ASME PTB-13:2021 pdf download

ASME PTB-13:2021 pdf download Cri teria for Pressu re Retai n in g M etal l i c Com pon en ts U si n g Ad d iti ve M an u factu ri n g
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(a)These criteria address the construction of pressure retaining component using the AM Powder Bed
Fusion process using both Laser and Electron Beam energy sources.
(b) Additively Manufactured components shall meet the requirements of the applicable ASME
Construction Code or Standard in addition to these criteria.
(c)Hybrid construction incorporating AM components joined (welded or brazed) to non-AM components
is acceptable. Additive manufactured components joined to other AM components or non-AMcomponents shall follow the requirements of the applicable ASME Construction Code or Standard.(d) The maximum design temperature shall be at least 50F(25°C) colder than the temperature where time-
dependent material properties begin to govern for the equivalent wrought ASME material specification,as indicated in ASME Section l1, Part D[1].
(e) The materials allowed for use in powder bed fusion under these criteria include:
(1) austenitic stainless-steel alloys; and
(2) nonferrous alloys
Commentary
The criteria provided in this Pressure Technology Book(PTB) address the construction of pressure retainingcomponents by means of the AM Powder Bed Fusion process (PBF) using both Laser and Electron Beamenergy sources.
When additively manufacturing components , these criteria are intended to be used with an existing ASMEConstruction Code or Standard. This PTB provides criteria to address the additional information necessaryto supplement construction code requirements for materials, design, fabrication, examination,inspection,testing and quality control. These supplementary criteria are essential for any proposed standard or codeaction for the construction of metallic pressure retaining components using powder bed fusion.
The AM process is not intended for the manufacture of pressure components when traditionalmanufacturing methods will provide a cost and efficiency advantage. AM has advantage in the fabricationof complex components and applications with high-cost materials. AM provides a cost advantage whensubtractive manufacturing processes result in large amounts of material waste. AM also provides scheduleadvantages and improved lead time compared to current forging and casting methods. A market for AM isdeveloping for replacement components in the nuclear industry where the plant operating basis requiresspecific replacement parts. AM provides a manufacturing method to fabricate components to the designcode of record when the original components are no longer available.These initial drivers for AM willrequire the installation of AM components into both existing systems and new construction.The criteriaallow hybrid construction incorporating AM components joined (welded or brazed) to non-AMcomponents.
The ASME AM Special Committee did not investigate data for AM components operating in the materialcreep regime.Creep data were discussed but sufficient material property data was not available to acceptAM components operating at elevated temperature in the scope of the current AM criteria. The maximumdesign temperature is limited to at least 50°F(25°C) colder than the temperature where time-dependentmaterial properties begin to govern for the equivalent wrought ASME material specification, as indicatedby the T-Notes in ASME Section II, Part D [1.
The current criteria limit the materials that can be used for the AM Powder bed fusion process to austenitic stainless steels and nonferrous alloys. Current toughness requirements in ASME Codes allow many exemptions to toughness testing that are experienced based. The restriction on the materials addresses concerns with the lack of service experience with additively manufactured components by limiting materials to alloys that do not have a marked ductile-brittle transition behavior.
2 ADDITIVE MANUFACTURING SPECIFICATION
(a) The Additive Manufacturer shall prepare an Additive Manufacturing Specification that provides all requirements and references to all construction documents for a component build including, but not limited to:
(1) The governing Construction Code or Standard
(2) The Design Report
(3) File names with current revision for all model data describing the geometry of the component needed to build the physical component
(4) The applicable Material Specification
(5) The Powder Specification
(6) The applicable ASME Construction Code or Standard Nondestructive Evaluation and Testing Requirements
(7) Post-Processing Requirements
(8) Thermal Treatment Requirements
(9) All supplemental requirements identified by the Additive Manufacturer or the user.