes out of the furnace bright. The anneal happens under protective gas, so no oxide scale forms in the first place.

Ra range: 0.05–0.2 µm. Smoother than 2B, more reflective. Not quite mirror but close.

Where you see it: Dairy equipment, pharmaceutical vessels, food-grade piping, sanitary fittings, medical device enclosures, brewery tanks. Basically anywhere that needs to be cleaned frequently and inspected for residue.

Cost premium: About 25% over No.1. You're paying for the controlled atmosphere annealing line and the tighter surface quality control.

Laser cutting note: BA cuts well but the annealed surface is softer than 2B. Watch for minor burring on the bottom edge if your laser settings are too aggressive. Use nitrogen at moderate pressure (8–10 bar) and keep the feed rate within spec for the thickness.

I've seen buyers order BA for a warehouse shelving project because they assumed "brighter = better." It was a waste of money. 2B would have been fine and saved them ~15% on material cost alone.

3. No.4 Finish — The Brushed Look

No.4 is a mechanically abraded finish. The mill runs the sheet through a brushing line with 120–180 grit abrasive belts. The result is a uniform satin sheen with visible directional grain.

Ra range: 0.2–0.6 µm. The grain hides fingerprints and minor scratches better than 2B or BA.

Where you see it: Elevator interiors, escalator cladding, kitchen backsplashes, commercial refrigerator panels, restaurant pass-through windows, store fixtures. It's the finish you see in every commercial kitchen and hotel lobby across the world.

Cost premium: About 30% over No.1. The extra cost is the brushing pass plus the scrap from inconsistent grain.

Laser cutting note: The brushed grain can cause uneven beam reflection at the cut front if the surface is too rough. Stick to grits 150 and finer for lasered parts. For 180 grit and finer, I haven't seen any issues on our 6 kW fiber machines. Rough grains (120 grit or coarser) may leave a slightly wider kerf on thin sheet (under 2 mm).

4. HL (Hairline) — Long Continuous Grain

HL is similar to No.4 but with a finer, longer, more consistent grain. It's polished with abrasive belts that leave a continuous linear pattern along the length of the sheet.

Ra range: 0.15–0.4 µm. The grain is more visible than No.4 but in a controlled, uniform way.

Where you see it: Architectural panels, building cladding, handrails, elevator doors, decorative trim, appliance fascias. Architects prefer HL for visible exterior surfaces because the long grain creates a consistent look across large panels.

Cost premium: About 35% over No.1. The longer, more consistent grain requires slower belt speeds and more quality inspection passes.

Laser cutting note: Same as No.4 — stick to fine grits. Post-cut edge deburring is usually needed for visible parts.

5. 8K Mirror Finish — The Premium Choice

8K (also called mirror polish or No.8 finish, though different mills distinguish them differently) uses progressively finer abrasives — typically from 240 grit up to 600–800 grit or even diamond paste — to achieve a reflective, mirror-like surface.

Ra: under 0.05 µm. You can see your own reflection clearly. Honestly, I've used pieces to check my hair in a pinch. Not joking.

Where you see it: Luxury hotel lobbies, high-end retail displays, jewelry showcases, decorative columns in premium buildings, elevator cabs in five-star properties, art installations.

Cost premium: 50–100% over No.1. 8K is expensive because it's labor-intensive — multiple polishing passes, intermediate cleaning, and a high reject rate. A mirror finish shows every imperfection, so the mill has to be careful.

Laser cutting note: This one is trickier. The highly reflective surface can deflect the laser beam, potentially reducing cut efficiency on very thin material. For 1–3 mm 8K sheet, our recommendation is a slightly slower feed rate (10–15% reduction) and a check on the back-reflection sensor. We've found nitrogen at 10–12 bar gives the best edge on mirror-finish 304.

