Cast Steel Barge Corner Plate | ASTM A27 Grade 70-36 Marine Hull Corner Fitting

Cast Steel Barge Corner Plate | ASTM A27 Grade 70-36 Marine Hull Corner Fitting

Product Overview

The cast steel barge corner plate is a weld-on marine outfitting fitting used at exposed barge corner areas. It provides a shaped steel transition between adjoining hull or deck-edge plates and is supplied in 6 in and 12 in nominal sizes. The available model references are 486-6 and 487-12, matching common North American barge-corner dimensions.

The supplied product requirement specifies ASTM A27/A27M Grade 70-36 cast carbon steel with heat treatment, mechanical testing, and sandblasted surface preparation. A formed mild-steel version may also be discussed, but cast steel and formed mild steel are different construction routes and should be confirmed separately before quotation, drawing approval, and production. No load rating is provided; this corner plate should not be described or used as a lifting point, mooring fitting, or towing attachment unless separately engineered and approved for that duty.

Quick Specifications

• Product type: Weld-on barge corner plate → shaped marine outfitting fitting for newbuilding, repair, or replacement at barge corner locations.
• Model references: 486-6 and 487-12 → common 6 in and 12 in corner-plate configurations; public US catalogues often use the DF-486-6 and DF-487-12 prefixes.
• Cast material: ASTM A27/A27M Grade 70-36 [485-250] → defined carbon-steel casting grade with minimum tensile and yield requirements.
• Alternative construction: Formed mild steel, to be confirmed → tooling or forming mould controls the corner profile, but material, plate thickness, weld seams, and dimensions require separate approval.
• Approximate weight: 54 lb for 6 in and 167 lb for 12 in → important for handling, packing, installation planning, and freight calculation.
• Quality control: Heat-treatment records, mechanical test results, dimensional inspection, and visual surface inspection → scope to follow the purchase specification and certificate requirement.
• Surface preparation: Sandblasting → final blast grade, weld-zone coating exclusion, primer, and vessel coating system should be stated in the order.
• Certificate scope: Material certificate, maker certificate, and ABS-related inspection or approval can be arranged only when specified and subject to project and class requirements.

Main Technical Parameters

Selection & Inquiry Guide

Step 1: Confirm the required construction route: ASTM A27 Grade 70-36 cast steel or formed mild steel. Do not treat the two versions as automatically interchangeable.

Step 2: Select model 486-6 / 6 in or 487-12 / 12 in according to the vessel drawing, existing corner geometry, adjoining plate arrangement, and replacement measurements.

Step 3: Provide the barge type, installation position, newbuilding or repair status, adjoining hull/deck plate details, fit-up drawing, and any required weld preparation.

Step 4: Confirm surface treatment, including sandblast grade, whether weld edges must remain unprimed, shop-primer requirement, and the final vessel coating system.

Step 5: Confirm inspection and documentation scope before quotation: MTR, heat-treatment record, dimensional report, visual inspection, optional NDT, ABS or other class involvement, and witness points.

Step 6: Provide quantity, delivery destination, required delivery time, packing requirement, and photos or sketches of the existing corner when the product is for replacement.

Structure

Shaped cast or formed steel corner body | A / B / C / D / E dimensional profile | External corner transition surface | Weld preparation edges | Sandblasted or specified coating surface

Casting, Welding & Quality Advantages

• ASTM A27 Grade 70-36 provides a defined carbon-steel casting basis for general applications, including specified tensile properties, heat treatment, and mechanical testing.
• For the cast-steel version, a one-piece casting can form the corner transition without relying on multiple small formed segments; the final casting profile must follow the approved drawing.
• For the mild-steel version, forming tooling and fabrication jigs can support repeatable geometry, but plate grade, thickness, seam layout, and welding procedure must be confirmed separately.
• Fit-up surfaces and weld-adjacent areas should be clean, dimensionally controlled, and free from coating that would interfere with shipyard welding.
• Casting surfaces can be dressed and sandblasted to remove loose scale and prepare the fitting for inspection and the specified coating system; acceptance criteria should follow the purchase specification.
• Dimensional checks of A, B, C, D, and E help the yard verify corner fit before welding, reducing rework during newbuilding or replacement.
• Optional visual, magnetic-particle, or other NDT can be arranged according to project requirements; NDT method, acceptance criteria, and witness scope are not assumed by default.

Custom Attributes

• Product Category: Barge corner plate → marine hull and deck-edge outfitting fitting for barge corner locations.
• Model: 486-6 / 487-12 → 6 in and 12 in nominal-size references from the supplied parameter table.
• Cast Material: ASTM A27/A27M Grade 70-36 → project purchase edition, heat treatment, and MTR scope to be confirmed.
• Alternative Material Route: Formed mild steel → separate drawing, material grade, plate thickness, and fabrication details required.
• Installation: Weld-on → fit-up, adjoining structure, weld preparation, WPS, and local reinforcement are shipyard or design-office responsibilities unless included in the supply scope.
• Surface Treatment: Sandblasting → blast grade, primer, weld-zone masking, and final paint system to be confirmed.
• Inspection: Mechanical test and heat-treatment control → additional NDT or third-party witness available according to order scope.
• Certificate Requirement: Material certificate / maker certificate / class-related documentation → available upon request and subject to approval procedure.

How It Works

Barge corner geometry is checked → Corner plate is fitted to adjoining hull or deck-edge plates → Approved weld preparation and welding secure the fitting → The shaped steel body forms the external corner transition → Dimensions, welds, surface condition, and coating are inspected

Applications

Inland barges | Deck barges | Work barges | Marine construction barges | Newbuilding corner outfitting | Repair and replacement of damaged barge corner fittings | Shipyard and barge-fabrication projects

Certifications & Advantages

Certificates and inspection can be arranged according to project requirement, material traceability, purchase specification, and classification-society approval procedure. ABS approval is not stated as a default supply condition and should be confirmed before order.

Certification: CCS, NK, BV, ABS, DNV, LR, KR, IRS, RS, RINA, CRS, Makers Test Certificate.

Drawing & Photos

FAQ

Q1: What is the difference between the cast-steel and formed mild-steel versions?

A1: The cast version uses ASTM A27 Grade 70-36 carbon steel and requires casting, heat treatment, and mechanical-property control. The formed mild-steel version is produced from plate using forming tooling and fabrication processes. Material grade, wall or plate thickness, weld seams, weight, and inspection scope may differ, so the two routes must be quoted and approved separately.

Q2: How should the 6 in and 12 in models be selected?

A2: Select model 486-6 or 487-12 from the vessel drawing or verified replacement measurements. Confirm dimensions A through E, adjoining plate geometry, installation clearance, weld preparation, and whether the published model reference includes the DF prefix.

Q3: Is the barge corner plate load-rated or supplied with ABS approval by default?

A3: No load rating is included in the supplied data, so it must not be represented as a lifting, mooring, or towing fitting. Material certificates, ABS-related inspection, or class documentation can be arranged only when specified, accepted by the relevant parties, and included in the order scope.