MSS SP-55-2025 ✓ Most Recent

This Standard Practice is intended to supplement requirements of the ASTM Standard Specifications identified in Section 2, by providing a collection of reference photographs typical of the various surface irregularities common to iron and steel pressure castings, which illustrate generally acceptable and generally rejectable quality. Table 1 of Section 7 is provided to show MSS interpretation as to the relationship between this Standard Practice and the levels of surface quality illustrated by the comparators and the associated photographs of the Castings Technology International (CTI), “Comparators for the Definition of Surface Quality of Steel Castings”.

Application of this Standard Practice for iron castings manufactured utilizing the lost-foam casting process shall be by agreement between the manufacturer and purchaser.

If components with specific visual casting defects are to be exempted from this Standard Practice due to idiosyncrasies in the casting process e.g., iron castings made via the lost foam process, those types of defects and exceptions should be noted on any quotation or product descriptions provided by the manufacturer.

For additional nondestructive examinations defining quality of steel castings, this Standard Practice may be supplemented by the MSS Standard Practices identified in Section 2.