Finish Selection: A Simple 5-Step Framework

Here's what I tell buyers who call me unsure which finish to order:

1. Will the surface be visible in the final product?
   No → Go with 2B or No.1. Save the cost premium for something that matters.
   Yes → Move to step 2.
2. Does it need to be cleaned frequently?
   Yes (food, pharma, medical) → BA or 2B. Smooth surfaces clean easier.
   No → Move to step 3.
3. Is appearance a primary selling point?
   Yes → Move to step 4.
   No → 2B is fine. Don't overthink it.
4. Do you want a brushed grain or a reflective surface?
   Brushed → No.4 or HL (HL for large continuous panels, No.4 for smaller fabricated parts).
   Reflective → 8K mirror (indoor decorative) or BA (functional clean-room).
5. What is your budget per sheet?
   Under $120/sheet (4'×8' × 1.5mm 304) → 2B or No.4
   $120–$180 → BA or HL
   $180+ → 8K mirror

One more thing — I see a lot of importers order 8K and then laser-cut it into small parts where the mirror edge gets destroyed anyway. If the customer only sees a small finished area, 8K is a waste. Use 2B or BA for the body and only mirror-finish the visible face.

Surface Finish vs. Laser Cutting Quality

Here's a comparison table based on our in-house testing at FANY LASER's 6 kW fiber cutting machines:

Finish	Cut Quality (1-10)	Edge Dross Risk	Recommended Assist Gas	Speed vs 2B Baseline
No.1 (3 mm)	8	Low	O₂ or N₂	100%
2B (1.5 mm)	9	Very Low	N₂	100% (baseline)
BA (1.5 mm)	9	Low	N₂	100%
No.4 (1.5 mm)	8	Low–Moderate	N₂ (8-10 bar)	95%
HL (1.5 mm)	8	Low–Moderate	N₂ (8-10 bar)	95%
8K Mirror (1.5 mm)	7	Moderate	N₂ (10-12 bar)	85–90%

The takeaway: 2B and BA are the easiest to laser cut. No.4 and HL are close behind. 8K needs some tuning but works fine with the right settings. None of these finishes is a dealbreaker for laser cutting — it's more about knowing what to expect and adjusting your parameters.

Common Mistakes Importers Make

After working with hundreds of stainless steel buyers, here are the most frequent finish-related mistakes I run into:

1. Ordering BA for non-food applications.
If you're making decorative trim or architectural cladding, BA gives you a clean look but you're paying +25% for cleanliness you don't need. No.4 or 2B would work.

2. Specifying 8K for parts that get painted or coated.
I've seen this more than once. A customer pays for mirror finish, then powder-coats over it. The mirror prep is completely wasted.

3. Not specifying the finish at all.
Just ordering "304 stainless steel sheet" without a finish designation. The mill will ship whatever they have in stock. You might get 2B when you needed No.4, or No.1 when you needed 2B. Always include the finish in your PO.

4. Assuming all mills produce the same No.4.
The grain appearance varies between mills — different belt grits, belt speeds, and pressure settings produce visibly different results. Always request a sample (A4-sized or a small coupon) before committing to a production run. Mills are usually happy to provide one.

5. Overlooking protective film.
Polished finishes (No.4, HL, 8K) scratch easily during handling and transport. Make sure your supplier applies PE protective film and specify whether you need it on one side or both. Removing scratches from a No.4 sheet in the field is a headache.

Cost Comparison: Which Finish Makes Sense for Your Budget?

Here's a real cost estimate for a standard 4'×8' sheet of 304 stainless, 1.5 mm thick, FOB China (June 2026 pricing):

Finish	Est. Cost/Sheet (FOB)	Best For	Avg. Lead Time
No.1	$98–$112	Industrial plate, no surface concern	2–3 weeks
2B	$108–$123	General fabrication, food equipment	1–2 weeks
BA	$123–$140	Pharma, dairy, sanitary	2–3 weeks
No.4	$127–$146	Architecture, kitchens, fixtures	2–4 weeks
HL	$132–$151	Architectural panels, cladding	2–4 weeks
8K	$147–$224	Luxury, decorative, display	3–5 weeks

Pricing fluctuates with nickel and molybdenum costs. In 2026, nickel has been relatively stable around $17,000–$18,500/ton, so these estimates should hold within ±10% for the next few months. If nickel spikes above $20,000, all sheet prices move up across the board.

How to Specify Finishes in Your Purchase Order

Use this format when ordering from Chinese mills or trading companies:

If you're ordering from FANY LASER, just tell us the application and we can recommend the right finish. We source 304, 316L, 430, 201, and duplex grades with all standard finishes. Our contact page has the direct line to our export team.

FAQ: Stainless Steel Surface Finishes