Effect of Water Vapor During Secondary Cooling on Hot Shortness in Fe-Cu-Ni-Sn-Si Alloys

Sampson, Erica; Sridhar, Seetharaman

doi:10.1007/s11663-014-0112-1

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…9,10) As a consequence of the oxidation of elements with higher oxygen affinity, the Cu concentration at the steel/scale interface may steadily increase and, finally, a liquid metal Cu-rich phase may form and penetrate the steel along the grain boundaries, causing micro-defects that can lead to surface cracking due to subsequent stressing, e.g., during hot-rolling. 8,[11][12][13][14][15][16][17][18][19][20][21][22][23][24] In contrast to Sn and Sb, the presence of Ni can counteract this phenomenon as it increases the solubility of Cu in austenite and also the melting point of the Cu-rich phases. 6-8, 25, 26) Another risk for forming a low melting phase during high-temperature oxidation results from the presence of Si in steel.…”

Section: Introductionmentioning

confidence: 99%

Influence of Silicon and Tramp Elements on the High-temperature Oxidation of Steel in Direct Casting and Rolling Processes

Gaiser,

Presoly,

Bernhard

et al. 2024

ISIJ Int.

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Oxidation processes are unavoidable in continuous casting and further hot processing of steel. A deeper understanding of the occurring phenomena such as intergranular oxidation and liquid metal infiltration of grain boundaries is essential to continuously improve the quality of the products. In this study, oxidation experiments were performed with simultaneous thermal analysis for two thin slab casting and rolling applications under near-process conditions up to the point prior to the first reduction stage. The experiments were performed for two low-carbon steels contaminated with undesirable tramp elements (Cu, Sn, …). In addition, the two steels contain Silicon at different levels. The results show that for the "Endless Strip Production" process (ESP), intergranular oxidation is significantly less pronounced compared to a "Thin Slab Casting and Rolling process" with a gasfired tunnel furnace (TSCR TF). Due to the short process time at high temperatures in the ESP process, hardly any liquid metal infiltration by copper appears. In low silicon steel, intergranular oxidation results from various oxides, and liquid metal infiltration appears simultaneously in the TSCR TF process. Furthermore, the yield loss from oxidation is significantly higher in the TSCR TF process. The change from a natural gas combustion atmosphere to a hydrogen combustion atmosphere further increases the oxidation rate and results in a higher mass loss.

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Section: Introductionmentioning

confidence: 99%

Influence of Silicon and Tramp Elements on the High-temperature Oxidation of Steel in Direct Casting and Rolling Processes

Gaiser,

Presoly,

Bernhard

et al. 2024

ISIJ Int.

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Development of Manufacturing Technologies to Increase Scrap Steel Recycling Into New Tires

Sridhar,

Rajan,

Radulescu

et al. 2024

Technology Innovation for the Circular Economy

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Sensitization and Mechanical Response of Cu‐Containing Steel Rods

Acharya,

Gandra,

Shyrokykh

et al. 2024

steel research int.

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The iron and steel manufacturing sector significantly adds to global greenhouse gas emissions, caused primarily by the carbothermic reduction of iron ore. Recycling scrap steel offers an effective decarbonization strategy but introduces impurities like copper (Cu) that can negatively impact mechanical properties. This study investigates the effects of Cu content and heat treatment on the mechanical performance and sensitization of steel wire rods for tire manufacturing. Steel rods with 0.04 and 0.21 wt% Cu are heated to 1050 or 1200 °C, then air quenched, or furnace cooled. Tensile testing coupled with microscopic analysis is used to evaluate mechanical properties and assess the sensitization effects. Higher Cu content leads to larger sensitized zones with increased Cu precipitation along grain boundaries. Ductility and toughness, crucial for wire drawability, are found to be reduced, despite higher ultimate strength. Slower furnace cooling is seen to result in smaller sensitized zones compared to air quenching, suggesting a pivotal role of cooling rate in sensitization control. The findings provide insights into optimize heat treatment parameters and Cu content limits, balancing mechanical performance and maintaining drawability for enhanced scrap steel recycling in tire production.

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Effect of Water Vapor During Secondary Cooling on Hot Shortness in Fe-Cu-Ni-Sn-Si Alloys

Cited by 4 publications

References 15 publications

Influence of Silicon and Tramp Elements on the High-temperature Oxidation of Steel in Direct Casting and Rolling Processes

Influence of Silicon and Tramp Elements on the High-temperature Oxidation of Steel in Direct Casting and Rolling Processes

Development of Manufacturing Technologies to Increase Scrap Steel Recycling Into New Tires

Sensitization and Mechanical Response of Cu‐Containing Steel Rods

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