Short answer: Architectural stainless steel splits by visibility and environment: indoor balustrades and handrails use 304 brushed or polished; outdoor and coastal applications upgrade to 316; roofing and cladding panels choose gauge and finish based on deflection limit, cleaning access and salt/acid exposure. Purchasers should pair grade, finish, protective film and maintenance instructions, and never rely on grade alone for visible facades.
This guide is written for stainless steel buyers, sourcing teams, engineers and product manufacturers. The purpose is not to declare one universal winner, but to turn a broad material question into a specification that a mill or service center can quote, process and inspect consistently.
Quick Comparison
| Option | Key point | Typical use or decision |
|---|---|---|
| 304 / 304L No.4 or HL | Standard indoor / light outdoor | Handrails, trim, elevator cabs, internal cladding |
| 316 / 316L No.4 or HL | Coastal / industrial outdoor | Balustrades, public facades, roofing near sea |
| 304 / 316 BA or mirror | Premium appearance, high maintenance | Luxury interiors, columns, feature walls |
| Patterned / embossed 304/316 | Anti-slip or decorative | Floor plates, wall panels, ceiling features |
The table is a starting point. Actual performance depends on the governing standard, delivered condition, dimensions, surface finish, fabrication route and service environment. Commercial names should never replace a complete purchase specification.
What Buyers Should Evaluate
- Write a written maintenance plan for visible installations; otherwise, the “guarantee” against tea staining is meaningless.
- Match fasteners, anchors and adhesives to the panel alloy to avoid galvanic streaks down the facade.
- Require approved samples for grain direction, film peel protection and any visible welds.
Because grade and finish work together in visible facades, our guide to stainless steel surface finishes and the differences between coil, sheet, plate and strip will help you lock the right surface and product form before ordering.
For production orders, share the end use rather than requesting a grade or finish in isolation. A supplier can then review corrosion exposure, forming severity, welding, visual requirements and packing before material is cut. This early review is usually less expensive than correcting a rejected shipment or unstable production trial.
Common Purchasing Mistakes
- Selecting finish from one supplier’s sample without comparing under actual building lighting
- Installing 304 handrails on a coast and being surprised by tea staining within one season
- Skipping a protective film or leaving it in place for months after installation, causing adhesive residue
These mistakes are avoidable when drawings, approved samples, inspection methods and certificate requirements are agreed before production. For visual products, retain a signed master sample. For functional dimensions, define where and how measurements will be taken.
Recommended RFQ Wording
State alloy, thickness/width, finish code and roughness value if applicable, grain direction, protective-film details (long-term UV stable if exposed), inspection class, and whether the material is pre-cut to panel size or coil for roll-forming. Mention expected environment (coastal, industrial, indoor) when possible.
Also include order quantity, acceptable quantity variation, destination, required delivery date and whether partial shipments are allowed. If a requirement is critical, make it measurable and place it on the purchase order rather than only in an email conversation.
How Still Steel Supports the Project
Still Steel supplies stainless steel coil, strip and sheet and provides slitting, cut-to-length, brushing, polishing and protective-film services. We can compare available mill material with your drawing, prepare trial quantities and preserve heat-number traceability through service-center processing.
Send the grade, dimensions, annual volume and application to vip@still-steel.com, or discuss the requirement on WhatsApp.
Frequently Asked Questions
Is 304 enough for coastal balustrades?
In mild coastal areas with regular cleaning, 304 with a smooth brushed or polished surface and a passive finish may be acceptable. Severe coastal or de-icing-salt exposure normally requires 316.
Does mirror cladding show every flaw?
Yes. Mirror and BA cladding magnify every dent, dust streak and installation mark. For most public facades, a controlled No.4 or HL (hairline) finish is more forgiving and easier to maintain.
What gauge should I use for roofing or wall cladding?
Typical gauges run 0.4–1.2 mm depending on panel span, wind load and fastener spacing. Define a live load, deflection limit and substrate in the structural design brief.
Technical References
Reference documents support general selection and fabrication principles. The final material decision must follow the applicable contract, standard, regulation and engineering review for the specific product.