Non-metallic materials trapped in the solidifying metal. Sand inclusions come from the mold, while slag inclusions originate from the melting process.
Inspectors use these visual aids to determine if a casting is acceptable based on the severity of the surface irregularities, rather than relying on radiography or ultrasonic testing, which are for internal defects [1].
Key Technical Content
In short, this is the industry’s "visual inspection bible." It provides a definitive set of reference photographs for the surface finish of steel castings. It tells you: "Is this defect acceptable, or does this part need to be scrapped or repaired?" mss sp 55 pdf
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: Inspectors compare a 4 in. x 5 in. (100mm x 125mm) area of a casting against these photos to determine if a surface condition is acceptable or rejectable. 2025 Updates : The latest edition expands its scope to include iron and ductile iron castings , providing a unified basis for acceptance. Common Surface Irregularities (12 Types)
Q: What is the purpose of MSS SP 55 PDF? A: The purpose of MSS SP 55 PDF is to provide a comprehensive guide for ensuring the quality and performance of pipe fittings. Non-metallic materials trapped in the solidifying metal
The is a critical document for the valve and fitting industry, officially titled the "Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components – Visual Method for Evaluation of Surface Irregularities."
– Raised, ridge-like irregularities caused by cracks in the sand mold.
It utilizes 60 reference photographs to categorize 12 distinct types of surface irregularities. Defect Categories: Key Technical Content In short, this is the
Digital access to the MSS SP-55 standard is vital for modern industrial workflows for several reasons:
Show defects that exceed the permissible limits. Any casting exhibiting irregularities worse than these photos must be rejected or repaired.