Optimization of chemical compositions in low-carbon Al-killed enamel steel produced by ultra-fast continuous annealing

• Published in: Materials characterization 2013-10, Vol.84, p.81-87
• Main Authors: Dong, Futao, Du, Linxiu, Liu, Xianghua, Xue, Fei
• Format: Article
• Language: English
• Subjects: Applied sciences; BORON; Boron segregation; CARBON; CEMENTITE; CHEMICAL COMPOSITION; Cross-disciplinary physics: materials science; rheology; Enamel steel; ENAMELS; Exact sciences and technology; FERRITE; FERRITES; GRAIN BOUNDARIES; HYDROGEN; Hydrogen trapping; MANGANESE SULFIDES; MATERIALS SCIENCE; MECHANICAL PROPERTIES; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Mechanical property; Metals. Metallurgy; MnS inclusion; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Solidification; STEELS
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/j.matchar.2013.07.006

The influence of Mn,S and B contents on microstructural characteristics, mechanical properties and hydrogen trapping ability of low-carbon Al-killed enamel steel was investigated. The materials were produced and processed in a laboratory and the ultra-fast continuous annealing processing was performed using a continuous annealing simulator. It was found that increasing Mn,S contents in steel can improve its hydrogen trapping ability which is attributed by refined ferrite grains, more dispersed cementite and added MnS inclusions. Nevertheless, it deteriorates mechanical properties of steel sheet. Addition of trace boron results in both good mechanical properties and significantly improved hydrogen trapping ability. The boron combined with nitrogen segregating at grain boundaries, cementite and MnS inclusions, provides higher amount of attractive hydrogen trapping sites and raises the activation energy for hydrogen desorption from them. •We study microstructures and properties in low-carbon Al-killed enamel steel.•Hydrogen diffusion coefficients are measured to reflect fish-scale resistance.•Manganese improves hydrogen trapping ability but decrease deep-drawing ability.•Boron improves both hydrogen trapping ability and deep-drawing ability.•Both excellent mechanical properties and fish-scale resistance can be matched.