The paper analyzes the effect of preliminary deformation of continuously cast billets (CCB) made of chromium-containing grades of steel by radial-shear rolling (RDR) on the structure and properties of seamless pipes. A bar stock measuring 105 mm in diameter was obtained using an RDR mill at large feed angles (β = 21°). A comparative analysis of the microstructure of the initial CCB and hotrolled bars has shown that radial-shear rolling enables intensive refinement of the structure of continuously cast billets, and ensures a high-quality (70 to 90%) work-up of the cast structure at reduction ratios of 2.0 to 2.2. A pipe-rolling mill (PRM) installed at the Pervoural’sk New Pipe Plant JSC (PNPP JSC) was used to obtain seamless pipes from the deformed bars, and the mechanical properties of such pipes were studied. It was found that the pipes obtained from the experimental billets are fully compliant with the ISO 11960:2004 requirements for strength group J55 (σ_t > 517 MPa; σ_0.2 > 379 MPa; δ > 16%). In addition, the level of plastic properties of the experimental pipes (based on present elongation δ₅, %) exceeds the ISO 11960:2004 requirements by 1.6–1.8 times. To achieve a comparable level of properties using the existing technology, an additional heat treatment (HT) is required, which points to the potential advantages of using RDR pre-deformed billets to obtain seamless pipes with the required properties.

本文分析了含碳钢制成的连铸坯通过径向剪切轧制（RDR）进行的初步变形对无缝管结构和性能的影响。使用RDR轧机以大进给角（β= 21°）获得了直径为105毫米的棒料。对初始CCB和热轧棒材的显微组织进行的比较分析表明，径向剪切轧制可以对连续铸造坯料的组织进行强化精炼，并确保铸造组织的高质量（70％至90％）后加工缩小比例为2.0到2.2。使用安装在Pervoural'sk New Pipe Plant JSC（PNPP JSC）上的轧管机（PRM）从变形钢筋获得无缝管，并研究了这种管的机械性能。_t > 517兆帕; σ _0.2 > 379兆帕; δ> 16％）。此外，实验管的塑料性能的水平（基于所存在的伸长δ ₅，％）超过ISO 11960：由1.6-1.8倍2004的要求。为了使用现有技术达到可比较的性能水平，需要进行额外的热处理（HT），这表明使用RDR预变形的钢坯以获得具有所需性能的无缝管的潜在优势。