Quality control of high temperature and high pressure valve castings

The process scheme is put into production after being determined by casting CAE simulation, and all valve castings are qualified and delivered to customers for use. The chemical composition test results are shown in Table 1, the mechanical property test results are shown in Table 2, and the metallographic test results and ferrite test results are shown in Table 3 and table 4.

Heat numberSample NoCSiMnSPCrNiMoNb
C13-2063C6880.060.710.710.0070.0218.39.520.070.049
C13-2103C7480.070.740.670.0050.0218.919.330.080.059
Sample NoSo/mm2Temperature / ℃ReL/MPaRm/MPaALo/%Z/%Executive standard
3C688124.49room temperature29053046.566.0ASTM A351
3C748124.69room temperature27551553.559.5ASTM A351
Heat numberSample NoABCDAustenite grain sizeMicrostructureExecutive standard
C13-2063C6880.50.50.51.03.0Austenite + ferriteASTM E381
C13-2103C7480.50.50.52.05.0Austenite + ferriteASTM E381
Heat numberSample NoFerrite content f /%
C13-2063C6884.5 4.6 5.0 4.6 4.8 5.0
C13-2103C7484.9 5.0 5.5 4.8 5.5 5.4

Intergranular corrosion results are qualified (sulfuric acid copper sulfate method). After the valve casting surface is polished to meet the flaw detection requirements, it shall be polished according to ASME B16 34. 100% radiographic inspection was conducted for the full volume of valve castings, no crack defects were found, and the casting defects such as air hole, shrinkage cavity and sand inclusion met the requirements of grade 2; 100% liquid penetrant testing is conducted on the surface of valve castings according to ASTM e165. There are no crack casting defects. The length of any linear display is not more than 2 mm, the size of a single circular casting defect is not more than 4 mm, and the cumulative length of dense casting defects (referring to concentrated defects with a size less than 0.5 mm) is at any 100 mm × Not more than 2 mm in an area of 100 mm.

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