Shipbuilding & Offshore

Seawater is the harshest natural electrolyte: roughly 19,000 ppm chloride, plus wet–dry cycling and crevices. The first criterion here is not strength — it is whether the material resists crevice corrosion.

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Typical Parts & Material Selection

Part	Grade	Surface / Form	Watch For
Deck Railings / Fittings	316L	Tube / Section, Polished	Salt spray, post-weld passivation
Seawater Piping	2205 / 6Mo	Seamless / Welded Tube	Pitting, flow erosion
LNG Tank Inner Lining	304L / 304	Plate 8–50 mm	Low-temperature embrittlement, class approval
Housing / Kitchen Equipment	304 / 316L	8–2 mm, 2B/HL	Cleanability, fingerprint resistance
Fasteners / Tie-downs	316 / 2205	Bar / Forging	Stress corrosion cracking

These are common configurations.Actual selection depends on medium, temperature and welding methodThe same part can move from 304 to 316L or 2205. Naming the grade is less useful than describing the service conditions.

Three Real Bottlenecks in This Industry

Crevice corrosion is the leading failure mode

Under gaskets and at bracket-to-hull contacts, 304 shows rust within months. Design out crevices (continuous welds, drain holes) and upgrade to 316L or 2205.

Confirm class approval early

DNV / ABS / LR / CCS each maintain their own approved material lists. A better grade that is not approved still fails inspection — check at the quotation stage.

Welding distortion accumulates at assembly

Thin fitting parts warp and the error stacks up in final assembly. Pre-fabricate in sections with anti-distortion jigs and leave trimming allowance.