HIGH-TEMPERATURE REACTIONS OF TYPE 304 STAINLESS STEEL IN LOW CONCENTRATIONS OF CARBON DIOXIDE AND CARBON MONOXIDE

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Compatibility studies of type 304 stainless steel in helium containing low concentrations of CO and CO/sub 2/ were conducted. The oxidation rates were insensitive to impurity concentrations between 0.0006--0.3 vol% in the temperature range 400--1000 deg C when P/sub co2/P/sub co/ was less than 0.66. Ratios above this value resulted initially in a slow oxidation rate, but was followed by an accelerated attack. The incubation period for the break-away varied with the P/sub co2//P/sub co/ ratio and the pressure of the two gases. The oxidation reactions proceeded through a selective depletion of chromium from the alloy which increased the carbon ... continued below

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Pages: 49

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Inouye, H. August 29, 1962.

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Compatibility studies of type 304 stainless steel in helium containing low concentrations of CO and CO/sub 2/ were conducted. The oxidation rates were insensitive to impurity concentrations between 0.0006--0.3 vol% in the temperature range 400--1000 deg C when P/sub co2/P/sub co/ was less than 0.66. Ratios above this value resulted initially in a slow oxidation rate, but was followed by an accelerated attack. The incubation period for the break-away varied with the P/sub co2//P/sub co/ ratio and the pressure of the two gases. The oxidation reactions proceeded through a selective depletion of chromium from the alloy which increased the carbon solubility and depletion of nickel which led to the transformation of austenite to ferrite. Parabolic reaction rates were observed for the formation of the protective oxides. Arrhenius plots of rate constants versus 1/T indicated the presence of several oxides which was confirmed by other methods. Carburization or decarburization reactions occurred coincidentally with oxidation and depended upon temperature and (P/sub CO/)/sup 2/ /P/sub CO2/ and the P/sub co2//P /sub CO/. Neither was detected below 600 deg C. Between 600--900 deg C, only carburization occurred and appeared to be mainly dependent on the temperature. Above 900 deg C, both carburization and decarburization occurred depending upon the (P/sub co/)/sup 2//P/sub co2/ and the P/sub co2//P/sub co/. The interactions of the oxidizing and carburization reactions resulted in carbon maxima at a (P/sub co/)/sup 2//P/sub co2/ ratio of 0.227. The results indicate that it may be impractical or unnecessary to reduce impurity gases to levels which do not cause surface reactions. It is concluded that undesirable oxidation and carburization reactions can be eliminated by controlling the ratios of the impurity gases. (auth)

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Pages: 49

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  • Other Information: Orig. Receipt Date: 31-DEC-62

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  • Report No.: ORNL-TM-293
  • Grant Number: W-7405-ENG-26
  • DOI: 10.2172/4804434 | External Link
  • Office of Scientific & Technical Information Report Number: 4804434
  • Archival Resource Key: ark:/67531/metadc1058617

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  • August 29, 1962

Added to The UNT Digital Library

  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 1, 2018, 1:31 p.m.

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Inouye, H. HIGH-TEMPERATURE REACTIONS OF TYPE 304 STAINLESS STEEL IN LOW CONCENTRATIONS OF CARBON DIOXIDE AND CARBON MONOXIDE, report, August 29, 1962; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1058617/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.