Q: A customer has asked whether we can supply carbon and alloy steel valve bodies meeting Supplemental Requirement S23 in ASTM A What is the. fication, shall apply to steel castings for pressure-containing Specification A and SI units for material ordered to parts under each of the following ASTM. Buy ASTM A /AM: SPECIFICATION FOR STEEL CASTINGS, GENERAL REQUIREMENTS, FOR PRESSURE-CONTAINING.
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A complex casting with relatively thin walls may experience slower cooling rates than a simple casting with the same wall thickness because the complex casting will lose heat through the mold less effectively. Heats with severity levels 4 and lower are acceptable.
ViewIn Technology for Mechanical Seals. These are provided for use when additional testing or inspection is desired and apply only when specified individually by the purchaser in the order. Latest Post Popular Links Events. Texas Manufacturing Expands Modestly, Outlook. This compound tends to precipitate in the prior austenite grain boundaries and can result in castings that display loss of ductility that could result in brittle failure of the casting if it is shock-loaded in service.
This abstract is a brief summary of the referenced standard. The resulting etched specimen is compared with 10 reference macrographs. The Adventures of Duke Waters. Historical Version s – view previous versions of standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Supplemental Requirement S23 in ASTM A
In order to avoid castings with excessive gas porosity, the foundry may add deoxidizing elements to the melt. Monitoring Pressure Relief Devices Post: Castings, Austenitic, for Pressure-Containing. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
When the metal is poured into the casting mold, the oxygen can come out of the solution and form gas porosity in the castings. Work Item s – proposed revisions of this standard. If fracture occurs, it has a rock-candy appearance due to fracture along the prior austenite grain boundaries.
After machining, each casting shall be tested under specified hydrostatic shell test pressures in the applicable steel rating for which the casting is designed. The specifications for the common cast steels used in valve bodies do not require analysis or reporting of nitrogen as a standard requirement. New Products Prev Next Rotork: One of the elements that is sometimes added as a deoxidizer is aluminum, which creates a potential for the formation of aluminum nitride.
An analysis of each heat shall be made by the manufacturer to determine the percentages of the elements specified.
Although some foundries monitor nitrogen levels in their steel, many do not have the necessary equipment to do this. Steel Castings Suitable for Pressure Service. This specification covers steel castings, general requirements, for pressure-containing parts.
It has also been found thathigher levels of phosphorus, sulfur,boron, molybdenum and copper inhibitaluminum nitride embrittlement. Containing Parts, Suitable for Low-Temperature. Emerson Astk Acquisition of iSolutions I.
The macroetch test specified in Supplemental Requirement S23 in ASTM A is designed to detect the occurrence of aluminum nitride embrittlement in castings. Castings, Iron-Nickel-Chromium and Nickel. One tension test shall be made from each heat, and shall conform to the tensile requirements specified. Therefore, the nitrogen content of the steel is often not known or reported, and it is possible that enough nitrogen is present to form aluminum nitride.
Ferritic and martensitic steel shall be cooled after pouring to provide substantially complete transformation of austenite prior to heat treatment to enhance mechanical properties. The presence of these elements results in the formation of oxide compounds, which mitigates the formation of oxygen gas qstm during solidification.
Upcoming Valve Industry Events Reprints. Steel Asttm, Ferritic and Martensitic, for Pressure. The thickness of the casting orportion of the casting is an obviousfactor influencing whether embrittlementoccurs, since thicker casting sectionswill cool more slowly through thecritical temperature range than thinsections.
Looking for a career in the Valve Industry? The material shall conform to the specified chemical composition requirements. Emerson Completes Acquisition of iSolutions Inc. It is asfm only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application.
Custom Hydraulic Power Units. The steel shall be made by open-hearth or electric-furnace process, with or without separate refining such as argon-oxygen-decarburization AODunless otherwise designated by the individual specification. New Washer Application Search Tool. Combining values from the atsm systems may result in nonconformance with the standard.
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Standard Specification for Steel Castings, General Requirements, for Pressure-Containing Parts
Stainless Steel, for Pressure-Containing Parts. Test coupons shall be cast from the same heat as the castings represented, except that for investment castings, the test coupons shall be cast in the same type of mold as the castings. Pressure-Containing Parts, Suitable for High. When steel is melted, oxygen and nitrogen can be dissolved in the molten steel.