🏗️ Steel & Metals Freight
Flatbed coil securement, OCTG transport, and the Monterrey steel corridor — the highest-volume flatbed lane in North America. What freight brokers need to know to win steel and metals accounts.
Why Steel & Metals Freight Is Different
Steel freight is flatbed freight — and flatbed is a specialist's game. The load securement requirements, equipment types, weight management, and cargo expertise required are significantly higher than dry van. Shippers who find a reliable flatbed steel broker pay for consistency, not the cheapest rate.
Steel coils are the most common steel flatbed load and one of the most technically demanding. FMCSA requires coil cradles or v-boards, minimum 4 chain tie-downs, and working load limits that match the coil weight. Improperly secured coils can shift or roll, causing catastrophic accidents. Carriers who regularly haul coils invest in proper coil equipment (coil racks, chains rated 5/16" or larger, rubber dunnage mats). Verify equipment before tendering — not every flatbed carrier is coil-ready.
Steel is dense — a standard flatbed (48') maxes out at 48,000 lbs of steel before hitting the 80,000 lb gross vehicle weight limit. Heavy coils or structural steel often require strategic load placement to comply with per-axle weight limits (12,000 lb steer, 34,000 lb tandem drive, 34,000 lb tandem trailer under federal bridge law). Overweight loads require state permits, which add cost and time. Experienced steel brokers know how to work with carriers on load plans to avoid permit requirements when possible.
Steel imports are subject to Section 232 tariffs (25% on most steel products) in addition to standard HTS duties. The Mexico-US steel corridor is a critical exception: USMCA-qualifying steel from Mexico is exempt from Section 232 tariffs if it meets rules of origin. However, steel that is "melted and poured" in third countries (notably China) and processed in Mexico does NOT qualify for USMCA exemption. CBP closely scrutinizes Mexico-origin steel certificates of origin. This tariff landscape directly affects shipper decisions on which plants to source from — which affects freight lanes.
Steel moves in two primary patterns: mill direct (from the steel plant to the end user) and service center (mill → steel service center → end user). Mill direct moves are large, consistent, and high-volume — ideal for dedicated carrier programs. Service center moves are smaller, just-in-time, and more varied — broker-friendly. Most steel freight brokers build their books at service centers before working their way into mill direct accounts. In Mexico, Ternium and DEACERO are mill-direct shippers; their service center networks create service center freight throughout the US.
Steel Product Types & Equipment Guide
Different steel products require different equipment and securement methods. Knowing which equipment matches which product is a core competency for steel freight brokers.
Flat steel wound into cylinders. 3,000–60,000+ lbs. Requires flatbed with coil racks or depressed-center flatbed. Chain tie-downs required. Hot-rolled coils are the workhouse of automotive steel supply chains — every car body starts as coil steel. Primary Mexico source: Ternium Monterrey.
I-beams, H-piles, angles, channels for construction and infrastructure. Up to 60 feet long. Requires extended flatbed, step deck, or RGN (Removable Gooseneck) for oversized. Bundles must be chain-secured. Common bridge formula violations — need permit for long/heavy loads.
Oil country tubular goods — 30–45 ft steel pipe for oil wells. Requires pipe racks (v-bunks) on flatbed. Bundles secured with chains. Common from Monterrey/Saltillo Mexico to Permian Basin Texas and Eagle Ford Shale. Very sensitive to oil price — freight volumes correlate with rig count.
Flat steel plate for fabrication, shipbuilding, and energy applications. Up to 8 feet wide, often overwidth. May require overdimensional permit. Stacked with dunnage between layers to prevent shifting. Can move dry van when cut to size, but large plates require flatbed. Rubber or wood dunnage prevents surface damage.
The Monterrey Steel Corridor
Monterrey, Mexico is the steel capital of North America — home to Ternium (the largest steelmaker in Latin America), DEACERO, and dozens of steel service centers and fabricators. The Monterrey → Laredo → US flatbed lane is one of the highest-volume and most consistent freight corridors on the continent.
ArcelorMittal's Ternium operates integrated steel plants in Monterrey producing hot-rolled coil, cold-rolled, galvanized, and tinplate. Primary customers are Mexico's automotive OEMs (GM, Ford, Stellantis, BMW) and US automotive stamping plants. A large share of Mexico-built vehicle steel starts at Ternium. Mill-direct loads from Ternium move by dedicated contract carriers, but overflow and service center redistribution creates broker opportunities.
Mexico's largest independent steelmaker specializing in long products: rebar, wire rod, structural sections, and steel mesh. Primary inputs come from US scrap steel imports via Laredo. Outputs are primarily construction materials for Mexico's infrastructure boom and US export. DEACERO's service center network across Mexico creates high-frequency, LTL-range flatbed moves from their distribution depots.
Tenaris TAMSA (Tubos de Acero de Mexico) in Veracruz/Saltillo is a major global OCTG producer supplying Permian Basin, Eagle Ford, and Bakken drillers. TAMSA pipe moves northbound via Laredo to US oil patch destinations. Highly cyclical — volumes correlate directly with US rig count (Baker Hughes data). When oil is above $70/bbl and rig counts climb, this corridor surges. OCTG is specialty flatbed freight with limited carrier pools.
