Product Name

Ship Flat Steel (Marine Flat Bar / Shipbuilding Flat Strip & Plate Strip)

Introduction

Ship Flat Steel are heavy-duty flat bars, strips or cut-to-width plate blanks manufactured for shipbuilding, offshore and marine applications. Specified for high strength, good weldability, precise flatness and long-term corrosion protection, these flats are used as bearing plates, stiffeners, splice/cover plates, deck strips, gusset flats and mounting plates where reliable contact surfaces, weldability and class-compliant material grades are required.

Typical Specifications

Forms: hot-rolled flat bar, cut-to-width plate strips, planed/ground flats, and precision-ground bearing flats.

Common materials / grades: AH36 / DH36 / EH36 (shipbuilding grades), A131, S355 / Q345, A709 or equivalent; stainless (304/316) and duplex steels for special applications.

Width (W): 20 mm – 1,200 mm (custom widths available).

Thickness (T): 4 mm – 150 mm (from thin tie strips to heavy cover plates).

Lengths: standard 3 m, 6 m, 12 m; single-piece to yard/transport limits or cut-to-length.

Tolerance & flatness: tighter flatness and thickness tolerances available (planed or ground) for bearing and grout contact faces.

Mass formula: mass (kg/m) = Width(mm) × Thickness(mm) × 0.00785.

Key Features & Advantages

Marine-grade metallurgy: selected steel grades with adequate toughness, weldability and fatigue performance for shipboard service.

Bearing-ready surfaces: planed/ground options ensure full-face contact for bearings, grout pads and deck supports.

Fatigue & weld detailing: edges and preparation can be supplied to minimize stress concentrations under cyclic loads.

Wide supply forms: from simple hot-rolled flats to precision-ground and machined plates ready for assembly.

Coating compatibility: suitable for shop-applied marine primer/epoxy systems, thermal zinc spray, or delivery for yard paint application.

Classification support: MTCs and material traceability to support ABS, DNV, Lloyd's or other class requirements.

Typical Shipboard Applications

Bearing and grout plates for deck supports and pedestals.

Splice / cover plates for plate girders and stringers.

Deck tie strips, weld-on stiffener strips and edge protection.

Mounting/base plates for machinery, winches and foundations.

Doublers and reinforcement strips around cutouts, hatches and openings.

Repair flats for onsite patching and retrofit work.

Fabrication & Value-Added Services

Cut-to-size & CNC profiling: accurate length cutting, CNC contouring and notch/cutout production.

Precision planing & grinding: flatness and thickness control for bearing faces and sealing surfaces.

CNC drilling & countersinking: bolt-hole patterns, slotting and countersinks to drawing.

Weld preparations: beveling, chamfering and tack-assembly for reduced yard welding time.

Heat treatment: stress-relief or specified heat-treatment cycles where required.

Surface preparation & coating: shot-blast to Sa2.5, primer/epoxy application, thermal zinc spray or delivery uncoated per yard schedule.

Kitting & pre-assembly: numbered packs and matched splice plates for rapid fit-up.

Quality Assurance & Testing

Material certificates: full Mill Test Certificates (MTC) and batch traceability to support class and owner requirements.

Mechanical & impact testing: tensile, yield and Charpy impact testing per class or project specification.

NDT: PT/MT/UT/RT available for critical assemblies or as required by classification.

Dimensional & flatness checks: gauge reports for width, thickness and face flatness for bearing plates.

Coating inspection: blast profile, coating thickness and adhesion testing for shop-applied marine systems.

Packaging, Transport & On-Site Support

Packaging: flat-stacked on timber skids with polymer spacers, strapped and protected from seawater/condensation.

Protection: VCI/oil for storage, crating for precision-ground plates, temporary corrosion inhibitors for export.

Marking: part ID, heat number, orientation and splice references clearly labeled.

Transport: planning for heavy/oversize loads and yard lifting limits; spliced deliveries with match-drilled splice kits where needed.

Site assistance: provision of erection drawings, bolt kits and optional on-site fit-up supervision.

Ordering Information - What We Need

Please provide:

Width × thickness × length (or drawing) and quantity.

Required material grade and any classification society references.

Supply condition (as-rolled / planed / ground / machined) and flatness/tolerance class.

Value-added requests: holes, countersinks, bevels, cutouts, heat treatment, coating.

Testing / inspection requirements (MTC, tensile, Charpy, NDT) and witness needs.

Delivery constraints (single-piece transport/crane limits) and desired lead time.

Why Choose Our Ship Flat Steel?

We provide shipbuilding-grade flat steel with marine-suitable metallurgy, tight dimensional control and shop-ready machining and coating services-reducing yard welding, improving fit-up and supporting classification requirements. Send your flat/plate list or drawings and we'll return a size-to-weight table, flatness specification options and a tailored quotation with lead time.

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