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Abstract <p>To obtain a homogeneous pearlitic microstructure in coil‑rolled product made of ShKh15 steel, a continuous heat‑treatment regime with two‑stage cooling was developed on the Stelmor line of a 370/150 wire‑rod mill. Wire rod 5.5–18.5 mm in diameter, after homogenizing annealing of NLZ with a cross‑section of 250 × 300 mm, was investigated. The initial cooling temperature in the coil‑former zone was taken as 870&#xa0;±&#xa0;20°C. Thereafter the rod was cooled on the Stelmor roller conveyor with subsequent holding under thermally insulating covers. The developed regime guarantees diffusional transformation of austenite and produces a ferrite–cementite mixture of sorbitic pearlite with minor (less than 5%) areas of fine‑ and medium‑lamellar pearlite. Subsequent spheroidizing annealing of the rod meets the requirements of State standard GOST 801–2022 with respect to microstructure quality indicators and mechanical properties.</p>

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Development of a Continuous Cooling Technology for Rolled Stock of ShKh15 Steel to Obtain a Fine Pearlitic Structure

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • S. A. Savchenko

摘要

Abstract

To obtain a homogeneous pearlitic microstructure in coil‑rolled product made of ShKh15 steel, a continuous heat‑treatment regime with two‑stage cooling was developed on the Stelmor line of a 370/150 wire‑rod mill. Wire rod 5.5–18.5 mm in diameter, after homogenizing annealing of NLZ with a cross‑section of 250 × 300 mm, was investigated. The initial cooling temperature in the coil‑former zone was taken as 870 ± 20°C. Thereafter the rod was cooled on the Stelmor roller conveyor with subsequent holding under thermally insulating covers. The developed regime guarantees diffusional transformation of austenite and produces a ferrite–cementite mixture of sorbitic pearlite with minor (less than 5%) areas of fine‑ and medium‑lamellar pearlite. Subsequent spheroidizing annealing of the rod meets the requirements of State standard GOST 801–2022 with respect to microstructure quality indicators and mechanical properties.