Abbreviation (ISO4): Journal of Materials Engineering
Editor in chief: Xiangbao CHEN
Journal of Materials Engineering >
Research progress in failure behavior of protective coatings on surface of continuous casting mould
Received date: 2022-11-29
Revised date: 2023-08-21
Online published: 2024-03-10
The continuous casting mould is the most crucial core component of the continuous casting production line,which undertakes the important tasks of cooling,heat conduction,abrasion resistance and high-precision forming of the billet surface during the high-speed vibration drawing process of the molten steel. Based on the engineering application practice of mould surface protective coatings in domestic steel plants, the advantages,disadvantages and developing trends of electroplated alloy coatings and thermal spray coatings on the surface of mould copper plate were summarized,as well as the main failure forms and formation mechanisms at different locations of mould surface after service under actual working conditions,providing the basis for optimizing the design of coating compositions and corresponding performance in different areas. Moreover,the service results and application advantages of the thermal spraying/vacuum diffusion composite technology developed by the project team in major domestic steel plants were introduced in detail. Finally,it was pointed out that thermal spraying technology will gradually replace electroplating technology and become the core technology of mold surface protection,and high entropy and medium entropy alloy coating has great application potential.
Dongbao HUANG , Zhenqi DONG , Shenshen LI , Zhenlin XU , Hui ZHANG , Xiangjun CHEN , Caiyun XU , Yizhu HE . Research progress in failure behavior of protective coatings on surface of continuous casting mould[J]. Journal of Materials Engineering, 2023 , 51(11) : 52 -60 . DOI: 10.11868/j.issn.1001-4381.2022.001026
Material | Thermal conductivity/(W·m-1·K-1) | Hardness (HB) | Softening temperature/℃ |
---|---|---|---|
Deoxidized copper | 400 | 35-45 | 140-300 |
Cu-Ag,Cu-Be,Cu-Zr binary alloy | ≥370 | 90 | ≥300 |
Cu-Cr-Zr,Cu-Ni-Be ternary alloy | ≥320 | 120 | ≥450 |
Alumina dispersion strengthened copper | ≥350 | ≥130 | ≥900 |
表2 合金电镀层成分、性能和生产应用结果[17-20]Table 2 Composition,performance and production application results of alloy electroplated coating[17-20] |
Coating | Coating performance | |||||
---|---|---|---|---|---|---|
Hardness (HV) | Coefficient of thermal expansion/(10-6 K-1) | Thermal conductivity/ (W·m-1·K-1) | Bonding strength/MPa | Service life of casting number | Service life of casting tons/10 kt | |
Cr | ≥600 | 7 | 60-66 | 200 | ||
Ni | 180-250 | 14-16.7 | 76-84 | ≥220 | 700 | 5 |
NiFe | 320-420 | 14 | 63-88 | ≥220 | 800-1500 | 8-10 |
NiCo | 280-370 | 14 | 75-84 | ≥240 | 2000-3000 | 10-15 |
图3 热喷涂-真空扩散复合涂层制备及应用效果[54-55](a)涂层制备过程;(b)涂层组织;(c)真空扩散处理后界面元素分布;(d)热喷涂-真空扩散复合涂层过钢量16万吨失效表面Fig.3 Preparation and application effect of thermal spraying-vacuum diffusion composite coating[54-55](a)preparation process of coating;(b)coating microstructure;(c)element distribution at interface after vacuum diffusion post-treatment;(d)failure surface of thermal spraying-vacuum diffusion composite coating after casting 160 thousand tons of steel |
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