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11152 Chromizing of 3-Cr Steel

Picture for 11152 Chromizing of 3-Cr Steel
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Product Number: 51300-11152-SG
ISBN: 2011 11152 CP
Author: V Ravi, B Harrison, J Koch, A Ly, A Schissler, B Pint and J Haynes
Publication Date: 2011
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Grade 315 steel (Fe-2.9 Cr--1.7 W- 0.7 Mo -0.3 Mn-0.3 Si-0.2 V- 0.1 Ni-0.13 C-0.01 N) was chromized by the halide-activated pack cementation (HAPC) process. Key process parameters, i.e., coating temperatures and pack compositions, were investigated. Ammonium chloride-activated packs in the 700-1000°C range produced coatings nominally in the 1-8 µm range, as determined by optical and scanning electron microscopy (SEM). Coatings applied in the 900-1000°C temperature range resulted in Cr-rich coatings. The predominant phase in the coating was identified as Cr23C6 by X-ray diffraction. In addition, the presence of chromium nitride, Cr2N, was observed in the coating.

Key words: Halide-activated pack cementation, grade 315 steel, coatings, chromizing, corrosion, super-bainitic steel
Grade 315 steel (Fe-2.9 Cr--1.7 W- 0.7 Mo -0.3 Mn-0.3 Si-0.2 V- 0.1 Ni-0.13 C-0.01 N) was chromized by the halide-activated pack cementation (HAPC) process. Key process parameters, i.e., coating temperatures and pack compositions, were investigated. Ammonium chloride-activated packs in the 700-1000°C range produced coatings nominally in the 1-8 µm range, as determined by optical and scanning electron microscopy (SEM). Coatings applied in the 900-1000°C temperature range resulted in Cr-rich coatings. The predominant phase in the coating was identified as Cr23C6 by X-ray diffraction. In addition, the presence of chromium nitride, Cr2N, was observed in the coating.

Key words: Halide-activated pack cementation, grade 315 steel, coatings, chromizing, corrosion, super-bainitic steel
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