The development of high-strength cast modular structures for defense or dual-use equipment contributes to the spread of Wartime conditions make research aimed at increasing the country's defense capabilities a priority. It is also necessary to intensify efforts to create materials with increased properties, develop effective methods, technical means and technologies to increase the resource of various equipment and structures, both military and civilian. The development of high-strength cast modular structures for defense or dual-use equipment contributes to the spread of advanced foundry technologies in the field of the defense-industrial complex. In the work, the design of the modular trawl was improved by switching from welded parts to cast modules (from two parts), which by weight are available for assembling these precise cast iron castings in the field, and when manufactured for operation in extreme conditions, their additional strengthening by heat treatment is recommended. A new type of heat treatment is proposed with scientific and technological justification - hardening of cast working bodies to achieve differential hardness of their surfaces, which in conditions of wear will lead to self-sharpening of working bodies of earthmoving and soil processing equipment. Also given are examples of details of modular constructions made by precision casting on patterns that are gasified (Lost Foam Casting, LFC). These examples of castings are, in fact, examples of parts - replacement modules that replace worn parts. Their production is developed using the LFC method, often in a cast state with holes for fastening, they practically do not require mechanical processing. Like the discussed trawls, plows, cultivators, disk-chisel harrows are installed in rows to modern powerful tractors. Teeth for buckets of excavators or feed conveyors are also mounted in rows. The modular structure allows the replacement of damaged modules (as consumables) with new or more advanced ones with minimal delay in the operation of the main supporting structures associated with the drive mechanism or machine.

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