Mexico Cross-Border Steel Compliance
Steel imports from Mexico face additional regulatory scrutiny due to Section 232 tariffs and CBP enforcement on country of origin. Understanding the compliance landscape helps brokers add value and avoid delays.
To qualify for USMCA steel tariff exemption (Section 232 free), the steel must be "melted and poured" in Mexico, Canada, or the US. Imported Chinese steel billet processed in Mexico does NOT qualify. CBP issues Country of Origin audits specifically for steel — the burden of proof is on the importer. Mill test certificates (MTCs) must document the melt origin. This creates a significant compliance task for importers and, indirectly, documentation requirements for brokers.
Heavy steel loads often exceed 80,000 lbs GVW, requiring state-issued overweight permits. For Mexico-to-US moves, the permit is required on the US side only (Mexico handles its own roads separately). Texas over-weight permits are required for most Laredo-crossing steel loads. Bridge permits (for heavy-axle loads) require route surveys. Permit lead times can be 1–5 business days — plan ahead. Multiple-state moves require permits in each state.
Many steel product categories from Mexico carry anti-dumping (AD) and countervailing duty (CVD) orders — these are separate from Section 232. AD/CVD orders are company-specific and product-specific. For example, certain hot-rolled steel flat products from Mexico may have AD margins while others don't. Brokers don't manage customs duties, but understanding that AD/CVD can affect import flow decisions (and thus lane consistency) helps in conversations with steel shippers about their sourcing.
Winning Steel Shipper Accounts
Steel service centers (Metals USA, Olympic Steel, Ryerson) are more accessible than mill accounts. They move varied product types (cut-to-length, slit coil, plate, bar) and frequently use the spot market. Build your carrier network and coil expertise at service centers before pursuing mill-direct accounts like Ternium or Nucor.
OCTG freight moves with oil prices. Check Baker Hughes rig count weekly — when US rig count is rising, OCTG freight from Mexico to Texas/Oklahoma/North Dakota is surging and rates are climbing. Position yourself as an OCTG specialist when rig counts are rising and steel shippers scramble for flatbed capacity to the oil patch.
Heavy steel brokers who can turn around overweight permits quickly (same-day for Texas, next-day for multi-state) are highly valued. Build relationships with permit expediting services for Texas, Indiana, Ohio, and Michigan — the primary destinations for Monterrey-origin steel. The ability to solve permit logistics separates specialist brokers from generalists.
Automotive stamping plants (Martinrea, Magna Stamping, Shiloh) receive coil steel from Mexico-based mills continuously. They're near automotive assembly plants in Michigan, Kentucky, Tennessee, and Texas. GetFreight.ai tracks the full supply chain: Ternium Monterrey → automotive stamping → OEM assembly. Map the chain and approach stamping plants directly about their inbound steel program.
Steel Freight FAQ
What is the difference between a standard flatbed and a coil trailer?
A standard flatbed is a flat, open platform trailer typically 48 feet long and 8'6" wide. A coil trailer is specifically designed to haul steel coils — it has a depressed center section (creating a cradle or "well") that allows coils to ride lower, improving stability, and it typically has coil racks or coil saddles permanently installed. Some coil trailers have a removable center well that converts between coil and flat configurations. Not all flatbed carriers have coil-equipped trailers, and not all flatbed drivers are trained for coil securement — always verify both before tendering a coil load.
How do Mexican steel tariffs affect freight lane consistency?
When tariff rates shift, steel sourcing decisions change — which directly affects freight lanes. For example, when Section 232 tariffs were initially imposed in 2018, many US manufacturers briefly shifted away from Mexican sources. When USMCA negotiations clarified the Mexico exemption, cross-border volumes recovered. The 2025 tariff environment has created shipper uncertainty — some are pre-buying inventory (creating surge freight), others are evaluating domestic sourcing (potentially reducing Mexico lanes). Brokers who understand tariff impact on sourcing decisions can anticipate lane changes before they happen.
What is a mill test certificate (MTC) and why do brokers need to know about it?
A mill test certificate (MTC) — also called a certified material test report (CMTR) — is a quality document from the steel mill certifying the chemical composition and mechanical properties of the steel. For USMCA country-of-origin compliance, the MTC documents where the steel was melted and poured. Brokers don't process MTCs, but steel shippers sometimes need help ensuring the MTC travels with the load (not in a separate document package). Missing MTCs at the border can cause customs holds. Understanding what an MTC is makes you a more credible conversation partner with steel shippers.
What happens if a coil breaks free during transit?
A coil shifting or coming free in transit is a cargo catastrophe — coils weigh thousands of pounds and can roll through the trailer wall, fall off the trailer, or cause the vehicle to overturn. Liability falls on the carrier (improper securement) and potentially the broker (negligent carrier selection) if a carrier qualification issue is found. Insurance claims for coil incidents are large. This is why documentation of carrier coil equipment and securement practices is critical before the first coil load. Confirm: coil rack installed, chains rated appropriately, driver trained in coil securement, and pre-trip coil check performed.