About stainless steel grade 446

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446 stainless steel

Ferritic stainless steel, which has good resistance to high-temperature corrosion and oxidation, is what makes 446-grade stainless steel. The AISI 446 composition of 446 Stainless steel gives it higher heat resistance and excellent resistance to sulfidation, oxidation, and other types of hot corrosion. SS 446 is an alloy with high chromium ferritic characteristics. In SS 446, the ductility loss can be restored with a small temperature increase between 700°C and 800°C. 1.4762 has an affinity for sigma phase embrittlement between 600 and 900 °C., therefore after prolonged application within this temperature range, the ductile values are significantly decreased, especially between 800 and 900 °C. If mechanical stress is present, using steel in this temperature range is not advised.

446 stainless steel is the only alloy with heat resistance that can withstand molten copper and brass, which is an intriguing feature of the material. Due to its AISI 446 composition, it can influence the high ductile-to-brittle transition temperature. Whenever necessary, annealing at 1550–1650°F should be followed by a quick cool. According to the datasheet for 446 stainless steel, it can be easily welded using conventional techniques other than oxyacetylene welding. Heat is susceptible to chrome steels having ferritic characteristics. Therefore, the 446 stainless steel should be fused with the least amount of heat input feasible by employing stringer bead welding, thin electrodes, and low current intensities.
308 Type Welding and SS 446 can be joined so that it does not exhibit scaling resistance on par with the base metal. The AISI 446 composition must be considered while welding in order to account for the different coefficients of thermal expansion of the base and weld metals.

Chemical composition

  • Fe – Balance
  • Cu – 23 – 27
  • Ni – 0.25
  • Mn – 1.5
  • Si –  1
  • Ni – 0.25
  • C –  0.2
  • P – 0.04
  • S – 0.03

Applications

SS 446 is utilised in a variety of applications, such as recuperators, oil burner components, neutral salt pot electrodes, spouts for transporting molten copper alloys, combustion chambers, etc., because it is severely brittle in the temperature range of 700°F to 1000°F.

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