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. 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. ASTM A/AM: Standard Specification for Steel Castings, General Requirements, for Pressure- Containing Parts.
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Latest Post Popular Links Events. 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. What is the purpose of this astj Stainless Steel, for Pressure-Containing Parts.
This specification covers steel castings, general requirements, for pressure-containing parts. Steel Castings Suitable for Pressure Service.
Supplemental Requirement S23 in ASTM A
New Washer Application Search Tool. 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.
The presence of these elements results in the formation of oxide compounds, which mitigates the formation of oxygen gas bubbles during solidification. One tension test shall be made from each heat, and shall conform to the tensile requirements specified. 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.
The mold material can also influence the a73 rate. Looking for a career in the Valve Industry? Steel Castings, Martensitic Stainless and Alloy, for. ViewIn Technology for Mechanical Seals. Custom Hydraulic Power Units. Ast, abstract is a brief summary of the referenced standard.
Valve Basics Training to Expand in asfm Castings, Iron-Nickel-Chromium and Nickel. 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.
These are provided for use when additional testing or inspection is desired and apply only when specified individually by the purchaser in the order. Variables That Influence Embrittlement There are a number of variables that influence the potential for this type of embrittlement: Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Although some foundries monitor nitrogen levels in their steel, many do not have the necessary equipment to do this. 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 casting configuration can also influence the cooling rate. 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.
When the metal is poured into the casting mold, the oxygen can come out of the solution and form gas porosity in the castings. Upcoming Valve Industry Events Reprints. E Reference Radiographs for Heavy-Walled 2 to in.
Work Item s – proposed revisions of this standard. Containing Parts, Suitable for Low-Temperature. Preparing for a Plant Outage.
The mechanical test methods and definitions are presented in details. Heats with severity levels 4 and lower are acceptable. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. An analysis of each heat shall be made by the manufacturer to determine the percentages of the elements specified. Castings, Austenitic, for Pressure-Containing. The material shall conform to the specified chemical composition requirements.
Steel Castings, Ferritic and Martensitic, for Pressure. In order to avoid castings with excessive gas porosity, the foundry may add deoxidizing elements to the melt. When steel is melted, oxygen and nitrogen can be dissolved in the molten steel. Emerson to Automate Sonatrach Gas Processing. Electric Actuator Commissioning Post: 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.
One of the elements that is sometimes added as a deoxidizer is aluminum, which creates a potential for the formation of aluminum nitride. Smart, Data-Driven and Agile Post: The fracture is often very shiny due to the presence of aluminum nitride platelets on the surface.
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. Pressure-Containing S703, Suitable for High. Most foundries have the equipment necessary to analyze and report aluminum content.
It has also been found thathigher levels of phosphorus, sulfur,boron, molybdenum and copper inhibitaluminum nitride embrittlement. E Reference Radiographs for Heavy-Walled to 12 in. Historical Version s – view previous versions of standard.
The resulting etched specimen is compared with 10 reference macrographs. The Challenges of Chlor-Alkali Post: