Stainless / Marine / Corrosion Selection
Printable shop wall chart: Stainless / Marine / Corrosion Selection. Free letter-size PDF to print and post at the counter; 25 x 36 inch poster version available.
| Material | Salt-water performance | Notes |
|---|---|---|
| Plain / zinc-plated steel | Poor | Rusts in weeks to months |
| Hot-dip galvanized steel | Fair | Years, depends on exposure |
| 304 stainless | Fair | Pits and tea-stains in chlorides |
| 316 stainless | Good | Standard marine choice |
| Nickel alloys (Monel) | Very good | Severe service |
Common classes (ISO 3506-1)
| Class | Group | Tensile Rm (min) | Yield Rp0.2 (min) |
|---|---|---|---|
| A2-50 / A4-50 | Annealed | 500 MPa | 210 MPa |
| A2-70 / A4-70 | Cold worked | 700 MPa | 450 MPa |
| A2-80 / A4-80 | Strain hardened | 800 MPa | 600 MPa |
316 is the usual marine choice. Watch for crevice corrosion and galvanic couples with carbon steel or aluminum.
These tables carry the same figures as the printed sheet below.
The printed sheet

25 x 36 inch poster version
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Text version of this sheet
18-8
316
A2-70
A4-70
18-8 / 304
316
A2-70
A4-70
Choosing fastener materials for wet, salt and chemical exposure
Material ranking for salt exposure
Material
Salt-water performance
Notes
Plain / zinc-plated steel
Poor
Rusts in weeks to months
Hot-dip galvanized steel
Fair
Years, depends on exposure
304 stainless
Fair
Pits and tea-stains in chlorides
316 stainless
Good
Standard marine choice
Nickel alloys (Monel)
Very good
Severe service
Common classes (ISO 3506-1)
Class
Group
Tensile Rm (min)
Yield Rp0.2 (min)
A2-50 / A4-50
Annealed
500 MPa
210 MPa
A2-70 / A4-70
Cold worked
700 MPa
450 MPa
A2-80 / A4-80
Strain hardened
800 MPa
600 MPa
316 is the usual marine choice. Watch for crevice corrosion and galvanic couples with carbon steel or aluminum.
The Fastener App | TheFastenerApp.com
Fastener Guide reference FG-AEDB18 · thefastenerapp.com/fastener-guide/wall-charts/stainless-marine-corrosion-selection · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.

























