Galvanized-steel jacketing

budget metal jacket; zinc weathers from shiny (e~0.23) to dull grey (e~0.28+).

Assessment

For: cheap, robust indoors.

Against: white rust outdoors; zinc fumes if welded nearby; banned over austenitic stainless in some specs (molten-zinc embrittlement in fire).

Best for: indoor mechanical protection on a budget.

Surface emissivity (typical)

ε ≈ 0.28

Low ε: less radiation loss, HOTTER surface at the same duty — check personnel-protection clearances.

FAQ

What is the emissivity of galvanized-steel jacketing?

≈0.28 for typical surfaces (bright/new metal — ages upward as oxide forms).

When is galvanized-steel jacketing the right choice?

indoor mechanical protection on a budget.

What are the limits of galvanized-steel jacketing?

white rust outdoors; zinc fumes if welded nearby; banned over austenitic stainless in some specs (molten-zinc embrittlement in fire).