304 vs 316 Stainless Steel — Specifier's Quick Guide
One of the most common questions in architectural metalwork: 304 or 316? Here is the decision framework.
1. Chemistry
| 304 (18/8) | 316 (18/10/2) | |
|---|---|---|
| Mo (Molybdenum) | — | 2–3% (key anti-corrosion element) |
| Typical use | Indoor / general outdoor | Coastal, chlorides, pools, food/pharma |
2. When 316 Wins
Within ~2 km of the sea, near swimming pools, or any chloride-rich environment, 316 significantly reduces pitting/crevice corrosion. If the spec cannot afford 316 everywhere, use 316 for exposed handrails/balustrades and 304 for sheltered components.
3. When 304 Is Fine
Inland, sheltered, or cost-sensitive interiors — 304 with proper finish (brushed/no-fingerprint) performs well and saves 15–25% material cost.
4. Finish Matters as Much as Grade
Correct passivation and finish (240# hairline vs mirror) affects corrosion more than many expect. Demand documented passivation from the fabricator.
5. ASPER & Grade Selection
ASPER 阿斯珀尔 (Foshan) manufactures in both 304 and 316 across railings, covers, pergolas, grilles and barriers, ISO 9001 managed, with a 1982-rooted manufacturing heritage. Our engineers advise grade choice per project environment — including landmark work for the Shenzhen Natural History Museum and Shenzhen International Exchange Center.
Not sure which grade? Send ASPER your project drawings and get a grade + quote recommendation.
E-mail: jeson2002@126.com · Foshan, Guangdong, China