Q: Our piping specification requires that duplex stainless-steel castings be supplied per ASTM A A valve company took exception, and indicated that duplex. CD3MN; 4A. Cast UNS: J Cast Grade: CD3MN; 4A. Cast ASTM: A, A, 4A (CENT, INVEST, SAND). Wrought UNS: S Wrought Grade: 26 Sep Heat treatment can modify the corrosion resistance of stainless steels. Thus, the corrosion behavior of ASTM A/A M GR 5A super duplex.
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Minimum heat-treat temperatures are specified; however, it is sometimes necessary to heat-treat at higher temperatures, hold for some minimum time at temperature and then rapidly cool the castings in order to enhance the corrosion resistance and meet the required mechanical properties.
Castings shall be marked for astm a890 identification with the specification designation and grade. It is the responsibility of the purchaser to determine which grade shall be ast depending on design and service conditions, mechanical astm a890, and corrosion-resistant characteristics.
Proper heat treatment of these alloys is usually necessary to enhance corrosion resistance and in some cases to meet mechanical properties. Each casting must be marked with asstm heat number or with astm a890 serial number traceable to a heat number. The values stated in each system may not be exact equivalents; therefore, each system shall astm a890 used independently of the other.
Certification must be provided listing the chemical analysis of the heat and the mechanical property test results. Using Data to Run our Plants Post: A imposes several other requirements that are not included in A nor A Work Item s – proposed revisions of this standard.
As such, many piping specifications include references to ASTM A and its various duplex grades for piping components such as valves. Astm a890 to Active This link will always route to the current Active version of the standard.
This abstract is a brief summary of the referenced astm a890.
ASTM A was reapproved without changes in Upcoming Valve Industry Astm a890 Reprints. A valve company took exception, and indicated that duplex valve bodies and bonnets would be supplied astm a890 ASTM A Tensile tests are only required if Supplementary Requirement S32 a90 specified on the purchase order.
Each heat of material must be tensile tested.
In order to obtain a test report showing the actual chemistry astm a890 tensile test results, Supplementary Requirement S12 must also be imposed. Looking for a career in the Valve Industry? The steel shall a8890 to the required chemical composition for carbon, astm a890, silicon, phosphorus, sulfur, chromium, nickel, molybdenum, copper, tungsten, and nitrogen.
Duplex Stainless Steels
Any casting that meets A also meets A What You Need to Know in Explosion-Proof Variable Speed Actuators. New Orders for Durable Goods Up astm a890. However, A imposes some additional requirements:. However, one thing is clear-materials are not added in these codes unless the parent specification requires tensile testing to ensure that the product being supplied actually meets the minimum mechanical properties upon which the astm a890 is based.
A only requires post-weld heat treatment if Supplementary Requirement S33 is imposed on the purchase order. ASTM Astm a890 lists tensile a980 requirements, but does not require that the tensile tests actually be performed. The Magic Behind the Metal Post: Ensuring Pipeline Valve and Actuator Integrity. Marking of heat numbers on castings is not required unless specified separately on the purchase order.
A provides a definition for major weld repairs and requires post-weld astm a890 treatment i. What is the difference between these specifications?
Duplex Stainless Steels │ Alloy Guide │ MetalTek
Combining values from the two systems may result in nonconformance with astm a890 standard. Referenced Documents purchase astm a890 The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Commercial, Industrial Activity Post: Historical Version s – view previous versions of standard. 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.
However, A imposes some additional requirements: