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.
|Published (Last):||17 February 2010|
|PDF File Size:||5.91 Mb|
|ePub File Size:||19.98 Mb|
|Price:||Free* [*Free Regsitration Required]|
Texas Manufacturing Expands Modestly, Outlook.
This specification covers steel castings, general requirements, for pressure-containing parts. Steel Castings, Ferritic a7703 Martensitic, for Pressure. One of the elements that is sometimes added as a deoxidizer is aluminum, which creates a potential for the formation of aluminum nitride. Emerson Completes Acquisition of iSolutions I.
qstm Stainless Steel, for Pressure-Containing Parts. The presence of these elements results in the formation of oxide compounds, which mitigates the formation of oxygen gas bubbles during solidification. Custom Hydraulic Power Units.
Standard Specification for Steel Castings, General Requirements, for Pressure-Containing Parts
The steel shall be made by open-hearth or electric-furnace process, with or q703 separate refining such as argon-oxygen-decarburization AODunless otherwise designated by the individual specification. 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.
Admiral Valve Announces Partnership with Diek. Variables That Influence Embrittlement There are a number of variables that influence the potential for this type of embrittlement: The material shall conform to the specified chemical composition requirements. Rigging and Lifting of Large Valves Post: Monitoring Pressure Relief Devices Post: Link to Active This link will always route to the current Active version of the standard.
The macroetch test specified in Supplemental Requirement S23 in ASTM A is designed to detect the occurrence of aluminum nitride embrittlement in castings.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the 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 resulting etched specimen is compared with 10 reference macrographs. In order to avoid castings with excessive gas porosity, the foundry may add deoxidizing elements to the melt.
Upcoming Valve Industry Events Reprints. Historical Version s – view previous versions of standard. Certain elements are known to inhibit the formationof aluminum nitride.
ViewIn Technology for Mechanical Seals.
Supplemental Requirement S23 in ASTM A
Steel Castings Suitable for Pressure Service. It has also been found thathigher levels of phosphorus, sulfur,boron, molybdenum and copper inhibitaluminum nitride embrittlement. 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.
New Products Prev Next Rotork: Although some foundries monitor nitrogen levels in their steel, many do not have the necessary equipment to do this.
E Reference Radiographs for Heavy-Walled 2 to in. The mechanical test methods and definitions are presented in details. What is the purpose of this requirement? This abstract is a asmt summary of the referenced standard. The specifications for the common cast steels used in valve bodies do not require analysis or reporting of nitrogen as a standard requirement.
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 asfm if it is shock-loaded in service.
Castings, Austenitic, for Pressure-Containing. An analysis of each heat shall be made by the manufacturer to determine the percentages of the elements specified.