Stainless Steel
Types and Durability
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Description Stainless Steel (Framing Members) |
Expected Lifespan (Years ) |
Adjustment Factors
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General
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| Austenitic stainless steel to BS 1449: Part 2 or BS 970: Part 1, grade 316, or BS EN 10088-2, grade 1.4401. Terne coated to BS 6582. |
35+
|
1st stage adjustment factor:
In industrial areas (heavy polluted), (except 316 grade austenitic steel): -15% years In urban areas: -10% years In suburban areas: -0% years 2nd stage adjustment factor: Within 20m from express way: -20% years Within 20m from major arterial road: -10% years Within 20m from light traffic road: – 5% years Within 20m from sea water/ area prone to salt spray: -15% years Test certificate from approved local testing authority : +15% years |
| Austenitic stainless steel to BS 1449: Part 2 or BS 970: Part 1, grade 316, or BS EN 10088-2, grade 1.4401. |
35+
|
|
| Austenitic stainless steel to BS 1449: Part 2 or BS 970: Part 1, grade 304, or BS EN 10088-2, grade 1.4301. Terne coated to BS 6582. Not suitable for use in exposed marine or aggressive industrial atmospheres. |
30
|
|
| Austenitic stainless steel to BS 1449: Part 2 or BS 970: Part 1, grade 304, or BS EN 10088-2, grade 1.4301. Factory applied organic coating, 25-50 microns nominal thickness. Not suitable for use in exposed marine or aggressive industrial atmospheres. |
30
|
|
| Austenitic stainless steel to BS 1449: Part 2 or BS 970: Part 1, grade 304, or BS EN 10088-2, grade 1.4301. Not suitable for use in exposed marine or aggressive industrial atmospheres. |
25
|
|
| Ferritic stainless steel to BS 1449: Part 2 or BS 970: Part 1, grade 304, or BS EN 10088-2, grade 1.4000 or 1.4301. Factory applied organic coating, 25-50 microns nominal thickness. For use with manufacturer’s approval in mild atmospheres only. |
20
|
|
| Unclassified ie stainless steel not to BS 1449: Part 2, BS 970: Part 1 or BS EN 10088-2, or less than above specifications. |
< 20
|
None |
Combination of adjustment factors (1st stage and 2nd stage) should be added to obtain the durability values. Refer to durability calculator.
Notes:
Ferritic steels are low in cost and corrosion resistance, and if the appearance is important their use should be redistricts to mild, indoor situation. Used outdoor, the material may suffer from pitted corrosion. Those most resistant, and the only one with any use in the building industry is the 17% chromium.
The life of metal coatings is influenced by the colour of the coating, the orientation of the building, and by the environmental conditions. Detailed guidance on lives and on any guarantee or warranty schemes is available from manufacturers. Proprietary products are available for the re-coating of factory applied coatings.
Corrosion of unprotected cut edges is a common problem which can occur within a relatively short space of time. This process can be delayed by the application of additional edge protection at the time of installation (eg latex system or other products recommended by sheet supplier).
Terne coatings are applied for decorative purposes only.
Some fading and chalking of coatings may occur within the life quoted.