Experimental schemes of spray water cooling process.

<p>Experimental schemes of spray water cooling process.</p

Welded positions and arrangement of thermocouples on the inner and outer wall of the steel pipe.

<p>Welded positions and arrangement of thermocouples on the inner and outer wall of the steel pipe.</p

Heat Transfer Modeling of an Annular On-Line Spray Water Cooling Process for Electric-Resistance-Welded Steel Pipe

<div><p>On-line spray water cooling (OSWC) of electric-resistance-welded (ERW) steel pipes can replace the conventional off-line heat treatment process and become an important and critical procedure. The OSWC process improves production efficiency, decreases costs, and enhances the mechanical properties of ERW steel pipe, especially the impact properties of the weld joint. In this paper, an annular OSWC process is investigated based on an experimental simulation platform that can obtain precise real-time measurements of the temperature of the pipe, the water pressure and flux, etc. The effects of the modes of annular spray water cooling and related cooling parameters on the mechanical properties of the pipe are investigated. The temperature evolutions of the inner and outer walls of the pipe are measured during the spray water cooling process, and the uniformity of mechanical properties along the circumferential and longitudinal directions is investigated. A heat transfer coefficient model of spray water cooling is developed based on measured temperature data in conjunction with simulation using the finite element method. Industrial tests prove the validity of the heat transfer model of a steel pipe undergoing spray water cooling. The research results can provide a basis for the industrial application of the OSWC process in the production of ERW steel pipes.</p></div

Inner wall temperature cooling curves of steel pipe for 5s spraying.

<p>Inner wall temperature cooling curves of steel pipe for 5s spraying.</p

Sampling and dimension of tensile specimen.

<p>Sampling and dimension of tensile specimen.</p

Chemical compositions of J55 ERW steel pipe (%).

<p>Chemical compositions of J55 ERW steel pipe (%).</p

Schematic diagram of cooling experimental platform for steel pipe.

<p>Schematic diagram of cooling experimental platform for steel pipe.</p

Internal structure of cooling box.

<p>Internal structure of cooling box.</p

Mechanical properties and cooling temperatures at different spraying pressures.

<p>Mechanical properties and cooling temperatures at different spraying pressures.</p

Inner wall temperature cooling curves of steel pipe for 5s spraying.

<p>Inner wall temperature cooling curves of steel pipe for 5s spraying.</p