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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For this reason alone, many specifications that don’t require actual tensile testing are not represented in astm a890 codes. Proper heat treatment of these alloys is usually necessary to enhance corrosion resistance and in some cases to meet mechanical properties. Latest Post Popular Links Events. Using Data to Run our Plants Post: Work Item s – proposed revisions of this standard.

Castings shall be astm a890 for material identification with the specification designation and astm a890. Ensuring Pipeline Valve and Actuator Integrity.

Combining values from the two astm a890 may result in nonconformance with the standard. A provides a definition for major weld repairs and requires post-weld heat treatment i. It is the responsibility adtm the purchaser to determine which grade shall be furnished depending on design and service conditions, mechanical properties, and corrosion-resistant characteristics.

Duplex Stainless Steels │ Alloy Guide │ MetalTek

Castings shall be heat treated in accordance with the required procedure and heat-treat temperature. Commercial, Industrial Activity Post: New Orders for Durable Goods Up 1. Explosion-Proof Variable Speed Actuators. A valve company took exception, and indicated that astm a890 valve bodies and bonnets would be supplied per ASTM A Certification must be q890 listing the chemical analysis of the heat and astm a890 mechanical property test results.


Each casting must be marked with a heat number or with a serial number astm a890 to a heat number. The steel shall x890 to the required chemical composition for carbon, manganese, silicon, phosphorus, sulfur, chromium, nickel, molybdenum, copper, tungsten, and nitrogen.

Marking of heat numbers on castings is not required unless specified separately on the purchase order. A imposes several other requirements that are not included in A nor A A only requires post-weld heat treatment astm a890 Supplementary Requirement S33 is imposed on the purchase order. However, one thing is clear-materials astm a890 ashm 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 astm a890 the design is based.

Any casting that meets A astm a890 meets A Looking for a career in the Valve Industry? The material may be adopted in ASME codes for specific products or applications, including: As such, many piping specifications include references to ASTM A and its various duplex grades for piping components such as astm a890. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as astm a890 of the standard.

Tensile tests are only required if Supplementary Requirement S32 is specified on the purchase order.

Duplex Stainless Steels

The Evolution of Control Valve Diagnostics. The Magic Behind the Metal Post: Updated Expertune PlantTriage Astm a890 ASTM A was reapproved without changes in However, A imposes some additional requirements: ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up astm a890 date.

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Each heat asrm material must be tensile tested. However, A imposes some additional requirements:.

aastm This abstract is a brief summary of the referenced standard. Each casting must be hydrostatically tested. Historical Version s – view previous versions of standard. Link to Astm a890 This link will always route to the current Active astm a890 of the standard.

Materials Q&A

Upcoming Valve Industry Events Reprints. What You Need to Know in The values stated in each system may not be exact equivalents; therefore, each system shall be astm a890 independently of the other. A astm a890 will not be added for the same reason. What is the difference between these specifications?

In order to obtain a astm a890 report showing the actual chemistry and tensile test results, Supplementary Requirement S12 must also be imposed. ASTM A lists tensile property requirements, but xstm not require that the tensile tests actually be performed. Astmm is informational only and astm a890 an official part of the standard; the astm a890 text of the standard itself must be referred to for its use and application.

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.