A. B. Sychkov

Morphology of the γ → α recrystalllization front with diffusional change in composition of complex iron alloys

The formation of the phase-transformation front in complex iron alloys during decarburization is studied. The influence of the main alloying element (tungsten) on the morphology of the recrystallization front in γ + Me6C → α transformation is analyzed; this transformation is responsible for diffusional change in composition in isothermal conditions.

Ensuring complete scale removal from wire rod before drawing

Low-temperature coiling in the Stelmor line (∼850°C) is best for chemical scale removal. In that case, thin, dense scale is formed, without peeling, spots, or blisters. For low-carbon wire rod, the plasticity declines monotonically, while the strength increases. For high-carbon wire rod, the microstructure is unsatisfactory: tempering sorbite and also bainite and pearlite of reduced dispersity. (The optimum scale consists of wustite.) With increase in coiling temperature (950–1000°C), mechanical scale removal is best, on account of the difference in thermal expansion of the scale and the metal. In storage and prolonged transportation, blisters and scale-free sections may lead to corrosion and, on etching, to overetching of the metal.

Improvement of the structure and properties of reinforcement of strength class 500

The effect of chemical composition (chromium, nickel, copper, vanadium, molybdenum, nitrogen) and heat treatment regime in a line on weldable reinforcement of strength class 500 structure formation and properties (with respect to yield strength) is considered. High steel alloying efficiency with the abovementioned elements is demonstrated, in spite of making the steel more expensive. In a number of cases, preparation of a set of structural, mechanical and service properties is only possible with the use of alloying elements, which strengthen steel either by solid solution or dispersion mechanisms.

Structure formation in the accelerated cooling of rolled reinforcement

The structure and metallic properties of hot-rolled rolled reinforcement (strength class 400) made from moderate-carbon Si-Mn and manganese steel are analyzed. Thermomechanical treatment is proposed for improvement in these characteristics.

A decade of quality steel production: Developing a production technology for steel used in metal-cord manufacture

The introduction of high-carbon wire-rod production at OAO Moldavskii Metallurgicheskii Zavod is considered, with particular attention to wire rod for the production of metal cord. The influence of various factors—the chemical composition of the steel, its content of nonmetallic inclusions, its macrostructure and microstructure, decarburization, surface defects, and the scale—on wire rod performance is considered, individually and in aggregate. An effective production technology is developed, including steel production, ladle treatment, casting, rolling, and thermomechanical treatment of the wire rod for metal-cord production.

Production of wire rod for high-strength reinforcing cord

Improvement in the microstructure and performance of wire rod for the production of high-strength reinforcing cord is considered, To suppress undesirable structures (structure-free cementite and martensite), the use of high-carbon steel microalloyed with vanadium and/or chromium is recommended, as well as thermomechanical treatment of the wire rod.