When talking about home gates, stair railings or metal structures, you will always hear the term "Grade 304 stainless steel". But what exactly is it, and why do professionals recommend it? This article gives clear answers.
What is Grade 304 (SUS 304) stainless steel?
Grade 304 belongs to the austenitic family. Its main ingredients are ~18% chromium and ~8% nickel, known as "18/8 stainless".
The chromium reacts with oxygen in the air to form a thin "passive film" over the surface. When scratched, this film self-heals automatically, providing permanent protection against rust and corrosion.
Comparing 3 popular grades: 201 vs 304 vs 316
| Property | Grade 201 | Grade 304 (recommended) | Grade 316 |
|---|---|---|---|
| Nickel content | Low (1–4%) | Standard (8–10%) | High (10–14% + molybdenum) |
| Rust resistance | Moderate (may rust outdoors) | Excellent (rust-free) | Highest (salt & chemical resistant) |
| Best use | Indoor furniture | Outdoor gates, railings, roofing | Seaside, chemical plants, pools |
| Price | Cheapest | Best value | Very expensive |
Why Grade 304 is the best answer for home gates
- Withstands Bangkok weather: strong sun, heavy rain and urban pollution with ease.
- Lasting beauty: keeps its shine, easy to clean with plain water or dish soap.
- Great investment: pay once, use 20+ years — no yearly repainting.
Consult Khun Anan directly — free on-site quote!
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