Metallus lands $995m HF-1 steel contract

Metallus has received a five-year US defence contract with a maximum value of $995 million to supply High Fragmentation 1 steel, securing a specialised upstream material used in large calibre artillery ammunition. The Defense Logistics Agency award runs through 24 September 2031 and was placed on a sole-source basis under an industrial mobilisation authority.

HF-1 is not a finished projectile. It is a specialised steel alloy used to manufacture ammunition bodies, including the 155mm M795 high explosive projectile and M1128 extended range projectile identified in US Army programme material. Steel produced in Canton must subsequently pass through forming, machining, heat treatment, inspection, loading, assembly, and final acceptance before it becomes part of a completed round.

The $995 million figure represents the maximum value of the contracting arrangement rather than an immediate purchase of that amount. The government announcement does not establish that the full ceiling will be spent, nor does the headline value translate directly into a defined number of artillery rounds. Actual material demand will follow ammunition production requirements over the contract period.

The award follows a substantial expansion at Metallus’ Canton, Ohio, facilities. Earlier in September, the US Army and the company commissioned a new bloom reheat furnace, roller furnace, and supporting manufacturing equipment intended to increase HF-1 production. At full operational capacity, the Army says the expanded site will be able to produce enough of the alloy to support more than 120,000 155mm metal parts each month.

That output target illustrates the intended scale but also the number of production stages that sit between steelmaking and a serviceable round. HF-1 chemistry and mechanical properties must first remain within specification across repeated heats. Material then passes through conversion and machining processes before projectile bodies undergo further dimensional and material inspection. Propellant charges, explosives, fuzes, packaging, storage, and transport capacity must expand alongside the metal parts if additional steel output is to increase finished ammunition deliveries.

The alloy has to balance properties that are difficult to achieve simultaneously. A projectile body must withstand acceleration and mechanical loading during gun launch while later producing the required fragmentation behaviour after detonation. Material consistency therefore affects both manufacturability and ammunition performance, making chemistry control, heat treatment, traceability, and inspection integral to the production route.

Metallus has produced HF-1 in the United States since 1993, according to the Army. That long production history reduces the need to create a new qualified supplier from scratch, but expanding capacity still requires new equipment to reach stable production rates and demonstrate that additional throughput does not weaken process control. Furnaces, rolling equipment, inspection systems, and material handling all need to perform consistently as monthly volumes increase.

The programme sits within a wider US effort to expand 155mm ammunition capacity at several stages simultaneously. Hanwha’s proposed Pine Bluff manufacturing campus is aimed at propellant charges and base bleed units, while separate investments elsewhere address projectile bodies, explosives, energetics, and loading. The programmes are complementary because a shortage at any one stage can limit the output of the entire ammunition chain.

That dependence makes an upstream steel contract more consequential than its position in the production sequence suggests. Additional loading capacity cannot compensate for a shortage of projectile bodies, just as a larger supply of HF-1 has limited effect if forging, machining, filling, fuze, or propellant production becomes constrained. Capacity plans need the separate production rates to rise in a usable sequence.

The five-year agreement also gives Metallus a longer demand framework for maintaining specialised equipment, qualified processes, and skilled operators. Defence alloys produced intermittently can be difficult to sustain economically if equipment and expertise have to be rebuilt between orders. A longer contracting route can reduce that risk even where annual volumes still vary.

The September contract consequently connects two industrial measures: physical capacity already commissioned in Canton and a government procurement route extending to 2031. The next meaningful indicator will be realised HF-1 output and the rate at which downstream metal parts, energetics, and loading plants convert that additional material into accepted ammunition.