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Volume 47 期 2，2026 2026年第47卷第2期

  • Overview

    Li Xin, Shi Xiaobin, Wang Yongqiang, Zhen Xingang, Yu Hao, Wang Chuan

    Vol. 47, Issue 2, Pages: 1-12(2026) DOI: 10.20057/j.1003-8620.2025-00176
    摘要：With the rapid development of energy infrastructure， shipbuilding and promotion of China’s “the Belt and Road” strategy， the demand for medium and heavy plates that widely used for containers/pressure vessels， ships， pipelines， etc.，is growing increasingly， and their mechanical properties are also increasingly demanding. Low temperature impact toughness is one of the most important performance indicators. Due to the large thickness， the low temperature toughness value is usually discrete and fluctuating， which is one of the main issues for medium and heavy plate products. In this paper， the main rolling technologies， key manufacturing technologies and mechanical and process performance requirement for medium and heavy plate were reviewed firstly. With the increasing demands for usage and advancements in production equipment and technologies， the requirements for the size and mechanical properties of medium and heavy plates are becoming larger and higher， respectively. Currently， the maximum thickness of heavy plate products can reach 700 mm， and the tensile strength of stably produced high-performance wear-resistant steel plates has reached up to 1 900 MPa， the 1 300 MPa level high strength mechanical steels has also been supplied at the market. And then， the research progress on low temperature toughness of medium and heavy plates， including mechanism， influence factors， and improvement methods， were summarized. The main reason of low temperature toughness fluctuations is the heterogeneity of the microstructures. Improving the homogeneity of the microstructures through composition and process optimization can mitigate the fluctuation of low-temperature impact. Finally， the insufficient aspects for the research on low temperature impact toughness of medium and heavy plate and the future development direction of the technology were pointed out.  
    关键词：Medium and Heavy Plate;Producing Technology;Mechanical Property;Low Temperature Impact Toughness   
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    更新时间：2026-03-03

  • Product Research and Development

    Zhou Faming, Zhu Guojun, Zhao Youxu, Hu Taolin, Ni Yanhong, Ge Rui

    Vol. 47, Issue 2, Pages: 13-18(2026) DOI: 10.20057/j.1003-8620.2025-00156
    摘要：Bainitic non-quenched and tempered steel has broad application prospects in the field of high-strength and tough structural components. On the basis of traditional Mn-Cr series bainitic non-quenched and tempered steel， a new type of bainitic non-quenched and tempered steel has been developed by adding small amounts of Ni and V elements. The synergistic control of multiple elements in steel gives the potential performance advantages of the material， but it is necessary to develop a reasonable forging process to activate these potentials. The high-temperature compression tests under different temperatures （950 ℃-1 150 ℃） and different strain rates （0.01 s⁻¹-10 s⁻¹） were carried out on the Gleeble-3500 thermal simulation testing machine to study the hot deformation behavior of this bainitic non-quenched and tempered steel. Furthermore， an Arrehenius constitutive equation containing the Z parameter was established， which can well predict its high-temperature flow behavior. In addition， based on the dynamic material model and microstructure verification， a hot working diagram under a true strain of 0.7 was established. The obtained optimal hot working process range was as follows， the deformation temperature range was 1 050 ℃-1 150 ℃， and the strain rate range was 0.01 s⁻¹-0.22 s⁻¹. The strain rate of hot forging should be lower than 0.22 s⁻¹ to avoid the flow instability phenomenon during the deformation process.  
    关键词：Non-quenched and Tempered Steel;Thermal Compression;Constitutive Equation;Thermal Processing Map;Microstructure   
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    更新时间：2026-03-03

  • Product Research and Development

    Yang Chuntian, Zhai Jiaolong, Kong Xiangwei, Gao Lei, Yin Qing, Wu Xiaolin

    Vol. 47, Issue 2, Pages: 19-26(2026) DOI: 10.20057/j.1003-8620.2025-00157
    摘要：At present the commonly used mining chain steel 23MnNiMoCr54 contains high valuable elements such as Ni and Mo， so the cost is high， which limits its wide application.In this study， a new type of economical mining chain steel was designed by reducing the contents of Ni and Mo， regulating the contents of Mn and Cr， and adding Nb microalloying. Through mechanical property tests， hardenability tests， uniform corrosion and stress corrosion experiments， combined with chain performance tests， the performance differences between the new steel and 23MnNiMoCr54 steel were compared and analyzed. The results show that the mechanical properties and hardenability indexes of the new steel meet the standard requirements. In simulated mine water， its uniform corrosion rate has no significant difference from that of the control steel， while the stress corrosion sensitivity factor and hydrogen embrittlement coefficient are better， and the hydrogen-induced cracking resistance is improved. The chain made of the new steel has a breaking load of 1 710 kN and a fatigue life of more than 6.7×10⁴ cycles， meeting the C-level chain standard in GB/T 12718-2009.  
    关键词：Mining Chain;Corrosion;Hydrogen Induced Cracking;Mechanical Properties;Low Cost   
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  • Product Research and Development

    Zhao Jian, Yang Renqiang, Wang Liqing, Huang Yan

    Vol. 47, Issue 2, Pages: 27-31(2026) DOI: 10.20057/j.1003-8620.2025-00127
    摘要：To develop high-quality H13 hot work die steel continuous-casting billets and address quality issues such as segregation and shrinkage cavities， a process involving converter + LF + RH + continuous casting + rolling was adopted. By employing dual-block slide gate in the converter， full-process diffusion deoxidation during refining， and controlling the basicity of refining slag， as well as utilizing full-process protective casting and pulse magnetic oscillation （PMO） solidification homogenization technology and other auxiliary methods during continuous casting， industrial production of H13 hot work die steel was successfully achieved on a ϕ300 mm continuous casting machine. The results showed that the process test could achieve high purity， low segregation， and uniform microstructure production of H13 hot work die steel. The steel chemical composition was accurately controlled， and corresponding indicators such as macrostructure， element segregation， and inclusions all met the technical requirements. When the PMO voltage was 185 V and the power was 42 kW， the shrinkage cavity grade of H13 steel billets could be effectively reduced from grade 2.0 to below grade 1.0， improving the carbon segregation in the core of H13 steel billets， with the average carbon segregation index in the core decreasing from 1.2 to below 1.1.  
    关键词：Pulse Magneto Oscillation（PMO）;H13 Hot Work Die Steel;Continuous Casting;Protective Casting   
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