About the Possibility of Using Nitrocemented Tungsten-Free Steel HGS (EI553) for Precision Parts of Diesel Fuel Equipment

Purpose. Investigation of the effect of nitrocementation at low temperatures of HCG steel in a highly active nitrogencarbon medium on the structure, phase composition and properties to recommend it as a material for precision parts of diesel fuel equipment.

Methods. Nitrocementation at 520 − 600⁰C in an active medium based on carbamide and potassium ferro-sineride ensures the production of solid carbonitride phases on the surface that are resistant to wear in the conditions of operation of precision parts of diesel fuel equipment. 

Results. It has been experimentally shown that the wear resistance of nitrocemented steel HCG is 2.7 − 4.4 times higher than the wear resistance of hardened steel HVG. The achievement of the maximum wear resistance of modified steel is observed when the carbonitride content in the structure is more than 70%. At the same time, the hardness of the worn surface becomes almost equal to the hardness of quartz particles and their abrasive action on such a surface ceases. The intensity of wear of modified parts in such conditions is minimized – by a fraction more compared to parts that have not been subjected to nitrocementation.

Conclusion. The conducted studes have shown that tungsten-free tool steel HCG with surface hardening (modification) by low-temperature nitrocementation can be successfully used for the manufacture of diesel fuel equipment parts instead of traditional tungsten-containing steel HVG.

The use of nitrocemented steel HCG in the mass production of diesel fuel equipment can give a significant economic effect due to the lower cost of steel and increased durability of nitrocemented parts. The choice of one or another nitrocementation mode depends on the technological capabilities of the enterprise producing parts of diesel fuel equipment.

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