A new C-shape ring specimen with fixed constraints (CRSFC) was developed to evaluate material creep properties for small tubular components like steam pipes and gas turbine recuperators. By combining three-point bending and small ring creep tests, researchers established a conversion relationship to relate CRSFC data to traditional uniaxial creep test results. Creep parameters obtained from CRSFC tests closely matched those from uniaxial tests, with a maximum error of 22.6%. The study also found that the length of the straight edge had a negligible effect on the test results, and recommended specific values for the indenter radius, eccentric displacements, and friction coefficient to minimize other parameter effects in CRSFC creep tests.