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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Most foundries have the equipment necessary to analyze and report aluminum content.
Standard Specification for Steel Castings, General Requirements, for Pressure-Containing Parts
Combining values from the two systems may result in nonconformance with the standard. Castings, Iron-Nickel-Chromium and Nickel. The thickness of the casting orportion of the casting is an obviousfactor influencing whether embrittlementoccurs, since thicker asmt sectionswill cool more slowly through thecritical temperature range than thinsections.
New Washer Application Search Tool. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. ViewIn Technology for Mechanical Seals. The Adventures of Duke Waters. Steel Castings Suitable for Pressure Service.
The casting configuration can also influence the cooling rate. This abstract is a brief summary of the referenced standard. One of the elements that is sometimes added as a deoxidizer is aluminum, which creates a potential for the formation of aluminum nitride. It is informational 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.
If fracture occurs, it has a rock-candy appearance due to asgm along the prior austenite grain boundaries. Looking for a career in the Valve Industry? The material shall conform to the specified chemical composition requirements.
For example, air-set sand is known to inherently produce molds that cool slower than green-sand molds.
The mechanical test methods and definitions are presented in details. What is the purpose of this requirement? The macroetch test specified in Supplemental Requirement S23 in ASTM A is designed to detect the occurrence of aluminum nitride embrittlement in castings.
Work Item s – proposed revisions of this standard. Awtm, 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. The fracture is often very shiny due to the presence of aluminum nitride platelets on the surface. Although some foundries monitor nitrogen levels in their steel, many do not have the necessary equipment to do this.
When the metal is poured into the casting mold, the oxygen can come out of the solution atm form gas porosity in the castings. Containing Parts, Suitable for Low-Temperature. 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. Pressure-Containing Parts, Suitable for High.
The resulting etched specimen is compared with 10 reference macrographs. Link to Active This link will always route to the current Active version of the standard. New Products Prev Next Rotork: The presence of these elements results in the formation of oxide compounds, which mitigates the formation of oxygen gas bubbles during solidification. These are provided for use when additional testing or inspection is desired ast, apply only when specified individually by the purchaser in the order.
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After machining, each casting shall be tested under specified hydrostatic shell test pressures in the applicable steel rating for which the casting is designed. Ferritic and martensitic steel shall be cooled after pouring to provide substantially complete transformation of austenite prior to heat treatment to enhance mechanical properties. Upcoming Valve Industry Events Reprints. Castings, Austenitic, for Pressure-Containing.
Supplemental Requirement S23 in ASTM A
Texas Manufacturing Expands Modestly, Outlook. 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. Steel Castings, Martensitic Stainless and Alloy, for.
A cross-section of the heaviest section of a sacrificial casting A coupon attached to the heaviest section A coupon removed from directly under a riser or A coupon from the same heat of material removed from a separately cast test block with a thickness representative of the heaviest section of the casting.
Certain elements are known to inhibit the formationof aluminum nitride. An analysis of each heat shall be made by the manufacturer to determine the percentages of the elements specified.
When steel is melted, oxygen and nitrogen can be dissolved in the molten steel.
ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.