Hertha Metals Raises $133.65 Million for U.S. High-Purity Iron Plant

Hertha Metals’ $133.65 million Series A gives the Texas company a path to build a 10,000-ton U.S. plant for high-purity iron and steel, Interesting Engineering reported, bringing federal industrial funding into a supply chain normally discussed through rare-earth magnets rather than basic metal feedstock.

The planned Hertha Chalyx facility is backed by two sources of capital.

Washington is putting in $65 million through the Industrial Base Analysis and Sustainment program, while Khosla Ventures and Doerr Capital are leading the private side of the round.

The mix makes the plant both a company expansion and a public-sector supply-chain bet.

Chalyx is designed around a problem that sits upstream from finished magnets.

Hertha says the U.S. lacks domestic capacity for the high-purity iron used in rare-earth permanent magnets and relies on imports for almost all of that material.

Without a local feedstock source, efforts to expand U.S.-made magnets remain exposed before assembly even begins.

The material is not a marginal ingredient.

Neodymium-iron-boron magnets are about 70% high-purity iron by weight, and those magnets go into electric vehicles, aircraft and space systems, radar hardware, data centres and other equipment.

That turns a metals project into part of the manufacturing base behind defense, electrification and computing infrastructure.

Hertha is pitching its Flex-HERS process as the operating reason the project can scale.

Instead of moving ore through the traditional coal-heavy blast furnace sequence, the system uses one continuous reactor.

It can take multiple ore grades and use either natural gas or hydrogen to reduce the ore, giving the company more room to work with domestic inputs.

The economics remain company claims, but they are the claims behind the investment case.

Hertha says its route can lower iron and steel production costs by 25% against blast furnaces.

It also says natural gas operation can halve emissions, while hydrogen operation can push the reduction as high as 98%.

Chalyx would make both steel-grade material and magnet-grade high-purity iron.

That dual output matters because federal procurement rules are increasing pressure for U.S.-made magnets, while magnet producers still need qualified suppliers for the metal that goes into them.

The company is not starting from a cold site.

Hertha already runs Pi100, a 360-ton annual demonstration plant in Conroe, Texas, and is working through supplier qualification with large U.S. rare-earth magnet manufacturers.

Chalyx would operate beside that pilot plant after its expected groundbreaking this year.

The scale-up is the decisive shift.

A 10,000-ton Chalyx facility would have nearly 28 times the annual output of Pi100, moving Hertha from demonstration capacity toward an integrated site for steel and magnet feedstock.

For customers, the immediate result would be a domestic high-purity iron source rather than a finished magnet supply chain.

Hertha’s wager is that lower-cost production, ore flexibility and lower-emission operation can make that missing feedstock competitive enough for manufacturers that want U.S.-based inputs for vehicles, defense systems, electronics and data centre equipment.