Shipbuilding & Marine

Seawater is nature's toughest electrolyte: roughly 19,000 ppm chloride, plus wet-dry cycling and crevices. The first criterion here isn't strength — it's whether the material can withstand crevice corrosion.

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Common Parts & Material Selection

Part	Grade	Surface / Size	Watch Out For
Floor / Equipment Supports	316L	Tube / profile, polished	Salt spray mist, post-weld passivation
Seawater Pipes	2205 / 6Mo	Seamless / welded tube	Pitting, flow erosion
LNG Tank Inner Lining	304L / 304	Plate 8–50 mm	Low-temperature toughness, class approval
Galley / Accommodation Equipment	304 / 316L	8–2 mm, 2B/HL	Cleanability, fingerprint resistance
Fasteners / Fittings	316 / 2205	Bar / forging	Stress corrosion cracking

These are typical configurations.Actual selection depends on environment, temperature, and welding method— The same part can switch from 304 to 316L or 2205. Describing the service conditions is more useful than specifying the steel grade.

Three Practical Constraints in This Sector

Crevice corrosion is the dominant failure mode

Under gaskets and at fixture-to-hull contact points, 304 corrodes within months. Design out the crevices (continuous welds, drain holes) and move to 316L or 2205.

Get Class Society Approval Early

DNV / ABS / LR / CCS each maintain their own approved materials list. The best steel grades that aren't yet approved can't pass inspection — check this at the quotation stage.

Welding Distortion Accumulates During Assembly

Thin equipment parts distort and tolerances stack up during final assembly. Pre-fabricate parts with anti-distortion fixtures and allow margin for correction.