Exporting Steel Hull Plates and Structural Sections to the US — US Shipyards

Steel hull plates and structural sections are the backbone of the US shipbuilding industry, used in the construction of naval vessels, commercial cargo ships, offshore platforms, and tugboats. For US shipyards, the ability to source high-strength, certified steel from international suppliers is critical to maintaining production schedules and controlling costs. Latin America, with its established steelmaking capacity and proximity to US Gulf and East Coast ports, offers a competitive supply source for these essential materials.

This page provides a comprehensive guide for suppliers in Latin America and Africa looking to export steel hull plates and structural sections to the United States, and for US shipyards seeking reliable procurement partners.

Product Specifications and Grades Relevant to US Buyers

Steel hull plates and structural sections must meet stringent US and international standards. The primary specifications for hull plates include ASTM A131, which covers structural steel for ships, and ABS (American Bureau of Shipping) rules for shipbuilding. Grades such as AH36, DH36, and EH36 are commonly used for hull structures due to their high yield strength and weldability. For structural sections like angles, channels, and beams, ASTM A992 or A572 Grade 50 are typical, often with supplementary ABS or Lloyd’s Register certification.

Thicknesses for hull plates range from 6 mm to 100 mm, depending on vessel type and location in the hull. Widths can exceed 3 meters, and lengths up to 18 meters. Tolerances are specified by ASTM A6/A6M. US shipyards also require mill test certificates (MTCs) that verify chemical composition and mechanical properties, as well as traceability to the heat number.

LATAM and Africa Supplier Landscape for Steel Hull Plates and Structural Sections

Latin America is a significant producer of shipbuilding-grade steel. Brazil is the largest regional supplier, with mills like Gerdau and Usiminas producing plates and sections that meet ABS and ASTM standards. Argentina’s Siderar and Mexico’s Ternium also supply structural shapes to the US market. In Africa, South Africa’s ArcelorMittal South Africa and Egypt’s Ezz Steel produce flat and long products, though their share of US shipbuilding imports remains smaller due to logistics costs.

Exporters in these regions benefit from existing trade agreements: Brazil and Argentina have bilateral steel agreements with the US that provide quota access under Section 232, while Mexico is exempt from Section 232 tariffs under USMCA. This tariff advantage makes LATAM suppliers particularly attractive for US shipyards seeking to minimize landed costs.

US Buyer Types — Who Buys This, How They Procure, What Specs Matter

US shipyards fall into two broad categories: military and commercial. Military shipyards, such as Huntington Ingalls Industries (Newport News, VA) and General Dynamics NASSCO (San Diego, CA), procure steel through long-term contracts with approved suppliers, often requiring MIL-S-16216K or NAVSEA standards. Commercial shipyards like Bollinger Shipyards (Lockport, LA) and Eastern Shipbuilding (Panama City, FL) buy for offshore support vessels, fishing boats, and barges, typically using ABS-grade steel.

Procurement is usually centralized through purchasing departments that issue RFQs with specific mill certifications, delivery schedules, and payment terms. Lead times for imported steel can range from 8 to 16 weeks. Shipyards also value just-in-time delivery to avoid inventory carrying costs, making reliable logistics a key differentiator.

Certifications and Import Requirements for Steel Hull Plates and Structural Sections

All steel imported into the US for shipbuilding must comply with the following:

• ASTM A131 / ABS Rules: For hull plates, the American Bureau of Shipping requires that steel be produced at mills approved by ABS or other IACS member classification societies. Mills must hold ABS Product Design Assessment (PDA) certification.
• Section 232 Tariffs: Steel imports are subject to 25% tariffs unless exempted under a quota agreement (e.g., Brazil, Argentina) or USMCA (Mexico). Suppliers must provide a mill certificate showing country of origin and steel type.
• US Coast Guard (USCG) Requirements: For vessels operating in US waters, steel must meet 46 CFR Part 54 or Part 56, which reference ASTM and ABS standards.
• NAVSEA Standards: For military contracts, steel must comply with NAVSEA Technical Publication T9074-AD-GIB-010/1688, covering welding and material traceability.

Importers must file entry documents with US Customs and Border Protection (CBP) including the commercial invoice, packing list, bill of lading, and the mill test certificate. For Section 232, a valid quota allocation number is required if the country of origin is subject to quotas.

Pricing and Lead Time Context

Pricing for steel hull plates and structural sections is driven by global scrap and iron ore prices, mill capacity, and freight rates. As of 2024, ASTM A131 Grade AH36 plate prices from LATAM mills typically range from $800 to $1,200 per metric ton FOB, while structural sections like A992 beams range from $700 to $1,000 per metric ton FOB. Freight from Brazil to US Gulf ports adds approximately $50–$100 per ton, with lead times of 6–10 weeks for production plus 2–4 weeks for ocean transit.

US domestic mill prices are often 10–20% higher, particularly for ABS-certified plates, making imports cost-competitive despite tariffs. Quota utilization for Brazil and Argentina has historically been high, so early booking of quota slots is recommended.

How Coppermont Connects Suppliers to Buyers

Coppermont specializes in connecting Latin American and African steel producers with US shipyards. We provide:

• Supplier Vetting: We verify mill certifications, ABS approvals, and prior export experience.
• Compliance Advisory: Our team ensures your steel meets ASTM, ABS, USCG, and NAVSEA requirements.
• Logistics Coordination: We arrange shipping from mill to US port, including inland transport to shipyard.
• Quota Management: For Section 232 quota countries, we help manage allocation to avoid tariff exposure.

Whether you are a supplier seeking US buyers or a shipyard diversifying your steel supply, Coppermont provides the market intelligence, compliance support, and trade networks to make the transaction seamless.

For Suppliers: Submit your mill capabilities and certifications to receive qualified buyer inquiries. For Buyers: Contact us to access vetted suppliers with competitive pricing and reliable delivery.

Contact Coppermont today to start your steel trade journey.