The oxidized residual strength for two nuclear graphite grades, fine-grained IG-110 and medium-grained NBG-18, were determined over a mass loss range of 0% to 10% for three different oxidation temperatures. This study addresses the critical licensing issue of determining oxidized strength of graphite core components within the design rules of the American Society of Mechanical Engineers (ASME) Boiler Pressure and Vessel Code over a range of oxidation temperatures from 550 °C to 750 °C. Results generally demonstrate low-temperature oxidation to have a 30% greater strength reduction than similar mass losses at higher oxidation temperatures. These differences are attributed to whether the graphite oxidizes primarily within the kinetic-controlled regime or the diffusion-controlled regime which dictate the level of oxidation penetration depth into the interior microstructure. Finally, this study presents a new test method for determining mechanical compression strength from previously oxidized graphite material. This test procedure is based upon two approved American Society for Testing and Materials (ASTM) standards, ASTM D7542 and C695, and combines the requirements for both standards. It is hoped that this new test method can assist ASME BPVC users in determining oxidized residual strength since there are currently no approved standard for conducting such tests.

对于三种不同的氧化温度，在0％至10％的质量损失范围内，确定了两种核石墨等级（细粒IG-110和中粒NBG-18）的氧化残余强度。这项研究解决了在550°C至750°C的氧化温度范围内，根据美国机械工程师协会（ASME）锅炉压力和容器规范的设计规则确定石墨芯部件氧化强度的关键许可问题。结果通常表明，与较高的氧化温度下的类似质量损失相比，低温氧化的强度降低幅度大30％。这些差异归因于石墨主要在动力学控制范围内还是在扩散控制范围内氧化，这决定了氧化渗透深度进入内部微结构的水平。最后，这项研究提出了一种新的测试方法，用于确定先前氧化的石墨材料的机械抗压强度。此测试程序基于两项经批准的美国材料与试验学会（ASTM）标准ASTM D7542和C695，并结合了这两个标准的要求。希望这种新的测试方法可以帮助ASME BPVC用户确定氧化残余强度，因为目前尚无批准的标准可进行此类测试。这项研究提出了一种新的测试方法，用于确定先前氧化的石墨材料的机械抗压强度。此测试程序基于两项经批准的美国材料与试验学会（ASTM）标准ASTM D7542和C695，并结合了这两个标准的要求。希望这种新的测试方法可以帮助ASME BPVC用户确定氧化残余强度，因为目前尚无批准的标准可进行此类测试。这项研究提出了一种新的测试方法，用于确定先前氧化的石墨材料的机械抗压强度。此测试程序基于两项经批准的美国材料与试验学会（ASTM）标准ASTM D7542和C695，并结合了这两个标准的要求。希望这种新的测试方法可以帮助ASME BPVC用户确定氧化残余强度，因为目前尚无批准的标准可以进行此类测试。