High-Purity Iron Plant Targets US Rare Earth Magnet Supply Gap

Hertha Metals

High-purity iron is emerging as a hidden bottleneck in the US rare earth magnet supply chain as new defense sourcing rules approach. Houston-based Hertha Metals plans to build a 10,000 t/yr plant in Texas to produce high-purity iron used in neodymium-iron-boron permanent magnets.

The project targets a less visible vulnerability in magnet manufacturing. US policy has focused heavily on rare earth elements such as neodymium and praseodymium, but NdFeB magnets also require high-purity iron. Hertha Metals says about 90% of this material is currently produced in China.

The timing is strategically important. Updated Defense Federal Acquisition Regulations are set to take effect on 1 January 2027, restricting Chinese-origin rare earth magnets and constituent materials in covered US defense systems. That rule could force defense contractors, magnet makers and upstream material suppliers to rebuild supply chains around non-China sources.

Hertha Metals plans to break ground later this summer. The company says its Texas plant will become the first domestic producer of high-purity iron for this application, positioning the project at the intersection of magnet security, steelmaking technology and US industrial policy.

DFARS Rules Put Magnet Inputs Under Supply Chain Pressure

The 2027 DFARS deadline changes the strategic value of upstream magnet materials. Compliance will not depend only on where final magnets are assembled. It will also depend on the origin of constituent materials used in defense-related systems.

This creates a direct opportunity for domestic high-purity iron. NdFeB magnets require neodymium, praseodymium and often dysprosium or terbium for performance, but iron remains the major base component. If high-purity iron remains China-dependent, US magnet supply chains could still face compliance risk even if rare earth oxides or metals are sourced elsewhere.

Hertha Metals is trying to address that gap with its FLEXHERS process, short for flexible fuel hydrogen electric reduction smelting. The process combines electric arc furnace technology with natural gas or hydrogen to produce iron and steel.

The company says the technology can use lower-grade ores and iron ore fines that are difficult to process economically through conventional blast furnace routes. This could widen the domestic feedstock base and reduce dependence on imported high-purity iron.

Hertha currently operates a one-tonne-per-day demonstration plant in Conroe, Texas. It describes the site as the largest demonstration-scale single-step steelmaking facility in the US. Ore is sourced domestically from Minnesota, and the pilot facility is already producing material that meets customer specifications.

The planned high-purity iron facility will also produce trial steel products. Hertha sees the project as a stepping stone toward broader iron and steelmaking capacity, with a target of reaching roughly 500,000 t/yr of production within four to five years.

Cost competitiveness will be critical. Hertha says it does not plan to rely on a domestic supply premium. Instead, it aims to compete economically by replacing metallurgical coal with natural gas and electricity while using lower-cost ore feedstocks.

This claim matters because strategic materials projects often struggle when policy support is stronger than market economics. If Hertha can produce competitively without relying on premium pricing, the company could build a more durable position in both defense and commercial supply chains.

Hertha Metals CEO Laureen Meroueh

Domestic Iron Production Links Magnets, Electrical Steel and Clean Manufacturing

High-purity iron has strategic importance beyond NdFeB magnets. The material can also support electrical steel used in transformers, electric vehicle motors and other electromagnetic applications. These sectors are becoming more important as grid investment, electrification and domestic manufacturing policy expand.

The project also fits a wider shift in iron and steel markets. Traditional blast furnace production depends heavily on metallurgical coal and higher-emission processing routes. Meanwhile, demand for higher-grade iron inputs suitable for lower-carbon steelmaking is expected to rise as producers shift toward cleaner technologies.

Hertha’s process aims to sit inside that transition. By using electricity, natural gas or hydrogen, the company is positioning FLEXHERS as a lower-carbon alternative to legacy ironmaking. The ability to process lower-grade ore and fines could also help revive domestic iron production without requiring only premium feedstocks.

The US steel industry has increasingly focused on scrap-fed electric arc furnaces. That model supports recycling and lower emissions, but it does not fully solve domestic iron supply for high-purity applications. Magnets, electrical steel and advanced components often need controlled chemistry that scrap alone cannot easily provide.

This is where Hertha’s strategy becomes industrially relevant. The company is not only proposing another steel plant. It is targeting a specific materials gap between critical minerals policy, rare earth magnet manufacturing and advanced steelmaking.

Competition from subsidized overseas producers remains a risk. Hertha says it can compete on cost, but Chinese industrial support and below-cost exports could still challenge domestic producers. This is why policy, procurement rules and long-term customer commitments may become important even if the production technology works.

The company has not disclosed financing details, future fundraising plans or offtake agreements. That leaves open questions about capital structure, customer readiness and the pace of commercial scale-up. However, the 2027 DFARS deadline gives the project a clear market catalyst.

The broader implication is that rare earth magnet supply security cannot be solved by rare earth mining alone. The full chain includes ore, separation, metal conversion, alloying, magnet manufacturing and supporting inputs such as high-purity iron. Any weak link can create dependence.

Hertha Metals is betting that the next phase of US critical materials policy will recognise that reality. If the company can scale production, secure customers and maintain cost discipline, high-purity iron could become a small but essential piece of the domestic magnet supply chain.

The Metalnomist Commentary

Hertha Metals highlights a critical point often missed in rare earth policy: magnet security depends on more than rare earths. High-purity iron, electrical steel and alloy inputs will become strategic materials if US defense and electrification supply chains must move away from China.