Influence of process parameters on scale reduction with H₂

Abstract

A new pickling method that reduces the metal oxide on steel strip using H 2 has been studied through an extensive campaign of experimental tests. The process, referred to as 'acid free pickling', is environmentally friendly and does not use acid. It is most suitable for application to hot rolled low carbon steel strip. Experimental studies are in progress to validate the application of hydrogen on different metals. A elongation, % R el yield strength, N mm 22 R m max, ultimate tensile strength, N mm 22 ß

Continuous reduction of the oxide scale of hot-rolled steel strip in hydrogen

“…Primavera et al . 7 and Tan et al . 4 independently reported the influence of reducing gas composition and reaction temperature on the scale reduction by measuring the thickness of reduced scale.…”

“…1,2 Under the increasing pressure of environmental protection, considerable studies have been done on this green descaling technology in recent years. [3][4][5][6][7][8] Reduction temperature and reducing gas composition are the most important two parameters for the oxide scale reduction. Primavera et al 7 and Tan et al 4 independently reported the influence of reducing gas composition and reaction temperature on the scale reduction by measuring the thickness of reduced scale.…”

“…[3][4][5][6][7][8] Reduction temperature and reducing gas composition are the most important two parameters for the oxide scale reduction. Primavera et al 7 and Tan et al 4 independently reported the influence of reducing gas composition and reaction temperature on the scale reduction by measuring the thickness of reduced scale. Saeki et al 9 studied the temperature dependence of oxide scale reduction in pure hydrogen and found that the reaction rate did not increase monotonously with temperature, but showed a rate minimum around 873 K. Similar reaction rate minimum was also reported in the reduction in many other types of iron oxides, like magnetite 10 and single crystal wüstite.…”

Study on the interface reaction layer of hydrogen reduction hot-rolled high-strength steel hot-dip galvanizing

“…Hot-rolled steel strip is usually descaled before galvanizing. At present, the main way to remove the oxide layer is pickling [5][6][7]. However, pickling will cause serious environmental pollution [8][9][10].…”

Investigation of hot rolled galvanised steel without acid pickling

“…Hudson 9 reported firstly the feasibility of descaling of hot rolled band by hydrogen or carbon. Thereafter, Shi et al 10 and Primavera et al 11 independently reported the reduction in oxide scale on hot rolled strip by hydrogen and carbon monoxide. However, hot dip galvanising was not involved in their research.…”