Microstructures and properties of low-alloy fire resistant steel

Bulletin of materials science

Bimal Kumar Panigrahi¹ 

[1] R&D Centre for Iron and Steel, Steel Authority of India Limited, Ranchi 834 002, India$$R&D Centre for Iron and Steel, Steel Authority of India Limited, Ranchi 834 002, IndiaR&D Centre for Iron and Steel, Steel Authority of India Limited, Ranchi 834 002, India$$

关键词: Fire resistant steel;    thermomechanical processing;    microstructure;    strength;    thermal conductivity.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Microstructures and properties of weldable quality low-alloy fire resistant structural steels (YS: 287�??415 MPa) and TMT rebar (YS: 624 MPa) have been investigated. The study showed that it is possible to obtain two-thirds of room temperature yield stress at 600°C with 0.20�??0.25% Mo and 0.30�??0.55% Cr in low carbon hot rolled structural steel. Microalloying the Cr�?�Mo steel by niobium or vanadium singly or in combination resulted in higher guaranteed elevated temperature yield stress (250�??280 MPa). The final rolling temperature should be maintained above austenite recrystallization stop temperature (∼ 900° C) to minimize dislocation hardening. In a quenched and self-tempered 600 MPa class TMT reinforcement bar steel (YS: 624 MPa), low chromium (0.55%) addition produced the requisite yield stress at 600°C. The low-alloy fire resistant steel will have superior thermal conductivity up to 600°C (> 30 W/m.k) compared to more concentrated alloys.

【 授权许可】

Unknown