Study of structure of high-strength cold-resistant steel after quenching and tempering

IF 0.6 Q4 METALLURGY & METALLURGICAL ENGINEERING

CIS Iron and Steel Review Pub Date : 2021-12-29 DOI:10.17580/cisisr.2021.02.11

P. P. Polteskov, I. Yakovleva, A. S. Kuznetsova, N. Koptseva, O. Nikitenko

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Abstract

At present time it is expedient to use high-strength weldable structural steels with guaranteed yield strength exceeding 600 MPa for manufacture of lifting and transportation equipment as well as mining machines in Russia and worldwide. Technical and economical efficiency of use of highstrength steels concludes in lowering of mass and increase of constructions bearing capacity, as well as in rise of their service life due to increased strength and cold resistance (down to −60 °С) [1–4]. It was established based on the previously conducted investigations of the new weldable high-strength steel 20G2SMRA with increased cold resistance [5, 6], that quenching from the temperature 860 °С and consequent high tempering at the temperature 600 °С is the optimal procedure of strengthening heat treatment of rolled sheet metal. The developed technology included processing of sparingly alloyed 20G2SMRA steel [5] and heat treatment procedures [6]; it provided achievement of the complex of properties which meet the requirements in structural strength (s0,2 ≥ 600 N/mm2), plasticity and impact strength at low climatic temperatures (−60 °С) of the best foreign analogies. These analogues include Weldox 700 (SSAB, Sweden, EN 10025), Quend 700, Optim 700 QL (Ruukki), shipbuilding steel HY-100, which are delivered after quenching and tempering [7–13]. Study of the structure of rolled sheet metal from the sparingly alloyed 20G2SMRA steel with determination of the required level of strength and cold resistance was the aim of this work. Materials and methods of the research

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高强耐寒钢调质后组织的研究

目前，在俄罗斯和世界范围内，使用保证屈服强度超过600MPa的高强度可焊接结构钢制造起重和运输设备以及采矿机是有利的。使用高强度钢的技术和经济效益在于降低质量和提高结构承载力，以及由于强度和抗寒性（低至−60°С）的提高而提高其使用寿命[1-4]。基于先前对新型可焊接高强度钢20G2SMRA进行的研究，该钢具有更高的抗寒性[5，6]，从860°С温度开始淬火并随后在600°С温度下进行高回火是对轧制金属板进行强化热处理的最佳程序。所开发的技术包括微合金化20G2SMRA钢的加工[5]和热处理程序[6]；它实现了复杂的性能，满足了国外同类产品在结构强度（s0,2≥600 N/mm2）、塑性和低温（−60°С）下的冲击强度方面的要求。这些类似物包括Weldox 700（SSAB，瑞典，EN 10025）、Quend 700、Optim 700 QL（Ruukki）、造船钢HY-100，它们在淬火和回火后交付[7-13]。本工作的目的是研究由微合金20G2SMRA钢轧制的金属板的结构，并确定所需的强度和抗寒性水平。研究材料和方法

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来源期刊

CIS Iron and Steel Review METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

2.50

自引率

12.50%

发文量

期刊介绍： “CIS Iron and Steel Review” is the only Russian metallurgical scientific-technical journal in English, publishing materials about whole spectrum of the problems, innovations and news of foreign iron and steel industry. The mission of this edition is to make foreign specialists aware about scientific and technical researches and development in iron and steel industry in the former USSR countries.